JP2013009556A - Voltage sensitivity measurement system, power device control system, terminal device, information processing device, and method and program of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a voltage sensitivity measurement system, a power device control system, a voltage sensitivity measurement method, a power device control method and a program, capable of acquiring voltage sensitivity with accuracy.SOLUTION: A voltage sensitivity measurement system comprises: modulation means executing modulation processing for modulating an active power or a reactive power of a modulated power device that is at least one of a plurality of power devices connected to a power system by using a modulation signal having a predetermined frequency; measurement means executing measurement processing for measuring a voltage component having the predetermined frequency that is included in voltage at an interconnection point between a measured power device that is at least one of the plurality of power devices and the power system as a modulation component; and calculation means calculating voltage sensitivity by using the modulation signal and the modulation component.

Description

  The present invention relates to a voltage sensitivity measurement system, a power device control system, a terminal device, an information processing device, a method thereof, and a program.

  In a power distribution system in which distributed power sources such as solar power generation are connected, instability such as an increase in voltage occurs as the distributed power sources increase.

  As a method of controlling the voltage, there is a method of changing the voltage of the distribution system by changing the active power P and the reactive power Q. In paragraph 0004 of Patent Document 1 and page 93 of Non-Patent Document 1, reactive power control is first performed as a measure for suppressing a voltage increase in a distribution system in which distributed power sources are connected, and reactive power control is performed. In some cases, a countermeasure for reducing the active power output when a sufficient suppression effect cannot be obtained is described.

  As described above, when control is performed to change the voltage of the distribution system by changing the active power P and the reactive power Q, it is necessary to correctly command the amount of change of the active power P and the reactive power Q. For this purpose, the ratio of the change amount of the voltage to the change amount of the active power P (active power voltage sensitivity) and the ratio of the change amount of the voltage to the change amount of the reactive power Q (reactive power voltage sensitivity) are acquired. is required.

  Patent Documents 2 and 3 describe techniques for stabilizing the voltage by changing the reactive power of the distributed power source. In this technique, the reactive power voltage sensitivity with respect to the voltage measurement point is used as a reference for determining which distributed power source Q to change the reactive power Q of.

  Patent Document 4 describes a technique for stabilizing the voltage by changing the active power and reactive power of the distributed power source. In this technique, active power voltage sensitivity and reactive power voltage sensitivity are used in determining the active power and reactive power of each distributed power source.

  There are two methods for acquiring active power voltage sensitivity and reactive power voltage sensitivity, and there are an acquisition method by calculation described in Patent Document 3 and an acquisition method by measurement shown in Patent Documents 1, 2, and 4.

  Regarding the method for obtaining the effective power voltage sensitivity and the reactive power voltage sensitivity by calculation, paragraphs 0021 and 0022 of Patent Document 3 describe a method of calculating the voltage sensitivity by simulation after specifying the system model.

  In order to implement the acquisition method by calculation described in Patent Document 3, it is necessary to assume that all the configurations in the power distribution system and the customer are known and that they are constant.

  However, there are many components in the power distribution system, and these components are connected in a complicated manner. For this reason, the power distribution system is very complex and difficult to grasp. Moreover, the equipment connected to the power distribution system including the load installed in the consumer is managed by each consumer. For this reason, it is difficult for the power distribution company to grasp the configuration in the consumer. Therefore, it is very difficult to obtain active power voltage sensitivity and reactive power voltage sensitivity by calculation.

  On the other hand, as an acquisition method that can be applied even when the configuration in the consumer cannot be accurately grasped, there is an acquisition method of active power voltage sensitivity and reactive power voltage sensitivity by measurement.

  In paragraphs 0052 to 0061 of Patent Document 1, the effective power output of the distributed power source is effective when it is intentionally changed for the purpose of measuring voltage sensitivity or when it is changed for other purposes. A technique is shown in which the amount of change in voltage corresponding to a change in power output is measured, and the amount of change in voltage is divided by the amount of change in effective power output to determine the effective power voltage sensitivity.

  Paragraph 0037 of Patent Document 2 shows a technique for obtaining reactive power voltage sensitivity by changing reactive power and measuring a change in voltage corresponding to the change in reactive power.

  In paragraph 0017 of Patent Document 4, the active power and the reactive power are individually changed, and the change in the voltage corresponding to each change in the active power and the reactive power is measured, whereby the active power voltage sensitivity and the reactive power voltage are measured. Techniques for determining sensitivity are shown.

Japanese Patent No. 4498247 JP 2010-074989 A JP 2009-153333 A Japanese Patent No. 4085045

NEC Association: Grid Connection Regulations (JEAC 9701-2010), 2010

  In order to implement the acquisition method by measurement shown in Patent Documents 1, 2, and 4, it is necessary to detect a voltage change corresponding to a change in specific active power or reactive power.

  However, a large number of devices are connected to the power distribution system, and they arbitrarily change the active power and reactive power, and they become noise and affect the target voltage change.

  An object of the present invention is to reduce the influence of noise, thereby accurately obtaining a voltage sensitivity, a voltage sensitivity measurement system, a power device control system, a terminal device, an information processing device, a voltage sensitivity measurement method, a power device control method, a voltage It is to provide a sensitivity measurement support method and program.

The voltage sensitivity measurement system of the present invention is
Modulation means for performing modulation processing for modulating active power or reactive power of a modulated power device, which is at least one of a plurality of power devices connected to the power system, using a modulation signal of a predetermined frequency;
Measuring means for performing a measurement process for measuring a voltage component of the predetermined frequency included in a voltage at a connection point between the measured power device as at least one of the plurality of power devices and the power system as a modulation component;
Calculating means for calculating voltage sensitivity using the modulation signal and the modulation component.

The terminal device of the present invention
When the information processing apparatus measures the voltage sensitivity, the modulated power device, which is at least one of a plurality of power devices connected to the power system, is enabled using a modulation signal having a predetermined frequency shared with the information processing device. Modulation means for performing modulation processing for modulating power or reactive power is included.

The terminal device of the present invention
A power device to be measured that shares a predetermined frequency with an information processing device that measures voltage sensitivity, and that is at least one of a plurality of power devices connected to a power system when the information processing device measures the voltage sensitivity; Measurement means for performing measurement processing for measuring the voltage component of the predetermined frequency included in the voltage at the connection point with the power system as a modulation component;
Communication means for outputting the modulation component measured by the measurement means to the information processing apparatus.

An information processing apparatus of the present invention is an information processing apparatus that shares a modulation signal of a predetermined frequency with a terminal apparatus that performs the modulation process, and shares the predetermined frequency with a terminal apparatus that executes the measurement process,
Receiving means for receiving a modulation component from a terminal device that executes the measurement process;
Calculating means for calculating voltage sensitivity using the modulated signal and the modulation component received by the receiving means.

The voltage sensitivity measurement method of the present invention is a voltage sensitivity measurement method performed by a voltage sensitivity measurement system,
A modulation step of performing modulation processing for modulating active power or reactive power of a modulated power device that is at least one of a plurality of power devices connected to the power system, using a modulation signal of a predetermined frequency;
A measurement step of performing a measurement process of measuring a voltage component of the predetermined frequency included in a voltage at a connection point between the power-under-measurement device that is at least one of the plurality of power devices and the power system as a modulation component;
Calculating a voltage sensitivity using the modulation signal and the modulation component.

The voltage sensitivity measurement support method of the present invention is a voltage sensitivity measurement support method performed by a terminal device,
When the information processing apparatus measures the voltage sensitivity, the modulated power device, which is at least one of a plurality of power devices connected to the power system, is enabled using a modulation signal having a predetermined frequency shared with the information processing device. It includes a modulation step for performing a modulation process for modulating power or reactive power.

The voltage sensitivity measurement support method of the present invention is a voltage sensitivity measurement support method performed by a terminal device,
A power device to be measured that shares a predetermined frequency with an information processing device that measures voltage sensitivity, and that is at least one of a plurality of power devices connected to a power system when the information processing device measures the voltage sensitivity; A measurement step of performing a measurement process of measuring a voltage component of the predetermined frequency included in a voltage at a connection point with the power system as a modulation component;
And a communication step of outputting the modulation component to the information processing apparatus.

The voltage sensitivity measurement method of the present invention shares a modulation signal of a predetermined frequency with a terminal device that executes the modulation processing, and performs voltage sensitivity measurement performed by an information processing device that shares the predetermined frequency with the terminal device that executes the measurement processing. A method,
An accepting step of receiving a modulation component from a terminal device that executes the modulation process;
Calculating a voltage sensitivity using the modulation signal and the modulation component.

The program of the present invention is stored in a computer.
A modulation procedure for performing modulation processing for modulating active power or reactive power of a modulated power device that is at least one of a plurality of power devices connected to the power system, using a modulation signal of a predetermined frequency;
A measurement procedure for performing a measurement process for measuring a voltage component of the predetermined frequency included in a voltage at a connection point between the power device to be measured that is at least one of the plurality of power devices and the power system as a modulation component;
And a calculation procedure for calculating voltage sensitivity using the modulation signal and the modulation component.

  According to the present invention, it is possible to acquire voltage sensitivity with high accuracy by reducing the influence of noise when acquiring active power voltage sensitivity or reactive power voltage sensitivity.

It is the figure which showed the electric power system containing the electric power apparatus control system of one Embodiment of this invention. It is the block diagram which showed the customer side system. 3 is a block diagram showing an information processing apparatus 4. FIG. It is the block diagram which showed the voltage change measurement part 6ca. It is the figure which showed the example which took out a part of time change of the voltage measured with the voltage measuring device 6aA. It is a diagram showing a sine wave signal of frequency f _0. FIG. 6 is a schematic diagram of the voltage measured by the voltage measuring device 6aA shown in FIG. 5 expressed as a spectrum with the horizontal axis as the frequency. It is the figure which showed the example of the spectrum after passing the spectrum of the measured voltage shown in FIG. 7 through a band pass filter. It is the figure which showed the example of the spectrum after passing the spectrum of the measured voltage shown in FIG. 7 through a band pass filter. It is the figure which showed the time change of the voltage measured when a bandwidth is wide. It is the figure which showed the time change of the voltage measured when a bandwidth is narrow. It is the figure which showed voltage change calculation part 6ca2. It is a flowchart for demonstrating operation | movement of the modulation signal generation apparatus management part 4f. It is a flowchart for demonstrating operation | movement of the voltage change measuring device management part 4e. 1 is a diagram showing a voltage sensitivity measurement system including a modulation unit 61, a measurement unit 62, and an information processing device 4. FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a power system including a power device control system according to an embodiment of the present invention.

  In FIG. 1, the power system includes a distribution substation 1, pole transformers 21 to 24, an SVR (Step Voltage Regulator) 3, an information processing device 4, and a control command device 5. The customer side systems 601 to 616 and the communication network 7 are included. In FIG. 1, the customer side system is simply indicated as “customer”.

  FIG. 2 is a block diagram showing the customer side system 6 used as each of the customer side systems 601 to 616.

  In FIG. 2, the customer side system 6 includes a voltage measuring device 6a, a reference signal generating device 6b, a voltage change measuring device 6c, modulated signal generating devices 6d1 and 6d2, modulated devices 6e1 and 6e2, and a communication device. 6f and other power equipment 6g. The voltage change measuring device 6c includes voltage change measuring units 6c1 to 6cN. “N” is an integer of 1 or more. The modulation signal generation devices 6d1 and 6d2 are included in the modulation unit 61 which is an example of a modulation unit. The voltage measuring device 6a and the voltage change measuring device 6c are included in the measuring unit 62 which is an example of a measuring unit. The communication device 6f is an example of a communication unit. In the customer side system 6, a device including the modulation unit 61 (for example, the modulation unit 61 itself) is an example of a terminal device, and a device including the measurement unit 62 and the communication device 6f is an example of a terminal device.

  FIG. 3 is a block diagram illustrating an information processing apparatus 4 that is an example of a calculation unit.

  In FIG. 3, the information processing device 4 includes a communication device 4 a that is an example of a reception unit, a conversion coefficient recording device 4 b, a modulation amplitude recording device 4 c, a voltage sensitivity recording device 4 d, and a voltage change measuring device management unit 4 e. A modulation signal generation device management unit 4f and a sensitivity calculation unit 4g. The conversion coefficient recording device 4b, the modulation amplitude recording device 4c, the voltage sensitivity recording device 4d, the voltage change measurement device management unit 4e, the modulation signal generation device management unit 4f, and the sensitivity calculation unit 4g constitute a calculation means.

  The power device control system according to the embodiment of the present invention includes an information processing device 4, a control command device 5, a voltage measuring device 6a, a reference signal generating device 6b, modulation signal generating devices 6d1 and 6d2, and a voltage change measurement. It includes a device 6c, a communication device 6f, and modulated devices 6e1 and 6e2.

  In addition, although these apparatuses are written separately for convenience, they may be incorporated in other apparatuses or a plurality of functions may be incorporated in the same apparatus. For example, the voltage meter 6a may be built in the smart meter, the voltage meter 6a, the reference signal generator 6b, the modulation signal generators 6d1 and 6d2, the voltage change measuring device 6c, and the communication device 6f. One or more of these devices may be incorporated in the modulated device 6e1 or 6e2.

  The voltage measuring device 6a has a function of measuring the voltage value of the power system. In this embodiment, the voltage measuring device 6a measures the voltage value of the interconnection point 6h between the power system and the modulated devices 6e1 and 6e2. The voltage value output from the voltage measuring device 6a is the amplitude of the voltage at the connection point 6h or the effective value of the voltage at the connection point 6h.

  Reference signal generating device 6b can be generally referred to as reference signal generating means.

  The reference signal generator 6b generates a reference signal (hereinafter referred to as “reference signal”) when the modulation signal generator 6d (6d1 and 6d2) performs modulation and the voltage change measurement device 6c performs measurement. . Each reference signal generator 6b in each customer system generates a signal (reference signal) having the same frequency in any customer system.

  As an example of a method for generating the reference signal by the reference signal generator 6b, in FIG. 2, the reference signal generator 6b has a frequency of about 50 Hz or about 60 Hz, which is the frequency of the AC voltage in the power system, from the voltage measuring device 6a. A waveform is acquired, a sine wave is generated by correcting disturbances and amplitudes of the waveform, and the sine wave is output as a reference signal. This reference signal has the frequency of the AC voltage in the power system.

  As an example of a method for generating the reference signal by the reference signal generating device 6b, the reference signal generating device 6b can generate the reference signal from the AC voltage of the power system. A method for generating a reference signal in synchronization with other customer systems using a GPS, or a method for generating a reference signal using time information of GPS using a GPS (Global Positioning System) receiver (not shown) and so on.

  Modulation signal generation devices 6d1 and 6d2 generate modulation signals to be applied to active power and reactive power, with reference to the reference signal. The modulation signal generation device 6d1 outputs the modulation signal to the modulated device 6e1, and the modulation signal generation device 6d2 outputs the modulation signal to the modulation device 6e2.

  The modulation signal indicates the amplitude and frequency of modulation applied to active power and reactive power.

  The modulation signal generation devices 6d1 and 6d2 obtain the modulation amplitude from the information processing device 4 via the communication device 6f.

  The modulation signal generation devices 6d1 and 6d2 generate the modulation frequency based on the reference signal by a generation method shared between the information processing device 4 and the modulation signal generation devices 6d1 and 6d2.

  As this generation method, for example, the reference signal is a sine wave of about 50 Hz or 60 Hz, and the frequency obtained by dividing the frequency of the sine wave as the reference signal by a certain conversion coefficient is generated as the frequency of the modulation signal. There is a generation method.

  The conversion coefficient is uniquely generated by the information processing device 4 for each modulation signal generation device and transmitted to the modulation signal generation devices 6d1 and 6d2. In this case, the information processing device 4 generates a different conversion coefficient for each modulation signal generation device.

  Also, if the modulation signal generator itself has a unique number and it is guaranteed that the number is different from other modulation signal generation devices (for example, a random number with a large number of digits or a serial number), the unique number There is also a method of using it as a conversion coefficient. However, since the information processing device 4 needs to know the conversion coefficients of all the modulation signal generation devices for the reason described later, each modulation signal generation device has its conversion coefficients generated by itself. It is necessary to transmit (number) to the information processing device 4 and share the value of the conversion coefficient (number) between the information processing device 4 and the modulation signal generation devices 6d1 and 6d2.

  Note that the method of generating the modulation signal from the reference signal does not have to be a method of generating a sine wave having a frequency obtained by dividing the frequency of the reference signal by a certain number (conversion coefficient). Any original signal may be used. However, the algorithm has parameters, and the parameters are shared between the information processing device 4 and each of the modulation signal generation devices 6d1 and 6d2. If the parameters are different, the generated reference signal has a different frequency and one cycle. It is desirable that the integral value of the modulation amount is zero. The reason why it is desirable to have a waveform in which the integral value of the modulation amount in one period is 0 is to cancel out the fluctuation amount of the output amount of active power or reactive power due to the modulation signal within one cycle. .

  In the following, in order to simplify the description, as described above, the information processing device 4 generates a conversion coefficient, and the modulation signal generation devices 6d1 and 6d2 use the conversion coefficients given from the information processing device 4 to convert the reference signal. A sine wave having a frequency divided by the frequency is generated as a reference signal.

  Each of the modulated devices 6e1 and 6e2 is an example of a modulated power device and an example of a measured power device.

  The modulated devices 6e1 and 6e2 are power devices such as a power generation device, a power storage device, or a load device, and also have a function of changing the output amount of active power or reactive power according to a modulation signal from the outside. Alternatively, the modulated devices 6e1 and 6e2 are devices that are installed for voltage sensitivity measurement, which is the purpose of the power device control system, and have a function of changing the output amount of active power or reactive power at least according to a modulation signal from the outside. There can be.

  In FIG. 2, there are two modulated devices 6e, a modulated device 6e1 that changes the output amount of active power and a modulated device 6e2 that changes the output amount of reactive power. There may be cases where both are modulated, and there may be only a modulated device that modulates one of the active power and reactive power. Note that the magnitude of the modulation is sufficiently smaller than the power consumption amount or generated power amount when each device is originally used.

  An example of a specific method in which each modulated device 6e performs modulation according to the modulation signal is as follows.

  As an example of changing the output of the active power, there is a method in which each modulated device 6e modulates the active power by periodically charging and discharging according to a modulation signal. However, in this case, if the modulated device 6e is a device that originally does not have a storage battery, such as a power generation device or a load device, a storage battery or a capacitor that stores power for one period of modulation inside the modulated device 6e. It is necessary to provide a device.

  As another example of changing the output of the active power, there is a method of reducing or increasing the amount of power generation according to the modulation signal for the power generation device, and repeatedly turning on / off the load device according to the modulation signal. is there. In particular, when the modulated device 6e is a solar power generation device, it is possible to modulate the power generation amount by periodically changing the input impedance of the power conditioner to which the solar power generation panel is connected in accordance with the modulation signal. is there.

  As a method of modulating the output of the reactive power of each modulated device 6e, when the modulated device 6e includes an inverter, the reactive power can be changed by periodically changing the phase of the output current in accordance with the modulation signal. The amount can be modulated.

  The information processing device 4 manages the modulation signal generation device 6d and the voltage change measurement device 6c that exist in all customer-side systems within a certain range, for example, the same distribution substation 1 or lower.

  In FIG. 3, when the modulation signal generation device 6d generates a conversion coefficient when the modulation signal generation device 6d is newly linked, the modulation signal generation device management unit 4f modulates the value (conversion coefficient). It has a function of acquiring from the signal generating device 6d and storing it in the conversion coefficient recording device 4b.

  In the present embodiment, when the modulation signal generation device 6d is newly linked, the modulation signal generation device management unit 4f generates a unique conversion coefficient for the modulation signal generation device 6d and modulates the conversion coefficient to the modulation signal generation device 6d. The signal generation device 6d is notified and stored in the conversion coefficient recording device 4b.

  Further, when the modulation signal generation device 6d is newly linked, the modulation signal generation device management unit 4f sets an amplitude for the modulation signal generation device 6d and notifies the modulation signal generation device 6d of the amplitude. At the same time, it is stored in the modulation amplitude recording device 4c.

  When the voltage change measurement device 6c is newly linked, the voltage change measurement device management unit 4e refers to the conversion coefficient recording device 4b, and the voltage change measurement device 6c has a total demand within a certain range. Distribute the conversion coefficients of all the modulation signal generation devices 6d in the home system.

  In addition, when the modulation signal generation device 6d is newly linked, the voltage change measurement device management unit 4e refers to the conversion coefficient recording device 4b and sets the conversion coefficient of the modulation signal generation device 6d within a certain range. Are distributed to the voltage change measuring device 6c in all customer-side systems.

  The sensitivity calculation unit 4g communicates with each voltage change measurement unit 6c1 to 6cN of each voltage change measurement device 6c to obtain a voltage change, and obtains a modulation amplitude of active power or reactive power for each frequency of the modulation signal. The voltage sensitivity is derived by dividing by the voltage change. The sensitivity calculation unit 4g acquires the modulation amplitude of active power or reactive power from the modulation amplitude recording device 4c. The sensitivity calculation unit 4g records the obtained voltage sensitivity in the voltage sensitivity recording device 4d.

  The voltage sensitivity in the voltage sensitivity recording device 4d is used when the control command device 5 performs some control, for example, the voltage control disclosed in Patent Documents 1 to 4.

  FIG. 3 shows an example of voltage sensitivity recorded in the voltage sensitivity recording device 4d.

In the example shown in FIG. 3, there are N customers (N customer-side systems 6), and all customers (all customer-side systems 6) modulate active power and reactive power, respectively. This is an example in which the modulation signal generation devices 6d1 and 6d2 for applying are provided, and each door (each customer side system 6) has a voltage change measurement device 6c, and 2N modulation signal generation devices 6d and N The voltage sensitivity of the product 2N ² of the voltage change measuring device 6c is stored.

  In FIG. 2, the voltage change measuring device 6c includes a plurality of voltage change measuring units 6c1 to 6cN.

  FIG. 4 is a block diagram showing the voltage change measuring unit 6ca used as each of the voltage change measuring units 6c1 to 6cN.

  The voltage change measurement unit 6ca includes a modulation signal generation unit 6ca1 and a voltage change calculation unit 6ca2.

  The voltage change measuring unit 6ca is required by the number of modulation signal generation devices 6d existing within a certain range, for example, below the same distribution substation 1, and the modulation signal generation devices 6d are connected and disconnected. , Its required number varies. Therefore, when the voltage change measuring units 6ca are configured by independent circuits, a sufficient number of voltage change measuring units 6ca are prepared in advance. When the voltage change measurement unit 6ca is configured by software, each voltage change measurement unit 6ca is an independent process, and the modulation signal generation device 6d is connected and disconnected by communication with the information processing device 4. Dynamically increases or decreases the number of processes of the voltage change measuring unit 6ca.

  In the present embodiment, the voltage change measurement unit 6ca has a one-to-one correspondence with the modulation signal generation device 6d.

  The voltage change measuring device 6c acquires the conversion coefficients of all the modulation signal generation devices 6d via the communication device 6f, and provides the conversion coefficients to the respective modulation signal generation units 6ca1.

  The modulation signal generation unit 6ca1 generates a modulation signal from the conversion coefficient and the reference signal by the same algorithm as that of the modulation signal generation device 6d.

  The voltage change calculation unit 6ca2 extracts the component of the modulation signal in the voltage value based on the voltage value measured by the voltage measuring device 6a and the modulation signal, calculates the magnitude thereof, and calculates the calculation result. This is transmitted to the sensitivity calculation unit 4g of the information processing device 4 via the communication device 6f.

  The communication devices 6f and 4a (see FIGS. 2 and 3) exchange information between the modulation signal generation device 6d, the voltage change measurement device 6c, and the information processing device 4 via the communication network 7.

  The communication network 7 includes general communication means such as the Internet, Wi-Fi, a mobile phone network, and PLC (Power Line Communication), and an end device thereof.

  Control command device 5 can be generally referred to as control means.

  The control command device 5 controls the active power amount and reactive power amount of the modulated device 6e based on the voltage sensitivity in the voltage sensitivity recording device 4d so that the voltage of the power system is stabilized.

  Next, an example of a method of measuring the voltage change corresponding to the modulation by eliminating the influence of noise in the voltage change calculation unit 6ca2 shown in FIG.

  A modulated device (hereinafter referred to as “modulated device 6eA”) modulates the output of active power or reactive power, and the voltage measured by a certain voltage measuring device (hereinafter referred to as “voltage measuring device 6aA”) A case will be described in which a voltage change calculation unit (hereinafter referred to as “voltage change calculation unit 6ca2A”) in the voltage change measurement unit in the voltage change measurement unit detects a voltage change corresponding to the modulation. .

The modulated device 6eA modulates the output of active power or reactive power with a sine wave and sets the frequency of the sine wave to f ₀ .

  FIG. 5 is a diagram showing an example in which a part of the time change of the voltage measured by the voltage measuring instrument 6aA is taken out.

The time change of the voltage shown in FIG. 5 includes the sine wave signal having the frequency f ₀ shown in FIG. However, as can be seen from FIG. 5, since there is a lot of noise, it is difficult to take out a sine wave signal of frequency f ₀ from the time variation of the voltage shown in FIG. 5 and measure the amplitude or effective voltage. It is. This noise is caused by changes in demand and power generation, modulation by other modulated devices, and the like.

  The inability to identify the modulated signal here can be explained as follows.

  FIG. 7 is a schematic diagram of the voltage measured by the voltage measuring instrument 6aA shown in FIG.

In FIG. 7, it is clear that there is a peak at the frequency f ₀ and there is a sinusoidal signal at the frequency f ₀ . However, the area of the signal of frequency f ₀ in FIG. 7 is very small compared to the sum of the noise areas of other frequencies. The magnitude of the voltage actually measured is proportional to the area of the spectrum. Therefore, in this case, since the noise area is larger than the signal area on the spectrum, the signal modulated by the sine wave of frequency f ₀ is buried in the noise as shown in FIG.

  Therefore, as a method for extracting a signal, there is a method using a band pass filter.

The band pass filter passes only a voltage change of a frequency in a specific band. Thus, the time variation of the voltage measured as shown in FIG. 5, left By passing a band-pass filter centered on the frequency f _0, unchanged magnitude of the target frequency f ₀ of the sine wave modulated signal Thus, noise passing through the band pass filter can be reduced, and a signal modulated with a sine wave having the frequency f ₀ can be extracted with higher accuracy.

  FIG. 8 and FIG. 9 are diagrams showing an example of the spectrum after the spectrum of the measured voltage shown in FIG. 7 is passed through the band-pass filter.

  8 shows an example of a spectrum after passing through a bandpass filter having a wide bandwidth, and FIG. 9 shows an example of a spectrum after passing through a bandpass filter having a narrower bandwidth than the bandpass filter used in FIG.

  Since the ratio of noise to signal size when performing measurement can be expressed by the ratio of noise to signal area on the spectrum, the bandwidth is narrower (FIG. 8) than when the bandwidth is wide (FIG. 8). It can be said that the ratio of the signal to noise becomes larger, and the signal can be easily extracted.

  FIG. 10 and FIG. 11 are diagrams showing the time change of the voltage measured when the bandwidth is wide (FIG. 8) and when the bandwidth is narrow (FIG. 9), respectively.

In the case where the bandwidth shown in FIG. 10 is wide, it is still difficult to measure the intensity by finding a sine wave signal of frequency f ₀ . On the other hand, when the bandwidth shown in FIG. 11 narrow, it is easy to find a sinusoidal signal of frequency f _0, from the voltage changes including noise shown in FIG. 5, the signal of the frequency f ₀ It can be said that measurement was possible. In other words, it is possible to suppress noise by passing through a bandpass filter with a bandwidth centered on the frequency of the target signal, and the effect of reducing noise is the smaller the bandwidth, and if the bandwidth is narrow It can be said that the narrower the noise can be reduced.

  The voltage change calculation unit 6ca2A reduces noise through a bandpass filter having a narrow bandwidth centered on the reference signal, and detects the magnitude of the modulated voltage change. Specific methods include the following methods.

  The modulation signal generated by the modulation signal generator 6ca1 from the reference signal and the conversion coefficient is

And Fourier expand the signal measured by the voltage measuring instrument 6aA,

It can be expressed as Note that f ₁ , f ₂ , f ₃ ... Are all different values. Here, the signal obtained by rotating the phase of the signal V _RS (t)

And the signal V _RS (t) and the signal V _RC (t) multiplied by the signal V _MES (t) are the signal α (t) and the signal β (t), respectively, and the signal α (t), The signal β (t) can be expressed as follows.

Here, the signal alpha (t), By signal beta (t) the cutoff frequency through a sufficiently low pass filter than f _0, term that varies in frequency in Σ (f _k + f ₀₎ 0 It becomes. Furthermore, if the cut-off frequency of the low-pass filter is sufficiently low, the terms that change with the frequency (f _k −f ₀ ) are also zero except for the term f _k ≠ f ₀ . As a result, when f _n = f ₀ and the signal α (t) and the signal β (t) are applied to the low-pass filter are the signal α ′ (t) and the signal β ′ (t), respectively,

Next, the A _n is the fluctuation component of the frequency f ₀ in the signal V _MES (t) can be extracted.

The merit of this method is that noise can be reduced by lowering the cut-off frequency of the low-pass filter instead of narrowing the band-pass filter band by converting the fluctuation component at the frequency f ₀ to DC. It is. Lowering the cut-off frequency of the low-pass filter is equivalent to increasing the time for taking the time average. Therefore, it is possible to reduce the noise to an arbitrary level simply by taking a time average until the noise falls below a required level.

  FIG. 12 is a diagram illustrating the voltage change calculation unit 6ca2.

  Voltage change calculation unit 6ca2 includes a phase shifter 1201, integrators 1202 and 1203, low-pass filters 1204 and 1205, and a measurement unit 1206.

The phase shifter 1201 outputs a signal V _RC (t) obtained by shifting the modulation signal V _RS (t) by 90 degrees. The integrator 1202 integrates the input signal V _MES (t) with the modulation signal V _RS (t) and outputs a signal α (t). The integrator 1203 integrates the input signal V _MES (t) with the signal V _RC (t) and outputs a signal β (t). The low-pass filter 1204 extracts a DC component signal α ′ (t) from the signal α (t). The low-pass filter 1205 extracts a DC component signal β ′ (t) from the signal β (t). Measuring unit 1206 measures the voltage variation A _n using signals alpha '(t) and signal beta' and (t).

  Note that by performing time averaging when measuring the voltage in the measurement unit 1206, an effect equivalent to lowering the cutoff frequency of the low-pass filters 1204 and 1205 can be obtained. The voltage change calculation unit 6ca2 can be implemented by a circuit, but the process performed by the voltage change calculation unit 6ca2 is about phase shift and multiplication, and the voltage change calculation unit 6ca2 can be easily implemented on software.

  In this system, a plurality of modulated devices perform output modulation simultaneously with a modulation signal, and a plurality of voltage change measuring units in each voltage change measuring device simultaneously measure voltage changes caused by different modulations, Achieves faster measurement time.

  This is because the frequency of the modulation signal is changed for each modulated device, the modulation frequency is transmitted to each voltage change measurement unit, and signals other than the modulation frequency that each voltage change measurement unit wants to measure are eliminated by a relatively easy method. Because you can do it.

If the modulation frequency and the measurement frequency at each voltage change measurement unit are slightly shifted, the term of the frequency (f _k −f ₀ ) in Equations 4 and 5 is not 0, and therefore changes over time. Therefore, in order to realize the measurement method shown here, a mechanism for sharing a completely matched modulation signal is required as in this system.

  In addition, in order to measure voltage changes caused by a plurality of modulations at the same time, a mechanism for easily eliminating signals other than the modulation frequency is required. Also in this respect, the method shown here can be realized by a simple method that can be easily implemented on software.

  The modulation frequency is preferably a low frequency sufficiently separated from the system frequency 50 Hz or 60 Hz. This is because there is a very large peak at the system frequency 50 Hz or 60 Hz, and it is difficult to eliminate the influence of the system frequency 50 Hz or 60 Hz when modulation is performed in the vicinity thereof.

  Next, the operation will be described.

  FIG. 13 is a flowchart for explaining the operation of the modulation signal generation device management unit 4 f in the information processing device 4.

  The modulation signal generation device management unit 4f first determines whether the new modulation signal generation device 6d is linked (step S101). If the new modulation signal generation device 6d is not linked, the existing modulation signal generation device 6d It is determined whether the modulation signal generating device 6d has been disconnected (step S102).

  As a method for the modulation signal generation device management unit 4f to detect linkage / disconnection of the modulation signal generation device 6d, for example, the modulation signal generation device management unit 4f notifies the modulation signal generation device management unit 4f that the modulation signal generation device 6d is regularly linked. There are ways to communicate.

  When a newly linked modulation signal generation device 6d is detected (step S101), the modulation signal generation device management unit 4f acquires a conversion coefficient assigned to the existing modulation signal generation device 6d from the conversion coefficient recording device 4b. (Step S103), a conversion coefficient different from the acquired conversion coefficient, that is, a conversion coefficient not assigned to the existing modulation signal generating device 6d is created (Step S104).

  Subsequently, the modulation signal generation device management unit 4f assigns the conversion coefficient created in step S104 to the newly linked modulation signal generation device 6d, and notifies the newly linked modulation signal generation device 6d. At the same time (step S105), the conversion coefficient is recorded in the conversion coefficient recording device 4b (step S106).

  As a method for creating and assigning a conversion coefficient, a random number is generated, and it is confirmed that the random number is not assigned to the existing modulation signal generation apparatus 6d or assigned, or among the conversion coefficients assigned to the existing modulation signal generation apparatus 6d There are methods such as assigning a maximum number plus a certain number.

  Subsequently, the modulation signal generation device management unit 4f allows the modulated device 6e connected to the newly linked modulation signal generation device 6d to have a range of active power or reactive power that can be varied by external control. Is obtained from the newly linked modulated signal generating device 6d (step S107), and the amplitude of the modulation is determined within a range that does not affect the original function of the modulated device 6e (step S107). S108).

  Subsequently, the modulation signal generation device management unit 4f notifies the modulation signal generation device 6d newly linked to the modulation amplitude determined in step S108 (step S109), and the modulation amplitude is recorded in the modulation amplitude recording device 4c. (Step S110), and then the process returns to step S101.

  Also, in the event that a separation of the modulation signal generation device 6d is detected in step S102, the modulation signal generation device management unit 4f deletes the information on the modulation signal generation device from the conversion coefficient recording device 4b and the modulation amplitude recording device 4c. (Step S111), and then returns to Step S101.

  On the other hand, when the separation of the modulation signal generation device 6d is not detected in step S102, the modulation signal generation device management unit 4f returns to step S101.

  FIG. 14 is a flowchart for explaining the operation of the voltage change measuring device management unit 4 e in the information processing device 4.

  The voltage change measuring device management unit 4e first determines whether or not the new voltage change measuring device 6c is linked (step S201). If the new voltage change measuring device 6c is linked, the existing modulation is measured. The conversion coefficient assigned to the signal generation device is acquired from the conversion coefficient recording device 4b (step S202), and the acquired list of conversion coefficients is sent to the voltage change measurement device 6c (step S203), and then the process returns to step S201. .

  As a method for the voltage change measurement device management unit 4e to detect the connection of the voltage change measurement device 6c, for example, the voltage change measurement device 6c is provided with a function of notifying the voltage change measurement device management unit 4e that the connection has been made. , Etc.

  If the new voltage change measurement device 6c is not linked in step S201, the voltage change measurement device management unit 4e determines whether the new modulation signal generation device 6d is linked (step S204).

  When the new modulation signal generation device 6d is linked in step S204, the voltage change measurement device management unit 4e acquires the conversion coefficient of the new modulation signal generation device 6d from the conversion coefficient recording device 4b (step S205). The conversion coefficient is transmitted to all the voltage change measuring devices 6c (step S206), and then the process returns to step S201.

  If the new modulation signal generation device 6d is not linked in step S204, the voltage change measurement device management unit 4e determines whether the existing modulation signal generation device 6d has been disconnected (step S207).

  The voltage change measurement device management unit 4e monitors the change of the conversion coefficient recording device 4b, which is notified from the modulation signal generation device management unit 4f as a method for detecting the connection and disconnection of the modulation signal generation device 6d. There is.

  When the existing modulated signal generating device 6d is disconnected in step S207, the voltage change measuring device managing unit 4e outputs the signal modulated by the disconnected modulated signal generating device 6d to all the voltage change measuring devices 6c. Is stopped (step S208).

  Next, operation | movement of a customer side system is demonstrated using FIG.

  The voltage measuring instrument 6a measures the voltage value of the power system and outputs the measurement result to the reference signal generator 6b and the voltage change measuring device 6c.

  The reference signal generator 6b generates a sine wave reference signal of about 50 Hz or about 60 Hz, which is the frequency of the AC voltage in the power system, using the measurement result of the voltage measuring device 6a, and converts the reference signal into a modulation signal. It outputs to the production | generation apparatus 6d and the voltage change measurement apparatus 6c.

  The modulation signal generation device 6d uses a sine wave having a frequency obtained by dividing the frequency of the reference signal by the conversion coefficient received from the information processing device 4 and having an amplitude instructed from the information processing device 4 as a modulation signal. It generates and modulates the active power or reactive power of the modulated device 6e using the modulated signal.

  On the other hand, the modulation signal generation unit 6ca1 in the voltage change measurement unit generates a modulation signal from the conversion coefficient received from the information processing device 4 and the reference signal by the same algorithm as the modulation signal generation device 6d. The voltage change calculation unit 6ca2 extracts the component of the modulation signal in the voltage value based on the voltage value measured by the voltage measuring device 6a and the modulation signal, calculates the magnitude thereof, and calculates the calculation result. This is transmitted to the sensitivity calculation unit 4g of the information processing device 4.

  Next, the operation of the sensitivity calculation unit 4g in the information processing apparatus 4 will be described.

  The sensitivity calculation unit 4g acquires a voltage change from each of the voltage change measurement units 6c1 to 6cN of each voltage change measurement device 6c, and calculates the modulation amplitude of the active power or the reactive power for each frequency of the modulation signal with the acquired voltage change. Divide to derive voltage sensitivity. The sensitivity calculation unit 4g records the obtained voltage sensitivity in the voltage sensitivity recording device 4d.

  Next, the operation of the control command device 5 will be described.

  For example, as described in Patent Literature 1, 2, 3, or 4, the control command device 5 is configured to modulate the modulated device based on the voltage sensitivity in the voltage sensitivity recording device 4d so that the voltage of the power system is stabilized. The active power amount and reactive power amount of 6e are controlled.

  According to the present embodiment, the modulation unit 61 modulates the active power or reactive power of the modulated device that is at least one of the plurality of power devices connected to the power system, using the modulation signal of the predetermined frequency. Execute the process. The measurement unit 62 measures the voltage component of a predetermined frequency included in the voltage at the connection point between the power device under measurement that is at least one of a plurality of power devices connected to the power system and the power system as a modulation component. Execute the process. The information processing device 4 calculates the voltage sensitivity of the power device under measurement using the modulation signal of a predetermined frequency and the modulation component (voltage component of the predetermined frequency).

  In the present embodiment, since the voltage sensitivity of the power device to be measured is calculated using the modulation signal of the predetermined frequency and the voltage component of the predetermined frequency, the influence of the noise component is reduced, and thus the voltage sensitivity is obtained with high accuracy. Is possible. This effect is also exhibited by a voltage sensitivity measurement system including the modulation unit 61, the measurement unit 62, and the information processing device 4. FIG. 15 is a diagram illustrating a voltage sensitivity measurement system including the modulation unit 61, the measurement unit 62, and the information processing device 4.

  Further, in the present embodiment, there are a plurality of modulated devices 6e, and the modulation unit 61 generates a plurality of modulated signals corresponding to the modulated devices 6e on a one-to-one basis, and for each modulated device 6e, each modulated device The active power or reactive power of 6e is modulated using the modulation signal corresponding to the modulated device 6e, and the plurality of modulation signals have different frequencies. Further, the measuring unit 62 measures each voltage component having a different frequency included in the voltage at the interconnection point as a modulation component. The information processing device 4 calculates the voltage sensitivity using the modulation signal and the modulation component for each frequency.

  In this case, a plurality of voltage sensitivities can be measured simultaneously, and the measurement time can be shortened as compared with the case where the voltage sensitivities are individually measured.

  In the present embodiment, the reference signal generator 6b generates a reference signal, the modulation unit 61 performs modulation processing with reference to the reference signal, and the measurement unit 62 performs measurement processing with reference to the reference signal. To do.

  In this case, the modulation process and the measurement process can be synchronized. Note that the reference signal generator 6b generates a reference signal synchronized with the frequency of the power of the power system, for example.

  In the present embodiment, the control command device 5 controls the modulated device 6e based on the voltage sensitivity calculated by the voltage sensitivity measurement system.

  In this case, since the modulated device 6e can be controlled using accurate voltage sensitivity, the modulated device 6e can be controlled with high accuracy.

  In addition, in the said embodiment, all the customer side systems are measuring voltage sensitivity, However, Only some customer side systems among several customer side systems may measure voltage sensitivity.

  In addition, when power modulation and voltage measurement are performed by only one customer side system, the information processing apparatus 4 may be included in the customer side system. In this case, the processing of the customer side system including the information processing apparatus 4 is recorded on a computer-readable recording medium in addition to the above-described dedicated hardware. The program may be executed by a computer that reads and executes the program recorded on the recording medium. The computer-readable recording medium includes a transferable recording medium such as a flexible disk, a magneto-optical disk, a DVD (Digital Versatile Disk), and a CD (Compact Disc), as well as an HDD (Hard) built in the input control device. Disk drive).

  Moreover, in the said embodiment, although the modulation | alteration of electric power and the measurement of a voltage are performed in a consumer side system, the modulation | alteration of electric power and the measurement of a voltage are systems other than a consumer side system, for example, systems, such as a power generation company You may go on. In this case, systems other than the customer side system have the same functions as the customer side system.

  In the embodiment described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

1 Power distribution substation 21-24 Transformer on pole 3 SVR
4 Information Processing Device 4a Communication Device 4b Conversion Coefficient Recording Device 4c Modulation Amplitude Recording Device 4d Voltage Sensitivity Recording Device 4e Voltage Change Measurement Device Management Unit 4f Modulation Signal Generation Device Management Unit 4g Sensitivity Calculation Unit 5 Control Command Device 6, 601-616 Demand Home System 61 Modulation Unit 62 Measurement Unit 6a Voltage Measurement Unit 6b Reference Signal Generator 6c Voltage Change Measurement Device 6c1-6cN, 6ca Voltage Change Measurement Unit 6ca1 Modulation Signal Generation Unit 6ca2 Voltage Change Calculation Unit 6d1-6d2 Modulation Signal Generation Device 6e1 -6e2 Modulated device 6f Communication device 6g Other power equipment 6h Interconnection point 1201 Phase shift unit 1202, 1203 Accumulator 1204, 1205 Low pass filter 1206 Measurement unit

Claims (13)

Modulation means for performing modulation processing for modulating active power or reactive power of a modulated power device, which is at least one of a plurality of power devices connected to the power system, using a modulation signal of a predetermined frequency;
Measuring means for performing a measurement process for measuring a voltage component of the predetermined frequency included in a voltage at a connection point between the measured power device as at least one of the plurality of power devices and the power system as a modulation component;
A voltage sensitivity measurement system comprising: calculation means for calculating voltage sensitivity using the modulation signal and the modulation component. The voltage sensitivity measurement system according to claim 1,
There are a plurality of modulated power devices,
The modulation means generates a plurality of modulation signals corresponding to the modulated power devices on a one-to-one basis, and for each of the modulated power devices, the effective power or reactive power of the modulated power device is determined as the modulated power. Modulate using the modulation signal corresponding to the device,
The plurality of modulation signals have different frequencies from each other,
The measuring means measures each of the voltage components of different frequencies included in the voltage of the interconnection point as the modulation component;
A voltage sensitivity measurement system, wherein the calculation means calculates voltage sensitivity using the modulation signal and the modulation component for each frequency. The voltage sensitivity measurement system according to claim 2,
A reference signal generating means for generating a reference signal;
The modulation means performs the modulation processing with reference to the reference signal,
The voltage sensitivity measurement system, wherein the measurement unit performs the measurement process based on the reference signal. The voltage sensitivity measurement system according to any one of claims 1 to 3,
And a control unit that controls the modulated power device based on the voltage sensitivity calculated by the voltage sensitivity measurement system.   When the information processing apparatus measures the voltage sensitivity, the modulated power device, which is at least one of a plurality of power devices connected to the power system, is enabled using a modulation signal having a predetermined frequency shared with the information processing device. A terminal device including modulation means for performing modulation processing for modulating power or reactive power. A power device to be measured that shares a predetermined frequency with an information processing device that measures voltage sensitivity, and that is at least one of a plurality of power devices connected to a power system when the information processing device measures the voltage sensitivity; Measurement means for performing measurement processing for measuring the voltage component of the predetermined frequency included in the voltage at the connection point with the power system as a modulation component;
A communication unit that outputs the modulation component measured by the measurement unit to the information processing apparatus. An information processing apparatus that shares a modulation signal with a predetermined frequency with the terminal apparatus according to claim 5, and shares the predetermined frequency with the terminal apparatus according to claim 6,
Receiving means for receiving a modulation component from the terminal device according to claim 6;
An information processing apparatus comprising: a calculating unit that calculates voltage sensitivity using the modulation signal and the modulation component received by the receiving unit. A voltage sensitivity measurement method performed by the voltage sensitivity measurement system,
A modulation step of performing modulation processing for modulating active power or reactive power of a modulated power device that is at least one of a plurality of power devices connected to the power system, using a modulation signal of a predetermined frequency;
A measurement step of performing a measurement process of measuring a voltage component of the predetermined frequency included in a voltage at a connection point between the power-under-measurement device that is at least one of the plurality of power devices and the power system as a modulation component;
A voltage sensitivity measurement method comprising: calculating a voltage sensitivity using the modulation signal and the modulation component. A power device control method performed by a power device control system,
Each step included in the voltage sensitivity measurement method according to claim 8;
A control step of controlling the modulated power device based on the voltage sensitivity. A voltage sensitivity measurement support method performed by a terminal device,
When the information processing apparatus measures the voltage sensitivity, the modulated power device, which is at least one of a plurality of power devices connected to the power system, is enabled using a modulation signal having a predetermined frequency shared with the information processing device. A voltage sensitivity measurement support method including a modulation step for performing a modulation process for modulating power or reactive power. A voltage sensitivity measurement support method performed by a terminal device,
A power device to be measured that shares a predetermined frequency with an information processing device that measures voltage sensitivity, and that is at least one of a plurality of power devices connected to a power system when the information processing device measures the voltage sensitivity; A measurement step of performing a measurement process of measuring a voltage component of the predetermined frequency included in a voltage at a connection point with the power system as a modulation component;
And a communication step of outputting the modulation component to the information processing apparatus. A voltage sensitivity measurement method performed by an information processing apparatus that shares a predetermined frequency with the terminal apparatus according to claim 5 and that shares the predetermined frequency with the terminal apparatus according to claim 6,
A receiving step of receiving a modulation component from the terminal device according to claim 6;
A voltage sensitivity measurement method comprising: calculating a voltage sensitivity using the modulation signal and the modulation component. On the computer,
A modulation procedure for performing modulation processing for modulating active power or reactive power of a modulated power device that is at least one of a plurality of power devices connected to the power system, using a modulation signal of a predetermined frequency;
A measurement procedure for performing a measurement process for measuring a voltage component of the predetermined frequency included in a voltage at a connection point between the power device to be measured that is at least one of the plurality of power devices and the power system as a modulation component;
A program for executing a calculation procedure for calculating voltage sensitivity using the modulation signal and the modulation component.

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