JP2013034295A - Voltage stabilizer installed in power generation facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly and reliably stabilize a voltage in response to change of an external load in a power generation facility, even when being separated from an external power system.SOLUTION: A voltage stabilizer 2 installed in a power generation facility 1: is installed in the power generation facility 1 comprising a power generator 3, a converter 4 for converting power generated by the power generator 3, and an inverter 5 for converting DC voltage converted by the converter 4 to AC voltage; and stabilizes voltage of power output to an external load 6. The voltage stabilizer 2 is installed in either of a power supply line between the power generator 3 and the converter 4, a power supply line between the converter 4 and the inverter 5, and a power supply line between the inverter 5 and the external load 6.

Description

  The present invention relates to a voltage stabilizing device provided in a power generation facility.

In hospitals, public institutions, remote islands and mountain houses, private power generation facilities (independent power generation facilities separated from the power system) may be provided.
In the power supply staff provided with such a private power generation facility, the external load connected to the power supply system is likely to fluctuate greatly in a short time in accordance with ON / OFF of the facility or electrical appliance at the power supply destination. When the external load fluctuates greatly, the supply voltage of the private power generation facility itself is likely to become unstable, and it becomes difficult to supply generated power with a stable voltage.

By the way, the electric power generated in the power generation facility may be sold to a system (referred to as an external power system) such as an electric power company. Therefore, the power generation facility may be always connected to the external power system. Such a power generation facility is called a power generation facility connected to an external power system.
Several technologies have been developed to cope with various troubles that occur in power generation facilities connected to an external power system.

  For example, Patent Document 1 discloses that “a steam generator that evaporates a working medium by heat exchange with a heating medium, an expander that expands the working medium evaporated by the steam generator to obtain mechanical power, and a cooling medium. A condenser that condenses the working medium expanded in the expander by heat exchange with the generator, a generator that is driven by the mechanical power obtained by the expander to generate power, and electric power generated by the generator or commercial power And the cooling medium introducing means for introducing the cooling medium into the condenser and the electric power transmitted to the cooling medium introducing means so that the operating conditions of the expander and the generator do not exceed predetermined values. And a control device for power generation.

  Further, Patent Document 2 discloses a turbine generator in which a permanent magnet type synchronous generator is connected to a gas turbine whose output can be controlled by a fuel flow rate, a converter connected to the turbine generator, and a converter and a load. An inverter connected to the transformer, a transformer means connected to the AC interconnection system, a rectifier means connected between the transformer means and the inverter, and a regenerative resistor connected to a DC section that is an output part from the converter, When the voltage fed from the turbine generator to the inverter through the converter is equal to or lower than a predetermined first voltage value, the inverter is fed from the AC interconnection system via the transforming means and the rectifying means, and turbine power generation is performed. When the voltage fed from the machine to the inverter via the converter is greater than or equal to a predetermined second voltage value, excess power is consumed by the regenerative resistor. Turbine generator apparatus is disclosed, characterized in that made.

JP 2007-006683 A JP 2005-218163 A

By the way, the electric power generation apparatus of the patent document 1 and the patent document 2 mentioned above stabilizes an output voltage in the condition always connected to the external electric power system which an electric power company etc. provide.
For example, in the power generation device of Patent Document 1, when the power supply from the external power system connected due to a power failure or the like is stopped, the rotor of the generator continues to rotate at a high speed, and the generator is damaged due to the excessive rotation speed. In order to prevent this, the electric power transmitted from the generator to the cooling medium introducing means is adjusted.

Further, the power generation apparatus of Patent Document 2 also has an excellent output response to load fluctuations by consuming surplus power with a regenerative resistor without providing a separate power storage element when power supply from the external power system is stopped. Is realized.
In other words, the power generation devices of Patent Document 1 and Patent Document 2 stabilize the voltage under the connection with an external power system that supplies a large amount of power, and are small-scale private power generation facilities that are different from the external power system ( The technology is completely different from the self-sustaining power generation facility separated from the external power system. In other words, in patent document 1 and patent document 2, the actual situation is that the voltage cannot be stabilized in response to fluctuations in the external load in a private power generation facility used on a remote island or the like.

  Therefore, in view of the above problems, the present invention provides a voltage stabilizing device and a voltage for a power generator that can quickly and reliably stabilize a voltage in response to a change in an external load even in a state of being disconnected from an electric power system. An object is to provide a stabilization method.

In order to achieve the object, the present invention takes the following technical means.
That is, the voltage stabilization device provided in the power generation facility of the present invention is a voltage stabilization device that is provided in the power generation facility provided with the power generation device and stabilizes the output voltage output to the external load, The voltage stabilization device is provided in a power supply line between the power generation device and an external load.

  Preferably, the voltage generator is provided in a power generation facility including a power generation device, a converter that converts electric power generated by the power generation device, and an inverter that converts a DC voltage converted by the converter into an AC voltage. The stabilization device may be provided in any of a power supply line between the power generation device and the converter, a power supply line between the converter and the inverter, and a power supply line between the inverter and the external load.

Preferably, the voltage stabilizing device includes a resistor provided between the poles of the power supply line, a voltage measuring instrument that measures a voltage between the poles, and a voltage measured by the voltage measuring instrument is a predetermined voltage. It is preferable to include a comparison unit that determines whether the current is flowing, and a switching unit that performs ON / OFF of the current flowing through the resistor in accordance with the comparison result of the comparison unit.
Preferably, the switching unit includes a command unit that issues a command in accordance with a comparison result in the comparison unit, and a switching element that is switched when a signal of the command unit is input.

Preferably, the switching element is any one of IGBT, SSR, and SSC.
Preferably, the voltage stabilization device includes a rectification unit, and rectifies a current from a power supply line in the rectification unit, and is configured to measure a voltage between electrodes by the voltage measuring device. Good.

  Preferably, the power generation device includes an evaporator for evaporating a liquid working medium, a generator for generating power using the vapor of the working medium generated by the evaporator, and an operation used for power generation by the generator. A condenser that condenses the vapor of the medium, and a pump that pumps the working medium liquefied by the condenser, and returns the working medium from the evaporator to the evaporator via the generator and the condenser. It is good to be the structure which produces electric power with a generator, making it generate.

  Preferably, the circulation amount of the working medium passing through the generator is controlled in conjunction with the voltage stabilization process in the voltage stabilization device.

  According to the voltage stabilization device and the voltage stabilization method provided in the power generation facility of the present invention, the voltage can be quickly and reliably stabilized in response to the fluctuation of the external load even when disconnected from the external power system. Can do.

It is a figure which shows the installation position of a voltage stabilization apparatus. It is explanatory drawing of the electric power generating apparatus provided with the voltage stabilization apparatus of 1st Embodiment. It is explanatory drawing of the electric power generating apparatus provided with the voltage stabilization apparatus of 2nd Embodiment. It is explanatory drawing of the electric power generating apparatus provided with the voltage stabilization apparatus of 3rd Embodiment. It is explanatory drawing of the electric power generating apparatus provided with the voltage stabilization apparatus of 4th Embodiment. It is explanatory drawing of the electric power generating apparatus provided with the voltage stabilization apparatus of 5th Embodiment. It is explanatory drawing of the electric power generating apparatus provided with the voltage stabilization apparatus of 6th Embodiment. It is explanatory drawing of the electric power generating apparatus provided with the voltage stabilization apparatus of 7th Embodiment. It is explanatory drawing of the electric power generating apparatus provided with the voltage stabilization apparatus of 8th Embodiment. It is explanatory drawing of the electric power generating apparatus provided with the voltage stabilization apparatus of 9th Embodiment. It is explanatory drawing of the electric power generating apparatus provided with the voltage stabilization apparatus of 10th Embodiment. It is explanatory drawing of the electric power generating apparatus provided with the voltage stabilization apparatus of 11th Embodiment. It is explanatory drawing which shows the voltage stabilization apparatus of 12th Embodiment.

Hereinafter, the embodiment of the voltage stabilization apparatus 2 provided in the power generation equipment 1 according to the present invention is shown.
The voltage stabilization device 2 of the present invention is provided in a self-supporting power generation facility 1 separated from an external power system (system such as a power company).
FIG. 1 shows a power generation facility 1 (self-supporting power generation facility 1) of the present embodiment.

  The power generation facility 1 includes a power generation device 3 capable of generating predetermined power (for example, three-phase power of a predetermined voltage), a converter 4 that converts power generated by the power generation device 3, and an inverter 5. . Specifically, three-phase power of a predetermined voltage generated by the power generation device 3 is sent to the converter 4 and converted into direct current. The direct current converted by the converter 4 is sent to the inverter 5 and converted into electric power (for example, three-phase 200 V, 60 Hz) corresponding to the external load 6.

By the way, in such a self-supporting power generation facility 1, when the external load 6 fluctuates greatly, the supply voltage tends to become unstable, and it becomes difficult to supply the generated power with a stable voltage. In order to cope with this problem, the power generation facility 1 of the present invention is provided with a voltage stabilizing device 2.
The voltage stabilizing device 2 includes a power supply line (position A shown in FIG. 1) between the inverter 5 and the external load 6, and a power supply line (position B shown in FIG. 1) between the converter 4 and the inverter 5. ), Which is arranged in one of the power supply lines (position C shown in FIG. 1) between the generator 9 and the converter. In addition, a plurality of devices can be adopted for the mechanism of the voltage stabilization device 2 provided at each position. Hereinafter, these will be described in order as the first to twelfth embodiments.

As a mechanism used in the power generation apparatus, a turbine generator, a diesel generator, a wind power generator, a hydraulic power generator, or the like may be used. In this embodiment, a binary generator will be described as an example.
[First Embodiment]
FIG. 2 shows a first embodiment of a voltage stabilization device 2 provided in the power generation facility 1.

  As shown in this figure, the power generation device of this embodiment is a binary power generation device that generates power using heat outside the facility as a heat source, and an evaporator 8 that evaporates a liquid working medium; A generator 9 that generates power by rotating a turbine of an expander (for example, a screw turbine of a screw expander) using steam of a working medium generated by the evaporator 8, and is used for power generation by the generator 9. And a condenser 10 for condensing the vapor of the working medium. The evaporator 8, the generator 9, and the condenser 10 are connected by a closed loop circulation pipe 11 that circulates the working medium. The working pipe (for example, a low-boiling organic substance having a boiling point lower than that of water) is connected to the circulation pipe 11. A medium circulation pump 12 is provided that circulates the medium, etc.) in the order of returning from the evaporator 8 to the evaporator 8 via the generator 9 and the condenser 10.

  As shown in FIG. 2, the voltage stabilizing device 2 of the first embodiment is an AC wiring (power supply line at position A shown in FIG. 1) from the inverter 5 to the output (external load 6). 5 is a wiring connecting two phases (between two poles) of three phases (three poles), in other words, between sr, st, and rt. Each is provided, and the voltage between each phase is adjusted by adjusting the current flowing between these phases.

  The voltage stabilization device 2 provided between the phases includes a resistor 13 provided on a wiring connecting the phases (between the poles), and a voltage measuring device 14 that measures a voltage between the phases. Further, the voltage stabilization device 2 compares (determines) whether or not the voltage measured by the voltage measuring instrument 14 is a predetermined voltage, and according to the result of determination by the comparison unit 15. The switching part 16 which act | operates is provided. The switching unit 16 includes a high-frequency gate command unit 17 (command unit) and an IGBT 18 (power switching element) to which a signal from the high-frequency gate command unit 17 is input. Note that a commutator may be provided in parallel with the switching unit on the wiring connecting the phases.

Next, the resistor 13, the voltage measuring device 14, the comparison unit 15, and the switching unit 16 that constitute the voltage stabilization device 2 will be described in detail.
The resistor 13 is provided on the wiring connecting the two phases. A predetermined resistance value is given to the resistor 13 so that a predetermined current flows from one wiring to the other wiring and power is consumed so that the voltage between the two phases can be adjusted to a desired value. It has become.

The voltage measuring device 14 is a voltmeter that measures a voltage between two phases. The measured value of the voltage measured by the voltage measuring device 14 is output to the comparison unit 15.
The comparison unit 15 compares and determines whether or not the voltage measured by the voltage measuring device 14 is a predetermined voltage, and includes a comparator. The comparison unit 15 sends a comparison result (signal) to the switching unit 16 when the measured voltage value deviates from a predetermined voltage range.

  The comparison result from the comparison unit 15 is input to the high-frequency gate command unit 17, and the high-frequency gate command unit 17 controls the IGBT based on the signal from the comparison unit 15 at a high frequency of 20 kHz, for example. Specifically, when the comparison unit 15 determines that the measured value of the voltage between the two phases has deviated from a predetermined voltage range (threshold), the high-frequency gate command unit 17 performs switching with respect to the gate of the IGBT 18. Apply voltage to operate. When the IGBT 18 performs a switching operation (ON operation), a current flows between the collector and the emitter of the IGBT 18 and a current also flows through the resistor 13, so that the voltage between the two phases is lowered and the voltage between the two phases can be changed. . Since the switching operation is performed at a high frequency by the high-frequency gate command unit 17, the voltage between the two phases can be adjusted to a desired value. The IGBT 18 may be provided with a commutator that allows the current to flow in a direction opposite to the direction of the current during switching, in parallel with the switching unit 16.

As described above, when the voltage stabilizing device 2 of the first embodiment is used, the voltage between s-r, s-t, and rt among the three-phase alternating current output from the inverter 5 of the power generation facility 1. Can be kept within a predetermined range, the output voltage can be made constant constantly in response to fluctuations in the external load 6, and power with excellent quality can be supplied from the power generation facility 1. Become.
[Second Embodiment]
Next, the voltage stabilization apparatus 2 of 2nd Embodiment is demonstrated.

FIG. 3 shows a second embodiment of the voltage stabilization device 2 provided in the power generation facility 1.
As shown in FIG. 3, the voltage stabilizing device 2 of the second embodiment is similar to the first embodiment in that the AC wiring from the inverter 5 to the external load 6 (the power supply line at the position A shown in FIG. 1). And it is each provided in the three-phase alternating current wiring output from the inverter 5, and the voltage between each phase is adjusted by adjusting the electric current which flows between these phases.
The voltage stabilizing device 2 provided between each phase is the same as in the first embodiment, in addition to the resistor 13, the voltage measuring device 14, and the comparing unit 15, and the current flowing through the resistor 13 according to the result of determination by the comparing unit 15. The switching part 16 which turns ON / OFF is provided. Unlike the first embodiment, an SSR 19 (Solid State Relay) is used for the switching unit 16.

Next, the comparison part 15 and the switching part 16 which comprise the voltage stabilization apparatus 2 of 2nd Embodiment are demonstrated in detail.
Similar to the voltage stabilization device 2 of the first embodiment, the voltage measuring instrument 14 measures the voltage before and after the resistor 13, specifically, the voltage between the two phases. The measured value of the voltage measured by the voltage measuring device 14 is output to the comparison unit 15. The comparison unit 15 compares and determines whether or not the voltage measured by the voltage measuring device 14 is a predetermined voltage, and includes a comparator. The comparison unit 15 sends a comparison result (signal) to the switching unit 16 when the measured voltage value deviates from a predetermined voltage range.

  The comparison result (signal) from the comparison unit 15 is input to the switching unit 16. The switching unit 16 controls the SSR 19 based on the signal from the comparison unit 15. Specifically, when the comparison unit 15 determines that the measured value of the voltage between the two phases has deviated from a predetermined voltage range (threshold), the switch is turned off from the comparison unit 15 to the SSR 19 of the switching unit 16. → A signal to turn on is output. Then, a current flows through the resistor, the voltage between the two phases is lowered, and the voltage between the two phases can be changed.

  A plurality of SSRs 19 (three in the case of the present embodiment) can be used for one switching unit 16 between each phase, and when a plurality of SSRs 19 are used, they are preferably provided in parallel. For example, in the illustrated example, three SSRs 19 are provided in parallel, and the voltage between two phases can be adjusted to a plurality of set values by turning on one of the three SSRs 19 (a combination to turn on). it can. Note that the switching unit 16 described above may use a contactor (SSC) instead of the SSR 19.

As described above, when the voltage stabilizing device 2 of the second embodiment is used, the voltage between s-r, s-t, and rt among the three-phase alternating current output from the inverter 5 of the power generation facility 1. Can be kept within a predetermined range, and the output voltage can be made constant for each phase in response to the fluctuation of the external load 6 quickly. Supply becomes possible.
The switching in the above SSR 19 requires about 0.1 s for ON / OFF switching and 8.5 ms to 0.1 s for 60 Hz in response to the output fluctuation, which is more responsive than the case of the first embodiment. The speed is slow. However, if the power consumption at the resistor 13 is increased by a multiple of 0.1 kW, 0.2 kW, 0.4 kW, 0.8 kW, 1.6 kW, 3.2 kW, 6.4 kW, and 12.8 kW, the value becomes 0.1. By switching on the LSB for 1 kW, MSB for 12.8 kW, and turning on the binary number sequentially from the MSB, the resistance can be switched, the voltage change is small, and the voltage can be quickly set to a predetermined value.
[Third Embodiment]
Next, the voltage stabilization apparatus 2 of 3rd Embodiment is demonstrated.

FIG. 4 shows a third embodiment of the voltage stabilization device 2 provided in the power generation facility 1.
The voltage stabilizing device 2 of the third embodiment is the same in that an IGBT 18 is used for the switching unit 16 as in the first embodiment. However, the point which rectifies | straightens the output from each phase differs from 1st Embodiment.
The IGBT 18 can be switched when a current flows in the forward direction, but cannot switch when a current flows in the reverse direction. Therefore, full-wave rectification of the AC interphase current is performed in advance using the rectifier circuit 20 of the third embodiment, and the voltage between the phases is adjusted using the current (forward current) after full-wave rectification.

Specifically, the rectifier circuit 20 according to the third embodiment includes two wires connected in series with two diodes 21 in parallel, and a two-phase alternating current is provided between the diodes 21 and 21 in each wire. Any one of the wirings is connected.
The voltage stabilization device 2 of the present embodiment includes three rectifier circuits 20, resistors 13, a voltage measuring instrument 14, a comparison unit 15, and three switching units 16.

  In the voltage stabilizing device 2, the voltage measuring device 14 measures the voltage between the two phases, and the result is output to the comparison unit 15. The comparison result (signal) from the comparison unit 15 is input to the high-frequency gate command unit (command unit) 17, and the high-frequency gate command unit 17 controls the IGBT 18. Since the switching command by the high-frequency gate command unit 17 is performed at a high frequency, the voltage between the two phases can be adjusted to a desired value also in this embodiment.

As described above, when the voltage stabilizing device 2 of the third embodiment is used, the voltage between s-r, s-t, and rt among the three-phase alternating current output from the inverter 5 of the power generation facility 1. Can be kept within a predetermined range, the output voltage can be made constant constantly in response to fluctuations in the external load 6, and power with excellent quality can be supplied from the power generation facility 1. .
[Fourth Embodiment]
Next, the voltage stabilization apparatus 2 of 4th Embodiment is demonstrated.

FIG. 5 shows a fourth embodiment of the voltage stabilization device 2 provided in the power generation facility 1.
The voltage stabilizing device 2 of the fourth embodiment is the same in that an IGBT 18 is used for the switching unit 16 as in the third embodiment. However, the point that the output is rectified in “all phases” is different from the third embodiment.
The rectifier circuit 20 according to the fourth embodiment includes three wires connected in series with two diodes 21 in parallel, and any one of the three-phase AC wires is interposed between the diodes 21 and 21 in each wire. Each is connected.

And the voltage measurement means 14 of 4th Embodiment measures the voltage between any two phases among the three-phase alternating current wiring with the voltage measuring device 14, and the result is output to the comparison part 15. FIG.
The result from the comparison unit 15 is input to the high frequency gate command unit 17 (command unit), and the high frequency gate command unit 17 controls the IGBT 18. Since the switching command by the high-frequency gate command unit 17 is performed at a high frequency, the voltage of all phases can be adjusted to a desired value in this embodiment. Further, unlike the third embodiment, the voltage between each phase is not measured and adjusted, so that the effect of correcting the voltage imbalance between the phases cannot be expected, but the switching unit required for the control. Since only one 16 (high-frequency gate command unit 17 and IGBT 18) is required, the manufacturing cost can be reduced.
[Fifth Embodiment]
Next, the voltage stabilization apparatus 2 of 5th Embodiment is demonstrated.

The first to fourth embodiments described above are examples in which the voltage stabilizing device 2 is provided between the inverter 5 and the external load 6, but the following fifth to eighth embodiments are described. An example is shown in which the voltage stabilizing device 2 is disposed between the generator 9 and the converter 4 (the power supply line at the position C shown in FIG. 1).
FIG. 6 shows a fifth embodiment of the voltage stabilization device 2 provided in the power generation facility 1.

Similar to the voltage stabilization device 2 of the first embodiment, the voltage stabilization device 2 of the fifth embodiment includes a resistor 13, a voltage measuring device 14, a comparison unit 15, and a switching unit 16. The switching unit 16 Is composed of a high-frequency gate command unit 17 and an IGBT 18, and the circuit configuration itself is the same as that of the first embodiment.
In the voltage stabilizing device 2 of the fifth embodiment, the voltage stabilizing device 2 is provided to connect two of the three phases with respect to the three-phase AC wiring between the generator 9 and the inverter 5. The voltage between the two phases can be adjusted to a desired value.

Therefore, also in the voltage stabilization apparatus 2 of 5th Embodiment, each voltage between the two phases between s-r, s-t, and rt among the three-phase alternating current output from the electric power generation equipment 1 is shown. The output voltage can be kept constant within a predetermined range, quickly responding to fluctuations in the external load 6, and power with excellent quality can be supplied from the power generation facility 1.
In addition, in the voltage stabilizing device 2 of the fifth embodiment, the converter 4 and the inverter 5 are provided between the voltage stabilizing device 2 and the external load 6, and a capacitor, a coil, or the like is provided between the output. Many are included. Therefore, even when noise is caused by the switching operation of the IGBT 18 in the power output from the power generation facility 1, the voltage-adjusted power is supplied to the external load 6 through the converter 4 and the inverter 5, so that the switching operation of the IGBT 18 is performed. The effect of reducing the influence of noise due to can be expected.

  Note that, as indicated by a dotted line in FIG. 6, the voltage stabilizing device 2 of the fifth embodiment is provided between the converter 4 and the inverter 5 instead of the one that adjusts the voltage based on the voltage between the two phases. The voltage between the two phases between s-r, s-t, and rt can be configured to fall within a predetermined range based on the voltage of the DC wiring. Specifically, among the members constituting the voltage stabilizing device 2 described above, the resistor 13 and the IGBT 18 are disposed between the inverter 5 and the generator 9, and the voltage measuring instrument 14, the comparison unit 15, the high-frequency gate command Only the unit 17 (command unit) is provided in the DC wiring between the converter 4 and the inverter 5. Then, a command may be sent from the high-frequency gate command unit 17 to the gates of the three IGBTs 18 based on the voltage flowing through the DC wiring between the converter 4 and the inverter 5.

In this way, the voltage measuring device 14, the comparison unit 15, the high-frequency gate command unit 18 and the like required for the control are only one, so that the manufacturing cost can be suppressed.
[Sixth Embodiment]
Next, the voltage stabilization apparatus 2 of 6th Embodiment is demonstrated.
FIG. 7 shows a sixth embodiment of the voltage stabilization device 2 provided in the power generation facility 1.

Similar to the voltage stabilization device 2 of the second embodiment, the voltage stabilization device 2 of the sixth embodiment includes a resistor 13, a voltage measuring device 14, a comparison unit 15, and an SSR 19 (switching unit 16). The configuration itself is the same as in the second embodiment.
In the voltage stabilization device 2 of the sixth embodiment, the voltage stabilization device 2 is provided so as to connect two of the three phases with respect to the three-phase AC wiring between the generator 9 and the converter 4. The voltage between the two phases can be adjusted to a desired value.

  Also in the voltage stabilizing device 2 of the sixth embodiment, the voltage between the two phases between s-r, s-t, and rt among the three-phase alternating current output from the power generation facility 1 is within a predetermined range. Thus, the output voltage can be made constant at all times by quickly responding to fluctuations in the external load 6. In addition, even when noise due to the switching operation of the SSR 19 is placed on the power output from the power generation facility 1, the voltage-adjusted power is supplied to the external load 6 via the converter 4 and the inverter 5, so that the switching operation of the SSR 19 The effect of reducing the influence of noise due to can be expected.

  As shown by the dotted line in FIG. 7, the voltage stabilizing device 2 of the sixth embodiment also includes the resistor 13 and the SSR 19 between the generator 9 and the converter 4 among the members constituting the voltage stabilizing device 2. While being deployed, only the voltage measuring device 14 and the comparison unit 15 are provided in the DC wiring between the converter 4 and the inverter 5, and the comparison unit 15 determines from the voltage flowing through the DC wiring between the converter 4 and the inverter 5. A switching command (ON / OFF command) may be sent to the three SSRs 19.

In this way, since only one voltage measuring instrument 14, a comparison unit 15 (command unit), and the like required for control are required, manufacturing costs can be reduced.
Note that the switching unit 16 described above may use a contactor (SSC) instead of the SSR 19.
[Seventh Embodiment]
Next, the voltage stabilization apparatus 2 of 7th Embodiment is demonstrated.

FIG. 8 shows a seventh embodiment of the voltage stabilizing device 2 provided in the power generation facility 1.
Similarly to the voltage stabilization device 2 of the third embodiment, the voltage stabilization device 2 of the seventh embodiment includes a resistor 13, a voltage measuring device 14, a comparison unit 15, and a switching unit 16 using an IGBT 18. A rectifier circuit 20 having two wires connected in series with two diodes 21 in parallel is provided between each two phases.

  Even when the rectifier circuit 20 of the seventh embodiment is used, like the voltage stabilizing device 2 of the third embodiment, the AC interphase current is full-wave rectified in advance, and the current after the full-wave rectification (forward current) ) Can be used to adjust the voltage between the phases. Moreover, even when noise is placed on the power output from the power generation facility 1 by the switching operation of the IGBT 18, an effect that the influence of the noise can be reduced can be expected.

Since the configuration and operational effects of the voltage stabilizing device 2 of the seventh embodiment other than those described above are the same as those of the third embodiment, description thereof will be omitted.
[Eighth Embodiment]
Next, the voltage stabilization apparatus 2 of 8th Embodiment is demonstrated.
FIG. 9 shows an eighth embodiment of the voltage stabilization device 2 provided in the power generation facility 1.

The voltage stabilizing device 2 of the eighth embodiment uses the IGBT 18 for the switching unit 16 as in the fourth embodiment, and is the fourth embodiment in that the output is rectified in “all phases”. It has the same form.
The voltage stabilizing device 2 of the eighth embodiment is different from that of the fourth embodiment in that the voltage stabilizing device 2 is arranged between the generator 9 and the converter 4, and the influence of noise on the output power is reduced. It is the point where the effect that it can reduce is demonstrated.

Since the configuration and operational effects of the voltage stabilizing device 2 of the eighth embodiment other than those described above are the same as those of the fourth embodiment, description thereof will be omitted.
[Ninth Embodiment]
Next, the voltage stabilization apparatus 2 of 9th Embodiment is demonstrated.
The first to eighth embodiments described above are examples in which the voltage stabilizing device 2 is provided between the inverter 5 and the external load 6 or between the generator 9 and the converter 4. The ninth and tenth embodiments shown are examples in which the voltage stabilizing device 2 is disposed between the converter 4 and the inverter 5 (the power supply line at the position B shown in FIG. 1), in other words, in the DC line. Show.

FIG. 10 shows a ninth embodiment of the voltage stabilization device 2 provided in the power generation facility 1.
The voltage stabilizing device 2 according to the ninth embodiment includes a resistor 13, a voltage measuring device 14, a comparison unit 15, and a switching unit 16, like the voltage stabilizing device 2 according to the first and fifth embodiments. The switching unit 16 includes a high-frequency gate command unit 17 (command unit) and an IGBT 18, and the circuit configuration itself is the same as that of the first and fifth embodiments.

In the voltage stabilizing device 2 of the ninth embodiment, unlike the three-phase alternating current described above, only one voltage stabilizing device 2 is provided so as to connect the DC wirings between the converter 4 and the inverter 5. Thus, the installation position and the number of installations of the voltage stabilization device 2 are different from those of the first embodiment and the fifth embodiment.
Since the voltage stabilizing device 2 of the ninth embodiment uses the IGBT 18 that operates based on a high-frequency command from the high-frequency gate command unit 17 as in the first and fifth embodiments, the switching operation of the IGBT 18 is performed. Thus, by lowering the voltage between the DC wirings, the voltage can be adjusted to a desired value, and power with excellent quality from the power generation facility 1 can be supplied.

Compared with the first and fifth embodiments, only one resistor 13, voltage measuring instrument 14, comparing unit 15, and switching unit 16 (high-frequency gate command unit 17 and IGBT 18) are required for control. Therefore, the manufacturing cost can be suppressed. If a constant current always flows through the resistor 13, it is possible to follow both the rise and fall of the voltage due to the external load 6.
[Tenth embodiment]
Next, the voltage stabilization apparatus 2 of 10th Embodiment is demonstrated.

FIG. 11 shows a tenth embodiment of the voltage stabilization device 2 provided in the power generation facility 1.
Similar to the voltage stabilization device 2 of the second and sixth embodiments, the voltage stabilization device 2 of the tenth embodiment includes a resistor 13, a voltage measuring device 14, a comparison unit 15, and an SSR 18 (switching unit 16). The circuit configuration itself is the same as in the second and sixth embodiments.

In the voltage stabilizing device 2 of the tenth embodiment, only one switching unit 16 is provided so as to connect the DC wirings between the converter 4 and the inverter 5, and the installation position and switching of the voltage stabilizing device 2 are switched. The number of installed parts 16 is different from the above-described embodiment.
Also in the voltage stabilizing device 2 of the tenth embodiment, the voltage between the DC wires can be adjusted to a desired value by the switching operation of the SSR 19 as in the case of the IGBT 18 of the ninth embodiment. In addition, since only one resistor 13, voltage measuring instrument 14, comparing unit 15, and switching unit 16 are required for control, the manufacturing cost can be reduced.
[Eleventh embodiment]
Next, the voltage stabilization apparatus 2 of 11th Embodiment is demonstrated.

FIG. 12 shows an eleventh embodiment of the voltage stabilization device 2 provided in the power generation facility 1.
In the voltage stabilizing device 2 of the eleventh embodiment, a part of the output power after the current stabilization is fed back to the power for operating the auxiliary machine such as the medium circulation pump 12 that circulates the binary power generation working medium. It is an example. In addition to the medium circulation pump 12, examples of the auxiliary machine include a control device such as the comparison unit 15 and a pump (not shown) for circulating cooling water through the condenser 10.

  Specifically, the voltage stabilization device 2 of the eleventh embodiment includes a resistor 13, a voltage measuring device 14, a comparison unit 15, and a switching unit 16 using an IGBT 18, and includes a generator 9 and a converter 4. Between two phases (between sr, st, and rt). An inverter 5 is connected (in parallel) to a DC output wiring from the converter 4 to the external load 6, and the output converted from DC to AC by the inverter 5 is used as a power source for operating the auxiliary machine.

In this way, if the auxiliary power supply is supplemented by the power generated by itself, even if it is not grid-connected to the external power grid, or if the power grid is linked to the external power grid, Independent and stable power supply can be continued only with the generated power.
The above-described example is an example in which the voltage stabilization device 2 is provided between the generator 9 and the converter 4 (position C shown in FIG. 1). You may arrange | position between the external load 6 (position A shown in FIG. 1) and between the converter 4 and the inverter 5 (electric power supply line of the position B shown in FIG. 1).

Further, the AC power supplied to the auxiliary machine via the inverter 5 may be single-phase or three-phase.
[Twelfth embodiment]
Next, the voltage stabilization apparatus 2 of 12th Embodiment is demonstrated.
FIG. 13 shows a twelfth embodiment of the voltage stabilization device 2 provided in the power generation facility 1.

  The voltage stabilization device 2 of the twelfth embodiment measures the current flowing through the resistor 13 or the ON time (Duty) of the IGBT 18 or the like (switching element), and flows into the generator 9 of the power generation device 3 in accordance with the measured value. The amount of the working medium is changed. In other words, the voltage stabilizing device 2 of the twelfth embodiment controls the circulation amount of the working medium that passes through the expander portion of the generator 9 in conjunction with the voltage stabilizing process in the voltage stabilizing device 2. is there.

  Specifically, in the voltage stabilizing device 2 of the twelfth embodiment, the circulation pipe 11 in the portion where the generator 9 of the power generation apparatus 3 is provided is in parallel with the circulation pipe 11 passing through the generator 9. A plurality of such bypass pipes 22 (three in the illustrated example) are provided. These bypass pipes 22 are provided with bypass valves 23 that adjust the flow rate of the working medium that passes through the bypass pipes 22, and the amount of the working medium that flows into the generator 9 by opening and closing each bypass valve 23. It can be adjusted.

On the other hand, the voltage stabilizing device 2 is provided with an ammeter 24 capable of measuring the current flowing through the resistor 13, and the current value measured by the ammeter 24 is input to the bypass valve command unit 25. The bypass valve command unit 25 can open and close the bypass valve 23 by sending a command to each bypass valve 23 based on the measured current value.
As described above, by limiting the current value to the resistor 13 installed between each phase so that the voltage of each phase becomes a constant value (within a certain threshold value), a response of several tens of μsec can be obtained. If the current value to 13 is maintained as it is, for example, when the current value to the resistor 13 becomes maximum at the next load change, the output voltage is controlled to be constant only by limiting the current to the resistor 13. Will not be able to.

Therefore, in addition to the above-described voltage control, the current flowing through the resistor 13 is measured, and the control of the bypass valve 23 is followed over several seconds so that the current value becomes a predetermined value. Thus, the uncontrollability of the output voltage that occurs when the current value to the resistor 13 becomes the maximum value can be suppressed.
In the above-described example, an example in which the current flowing through the resistor 13 of the voltage stabilization device 2 is measured has been described. However, instead of the current value, the percentage of time during which the IGBT 18 and the transistor are turned on (on duty) is measured. Alternatively, the bypass valve 23 may be controlled using the measurement result.

Moreover, although the example mentioned above was an example which provided multiple bypass piping 22, when using the bypass valve 23 which can adjust an opening degree over several steps, the opening degree of the bypass valve 23 is set to the current value or You may control based on the time when the switching element is ON.
In the above-described figure, the output to the external load 6 is a three-phase AC. However, if the inverter 5 is removed from between the voltage stabilizing device 2 and the external load 6, DC power is supplied to the external load 6. You can also.

  In addition, it is assumed that the bypass valve cannot be changed any more at the next load change, such as when the bypass valve is fully opened from the normal state (pre-control state). In order to cope with such a situation, the rotational speed of the working medium pump 12 may be changed according to the number of open bypass valves and the opening degree of the bypass valves. By doing in this way, it becomes possible to control to gradually return the bypass valve to the normal state over several minutes.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. In particular, in the embodiment disclosed this time, matters that are not explicitly disclosed, for example, operating conditions and operating conditions, various parameters, dimensions, weights, volumes, and the like of a component deviate from a range that a person skilled in the art normally performs. Instead, values that can be easily assumed by those skilled in the art are employed.

DESCRIPTION OF SYMBOLS 1 Power generation equipment 2 Voltage stabilization apparatus 3 Power generation apparatus 4 Converter 5 Inverter 6 External load 8 Evaporator 9 Generator 10 Condenser 11 Circulation piping 12 Medium circulation pump 13 Resistance 14 Voltage measuring device 15 Comparison part 16 Switching part 17 High frequency gate command Part 18 IGBT
19 SSR
20 Rectifier circuit 21 Diode 22 Bypass piping 23 Bypass valve 24 Ammeter 25 Bypass valve command section

Claims (8)

A voltage stabilization device that is provided in a power generation facility including a power generation device and stabilizes an output voltage output to an external load,
The voltage stabilizing device is provided in a power generation facility, wherein the voltage stabilizing device is provided in a power supply line between the power generating device and an external load. The power generation facility includes a converter that converts electric power generated by the power generation device, and an inverter that converts DC power converted by the converter into AC power,
The voltage stabilizing device is provided in any of a power supply line between the power generation device and the converter, a power supply line between the converter and the inverter, and a power supply line between the inverter and the external load. The voltage stabilization apparatus provided in the power generation facility according to claim 1.   The voltage stabilizing device includes a resistor provided between the electrodes of the power supply line, a voltage measuring device that measures a voltage between the resistors, and whether or not the voltage measured by the voltage measuring device is a predetermined voltage. The comparison unit according to claim 1, further comprising: a comparison unit that determines whether the current flows through the resistor according to a comparison result in the comparison unit. Voltage stabilizer.   The switching unit includes a high-frequency command unit that issues a command according to a comparison result in the comparison unit, and a switching element that is switched when a signal of the high-frequency command unit is input. The voltage stabilization device according to claim 3.   5. The voltage stabilizing device according to claim 3, wherein the switching unit is made of any one of IGBT, SSR, and SSC.   The voltage stabilizing device includes a rectifying unit, and rectifies a current from a power supply line in the rectifying unit, and is configured to measure a voltage between resistors by the voltage measuring device. The voltage stabilization device according to any one of claims 1 to 5, wherein   The power generation device includes an evaporator for evaporating a liquid working medium, a power generator that generates power using the steam of the working medium generated by the evaporator, and a steam of the working medium used for power generation by the power generator. A condenser for condensing the liquid and a pump for pumping the working medium liquefied by the condenser, and generating power while returning the working medium from the evaporator to the evaporator via the generator and the condenser. The voltage stabilizing device according to claim 1, wherein the voltage stabilizing device is configured to generate electric power with a machine.   The voltage according to any one of claims 1 to 7, wherein the voltage is configured to control a circulation amount of the working medium passing through the generator in conjunction with a voltage stabilization process in the voltage stabilization device. Stabilizer.

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