CN112952860A - Generator frequency modulation control method and device - Google Patents
Generator frequency modulation control method and device Download PDFInfo
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Abstract
The invention discloses a generator frequency modulation control method and a generator frequency modulation control device, which are used for solving the problem of how to improve the generator frequency modulation effectiveness. This scheme includes: monitoring an actual rotating speed value and an actual frequency value of a target generator; respectively determining a first rotating speed deviation value and a frequency deviation value according to the actual rotating speed value and the actual frequency value; determining a second rotating speed deviation value corresponding to the frequency deviation value according to a preset corresponding relation between the rotating speed and the frequency of the target generator; and when the difference value of the first rotating speed deviation value and the second rotating speed deviation value is larger than the preset deviation value, generating a frequency modulation control command according to the larger one of the first rotating speed deviation value and the second rotating speed deviation value so as to control the target generator to execute frequency modulation action. According to the scheme of the embodiment of the invention, the frequency modulation control instruction is generated according to the relatively effective larger numerical value in the monitored actual rotating speed value and actual frequency value, so that the frequency regulation effectiveness of the generator is improved, and the safety of the power grid where the generator is positioned is further improved.
Description
Technical Field
The invention relates to the field of generator control, in particular to a generator frequency modulation control method and device.
Background
In the field of generator control, after a generator is connected to a power grid, when the power demand of the power grid changes, the outlet current of the generator in the power grid changes, and therefore the electromagnetic resistance on a rotor of the generator in the power grid changes. Under the condition that the steam inlet quantity of the steam turbine is not changed, the change of the electromagnetic resistance enables the rotating speed of the generator in the power grid to change, and further the frequency of the whole power grid can be changed. In order to ensure the stable frequency of the power grid, the control system is often required to control the steam inlet regulating valve of the steam turbine to control the steam inlet amount, so that the rotating speed of the steam turbine is close to a rated value, and further, the adjustment of the frequency of the power grid is realized. However, the operation parameters of the generator are complex, so that the frequency of the generator is difficult to be adjusted efficiently and accurately.
How to improve generator frequency regulation effectiveness is the technical problem that this application will solve.
Disclosure of Invention
The embodiment of the application aims to provide a generator frequency modulation control method and device, and aims to solve the problem that the generator frequency modulation effectiveness is poor.
In a first aspect, a generator frequency modulation control method is provided, including:
monitoring an actual rotating speed value and an actual frequency value of a target generator;
respectively determining a first rotating speed deviation value and a frequency deviation value according to the actual rotating speed value and the actual frequency value, wherein the first rotating speed deviation value is an absolute value of the difference between the rated rotating speed value and the actual rotating speed value of the target generator, and the frequency deviation value is an absolute value of the difference between the rated frequency value and the actual frequency value of the target generator;
determining a second rotating speed deviation value corresponding to the frequency deviation value according to a preset corresponding relation between the rotating speed and the frequency of the target generator;
and when the difference value of the first rotating speed deviation value and the second rotating speed deviation value is larger than a preset deviation value, generating a frequency modulation control command according to the larger one of the first rotating speed deviation value and the second rotating speed deviation value so as to control the target generator to execute frequency modulation action.
In a second aspect, there is provided a generator frequency modulation control apparatus, comprising:
the monitoring module is used for monitoring the actual rotating speed value and the actual frequency value of the target generator;
the first determining module is used for respectively determining a first rotating speed deviation value and a frequency deviation value according to the actual rotating speed value and the actual frequency value, wherein the first rotating speed deviation value is an absolute value of a difference between a rated rotating speed value and the actual rotating speed value of the target generator, and the frequency deviation value is an absolute value of a difference between a rated frequency value and the actual frequency value of the target generator;
the second determining module is used for determining a second rotating speed deviation value corresponding to the frequency deviation value according to the preset corresponding relation between the rotating speed and the frequency of the target generator;
and the control module generates a frequency modulation control instruction according to the greater one of the first rotating speed deviation value and the second rotating speed deviation value when the difference value between the first rotating speed deviation value and the second rotating speed deviation value is greater than a preset deviation value so as to control the target generator to execute frequency modulation action.
In a third aspect, an electronic device is provided, the electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to the first aspect.
In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the method as in the first aspect.
In the embodiment of the application, the actual rotating speed value and the actual frequency value of the target generator are monitored; respectively determining a first rotating speed deviation value and a frequency deviation value according to the actual rotating speed value and the actual frequency value; determining a second rotating speed deviation value corresponding to the frequency deviation value according to a preset corresponding relation between the rotating speed and the frequency of the target generator; and when the difference value of the first rotating speed deviation value and the second rotating speed deviation value is larger than the preset deviation value, generating a frequency modulation control command according to the larger one of the first rotating speed deviation value and the second rotating speed deviation value so as to control the target generator to execute frequency modulation action. According to the scheme of the embodiment of the invention, the frequency modulation control instruction is generated by a relatively effective large numerical value according to the monitored actual rotating speed value and the actual frequency value, so that the frequency regulation effectiveness is effectively improved, and the safety of a power grid where the generator is positioned is further improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flow chart of a generator frequency modulation control method according to an embodiment of the present invention.
Fig. 2 is a second flow chart of the generator frequency modulation control method according to an embodiment of the present invention.
Fig. 3 is a third flow chart of a generator frequency modulation control method according to an embodiment of the present invention.
Fig. 4 is a fourth flowchart of a generator frequency modulation control method according to an embodiment of the present invention.
Fig. 5 is a fifth flowchart illustrating a generator frequency modulation control method according to an embodiment of the present invention.
Fig. 6 is a sixth flowchart of a generator frequency modulation control method according to an embodiment of the present invention.
Fig. 7 is a seventh schematic flow chart of a generator frequency modulation control method according to an embodiment of the present invention.
Fig. 8 is a logic diagram of a generator frequency modulation control method according to an embodiment of the present invention.
Fig. 9 is a second logic diagram of the generator frequency modulation control method according to an embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a generator frequency modulation control device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The reference numbers in the present application are only used for distinguishing the steps in the scheme and are not used for limiting the execution sequence of the steps, and the specific execution sequence is described in the specification.
In order to solve the problems existing in the prior art, an embodiment of the present application provides a generator frequency modulation control method, as shown in fig. 1, including:
s11: and monitoring the actual rotating speed value and the actual frequency value of the target generator.
The rotation speed value of the generator is the rotation speed value of the main shaft of the generator, and generally refers to the maximum number of revolutions that the main shaft of the generator can complete within one minute. The magnitude of the speed value is one of the important parameters for indicating the engine grade, and is one of the key factors for determining the internal transmission rate of the engine. The rotational speed of the generator is usually expressed in revolutions per minute, denoted by the notation r/min. In the scheme provided by this embodiment, the actual rotation speed value of the target generator may be directly obtained through measurement of the rotation speed value monitoring point, and specifically may be obtained through measurement of a rotation speed sensor arranged at the rotation speed monitoring point.
The frequency value of the generator is related to the speed value, and can be expressed as n-60 f/p. Where n represents the rotational speed, f represents the frequency, and p represents the pole pair number of the generator. Since the pole pair number of the generator is always a constant value, the rotation speed is theoretically proportional to the frequency. However, in practical applications, the measured values often have certain errors, so that the frequency modulation control is inaccurate. In the solution provided in this embodiment, the actual frequency value of the target generator may be determined according to the frequency signal at the generator outlet, which may be measured by one or more source devices.
S12: and respectively determining a first rotating speed deviation value and a frequency deviation value according to the actual rotating speed value and the actual frequency value, wherein the first rotating speed deviation value is an absolute value of the difference between the rated rotating speed value and the actual rotating speed value of the target generator, and the frequency deviation value is an absolute value of the difference between the rated frequency value and the actual frequency value of the target generator.
In this step, a first rotational speed deviation value is determined according to the actual rotational speed value, and the first rotational speed deviation value may refer to a difference between the actual rotational speed value and the rated rotational speed value of the target generator. In addition, a frequency deviation value, which may refer to a difference between the actual frequency value of the target generator and the nominal frequency value, is determined based on the actual frequency value.
For example, the rated rotation speed of the generator in the domestic thermal power plant is 3000 rpm, and the first rotation speed deviation value is 3000-the actual rotation speed value. The rated frequency of the generator in the domestic thermal power plant is, for example, 50Hz, and the frequency deviation value is 50-the actual frequency value.
S13: and determining a second rotating speed deviation value corresponding to the frequency deviation value according to the preset corresponding relation between the rotating speed and the frequency of the target generator.
Typically, there is a linear correspondence between generator speed and generator frequency. Accordingly, the second rotational speed deviation value may be determined based on a preset correspondence of the rotational speed of the target generator to the frequency. For example, the frequency deviation value may be converted into a corresponding second rotational speed deviation value by a predetermined polygonal function generator. The parameters in the polyline function generator are, for example: X1-50Y 1-3000X 2-0Y 2-0X 3-50Y 3-3000.
S14: and when the difference value of the first rotating speed deviation value and the second rotating speed deviation value is larger than a preset deviation value, generating a frequency modulation control command according to the larger one of the first rotating speed deviation value and the second rotating speed deviation value so as to control the target generator to execute frequency modulation action.
In practical applications, the first rotation speed deviation value and the second rotation speed deviation value are obtained based on measured parameters, and the measured parameters often have certain errors. And when the difference value between the first rotating speed deviation value and the second rotating speed deviation value is larger than the preset deviation value, indicating that at least one parameter value in the monitored actual rotating speed value and the actual frequency value has an error. In the step, when the parameter value has an error, a frequency modulation control instruction is generated according to the larger of the first rotating speed deviation value and the second rotating speed deviation value, so that the effectiveness of frequency modulation control can be improved, and the target generator is adjusted to a normal working state as soon as possible and operates at a rated rotating speed and frequency.
The preset deviation value can be preset by a worker or can be automatically generated by the electronic equipment according to historical parameters. In practical applications, the rotation speed deviation value may also be referred to as slip, and the step may be implemented by generating a slip signal according to the slip and processing the slip signal. After the frequency modulation control instruction is generated, the rotating speed of the steam turbine can be controlled in a mode of controlling the size of a throttle of the steam turbine, and then the frequency modulation control of the target generator is achieved. For example, the frequency modulation control command generated by the above steps can be applied to the primary frequency modulation of the generator.
In addition, after the target generator is controlled to execute the frequency modulation action by the scheme provided by the embodiment of the application, the actual rotating speed value and the actual frequency value of the target generator may be continuously monitored, and if the actual rotating speed value of the target generator still deviates from the rated rotating speed value after the frequency modulation action is executed, or the actual frequency value of the target generator still deviates from the rated frequency value after the frequency modulation action is executed, the scheme provided by the embodiment of the application may be executed again until the monitored actual rotating speed value of the target generator is equal to the rated rotating speed value, and the monitored actual frequency value of the target generator is equal to the rated frequency value.
It should be noted that, since the measured value is often floated in practical applications, in order to avoid unnecessary frequency modulation control, the frequency modulation control may not be executed when the difference between the actual rotation speed value and the rated rotation speed value is small. For example, if the difference between the actual rotational speed value and the rated rotational speed value is within ± 1, the frequency modulation control is not executed. The frequency modulation control may not be performed if the difference between the actual frequency value and the nominal frequency value is within the allowable range.
In the embodiment of the application, the actual rotating speed value and the actual frequency value of the target generator are monitored; respectively determining a first rotating speed deviation value and a frequency deviation value according to the actual rotating speed value and the actual frequency value; determining a second rotating speed deviation value corresponding to the frequency deviation value according to a preset corresponding relation between the rotating speed and the frequency of the target generator; and when the difference value of the first rotating speed deviation value and the second rotating speed deviation value is larger than the preset deviation value, generating a frequency modulation control command according to the larger one of the first rotating speed deviation value and the second rotating speed deviation value so as to control the target generator to execute frequency modulation action. According to the scheme of the embodiment of the invention, the frequency modulation control instruction is generated by a relatively effective large numerical value according to the monitored actual rotating speed value and the actual frequency value, so that the frequency regulation effectiveness is effectively improved, and the safety of a power grid where the generator is positioned is further improved.
Based on the solution provided by the foregoing embodiment, optionally, step S11, as shown in fig. 2, includes:
s21: determining the actual rotating speed value according to the value obtained by at least one rotating speed monitoring point;
s22: and determining the actual frequency value according to the value obtained by at least one frequency monitoring point.
The number of the rotating speed monitoring points and the frequency monitoring points can be preset according to actual requirements. The actual rotating speed value and the actual frequency value of the target generator are monitored by a small number of monitoring points, so that the load can be reduced to a certain degree, the efficiency of generating instructions is improved, and the efficiency of frequency modulation control is further improved. The actual rotating speed value and the actual frequency value of the target generator are monitored by a large number of monitoring points, so that the precision of the monitored values can be improved, and the monitored parameters can accurately reflect the actual running state of the target generator. In addition, the above steps S21 and S22 may be performed simultaneously.
For example, three speed sensors may be preset to monitor the speed value of the target generator, and after the speed values collected by the three speed sensors are obtained, the actual speed value of the target generator may be determined by averaging, median, mode, and the like. In practical application, even if one rotating speed sensor fails, the fact that the monitored actual rotating speed value is consistent with the actual running condition of the target generator can be guaranteed, and therefore the generated frequency modulation control command can effectively control the target generator to execute frequency modulation action.
After step S13, the method further includes:
s23: and when the difference value between the first rotating speed deviation value and the second rotating speed deviation value is smaller than or equal to the preset deviation value and the number of the rotating speed monitoring points is larger than that of the frequency monitoring points, generating a frequency modulation control instruction containing the first rotating speed deviation value so as to control the target generator to execute frequency modulation action.
In this step, when the difference between the first rotational speed deviation value and the second rotational speed deviation value is less than or equal to the preset deviation value, it indicates that the operating state of the target generator reflected by the monitored actual rotational speed value is similar to the operating state of the target generator reflected by the monitored actual frequency value. The effect achieved by executing the frequency modulation action according to the first rotation speed deviation value or the second rotation speed deviation value is similar.
In the scheme provided by the embodiment of the application, the deviation value used for generating the frequency modulation control command is determined according to the number of the rotating speed monitoring points and the frequency monitoring points. Under the condition that the number of the rotating speed monitoring points is larger than that of the frequency monitoring points, the accuracy of the rotating speed values monitored by a plurality of rotating speed monitoring points is higher than that of the frequency values monitored by a small number of frequency monitoring points, so that a frequency modulation control instruction is generated according to a first rotating speed deviation value determined by an actual rotating speed value, and the effectiveness of frequency modulation control can be effectively improved. Compared with the frequency modulation control instruction generated according to the second rotating speed deviation value, the frequency modulation control instruction generated according to the embodiment of the application can more accurately execute frequency modulation control on the target generator.
Based on the solution provided by the foregoing embodiment, optionally, as shown in fig. 3, when the number of the rotation speed monitoring points is multiple, the foregoing step S21 includes:
s31: and determining the median of a plurality of numerical values obtained by a plurality of rotating speed monitoring points as the actual rotating speed value.
In the embodiment of the application, the numerical values obtained by the plurality of rotating speed monitoring points are arranged in a size sequence to form a number sequence, and the variable value in the middle position of the variable number sequence is called as the median. When the number of the variable value is odd, the variable value in the middle position is the median. When the number of the values obtained by the rotating speed monitoring points is even, the median is the average of 2 values in the middle position.
Through the scheme provided by the embodiment of the application, the determined actual rotating speed value can be in accordance with the actual working state of the target generator by utilizing the numerical values obtained by the plurality of rotating speed monitoring points. Compared with statistical characteristic values such as average number and mode number, the median can avoid the adverse effect of the invalid value obtained by damaging a certain rotating speed monitoring point on the actual rotating speed value. For example, assuming that the number of the rotation speed monitoring points is three, one of the rotation speed monitoring points is damaged, the obtained values are 0, 50 and 60 respectively, wherein 0 is an invalid value obtained by the damaged rotation speed monitoring point. The median of the three values is 50, and the average is about 36, so that the average cannot accurately reflect the actual working state of the target generator, and compared with the average, the median can more accurately reflect the working state of the target generator, thereby improving the effectiveness of the target generator in performing the frequency modulation action.
Based on the solution provided by the foregoing embodiment, as shown in fig. 4, before the foregoing step S14, optionally, the method further includes:
s41: and respectively determining the quality of the actual rotating speed value and the actual frequency value according to a preset numerical quality standard.
The numerical quality standard in the embodiment of the application can be preset according to requirements, and can also be automatically generated by electronic equipment according to historical parameters. The numerical quality criterion is used to determine the quality of the actual rotational speed value and the actual frequency value. For example, the numerical quality criteria can include a continuity criteria of the monitored values. And when the monitored numerical value has strong continuity, indicating that the monitored point operates normally. For example, the monitoring point periodically acquires parameters at intervals of 1 second, and if effective parameters can be acquired every second, the acquired parameter values can be determined to have high quality and meet the numerical quality standard.
In addition, the numerical quality standard may further include a preset numerical range, and when the acquired numerical value is within the preset numerical range, it is determined that the numerical value meets the numerical quality standard. Specifically, the numerical quality criterion may include a preset rotation speed range and a preset frequency range. And when the obtained actual rotating speed value is within the preset rotating speed range, determining that the actual rotating speed value has high quality and accords with the numerical quality standard. Similarly, when the obtained actual frequency value is within the preset frequency range, the actual frequency value is determined to have high quality and meet the numerical value quality standard.
Wherein, the step S14 includes:
s42: and generating a frequency modulation control instruction according to the quality of the actual rotating speed value and the actual frequency value and the larger one of the first rotating speed deviation value and the second rotating speed deviation value so as to control the target generator to execute frequency modulation action.
In the scheme provided by the embodiment of the application, the frequency modulation control instruction is generated by combining the quality and the value of the parameter value, so that the error operation of the frequency modulation control instruction generated due to the poor quality of the obtained actual rotating speed value and the actual frequency value is avoided. And further, the effectiveness of the generated frequency modulation control instruction is improved, and the target generator is accurately controlled to execute frequency modulation action.
Based on the solution provided in the foregoing embodiment, optionally, the preset numerical quality criterion includes a preset rotation speed quality criterion and a preset frequency quality criterion, where, as shown in fig. 5, the step S42 includes:
s51: and when the first rotating speed deviation value is larger than the second rotating speed deviation value and the quality of the actual rotating speed value meets a preset rotating speed quality standard, generating a frequency modulation control instruction containing the first rotating speed deviation value so as to control the target generator to execute frequency modulation action.
Because the first rotating speed deviation value is determined according to the actual rotating speed value, when the quality of the actual rotating speed value meets the preset rotating speed quality standard and the first rotating speed deviation value is larger than the second rotating speed deviation value, the first rotating speed deviation value can accurately reflect the running state of the target generator, and the target generator can be better controlled to execute frequency modulation action compared with the second rotating speed deviation value.
S52: and when the first rotating speed deviation value is smaller than the second rotating speed deviation value and the quality of the actual frequency value meets a preset frequency quality standard, generating a frequency modulation control instruction containing the second rotating speed deviation value so as to control the target generator to execute frequency modulation action.
Because the second rotating speed deviation value is determined according to the actual frequency value, when the quality of the actual frequency value meets the preset frequency quality standard and the second rotating speed deviation value is larger than the first rotating speed deviation value, the second rotating speed deviation value can accurately reflect the running state of the target generator, and the target generator can be better controlled to execute frequency modulation action compared with the first rotating speed deviation value.
According to the scheme provided by the embodiment of the application, the frequency modulation control instruction is generated according to the parameter value with the quality meeting the preset numerical value quality standard and the larger parameter value, the effectiveness of the control target generator in executing the frequency modulation action is improved, and the phenomenon that the frequency modulation control instruction is generated by the low-quality parameter value to cause wrong frequency modulation action is avoided.
Based on the solution provided by the above embodiment, optionally, as shown in fig. 6, the method further includes:
s61: and when one of the actual rotating speed value and the actual frequency value does not meet a preset numerical quality standard, generating a frequency modulation control instruction according to the value meeting the preset numerical quality standard so as to control the target generator to execute frequency modulation action.
In practical application, the monitoring point may acquire poor quality parameters. And if one of the collected actual rotating speed value and the actual frequency value does not meet the preset numerical value quality standard, generating a frequency modulation control command according to the numerical value meeting the preset numerical value quality standard. The value which does not meet the preset value quality standard may be caused by various reasons such as monitoring point faults, signal loss and the like, and the parameter with poor quality often cannot accurately reflect the actual operation state of the target generator. Therefore, in the scheme provided by the embodiment of the application, the frequency modulation control instruction is generated by adopting one numerical value meeting the preset numerical value quality standard, and the effectiveness of frequency modulation control execution is ensured.
Based on the solution provided by the foregoing embodiment, optionally, as shown in fig. 7, the method further includes:
s71: and when the actual rotating speed value and the actual frequency value do not meet the preset numerical value quality standard, generating rotating speed frequency alarm information.
If the obtained actual rotating speed value and the actual frequency value are both low in quality and do not meet the preset numerical quality standard, the actual rotating speed value and the actual frequency value may be caused by equipment faults in the system. At this time, the rotation speed frequency alarm information can be generated according to the actual rotation speed value and the actual frequency value. The fault reason can be preliminarily judged according to the actual rotating speed value and the actual frequency value, the rotating speed frequency warning information is generated according to the preliminarily judged fault reason, and then the rotating speed frequency warning information can be sent in the forms of sound, light and the like. Optionally, the target generator can be reminded in the forms of sending short messages, sending mails and the like to related personnel of the target generator so as to indicate the related personnel to check the fault of the target generator in time and improve the running safety of the generator.
The following illustrates the solution, and fig. 8 shows a logic diagram of the solution provided in the embodiment of the present application. The functions of the modules in fig. 8 are as follows:
broken line function generator: the coordinate points of X1-X8 and Y1-Y8 are set in the function generator in advance, and the output value is the Y point corresponding to the position of the X point in the coordinate where the input value falls. And determining a second rotational speed offset value corresponding to the frequency offset value.
A quality judgment block: when the input analog signal has a fault such as disconnection or over-range, the output of the quality determination block TQ becomes true to determine the quality of the acquired parameter.
An absolute value module: the output value is the absolute value of the value in the input signal.
A comparator: comparing the input of pin a with the input of pin B, a greater than, less than, equal to comparison can be performed, shown as a "greater than" comparator.
A deviation calculator: when the difference between the analog quantity a and the analog quantity B exceeds a set value, the output is true.
And gate: when both signals in the input are true the output is true.
Or gate: when any one of the signals in the input is true, the output is true.
NOT gate: the output value is the negation of the input signal, i.e., the true input is true and the false output is true.
A selector: when Z is true, output X1; when Z is false, the output is X2.
As shown in fig. 8, the rotation speed deviation value for generating the frequency modulation Control command is determined by a series of judgments and selections of the second rotation speed deviation value obtained by converting the first rotation speed deviation value and the generator frequency deviation value, and is used as a primary frequency modulation Control for the slip signal of the steam turbine Digital electro-Hydraulic Control System (DEH) and the Coordinated Control System (CCS), so as to obtain a better Control effect.
The slip signal acts on the CCS side and the DEH side simultaneously, and DEH may also be referred to as digital power modulation. As shown in fig. 9, the slip signal on the DEH side is converted into a "synthetic valve position increment" through an "unequal rate function 2" and is directly superimposed on a "synthetic valve position command" to open or close a turbine governor valve of a steam turbine so as to suppress the deviation of the rotating speed of the steam turbine from a rated value, the regulation of the part belongs to feed-forward regulation, the feed-forward regulation only outputs a fixed "synthetic valve position command" according to the change of the slip signal, and the power compensation cannot be accurately performed on the frequency change of the power grid, and belongs to coarse regulation. The slip signal acting on the CCS side is converted into a frequency modulation power fixed value and a power fixed value through an unequal rate function 1, the frequency modulation power fixed value and the power fixed value are superposed and then are compared with actual power, the compared value is regulated through a power controller, the compared value is superposed with a comprehensive valve position increment, a comprehensive valve position command is output to open or close a turbine regulating valve, the power regulating command cannot be continuously output only when the actual power is consistent with a target power command, and finally the rotating speed (power grid frequency) of the turbine is pulled back to a rated value.
For example, the rated rotation speed of the generator in the domestic thermal power plant is 3000 rpm, the actual slip signal is 3000-the measured rotation speed of the generator, the rated frequency of the generator in the domestic thermal power plant is 50Hz, and the frequency difference signal is 50-the measured frequency of the generator. The parameters in the polyline function generator are: X1-50Y 1-3000X 2-0Y 2-0X 3-50Y 3-3000.
For convenience of description, the first rotation speed deviation value will be referred to as an actual slip signal, and the second rotation speed deviation value will be referred to as a frequency-converted slip signal. When the "absolute value of the actual slip signal" is smaller than the "absolute value of the frequency-converted slip signal" and the "quality of the actual frequency value is high" and the "deviation between the absolute value of the actual slip signal and the absolute value of the frequency-converted slip signal is within ± 1", the selector outputs the "frequency-converted slip signal".
When the actual slip signal quality is low, the selector outputs a slip signal obtained by frequency conversion; otherwise, the selector outputs the actual slip signal.
And when the frequency difference between the actual slip signal and the generator is low in quality, the primary frequency modulation function is cut off, and audible and visual alarm is given.
The purpose of adopting the comparator in the logic is to select the amount of larger change between the 'frequency-converted slip signal' and the 'actual slip signal', so that the action value of the primary frequency modulation can better meet the requirement of a power grid, and the score of the double-fine rule is improved. The function of the logical deviation device is to allow the selector to output the 'actual slip signal absolute value' as the 'final slip signal' when the deviation between the 'frequency-converted slip signal absolute value' and the 'actual slip signal absolute value' is within +/-1, so as to prevent the malfunction of primary frequency modulation when the frequency signal is faulty or has poor accuracy. This is because the frequency signal in the control system is usually one monitoring point, and the rotation speed signal is usually three monitoring points, so the reliability of the rotation speed signal is higher than that of the frequency signal.
Through the scheme that this application embodiment provided, owing to adopted and confirmed second rotational speed deviation value and first rotational speed deviation value respectively by actual frequency value and actual rotational speed value, and then select more effectual rotational speed deviation value and generate the frequency modulation control command to can improve the frequency modulation action qualification rate, effectively guarantee the security of electric wire netting, also can increase the two fine rules of power plant income by a wide margin. In addition, parameters with good quality can be automatically selected to generate a frequency modulation control instruction when a monitoring point fails or a signal fails, so that the safety of the system is improved, and the control can be prevented from being executed by adopting a single signal. And when the difference between the first rotating speed deviation value and the second rotating speed deviation value is small, more reliable electrical parameters can be selected according to the number of monitoring points to claim a frequency modulation control command, and the reliability and the safety of frequency modulation control are improved.
In order to solve the problems in the prior art, an embodiment of the present application provides a generator frequency modulation control apparatus 100, as shown in fig. 10, including:
the monitoring module 101 is used for monitoring the actual rotating speed value and the actual frequency value of the target generator;
a first determining module 102, configured to determine a first rotational speed deviation value and a frequency deviation value according to the actual rotational speed value and the actual frequency value, where the first rotational speed deviation value is an absolute value of a difference between a rated rotational speed value of the target generator and the actual rotational speed value, and the frequency deviation value is an absolute value of a difference between a rated frequency value of the target generator and the actual frequency value;
the second determining module 103 is used for determining a second rotating speed deviation value corresponding to the frequency deviation value according to a preset corresponding relation between the rotating speed and the frequency of the target generator;
and the control module 104 is configured to generate a frequency modulation control command according to the greater of the first rotation speed deviation value and the second rotation speed deviation value when the difference between the first rotation speed deviation value and the second rotation speed deviation value is greater than a preset deviation value, so as to control the target generator to execute a frequency modulation action.
By the device provided by the embodiment of the application, the actual rotating speed value and the actual frequency value of the target generator are monitored; respectively determining a first rotating speed deviation value and a frequency deviation value according to the actual rotating speed value and the actual frequency value; determining a second rotating speed deviation value corresponding to the frequency deviation value according to a preset corresponding relation between the rotating speed and the frequency of the target generator; and when the difference value of the first rotating speed deviation value and the second rotating speed deviation value is larger than the preset deviation value, generating a frequency modulation control command according to the larger one of the first rotating speed deviation value and the second rotating speed deviation value so as to control the target generator to execute frequency modulation action. According to the scheme of the embodiment of the invention, the frequency modulation control instruction is generated by a relatively effective large numerical value according to the monitored actual rotating speed value and the actual frequency value, so that the frequency regulation effectiveness is effectively improved, and the safety of a power grid where the generator is positioned is further improved.
Preferably, an embodiment of the present invention further provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, where the computer program, when executed by the processor, implements each process of the above-mentioned embodiment of the generator frequency modulation control method, and can achieve the same technical effect, and details are not repeated here to avoid repetition.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the above-mentioned embodiment of the generator frequency modulation control method, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A generator frequency modulation control method is characterized by comprising the following steps:
monitoring an actual rotating speed value and an actual frequency value of a target generator;
respectively determining a first rotating speed deviation value and a frequency deviation value according to the actual rotating speed value and the actual frequency value, wherein the first rotating speed deviation value is an absolute value of the difference between the rated rotating speed value and the actual rotating speed value of the target generator, and the frequency deviation value is an absolute value of the difference between the rated frequency value and the actual frequency value of the target generator;
determining a second rotating speed deviation value corresponding to the frequency deviation value according to a preset corresponding relation between the rotating speed and the frequency of the target generator;
and when the difference value of the first rotating speed deviation value and the second rotating speed deviation value is larger than a preset deviation value, generating a frequency modulation control command according to the larger one of the first rotating speed deviation value and the second rotating speed deviation value so as to control the target generator to execute frequency modulation action.
2. The method of claim 1, wherein monitoring the actual speed value and the actual frequency value of the target generator comprises:
determining the actual rotating speed value according to the value obtained by at least one rotating speed monitoring point;
determining the actual frequency value according to the value obtained by at least one frequency monitoring point;
after determining a second rotation speed deviation value corresponding to the frequency deviation value according to a preset corresponding relationship between the rotation speed and the frequency of the target generator, the method further includes:
and when the difference value between the first rotating speed deviation value and the second rotating speed deviation value is smaller than or equal to the preset deviation value and the number of the rotating speed monitoring points is larger than that of the frequency monitoring points, generating a frequency modulation control instruction containing the first rotating speed deviation value so as to control the target generator to execute frequency modulation action.
3. The method of claim 2, wherein when the number of the rotation speed monitoring points is multiple, determining the actual rotation speed value according to the value obtained by at least one rotation speed monitoring point comprises:
and determining the median of a plurality of numerical values obtained by a plurality of rotating speed monitoring points as the actual rotating speed value.
4. A method according to any one of claims 1 to 3, further comprising, prior to generating a frequency modulation control command in response to the greater of the first and second speed deviation values:
respectively determining the quality of the actual rotating speed value and the actual frequency value according to a preset numerical quality standard;
wherein, according to the great one in first rotational speed discrepancy value and the second rotational speed discrepancy value generate frequency modulation control command to control the target generator and carry out frequency modulation action, include:
and generating a frequency modulation control instruction according to the quality of the actual rotating speed value and the actual frequency value and the larger one of the first rotating speed deviation value and the second rotating speed deviation value so as to control the target generator to execute frequency modulation action.
5. The method of claim 4, wherein the predetermined numerical quality criteria comprises a predetermined speed quality criteria and a predetermined frequency quality criteria, and wherein generating a frequency modulation control command to control the target generator to perform a frequency modulation action based on the greater of the quality of the actual speed value and the actual frequency value and the first speed deviation value and the second speed deviation value comprises:
when the first rotating speed deviation value is larger than the second rotating speed deviation value and the quality of the actual rotating speed value meets a preset rotating speed quality standard, generating a frequency modulation control instruction containing the first rotating speed deviation value so as to control the target generator to execute frequency modulation action;
and when the first rotating speed deviation value is smaller than the second rotating speed deviation value and the quality of the actual frequency value meets a preset frequency quality standard, generating a frequency modulation control instruction containing the second rotating speed deviation value so as to control the target generator to execute frequency modulation action.
6. The method of claim 4, further comprising:
and when one of the actual rotating speed value and the actual frequency value does not meet a preset numerical quality standard, generating a frequency modulation control instruction according to the value meeting the preset numerical quality standard so as to control the target generator to execute frequency modulation action.
7. The method of claim 4, further comprising:
and when the actual rotating speed value and the actual frequency value do not meet the preset numerical value quality standard, generating rotating speed frequency alarm information.
8. A generator frequency modulation control apparatus, comprising:
the monitoring module is used for monitoring the actual rotating speed value and the actual frequency value of the target generator;
the first determining module is used for respectively determining a first rotating speed deviation value and a frequency deviation value according to the actual rotating speed value and the actual frequency value, wherein the first rotating speed deviation value is an absolute value of a difference between a rated rotating speed value and the actual rotating speed value of the target generator, and the frequency deviation value is an absolute value of a difference between a rated frequency value and the actual frequency value of the target generator;
the second determining module is used for determining a second rotating speed deviation value corresponding to the frequency deviation value according to the preset corresponding relation between the rotating speed and the frequency of the target generator;
and the control module generates a frequency modulation control instruction according to the greater one of the first rotating speed deviation value and the second rotating speed deviation value when the difference value between the first rotating speed deviation value and the second rotating speed deviation value is greater than a preset deviation value so as to control the target generator to execute frequency modulation action.
9. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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