CN111694348A - Method and device for testing power feedback performance of thermal power generating unit speed regulating system - Google Patents
Method and device for testing power feedback performance of thermal power generating unit speed regulating system Download PDFInfo
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- CN111694348A CN111694348A CN202010744648.5A CN202010744648A CN111694348A CN 111694348 A CN111694348 A CN 111694348A CN 202010744648 A CN202010744648 A CN 202010744648A CN 111694348 A CN111694348 A CN 111694348A
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Abstract
The invention relates to a method and a device for testing the power feedback performance of a speed regulating system of a thermal power generating unit, wherein the method comprises the steps of sequentially switching the speed regulating system to a valve control mode, a DEH power closed-loop control mode and a CCS control mode, carrying out + 2% and-2% voltage instruction step change in an excitation system in each operation mode of the speed regulating system, recording the response of the thermal power generating unit until the power oscillation of the thermal power generating unit is flat, obtaining the measured data of the power feedback performance of the speed regulating system of the thermal power generating unit, and carrying out verification by using the measured data, so that the accuracy of the model parameters of the speed regulating system can be improved. The method of the invention can further improve the field test method, carry out complete test on the characteristics of the power channel, and utilize the measured data to carry out verification, thus improving the accuracy of the model parameters of the speed regulating system.
Description
Technical Field
The application belongs to the technical field of automatic control of electric power systems, and particularly relates to a method and a device for testing power feedback performance of a speed regulating system of a thermal power generating unit.
Background
In recent years, the development of wind power, solar energy and water conservancy power generation is rapid. Due to the fact that the adjustability of the new energy is limited, the requirement for the adjusting performance of the power grid frequency when a traditional generator set operates is improved.
The influence of the primary frequency modulation capability of the unit on the power grid and users is increasingly important, the primary frequency modulation capability is the most basic and important content for guaranteeing the safety of the power grid, and the stability of the frequency of the power grid is influenced to a great extent. The primary frequency modulation of the thermal power generating unit takes frequency as input and takes a speed regulator instruction as output, and the method is widely applied to a turbo-generator unit.
Whether the primary frequency modulation works normally under the disturbance of the system frequency directly relates to whether the performance of the generator set reaches the standard, so that the performance of the primary frequency modulation of the generator set needs to be tested.
As shown in fig. 2, the existing thermal power generating unit speed regulation systems are both power and frequency dual-input signals, and conventional speed regulation system performance test methods are all used for testing by adding steps to frequency inputs, and cannot test the related performance of a power channel, so that the problem that the modeling result may be inaccurate exists.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method aims to solve the problems that in the prior art, all speed regulating system performance test methods are implemented by adding steps into frequency input, the related performance of a power channel cannot be tested, and a modeling result is possibly inaccurate.
In order to solve the technical problems, the invention provides a method and a device for testing the power feedback performance of a speed regulating system of a thermal power generating unit.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a method for testing power feedback performance of a thermal power generating unit speed regulating system, which comprises the following steps:
s1, switching the speed regulating system to a valve control mode, adding a set voltage step into an excitation system, and recording the response of the unit until the power oscillation of the unit is subsided;
s2, switching the speed regulating system to a DEH power closed-loop control mode, adding a set voltage step into an excitation system, and recording the response of the unit until the power oscillation of the unit is flat;
s3, switching the speed regulating system to a CCS control mode, adding a set voltage step into an excitation system, and recording the response of the unit until the power oscillation of the unit is flat;
s4, obtaining model parameters of the speed regulating system based on the identification method of adding step signals into frequency input;
and S5, according to the actual measurement data of the steps S1-S3, verifying, identifying and correcting the model parameters obtained in the step S5 until the simulation result is matched with the actual measurement result, and obtaining the model parameters of the speed regulating system, wherein the frequency channel and the power channel pass the verification.
The second aspect of the present invention provides a device for testing power feedback performance of a speed regulation system of a thermal power generating unit, including:
the first switching module is used for switching the speed regulating system to a valve control mode, adding a set voltage step into an excitation system, and recording the response of the unit until the power oscillation of the unit subsides;
the second switching module is used for switching the speed regulating system to a DEH power closed-loop control mode, adding a set voltage step into the excitation system, and recording the response of the unit until the power oscillation of the unit is subsided;
the third switching module is used for switching the speed regulating system to a CCS control mode, adding a set voltage step into the excitation system, and recording the response of the unit until the power oscillation of the unit is flat;
the parameter acquisition module is used for acquiring model parameters of the speed regulating system by an identification method of adding a step signal into frequency input;
and the parameter correction module is used for verifying, identifying and correcting the model parameters obtained in the step S4 according to the actually measured data in the steps S1-S3 until the simulation result is matched with the actually measured result, so as to obtain the speed regulating system model parameters of which the frequency channel and the power channel both pass the verification.
The invention has the beneficial effects that: the traditional method for testing and identifying the frequency input and adding the step signal has certain blank and defects in parameter testing of the power channel, the method provided by the invention can further perfect a field testing method, carry out complete testing on the characteristics of the power channel, and utilize the measured data to carry out verification, so that the accuracy of the model parameters of the speed regulating system can be improved.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
FIG. 1 is a frequency and power dual-input control schematic diagram of a thermal power generating unit speed regulating system;
FIG. 2 is a flow chart of a method of an embodiment of the present application;
FIG. 3 is a graph showing the frequency channel test results of the embodiment of the present application;
FIG. 4 is a graph showing the power channel test results of the embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
The embodiment provides a method for testing power feedback performance of a thermal power generating unit speed regulation system, as shown in fig. 2, the method includes:
s1, switching the speed regulating system to a valve control mode, adding + 2% and-2% voltage steps into the excitation system, and recording the response of the unit until the power oscillation of the unit subsides;
s2, switching the speed regulating system to a DEH (digital electro-hydraulic control system) power closed-loop control mode, adding + 2% and-2% voltage steps into an excitation system, and recording the response of the unit until the power oscillation of the unit is subsided;
s3, switching the speed regulating System to a CCS (Coordination Control System) Control mode, adding + 2% and-2% voltage steps into an excitation System, and recording the wave of the response of the unit until the power oscillation of the unit subsides;
s4, obtaining model parameters of the speed regulating system based on the identification method of adding step signals into frequency input;
and S5, according to the actual measurement data of the steps S1-S3, verifying, identifying and correcting the model parameters obtained in the step S4 until the simulation result is matched with the actual measurement result, and obtaining the model parameters of the speed regulating system, wherein the frequency channel and the power channel pass the verification.
In the embodiment, when the power feedback performance test is performed, the speed regulating system is sequentially switched to a valve control mode, a DEH power closed-loop control mode and a CCS control mode, and under each operation mode of the speed regulating system, the voltage command is stepped by + 2% and-2% in the excitation system, and the response of the thermal power generating unit is recorded until the power oscillation of the thermal power generating unit is settled, so that the measured data of the power feedback performance of the speed regulating system of the thermal power generating unit is obtained.
And then, obtaining model parameters of the speed regulating system by an identification method of adding a step signal into frequency input.
And finally, according to the obtained actual measurement data, verifying, identifying and correcting the model parameters of the speed regulation system until the simulation result is matched with the actual measurement result, and obtaining the model parameters of the speed regulation system, of which the frequency channel and the power channel pass the verification.
The invention can further improve the field test method, carry out complete test on the characteristics of the power channel, verify the model parameters of the speed regulating system by utilizing the measured data, and improve the accuracy of the model parameters of the speed regulating system. Fig. 4 is a graph of a power channel test result in a valve control mode and a power closed-loop control mode in which a certain unit is added with 2% voltage step, and fig. 3 is a graph of a frequency channel test result.
Further optionally, in this embodiment, before the power feedback performance test of the speed regulation system is performed, the test of adding the step signal through the frequency input is completed, and the stable operation of the unit is maintained.
Further optionally, this embodiment also includes, while maintaining the unit to operate stably:
and (3) confirming that the recording of parameters such as the rotating speed, the power, the total valve position instruction, the valve opening, the regulating stage pressure, the reheater pressure and the like of the unit is normal, and completing the preparation work of the voltage instruction step of the excitation system.
The method of the invention can further improve the field test method, carry out complete test on the characteristics of the power channel, and utilize the measured data to carry out verification, thus improving the accuracy of the model parameters of the speed regulating system.
Example 2:
the second aspect of the present invention provides a device for testing power feedback performance of a speed regulation system of a thermal power generating unit, including:
the first switching module is used for switching the speed regulating system to a valve control mode, adding a set voltage step into an excitation system, and recording the response of the unit until the power oscillation of the unit subsides;
the second switching module is used for switching the speed regulating system to a DEH power closed-loop control mode, adding a set voltage step into the excitation system, and recording the response of the unit until the power oscillation of the unit is subsided;
the third switching module is used for switching the speed regulating system to a CCS control mode, adding a set voltage step into the excitation system, and recording the response of the unit until the power oscillation of the unit is flat;
the parameter acquisition module is used for acquiring model parameters of the speed regulating system by an identification method of adding a step signal into frequency input;
and the parameter correction module is used for verifying, identifying and correcting the model parameters according to the measured data obtained by the first switching module, the second switching module and the third switching module until the simulation result is matched with the measured result, so as to obtain the model parameters of the speed regulating system, of which the frequency channel and the power channel pass the verification.
Please refer to embodiment 1 for a specific implementation of each module of the testing apparatus of this embodiment.
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (5)
1. A method for testing power feedback performance of a thermal power generating unit speed regulation system is characterized by comprising the following steps:
s1, switching the speed regulating system to a valve control mode, adding a set voltage step into an excitation system, and recording the response of the unit until the power oscillation of the unit is subsided;
s2, switching the speed regulating system to a DEH power closed-loop control mode, adding a set voltage step into an excitation system, and recording the response of the unit until the power oscillation of the unit is flat;
s3, switching the speed regulating system to a CCS control mode, adding a set voltage step into an excitation system, and recording the response of the unit until the power oscillation of the unit is flat;
s4, obtaining model parameters of the speed regulating system by an identification method of adding a step signal through frequency input;
and S5, according to the actual measurement data obtained in the steps S1-S3, verifying, identifying and correcting the model parameters obtained in the step S4 until the simulation result is matched with the actual measurement result, and obtaining the model parameters of the speed regulating system, wherein the frequency channel and the power channel pass the verification.
2. The method for testing the power feedback performance of the thermal power generating unit speed regulating system according to claim 1, wherein in the steps S1-S3, voltage steps of + 2% and-2% are added to the excitation system.
3. The method for testing the power feedback performance of the speed regulating system of the thermal power generating unit according to claim 1, wherein before the power feedback performance test of the speed regulating system, the test of adding the step signal through the frequency input is completed, and the stable operation of the thermal power generating unit is maintained.
4. The method for testing the power feedback performance of the thermal power generating unit speed regulating system according to claim 3, wherein the method further comprises the following steps of while keeping the unit stably running:
and confirming that the recording of parameters of the rotating speed, the power, the total valve position instruction, the valve opening, the regulating pressure and the reheater pressure of the unit is normal, and completing the preparation work of the voltage step instruction of the excitation system.
5. The utility model provides a testing arrangement of thermal power generating unit speed control system power feedback performance which characterized in that includes:
the first switching module is used for switching the speed regulating system to a valve control mode, adding a set voltage step into an excitation system, and recording the response of the unit until the power oscillation of the unit subsides;
the second switching module is used for switching the speed regulating system to a DEH power closed-loop control mode, adding a set voltage step into the excitation system, and recording the response of the unit until the power oscillation of the unit is subsided;
the third switching module is used for switching the speed regulating system to a CCS control mode, adding a set voltage step into the excitation system, and recording the response of the unit until the power oscillation of the unit is flat;
the parameter acquisition module is used for acquiring model parameters of the speed regulating system by an identification method of adding a step signal into frequency input;
and the parameter correction module is used for verifying, identifying and correcting the model parameters according to the measured data obtained by the first switching module, the second switching module and the third switching module until the simulation result is matched with the measured result, so as to obtain the model parameters of the speed regulating system, of which the frequency channel and the power channel pass the verification.
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