A phase regulator dynamic reactive power control method and system

Abstract

The present invention discloses a method and system for dynamic reactive power control of a phase regulator, and relates to the technical field of power systems. The method includes: modeling a power system, wherein the power system includes the following elements: a generator, a transmission line, and a load; collecting real-time data, wherein the real-time data includes impedance data, voltage data, and current data; calculating the reactive power of the power system through a power equation based on the modeling result and real-time data of the power system; determining the current reactive power demand of the power system through the calculation result of the reactive power of the power system; determining the dynamic reactive power control strategy of the phase regulator based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator. The present application realizes the improvement of the flexibility of configuring the dynamic reactive power control strategy of the phase regulator.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and more specifically, to a phase regulator dynamic reactive power control method and system. Background Art

[0002] The power system is a complex dynamic system that requires flexible and efficient control to maintain stable operation of the system. Reactive power control is one of the important issues in the power system. Traditional reactive power compensation equipment can no longer meet the dynamic demand for reactive power in the power system. With the continuous development of the power system and the large-scale access to clean energy, reactive power control of the power system has become increasingly important.

[0003] Traditional static reactive power compensation equipment can no longer meet the dynamic demand of power systems for reactive power. Therefore, it is necessary to study more flexible and efficient reactive power control methods. Phase regulators, as a new type of reactive power control equipment, have the advantages of high flexibility and fast response speed, and have been increasingly widely used in power systems. In other words, the research on dynamic reactive power control methods and systems for phase regulators has important theoretical and practical significance. Summary of the invention

[0004] The embodiments of the present application provide a phase regulator dynamic reactive power control method and system to solve the above technical problems.

[0005] The present application provides a method for dynamic reactive power control of a phase regulator, comprising: modeling an electric power system; wherein the electric power system comprises the following elements: a generator, a transmission line and a load; collecting real-time data, wherein the real-time data comprises impedance data, voltage data and current data; calculating the reactive power of the electric power system through a power equation based on the modeling result of the electric power system and the real-time data; determining the current reactive power demand of the electric power system through the calculation result of the reactive power of the electric power system; and determining the dynamic reactive power control strategy of the phase regulator based on the current reactive power demand of the electric power system and the steady-state reactive power of the phase regulator.

[0006] Furthermore, the dynamic reactive power control strategy includes the dynamic response speed, control algorithm, phase angle and amplitude of the output voltage of the phase regulator;

[0007] The reactive power P of the phase regulator during steady-state operation is calculated as sc The expression is:

[0008]

[0009] Among them, E q,sc is the q-axis electromotive force of the phase regulator; U t,sc is the terminal voltage of the phase regulator; Xd,sc is the d-axis synchronous reactance of the phase regulator; X q,sc is the q-axis synchronous reactance of the phase regulator; q sc is the power angle of the phase regulator during steady-state operation;

[0010] Wherein, the dynamic reactive power control strategy of the phase regulator is determined based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator, including: installing a preset number of the phase regulators in the power system; calculating the phase angle and amplitude of the estimated voltage of the power system with the preset number of phase regulators installed; calculating the first deviation between the phase angle of the estimated voltage and the phase angle of the target voltage; calculating the second deviation between the amplitude of the estimated voltage and the amplitude of the target voltage; using the first reactive amount corresponding to the first deviation and the second reactive amount corresponding to the second deviation as the output target voltage correction amount of the phase regulator; correcting the output target voltage of the phase regulator according to the output target voltage correction amount of the phase regulator and limiting the corrected output target voltage of the phase regulator; updating the output target voltage of the phase regulator; wherein, if the updated output target voltage needs to increase the output voltage of the phase regulator, the output target value of the phase regulator's forced reactive power is set using the following formula;

[0011] Q=(Sum-U)

[0012] Wherein, Q is the reactive reference value of the phase regulator strong excitation control target; Sum is the sum of the total amount of other components in the power system and the total amount of the phase regulator.

[0013] Further, the dynamic reactive power control strategy includes a dynamic response speed of the phase regulator, and after the output voltage target of the phase regulator is updated, the dynamic reactive power control strategy further includes: adding a preset signal S as the dynamic response speed of the phase regulator based on a dynamic response speed reference value of the phase regulator;

[0014] S=K×(P actul -P set )∫Vdt

[0015] Where P actul is the actual output power of the power system; P set is the rated power of the power system; V is the auxiliary variable; K is the proportional coefficient; K∈(0,1).

[0016] Furthermore, the control parameters of the phase regulator are adjusted and optimized through the real-time collected data, including: detecting the current reactive power of the power system, and if the current reactive power is lower than a preset power threshold, compensating based on the reactive power output by the phase regulator until the reactive power of the power system is equal to the preset power threshold.

[0017] Furthermore, after detecting the current reactive power of the electric power system, the method further comprises: if the current reactive power is higher than the preset power threshold, adjusting the phase regulator to operate at no load.

[0018] Furthermore, after determining the dynamic reactive power control strategy of the phase regulator, the method further includes: monitoring the operating status of the power system and the output of the phase regulator in real time, and adjusting and optimizing the control parameters of the phase regulator through real-time data; and performing system-level testing and verification on the power system integrated with the configured phase regulator, wherein the effectiveness and stability of the power system configured with the phase regulator are verified through testing of simulated scenarios and actual scenarios.

[0019] Furthermore, before calculating the reactive power of the power system using the power equation based on the modeling results of the power system and the impedance data, voltage data and current data collected in real time, the method also includes: identifying the parameters of the power system using a distributed and decentralized parameter identification algorithm, the parameters including impedance data, voltage data and current data.

[0020] The present application also provides a phase regulator dynamic reactive power control system, including a reactive power calculation unit and a control strategy design unit, wherein:

[0021] The reactive power calculation unit is used to model the power system; wherein the power system includes the following elements: a generator, a transmission line and a load;

[0022] The control strategy design unit is used to collect real-time data; and based on the modeling results of the power system and the real-time data, calculate the reactive power of the power system through the power equation; determine the current reactive power demand of the power system through the calculation result of the reactive power of the power system; based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator, determine the dynamic reactive power control strategy of the phase regulator; wherein the real-time data includes impedance data, voltage data and current data.

[0023] Furthermore, the phase modulator dynamic reactive power control system also includes: the real-time monitoring and adjustment unit, which is used to monitor the operating status of the power system and the output of the phase modulator in real time after determining the dynamic reactive power control strategy of the phase modulator, and adjust and optimize the control parameters of the phase modulator through the real-time collected data; the system integration and testing unit, which is used to perform system-level testing and verification on the power system integrated with the configured phase modulator.

[0024] Furthermore, the system integration and testing unit includes a scenario testing module, wherein the scenario testing module is used to verify the effectiveness and stability of the power system configured with the phase regulator through testing of simulated scenarios and actual scenarios.

[0025] Based on the embodiments provided by the present application, after the power system is modeled, real-time data is collected, and based on the modeling results and real-time data of the power system, the reactive power of the power system is calculated through the power equation; the current reactive power demand of the power system is determined through the calculation results of the reactive power of the power system; based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator, the dynamic reactive power control strategy of the phase regulator is determined. Thus, the dynamic reactive power control strategy of the phase regulator is determined based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator, and the accuracy and flexibility of the dynamic reactive power control strategy of the phase regulator is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 is a flow chart of an optional phase regulator dynamic reactive power control method according to an embodiment of the present application;

[0028] Figure 2 It is a structural diagram of an optional phase regulator dynamic reactive power control system according to an embodiment of the present application.

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0031] Alternatively, if Figure 1 As shown, the present application provides a phase regulator dynamic reactive power control method, comprising:

[0032] S101, modeling a power system; wherein the power system includes the following elements: a generator, a transmission line, and a load; collecting real-time data, the real-time data including impedance data, voltage data, and current data;

[0033] S102, calculating reactive power of the power system through a power equation based on the modeling results and real-time data of the power system;

[0034] S103, determining the current reactive power demand of the power system through the calculation result of the reactive power of the power system;

[0035] S104, determining a dynamic reactive power control strategy of the phase regulator based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator.

[0036] Based on the embodiments provided by the present application, after the power system is modeled, real-time data is collected, and based on the modeling results and real-time data of the power system, the reactive power of the power system is calculated through the power equation; the current reactive power demand of the power system is determined through the calculation results of the reactive power of the power system; based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator, the dynamic reactive power control strategy of the phase regulator is determined. Thus, the dynamic reactive power control strategy of the phase regulator is determined based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator, and the accuracy and flexibility of the dynamic reactive power control strategy of the phase regulator is improved.

[0037] Furthermore, the dynamic reactive power control strategy includes the dynamic response speed of the phase regulator, the control algorithm, the phase angle and the amplitude of the output voltage;

[0038] Among them, the reactive power P of the condenser during steady-state operation is calculated sc The expression is:

[0039]

[0040] Among them, E q,sc is the q-axis electromotive force of the phase regulator; U t,sc is the terminal voltage of the phase regulator; X d,sc is the d-axis synchronous reactance of the phase regulator; X q,sc is the q-axis synchronous reactance of the phase regulator; q sc is the power angle of the condenser during steady-state operation;

[0041] Wherein, based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator, determining the dynamic reactive power control strategy of the phase regulator includes: installing a preset number of phase regulators in the power system; calculating the phase angle and amplitude of the estimated voltage of the power system with the preset number of phase regulators installed; calculating the first deviation between the phase angle of the estimated voltage and the phase angle of the target voltage; calculating the second deviation between the amplitude of the estimated voltage and the amplitude of the target voltage; using the first reactive amount corresponding to the first deviation and the second reactive amount corresponding to the second deviation as the output target voltage correction amount of the phase regulator; correcting the output target voltage of the phase regulator according to the output target voltage correction amount of the phase regulator and limiting the corrected output target voltage of the phase regulator; updating the output target voltage of the phase regulator; wherein, if the updated output target voltage needs to increase the output voltage of the phase regulator, the output target value of the phase regulator's forced reactive power is set using the following formula;

[0042] Q=(Sum-U)

[0043] Among them, Q is the reactive reference value of the phase regulator’s forced excitation control target; Sum is the sum of the total amount of other components in the power system and the total amount of the phase regulator.

[0044] Further, the dynamic reactive power control strategy includes a dynamic response speed of the phase regulator. After the output target voltage of the phase regulator is updated, the dynamic reactive power control strategy further includes: adding a preset signal S as the dynamic response speed of the phase regulator based on a dynamic response speed reference value of the phase regulator;

[0045] S=K×(P actul -P set )∫Vdt

[0046] Where P actul is the actual output power of the power system; P set is the rated power of the power system; V is the auxiliary variable; K is the proportional coefficient; K∈(0,1).

[0047] Furthermore, the control parameters of the phase regulator are adjusted and optimized through the real-time collected data, including: detecting the current reactive power of the power system, and if the current reactive power is lower than the preset power threshold, compensating based on the reactive power output of the phase regulator until the reactive power of the power system is equal to the preset power threshold.

[0048] Furthermore, after detecting the current reactive power of the power system, the method further includes: if the current reactive power is higher than a preset power threshold, adjusting the phase regulator to operate at no load.

[0049] Furthermore, after determining the dynamic reactive power control strategy of the phase regulator, the method also includes: real-time monitoring of the operating status of the power system and the output of the phase regulator, adjusting and optimizing the control parameters of the phase regulator through real-time data; and performing system-level testing and verification on the power system integrated with the configured phase regulator, wherein the effectiveness and stability of the power system with the configured phase regulator are verified through testing of simulated scenarios and actual scenarios.

[0050] Furthermore, before calculating the reactive power of the power system using the power equation based on the modeling results of the power system and the impedance data, voltage data and current data collected in real time, the method also includes: using a distributed and decentralized parameter identification algorithm to identify the parameters of the power system, the parameters including impedance data, voltage data and current data. Optionally, Figure 2 As shown, the present application provides a phase regulator dynamic reactive power control system, including a reactive power calculation unit 201 and a control strategy design unit 202, wherein:

[0051] The reactive power calculation unit 201 is used to model the power system; wherein the power system includes the following elements: a generator, a transmission line and a load;

[0052] The control strategy design unit 202 is used to collect real-time data; and based on the modeling results and real-time data of the power system, calculate the reactive power of the power system through the power equation; determine the current reactive power demand of the power system through the calculation results of the reactive power of the power system; determine the dynamic reactive power control strategy of the phase regulator based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator; wherein the real-time data includes impedance data, voltage data and current data. Further, the phase regulator dynamic reactive power control system also includes: a real-time monitoring and adjustment unit, which is used to monitor the operating status of the power system and the output of the phase regulator in real time after determining the dynamic reactive power control strategy of the phase regulator, and adjust and optimize the control parameters of the phase regulator through the real-time collected data; a system integration and testing unit, which is used to perform system-level testing and verification on the power system integrated with the configured phase regulator.

[0053] Furthermore, the system integration and testing unit includes a scenario testing module, wherein the scenario testing module is used to verify the effectiveness and stability of the power system configured with the phase regulator through testing of simulated scenarios and actual scenarios. Based on the embodiment provided in the present application, after the power system is modeled, real-time data is collected, and the reactive power of the power system is calculated through the power equation based on the modeling results and real-time data of the power system; the current reactive power demand of the power system is determined through the calculation results of the reactive power of the power system; based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator, the dynamic reactive power control strategy of the phase regulator is determined. Thereby, the dynamic reactive power control strategy of the phase regulator is determined based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator, and the accuracy and flexibility of the dynamic reactive power control strategy of the phase regulator is improved.

[0054] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for dynamic reactive power control of a phase regulator, characterized in that: include: Modeling an electric power system; wherein the electric power system includes the following elements: a generator, a transmission line, and a load; Collecting real-time data, the real-time data including impedance data, voltage data and current data; Based on the modeling result of the power system and the real-time data, calculating the reactive power of the power system by a power equation; Determining the current reactive power demand of the power system through the calculation result of the reactive power of the power system; Determining a dynamic reactive power control strategy of the phase regulator based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator; The dynamic reactive power control strategy includes the dynamic response speed, control algorithm, phase angle and amplitude of the output voltage of the phase regulator; The reactive power P of the phase regulator during steady-state operation is calculated as sc The expression is: Among them, E q,sc is the q-axis electromotive force of the phase regulator; U t,sc is the terminal voltage of the phase regulator; X d,sc is the d-axis synchronous reactance of the phase regulator; X q,sc is the q-axis synchronous reactance of the phase regulator; q sc is the power angle of the phase regulator during steady-state operation; Wherein, determining the dynamic reactive power control strategy of the phase regulator based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator includes: Installing a preset number of said phase regulators in said power system; Calculating the phase angle and amplitude of the estimated voltage of the power system in which the preset number of phase regulators are installed; Calculating a first deviation between a phase angle of the estimated voltage and a phase angle of a target voltage; calculating a second deviation between an amplitude of the estimated voltage and an amplitude of the target voltage; using a first reactive amount corresponding to the first deviation and a second reactive amount corresponding to the second deviation as an output target voltage correction amount of the phase regulator; Correcting the output target voltage of the phase regulator according to the output target voltage correction amount of the phase regulator and performing a limit processing on the corrected output target voltage of the phase regulator; and updating the output target voltage of the phase regulator; If the updated output target voltage needs to increase the output voltage of the phase regulator, the output target value of the phase regulator's forced reactive power is set using the following formula: Q=(Sum-U) Wherein, Q is the reactive reference value of the phase regulator strong excitation control target; Sum is the sum of the total amount of other components in the power system and the total amount of the phase regulator.

2. The phase regulator dynamic reactive power control method according to claim 1, characterized in that: The dynamic reactive power control strategy includes the dynamic response speed of the phase regulator. After the output target voltage of the phase regulator is updated, the dynamic reactive power control strategy further includes: Adding a preset signal S as the dynamic response speed of the phase regulator based on the reference value of the dynamic response speed of the phase regulator; S=K×(P actul -P set )∫Vdt Where P actul is the actual output power of the power system; P set is the rated power of the power system; V is the auxiliary variable; K is the proportional coefficient; K∈(0,1).

3. The method for dynamic reactive power control of a phase regulator according to claim 2, characterized in that: The control parameters of the phase regulator are adjusted and optimized through real-time collected data, including: The current reactive power of the power system is detected. If the current reactive power is lower than a preset power threshold, compensation is performed based on the reactive power output by the phase regulator until the reactive power of the power system is equal to the preset power threshold.

4. The method for dynamic reactive power control of a phase regulator according to claim 3, characterized in that: After detecting the current reactive power of the power system, the method further includes: If the current reactive power is higher than the preset power threshold, the phase regulator is adjusted to operate at no-load.

5. The method for dynamic reactive power control of a phase regulator according to claim 4, characterized in that: After determining the dynamic reactive power control strategy of the phase regulator, the method further includes: Monitor the operating status of the power system and the output of the phase regulator in real time, and adjust and optimize the control parameters of the phase regulator through real-time data; Performing system-level testing and verification on the power system integrated with the configured phase regulator; The system-level testing and verification of the power system integrated with the phase regulator includes: verifying the effectiveness and stability of the power system integrated with the phase regulator through testing of simulated scenarios and actual scenarios.

6. The phase regulator dynamic reactive power control method according to claim 5, characterized in that: Before calculating the reactive power of the power system using a power equation based on the modeling result of the power system and the impedance data, voltage data, and current data collected in real time, the method further includes: The parameters of the power system are identified using a distributed and decentralized parameter identification algorithm, wherein the parameters include impedance data, voltage data, and current data.

7. A phase regulator dynamic reactive power control system, the system implements the method according to claim 1, characterized in that: It includes reactive power calculation unit and control strategy design unit, among which, The reactive power calculation unit is used to model the power system; wherein the power system includes the following elements: a generator, a transmission line and a load; The control strategy design unit is used to collect real-time data; and based on the modeling results of the power system and the real-time data, calculate the reactive power of the power system through the power equation; determine the current reactive power demand of the power system through the calculation result of the reactive power of the power system; based on the current reactive power demand of the power system and the steady-state reactive power of the phase regulator, determine the dynamic reactive power control strategy of the phase regulator; wherein the real-time data includes impedance data, voltage data and current data.

8. The phase modulator dynamic reactive power control system according to claim 7, characterized in that: The phase regulator dynamic reactive power control system also includes: A real-time monitoring and adjustment unit, for monitoring the operating state of the power system and the output of the phase regulator in real time after determining the dynamic reactive power control strategy of the phase regulator, and adjusting and optimizing the control parameters of the phase regulator through the real-time collected data; The system integration and testing unit is used to perform system-level testing and verification on the power system integrated with the configured phase regulator.

9. The phase modulator dynamic reactive power control system according to claim 8, characterized in that: The system integration and testing unit includes a scenario testing module, wherein: The scenario testing module is used to verify the effectiveness and stability of the power system configured with the phase regulator through testing of simulated scenarios and actual scenarios.

Images