CN-122026705-A - Network-structured converter and oscillation energy dissipation controller, system, method, equipment and medium

CN122026705ACN 122026705 ACN122026705 ACN 122026705ACN-122026705-A

Abstract

The application provides a grid-built converter, an oscillation energy dissipation controller, a system, a method, equipment and a medium, and relates to the field of power conversion, wherein the oscillation energy dissipation controller comprises an oscillation energy calculation module, a parameter self-adaptive adjustment module, an oscillation energy dissipation controller switching module and an oscillation energy dissipation module; the system comprises an oscillation energy calculation module, an oscillation energy dissipation controller switching module, a parameter self-adaptive adjustment module, an additional control signal calculation module and a current loop controller, wherein the oscillation energy calculation module is used for calculating oscillation energy of a grid-built converter port to obtain an oscillation energy calculation result, the oscillation energy dissipation controller switching module is used for generating a controller switching signal according to the oscillation energy calculation result, the parameter self-adaptive adjustment module is used for generating a key control parameter according to the oscillation energy calculation result, and the oscillation energy dissipation module is used for calculating the additional control signal based on the controller switching signal and the key control parameter so that the current loop controller can regulate the oscillation energy dissipation characteristic of the grid-built converter port according to the additional control signal. The scheme has good oscillation energy dissipation capability and oscillation damping capability.

Inventors

WEI XINCHI
FANG CHEN
WANG WEIYU
YAN JUN
CHEN RAN
CAO YIJIA
LIU JINSONG
LIU SHU
YANG YILIN

Assignees

国网上海市电力公司
长沙理工大学
华东电力试验研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20251104

Claims (14)

1. An oscillating energy dissipation controller for a grid-tied converter, comprising at least: The oscillation energy calculation module is used for calculating the oscillation energy of the port of the grid-built converter, obtaining an oscillation energy calculation result and transmitting the oscillation energy calculation result to the switching module of the oscillation energy dissipation controller and the parameter self-adaptive module; The oscillation energy dissipation controller switching module is used for judging the damping performance of the grid-built converter according to the oscillation energy calculation result to generate a controller switching signal and transmitting the controller switching signal to the oscillation energy dissipation module; the parameter self-adaptive adjustment module is used for generating key control parameters according to the oscillation energy calculation result and transmitting the key control parameters to the oscillation energy dissipation module; the oscillation energy dissipation module is used for calculating an additional control signal based on the controller switching signal and the key control parameter and transmitting the additional control signal to the current loop controller so that the current loop controller regulates and controls the oscillation energy dissipation characteristic of the grid-built converter port according to the additional control signal.
2. The oscillation energy dissipation controller for a grid-tied converter according to claim 1, characterized in that said oscillation energy calculation module is specifically configured to: the method comprises the steps of obtaining a d-axis voltage component and a q-axis voltage component of a bus on the alternating current side of a grid-connected transformer, and a d-axis current component, a q-axis current component and a phase theta which are output by a grid-connected transformer port; and calculating the oscillation energy calculation result according to the d-axis voltage component, the q-axis voltage component, the phase theta, the d-axis current component and the q-axis current component.
3. The oscillating energy dissipation controller for a grid-tied converter of claim 1, wherein the critical control parameters include gain parameters of an oscillating energy dissipation module, and wherein the parameter adaptive adjustment module is specifically configured to: When the oscillation energy calculation result is larger than 0, obtaining a gain maximum value of an oscillation energy dissipation module, and calculating the gain parameter according to the gain maximum value and the oscillation energy calculation result; When the oscillation energy calculation result is not more than 0, the gain parameter is 1.
4. An oscillating energy dissipation controller for a grid-tied converter according to claim 3, characterized in that the oscillating energy dissipation controller switching module is specifically configured to: when the oscillation energy calculation result is larger than a preset threshold value, generating a controller switching signal with the value of 1; And when the oscillation energy calculation result is smaller than or equal to 0, generating a controller switching signal with the value of 0.
5. The oscillating energy dissipation controller for a grid-tied converter of claim 4, wherein said additional control signals comprise a d-axis additional control signal and a q-axis additional control signal; The oscillation energy dissipation module is specifically configured to: obtaining a measured value and a rated value of the target frequency of the alternating current side of the grid-structured converter; The d-axis additional control signal is obtained according to the controller switching signal, the gain parameter, the d-axis current component, the measured value and the rated value, and the q-axis additional control signal is generated according to the controller switching signal, the gain parameter, the q-axis current component, the measured value and the rated value.
6. A grid-connected converter comprising an oscillating energy dissipation controller and a current loop controller as claimed in any one of claims 1 to 5; the oscillation energy dissipation controller is used for calculating the oscillation energy of the port of the grid-built converter, generating an additional control signal and transmitting the additional control signal to the current loop controller; The current loop controller is used for regulating and controlling the oscillation energy dissipation characteristic of the grid-connected converter port according to the additional control signals, wherein the additional control signals comprise a d-axis additional control signal and a q-axis additional control signal.
7. The grid-tied converter according to claim 6, wherein the current loop controller is specifically configured to: Acquiring proportional and integral gain, d-axis current reference value, q-axis current reference value and grid-connected line inductance of the converter in a current control link; Generating a control instruction according to the proportional and integral gain, the d-axis current reference value, the q-axis current reference value, the converter grid-connected line inductance, the d-axis additional control signal and the q-axis additional control signal of the current control link; Based on the control instruction, the oscillation energy dissipation characteristic of the port of the network-structured converter is improved so as to effectively damp oscillation.
8. The grid-tied converter of claim 7, wherein said control commands include d-axis control commands and q-axis control commands; The current loop controller is specifically configured to: generating a d-axis control instruction according to the proportional and integral gain, the d-axis current component, the d-axis current reference value, the d-axis additional control signal, the measured value and the converter grid-connected line inductance of the current control link, and generating a q-axis control instruction according to the proportional and integral gain, the q-axis current component, the q-axis current reference value, the q-axis additional control signal, the measured value and the converter grid-connected line inductance of the current control link.
9. The grid-connected converter of claim 6, wherein the controller is configured to be turned on for a first predetermined time to perform oscillation suppression of different oscillation types after the grid-connected converter is applied to a distribution network test system and the system is excited to oscillate, wherein the oscillation types include a weak damping type and an oscillation instability type.
10. The grid-connected converter of claim 9, wherein the grid-connected converter is connected to a preset bus in the multi-node system after the grid-connected converter is applied to the multi-node system and excited to oscillate; When the oscillation type is a weak damping type, inputting the oscillation energy dissipation controller in the first preset time to perform oscillation suppression; And when the oscillation type is an oscillation instability type, inputting the oscillation energy dissipation controller for a first preset time so as to perform oscillation suppression.
11. A control system for a grid-connected converter, comprising a grid-connected converter as claimed in any one of claims 6-10.
12. A control method applied to an oscillating energy dissipation controller for a grid-tied converter according to any one of claims 1-5, the method comprising: calculating the oscillation energy sent or absorbed by the port of the network-structured converter to obtain an oscillation energy calculation result; judging the damping performance of the grid-built converter according to the oscillation energy calculation result to generate a controller switching signal, and generating key control parameters according to the oscillation energy calculation result; And calculating an additional control signal based on the controller switching signal and the key control parameter so as to regulate and control the oscillation energy dissipation characteristic of the grid-connected converter port through a current loop controller according to the additional control signal.
13. An electronic device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
14. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.

Description

Network-structured converter and oscillation energy dissipation controller, system, method, equipment and medium Technical Field The application relates to the technical field of power electronic conversion, in particular to a grid-structured converter, an oscillation energy dissipation controller, a system, a method, equipment and a medium. Background With the rapid development of the power electronic technology, devices such as a distributed power supply, an electric automobile load, an energy storage system and the like enter a brand new development stage of large-scale and wide-range access, and a complex operation pattern of cooperative interaction of source network and load storage is formed. Because of the rapid control characteristic, the power electronic converter is easy to present capacitive impedance and negative resistance near the harmonic frequency of the system in the operation process, and the intermittent and fluctuation of new energy power generation and electric automobile load are superposed, so that the system has high risk and multidimensional stability challenges, and a Grid Formation (GFM) converter control concept is generated. The grid-built converter can utilize a direct current bus to establish stable alternating current bus voltage based on alternating current-direct current conversion, has the external characteristics of a voltage source, can simulate the external characteristics of a synchronous machine, and provides vital voltage and frequency support for a weak power system. At present, although the grid-structured converter in the related art can provide voltage and frequency supporting capability for the power distribution network, due to the inherent oscillation characteristic, the problems of deterioration of the oscillation characteristic, expansion of the oscillation propagation range and the like of the power distribution network can occur, and further the power quality of the power distribution network is reduced. Disclosure of Invention The embodiment of the application provides a network-structured converter, an oscillation energy dissipation controller, a system, a method, equipment and a medium. In a first aspect of an embodiment of the present application, there is provided an oscillation energy dissipation controller for a grid-tied converter, comprising: The oscillation energy calculation module is used for calculating the oscillation energy of the port of the grid-built converter, obtaining an oscillation energy calculation result and transmitting the oscillation energy calculation result to the switching module of the oscillation energy dissipation controller and the parameter self-adaptive module; The oscillation energy dissipation controller switching module is used for judging the damping performance of the grid-built converter according to the oscillation energy calculation result to generate a controller switching signal and transmitting the controller switching signal to the oscillation energy dissipation module; the parameter self-adaptive adjustment module is used for generating key control parameters according to the oscillation energy calculation result and transmitting the key control parameters to the oscillation energy dissipation module; the oscillation energy dissipation module is used for calculating an additional control signal based on the controller switching signal and the key control parameter and transmitting the additional control signal to the current loop controller so that the current loop controller regulates and controls the oscillation energy dissipation characteristic of the network-structured converter port according to the additional control signal. In one embodiment, the oscillation energy calculation module is specifically configured to: the method comprises the steps of obtaining a d-axis voltage component and a q-axis voltage component of a bus on the alternating current side of a grid-connected transformer, and a d-axis current component, a q-axis current component and a phase theta which are output by a grid-connected transformer port; and calculating the oscillation energy calculation result according to the d-axis voltage component, the q-axis voltage component, the phase theta, the d-axis current component and the q-axis current component. In one embodiment, the key control parameters include gain parameters of the oscillation energy dissipation module, and the parameter adaptive adjustment module is specifically configured to: When the oscillation energy calculation result is larger than 0, obtaining a gain maximum value of an oscillation energy dissipation module, and calculating the gain parameter according to the gain maximum value and the oscillation energy calculation result; When the oscillation energy calculation result is not more than 0, the gain parameter is 1. In one embodiment, the oscillation energy dissipation controller switching module is specifically configured to: when the oscillation energy calcul