CN-122000949-A - SVG connection reactor steady state of SLCC parameter determination method and system

CN122000949ACN 122000949 ACN122000949 ACN 122000949ACN-122000949-A

Abstract

The invention discloses a steady-state parameter determining method and a steady-state parameter determining system of an SVG (static var generator) connecting reactor of an SLCC (synchronous dynamic response), which are applied to the field of direct current transmission and comprise the steps of determining actual reactive power and intermediate parameters of the SVG based on an SLCC reactive power control target and initial parameters of the reactor; the SVG control method comprises the steps of determining SVG total output current and SVG total output voltage for obtaining a current margin coefficient based on an SVG harmonic control target, SVG actual reactive power and intermediate parameters, determining a voltage simulation result of an SVG connection reactor based on the current margin coefficient, and adjusting initial parameters of the reactor and returning to execute the steps if the updated voltage simulation result does not meet preset requirements after adjusting the SVG harmonic control target based on the voltage simulation result. According to the invention, the optimal reactor parameters are determined through equipment parameter calculation, simulation verification, feedback and closed loop adjustment, and the stability of the SLCC system and the accuracy of reactor parameter selection are improved while the SLCC system requirements are matched.

Inventors

WANG LING
LIANG CHENGUANG
JI YIMING
DU SHANGAN
HAO ZHIYUAN
GAO ZIJIAN
XU YING
SHEN XIAOLIN
WU FANGJIE
DU XIAOLEI
YANG PENGCHENG
WANG YU

Assignees

国网经济技术研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20260120

Claims (10)

1. A steady-state parameter determining method of an SVG (static var generator) connecting reactor of an SLCC (selective voltage-controlled loop) is characterized by comprising the following steps: Determining actual reactive power and intermediate parameters of the SVG based on the SLCC reactive power control target and the initial parameters of the reactor; Determining SVG total output current and SVG total output voltage for obtaining a current margin coefficient based on an SVG harmonic control target, the SVG actual reactive power and the intermediate parameter; Determining a voltage simulation result of the SVG connection reactor based on the current margin coefficient; and after the SVG harmonic control target is adjusted based on the voltage simulation result, if the updated voltage simulation result does not meet the preset requirement, adjusting the initial parameters of the reactor and returning to the step of determining the actual reactive power and the intermediate parameters of the SVG based on the SLCC reactive power control target and the initial parameters of the reactor.
2. The method for determining steady-state parameters of the SVG connection reactor of the SLCC according to claim 1, wherein determining the SVG total output current and the SVG total output voltage for obtaining the current margin coefficient based on the SVG harmonic control target, the SVG actual reactive power and the intermediate parameters includes: determining an SVG harmonic control target based on the SLCC topology; Determining SVG fundamental wave current based on the SVG actual reactive power and the intermediate parameter; determining SVG total output current and SVG total output voltage based on the SVG harmonic control target and the SVG fundamental current; and determining a current margin coefficient based on the initial parameters of the reactor, the SVG total output current and the SVG total output voltage.
3. The SVG connected reactor steady state parameter determination method of SLCC of claim 1, wherein said determining a voltage simulation result of the SVG connected reactor based on the current margin coefficient includes: If the current margin coefficient is not in the preset range, adjusting the initial parameters of the reactor and returning to the step of determining the actual reactive power and the intermediate parameters of the SVG based on the SLCC reactive power control target and the initial parameters of the reactor; and if the current margin coefficient is in the preset range, simulating the voltage of the SVG connected reactor based on the SLCC reactive power control target, the initial parameters of the reactor and the voltage simulation result is obtained.
4. The method for determining steady-state parameters of the SVG connected reactor of the SLCC according to claim 1, wherein after determining the voltage simulation result of the SVG connected reactor based on the current margin coefficient, the method comprises: under the condition that the voltage simulation result is that the simulation voltage meets the tolerance requirement of the SVG connection reactor, determining that the initial parameter of the reactor is a steady-state parameter of the SVG connection reactor; and under the condition that the voltage simulation result is that the simulation voltage does not meet the tolerance requirement of the SVG connection reactor, adjusting the SVG harmonic control target, and returning to the step of determining the SVG total output current and the SVG total output voltage for obtaining the current margin coefficient based on the SVG harmonic control target, the SVG actual reactive power and the intermediate parameter.
5. The SVG connected reactor steady state parameter determination method of SLCC of claim 4, wherein after adjusting the SVG harmonic control target based on the voltage simulation result, if the updated voltage simulation result does not meet the preset requirement, the step of adjusting the reactor initial parameter and returning to determining the SVG actual reactive and intermediate parameters based on the SLCC reactive control target and the reactor initial parameter includes: After adjusting the SVG harmonic control target based on the voltage simulation result, if the updated simulation voltage meets the tolerance requirement, determining the initial parameters of the reactor as steady-state parameters of the SVG connection reactor; and after the SVG harmonic control target is adjusted based on the voltage simulation result, if the updated simulation voltage does not meet the tolerance requirement, adjusting the initial parameters of the reactor, and returning to the step of determining the actual reactive power and the intermediate parameters of the SVG based on the SLCC reactive power control target and the initial parameters of the reactor.
6. An SVG connected reactor steady state parameter determination system for an SLCC, comprising: The SLCC system parameter determining module is used for determining actual reactive power and intermediate parameters of the static var generator SVG based on the SLCC reactive power control target of the cascading power grid converter and the initial parameters of the reactor; The SVG total output determining module is used for determining SVG total output current and SVG total output voltage for obtaining a current margin coefficient based on an SVG harmonic control target, the SVG actual reactive power and the intermediate parameter; The voltage simulation module is used for determining a voltage simulation result of the SVG connection reactor based on the current margin coefficient; And the reactor parameter adjustment module is used for adjusting the initial parameters of the reactor and returning to the step of determining the actual reactive power and the intermediate parameters of the SVG based on the SLCC reactive power control target and the initial parameters of the reactor if the updated voltage simulation result does not meet the preset requirement after the SVG harmonic control target is adjusted based on the voltage simulation result.
7. The SVG connected reactor steady state parameter determination system of SLCC of claim 6, wherein the SVG total output determination module includes: the SVG harmonic control target determining unit is used for determining an SVG harmonic control target based on the SLCC topological structure; The SVG fundamental wave current determining unit is used for determining SVG fundamental wave current based on the SVG actual reactive power and the intermediate parameter; the SVG total output determining unit is used for determining SVG total output current and SVG total output voltage based on the SVG harmonic control target and the SVG fundamental current; and the current margin coefficient determining unit is used for determining a current margin coefficient based on the initial parameters of the reactor, the SVG total output current and the SVG total output voltage.
8. The SVG connected reactor steady state parameter determination system of SLCC of claim 6, wherein the voltage simulation module includes: The reactor initial parameter adjusting unit is used for adjusting the reactor initial parameter and returning to the step of determining the actual reactive power and the intermediate parameter of the SVG based on the SLCC reactive power control target and the reactor initial parameter if the current margin coefficient is not in the preset range; and the voltage simulation unit is used for simulating the voltage of the SVG connected reactor based on the SLCC reactive power control target, the initial parameters of the reactor and the voltage of the SVG connected reactor if the current margin coefficient is in a preset range, so as to obtain a voltage simulation result.
9. The SVG connected reactor steady state parameter determination system of a SLCC of claim 6, further comprising: The steady-state parameter determining module is used for determining that the initial parameters of the reactor are steady-state parameters of the SVG connection reactor under the condition that the voltage simulation result shows that the simulation voltage meets the tolerance requirement of the SVG connection reactor; And the SVG harmonic control target adjusting module is used for adjusting the SVG harmonic control target and returning to the step of determining the SVG total output current and the SVG total output voltage for obtaining the current margin coefficient based on the SVG harmonic control target, the SVG actual reactive power and the intermediate parameter under the condition that the voltage simulation result is that the simulation voltage does not meet the tolerance requirement of the SVG connection reactor.
10. The SVG connected reactor steady state parameter determination system of SLCC of claim 9, wherein the reactor parameter adjustment module includes: The steady-state parameter determining unit is used for determining that the initial parameters of the reactor are steady-state parameters of the SVG connection reactor if the updated simulation voltage meets the tolerance requirement after the SVG harmonic control target is adjusted based on the voltage simulation result; and the reactor parameter adjusting unit is used for adjusting the initial parameters of the reactor and returning to the step of determining the actual reactive power and the intermediate parameters of the SVG based on the SLCC reactive power control target and the initial parameters of the reactor if the updated simulation voltage does not meet the tolerance requirement after adjusting the SVG harmonic control target based on the voltage simulation result.

Description

SVG connection reactor steady state of SLCC parameter determination method and system Technical Field The invention relates to the technical field of direct current transmission, in particular to a steady-state parameter determining method and system of an SVG (static var generator) connecting reactor of an SLCC (synchronous dynamic range controller). Background In an SLCC (SERIES LINE-Commutated Converter) dc power transmission system, an existing parameter selection method of an SVG (‌ STATIC VAR Generator, static var Generator) connected reactor is based on engineering experience, and the topological characteristics and the operation conditions of the SLCC dc power transmission system are not considered, which results in larger or smaller reactor parameters selected based on experience. The large reactor parameters can cause the reactive power regulation response speed of the SVG to be reduced, the dynamic reactive power requirement of the SLCC cannot be matched in time, even the system voltage stability is affected, the small reactor parameters are difficult to effectively inhibit transient current, the system harmonic loss is increased, and the damage of an internal switching device of the SVG due to overlarge current stress can be caused. Disclosure of Invention The invention provides a steady-state parameter determining method and system of an SVG (static var generator) connecting reactor of an SLCC (service level controller), which are used for solving the technical problem that the parameter selection of the SVG connecting reactor of the existing SLCC is inaccurate. In order to solve the above technical problems, an embodiment of the present invention provides a method for determining steady-state parameters of an SVG connection reactor of an SLCC, including: Determining actual reactive power and intermediate parameters of the SVG based on the SLCC reactive power control target and the initial parameters of the reactor; Determining SVG total output current and SVG total output voltage for obtaining a current margin coefficient based on an SVG harmonic control target, the SVG actual reactive power and the intermediate parameter; Determining a voltage simulation result of the SVG connection reactor based on the current margin coefficient; and after the SVG harmonic control target is adjusted based on the voltage simulation result, if the updated voltage simulation result does not meet the preset requirement, adjusting the initial parameters of the reactor and returning to the step of determining the actual reactive power and the intermediate parameters of the SVG based on the SLCC reactive power control target and the initial parameters of the reactor. As one preferable solution, the determining the SVG total output current and the SVG total output voltage for obtaining the current margin coefficient based on the SVG harmonic control target, the SVG actual reactive power and the intermediate parameter includes: determining an SVG harmonic control target based on the SLCC topology; Determining SVG fundamental wave current based on the SVG actual reactive power and the intermediate parameter; determining SVG total output current and SVG total output voltage based on the SVG harmonic control target and the SVG fundamental current; and determining a current margin coefficient based on the initial parameters of the reactor, the SVG total output current and the SVG total output voltage. As one preferable solution, the determining the voltage simulation result of the SVG connection reactor based on the current margin coefficient includes: If the current margin coefficient is not in the preset range, adjusting the initial parameters of the reactor and returning to the step of determining the actual reactive power and the intermediate parameters of the SVG based on the SLCC reactive power control target and the initial parameters of the reactor; and if the current margin coefficient is in the preset range, simulating the voltage of the SVG connected reactor based on the SLCC reactive power control target, the initial parameters of the reactor and the voltage simulation result is obtained. As one preferable solution, the determining the voltage simulation result of the SVG connection reactor based on the current margin coefficient includes: under the condition that the voltage simulation result is that the simulation voltage meets the tolerance requirement of the SVG connection reactor, determining that the initial parameter of the reactor is a steady-state parameter of the SVG connection reactor; and under the condition that the voltage simulation result is that the simulation voltage does not meet the tolerance requirement of the SVG connection reactor, adjusting the SVG harmonic control target, and returning to the step of determining the SVG total output current and the SVG total output voltage for obtaining the current margin coefficient based on the SVG harmonic control target, the SVG actual reactive po