LCC/VSC混联系统多区域间惯性支撑协调控制策略与仿真

doi:10.12204/j.issn.1000-7229.2022.05.012

电力建设 ›› 2022, Vol. 43 ›› Issue (5): 109-116.doi: 10.12204/j.issn.1000-7229.2022.05.012

LCC/VSC混联系统多区域间惯性支撑协调控制策略与仿真

雷霄¹(), 夏勇军², 杨尚瑾¹, 王薇薇¹, 陈堃², 李新年¹

1.中国电力科学研究院有限公司,北京市100192
2.国网湖北省电力有限公司电力科学研究院,武汉市 430077

收稿日期:2022-01-07 出版日期:2022-05-01 发布日期:2022-04-29
作者简介:雷霄(1985),男,硕士,高级工程师,研究方向为特高压直流输电技术与大电网仿真分析,E-mail: leixiao@epri.sgcc.com.cn。
夏勇军(1978),男,博士,教授级高级工程师,从事继电保护及自动化、高压直流输电控制保护技术等相关领域研究。
杨尚瑾(1987),男,高级工程师,研究方向为特高压直流输电技术与大电网仿真分析。
王薇薇(1986),女,高级工程师,研究方向为大电网仿真建模与仿真分析。
陈堃(1986),男,高级工程师,从事继电保护及自动化、高压直流输电控制保护技术等相关领域研究。
李新年(1977),男,博士,教授级高级工程师,研究方向为特高压直流输电技术与大电网仿真分析。
基金资助:
国家电网有限公司科技项目“VSC/LCC直流并联混合多馈的近区电网动态功率协调控制研究”(SGTYHT/19-JS-215)

Coordinated Control Strategy and Simulation of Multi-region Inertial Support for LCC/VSC Hybrid Infeed Power System

LEI Xiao¹(), XIA Yongjun², YANG Shangjin¹, WANG Weiwei¹, CHEN Kun², LI Xinnian¹

1. China Electric Power Research Institute, Beijing 100192, China
2. State Grid Hubei Electric Power Research Institute,Wuhan 430077,China

Received:2022-01-07 Online:2022-05-01 Published:2022-04-29
Supported by:
State Grid Corporation of China Research Program(SGTYHT/19-JS-215)

摘要/Abstract

摘要：

渝鄂背靠背柔直系统投运后实现了西南和华中异步联网,并形成了包括西南、华东、华中三峡机群、渝鄂、龙政、林枫等接入多类型直流的交直流混联系统。针对此种典型结构下交/直流故障后系统稳定需求,考虑充分发挥电压源换流器(voltage source converter,VSC)和电流源换流器(line commutation converter,LCC)快速可调的特性,提出了涉及交流线路、发电机组、VSC和LCC直流的惯性支撑协调控制系统。该系统的核心在于VSC/LCC的功率/频率协调控制策略,通过整定适应性的频率控制器逻辑和参数,以及执行直流间协同功率调制,能够实现直流对整个多区域混联系统的惯性支撑和辅助一次调频。建立了包含3区域交流电网以及VSC和LCC详细模型的电磁暂态仿真系统,仿真分析了可能引起失稳的典型交/直流故障。仿真结果表明,在惯性支撑协调控制策略的作用下系统能更快恢复至新的稳定运行状态,从而满足多区域间交直流电网动态功率协调控制的需求。

关键词: 电压源换流器(VSC), 电流源换流器(LCC), 混联系统, 惯性支撑, 频率控制

Abstract:

After the Yu-E back-to-back flexible direct current system was put into operation, the asynchronous interconnection of the Southwest and Central China power grids was realized, and an LCC/VSC hybrid infeed power system including the Southwest power grid and Three Gorges generators, VSC and LCC such as Longzheng HVDC was formed. Aiming at the system stability requirements after AC or DC failures under such a typical structure, this paper considers giving full play to the fast adjustable characteristics of VSC and LCC, and proposes a coordinated control system involving AC lines, generator sets, VSC and LCC. The core is the coordinated control strategy of inertial support of VSC/LCC, which can realize the inertia supporting and auxiliary frequency modulation of the entire hybrid system. An electromagnetic transient simulation system including three-region AC power grids and detailed models of VSC and LCC is established, and typical AC and DC faults that may cause instability have also been analyzed and simulated. Under the action of coordinated control strategies, the system can quickly recover to new stability operation status, so as to meet the needs of dynamic power coordinated control of AC/DC power grids in the near area.

Key words: voltage source converter(VSC), line commutation converter(LCC), hybrid infeed power system, inertial support, frequency control

中图分类号:

TM712

雷霄, 夏勇军, 杨尚瑾, 王薇薇, 陈堃, 李新年. LCC/VSC混联系统多区域间惯性支撑协调控制策略与仿真[J]. 电力建设, 2022, 43(5): 109-116.

LEI Xiao, XIA Yongjun, YANG Shangjin, WANG Weiwei, CHEN Kun, LI Xinnian. Coordinated Control Strategy and Simulation of Multi-region Inertial Support for LCC/VSC Hybrid Infeed Power System[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(5): 109-116.

图/表 6

图1 LCC/VSC混联系统电网结构

Fig.1 Network structure of LCC/VSC hybrid infeed power system

图2 混联系统等值模型

Fig.2 Equivalent model of hybrid infeed power system

图3 惯性支撑协调控制系统整体框架

Fig.3 Overall framework of coordinated control system for inertial support

图4 惯性支撑协调控制逻辑

Fig.4 Control logic of active power/frequency coordination

图5 惯性支撑协调控制策略仿真波形

Fig.5 Waveform of coordinated control strategy for inertia support

图6 LCC单极闭锁后系统频率仿真波形

Fig.6 Frequency Waveform of LCC monopole block

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LCC/VSC混联系统多区域间惯性支撑协调控制策略与仿真

Coordinated Control Strategy and Simulation of Multi-region Inertial Support for LCC/VSC Hybrid Infeed Power System

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