改进换相过程的SLCC拓扑及控制策略  

SLCC topology and control strategy for an improved commutation process

作　　者：丁瑞 邓雪凝 赵成勇 贾秀芳 申笑林 梁晨光 郭春义 DING Rui;DENG Xuening;ZHAO Chengyong;JIA Xiufang;SHEN Xiaoin;LIANG Chenguang;GUO Chunyi(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102211,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]国网经济技术研究院有限公司,北京102211

出　　处：《电力系统保护与控制》2024年第23期86-94,共9页Power System Protection and Control

基　　金：国家电网公司科技项目资助“适应于新能源送出的SLCC直流系统设计研究”(5200-202356128A-1-1-ZN);国家重点研发计划项目资助(2021YFB2400900)。

摘　　要：基于电网换相换流器的高压直流输电系统(line commutated converter based high voltage direct current,LCC-HVDC)可以广泛应用于远距离大容量的电力输送,但是其交流侧需要安装大量滤波设备和无功补偿装置,占地面积大且投切不灵活,制约了该方案的发展。针对该问题,阀侧并联静止同步补偿器(static synchronous compensator, STATCOM)的多源自适应换相换流器(self-adaption statcom and line commutation converter, SLCC)技术凭借其连续调节特性,可以实现无功功率的动态补偿。分析了SLCC的工作原理和换相过程,提出了一种兼顾无功补偿和谐波滤除的协调控制策略,引入无功补偿、谐波补偿、触发角补偿等环节,对无功功率和谐波电流进行动态跟踪处理。最后在PSCAD/EMTDC仿真平台中进行仿真验证。结果表明,所提控制策略可以实现系统的动态无功补偿和谐波精准滤除,加速了系统的换相过程,有效降低了无功消耗和投资成本。Line commutated converter-based high voltage direct current(LCC-HVDC)can be widely used in long-distance large-capacity power transmission,but its AC side requires the installation of a large amount of filtering equipment and reactive power compensation devices.This equipment occupies a large area and is not flexible,restricting the development of this scheme.To address this,self-adaption statcom and line commutation converter(SLCC)technology with a static synchronous compensator(STATCOM)in parallel on the valve side can achieve continuous regulation of reactive power by virtue of its continuous adjustment characteristics.This paper analyses the working principle and commutation process of SLCC,and proposes a coordinated control strategy that combines reactive power compensation and harmonic filtering,introducing reactive power,harmonic,and firing angle compensation and other links to dynamically track and process reactive power and harmonic current.Finally,simulation verification is carried out on the PSCAD/EMTDC platform.The results show that the proposed control strategy can achieve dynamic reactive power compensation and harmonic accurate filtering of the system,accelerate the commutation process,and effectively reduce reactive power consumption and investment cost.

关 键 词：高压直流输电 换相过程 SLCC STATCOM 动态无功补偿 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM761.12