远海风电柔性直流送端交流系统故障协调控制  

Coordination Control for Sending End AC System Fault of Flexible DC Transmission Connected Offshore Wind Power

作　　者：彭忠[1,2] 黄海 叶荣 李泰 郝俊芳[1,2] PENG Zhong;HUANG Hai;YE Rong;LI Tai;HAO Junfang(XJ Group Corporation,Xuchang 461000,Henan Province,China;XJ Electric Co.,Ltd,Xuchang 461000,Henan Province,China;State Grid Fujian Electric Power Co.,Ltd.,Fuzhou 350003,Fujian Province,China;State Grid Fujian Economic Research Institute,Fuzhou 350003,Fujian Province,China)

机构地区：[1]许继集团有限公司,河南省许昌市461000 [2]许继电气股份有限公司,河南省许昌市461000 [3]国网福建省电力有限公司,福建省福州市350003 [4]国网福建省电力有限公司经济技术研究院,福建省福州市350003

出　　处：《全球能源互联网》2023年第6期628-639,共12页Journal of Global Energy Interconnection

基　　金：国家电网有限公司科技项目(SGFJJY00GHJS2000017)。

摘　　要：为提升远海风电对称双极柔性直流送端交流系统单相接地故障和两相短路故障工况(第一类故障)下的功率输送能力,以及三相接地故障工况(第二类故障)的交流电压稳定性,提出海上换流站协调控制策略。首先分析了第一类故障的过电压和极间环流产生机理,以及第二类故障的交流电压失稳机理。在此基础上,提出了功率平衡控制策略和输出有功电流策略。第一类故障下定电压控制极采用限压策略,功率平衡控制策略抑制极间环流,增大定电压控制极的功率,减少了交流电压控制器响应时间,提升了功率输送能力。第二类故障工况下,定电压控制极切换为交流电流控制模式,定功率控制极的输出有功电流策略抑制电压相量幅值和相位变化,解决了交流电压失稳的问题。最后,基于PSCAD/EMTDC搭建远海风电柔性直流送出系统仿真模型,仿真结果验证了所提控制策略有效性。In order to improve the power transmission capacity of symmetrical bipolar flexible DC under single phase to ground fault and phase to phase fault of AC system at sending end(type I fault),and the AC voltage stability under three phase to ground fault(type II fault),a coordinated control strategy of offshore converter station is proposed.Firstly,the generation mechanism of over voltage and inter pole circulation under type I fault,and the AC voltage instability mechanism under type II fault are analyzed.On this basis,the power balance control strategy and the output active current strategy are proposed.Under type I fault,the constant voltage control pole adopts the voltage limiting strategy,the power coordination control strategy suppresses the inter pole circulation,increases the power of the constant voltage control pole,reduces the AC voltage controller response time,and thus improves the power transmission capacity.Under type II fault,the constant voltage control pole is switched to the AC current control mode,the output active current strategy of the constant power control pole suppresses the amplitude and phase changes of the voltage phasor,and thus solves the problem of AC voltage instability.The simulation model of flexible DC transmission connected offshore wind power is built based on PSCAD/EMTDC,the effectiveness of the proposed control strategy is verified.

关 键 词：远海风电 柔性直流 交流系统故障 协调控制 

分 类 号：TM721[电气工程—电力系统及自动化]