风电基地经特高压直流送出系统换相失败故障(三):送端风电机组暂态过电压抑制措施  

Commutation Failure of UHVDC System for Wind Farm Integration(Part Ⅲ):Transient Overvoltage Suppression Measures of Wind Powers in Sending Terminal Grid

作　　者：李光辉 王伟胜 何国庆 刘纯 LI Guanghui;WANG Weisheng;HE Guoqing;LIU Chun(State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems(China Electric Power Research Institute),Haidian District,Beijing 100192,China)

机构地区：[1]新能源与储能运行控制国家重点实验室(中国电力科学研究院有限公司),北京市海淀区100192

出　　处：《中国电机工程学报》2022年第14期5079-5088,共10页Proceedings of the CSEE

基　　金：国家电网公司科技项目:超高比例新能源送出特高压直流输电系统关键技术研究。

摘　　要：特高压直流(ultra high voltage direct current,UHVDC)换相失败故障引发送端风电机组暂态过电压,威胁风电机组的安全稳定运行,亟需对风电机组暂态过电压抑制措施开展研究。首先,该文结合系列文章第2篇风电机组暂态无功电压特性与作用机理分析,提出计及虚拟磁链的直驱风电机组(permanent magnet synchronous generator,PMSG)控制策略,以抑制机组在UHVDC换相失败故障下的暂态过电压。通过修正PMSG机组网侧变流器(grid side converter,GSC)电流环无功电流参考值,建立了计及虚拟磁链的机组暂态无功解析模型,并验证了模型的准确性;其次,综合考虑系列文章第2篇分析的电压分量暂态吸收无功功率特性,优化电压分量暂态无功控制器参数,实现PMSG机组暂态无功优化设计,提升机组在UHVDC换相失败故障中的暂态过电压抑制能力;最后,依托系列文章第1篇控制硬件在环实时仿真实验平台,验证了该文提出的计及虚拟磁链的PMSG暂态过电压抑制与参数优化方法的有效性。The fact that ultra high voltage direct current(UHVDC) transmission system commutation failure causes the transient overvoltage at the sending terminal grid has threatened the safe and stable operation of the wind turbine.It is urgent to conduct research on the transient overvoltage suppression measures.Combined with the analysis of the transient reactive power-voltage characteristics and mechanism of wind turbines in the second part of this series paper,this paper proposed a control strategy for permanent magnet synchronous generator(PMSG),considering the virtual magnetic flux to suppress the transient overvoltage under the condition of UHVDC commutation failure.By revising the reactive current reference value of current loop in the grid side converter(GSC) of PMSG,the analytical model of transient reactive power of PMSG with virtual flux was established,and the model’s accuracy was verified.Taking the transient characteristic of absorbing reactive power of the voltage component analyzed in the second part of the series papers into consideration,the transient reactive power was optimized by designing the controller parameters of the voltage component transient reactive power,the overvoltage suppression capability of PMSG under UHVDC commutation failure was improved.Based on the control hardware-in-the-loop(CHIL) real-time simulation platform in the first part of the series papers,the effectiveness of the transient overvoltage suppression and parameter optimization method considering the virtual flux for PMSG can be verified.

关 键 词：直驱风电机组 虚拟磁链 暂态无功优化 暂态过电压抑制 

分 类 号：TM72[电气工程—电力系统及自动化]