接入LCC-HVDC的双馈风电场孤岛启动与并网控制策略  

Startup and Integration Control Strategy of DFIG Based Isolated Wind Farm Connected with LCC-HVDC

作　　者：何秀强[1] 耿华[1] 杨耕[1] 邹欣 HE Xiuqiang;GENG Hua;YANG Geng;ZOU Xin(Department of Automation,Tsinghua University,Beijing 100084,China;State Grid Economic and Technological Research Institute Co.Ltd.,Beijing 102209,China)

机构地区：[1]清华大学自动化系,北京市100084 [2]国网经济技术研究院有限公司,北京市102209

出　　处：《电力系统自动化》2019年第9期99-107,124,共10页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(61722307);国网经济技术研究院有限公司资助项目(524408180001)~~

摘　　要：接入常规高压直流输电(LCC-HVDC)的双馈风电场系统,在直流送端无电压支撑的条件下无法孤岛启动,在传统并网控制方法下也无法稳定运行。为实现系统的孤岛启动及并网后的稳定运行,提出了一种接入LCC-HVDC的双馈风电场孤岛启动与并网控制策略,包括基于分布式储能的电路拓扑、孤岛启动的时序以及启动时序中每阶段系统的控制方法。在电路拓扑中,由配置于若干双馈风电机组变流器直流母线的储能为系统启动提供能量。基于此,风电机组采用空载启动方式,并网后风电机组采用基于无功功率的频率控制,直流系统采用基于有功功率的电压控制,两者共同维持送端交流母线电压及频率稳定。基于PSCAD/EMTDC的仿真结果表明,系统不仅能够顺利完成孤岛启动,而且在正常工况下电压和频率能够维持稳定,从而验证了所提孤岛启动与并网控制策略的有效性。Doubly-fed induction generator (DFIG) based wind farms with line-commutated converter based high voltage direct current (LCC-HVDC) integration are not able to startup as usual without voltage support on the sending-end AC bus.Besides,the whole system cannot operate stably with conventional control algorithms.This paper proposes a strategy for the system black startup and integration operation,which includes three critical parts: circuit topology based on distributed energy storage,startup sequence and control algorithm.In the circuit topology,the energy storage configured at the DC link of several wind turbine converters provide energy to startup the system.Thereby,the startup of DFIG based wind turbines is accomplished in the no-load startup mode.After integrated to the HVDC rectifier substation,the proposed reactive power based frequency control is applied into the wind turbine converters whereas the active power based voltage control is used in the HVDC rectifier,jointly maintaining both the voltage and frequency stability of the sending-end AC bus.The simulations on PSCAD/ EMTDC indicate that the black startup of the system can be realized successfully,and both the voltage and frequency stability under normal operating conditions can be maintained,which verifies the effectiveness of the proposed strategy.

关 键 词：风电场 电网换相换流器 高压直流输电 黑启动 并网 频率控制 电压控制 

分 类 号：TM614[电气工程—电力系统及自动化] TM73