静止同步补偿器与直驱永磁风机的次同步控制交互研究  

Analysis on Sub-Synchronous Control Interaction between Static Synchronous Compensator and Permanent Magnet Synchronous Generator

作　　者：任必兴 杜文娟 王海风 Ren Bixing;Du Wenjuan;Wang Haifeng(State Key Laboratory of Alternate Electric Power Systems with Renewable Energy Resources North China Electric Power University Beijing 102206 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

出　　处：《电工技术学报》2018年第24期5884-5896,共13页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划(2016YFB0900602);中央高校基本科研业务(2016XS09)资助项目

摘　　要：从开环模式谐振角度分析风电场中静止同步补偿器(STATCOM)与多台直驱永磁风机(PMSG)之间的次同步控制交互(SSCI)作用,详细推导并网STATCOM的开环线性化分析模型,并建立含STATCOM与多台PMSG的全系统的闭环线性化互联模型。当STATCOM控制参数调节不恰当时,其与PMSG会发生开环模式谐振,诱发次同步控制交互。基于残差理论,提出一项模式谐振估测指标,能够有效评估STATCOM与PMSG因开环模式谐振引起的SSCI影响。算例分析表明:当发生模式谐振时,STATCOM与PMSG之间的无功控制交互影响要远强于直流电压控制交互,可能引发剧烈的次同步振荡失稳,非线性时域仿真结果证明了理论分析的正确性;PMSG输出功率与模式谐振诱发的SSCI作用成正比,电气设备间距、电网强度与SSCI成反比;STATCOM恒电压控制比恒无功控制对系统稳定的威胁更大。This paper mainly investigates sub-synchronous control interaction(SSCI)caused by open-loop modal resonance between static synchronous compensator(STATCOM)and multiple permanent magnet synchronous generators(multi-PMSGs).The open-loop linearized analysis model of the STATCOM is derived,and the closed-loop interconnected dynamic model of the multi-PMSGs power system with a STATCOM is worked out.When the parameters of controllers of STATCOM are not properly turned,open-loop modal resonance may occur between STATCOM and PMSG,triggering the sub-synchronous control interaction.A new estimate index based on the residual theory is proposed to effectively evaluate the SSCI between STATCOM and PMSG caused by open-loop modal resonance.Case study shows that the reactive current control interaction between STATCOM and PMSG is much heavier than DC control interaction in the event of open-loop modal resonance,which may cause severe sub-synchronous oscillation instability.Nonlinear simulation verifies the correctness of the theoretical analysis.It is shown that the output power of PMSG is proportional to the SSCI caused by modal resonance,while the electrical equipment space and power grid strength are inversely proportional to the SSCI.In addition,constant voltage control is more threatening to system stability than constant reactive power control for the STATCOM.

关 键 词：静止同步补偿器 多台直驱永磁风机 次同步控制交互 开环模式谐振 估测指标 

分 类 号：TM712[电气工程—电力系统及自动化]