锁相环控制对永磁直驱风机并网次同步振荡稳定性的影响——控制参数安全域  

Influence of PLL control on sub-synchronous oscillation stability ofgrid-connected PMSG:control parameter safety region

作　　者：任必兴 杜文娟 王海风 李海峰 赵静波 孙蓉 黄强 REN Bixing;DU Wenjuan;WANG Haifeng;LI Haifeng;ZHAO Jingbo;SUN Rong;HUANG Qiang(State Grid Jiangsu Electric Power Company Limited Research Institute,Nanjing 211103,China;College of Electrical Engineering,Sichuan University,Chengdu 610065,China;State Grid Jiangsu Electric Power Company Limited,Nanjing 210024,China)

机构地区：[1]国网江苏省电力有限公司电力科学研究院,江苏南京211103 [2]四川大学电气工程学院,四川成都610065 [3]国网江苏省电力有限公司,江苏南京210024

出　　处：《电力自动化设备》2020年第9期142-147,共6页Electric Power Automation Equipment

基　　金：国网江苏省电力有限公司科技项目(多电力电子变流器接入江苏电网引发宽频振荡风险评估及优化控制策略研究)(J2020129)。

摘　　要：主要从控制参数安全域的角度研究了锁相环(PLL)控制对并网永磁直驱风机(PMSG)次同步振荡稳定性的影响。基于所建立的全系统动态互联模型,通过特征值分析方法计算得到了PLL控制参数安全域。研究发现,参数安全域中出现的一系列"峰值点"主要是由模式谐振诱发的PLL与电压源型换流器(VSC)之间的强动态交互作用引起的,并通过非线性仿真验证了模式分析所得结论的正确性。进一步地,从PLL参数安全域的角度详细筛查了模式谐振诱发PMSG次同步振荡失稳的机理,分析了系统参数和VSC控制参数这2个因素对风电并网次同步振荡特性的影响。The impact of PLL(Phase Locked Loop)control on the sub-synchronous oscillation stability for grid-connected PMSG(Permanent Magnet Synchronous wind Generator)from the perspective of control parameter safety region is studied.Based on the established dynamic interconnection model of the general system,the parameter safety region of PLL is calculated using the eigenvalue method.It is found that a series of“peak points”appeared in the parameter safety region that are mainly due to strong dynamic interactions between the PLL and VSC(Voltage Source Converter)caused by modal resonance.This conclusion drawn from mode analysis is verified by nonlinear simulations.Moreover,from the new perspective of control parameter safety region for PLL,the instability mechanism of sub-synchronous oscillations of grid-connected PMSG is investigated in detail.The impacts of system parameters and VSC control parameters on the sub-synchronous oscillation characteristics of wind power grid-connected system are discussed.

关 键 词：锁相环 永磁直驱风机 次同步振荡 控制参数安全域 特征值分析方法 

分 类 号：TM614[电气工程—电力系统及自动化] TM46