近似强开环模式谐振条件下风电场接入引发电力系统次同步振荡分析方法  

An Examination of SSOs Induced by Grid-Connected Wind Farms in Power Systems Under Near Strong Open-Loop Modal Resonance

作　　者：陈晨[1] 杜文娟[1] 王海风[1] CHEN Chen;DU Wenjuan;WANG Haifeng(State K.ey Laboratory of Alternate Electrical Power System With Renewable Energy Sources（North China Electric Power University）,Changping District,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)

出　　处：《电网技术》2018年第9期2778-2786,共9页Power System Technology

基　　金：国家重点研发计划项目(2016YFB0900602);国家电网公司科技项目(52094017000W)~~

摘　　要：研究了近似强开环模式谐振条件下风电场接入引发的电力系统次同步振荡。基于系统的闭环互联动态模型，将风电场和系统其余部分建模为两个开环子系统，论证了开环模式谐振和近似强模式谐振是相同的模式条件，并定义为近似强开环模式谐振。根据特征值灵敏度理论，提出了一种近似强开环模式谐振条件下，风电场接入引发电力系统次同步振荡问题的分析方法。分析表明，近似强开环模式谐振条件下风电场接入可能会导致系统发生负阻尼次同步振荡。最后，通过改进IEEE第一标准测试系统算例演示了所提分析方法，并对方法的有效性和有关结论的正确性进行了验证。This paper investigates the sub-synchronous oscillation（SSO） induced by grid-connected wind farms in power systems under the condition of near strong open-loop modal resonance. Based on closed-loop interconnected dynamic model of a power system, two open-loop subsystem models for wind farms and the rest of power system are established respectively. It is demonstrated that the open-loop modal resonance and the near strong modal resonance are the same modal condition, defined as near strong open-loop modal resonance. For the power system SSO issues caused by grid-connected wind farms under near strong open-loop modal resonance, an analysis method is proposed based on eigenvalue sensitivity theory. Analysis results show that negatively damped SSO may occur under near strong open-loop modal resonance. Furthermore, a modified IEEE first benchmark power system integrated with a wind farm is adopted to demonstrate the proposed analysis method, verifying effectiveness of the proposed method and correctness of corresponding conclusions.

关 键 词：次同步振荡 风电场接入 模式谐振 次同步相互作用 模式分析 

分 类 号：TM74[电气工程—电力系统及自动化]