多风电场–多机电力系统次同步振荡稳定性分析  

Stability Analysis of Subsynchronous Oscillation in Multi-machine Power System With Multiple Wind Farms

作　　者：王洋[1] 杜文娟[1] 王海风[1] WANG Yang;DU Wenjuan;WANG Haifeng(State Key Laboratory of Alternate Electric Power Systems with Renewable Energy Resources(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：《中国电机工程学报》2019年第22期6562-6571,共10页Proceedings of the CSEE

基　　金：国家电网公司科技项目(NYB17201800102);中央高校基本科研业务费(2018QN010)~~

摘　　要：多风电场–多机电力系统的互联模型是多输入多输出结构,该文将已有的单变量开环模式分析方法推广到多变量系统中,研究由多个风电场构成的子系统与多机电力系统之间的动态交互作用,从开环模式耦合条件的角度揭示多风电场–多机电力系统的次同步振荡机理。提出基于多维开环模式信息估计闭环模式的方法,并针对多风电场子系统的开环特性提出一种等价降阶的估计方法,最终形成多风电场–多机电力系统次同步振荡风险的评估体系。算例模型考虑了多个风电场的分散分布和风电场内风电机组的差异,分析了风电机组的数量、单机输出有功功率和风电场并网点对开环模式耦合的影响。非线性仿真结果验证了该文所提方法和分析结论的正确性。In a multi-machine power system with multiple wind farms,division of the power system into the wind farm subsystem and multi-machine power system subsystem results in a MIMO closed-loop model.Based on the SISO open-loop modal analysis,MIMO open-loop modal analysis was proposed to study the dynamic interaction between multiple wind farms subsystem and multi-machine power system.The mechanism of sub-synchronous oscillation in multi-machine power system with multiple wind farms was revealed from the perspective of open-loop modal coupling.Under the condition of open-loop modal coupling,an estimation method was proposed to predict the position of closed-loop modes based on the multi-dimensional open-loop modal information.Combining with the open-loop dynamic properties of multiple wind farms subsystem,the estimation method can be equivalently reduced.Then,the steps of risk assessment method for sub-synchronous oscillation were summarized.In addition,the distribution characteristics of wind farms and the differences between wind turbines in a wind farm were taken into account.And the effects of the number of wind turbines,output active power of single wind turbine,and the location of grid-connected point of wind farms on the open-loop modal coupling were studied.The results of non-linear simulation were presented to demonstrate analysis and conclusions made in the paper.

关 键 词：风电场 串联补偿 同步发电机 次同步振荡 开环模式分析 

分 类 号：TM712[电气工程—电力系统及自动化]