基于改进复转矩系数法的多风电场接入引发多机电力系统次同步振荡机理分析  

Analysis of Subsynchronous Oscillation in Multi-machine Power System Caused by the Integration of Multiple Wind Farms Based on Improved Complex Torque Coefficient Method

作　　者：王一珺 杜文娟 王海风 WANG Yijun;DU Wenjuan;WANG Haifeng(State Key Laboratory of Alternate Power Systems with New Energy Resources(North China Electric Power University),Changping District,Beijing 102206,China;School of Electric Engineering,Sichuan University,Chengdu 610065,Sichuan Province,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),北京市昌平区102206 [2]四川大学电气工程学院,四川省成都市610065

出　　处：《中国电机工程学报》2021年第7期2383-2394,共12页Proceedings of the CSEE

基　　金：国家自然科学基金项目(52077144)。

摘　　要：针对多风电场并网引发多机电力系统轴系次同步振荡问题,建立多风电场–多机电力系统开环互联模型,通过将多机电力系统内部拆分为轴系解耦的机械子系统和电气子系统,推导并网多风电场向同步机轴系注入的阻尼转矩,提出一种结合频域分析和模式分析思路的改进复转矩系数法,并给出相应的次同步振荡稳定性判断流程。在算例中采用所提方法从阻尼角度分析分散式多风电场与多机电力系统的动态交互过程,对影响轴系稳定性的风电场相关参数进行分析,指出风机控制参数、风机运行功率、风机台数及风电场并网位置的不合理均可能导致多机电力系统次同步振荡失稳,并通过非线性仿真验证分析结论的正确性。This paper investigated the torsional subsynchronous oscillations of multi-machine system caused by the integration of multiple wind farms.The open-loop interconnection model of multi-machine power system integrated with multiple wind farms was established,and the damping torque injected into the synchronous machine shaft system from grid-connected wind farms was calculated by dividing the multi-machine power system into decoupled mechanical subsystem and electrical subsystem.An improved complex torque coefficients method which combined the advantages of frequency domain analysis and modal analysis was proposed and the corresponding sub-synchronous oscillation stability judgment flow was presented.In the case studies,the dynamic interaction process between distributed multiple wind farms and multi-machine power system was analyzed from the perspective of damping mechanism based on the proposed method.The parameters of grid-connected wind farms affecting the stability of the shaft system were analyzed.It is found that the parameters of wind turbines,the operating power of wind turbines,the number of wind turbines and the unreasonable location of the wind farms may lead to the sub-synchronous oscillation instability of the multi-machine power system,and the correctness of the analysis conclusion was verified by nonlinear simulation.

关 键 词：多风电场 同步机轴系 复转矩系数法 次同步振荡 动态交互作用 

分 类 号：TM721[电气工程—电力系统及自动化]