风机有功控制对系统暂态功角第二摆稳定性影响机理  

Influence Mechanism of Active Power Control of Wind Turbine Generators on Power System Transient Second Swing Stability

作　　者：董哲 周明 李庚银 李孟军 

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

出　　处：《中国电机工程学报》2017年第16期4680-4690,共11页Proceedings of the CSEE

基　　金：国家重点研发计划项目课题(2016YFB0900105);国家自然科学基金重大项目课题(51190103);国家电网公司科技项目(大型风电/光伏发电基地功率汇集与外送技术研究)~~

摘　　要：该文着重研究大规模集中并网的双馈风电基地故障后有功控制行为对系统暂态功角第二摆稳定性的影响机理。首先基于静态扩展等面积定则,对双馈感应式风机接入后系统的网络节点电压方程进行改进,构建适用于含风电多机系统暂态功角稳定性定量分析的等值单机无穷大系统模型;利用该模型对双馈风机与两台同步机互联的简化系统进行解析分析,分别给出风电并网系统暂态功角第二摆失稳的充分条件、必要条件,揭示出故障后风机有功出力低会降低第二摆稳定性;进一步分析风电并网系统中功角第二摆稳定性与第一摆稳定性的关系,从整体上揭示风机有功恢复速率变慢会使原本只会出现首摆失稳的系统发生第二摆失稳,并最终导致系统整体稳定性下降;最后对机理分析进行仿真验证。所做研究拓展了当前风电并网后只关注首摆失稳的暂态功角稳定性分析方法,为大规模风电集中并网电力系统暂态稳定控制提供理论指导。This paper aims to theoretically analyze the impact of post-fault active power control of centralized large-scale wind power base consisted of doubly-fed induction generators （DFIGs） on power system transient second swing stability. Based on the static extended equal area criterion, network node voltage equations of the system integrated with DFIGs were modified and one machine infinite bus model that is suitable for the multi-machine system integrated with wind power was built. By using the model, analytical calculations of two-machine system connected with DFIG were analyzed and the necessary and sufficient conditions for the transient second swing instability were proposed. It reveals that low post-fault active power of wind turbines has adverse effects on transient second swing stability. Then the interrelation between transient first swing stability and second one＇s of wind power integrated system was investigated. It reveals that as post-fault active power recovery speed of wind turbines gradually gets slower, the system which only had the possibility of first swing instability will have the possibility of second swing instability and it eventually decreases the entire system＇s transient angle stability. Simulation results show that the mechanism analysis is correct. The research extends the analysis method of transient angle stability of wind power integrated system that only focuses on transient first swing stability and provides theoretical guidance of transient stability control of power system integrated with wind power.

关 键 词：双馈风机 暂态功角稳定性 第二摆稳定性 静态扩展等面积定则 影响机理 

分 类 号：TM71[电气工程—电力系统及自动化]