考虑位置因素的风电次同步谐振阻尼特性与风机台数关系机理研究  

Research on Relationship of SSR Damping and DFIG Numbers Considering the Impact of DFIG Numbers and Locations

作　　者：江浩[1,2] 游静江 宁文元[1,2] 刘辉[1,2] 李雨[1,2] Jiang Hao You Jingjiang Ning Wenyuan Liu Hui Li Yu(State Grid Wind-Solar-Energy Storage Generation Laboratory,Beijing 100045 ,China State Grid Jibei Electric Power Co. Ltd. Research Institute,North China Electric Power Research Institute Co. Ltd., Beijing 100045, China North China Electric Power University, Beijing 102206, China)

机构地区：[1]国家电网公司风光储联合发电运行技术实验室,北京100045 [2]国网冀北电力有限公司电力科学研究院(华北电力科学研究院有限责任公司),北京100045 [3]华北电力大学电气与电子工程学院,北京102206

出　　处：《华北电力技术》2017年第3期14-22,共9页North China Electric Power

基　　金：国家电网公司科技项目(大型新能源基地经串补送出的运行特性与控制研究;52010116000S)资助

摘　　要：针对双馈风机接入串补系统引发的次同步谐振(Sub-synchronous resonance,SSR)问题,现有文献多研究单台风机经串补线路送出系统的次同步谐振特性,鲜有文献考虑系统次同步谐振特性与风机台数之间的关系。文章利用阻抗分析法,建立了风电-串补系统小信号阻抗模型,针对单一位置风场和不同位置风场,分别建立其风电-串补输电系统模型,利用阻抗稳定条件研究了2种情况下风电-串补系统次同步谐振阻尼特性与风机台数之间的关系。研究表明,对于单一位置风场,风电-串补系统的次同步谐振阻尼特性与风机台数之间既有可能为单调关系,也有可能为非线性关系;对于不同位置风场,风电-串补系统的次同步谐振阻尼特性与远近端风场风机台数的关系并不一致,远端风场风机台数增加,系统的次同步谐振阻尼特性逐渐改善;近端风场风机台数增加,系统的次同步谐振阻尼特性逐渐恶化,并利用RT-LAB仿真验证了分析的正确性。Sub-synchronous resonance （SSR） occurred in the power system with both Doubly Fed Induction Genera- tors （DFIGs） and series-compensated lines. Most of the existing papers mainly focus on the one DFIG with series- compensated system and seldom consider the relationship of SSR damping and the number of DFIGs. In this paper, the small-signal impedance model of the system with DFIG and series-compensated line is built. Then the system sta- bility condition is applied to analyze the relationship of SSR damping and the DFIG number. Results show that for wind farms in a single location, it is demonstrated that the relationship could be monotonic or nonlinear in case of dif- ferent series-compensated line parameters. For wind farms in different locations,the relationship between SSR damp- ing and DFIG number in different locations is not the same. The DFIG number increasing in farther wind farms has a positive impact on SSR damping while it has a negative impact in closer wind farms. Simulations on the RT-LAB plat- form prove the correctness of this paper.

关 键 词：次同步谐振(SSR) 双馈风力发电机 风电-串补系统 频率扫描 阻抗特性 

分 类 号：TM614[电气工程—电力系统及自动化] TM711