摘要
近年来,在大规模风电集中接入电网系统中串补引起的次同步谐振问题引起了广泛关注,同时包含大量电力电子设备的高比例新能源系统使电网运行更为复杂。对双馈风机并网运行的振荡机理进行了分析,基于定转子转矩分析法提出一种转子侧双环阻尼控制器,为包含串补的双馈风机接入电网系统提供正阻尼,对可能产生的次同步谐振发挥抑制作用。同时提出一种双馈风电场次同步谐振的部分机组抑制策略,通过对一定比例的双馈风机装设阻尼控制器来抑制整个风电场的次同步谐振。在PSCAD上将风电场中的风机按照是否添加阻尼控制器分为两个群体,以不同功率输出比例的两台双馈风机来模拟,其中一台添加阻尼控制器,考察不同风况下该机组对次同步谐振的抑制作用。仿真结果表明:双馈风机转子侧双环阻尼控制器对次同步谐振具有较好的抑制作用,双馈风电场中一定比例的机组添加阻尼控制器对抑制整个风电场次同步谐振的策略是可行的。
Recently,subsynchronous resonance（ SSR） caused by the series compensation in large-scale wind energy connected to the grid attracted wide attention. And high-penetration renewable energy system which contains lots of power electronic equipment makes power grid operation more complex. The oscillation mechanism of the doubly-fed induction generator（ DFIG） connecting to the grid is analyzed,and a rotor – side double-loop damping controller is presented based on stator and rotor torque analysis. Then a positive damping for the series compensated system is provided to suppress the possible SSR phenomenon. Meanwhile,a strategy is proposed to suppress SSR of the DFIGbased wind farm by adding damping controllers to wind turbines in a certain proportion instead of all units. Based on PSCAD,an example is analyzed by dividing wind turbines in the wind farm into two groups which can be considered as two DFIGs of different power output ratios for simulation in accordance with whether adding damping controllers.Damping controller is added to one of the DFIGs to verify the proposed strategy in different wind speeds. The results show that the double-loop damping controller of RSC is effective. And it is feasible to suppress the SSR of the whole wind farm by adding damping controllers to wind turbines in a certain proportion.
作者
张家安
吴林林
赵凡
刘辉
Zhang Jia＇ an Wu Linlin Zhao FanI Liu Hui(School of Control Science and Engineering, Hebei University of Technology,Tianjin 300130, China State Grid Jibei Electric Power Co. Ltd. Research Institute, North China Electric Power Research Institute Co. Ltd.,Beijing 100045, China)
出处
《华北电力技术》
CAS
2017年第10期19-26,共8页
North China Electric Power
基金
国网冀北电力有限公司科技项目<高比例电力电子接口电源接入电网后引起的功率振荡问题机理及抑制措施研究>资助项目(52018K15000P)
关键词
双馈风电机组
次同步谐振
转矩分析法
双环阻尼控制器
doubly-fed induction generator （DFIG）, subsynchronous resonance （SSR）, torque analysis method,double-loop damping controller
