DFIG无功/电压控制影响机电振荡模式的近似判定指标  

An Index to Determine the Effect of DFIG's Reactive Power/Terminal Voltage Control on Electromechanical Oscillation Modes

作　　者：杜文娟 陈骁 王海风 宋云亭[2] 王青[2] 丁剑[2] 陈得治[2] 魏巍[3] 

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]中国电力科学研究院 [3]国网四川省电力公司电力科学研究院,四川省成都市610000

出　　处：《中国电机工程学报》2017年第3期720-726,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51407068);国家电网公司科技项目(XT71-15-059)~~

摘　　要：并网风电场无功控制可以采用定无功功率或定端电压控制,其对电力系统小干扰功角稳定性的影响不同。该文针对等效为单台双馈感应发电机(doubly fed induction generator,DFIG)的风电场,提出了一种可以判定风电场采用定无功功率还是定端电压控制更加有利于电力系统小干扰功角稳定性的近似计算指标。指标的计算不需要获知风电场动态模型(包括定无功功率和定端电压控制器)的参数。这样,在规划风电场并网时,提出的指标可以指导其无功控制方式的选择,以使其更加有利于电力系统小干扰功角稳定性。文中给出了基于模式控制理论推导判定指标的详细过程,并通过一个算例电力系统,演示和验证了判定指标正确性。A grid-connected wind farm can adopt fixed reactive power output control or terminal voltage control. Effect of those two types of control on power system small-signal angular stability is different. In this paper, for a wind farm which is aggregated as a DFIG, an index is proposed to determine which type of control is more beneficial to system small-signal angular stability. Computation of the proposed index does not rely on the information of dynamic models of both the wind farm and reactive power/voltage controller. Hence the index can help the planning of grid connection of wind farms to choose the type of control in order to benefit system small-signal angular stability. In the paper, mathematical derivation of the proposed index is presented. An example power system is used to validate and demonstrate the application of the index in planning the grid connection of wind farms.

关 键 词：风电场规划 双馈感应风机(DFIG) 电力系统小干扰稳定性 机电振荡模式 

分 类 号：TM71[电气工程—电力系统及自动化] TM74