考虑DFIG机组容量限制的风电场功率分配方法  

A power distribution method for a wind farm considering the limitations of rated capacity of DFIG units

作　　者：黄崇鑫[1] 张凯锋[1] 戴先中[1] 张冠虎[1] 

机构地区：[1]复杂工程系统测量与控制教育部重点实验室,东南大学自动化学院,江苏南京210096

出　　处：《电力系统保护与控制》2010年第21期202-207,214,共7页Power System Protection and Control

基　　金：国家自然科学基金项目(50507002,60974036);教育部博士点基金项目(20090092110020)~~

摘　　要：当风电场参与系统的有功无功控制时,它将面临如何将有功无功调度指令分配到底层风电机组的问题。针对DFIG风电场,介绍了DFIG的基本有功无功解耦控制框架。考虑到DFIG机组的额定容量限制,根据有功可能出力大的机组所分担的有功多,有功出力多的机组所分担的无功少这一原则,采用一种简单有效的风电场有功无功分配算法,可以合理利用各台机组的有功无功容量,减少视在功率饱和。在设计分配算法时,提出一种修正有功无功指令的方案,以消除因风电场内部有功无功损耗所引起的跟踪误差。利用Matlab/SimpowerSystems软件进行了仿真试验,仿真结果验证了该功率分配方法及修正指令方案的可行性。Wind farms confront the issue that how active and reactive power dispatching commands are distributed among the local wind power generators when participating in the active and reactive power control of a system.In view of a wind farm completely constituted by double fed induction generators（DFIG）,firstly,the basic frame of decoupling control of active and reactive power of a DFIG is introduced.Subsequently,according to the principle that the generator with more active power abilities shares more active power and the one with more active power production shares less reactive power,this paper adopts a simple and effective distribution algorithm of active and reactive power for a wind farm,considering the limitations of rated capacities of DFIG units.The distribution algorithm is capable of utilizing the active and reactive power capacity of GFIG reasonably and lessening the apparent power saturation.Moreover,in the process of designing the algorithm,a method of modifying active and reactive power reference signals is proposed to eliminate the tracking errors caused by the loss of active and reactive power in the wind farm.In the end,MATLAB/Simpower Systems software is employed to make simulation tests,and the results verify the feasibilities of the distribution strategy and the references modification method.

关 键 词：双馈感应电机 风电场 风力发电 有功无功分配 

分 类 号：TM614[电气工程—电力系统及自动化]