中国电机工程学报2017，Vol.37Issue(15)：4399-4407,9.DOI:10.13334/j.0258-8013.pcsee.161143
低电压穿越过程中DFIG型风电场同步稳定及无功电流控制方法
Synchronization Stability and Reactive Current Control Method of DFIG Wind Farm During Low Voltage Ride Through
摘要
Abstract
In grid code for wind power generation,wind farms are required to supply specified reactive current to support the recovery of the grid voltage during low voltage ride through (LVRT).Wind farms are usually required to be equipped with static synchronous compensator (STATCOM) by grid operators.In order to meet the requirements of LVRT,wind turbines and STATCOM usually use phase locked loop oriented current vector control method.However,wind farm output has a risk of losing synchronization with grid when severe voltage dip occurs because of the dynamic interaction between the phase locked loop (PLL) and current control.Based on doubly fed induction generator (DFIG) wind farm,this paper analyzes the mechanism and conditions of synchronization stability quantitatively,and finds that active current is indispensable.STATCOM must be assisted by DFIG because of having no active current output capacity,while considering the capacity of the converter,STATCOM must output enough reactive current to help DFIG to satisfy the grid code.Based on which,a coordinated current control method is proposed,which coordinates output active and reactive currents of wind farm according with impedance angle of transmission lines.Finally,the effectiveness of the theoretical analyses and the control method are verified by simulations.关键词
风电场/严重故障穿越/锁相环/阻抗角/静态无功补偿器/协同电流控制Key words
wind farm/severe fault ride through/phase locked loop (PLL)/impedance angle/STATCOM/coordinated current control分类
信息技术与安全科学引用本文复制引用
刘璐,耿华,马少康,朱国荣,刘钟淇..低电压穿越过程中DFIG型风电场同步稳定及无功电流控制方法[J].中国电机工程学报,2017,37(15):4399-4407,9.基金项目
国家重点研发计划(2016YFB0900302) （2016YFB0900302）
国家自然科学基金项目(U1510208).National Key Research and Development Program (2016YFB0900302) （U1510208）
Project Supported by National Natural Science Foundation of China (U1510208). （U1510208）
