A Dynamic Reactive Power Control for DFIG Wind Turbines and Its Impacts on Distribution Protections  

作　　者：Li, Haifeng  Gao, Xiang  Wang, Gang  Wu, Zhengrong  Pan, Guoqing 

机构地区：[1] College of Electric Power, South China University of Technology, Guangzhou 510640, China

出　　处：《电力系统自动化》2012年第8期185-190,共6页Automation of Electric Power Systems

基　　金：supported by the National Basic Research Program of China(973Program)(No.2009CB219704);the Crucial Field and Key Breakthrough Project in "Guangdong-Hong Kong"(No.2009A091300011);Guangdong Special Fund Project of Industry,University and Research Institute Collaboration(No.2011A090200127,No.2011A090200074)

摘　　要：With the increasing penetration of distributed generations(DGs)into power grids,the fault ride-through ability of DG is attracting more and more attention.Recent grid codes require a DG to maintain its connection with the grid during grid faults and to play an active role in the recovery of grid voltage.This paper chooses the doublyfed induction generator(DFIG)as the typical wind turbine for study.Firstly,a dynamic reactive power control strategy is proposed to improve the fault ride-through characteristic of a DFIG.The contributions of a DFIG to the fault current under the dynamic reactive power control and the Crowbar control are analyzed and compared based on the mathematical expressions and control behaviors.The impacts of a DFIG under two control strategies on distribution protections are discussed.Studies show that although a DFIG under the dynamic reactive power control provides more fault current component than one under the Crowbar control,its impacts on distribution protections are acceptable.Finally,a 10kV distribution network with a DFIG is simulated in PowerFactory DIgSILENT.The simulation results prove the correctness of above theoretical analysis.With the increasing penetration of distributed generations （DGs） into power grids, the fault ride-through ability of DG is attracting more and more attention. Recent grid codes require a DG to maintain its connection with the grid during grid faults and to play an active role in the recovery of grid voltage. This paper chooses the doubly- fed induction generator （DFIG） as the typical wind turbine for study. Firstly, a dynamic reactive power control strategy is proposed to improve the fault ride-through characteristic of a DFIG. The contributions of a DFIG to the fault current under the dynamic reactive power control and the Crowbar control are analyzed and compared based on the mathematical expressions and control behaviors. The impacts of a DFIG under two control strategies on distribution protections are discussed. Studies show that although a DFIG under the dynamic reactive power control provides more fault current component than one under the Crowbar control, its impacts on distribution protections are acceptable. Finally, a 10 kV distribution network with a DFIG is simulated in PowerFactory DIgSILENT. The simulation results prove the correctness of above theoretical analysis.

关 键 词：双馈风力发电机 无功功率控制 配电保护 功率控制策略 双馈感应发电机 电网故障 风力发电机组 双馈电机 

分 类 号：TM315[电气工程—电机] TM714.3