双馈风电系统低电压故障保护方法的研究  

Study on the Protection Method of Wind Turbine based on Double Fed Induction Generator in Low Voltages

作　　者：张梅[1] 李先允[2] 吉同舟[1] 王书征[2] 

机构地区：[1]南京师范大学电气与自动化学院,南京210042 [2]南京工程学院电力工程学院,南京211167

出　　处：《电气技术》2016年第6期51-55,61,共6页Electrical Engineering

基　　金：江苏省产学研前瞻性联合创新资助项目(BY2014009-003);南京工程学院校级科研基金项目(CKJ2009003)

摘　　要：提出一种基于串联动态制动电阻(SDBR)的低电压主动保护方法,在电网故障时吸收由于电网电压跌落引起的不平衡功率,保证故障期间双馈风电机组不脱网运行。分析SDBR对DFIG的暂态影响,提出SDBR的投切控制策略。根据低电压穿越(LVRT)规范对无功功率的要求,研究转子侧变流器无功补偿控制方式。利用PSCAD/EMTDC仿真平台,建立基于SDBR的双馈风电系统仿真模型,对三相对称故障时DFIG的低电压穿越能力进行仿真研究。仿真结果表明,串联动态制动电阻能够有效的抑制定、转子过电流,限制直流母线过电压,从而提高DFIG的低电压穿越能力,保证风电系统的不脱网运行。A new protection of inserts series dynamic brakingresistor （SDBR） is proposed. The SDBR dissipates the over-active power caused by the voltage drop to ensure uninterrupted operation of DFIG. The transient effect of DFIG was analyzed. The switching control strategy of SDBR via bus voltage stability domain was proposed. According to the Low Voltage fault through （LVRT） requirement for reactive power, the control of reactive power was researched. The simulation result in power system computer aided design and electromagnetic transient including （PSCAD/EMTDC） show that SDBR can effectively help to improve the terminal voltage of DFIG and limit the over-current of stator/rotor and the over-voltage of DC bus, which can improve the transient stability of DFIG in three-phase fault. It also proved that the SDBR guarantees the stable operation of wind power system.

关 键 词：双馈风电系统 低电压穿越 串联动态制动电阻(SDBR) 控制策略 无功补偿 

分 类 号：TM614[电气工程—电力系统及自动化]