具有低电压穿越能力的双馈风电机组故障暂态特性分析  

Fault analysis of doubly fed induction generator wind turbines with low-voltage ride-through capability

作　　者：毕天姝 刘素梅 薛安成 杨奇逊 

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,北京102206

出　　处：《电力系统保护与控制》2013年第2期26-31,共6页Power System Protection and Control

基　　金：国家高技术研究发展计划(863计划)(2012AA050208);高等学校学科创新引智计划(B08013)~~

摘　　要：对目前广泛应用的双馈风电机组来说,其故障电磁暂态特性相对较复杂,不仅与发电机本身暂态特性有关,也与变换器相关控制与保护策略密切联系。已有双馈风电机组故障特性的分析多数基于较多假设条件,不足以全面评估和认识大量风电接入对电网故障特性的影响。基于典型并网控制和低电压穿越控制策略,在理论上推导了故障初始阶段Crowbar投入、故障发生一段时间后Crowbar切除且转子变换器控制作用以及故障期间Crowbar始终未投入等情况下双馈发电机的短路电流计算公式。同时,从定量仿真分析角度揭示了双馈风力发电机组在故障发生、切除全过程中的暂态响应特性。所得研究结论将能为大规模风电接入电网后现有保护适应性分析及其新原理研究提供较好的理论支撑。For the widely employed wind turbines with doubly fed induction generator （DFIG）, their fault behaviors are different from the ones of the traditional synchronous generators. The fault characteristics are not only related to the transient responses of DFIG, but to the control and protection schemes of the interfaced converters. However, the existing fault analyses are based on some ideal assumptions, and they are not enough to completely reveal the impacts of large-scale wind power penetration on the fault characteristics of the power grid. In this paper, the detailed wind turbine with DFIG model is firstly outlined including the typical integration and low-voltage ride-through （LVRT） control scheme. And then the short-circuit current expressions of DFIG with LVRT capability are derived at different time segment of a fault. Moreover, from the perspectives of quantitative analysis the transient fault response of the wind turbine with DFIG is clarified during the entire period from the occurrence of the faults to its clearance. The results are available for evaluating the adaptation of the existing protection schemes and developing the new protection principles.

关 键 词：双馈风力发电机 电磁暂态特性 短路电流 低电压穿越 风力发电 

分 类 号：TM315[电气工程—电机]