基于PSCAD的双馈风电机组低压穿越控制策略

随着风电机组装机容量的不断增加,风电场并网规范对风电机组的运行要求越来越严格,要求具有外部电网故障下不脱网运行（低压穿越）的能力.为了研究双馈风电机组（DFIG）在低压穿越控制策略的优化方面提供有效的动态仿真与分析平台,并克服Matlab/Simulink仿真环境下所建模型在动态性能方面存在的不足,采用PSCAD仿真软件建立了双馈风电系统的动态仿真模型.通过分析电网对称故障时DFIG的暂态特性,并对转子电流与定子磁链的关系分析得出涉及定子磁链动态过程的改进矢量控制方案,配合转子侧Crowbar保护电路,并对网侧变流器进行有功和无功功率的解耦控制,从而使得电网对称故障时转子过电流、直流母线电压和转矩剧烈波动的情况得到了解决.

Study of Low Voltage Ride-Through Control Strategy of Doubly Fed Induction Generator Based on PSCAD

With the installed capacity of wind turbines increaseing,the wind farm grid wind turbine specification increasingly operational requirements,requiring an external power failure does not run off the network （Low Voltage Ride Through） capabilities.In order to study double-fed wind turbine （DFIG） at low pressure through optimizing control strategy to provide effective dynamic simulation and analysis platform,and to overcome the dynamic performance deficiencies under the Matlab/Simulink simulation environment,the PSCAD simulation software is used to established a doubly-fed wind power system dynamic simulation model.By analyzing symmetrical grid fault DFIG transient characteristics,and the rotor current and stator flux and using the rotor side Crowbar protection circuit,the grid side inverter control scheme is improved to achieve active and reactive power decoupling control,and the symmetrical grid fault rotor over current,DC bus voltage and torque volatile situation can be resolved.