双馈风力发电系统双PWM变换器的控制策略研究

Research on Dual PWM Converters for Doubly-fed Wind Power System

介绍了双馈风力发电系统的工作原理,采用双PWM变换器为双馈电机的励磁电源,详细讨论了双PWM变换器的控制策略,建立了基于S函数的转子侧控制器与网侧控制器的仿真模型。仿真结果表明,采用介绍的控制策略,可以实现功率解耦控制、最大风能追踪、变速恒频运行、并网高功率因数运行以及在工作状态切换时直流母线电压的稳定,同时验证了所建模型与控制策略的正确性。

The operation principle of doubly-fed wind power generation system was introduced,dual PWM converter was adopted as DFIG excitation power supply and its control strategy was discussed in detail, then the simulation model of rotor-side controller and grid-side controller was established based on S-function . The simulation results demonstrate that the model realizes the maximum wind energy tracking ,decoupling control of active and reactive power ,variable-speed constant-frequency（VSCF） ,ensures the stability of the DC voltage while working state switching and the high power factor operation . At the same time,the simulation confirms the correctness of the model and the control strategy.