一种新型的永磁直驱风力发电机组控制策略在微网中的应用

A NOVEL CONTROL STRATEGY OF PMSG BASED WIND TURBINES FOR MICRO-GRID APPLICATION

针对永磁直驱风力发电机组提出一种新型的控制策略。并网运行下采用最大功率跟踪控制;孤岛运行下网侧变流器作为电压源逆变器(VSI)运行,为微网提供稳定的电压频率,机侧变流器控制直流母线电压和定子电压的大小。同时针对新型控制策略下存在的转矩波动与运行模式切换的问题,分别设计阻尼控制器和无扰PI控制器。着重分析风电机组在孤岛运行下的稳定运行区域以及与蓄电池之间的协调控制。在DIg SILENT/Power Factory中建立仿真模型,对微网不同模式下的运行以及风速、负载变化下的响应进行仿真验证。仿真结果表明,新型控制策略在维持微网稳定的前提下,可减少蓄电池的容量和充放电次数。

With high penetration of wind energy in the micro-grid, this paper proposes a novel control strategy for permanent magnet synchronous generator based wind turbines to make full use of wind energy. In grid-connected operation, the wind turbine is regulated for maximum power point tracking. In islanded operation, the grid-side converter is controlled as voltage source inverters to provide stiff voltage and frequencyfor micro-grid, while the rotor-side converterstabilizes the DC bus and stator voltage. Aiming at the torsional oscillation and control mode transition, a damping controller and a bumpless PI controller were designed respectively. Deep analysis was also carried out on the stability operation area and coordinated control with the battery. Extensive simulations have been performed by using DIgSILENT/Power Factory. Simulation results demonstrated that the proposed control strategy can reduce the capacity demand and charge-discharge frequency of battery, in the meanwhile keep the micro-grid in stable.