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针对永磁同步风力发电机加不控AC/DC和可控DC/AC结构,提出采用直流母线电压控制同时实现并网与最大风能跟踪。分析了可控DC/AC通过功率解耦控制直流母线电压的原理。提出采用可控DC/AC对直流电容充电的直接并网方法,并详细讨论了充电电流和限流电阻的取值范围。分析了直流母线电压与发电机转速之间的关系,提出采用直流电压变步长扰动代替转速定步长扰动实现最大风能跟踪,进一步提出采用功率变化量平方的比例值作为扰动值。详细的仿真验证了文中提出的控制策略简单、可行,适用于并网型永磁同步风力发电机。
Aimed at permanent magnet synchronous wind turbine generator with uncontrolled AC / DC and controllable DC / AC structure, it is proposed to adopt DC bus voltage control to realize grid connection and maximum wind energy tracking at the same time. The principle of controllable DC / AC DC link voltage through power decoupling is analyzed. A direct grid connection method of charging DC capacitor with controllable DC / AC is proposed. The range of charging current and current limiting resistor are discussed in detail. The relationship between DC bus voltage and generator speed is analyzed. It is proposed that the step-by-step disturbance of DC voltage step-change instead of speed step-by-step disturbance can be used to achieve maximum wind energy tracking. Proportional value of square of power variation is proposed as disturbance value. The detailed simulation verifies that the control strategy proposed in this paper is simple and feasible and suitable for the grid-connected permanent magnet synchronous wind power generator.