中文摘要：

双向变换器具有功率双向流动、功率因数可调等优点,常作为双馈型风力发电机的励磁系统,当机侧的工作状况突变时,会引起直流侧电压较大的波动。为在稳定直流母线电压的前提下减少交—直—交变换器中电容容量,提出了内模解耦控制和负载功率前馈控制的复合控制方案,使前馈补偿量能抵消负载干扰量。分析和比较了小信号模型,在MATLAB/Simulink环境下建立无刷双馈发电机的仿真系统,仿真分析结果表明复合控制策略快速地实现了直流电压的稳定,极大改善了直流母线电压的控制效果,验证了控制方案的有效性和可行性。

英文摘要：

The back to back pulse width modulation converter has many advantages such as bidirectional power flow and adjustable power factor as AC-supply for doubly-fed wind power generator.When the generator-side converter working condition changes abruptly,the DC-link voltage will fluctuate significantly.To stabilize the dc bus voltage and decrease the capacitor capacity,a composite control scheme of both internal model decoupling control strategy and the load power feedforward control strategy is presented,in which the feedforward compensation can offset load disturbance.The design scheme is analyzed and compared in the small signal model and the simulation results in MATLAB/Simulink environment.It is verified that the composite control scheme can quickly realize DC voltage stability and greatly improve the control effect of the DC bus voltage.Theory and simulation prove the feasibility and effectiveness of the control scheme.