适用于微网储能的变流器控制方法

Converter Control Method for Micro-Grid Energy Storage

针对提高微网储能变流器的动、静态性能,提出融合了前馈解耦控制的电网电压定向双闭环控制策略,在三相电压源型变流器(d,q)坐标系数学模型的基础上,以电网电压矢量定向并同步旋转,电流内环采用前馈解耦直接电流控制,解耦了有功电流与无功电流,提高了内环电流的跟踪速度与精度,同时加速了外环电压的响应速度。仿真结果表明,变流器系统响应速度快、网侧电流谐波含量低、直流侧电压稳定且纹波电压小,能以单位功率因数双向运行。提出的控制方法可行有效,具有应用参考价值。

In order to improve the static and dynamic performance of converter for micro-grid energy storage, a double closed-loop control method of feedforward decoupling and grid voltage oriented was proposed. This method used the mathematical model of three-phase voltage source converter in the （d, q ） coordinate system and basing on the synchronous rotation vector of grid voltage orientation. The inner current loop used feedforward decoupling direct current control method to decouple the active and reactive current. It improved the tracking speed and precision of the inner current loop, and also accelerated the response speed of the outer voltage loop. Simulation results show that the converter system has good response speed, low current harmonic, stable DC side voltage and small ripple voltage, and it also can work bidirectionally in unit power factor. So the control method is feasible and effective, and it has reference value for application.