采用H桥级联拓扑结构的大容量异步发电机静止励磁控制方法

An Approach to Control Static Excitation of High Power Induction Generator Using H-Bridge Cascaded Topology

针对大容量12/3相双绕组异步发电机的励磁控制要求,选用级联式2单元拓扑结构,提出了一种dq坐标系下的励磁控制方法。所提出的微调d分量对级联式无功补偿装置直流侧电容电压进行均压控制的方法可在不影响总输出电流的同时,对直流侧电容电压进行均压,相对于传统的移相均压控制方法,该方法实现了均压控制与励磁电流的完全解耦。理论分析和仿真结果验证了所提出方法的正确性。

According to the excitation requirement of 12/3 phase dual stator-winding induction generator （DWIG）, by use of cascaded converter with two-unit topology an excitation control approach under dq coordinate system is proposed. In accordance with the capacitor voltage equalization control at DC side, a capacitor voltage equalization control approach using fine adjustment of d component, which can implement equalization control of capacitor voltage while the amplitude and phase of total excitation current are not changed, is put forward. Differing from traditional phase-shifting voltage equalization control methods, the given approach realizes the complete decoupling of voltage equalization and excitation current. The results from theoretical analysis and simulation validate the correctness of the proposed method.