基于T型连接变压器的异步发电机稳压稳频控制

Voltage and Frequency Stabilizing Control of Induction Generator Based on T Type Connection Transformer

独立自励异步发电机的机端电压和频率会随着负载变化出现较大波动,为了稳定电压、频率以及改善发电机的电能质量,设计了基于T型连接变压器的异步发电机稳压稳频控制器。该控制器可直接将三相瞬时交流信号变换到dq坐标系再进行有功和无功的解耦,然后通过闭环反馈控制STATCOM对系统进行功率补偿。仿真结果表明:稳压稳频控制器通过控制STATCOM能有效地稳定机端电压和频率,提高了发电机的带载能力;T型连接变压器能平衡三相电压以及抑制谐波,适用于负载不平衡的供电系统。

Terminal voltage and frequency of isolated self-excited induction generator will appear large fluctuation along with the changing of load. In order to stabilize voltage and frequency and improve power quality of generator, the voltage and frequency stabilizing controller of induction generator based on T type connection transformer is designed. The controller can directly transform the three-phase transient AC signals to dq coordinates to decouple active and reactive power, and then reactive power is compensated by close loop feedback controlled STACOM. Simulation results show that the voltage and frequency stabilizing controller can effectively stabilize the terminal voltage and frequency by controlling STATCOM which improve the load bearing capacity of generator. T typr connection transformer can make three-phase voltages balance and suppress harmonics which is suitable to power supply system with unbalanced load.