提出了一种由并联变压器和电压源型逆变器组成的新型有源电力滤波器控制策略。具体方法：将变压器一次绕组与谐波源并联，检测变压器一次侧基波电压作为指令信号，控制电压源型逆变器的输出电压加在变压器的二次侧，当逆变器输出电压与变压器一次侧基波电压满足一定条件时，对基波分量而言，有源电力滤波器等效为一个可调电抗以补偿无功；对谐波分量而言，有源电力滤波器等效为变压器漏抗，从而疏导谐波流入变压器一次绕组。最后的仿真结果验证了该策略的可行性。%A kind of control strategy for new type active power filter composed of shunt transformer and voltage source in-verter was proposed which was to connect primary winding of the transformer with harmonic source in parallel,detect fun-damental voltage at the primary side of the transformer as command signal and control output voltage of the voltage source inverter at the secondary side of transformer. It was discovered that when output voltage of the inverter and fundamental voltage at the primary side of the transformer met a certain condition,the active power filter was equivalent to an adjustable reactance for compensating reactive power to fundamental component. While to harmonic component,the active power fil-ter was equivalent to transformer leakage reactance which might dredge harmonic to primary winding of the transformer. Final simulation results verified feasibility of this strategy.
展开▼
