基于瞬时无功理论的并联型有源滤波器恒功率控制

Constant power control for shunt active filter based on instantaneous power theory

根据瞬时功率理论，研究了并联型有源滤波器的工作机制，通过实现逆变器有功功率和无功功率的解耦，提出了并联型有源滤波器恒功率控制策略。该控制策略通过分离出待补偿的功率分量，然后计算出其与逆变器实际功率的误差，根据误差生成逆变器参考电压，采用空间矢量调制算法对功率进出补偿，实现系统的恒功率控制。该策略可以有效抑制系统交流侧谐波电流，补偿无功功率，稳定输出的有功功率，改善系统稳态性能。最后，通过Maflab/Simulink对该控制策略进行仿真验证，结果证明了该策略的正确性和有效性。

According to the instantaneous power theory, the operation mechanism of the shunt active filter is in- troduced. Through the inverter active power and reactive power decoupling, the constant power control strategy of shunt active filter is proposed. The error between compensated power component which is isolated and actual pow- er of the inverter is calculated to build the inverter voltage space vector. The space vector modulation is used to compensate the power and realize constant power operation of the system. The strategy can effectively inhibit AC harmonic current, compensate reactive power, stabilize the active power output and improve the system steady- state performance. The simulation is verified to the control strategy by Matlab/Simulink. The results show the cor- rectness and effectiveness.