A three-phase four-wire power conditioner with load-dependent voltage regulation for energy saving

This paper presents a multi-functional three-phase four-wire power conditioner. It can compensate the reactive power, harmonic current, unbalanced power and zero-sequence current of the load with a capacity-limitation manner. It also can regulate multiple load voltages simultaneously based on the prescribed P-V characteristics of distinct loads for energy saving. Detailed design of the controllers providing these multiple functions is presented. A 6 kVA system with the inverter regulating two different load types simultaneously is implemented. The effectiveness of the proposed techniques is confirmed through some experimental results.