Parallel operation of three-phase four-wire active power filters without control interconnection

This paper presents the parallel operation of the three-phase four-wire active power filters (APFs). Functions of the proposed APF include compensation of reactive power, harmonic current, unbalanced power and zero-sequence current of the load. The objective is to achieve unity power factor, balanced line current and zero neutral-line current. Compensation of all components is capacity-limited, cooperating with the cascaded load current sensing scheme, multiple APFs can be paralleled to share the load power without requiring any control interconnection. Besides providing the theoretic bases and detailed design of the APFs, two 6 kVA APFs are implemented. The effectiveness of the proposed methods is validated with some experimental results.

[1]  A. Dastfan,et al.  Control of a new active power filter using 3-D vector control , 2000 .

[2]  Juan W. Dixon,et al.  A simple and low-cost control strategy for active power filters connected in cascade , 1997, IEEE Trans. Ind. Electron..

[3]  S. J. Chiang,et al.  Design and implementation of the parallelable active power filter , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[4]  J. Dixon,et al.  A new current control strategy for active power filters using three PWM voltage source inverters , 1993, Proceedings of IEEE Power Electronics Specialist Conference - PESC '93.

[5]  Subhashish Bhattacharya,et al.  Active filter solutions for utility interface of industrial loads , 1996, Proceedings of International Conference on Power Electronics, Drives and Energy Systems for Industrial Growth.