The unified power quality conditioner: the integration of series- and shunt-active filters

This paper deals with unified power quality conditioners (UPQCs), which aim at the integration of series-active and shunt-active power filters. The main purpose of a UPQC is to compensate for voltage flicker/imbalance, reactive power, negative-sequence current and harmonics. In other words, the UPQC has the capability of improving power quality at the point of installation on power distribution systems or industrial power systems. This paper discusses the control strategy of the UPQC, with a focus on the how of instantaneous active and reactive powers inside the UPQC. Experimental results obtained from a laboratory model of 20 kVA, along with a theoretical analysis, are shown to verify the viability and effectiveness of the UPQC.

[1]  Subhashish Bhattacharya,et al.  Synchronous frame based controller implementation for a hybrid series active filter system , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[2]  H. Akagi,et al.  A practical approach to harmonic compensation in power systems-series connection of passive and active filters , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[3]  Laszlo Gyugyi,et al.  Unified power-flow control concept for flexible AC transmission systems , 1992 .

[4]  H. Akagi,et al.  A new approach to harmonic compensation in power systems , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[5]  T. G. Habetler,et al.  Combined deadbeat control of a series-parallel converter combination used as a universal power filter , 1995 .

[6]  S. Moran,et al.  A line voltage regulator/conditioner for harmonic-sensitive load isolation , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[7]  Hirofumi Akagi,et al.  New trends in active filters for power conditioning , 1996 .

[8]  Hirofumi Akagi,et al.  Instantaneous Reactive Power Compensators Comprising Switching Devices without Energy Storage Components , 1984, IEEE Transactions on Industry Applications.

[9]  L. Gyugyi,et al.  A unified flow control concept for flexible AC transmission systems , 1991 .

[10]  Fang Zheng Peng,et al.  A Combined System of Shunt Passive and Series Active Filters , 1990 .