Minimisation of VA loading of UPQC in three-phase four-wire distribution system

Unified power quality conditioner (UPQC) is a combination of series and shunt active power filters with a common DC link. This device is used to enhance power quality by injecting required amount of Volt-Ampere (VA) into the system. In view of the cost effectiveness, it is desirable to have VA loading of UPQC without compromising the compensation capability. This paper presents a methodology to minimise VA loading of UPQC, considering the effects of unbalance in load and distortions in both load current and source voltage during the compensation of voltage sag with phase jumps in a distribution system. The minimum VA loading of the UPQC is achieved by injecting a series voltage at an optimum angle using series active power filter with respect to the voltage sag. In this paper, a particle swarm optimisation (PSO)-based technique is used to minimise the VA loading of UPQC. The proposed method has been validated through detailed simulation studies and the results are presented.

[1]  John Godsk Nielsen,et al.  Control strategies for dynamic voltage restorer compensating voltage sags with phase jump , 2001, APEC 2001. Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.01CH37181).

[2]  Malabika Basu,et al.  Comparative evaluation of two models of UPQC for suitable interface to enhance power quality , 2007 .

[3]  Mahesh K. Mishra,et al.  PSO-based feedback controller design of DSTATCOM for load compensation with non-stiff sources , 2008 .

[4]  Hari Om Gupta,et al.  Performance evaluation of CSI-based unified power quality conditioner using artificial neural network , 2008 .

[5]  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,.

[6]  H. Happ.  Power system control and stability , 1979, Proceedings of the IEEE.

[7]  B. Anderson,et al.  Linear Optimal Control , 1971 .

[8]  Mahesh K. Mishra,et al.  Ramp based constant frequency current control for DSTATCOM , 2009 .

[9]  Hirofumi Akagi,et al.  The unified power quality conditioner: the integration of series- and shunt-active filters , 1998 .

[10]  V. Jayashankar,et al.  Rating and design issues of DVR injection transformer , 2010 .

[11]  Arindam Ghosh,et al.  Power Quality Enhancement Using Custom Power Devices , 2002 .

[12]  M.K. Mishra,et al.  A Minimally Switched Control Algorithm forThree-Phase Four-Leg VSI Topology toCompensate Unbalanced and Nonlinear Load , 2008, IEEE Transactions on Power Electronics.

[13]  F.A.L. Jowder,et al.  Design and analysis of dynamic voltage restorer for deep voltage sag and harmonic compensation , 2009 .

[14]  Arindam Ghosh,et al.  A unified power quality conditioner (UPQC) for simultaneous voltage and current compensation , 2001 .

[15]  Mahesh K. Mishra,et al.  DSTATCOM topologies for three-phase high power applications , 2010 .

[16]  Malabika Basu,et al.  Investigation on the performance of UPQC-Q for voltage sag mitigation and power quality improvement at a critical load point , 2008 .

[17]  Y.Y. Kolhatkar,et al.  Experimental Investigation of a Single-Phase UPQC With Minimum VA Loading , 2007, IEEE Transactions on Power Delivery.

[18]  Riccardo Poli,et al.  Particle swarm optimization , 1995, Swarm Intelligence.