Control Strategies for Load Compensation Using Instantaneous Symmetrical Component Theory Under Different Supply Voltages

In this paper, the theory of instantaneous symmetrical components is applied to explore various control strategies of load compensation, under different supply voltages. When the supply voltages are balanced and sinusoidal, all of these strategies converge to the same compensation characteristics. However, when the supply voltages are not balanced sinusoids, these control strategies result in different degrees of compensation in harmonics, power factor, neutral current, and compensator ratings. These control strategies are discussed in detail and a comparative study of their performance in terms of the rms value, total harmonic distortion, power factor of source currents, and compensator ratings is presented. Based on this study, it is possible to select the best strategy to meet the required load compensation characteristics for available supply voltages. A three-phase four-wire distribution system supplying an unbalanced and nonlinear load is considered for simulation study. The detailed simulation results using MATLAB are presented to support the proposed compensation strategies.

[1]  P. Postolache,et al.  Analysis of Three-Phase Systems With Neutral Under Distorted and Unbalanced Conditions in the Symmetrical Component-Based Framework , 2007, IEEE Transactions on Power Delivery.

[2]  Reza Ghazi,et al.  An optimal and flexible control strategy for active filtering and power factor correction under non-sinusoidal line voltages , 2001 .

[3]  Gian Carlo Montanari,et al.  Compensation strategies for shunt active-filter control , 1994 .

[4]  V. Agarwal,et al.  A novel, DSP based algorithm for optimizing the harmonics and reactive power under non-sinusoidal supply voltage conditions , 2005, IEEE Transactions on Power Delivery.

[5]  Arindam Ghosh,et al.  A new approach to load balancing and power factor correction in power distribution system , 2000 .

[6]  J.A. Pomilio,et al.  Shunt active power filter synthesizing resistive loads , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[7]  Mauricio Aredes,et al.  Three-phase four-wire shunt active filter control strategies , 1997 .

[8]  Yuan-Yih Hsu,et al.  A novel approach to the design of a shunt active filter for an unbalanced three-phase four-wire system under nonsinusoidal conditions , 2000 .

[9]  W. Mack Grady,et al.  IEEE Power Engineering Society , 2001 .

[10]  Surya Santoso,et al.  Understanding Power System Hannonics , 2001, IEEE Power Engineering Review.

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

[12]  L.S. Czarnecki,et al.  On some misinterpretations of the instantaneous reactive power p-q theory , 2004, IEEE Transactions on Power Electronics.

[13]  Shyh-Jier Huang,et al.  A control algorithm for three-phase three-wired active power filters under nonideal mains voltages , 1999 .

[14]  D. Gonzalez,et al.  Comparison between unity power factor and instantaneous power theory control strategies applied to a three phase active power filter , 1998, IECON '98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.98CH36200).

[15]  M.K. Mishra,et al.  A Novel Three-Phase Active Power Filter Control Algorithm with Unbalanced and Distorted Supply Voltages , 2005, TENCON 2005 - 2005 IEEE Region 10 Conference.