Series compensation to mitigate harmonics and voltage sags/swells in distributed generation based on symmetrical components estimation

Dynamic voltage restorer (DVR) is a custom power device used for voltage compensation of sensitive loads against voltage disturbances in power distribution lines. In order to ensure constant voltage without any harmonic distortions, the load voltage should follow a reference sinusoidal waveform of desired amplitude. One of the most common control algorithms that are used for the DVR is the symmetrical components method. A control strategy for the DVR based on the symmetrical components method has been proposed for the voltage and power flow control in the wind power supported distributed generation. The proposed method ensures the correction of the positive sequence amplitude during sag and swell, as well as eliminating harmonics distortion of the load voltage. In addition, it also controls the power exchange between the DVR and the distribution system by introducing a symmetrical phase shift into the extracted fundamental component of the load voltage. The results are verified using PSCAD/EMTDC simulation studies.

[1]  Frede Blaabjerg,et al.  Control and testing of a dynamic voltage restorer (DVR) at medium voltage level , 2004 .

[2]  Gyu-Ha Choe,et al.  A 3-phase series active power filter with compensate voltage drop and voltage unbalance , 2001, ISIE 2001. 2001 IEEE International Symposium on Industrial Electronics Proceedings (Cat. No.01TH8570).

[3]  J. S. Hsu.  Instantaneous phasor method for obtaining instantaneous balanced fundamental components for power quality control and continuous diagnostics , 1997 .

[4]  E.F. El-Saadany,et al.  A New Approach to Control DVR Based on Symmetrical Components Estimation , 2007, IEEE Transactions on Power Delivery.

[5]  San Shing Choi,et al.  Series compensation method to mitigate harmonics and voltage sags and swells , 2007 .

[6]  E.F. El-Saadany,et al.  An efficient control of the series compensator for sag mitigation and voltage regulation , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[7]  A. Ghosh,et al.  Control Strategies for Load Compensation Using Instantaneous Symmetrical Component Theory Under Different Supply Voltages , 2008, IEEE Transactions on Power Delivery.

[8]  U. Viscarret,et al.  Evaluation of different strategies for series voltage sag compensation , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[9]  Adly A. Girgis,et al.  Analysis of high-impedance fault generated signals using a Kalman filtering approach , 1990 .

[10]  G. C. Paap,et al.  Symmetrical components in the time domain and their application to power network calculations , 2000 .