Modified Single Phase SRF d-q Theory Based Controller for DVR Mitigating Voltage Sag in Case of Nonlinear Load
- 1 Department of Electrical Engineering, G.H. Raisoni College of Engineering, Nagpur, India
- 2 G.H. Raisoni Institute of Engineering and Technology, Nagpur, India
- 3 Y.C. College of Engineering, Nagpur, India
- 4 G.H. Raisoni College of Engineering, Nagpur, India
Abstract
This paper mainly concentrates on design of improved controller and its implementation based on single phase synchronous reference frame theory (SRFT) for Dynamic Voltage Restorer (DVR) compensating voltage sag particularly for nonlinear load. In case of single phase distribution line with nonlinear load, the complexity of controller’s design becomes more serious issue. The present single phase and/or three phase theories applicable to DVR shows poor response to restore voltage sag in case of nonlinear load due to presence of harmonics. Hence restoration of voltage sag in single phase nonlinear load connected system has been a serious concern. Therefore, new controller for DVR has been proposed incorporating effective design concept for fundamental component extraction in case of nonlinear load. The single phase SRFT based main controller for DVR works on two separate closed path viz. feed forward path for quick transient response and feedback path for reducing the steady state error. Moreover, pre-sag mitigation strategy of DVR has been adapted through these two aforementioned paths. Complete design of proposed controller is based on phasor analysis. It also consist of proportional integral (PI) controller to reduce the error in the DC-link voltage during compensation time. The controller performance has been verified in MATLAB Simulink for both types (linear and nonlinear) of load. The results obtained indicates that the proposed controller is effective in its performance.
- Bollen, M.H.J. (2000) Understanding Power Quality Problems—Voltage Sags and Interruptions. IEEE Press, Piscataway, New York.
- Bollen, M. (1995) The Influence of Motor Reacceleration on Voltage Sags. IEEE Transactions on Industry Applications, 31, 667-674. https://doi.org/10.1109/28.395271
- Hingorani, H. (1995) Introducing Custom Power. IEEE Spectrum, 32, 41-48. https://doi.org/10.1109/6.387140
- Hingorani, N.G. and Gyugyi, L. (2000) Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems. 1st Edition, The Institute of Electrical and Electronics Engineer.
- Jurado, F. (2004) Neural Network Control for Dynamic Voltage Restorer. IEEE Transaction Industrial Electronics, 51, 727-729.
- Haque, M.H. (2001) Compensation of Distribution System Voltage Sag by DVR and DSTATCOM. Power Tech Proceedings, 2001 IEEE Porto, Vol. 1, 10-13 September 2001, 5 p.
- Samineni, S. and Johnson, B.K. (2006) Modeling and Analysis of a Flywheel Energy Storage System for Voltage Sag Correction. IEEE Transactions on Industry Applications, 42, 42-52.
- Singh, B., Jayaprakash, P., Kothari, D.P., Chandra, A. and Kamal-Al-Haddad (2011) New Control Algorithm for Capacitor Supported Dynamic Voltage Restorer. Journal of Electromagnetic Analysis and Applications, 3, 277-286.
- Zhan, C. and Ramachandaramurthy, V.K. (2001) Dynamic Voltage Restorer Based on Voltage-Space-Vector PWM Control. I IEEE Transactions on Industry Applications, 37, 1855-1863.
- Haque, M.H. (2001) Voltage Sag Correction by Dynamic Voltage Restorer with Minimum Power Injection. IEEE Power Engineering Review, May 2001, 56-58.
- Meyer, C., De Doncker, R.W., Li, Y.W. and Blaabjerg, F. (2008) Optimized Control Strategy for a Medium-Voltage DVR—Theoretical Investigations and Experimental Results. IEEE Transactions on Power Electronics, 23, 2746-2754. https://doi.org/10.1109/TPEL.2008.2002299
- Khadkikar, V., Chandra, A. and Singh, B.N. (2009) Generalised Single-Phase p-q Theory for Active Power Filtering: Simulation and DSP-Based Experimental Investigation. IET Power Electronics, 2, 67-78. https://doi.org/10.1049/iet-pel:20070375
- Kanjiya, P., Singh, B., Chandra, A. and Al-Haddad, K. (2013) “SRF Theory Revisited” to Control Self-Supported Dynamic Voltage Restorer (DVR) for Unbalanced and Nonlinear Loads. IEEE Transactions on Industry Applications, 49, 2330-2340.