Electronic Load Controller for a Parallel Operated Isolated Asynchronous Generator Feeding Various Loads
- 1
- 2
- 3
- 4
Abstract
This paper presents an investigation on a voltage and frequency controller (VFC), which functions as an improved elec-tronic load controller (IELC) for parallel operated isolated asynchronous generators (IAGs) in an autonomous hydro power generation system. In such type of hydro scheme whole generating system is isolated from the grid and supply electricity to the remote communities. The single point operation of these generators is realized, in such a manner that excitation capacitors, speeds, load, voltage, currents of generators remain constant under various operating conditions. The proposed controller consists of a 3-leg IGBT (Insulated Gate Bipolar Transistor) based voltage source converter (VSC) and a DC chopper with an auxiliary load at the DC bus of the VSC. The IELC controls the reactive and active powers simultaneously for controlling the voltage and frequency under varying consumer loads. Along with voltage and frequency control through single point operation of IAGs driven by uncontrolled pico hydro turbines, the IELC meets the power quality standard an IEEE-519 and it keeps the total harmonic distortion (THD) of the terminal voltage and currents within the limit of 5%. Here the proposed electrical system along with its controller is modeled in MATLAB along with Simulink and PSB (Power System Block-set) toolboxes. Simulation results are presented to demonstrate the capability of proposed controller for an isolated generating system.
- H. M. B. Metwally, “New Self-Excited Variable Speed Constant Frequency Generator for Wind Power Systems,” Energy Conversion and Management, Vol. 41, No.13, September 2000, pp 1405-1417. doi:10.1016/S0196-8904(99)00170-3
- J. M. Chapallaz, D. G. P. Eichenberger and G. Fischer, “Manual on Induction Mo-tors Used as Generators,” Vieweg (Braunschweig), 1992.
- B. Singh, “Induction Generator—A Prospective,” Electric Machines and Power Systems, Vol. 23, No. 2, 1995, pp. 163-177. doi:10.1080/07313569508955615
- E. Suarez and G. Bortolotto, “Voltage—Frequency Control of a Self Excited Induction Generator,” IEEE Transactions on Energy Conversion, Vol. 14, No. 3, September 1999, pp. 394-401. doi:10.1109/60.790888
- B. Singh, S. S. Murthy and S. Gupta, “Transient Analysis of Self Excited Induction Generator with Electronic Load Controller Supplying Static and Dynamic Loads,” IEEE Transactions on Industry Applications, Vol. 41, No. 5, September 2005, pp. 1194-1204. doi:10.1109/TIA.2005.855047
- B. Singh, S. S. Murthy and S. Gupta, “Analysis and Implementation of an Electronic Load Controller for a Self- Excited Induction Generator,” IEE Pro-ceedings—Ge- neration Transmission and Distribution, Vol. 151, No.1, January 2004, pp. 51-60. doi:10.1049/ip-gtd:20040056
- R. Bonert and S. Rajakaruna, “Self-Excited Induction Generator with Excellent Voltage and Frequency Control,” IEE Proceedings—Generation, Transmission and Distribution, Vol. 145, No. 1, January 1998, pp. 33-39. doi:10.1049/ip-gtd:19981680
- B. Singh, S. S. Murthy and S. Gupta, “Analysis and Design of Electronic Load Controller for Self-Excited Induction Generators,” IEEE Transactions on Energy Conversion, Vol. 21, No. 1, March 2006, pp. 285-93. doi:10.1109/TEC.2005.847950
- B. Singh, S. S. Murthy and S. Gupta “A Voltage and Frequency Controller for Self-Excited Induction Generators,” Electric Power Components and Systems, Vol. 34, No. 2, February 2006, pp 141-157.
- B. Singh, S. S. Murthy and S. Gupta, “An Improved Electronic Load Controller for Self-Excited Induction Generator in Micro-Hydel Applications,” Proceedings of IEEE Industrial Electronics Conference (IECON), Vol. 3, 2-6 November 2003, pp 2741-2746.
- H. S. Timorabadi, “Voltage Source Inverter for Voltage and Frequency Control of a Stand-Alone Self-Excited Induction Generator,” Canadian Conference on Electrical and Computer Engineering, Ottawa, 2007, pp. 2241- 2244.