International Journal of Electrical and Electronics Research ISSN 2348-6988 (online) Vol. 10, Issue 2, pp: (27-34), Month: April - June 2022, Available at: www.researchpublish.com
MODELLING AND SIMULATION OF SHUNT CAPACITOR EXCITED RELUCTANCE GENERATOR AS A STANDALONE GENERATOR Amu Victor Ndubuisi1, M.O Alor 2 1, 2
Department of Electrical and Electronic Engineering Faculty of Engineering,
Enugu State University of Science and Technology Enugu State, Nigeria DOI: https://doi.org/10.5281/zenodo.6602524
Published Date: 01-June-2022
Abstract: This paper presents a methodology for accurately predicting the minimum value of capacitance necessary to initiate excitation in a standalone self-excited reluctance generator (SERG). The methodology is based on modeling, analysis and simulation of various capacitances to determine the range of capacitance needed for excitation. The dynamic and steady-state performances of the self-excited reluctance generator were analyzed under different operating conditions. This analysis was done by developing a complete dynamic model of SERG including the excitation capacitors and load. The performances of the machine under conditions of constant load, and varying loads were analyzed and presented. The modeling and simulation have been carried out using MATLAB‐Simulink platform. The results obtained shows that for excitation to take place, the minimum value of capacitor needed is 61µf, below which the generator will not excite. The machine could excite and attained its rated voltage between 61µf to 110µf, above which the generator begins to generate over voltage. For the dynamic performance analysis, the results shows that with the variations in the connected loads, the output frequency of SERG remains constant, which makes it a good alternative for remote area applications. Keywords: Reluctance generator, Modelling, Excitation Capacitance, Computer, Matlab Simulink.
I. INTRODUCTION Self-excited generators have been identified as better alternatives to Permanent Magnet Synchronous Generators (PMSG) and Doubly-Fed Induction Generators (DFIG) in the area of application such as stand alone, off-grid, Wind Energy Conversion Systems (WECS). Low cost of production and operation as well as simplicity offered SEG the needed advantage against PMSG and DFIG. The most commonly investigated self-excited generator is the Self-Excited Induction Generator (SEIG) with squirrel cage rotor. SEIG has found its application in isolated wind turbine energy conversion and has gained prominence in recent years. This is due to its innumerable advantages over the conventional synchronous generator which includes simplicity, brushless, rigidity, and robustness in construction, relative low initial and maintenance cost, self production against excessive overload and short circuit contingencies. In addition, SEIG requires no extra DC supply for excitation and voltage regulation, and they have better transient performances. However, it suffers from poor voltage and frequency regulation with changes in load and prime-mover speed, with an attendant need for voltage and frequency stability circuit. In order to overcome the above shortfalls of SEIG, Self Excited Reluctance Generator (SERG) has been explored as an alternatives choice for use in stand-alone systems such as wind energy conversion system. Consequently, investigation has now shifted to SERG.
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