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20211
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Subject: Electrical Engineering × Author: Ahmad, Tanveer × End date: 2022 × Type: Thesis ×
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    ThesisItemOpen Access
    STATCOM based voltage and frequency regulator for self-excited induction generator
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-02) Ahmad, Tanveer; Srivastava, Ajay
    Self-excited induction generator (SEIG) belongs to the class of asynchronous electrical machines. SEIG offers many attractive features like low maintenance, absence of a separate dc excitation system, good transient performance, ruggedness of its cage rotor construction, reduced cost, brushless rotor, self-protection against short circuits etc. As a result, the self-excited induction generators are increasingly being used in grid-isolated areas, stand-alone wind power applications. Its market is rapidly expanding. Since the development of induction generators, problems were encountered for poor voltage and frequency regulations but in last decade, the continuing technological development in power electronics, microprocessors, semiconductor chips, have combined to provide reliable and efficient regulation at varying loads and varying speeds. In SEIG, the terminal voltage drops with load variation so the prime objective of closed loop control is to maintain the reactive power level almost constant irrespective of load changes. So closed loop is necessary in applications that demands better control and constant terminal voltage. The terminal voltage of the generator is compared with the reference voltage continuously. The voltage and frequency regulation of SEIG depends upon two factors. One is the excitation system and second is the control strategies. If excitation fails, control strategy is required to bring back the stable operation. Various types of control strategies have been proposed in the past for studying the behaviour of SEIG during dynamic & transient periods. This thesis comprises of simulation and STATCOM based control strategy with reference to voltage, frequency and current response under variable loading conditions at constant rotor speed. Simulations were performed in MATLAB/Simulink software. Simulation results concluded that at rated voltage of 480 V and speed 1800 RPM for selfexcited induction generator and at different loadings of 50 kW and 30 kW, an excellent voltage and frequency regulation was achieved through proper tuning and suitable gains of regulators of a 100 kVA, 480V STATCOM based controller. The stable operation of system was disturbed with load variation and it is successfully regained with the help of STATCOM controller.