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ANALYSIS AND CONTROL OF CAPACITOREXCITED INDUCTION GENERATORS CONNECTED TO A MICRO-GRID THROUGH POWER ELECTRONIC CONVERTERS ABSTRACT A system consisting of a capacitor-excited induction generator (CEIG) with associated power electronic converters has been developed for supplying power to a micro-grid. The power fed to the grid from the CEIG is controlled using a diode bridge rectifier (DBR) and a pulse width modulated (PWM) inverter, connected between the generator terminals and the grid. A simple analog based hysteresis current control (HCC) technique has been employed in which the current control of the PWM inverter alone needs to be carried out by sensing the current and voltage at the grid terminals. CIRCUIT DIAGRAM Existing System The design and development of renewable energy sources are very much emphasised now-a-days because of the fast depletion of conventional energy sources and the environmental pollution caused by them. Even though, for such renewable energy systems, doubly fed induction generators (IG) are being developed, squirrel cage IGs are continued to be used because of their low cost, simple and robust construction and almost nil maintenance requirements. These generators are operated either for feeding power directly to the grid or for supplying power to isolated loads with capacitor excitation. In the case of wind driven systems, the direct grid-connected induction generators (GCIGs) operate with a small variation in rotor speed from no load to full load, whereas in the case of standalone generators, the rotor speed varies along with the variation in prime mover speed. However, in the case of such GCIGs also, if the rotor speed is allowed to vary, the machine can be operated with optimum power coefficient and maximum power (MP) can be extracted and delivered to the grid. Proposed System It is shown that the grid power can be represented in the equivalent circuit of CEIG as an equivalent resistance (Re) only and expression for Re is given in terms of generator phase voltage and the power supplied to the grid. The sequence of the steps involved in the calculation of the generator parameters for a given power fed to the micro grid and further predetermination of performance of the entire proposed system has been illustrated in the form of a flowchart. CEIG are presented for three different patterns of loading, including cube law power extraction for variable speed wind driven applications. The closeness between the experimental and predicted results validates the proposed method of analysis and also the successful working of the simple analog hysteresis control technique, for different renewable energy applications. TOOLS AND SOFTWARE USED: MP LAB ORCAD/PSPICE MATLAB/SIMULINK OUTPUT: HARDWARE SIMULATION