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# 26 k. subramanian

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### 26 k. subramanian

1. 1. Implementation Of Vernier Mode Operation Using STATCOM For Terminal Voltage Regulation Of a 3-Ø Stand-Alone Self-excited Induction Generator by K. Subramanian, S. P. Sabberwal, M. Arunachalam and D. P. Kothari Over View: of the Presentation Abstract Key words 1. Introduction 2. System Configuration 3. Equivalent Circuit Analysis 4. Modeling of the Proposed System 5. Experimental Work 6. Results and Discussion 7. Conclusion References 12/10/2013 8:15 AM Power Electronics and Drives Division ,VIT University,Vellore,TamilNadu, India 632 014 1
2. 2. Abstract  This paper describes regulated voltage operation of a 3-Ø self-excited induction generator (SEIG) supplies power to an isolated power system comprises of R and R-L loads.  A wind turbine drives the rotor of SEIG generating voltage with variable magnitude and frequency. Therefore, the problem is to control both voltage and frequency.  For frequency control, an active power balancing technique is applied. A 3-Ø thyristor/triac switched reactor (TSR) with STATCOM is employed to regulate the terminal voltage of SEIG.  Instantaneous reactive power theory based control logic developed and implemented to control the power drawn by the additional load (dump load).   Mathematical model of the proposed system derived using steady state equivalent circuit followed by MATLAB/SIMULINK based simulation is executed. To validate the proposed system, a laboratory model of an isolated wind energy conversion scheme (WECS) is rigged up using conventional induction motor of 3Hp,3-Ø, 415V, 4.9A, and 1440 rpm coupled with a 220V, 20A separately excited d.c motor drive. A 3-Ø, 415 V capacitor bank of 100μF (in each phase) is connected across the stator terminals of the machine for its self-excitation. The results show a good agreement between the simulation and experiment. 12/10/2013 8:15 AM Power Electronics and Drives Division ,VIT University,Vellore,TamilNadu, India 632 014 2
3. 3. 1. Introduction The power generated mainly through the induction machines has a poor voltage regulation in particular isolated mode [5]-[6]. Different controller is used to control the voltage and frequency of SEIG is presented in detail [7]. Tarek Ahmed et al [8] present terminal voltage regulation of SEIG under different load conditions functioning in three distinct steps with static VAr compensator. However, there is a need for economic operation on a continuous basis. Bhim Singh et al [9] presented a stand-alone generating system using self-excited induction generators in the extraction of petroleum products; costly STATCOM is used for voltage regulation of the generator in full-scale range. The aim of this work is to implement a three-phase Voltage Source converter (VSC) based static reactive volt-ampere (VAr) compensator (STATCOM) employed to act as a Vernier between two steps is presented. Attempt is made to study the performance of SEIG for continuous load variation. The advantages of the proposed scheme are:  Rating and cost of STATCOM is low because it operates in Vernier control mode  If an active energy storage system like battery is connected on d.c side of STATCOM, it is called VSI-STATCOM; it aids to regulate the system voltage by supplying active power partially during low wind velocity. The VSC-STATCOM operating in Vernier mode such that it mitigates the excess VAr generated by the full load capacitance along with switched inductor. As soon as the load reactance varies, the generator operation shifts from resonant condition. In order to maintain resonance, the effective reactance of the load, magnetising reactance and switched reactance has to be altered. A simple control circuit is designed and implemented. 12/10/2013 8:15 AM Power Electronics and Drives Division ,VIT University,Vellore,TamilNadu, India 632 014 3