Author: K Rama Krishna, E Prasanna, M Ragini
Abstract: The Power Quality (PQ) in distribution system is affected by the pollution introduced by the customers. Voltage Sag is one of the Power Quality problem created by the nonlinear loads. When nonlinear load is connected to a source, there is a dip in the voltage which could be critical for the entire system. DSTATCOM (Distribution Static Compensator) which is connected in shunt at point of common coupling is one effective solution for system facing such problems. This work proposes a Cascaded H-bridge (CHB) Inverter based DSTATCOM to compensate voltage sag in power distribution network. CHB converters are being considered for the increasing number of applications due to their high power capability associated with low output harmonics and low commutation losses. The proposed design uses a standard three-leg inverter (one leg or each phase) and an H-bridge in series with each inverter leg which uses a capacitor as the dc power source. The performance of the proposed DSTATCOM is validated through simulation using MATLAB software with its Simulink and Power system block set tools and also the performance of the system without DSTATCOM and with DSTATCOM is evaluated
Keywords: DSTATCOM; Power Quality; Restructured Power Systems; Reactive Power Compensation.
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