Distribution Static Compensator using DC Link VSI for Power Quality Improvement
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Date
2015-12-23T08:42:28Z
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Power quality issue is one the main problem faced in today end user equipments. Here the source harmonics present in current due to unbalanced and Non-Linear loads. The Total Harmonics Distortion (THD) is analyzed for source current. THD before compensation and after compensation for unbalanced and Non-Linear load; during analyzing THD, phase A of unbalanced load is removed for simulation time period. Thus applying two phase load and simulating the matlab model to find the THD for all three phases. Also, THD is tabulated for both at unbalanced conditions. With help of three phase circuit breaker, Shunt Active Filters (SAF) is connected at Point Of Common Contact (PCC). Circuit breaker is designed such that the initially SAF is not connected to PCC. After 0.04 seconds, circuit breaker from its initial open status is closed after 0.04 seconds and remains connected till the end of simulation time. Control algorithm to generate gate pulses to trigger Integrated Gate bipolar Transistor (IGBT). The compensated source current is generated with the help of IGBT through RL filter circuit.The reference current methodology applied here is Instantaneous Symmetrical Component Theory. ISRF is proposed for three-phase four-wire DSTATCOM (Distribution Static Compensator) which includes voltage source converter and a dc link capacitor. The Source power to Voltage Source Inverter (VSI) is performed with constant DC source. The THD is observed in source current. Thus Results are compared for unbalanced and non-linear load. Critical analysis is performed for THD in source current for unbalanced and non-linear load when source for VSI is constant DC supply. It has been observed that the THD is reduced after injecting compensation after 0.04 seconds till simulation time. The THD for two phase load is greater than three phase load.
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Distribution Static Compensator using DC Link VSI for Power Quality Improvement, Sreerag S, Pacha Ashok Kumar, Veeresh Kumara, Vijay Kumar