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Investigations on Power Quality Issues in a Renewable Hybrid Power System

Deepthi D, Dhanalakshmi R

This paper describes the modeling and simulation of renewable energy sources based hybrid power system. To meet the load demands different renewable energy sources with local converters are considered to boost up as well as to maintain the output voltage constant. The proposed paper focuses on the combination of photo voltaic (PV), wind turbine system, fuel cell and battery for the power generation. To improve power quality, a DC motor- Synchronous generator set is proposed instead of using the conventional inverter. In order to maintain the power quality as high as possible it is required to have constant system frequency and voltage. This can be achieved by controlling the speed of dc motor-generator set by using the PID controller. Power quality issues are investigated by simulating the hybrid power system with motor-generator set and the results are compared with the existing inverter model to prove the effectiveness of the proposed one .An energy management and control unit(EMCU) is also proposed in our present work. This unit is built on an algorithm which enables the effective utilization of the power from the renewable energy sources and reduces the consumption of electricity from the commercial sources. Modeling and simulation is done using the MATLAB/Simulink.