Modelling and simulation of grid power management with modified fuzzy logic based MPPT tracking with hybrid power energy system

摘要

The rapid use of distributed energy resources has increased as a supplement and also an alternative to large conventional grid power stations. However, the presence of non-linear loads in the utility grid will ultimately result to generation of the current and voltage harmonics and this in turn will hamper the power quality of the whole power system. Recently, the utility grids are accommodated with mixed energies which results in increase of complexities and various instabilities. The present paper is based on the improvement of power quality with hybrid power generating system comprising of both Wind and PV system. An improved fuzzy logic based MPPT is implemented for the hybrid system which provides maximum power and helps to attain a stable and reliable power from the generation system both for the loads and the utility grid, thus improving both the steady and dynamic behaviors of the whole generation system. A grid-connected control strategy is proposed keeping in view of the problems, which is based on the model of a hybrid system with load parallel in large system. The control strategy can not only make the full use of photovoltaic (PV) power, but can also maintain a synchronous voltage with a fluctuant reactive load. Two different P and Q based inverter control topologies are designed to provide a closed loop for both active and reactive power control for the hybrid system and maintaining an accurate synchronization of power quality of the utility grid. Thus, the inverter can be utilized as power converter which will inject the power generated from the renewable energy source to the grid and can also compensate the power quality disturbances and the load reactive power demand.