The power quality problems like voltage fluctuation, voltage distortion, and harmonics at the L.T. line are generated by source and load, In this paper present review of Power quality problems and mitigation technique by using active filters. Firstly the design of a shunt Active Power Filter (SAPF) for grid-connected photovoltaic systems is presented. The main purpose of this paper to design high efficient PV integrated with grid. Efficiency of PV is improved by using MPPT technique. ANFIS based MPPT is the proposed method of this paper. The ANFIS based MPPT scheme works fast and gives improved results under change of solar irradiation. The simulation study is done using MATLAB/SIMULINK software. The proposed system injects PV power into the grid, by feeding the SAPF; to eliminate harmonics currents and compensate reactive power produced by nonlinear loads. To inject the photovoltaic power to the grid we use a boost converter controlled by a Fuzzy logic (FLC) algorithm for maximum power point tracking (MPPT). The overall system is designed and developed using MATLAB/Simulink software. Simulation results confirm the performance of the grid-connected photovoltaic system based on SAPF. For the MPPT controller, the results show that the proposed FLC algorithm is fast in finding the MPPT than conventional techniques used for MPPT like perturbed and observed. The simulated compensation system shows its effectiveness such as the sinusoidal form of the currents and the reactive power compensation. This technique is compared with the proposed ANFIS based MPPT scheme which is based on fast changing radiation. The ANFIS is trained to generate maximum power corresponding to the given solar irradiance level and temperature. The response of the ANFIS-based control system is highly precise and offers an extremely fast response. The main objective for a grid-connected Photovoltaic (PV) inverter is to feed the harvested energy from PV panels to the grid with high efficiency and power quality. The simulation results show that the proposed ANFIS MPPT controller is very efficient, very simple and low cost.
