Fuzzy Logic Shunt Active Power Filter for Grid Connected Solar Photovoltaic System

The requirement of renewable energy has become a critical topic in modern days, due to increasing problem like global warming & other environmental issues. Any solar cell will supply maximum power at maximum power point. Moreover, the locus of MPP changes over a various range that depends on the PV array temperature & insolation intensity. Aging of PV cells also affect the MPP locus. Thus PV module has the ability to find highest power point MPP of the PV array and maximum value at which power can be tracked is maintained constant by using P &O method. This DC output power is inverted through power electronic converter into 3-phase AC and coupled with AC utility grid. However these high frequency switching converters will inject additional harmonics in the system, which are increasing with variable insolation. Moreover, presence of non linear load in system will further inject harmonic current and as a consequence, there is a violation of IEEE-519 power quality standard (limits), and chances of damage or breakdown of power system equipment may increase. Shunt active power filter is the prominent solution against nonlinear loads, current harmonics and power quality problems. As a solution, fuzzy logic based Shunt Active Power Filter (FLC-SAPF) is proposed. Indirect current control scheme based on hysteresis controller has been used for controlling of active filter. The FLC-SAPF will eliminates harmonics thus it can lowers THD below 5%. The effect of sudden change in non linear load and variation in solar insolation should also taken into consideration. The whole system is modelled and simulated using MATLAB/SIMULINK environment.