Power quality improvement in grid connected renewable energy sources at distribution level

Today, Increase the demand of Renewable energy resources (RES) in distribution systems because total energy demand is supplied by the burning of fossil fuels and it is limited. In this paper presents a control strategy of three phase four wire grid interfacing inverter to effectively utilize the renewable energy Source with grid. Controlling of inverter in such a way that to utilize the following function 1) compensate load current (i.e. reduce harmonics), 2) compensate load voltage (i.e. reduce harmonics), 3) compensate load reactive power and load neutral Current. The Renewable Energy Source may be Solar or Wind depends on distribution system voltage level. All these works of the inverter is done either individually or combined to overcome the unbalanced effects of all types of linear, non-linear, balance or unbalance loads at distribution level. This new control concept is demonstrated with extensive MATLAB/Simulink simulation to validated result.