Compensators are devices which diminish the current harmonics of the lower order which are injected to the electric grid to meet the international standards. Resonant compensators are used to reduce the particular harmonics in grid-connected photovoltaic inverters. This paper presents how the harmonics are mitigated within the standards by using lead, lag, lead-lag compensators. The frequency deviation and transient response are considered the important factors during the design of the compensators. MATLAB design of grid connected photovoltaic inverter is presented with simulation result. A hardware of three phase photovoltaic load connected inverter with LCL filter was implemented. The simulation and experimental results of Grid connected Photovoltaic inverter with and without compensation are discussed. The harmonic profiles of these compensators are also presented.
Voltage disturbance observer for dual three-phase PMSM system
