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Control of Grid Connected Hybrid Energy Systemusing Synchronous Reference Frame Technique

V.Jagadeesh Babu, J.Arun Venkatesh

This paper presents the control of three phase grid connected inverter for small size renewable hybrid energy system comprising of PV array, Fuel-Cell and Battery has sources. The inverter, based on a voltage source inverter configuration, supply powerto the l o a d , at the same time satisfying the grid interconnection standards. The control structure uses the Direct-Quadrature (DQ) synchronous reference frame transformation. This method transforms an orthogonal pair consisting of the inverter output current and a time shifted version of this current from a stationary frame to a rotating frame synchronous to the fundamental output frequency. The steady state current components in this rotating DQ frame are DC values and thus PI control methods can be used with zero error. Phase Locked Loops is used to detect the phase angle of the grid voltage. A Simulink simulation model and results where the inverter output is controlled to match a local load's active and reactive power demand is presented.