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Power Management and Control of PMSG Based Hydro-PV-BES Using CSTOGI Control Algorithm for Autonomous Micro-Grid

Power management with voltage and frequency control of isolated micro-grid (MG) using permanent magnet synchronous generator (PMSG) based hydro –photovoltaic (PV) with a battery energy storage (BES), is dealt in this work. In this system, a bi-directional DC/DC converter (BDC) is used to connect the battery to DC-link of voltage source converter (VSC). The BDC controls the charging and discharging of the battery and provides the DC-link voltage control. The BDC enables to use a BES with reduced rating along with BES is able to manage power flow between hydro and PV array based energy sources. An active power balance is always maintained in the MG between the connected energy sources, thereby maintaining a constant frequency. The VSC along with voltage control also takes care of other power quality problems like reactive power requirement, harmonics and load unbalancing. A combined second and third order generalized integrator (CSTOGI) based control algorithm is proposed for VSC control. In this proposed algorithm, the outputs of third and second-order based generalized integrators (GIs) control structure, are reconstructed and combined together to obtain CSTOGI. It requires tuning of only one damping parameter, Ks. This control algorithm has a very simple structure, good dynamic response and good stability.