Control of voltage & frequency of a hybrid microgrid using a FLC based bidirectional converter equipped with BESS

In this paper a hybrid Microgrid system has been taken into consideration. A 22KW SEIG based micro-hydro system, an 18KW PV Array and a 7.5 KW DFIG based wind system are supplying power to a time varying load. The micro-hydro system is fed from a constant power source. The PV array with a boost converter supplies active power through the Grid Side Converter-I which controls the PV power fed to the system. The stator side of the DFIG supplies power to the system at unity power factor where Rotor side converter controls stator side power flow. A Battery Energy Storage System (BESS) is connected at the DC side of the Fuzzy based GSC-II, hence GSC-II controls and compensates both the active and reactive power according to the load demand. This paper doesn't present the MPPT of PV array and Wind energy system but concentrates on the control of the Fuzzy based RSC, GSC-I & GSC-II so as to maintain the voltage and frequency of the system. Complete performance of the isolated Microgrid system has been presented taking several load i.e. linear, non-linear and dynamic loads into account. All the cases have been simulated using MATLAB/Simulink platform.