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Abstract
A micro grid is an individual power generation unit, which contains DistributedGeneration System to supply power for local loads. In other words, Microgrid is a unit ofintegration of the Distributed generators and loads which can operate either connectedto or isolated from the main grid. In this paper voltage and frequency, V-f or Q-f method is being used to share the power of parallel connected Voltage source invertersin isolated micro grid by droop control method. In another mode which is grid connected, in this mode available power is being feed into the grid. Micro grid operation is influenced by the control strategy.So, in this study, two typical control schemes active and reactive power feed into grid inconnected mode and voltage-frequency in isolated mode are discussed. In connected modeof operation, micro grid voltage and frequency is decided by grid. In the Voltage-frequency modedistributed generators units share the remained power according to the droop controlstrategy. In solar power plants which are grid connected, in this case poweris being feed by PQ mode of inverter. In this mode inverter works in constantcurrent mode and inverter voltage and frequency is decided by the grid. In islandingmode of operation power sharing of two parallel connected inverters is being done by local measurement. Simulation is being done in Matlab/Simulink software.