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A Control Strategy for a Distributed Power Generation Microgrid Application

Ashna Mohan, Dinto Mathew, Vidya M Nair

In this paper, a high performance inverter, including the functions of stand-alone and grid connected power supplies, is developed so that distributed generation units can operate individually or in a microgrid mode. Off-grid islanding describes the condition in which a microgrid or a portion of the power grid, which consists of a load and a distributed generation (DG) system, is isolated from the remainder of the utility system. In this situation, it is important for the microgrid to continue to provide adequate power to the load. Under normal operation, each DG inverter system in the microgrid usually works in constant current control mode in order to provide a preset power to the main grid. When the microgrid is cut off from the main grid, each DG inverter system must detect this islanding situation and must switch to a voltage control mode. In this mode, the microgrid will provide a constant voltage to the local load. This paper describes an Adaptive Total Sliding Mode Control (ATSMC) scheme for the DG inverter with full bridge framework. Hence the proposed inverter with the ATSMC scheme has low Total Harmonic Distortion and high power factor to provide an ac output with high power quality. The effectiveness of the proposed high performance inverter with the ATSMC is verified using MATLAB / Simulink software environment.