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Optimized PID controller based voltage oriented control of the 7-level diode clamped inverter for distributed generation system

This paper presents an improved Voltage Oriented Control (VOC) scheme to control a three-phase grid-connected 7-level diode clamped inverter, where this inverter is the Distributed Generation (DG) unit that is the core of the Distributed Generation System (DGS). An optimization method is used to recursively tune the parameters of the PID controller in the presented control scheme so as to achieve the optimal performance for the DG unit in a grid-connected mode. Simulation results are carried out to show the meritorious performance of the proposed control scheme while tracking the power references, which represent the required power to be injected by the DG unit to the distribution system.