A new flexible distributed generation unit for active power generation and harmonic compensation under non-ideal source voltages condition

In this paper a flexible distributed generation (FDG) with a new control scheme is proposed for the purpose of contributing to power generation and harmonic compensation under non-ideal source voltages. The proposed FDG consists of a Solid Oxide Fuel Cell unit (SOFC) as power source and a three-arm full bridge DC-AC PWM inverter as utility interface. The new control scheme enables the FDG to deliver sinusoidal active currents in-phase with positive sequence of source fundamental voltages and also to compensate harmonic currents which are drawn by non-linear load under non-ideal source voltage. The proportional resonant (PR) controllers are used for reference signal tracking. In order to investigate the proposed FDG, simulations will be conducted using PSB of Matlab Simulink software. The results show the validity of the proposed FDG.