An enhanced current control scheme for microgrids supporting inverters applications

Accelerated developments of renewable energy production technologies and their integration to existing AC microgrids have led to the emergence of several new inverters control schemes. The recently introduced proportional resonant (PR) controllers have the ability to precisely track AC quantities and are increasingly used in grid supporting inverters, especially for current control loops which are at the heart of power transfers. In this paper, the PR-controller action is analyzed and an enhancement is proposed. It is shown that the classical implementation is particularly sensitive to high frequency noises coming from measurements and relocating the proportional action (RPA) on the feedback path can overcome this issue. The proposed improvement was evaluated using bit-true simulations in the Matlab/Simulink
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environment. Obtained results show good noise and overshoot suppression using the proposed PR-controller with RPA.