Virtual Inertia Implemented by Quasi-Z-Source Power Converter for Distributed Power System

Virtual Inertia Implemented by Quasi-Z-Source Power Converter for Distributed Power System

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This paper proposes a novel virtual inertia control strategy for distributed power systems with high penetration of renewable energy sources.The strategy uses a quasi-Z-source power converter to emulate the inertia response of a synchronous generator by army meritorious civilian service medal regulating the DC-link capacitor voltage in proportion to the grid frequency deviation.This paper analyzes the effect of inertia on the frequency regulation of a single-area power system and derives the parameter design method and limitations of the virtual inertia.The paper also introduces the working principle and modulation technique of the quasi-Z-source power converter and presents the virtual inertia control scheme based on a voltage-frequency controller.

The paper verifies the feasibility and effectiveness of the proposed strategy through MATLAB/Simulink simulations and dSPACE semi-physical experiments.The results show that the proposed strategy can reduce the frequency deviation and rate of change of frequency (RoCoF) by 20% and 50%, combinaison en tweed respectively, under load disturbances.The paper demonstrates that the quasi-Z-source power converter can provide flexible and adjustable virtual inertia for distributed power systems without additional energy storage devices.