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

Yitao Liu (), Hongle Chen and Runqiu Fang
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Yitao Liu: College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
Hongle Chen: College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
Runqiu Fang: College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China

Energies, 2023, vol. 16, issue 18, 1-18

Abstract: 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 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%, 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.

Keywords: distributed power system; quasi-Z-source power converter; virtual inertia; virtual synchronous generator; frequency regulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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