An integrated control algorithm of power distribution for islanded microgrid based on improved virtual synchronous generator

• Main Authors: Liang Zhang, Hao Zheng, Tao Wan, Donghan Shi, Ling Lyu, Guowei Cai
• Format: Article
• Language: English
• Published: Wiley 2021-09-01
• Series: IET Renewable Power Generation
• Online Access: https://doi.org/10.1049/rpg2.12191

Abstract Virtual synchronous generator technology can effectively improve the anti‐interference characteristics of the system frequency and bus voltage in the microgrid, and solve the problems of insufficient damping and low inertia of the system. However, in an islanded microgrid with multiple distributed generation, the difference in line impedance will cause local voltage deviations, which in turn leads to a series of problems, such as reducing power distribution accuracy and increasing bus voltage drop. Therefore, for the island‐type microgrid multi‐inverter distributed power generation parallel system, in order to solve the problem of low power distribution accuracy and large frequency oscillation caused by system parameters in virtual synchronous generator control, an improved virtual synchronous generator control algorithm based on adaptive droop coefficient is proposed in this paper, which not only eliminates the resistance component of the line impedance, makes the system impedance characteristic present a purely inductive nature, but also realises real‐time adjustment of active and reactive power. While maintaining the stability of the bus voltage and system frequency, it maintains high power distribution accuracy and improves the dynamic performance and operational stability of the power grid system.