Research on Control Strategy of Grid-Connected Converter Based on Virtual Inertia

2019 4th Asia Conference on Power and Electrical Engineering

能源学;电工学

Ke, Wang^1 ; Guangzhu, Wang^1 ; Chengxi, Li^2

Shandong University, Shandong Province, Jinan, China^1

University of Science and Technology of China, Anhui Province, Hefei, China^2

关键词: Control strategies;    Dynamic characteristic analysis;    Fluctuation of dc bus;    Function block diagram;    Grid-connected converters;    Inertial parameters;    Signal decomposition;    Synchronous machine;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/486/1/012008/pdf
DOI  :  10.1088/1757-899X/486/1/012008

来源: IOP

【 摘 要 】

As the DC microgrid has low inertia, this paper draws on the virtual synchronous machine technology to propose and control a new virtual inertial control strategy. This control strategy enables the grid-connected converter to have both AC inertia and DC inertia. By small signal decomposition, the transfer function block diagram of the system is established. The effects of different inertial parameters on the system's AC inertia and DC inertia are studied. The dynamic characteristic analysis and simulation results show that the proposed virtual inertial control can effectively suppress the fluctuation of DC bus voltage and AC power and increase the AC and DC inertia of the converter.