Coordinated control strategy for a PV-storage grid-connected system based on a virtual synchronous generator

作     者：Xing Zhang Qian Gao Zixuan Guo Haizheng Zhang Ming Li Fei Li Xing Zhang;Qian Gao;Zixuan Guo;Haizheng Zhang;Ming Li;Fei Li

作者机构：National and Local Joint Engineering Laboratory for Renewable Energy Access to Grid TechnologyHefei University Of Technology193 Tunxi RoadHefei230009P.R.China 

出 版 物：《Global Energy Interconnection》 (全球能源互联网（英文版）)

年 卷 期：2020年第3卷第1期

页      面：52-60页

核心收录：

学科分类：08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：supported by National Natural Science Foundation of China Key program(51937003) 

主　　题：Photovoltaic power generation Energy storage unit Virtual synchronous generator Smooth fluctuation Coordinated control 

摘      要：Due to the characteristics of intermittent photovoltaic power generation and power fluctuations in distributed photovoltaic power generation,photovoltaic grid-connected systems are usually equipped with energy storage *** of the structures combined with energy storage are used as the DC *** the same time,virtual synchronous generators have been widely used in distributed power generation due to their inertial damping and frequency and voltage *** the PV-storage grid-connected system based on virtual synchronous generators,the existing control strategy has unclear function allocation,fluctuations in photovoltaic inverter output power,and high requirements for coordinated control of PV arrays,energy storage units,and photovoltaic inverters,which make the control strategy more *** order to solve the above problems,a control strategy for PV-storage grid-connected system based on a virtual synchronous generator is *** this strategy,the energy storage unit implements maximum power point tracking,and the photovoltaic inverter implements a virtual synchronous generator algorithm,so that the functions implemented by each part of the system are clear,which reduces the requirements for coordinated *** the same time,the smooth power command is used to suppress the fluctuation of the output power of the photovoltaic *** simulation validates the effectiveness of the proposed method from three aspects:grid-connected operating conditions,frequency-modulated operating conditions,and illumination sudden-drop operating *** with the existing control strategies,the proposed method simplifies the control strategies and stabilizes the photovoltaic inverter fluctuation in the output power of the inverter.