Intelligent photovoltaic energy storage grid connected power station

　　The purpose of this power station system is to construct a demonstration project for the energy storage and off grid system of Zhongshan Quanmagnesium Energy Technology Co., Ltd. By connecting to real loads such as daily lighting in office buildings, it can demonstrate the normal power supply system under off grid conditions; Demonstration of energy storage using surplus electricity from distributed photovoltaics; And demonstration of backend monitoring and energy scheduling.

　　The energy storage system proposed for this project consists of a lithium battery energy storage system, a control system, a monitoring system, and an energy management system. The control system can achieve remote control of distributed power sources, load devices, and energy storage devices. The monitoring system comprehensively monitors the real-time operation information and alarm information of distributed power sources and conducts multi-faceted statistics and analysis to achieve comprehensive control of distributed power sources. The energy management system can control the smooth output and energy economic dispatch of distributed power sources. The primary topology structure of the system is shown in the following figure:

　　The network structure diagram of energy management and system monitoring is shown in the following figure:

　　The energy management system can achieve off grid switching control based on energy storage and load conditions, as well as switch between several different operating modes of the microgrid system. It can achieve off grid operation control of distributed power sources, monitoring of electrical parameters at the grid connection point, and remote switching control of system loads. Configure a battery management system to estimate the charging and discharging status and battery capacity of energy storage batteries, achieve energy balance control of distributed power sources, and ensure the economic operation of the system. According to the frequency of the AC bus voltage in the microgrid, load classification and disconnection are achieved to ensure the optimization of important loads

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