The energy storage System can provide a fast power buffer for the micro-grid, so that the voltage and frequency of the micro-grid can be kept stable, so the role of the energy storage technology in the micro-grid is becoming more and more prominent. The energy storage devices in the micro-grid are various in variety, Energy Storage Systems the installation position is flexible, and under reasonable control, it can provide some support for the stable operation of the micro-grid.
Traditional energy storage methods, such as pumped storage and compressed air storage, Energy Storage Systems which are most widely used in energy storage systems, are undergoing continuous improvement and innovation.
The existing energy storage system is divided into five types: mechanical energy storage, electrical energy storage, electrochemical energy storage, thermal energy storage and chemical storage energy. At present, the world's largest is pumped storage, the total installed capacity of 127GW, Energy Storage Systems the total capacity of 99%, followed by compressed air storage, the total installed capacity of 440MW, the third highest is the sodium sulfide battery, the total capacity of 316MW.
The energy storage System consists of photovoltaic modules, photovoltaic controllers, batteries, battery management system (BMS), Energy Storage Systems inverter and corresponding power plant joint control and dispatch system. PV module Arrays Use photovoltaic effects of solar panels to convert light energy into electrical energy, then charge the lithium battery pack and convert the DC power to alternating current by inverting the search engine to power the load. According to the change of intensity and load of sunlight, the intelligent controller constantly switches and adjusts the working state of the battery group: On the one hand, the adjusted electric energy is sent directly to DC or AC load. On the other hand, the excess energy is sent to the storage battery group. Energy Storage Systems When the power generation does not meet the load requirement, the controller takes the electric energy of the battery to the load, which guarantees the continuity and stability of the whole system. The grid-connected inverter system consists of several inverters, which turn the DC power in the battery into a standard 380V mains access user side low-voltage power grid or a step-up transformer into a high-voltage grid. Energy Storage Systems The lithium battery pack has two functions of energy regulation and balance load in the system. It converts electricity from photovoltaic power systems into chemical energy to be stored for use in the event of insufficient power.