TYPICAL SOLUTIONS FOR C&I PV STORAGE & CHARGING
2.3
EQUIPMENT SELECTION
Storage System (PCS+Battery) 2.3.3 CHINT ESS is committed to the convenient, efficient and stable energy, to create a safer and sustainable operating environment. The electricity cost is different in most areas in the whole day. And it is more expensive in the daytime. The promotion purpose of the energy storage system is to encourage users to develop smart power plans. To keep the safety and stability for the grid supplier, to avoid more loss at the generation side. Charging at low price and discharging at high price, to reduce the electricity cost. Energy storage converter, also known as two-way energy storage inverter, English name PCS (Power Conversion System), used in AC coupled energy storage systems, it is a device that realizes two-way conversion of electric energy, such as convert the battery's DC current into AC current, and then send it to the grid or AC loads, or convert the AC current into DC current to in charge the battery. PCS has two working modes: on-grid and off-grid. The grid-connected mode realizes the two- way energy conversion between the battery pack and the grid. It has the characteristics of grid-connected inverters, such as anti-islanding, automatic tracking of grid voltage phase and frequency, low voltage ride-through, etc. It can be dispatched according to the grid or local control. Off-grid mode, also known as isolated grid operation, is to disconnect from the main grid when the set requirements are met, and to provide partial loads with AC power that meets the power quality requirements of the grid. The project uses lithium iron phosphate batteries, which have the advantages of high power density, high cycle times, high depth of discharge, high safety, and wide operating temperature range. They are currently widely used in energy storage carriers. The parameter is shown in the figure below. It consists of a battery cabinet and an electrical cabinet. The battery cabinet is equipped with battery modules, a set of BMS, and a high-voltage cabinet.
PCS Cabinet
Battery Cabinet
23 CHINT
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