Energy storage converter, also known as bidirectional energy storage inverter, English name PCS (Power Conversion System), is used in grid-connected energy storage and micro-grid energy storage and other AC-coupled energy storage systems to connect battery packs and power grids (or Load) is a device that realizes two-way conversion of electric energy. It can not only invert the DC power of the storage battery into AC power, and transmit it to the grid or use it for AC loads; it can also rectify the AC power of the grid into DC power to charge the battery.
The power storage converter (PCS) is composed of software and hardware circuits such as power, control, protection, and monitoring. Divided into single-camera and three-camera, single-phase PCS usually consists of a bidirectional DC-DC step-down device and a DC/AC converter. The DC terminal is usually 48Vdc and the AC terminal is 220Vac. The three-phase PCS is divided into two types. The low-power three-phase PCS is composed of a bidirectional DC-DC buck-boost device and a DC/AC AC-DC conversion two-stage device. The high-power three-phase PCS is composed of a DC/AC AC-DC conversion first-stage device. Energy storage converters are divided into three types: high-frequency isolation, power frequency isolation and non-isolation. Single-phase and low-power three-phase PCS below 20kW generally adopt high-frequency isolation, and 50kW to 250kW generally adopt power frequency isolation. , 500kW and above generally adopt the method of non-isolation.
Important technical parameters of energy storage converters: Due to different application occasions, the functions and technical parameters of energy storage converters are quite different. When selecting, attention should be paid to system voltage, power factor, peak power, conversion efficiency, switching time, etc. , the selection of these parameters has a great influence on the function of the energy storage system.