In recent years, renewable energy power generation technology has been rapidly developing. However, renewable energy power generation is often affected by weather, sunshine duration, wind speed, power transmission and distribution, and often faces problems such as instability, which has a significant impact on the power grid. With the increase in penetration rates of photovoltaic and wind power, their natural randomness, volatility, and small inertia through grid connection through power electronic devices make it inevitable to deeply integrate wind and solar power generation with energy storage.

Energy storage is an important technology and basic equipment that supports new power systems. It can significantly improve the consumption level of renewable energy such as photovoltaic and wind power, support distributed electricity and microgrids, and is a key technology to promote the replacement of main energy from fossil fuel energy to renewable energy. It is an important foundation and key technology for the development of new energy, and its importance and demand have also significantly increased.

Due to the convenience of photovoltaic power generation, "photovoltaic energy storage" will lead the adjustment of the global energy structure in the future. The important condition for deep integration of optical storage is the development of inverter technology, photovoltaic cell technology, and various energy storage media.

Introduction to Solar inverter and energy storage converter
Solar inverter is the key equipment to connect the PV system and the power grid, ensure the long-term reliable operation of the power station and improve the return on investment of the project.

The basic function of the Solar inverter is to control the high-frequency switch of power devices such as IGBT and MOSFET through the control system, convert the DC output from the photovoltaic cell into AC, and meet the power quality requirements for grid connection or the use requirements for load connection. The performance of Solar inverter will have a direct impact on the operation stability, power generation efficiency and service life of the entire photovoltaic system. According to power and purpose, Solar inverter can be divided into household (3kW~30kW), series (1kW~325kW), distributed (500kW~1.25MW) and micro inverter (200W~2.5kW). The main difference between these four categories lies in the individual capacity of the inverter and the number of photovoltaic modules directly connected to the inverter, which have different application scenarios.

The energy storage system needs to be connected to the power grid through an energy storage converter. Energy storage converters are divided into household use (≤ 25kW), commercial use (20kW~325kW), centralized type (220kW~1.25MW), and energy storage power plants (≥ 1MW, up to 200MW and above in parallel) based on power and purpose. Energy storage inverters, also known as energy storage inverters, are commonly used for household use. The large-scale industrial and commercial energy storage system, commonly known as the PCS (Power Conversion System), is a device connected between energy storage batteries and the power grid to achieve bidirectional energy conversion. The energy storage converter can invert the direct current in the energy storage battery into alternating current and transmit it to the power grid by controlling power devices such as IGBT, MOSFET (including SiC), and supporting driver chips. Alternatively, AC power in the power grid can be rectified into DC power to charge the energy storage system.

High efficiency, high power density, long-term reliability, and low system cost are the continuous goals pursued by inverters and converters. As a leading power semiconductor manufacturer in China, Jufeng Semiconductor continues to provide efficient, reliable, high-quality, and cost-effective products for optical storage applications.

For 1000V series Solar inverter, Jufeng Semiconductor currently has:

1. 650V/450A three-level F2 packaged IGBT module for designing NPC1 ("I" type) three-level systems (above 80kW)

2. 650V IGBT single transistor (maximum 160A/650V/TO247PLUS, with specialized product introduction later) is used for designing NPC1 ("I" type) three-level inverter circuits, or as a horizontal transistor for NPC2 ("T" type) inverter circuits.

For 1000V centralized Solar inverter and 1500V (MW level) system energy storage converter, Jufeng Semiconductor currently has:

1. 1200V/600A half bridge E3 packaging (compatible with mainstream application packaging) IGBT modules are used for designing NPC1 type ("I" type) or ANPC three-level systems.

2. 1200V/450A half bridge E3 packaging (compatible with mainstream application packaging) IGBT modules are used for designing NPC1 type ("I" type) or ANPC three-level systems.

The above IGBT module products have the advantages of low loss, high reliability, and good compatibility. For applications that require module parallel connection, Jufeng Semiconductor also has corresponding product design and control, as well as recommended solutions from supporting driver board manufacturers.

Application Plan
IGBT module is used for the inverter circuit of Solar inverter (1000V system) and energy storage converter (1500V system) in the optical storage system

With the development and demand of optical storage products, Jufeng Semiconductor will continue to introduce 1200V NPC1 topology IGBT modules and SiC modules suitable for 1500V systems, 750V/1200V 100A and above IGBT single transistors, and isolation drive chips compatible with optocoupler solutions.