Types and development trends of inverters used in PV power generation

　　In 2020, the global PV industry will add about 130GW of new installed capacity, and the market's demand for PV inverters will continue to grow. From the perspective of the types of products required, ordinary users still prefer string inverters globally, and centralized inverters are used in large ground power stations.

　　String inverter

　　But we need to know that the application of string inverters in large ground power stations has become more and more common. According to the survey and statistics of a third-party organization, the large-scale PV power stations in the US market are dominated by centralized inverters, and the market share of products with a power level of more than 500kW is close to 80%; the Vietnamese market is dominated by rooftop PV power generation, with a power level of 20kW-500kW The product market share exceeds 70%; the Japanese market is dominated by individual users and the industrial and commercial markets, with a market share of nearly 70% for power grade products below 500kW; the European market is dominated by string inverters, with a market share of power grade products below 500kW The rate exceeds 75%.

　　Centralized inverter

　　Inverter companies have reduced the manufacturing cost per watt by developing high-power inverter products, while introducing digital technology to improve the performance of inverter products in different application scenarios and reduce operating costs.

　　With its outstanding advantages in reducing investment costs, the 1500V system has gradually become the mainstream solution for large-scale ground power stations. With the maturity of technology and the improvement of market acceptance, the 1500V system has become an important weapon for reducing costs and increasing efficiency of large-scale PV power plants. In low electricity price regions such as India and Latin America, almost all of the large-scale PV power plant bidding adopts the 1500V scheme, and the electricity markets in developed countries such as Europe and the United States have also switched from the 1000V system to the 1500V system.

　　The reliability, efficiency and cost of PV inverters are the core indicators. Around these three core indicators, the current main development direction of inverter technology is to improve reliability, voltage, power generation, friendliness, intelligent level, power level, and degree of integration.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect replacement for lead-acid batteries, and they are the first choice for grid-connected peak shaving, off-grid energy storage, PV energy storage, UPS, data center and other industries.

　　Solar power generation system with lithium battery energy storage system is a very promising clean energy.