Dec 17, 2020
On the future trend of photovoltaic inverters
1. Overview of the development of China's photovoltaic industry
In recent years, as energy consumption and environmental protection issues have attracted attention, China’s solar photovoltaic power generation industry has shown a rapid development trend, and has gradually formed a situation of industrialization, large-scale, and competitive. Construction has played a positive role. Since 2011, China's annual new photovoltaic installed capacity has maintained rapid growth, and the newly installed capacity has ranked first in the world.
In the early stage of the development of the photovoltaic industry, China’s photovoltaic market developed slowly
2. Overview of the development of photovoltaic inverter industry
Photovoltaic inverter is a power electronic device that connects solar photovoltaic panels and the grid. The main function is to convert the direct current generated by solar panels into alternating current that can be connected to the grid through power modules. It is one of the core equipment in the solar photovoltaic power generation system One. The reliability and safety of photovoltaic inverters are directly related to the smooth operation of the solar power system as a whole. Its conversion efficiency directly affects the power generation efficiency of the solar photovoltaic power generation system, and its service life is directly related to the service life of the photovoltaic power generation system.
The photovoltaic inverter not only has the conversion function of DC to AC, but also has the function of maximizing solar cell performance and photovoltaic power generation system protection. It mainly includes automatic operation and shutdown functions, maximum power tracking control function, and anti-islanding function (grid-connected For system), automatic voltage adjustment function (for grid-connected system), DC detection function (for grid-connected system), DC grounding detection function (for grid-connected system), etc.
Photovoltaic inverters are mainly composed of power modules, control circuits, circuit breakers, filters, reactors, transformers (options), contactors and cabinets, and their technical level mainly depends on power electronics technology, semiconductor device technology and modern control Technology development.
Classification of photovoltaic inverters:
1. According to the number of AC output phases, it can be divided into: single-phase inverter and three-phase inverter.
2. According to the installation environment, it can be divided into: indoor type Ⅰ (with temperature adjustment device), indoor type Ⅱ (without temperature adjustment device), and outdoor type.
3. According to the electrical isolation, it can be divided into: isolated type and non-isolated type.
4. According to the application, it can be divided into: household type, industrial type (such as power station, factory, etc.)
5. According to the scale of use, it can be divided into: power station type grid-connected inverter (used by power stations not less than 1MW) and non-power station type grid-connected inverter.
6. According to the applicable places, it can be divided into: centralized inverter, distributed inverter, string inverter and micro inverter.
In the early stage of the development of the photovoltaic power generation industry, due to the high price of photovoltaic panels, the construction cost and power generation cost of photovoltaic power stations were high, and the power generation was relatively small. In the early stage of development, string photovoltaic inverters were mainly used.
Third, the development trend of photovoltaic inverters
The reliability, conversion efficiency and cost of inverters are the core elements of inverter products. The future development direction of photovoltaic inverters will also focus on these three core elements, mainly towards high reliability, high conversion efficiency and low efficiency. Trends in cost development. At the same time, there are other factors that need to be considered, such as an inverter solution tailored to local conditions, an intelligent inverter solution, and an integrated solar storage inverter solution.
Although the National Development and Reform Commission adjusts photovoltaic benchmark electricity prices every year according to cost changes, according to the requirements of the "Thirteenth Five-Year Plan for Electric Power Development", by 2020, the installed capacity of non-petrochemical energy power generation will reach about 770 million kilowatts, an increase of 250 million from 2015 About kilowatts, accounting for 39%. According to the requirements of the "13th Five-Year Plan for Solar Energy Development", by the end of 2020, the installed capacity of photovoltaic power generation will reach 105 million kilowatts and maintain a stable development scale every year on the basis of the "Twelfth Five-Year Plan". According to the national development plan, the photovoltaic power generation industry will maintain stable development in the future. At the same time, many countries around the world are also vigorously developing photovoltaic power generation. Correspondingly, the market demand for the company's photovoltaic inverter products will maintain steady growth in the next few years.