PV inverters are divided into centralized inverters, distributed inverters, string inverters and micro-inverters according to the applicable places. I believe everyone is not very clear about the difference between centralized and string inverters. Today we will mainly talk about distributed photovoltaic inverters. Distributed photovoltaic power generation solutions refer to: decentralized MPPT optimization, centralized grid connection In the form of power generation, a multi-channel MPPT optimization function is realized by leading multiple MPPT control optimizers, and a new, high-efficiency photovoltaic power generation solution using centralized inverter inversion after confluence.
With the introduction of this solution, power station investors have a third option in addition to centralized and string-type. At present, there are not many domestic companies that have distributed solutions and are investing in projects. Wuxi Shangneng and Shenzhen Hewang can be regarded as representatives of such technologies. The distributed photovoltaic power generation solutions pushed by the capacity are higher than the centralized inverter solutions. The power generation income is higher, and the cost is lower than the string-type inverter solution, which can increase the system power generation by 2% to 5%. As a major innovation of the traditional inverter, the distributed scheme has been unanimously approved by the owners of Tongmei Coal, China Energy Conservation, Huadian, Three Gorges New Energy, and Zhengtai in the Datong leader demonstration base project, and has been applied on a large scale. In the distributed scheme, the DC transmission voltage is increased to 800Vdc, and the AC output voltage is increased to 520Vac. The cost of AC and DC cables is greatly reduced; 2MW large-capacity sub-array networking can be realized, further reducing system costs.
Distributed inverters to achieve cascade-level MPPT, higher power generation in complex mountain power stations; increase DC and AC transmission voltage, reduce line loss over long distance transmission; flexible configuration ratio, further reduce system cost; stand-alone capacity 1MW, can The amount of sub-lineups can be flexibly configured according to the terrain; centralized grid connection, better adaptability of the power grid, and by virtue of power generation capacity and system cost advantages, it will become the mainstream among mountain leader power stations.
With the rapid growth of the distributed photovoltaic market and the increase in the proportion of string inverters in centralized photovoltaic power plants, the string inverters accounted for 60.4% of the market in 2018. The distributed photovoltaic inverter improves the MPPT control effect compared to the centralized inverter, and has a lower construction cost than the string inverter solution. Therefore, the market share is showing an upward trend year by year. The market share of different types of inverters in 2018-2025 is shown in the figure below.
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