Detailed Photovoltaic Inverter

October 07, 2024

Photovoltaic inverters generally include power station photovoltaic inverters, string photovoltaic inverters, and micro-inverters. Power station type photovoltaic inverter, power range from 30KW-1000KW, even larger. Mainly used in large commercial roofs, industrial plants, and large-scale ground photovoltaic power plants. Power station PV inverters are mainly based on a three-phase bridge circuit topology, and include both transformerless and transformer types.

String type photovoltaic inverter, power range 1KW-30KW, mainly used in residential roof and some small commercial roofs. The string-type photovoltaic inverter single-phase products mainly consist of a boost circuit and a single-phase transformerless topology, and the three-phase products mainly include a boost circuit and a three-phase three-level transformerless topology.

The power of the micro-inverter is 200W-500W, which is mainly applied to curtain walls, window sills, and small roofs. The micro-inverter can be used with a single component structure to individually track the maximum output power of each component for optimal performance. In addition, the problem of shielding can also be improved and the efficiency and reliability of the solar photovoltaic system can be improved.

PV inverter main technical indicators

The conversion efficiency of photovoltaic inverters is demanding, and the level of conversion efficiency will directly affect the amount of electricity generated by the solar power system during the life cycle. According to different models, the conversion efficiency of international first-class brand products can reach more than 98%. The high-power photovoltaic inverter can achieve a conversion efficiency of 98.7%, and the maximum power tracker (MPPT) efficiency can reach 99.9%.

The photovoltaic inverter has a long service life and high reliability. The design life of photovoltaic power generation system is generally about 20 years, so the design life of photovoltaic inverters needs to reach a relatively high level. At the same time, if the photovoltaic inverter fails, it will cause the photovoltaic power generation system to stop and bring economic losses. Therefore, high reliability is an important technical indicator of photovoltaic inverters.

The DC voltage range of the photovoltaic inverter is to be wide and meets the grid connection requirements. In practical applications, a plurality of solar battery modules are connected in series to obtain a higher DC voltage, which is input to the photovoltaic inverter after multiple sets of parallel connection. Different power, different voltage components, and different combinations of series and parallel schemes require that the PV inverter be able to adapt to different DC voltage inputs. Therefore, the DC operating voltage of PV inverters should be wide to meet the different needs of customers. The current output at the same time can not cause impact on the power grid and meets the grid connection requirements.

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