Solar Inverter

Classification of Photovoltaic Inverters

  • 2022-01-21 16:34:12

Energy storage system integrate the functions of grid-connected photovoltaic power generation + energy storage power stations, storing electricity when it is in surplus and inverting the stored electricity to output to the grid when it is in shortage, playing the role of peak shaving and valley filling, which is one of the main development directions in the future.


The PV inverter is the control centre of the PV power generation system and can convert the DC power generated by the modules into AC power for grid connection or load use. The PV inverter is mainly composed of a power conversion module, a microcomputer control module, an EMI module, a protection circuit, a monitoring module and a human-machine interaction module, etc. Its development depends on the development of electronic circuit technology, semiconductor device technology and modern control technology.


Photovoltaic inverters can be divided into centralized, string and micro inverters according to their working principle. Due to the different working principles of each type of inverter, the application scenarios are also different.


(1) The centralized inverter converges first and then inverts, which is mainly suitable for large centralized power station scenarios with uniform light.

The centralized inverter first converts multiple parallel strings to the DC input and then converts them centrally to AC power after tracking the maximum power peak, usually with a single capacity of 500kw or more. Due to the high integration and power density of the centralized inverter system, the cost is low and it is mainly used in large centralized PV plants such as large plants with uniform sunlight and desert power stations.


(2) String inverters are mainly suitable for small and medium-sized rooftop and small ground-mounted plants.

The string inverter is based on the modular concept. After individual maximum power peak tracking of 1-4 strings, the DC power generated by them is first inverted into AC power, and then converged and boosted and connected to the grid, so the power is smaller compared to the centralized type, but the application scenario is more abundant.



(3) Micro-inverters are directly inverted and connected to the grid, mainly suitable for household and small distributed scenarios.

Compared to the first two types of inverters, they are the smallest in size and the smallest in power, generally under 1kw, and are mainly suitable for distributed household and small distributed commercial and industrial rooftop power stations, but are expensive and difficult to maintain in case of failure.



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