A photovoltaic inverter with dynamic adjustment function of AC and DC

Abstract

The present invention belongs to the solar photovoltaic power generation field, in particular to a photovoltaic inverter possessing an AC / DC dynamic adjustment function. According to the technical scheme of the present invention, on the condition of not increasing the cost within the set string type and centralized cost ranges basically, and by considering the advantages of the centralized-distributed photovoltaic inverters simultaneously, the defects that a power interval is lower in output, the efficiency of an inverter circuit is lower and the loss is large, can be improved effectively. The inverters only operate to generate power after reaching certain powers, and the efficiency can reach 97% or more only at the large-power operation, so that according to the technical scheme of the present invention, by supplying power to the 1 / 2 inverters intensively at the time quanta of lower power generation power at the initial stage and the last stage of the photovoltaic morning and evening time periods, the electric quantity of the inverters are doubled, and the inverters operate in advance to generate power while working, and accordingly, the system loss is reduced substantially, the abandoned power at the time period is solved effectively, the self-consumed electric energy of the inverter circuit at the power interval of lower output is reduced, and the income from investment is increased.

Description

technical field

[0001] The invention belongs to the field of solar photovoltaic power generation, and in particular relates to a photovoltaic inverter with an AC / DC dynamic adjustment function. Background technique

[0002] With the continuous advancement of solar power generation technology, the photovoltaic power generation system has changed from a simple off-grid solar-storage inverter integrated machine to a centralized grid-connected photovoltaic inverter; with the continuous expansion of solar power generation scale, the power of the centralized inverter It is also increasing. The photovoltaic modules are connected to the centralized inverter in parallel with multiple strings, and the MPPT maximum power tracking is performed uniformly. The system structure is as follows: figure 1 As shown in (a), such a 500KW photovoltaic power generation system only needs a 500KW centralized inverter, and the grid connection is simple and low cost. However, due to the difference in t...

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