Photovoltaic module circuit, photovoltaic module and photovoltaic power station

Abstract

The invention provides a photovoltaic module circuit, a photovoltaic module and a photovoltaic power station and is applied to the technical field of power electronics. The circuit comprises a plurality of first photovoltaic sub-strings, at least one first unidirectional conduction branch and at least one second unidirectional conduction branch, wherein the first photovoltaic sub-strings are formed by connecting a preset number of battery pieces in series, the first photovoltaic sub-strings are connected in series, series branches are formed, each first one-way conduction branch is reversely connected in parallel with at least one first photovoltaic sub-string in the series branch, the second one-way conduction branch is reversely connected in parallel with the second photovoltaic sub-string, the second photovoltaic substring is composed of battery pieces in the predicted occlusion area in the series branch, when the second photovoltaic sub-string is shielded, the corresponding secondone-way conduction branch bypasses the second photovoltaic sub-string. Compared with a mode of cutting off the whole first photovoltaic sub-string in the prior art, the circuit only cuts off the shielded battery pieces, the power generation capacity of the photovoltaic module can be kept to the maximum extent, and the overall power generation capacity of the photovoltaic module is ensured as muchas possible.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a photovoltaic module circuit, a photovoltaic module and a photovoltaic power station. Background technique [0002] The hot spot effect caused by shading has always been the most influential and common problem in the application of photovoltaic modules. see figure 1 , figure 1 It is a circuit topology diagram of a common photovoltaic module in the prior art. A photovoltaic module includes several cells connected in series to form photovoltaic substrings shown in S1-S6. Each photovoltaic substring is also connected in sequence to form a photovoltaic module to generate electric energy core part. When the lower part of each photovoltaic sub-string in the photovoltaic module (shown by dark cells in the figure) is shaded, the output voltage of the shaded cells decreases, and the output current decreases. In this case, the shaded cells will wait The effect is an electric...

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Problems solved by technology

like figure 1 As shown, this local small-scale shading affects only some cells in the photovoltaic module, and the rest of the cells that are not shaded can still work normally, while the bypass diode of the photovoltaic module in the existing Cutting off photovoltaic substrings may even cause the entire photovoltaic module to stop working, which will seriously affect the power generation of photovoltaic modules

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