Photovoltaic array structure based on LLC (logical link control) resonant converter voltage compensation

Abstract

The invention discloses a photovoltaic array structure based on LLC (logical link control) resonant converter voltage compensation, belongs to the field of photovoltaics, and aims to solve the problems that photovoltaic output power is reduced under local shade, a power curve shows multiple-peak variation, and a post-stage single-peak maximum power point is inconveniently traced in the prior art.A photovoltaic portion of the structure comprises a plurality of parallelly connected photovoltaic branches, and the photovoltaic branches comprise blocking diodes, photovoltaic panels and LLC resonant converters which are sequentially serially connected. According to the structure, the voltage on each branch at the maximum power point under normal illumination is kept, photovoltaic integrated power generation is achieved, and maximum power output of the photovoltaic panels is achieved.

Description

technical field [0001] The application belongs to the photovoltaic field, and in particular relates to a photovoltaic array structure based on LLC resonant converter voltage compensation under partial shadow conditions. Background technique [0002] Photovoltaic cells rely on sunlight to generate electricity. On cloudy days or under special circumstances, shelters will cover photovoltaic panels and form partial shadows. Partial shadows lead to a drop in the output voltage and power of the PV panel. Because scattered light cannot provide the voltage and power to maintain normal light, the power curve presents multi-peak changes. The incremental conductance method cannot effectively track the maximum power point. The Monte Carlo algorithm can be used to achieve multi-peak tracking, but the calculation is too cumbersome. Therefore, it is necessary to optimize the structure of the photovoltaic array to maintain the output voltage of the PV panel when it is working normally. And...

AI Technical Summary

Problems solved by technology

Partial shadows lead to a drop in the output voltage and power of the PV panel. Because scattered light cannot provide the voltage and power to maintain normal light, the power curve presents multi-peak changes. The incremental conductance method cannot effectively track the maximum power point. The Monte Carlo algorithm can be used to achieve multi-peak tracking, but the calculation is too cumbersome. Therefore, it is necessary to optimize the structure of the photovoltaic array to maintain the output voltage of the PV panel when it is working normally. And the structure can still keep close to the single peak of the output power, which is beneficial for the subsequent stage to track the maximum power point of the single peak

Images