Maximum power point tracking device of solar assembly

Abstract

The invention discloses a maximum power point tracking device of a solar assembly, which comprises a control module, a selection module and a power supply module for supplying power to the control module and the selection module, wherein the control module is provided with a single chip machine, bypass diode current signals and assembly short-circuit current signals are respectively supplied to the input end of the single chip machine; the selection module comprises a common MPPT (Maximum Power Point Tracking) module, a second relay, a double-peak MPPT module, a first relay and a reverser, wherein the common MPPT module is connected with the output end of the single chip machine after being connected with the second relay in series, the double-peak MPPT module is connected with the outputend of the reverser after being connected with the first relay in series, and the input end of the reverser is connected with the output end of the single chip machine. By utilizing a current controlmodule for comparing monitored bypass diode current with solar assembly short-circuit current, the maximum power point tracking device realizes intelligent tracking of the maximum power point of the solar assembly, thereby improving tracking accuracy and simultaneously reducing energy consumed by tracking the maximum power point.

Description

technical field [0001] The invention relates to the technical field of solar power generation, in particular to a tracking device for tracking and measuring the maximum power point of a solar module. Background technique [0002] Solar cell modules are usually composed of multiple cells connected in series, and bypass diodes are provided to prevent hot spots in the module under shaded conditions. The output characteristic of the solar cell module is non-linear. In the case of uniform irradiance, the output power first increases and then decreases with the increase of the output voltage. In order to improve the output power of the solar cell module, control the instantaneous output power so that it can work at the maximum power point under any conditions, that is, the measurement and tracking of the maximum power point (MPPT) is required. When the module containing the bypass diode is shaded, its performance curve will change, and double-peak or even multi-peak phenomenon wi...

AI Technical Summary

Problems solved by technology

When the module containing the bypass diode is shaded, its performance curve will change, and double-peak or even multi-peak phenomenon will appear. The method of tracking the maximum power point of the solar module only based on the single-peak phenomenon cannot fully meet the requirements. Therefore, at present, the bimodal tracking method is often used to make it output the maximum power of the solar module array. However, when the components are not shaded, the bimodal tracking is meaningless. Tracking time also consumes additional power, resulting in a decrease in the overall power generation of the solar power system

To sum up, in the case of solar modules containing bypass diodes with or without shading, due to their different performance curves, the tracking methods of the selected maximum power points are also different, and a single tracking method cannot fully satisfy the tracking requirements. Requirements for the maximum power point of solar modules

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