Method for testing maximum power point tracing algorithm performance of solar photovoltaic power generation system

Abstract

The invention relates to a method for testing the maximum power point tracing algorithm performance of a solar photovoltaic power generation system. The method comprises the steps: converting a duty ratio of a pulse width modulation signal output by a measured algorithm in direct proportion into a PWM signal conversion unit of a direct current voltage signal UPWM; transferring and executing the measured algorithm by a control unit, collecting UC and UV and transferring the UC and UV to a tested maximum power point tracing algorithm, wherein the PWM signal duty ratio is adjusted by the algorithm; outputting the PWM signal to the PWM signal conversion unit through a driving circuit and changing the UV by adjusting the magnification time of the voltage signal conversion unit; and detecting a duty ratio numerical value by the control unit once the duty ratio of the PWM signal is adjusted stable by using the measured algorithm so as to obtain the tracking precision of the maximum power point tracing algorithm, and recording the time duration when the duty ratio output by the measured algorithm is stable again after the KV numerical value is changed. According to the method provided by the invention, the equipment purchasing cost for implementing test by adopting a program-controlled power supply is lowered, the development cost of a photovoltaic power generation system is lowered and the time of the photovoltaic power generation system is shortened.

Description

technical field [0001] The invention relates to a method for testing the performance of a maximum power point tracking algorithm, which belongs to the technical field of solar photovoltaic power generation. Background technique [0002] In a solar photovoltaic power generation system, when the ambient temperature is fixed, the power generated by a photovoltaic cell mainly depends on the current light intensity. However, the actual output power of the photovoltaic cell is equal to the product of its output current and output voltage, which is not equal to the power generation of the photovoltaic cell in most cases. The voltage-current output characteristics of photovoltaic cells determine the existence of the maximum output power point. In order to obtain the energy generated by the photovoltaic cell with maximum efficiency, there is a DC-DC converter, such as a Buck step-down converter, and the charging controller adopts the maximum power point tracking algorithm to change ...

AI Technical Summary

Problems solved by technology

Existing methods can give accurate power difference results in the steady-state performance test, but in the tracking speed test, since the programmable power supply only displays the power curve, it is necessary for the staff to read the tracking time when it reaches stability from the power curve. The testing process is complicated and there are large errors

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