Analog circuit implementation method for MPPT (maximum power point tracking) of low-power photovoltaic inverter system

Abstract

The invention discloses an analog circuit implementation method for MPPT (maximum power point tracking) of a low-power photovoltaic inverter system. A single analog multiplier, a peak detector, a voltage compensation comparator with automatic resetting and voltage compensation functions and a D-flip-flop are adopted, and control to the duty ratio of a booster circuit BOOST is applied. The analog circuit implementation method particularly includes steps of acquiring voltage and current signals by a voltage and current signal acquisition device; computing products of the acquired voltage and current signals by an arithmetic unit of the analog multiplier; detecting peak signals by the peak detector; and following the detected peak signals by the peak detector, keeping the peak signals, and the like. A simple analog circuit is set up, quick dynamic tracking and excellent adjusting performance of the system can be realized, and the maximum power point can be tracked within a short time by an MPPT control circuit implemented by the analog circuit even under the condition of sudden change of illumination intensity.

Description

technical field [0001] The invention relates to an analog circuit implementation method, in particular to an analog circuit implementation method based on MPPT calculation of a low-power photovoltaic inverter system; it belongs to the technical field of maximum power point tracking (MPPT) of photovoltaic power generation systems. Background technique [0002] The full name of the MPPT controller is "Maximum Power Point Tracking" (Maximum Power Point Tracking) solar controller, which is an upgraded product of the traditional solar charge and discharge controller. The so-called maximum power point tracking means that the controller can detect the power generation voltage of the solar panel in real time, and track the highest voltage and current value (VI), so that the system can charge the battery with the highest efficiency. The MPPT algorithm is the maximum power point tracking algorithm, which is a commonly used algorithm in photovoltaic circuits. [0003] Photovoltaic pow...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome the deficiencies of the above-mentioned technologies, and provides a method for implementing an analog circuit of a low-power photovoltaic inverter system MPPT, through which the shortcomings of conventional MPPT control schemes, such as complex structure and high cost, can be overcome It also has a good maximum power tracking effect under the condition of continuous mutation of ambient temperature and ambient temperature, and can obtain fast tracking dynamics and good regulation performance during maximum power tracking

Images