Method for realizing simulation circuit based on double linear approximate value MPPT (Maximum Power Point Tracking) algorithm

Abstract

The invention discloses a method for realizing a simulation circuit based on a double linear approximate value MPPT (Maximum Power Point Tracking) algorithm. The method is centrally characterized in that the double linear approximate value algorithm is applied; a double linear approximate computation circuit consists of a photosensitive diode and a thermistor, the reference voltage of a maximum power point is computed and outputted according to real-time illumination and temperature, a steady error signal with reference voltage and photovoltaic array real-time voltage is outputted by an adder and a PI (proportional integral) controller, and a duty ratio of a Buck step-down circuit is changed by a PWM (pulse width modulation) voltage comparator, so as to realize the MPPT; and the method comprises five specific steps. The method has the advantage that compared with the conventional MPPT control technique, the principle and the control algorithm are easier, the cost is lower, the vibration on the maximum power point is little, the control precision is high, the response speed is high, and the simulation circuit can be easily embedded into photovoltaic systems with different scales.

Description

technical field [0001] The invention relates to an analog circuit implementation method, in particular to an analog circuit implementation method based on a dual linear approximation MPPT controller control algorithm, and belongs to the technical field of maximum power point tracking 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 power ge...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome the deficiency of above-mentioned technology, provide a kind of analog circuit realization method based on the MPPT algorithm of double linear approximation, can overcome the shortcoming of complex structure and high cost of conventional MPPT control scheme by this scheme, at the maximum power point The vibration is small, the control precision is high, and the speed is fast. The circuit of this scheme has good economic benefits and is easy to be embedded in photovoltaic systems of different scales.

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