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

A technology of linear approximation and realization method, applied in photovoltaic power generation, regulation of electrical variables, instruments, etc., can solve the problems of high control precision, complex structure, high cost, etc., and achieve the effect of high control precision, fast response speed and low cost

Inactive Publication Date: 2013-04-10
易霸科技(威海)股份有限公司 +1
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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 cos...

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

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Embodiment Construction

[0018] Depend on image 3 As shown, the components of the present invention mainly include: a photovoltaic array 1 , a Buck step-down circuit 2 , a dual linear approximation operation circuit 3 , an adder 4 , a PI regulator 5 and a PWM voltage comparator 6 .

[0019] The photovoltaic array 1 provides a DC source for the entire system, changing the duty cycle of the Buck step-down circuit 2 can track the maximum power point of the photovoltaic system, and the dual linear approximation calculation circuit 3 can accurately calculate the maximum power point of the array under real-time light and temperature conditions The reference voltage at the place, through the adder 4 to realize the calculation of the reference voltage and the real-time voltage error, and then through the PI regulator 5 to adjust the error of the output steady state, through the operation of the PWM voltage comparator 6, to change the duty of the Buck step-down circuit 2 Ratio, so that the system voltage runs...

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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...

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Application Information

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IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 李支柱张晓彬王锋夏勇
Owner 易霸科技(威海)股份有限公司
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