MPPT algorithm simulation method based on extrapolation and chasing iteration method

A simulation method and iterative method technology, applied in the simulation field of the MPPT algorithm of the extrapolation and chasing iterative method, can solve the problems affecting the stable operation of the system, the limitation of the precision sensor, the misjudgment of the maximum power point, etc., and achieve the effect of excellent stability.

Active Publication Date: 2017-05-31
南通大学技术转移中心有限公司
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Problems solved by technology

Although the above algorithm has a good tracking effect under the changing conditions of the system environment, the control accuracy is often limited by the accuracy of the sensor itself.
For example, the open circuit voltage method: the control algorithm of the system is simple, there will be no oscillation phenomenon, and the stability is good, but the control accuracy is very low; the maximum gradient method: when the external environment changes drastically, such as the moment of shadow occlusion, it is easy to cause the system control process Misjudgment of the maximum power point affects the stable operation of the entire system; disturbance observation method: the control loop adopts modularization, the tracking effect is simple and clear, and it is easy to implement. Fluctuates near the power point, which causes a part of power loss

Method used

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  • MPPT algorithm simulation method based on extrapolation and chasing iteration method
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  • MPPT algorithm simulation method based on extrapolation and chasing iteration method

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Embodiment Construction

[0053] A kind of simulation method of the MPPT algorithm of extrapolation catch-up iteration method, comprises the following steps:

[0054] (1) Using the variable step size extrapolation method as the actual control process algorithm, the process is as follows:

[0055] Step 1: Given an arbitrary step size, calculate the integral approximation using the trapezoidal formula

[0056] Among them: T 1 is the value obtained by the trapezoidal quadrature formula; a and b are the two endpoints of the interval; f(a) is the value corresponding to the endpoint a of the interval; f(b) is the value corresponding to the endpoint b of the interval;

[0057] The second step: obtain the approximate value of the integral again by the variable step size extrapolation method. make

[0058] Calculate T at this time 2n :

[0059]

[0060] Among them: h is the step size; T 2n When the interval is divided into 2n equal parts, the value obtained by using the trapezoidal quadrature formu...

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Abstract

The invention discloses an MPPT algorithm simulation method based on an extrapolation and chasing iteration method. The simulation method comprises the following steps: 1) adopting a variable-step extrapolation method as an actual control process algorithm; and 2) carrying out optimization through a chasing iteration method. Through detailed analysis and comparison of data and simulated images realized by a conventional control algorithm, the method has excellent stability, accuracy and rapidity.

Description

technical field [0001] The invention relates to a simulation method of the MPPT algorithm of the extrapolation catch-up iteration method. Background technique [0002] In the current photovoltaic power generation system, it is usually required that the output power of the photovoltaic array is always kept at the maximum, and the maximum power point tracking (MPPT) technology has become an indispensable part of the photovoltaic power generation system. MPPT is to adjust the operating point of the solar cell by changing the system load characteristics in real time, and finally make it work at the maximum power point under different temperatures and sunlight environments. Well-known scholars at home and abroad have proposed a variety of methods for maximum power point tracking, the most common ones are: disturbance observation method, improved conductance increment method, open circuit voltage method, maximum gradient method, constant current tracking method, etc. Among them, ...

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Application Information

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IPC IPC(8): G05B17/02
CPCG05B17/02
Inventor杨奕王建山顾海勤李俊红杨元培张桂红李肖胡海涛
Owner南通大学技术转移中心有限公司