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A photovoltaic array maximum power point sliding mode tracking control method and system

A technology of maximum power point and photovoltaic array, applied in control/regulation systems, photovoltaic power generation, instruments, etc., can solve the problems of large maximum power tracking fluctuations, insufficient sensitivity, and affecting the tracking accuracy of the control system

Active Publication Date: 2016-04-13
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0017] However, due to measurement interference in the voltage and current sampling values ​​at the output side of the photovoltaic array, the maximum power tracking of the existing photovoltaic array sliding mode control has large fluctuations, which seriously affects the tracking accuracy of the control system.
In addition, the calculation speed of the algorithm is low, and the sensitivity of the control is not high enough.

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  • A photovoltaic array maximum power point sliding mode tracking control method and system

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Embodiment Construction

[0074] Embodiment of sliding mode tracking control method for maximum power point of photovoltaic array

[0075] The P-U characteristic curve and I-U characteristic curve of the photovoltaic array in the embodiment of the maximum power point sliding mode tracking control method of the photovoltaic array are as follows figure 1 As shown, the abscissa in the figure is the voltage U, the unit is V volts, the left ordinate is the current I, the unit is A ampere, the right ordinate is the power P, the unit is W watts, the solid line in the figure is the PU curve, The dotted line is the IU curve, which is represented by figure 1 It can be seen that when the external environment (such as illumination) and the load of the photovoltaic array are constant, there is a unique maximum power point MPP in the output power of the photovoltaic array. That is, when the load equivalent resistance of the photovoltaic array matches the internal resistance of the photovoltaic array, the output pow...

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Abstract

The invention discloses a photovoltaic array maximum power point sliding mode tracking control method and system. The maximum power point tracking control method for obtaining a switch control signal according to the output voltage and current of a photovoltaic array comprises the steps of conducting moving average filtering pretreatment on voltage and current signals to reduce the influence of sampling measurement interference on maximum power point tracking control precision and increase maximum power point tracking speed, calculating the value of a sliding mode function S2 based on incomplete partial differential, and conducting hysteresis on the switch control signal and obtaining the switch control signal u of 0 or 1 according to the relation between the value of S2 and a set value delta. According to the system, an incomplete partial differential-based sliding mode surface function calculating program and a hysteresis processing program are stored in a single-chip microcomputer, the equivalent load of a DC-DC conversion circuit is adjusted and controlled to be matched with the internal resistance of the photovoltaic array, the maximum power of the photovoltaic array is tracked quickly and precisely, the structure is simple, cost is low, and implementation is easy.

Description

technical field [0001] The invention relates to a photovoltaic array maximum power point tracking technology, in particular to a photovoltaic array maximum power point sliding mode tracking control method and system. Background technique [0002] As a strategic industry to solve the increasingly prominent energy and environmental problems of human beings, the photovoltaic power generation industry is developing rapidly, which in turn promotes the rapid development of the solar photovoltaic industry. However, at present, the cost of solar photovoltaic power generation system is high, the photoelectric conversion efficiency of photovoltaic array is low, about 18%, and its output power is affected by the external environment such as light, temperature and load, and its nature is unstable. These all hinder the development of photovoltaic industry. [0003] At present, there are three main technologies for improving the efficiency of photovoltaic power generation: concentrating t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 党选举杨阳姜辉伍锡如张向文朱国魂李爽
Owner GUILIN UNIV OF ELECTRONIC TECH
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