A sliding-mode control system for maximum power tracking of photovoltaic arrays under partial shading
A technology of maximum power tracking and photovoltaic array, which is applied in the direction of control/regulation system, photovoltaic power generation, instruments, etc., can solve the problems of sliding mode control application, reduce power fluctuation, reduce steady-state power fluctuation, enhance The effect of versatility
Active Publication Date: 2017-11-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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But there is no application of sliding mode control in MPPT control under partial shadow conditions
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[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0047] The technical solution provided by the invention includes two parts: (1) a maximum power tracking method based on sliding mode control; (2) a power scanning method based on sliding mode control. First, the sliding mode power scanning method is used to scan the output power of the photovoltaic array to obtain the global maximum power point, and then the sliding mode maximum power tracking method is used to stabilize the output power of the photovoltaic ar...
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The invention discloses a sliding-mode control system for maximum power tracking of a photovoltaic array in local shadow. According to the sliding-mode control system, firstly, an output power curve of the photovoltaic array is scanned, the global maximum power point is recorded, sliding-mode control is introduced in the process, and the scanning time is shortened; the operation point of the photovoltaic array is rapidly stabilized at the maximum power point with a sliding-mode maximum power tracking method, and power fluctuation during steady-state operation is reduced. Besides, a novel open-circuit voltage detection method is proposed, can be implemented during power scanning and doesn't occupy extra time. The control system can realize the maximum power tracking of the photovoltaic array under the local shadow condition and has the good dynamic response performance, the power loss in the whole tracking process is reduced, and the efficiency of the whole photovoltaic power generation system is improved.
Description
technical field [0001] The invention relates to the field of photovoltaic control, in particular to a photovoltaic array maximum power tracking sliding mode control system under partial shadow. Background technique [0002] Photovoltaic power generation technology has received extensive attention due to its advantages of cleanliness and ease of use. However, photovoltaic power generation also has the disadvantage of low efficiency, which hinders its development. At present, MPPT control is one of the basic measures to improve the efficiency of photovoltaic power generation. Conventional perturbation observation method, conductance incremental method, etc. can track the maximum power point of photovoltaic array under uniform illumination. However, due to changes in the external environment, partial shadows appear on the photovoltaic array, making the output curve of the photovoltaic array present a multi-peak characteristic. At this time, the conventional MPPT control tend...
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IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 朱晓荣刘世鹏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)