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Maximum power point implementation method and device base on three-level step length

A technology of maximum power point and three-level step size, which is applied in photovoltaic power generation, instruments, and electric variable adjustment, can solve problems such as misjudgment and tracking time, achieve rapidity and accuracy, prevent misjudgment, and improve rapidity. Effects of Tracking Properties

Active Publication Date: 2015-12-16
JIANGSU WISCOM TECHNOLOGY CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a maximum power point realization method and device based on a three-level step size, so as to solve the problem that the existing maximum power point realization method cannot balance the misjudgment phenomenon and shorten the tracking time

Method used

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  • Maximum power point implementation method and device base on three-level step length
  • Maximum power point implementation method and device base on three-level step length
  • Maximum power point implementation method and device base on three-level step length

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Embodiment Construction

[0038] In order to better illustrate the present invention, the present invention will be described in detail with a preferred embodiment and with accompanying drawings, specifically as follows:

[0039] Such as figure 1 As shown, it is a schematic diagram of the composition and structure of the maximum power point realization device based on the three-level step size provided by the present invention, including:

[0040] The sampling module 101 is used to sample the output voltage and output current of the photovoltaic array of the system, U(k) represents the output voltage of the kth (k=0,1,2,...,k) sampling, I(k) Indicates the output current of the kth (k=0,1,2,...,k) sampling, and calculates P(k) according to U(k) and I(k);

[0041] The power tracking selection module 102 is used to judge whether U(k) is less than Um, if so, then start the constant voltage method tracking module, otherwise start the disturbance observation method tracking module;

[0042] The constant vo...

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Abstract

The invention provides a maximum power point implementation method based on three-level step length. The method comprises the steps that after the process of tracking a maximum point is started, on the situation of being far away from the maximum power point, priority detection and selection are conducted on whether a constant voltage method is adopted or not to conduct rapid tracking, and the rapid tracking property of a system is improved; on the situation of being close to the maximum power point, a three-level changeable step length perturbation and observation method is adopted, different disturbance steps are selected according to set disturbance direction flag bits, and accurate tracking of maximum power is conducted. The method has the advantages that the method can be suitable for preventing misjudgment on the situation of bad change of the external environment; compared with a conductance increment method, control and operation are easy, and the requirement on hardware is low; by means of the method, rapidity and accuracy of the tracking can be achieved.

Description

technical field [0001] The invention relates to a method for realizing a maximum power point of a solar photovoltaic cell, in particular to a method and a device for realizing a maximum power point based on a three-level step. Background technique [0002] The output characteristic curve of solar photovoltaic cells has nonlinear characteristics, and it is difficult to guarantee its high efficiency. This requires its analysis and detection to ensure the maximum output power of photovoltaic cells under the conditions of external ambient light and temperature changes, and avoid waste of resources. On the premise of ensuring the high efficiency of the photovoltaic power generation system, it is necessary to track the maximum power point of the photovoltaic cell, that is, the maximum power point tracking, and an external control strategy can be used to detect and control it. In addition, what method to use to control the maximum power point has always been a research hotspot. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 张佑鹏
Owner JIANGSU WISCOM TECHNOLOGY CO LTD
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