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Maximum power tracing method and system of photovoltaic system

A maximum power tracking, photovoltaic system technology, applied in photovoltaic power generation, control/regulation systems, instruments, etc., to achieve the effect of improving photovoltaic power generation efficiency, improving robustness, and simple control structure

Inactive Publication Date: 2018-12-21
HAINAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0003] Traditional maximum power tracking methods include perturbation and observation method, conductance incremental method, open circuit voltage method and intelligent control based maximum power tracking method. Through these methods, the maximum power tracking of photovoltaic system can be realized, but each method has different degrees. disadvantages and limitations

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  • Maximum power tracing method and system of photovoltaic system
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  • Maximum power tracing method and system of photovoltaic system

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Embodiment Construction

[0035] In order to better understand the technical content of the present invention, specific embodiments are provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0036] see figure 1, a photovoltaic system maximum power tracking method, comprising the following steps:

[0037] S1. When the photovoltaic power generation system is working, collect the voltage observation value and current observation value output by the photovoltaic power generation system. Specifically, the current observation value of the photovoltaic panel can be collected through the current sampling circuit or current sensor, and the photovoltaic panel can be collected through the voltage sampling circuit or voltage sensor The voltage observation value;

[0038] S2. Establish a disturbance observer according to various uncertain factors such as nonlinearity, parameter uncertainty and random shading environment when the photovoltaic power generation...

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Abstract

The invention provides a maximum power tracing method and system of a photovoltaic system. A disturbance observer can be built according to various uncertainty factors such as non-linearity, parameteruncertainty and random shadow environment during working of a photovoltaic power generation system, a voltage disturbance estimation value and a current disturbance estimation value are obtained after a voltage observation value and a current observation value are input the disturbance observer, a sliding plane is calculated according to the voltage disturbance estimation value and the current disturbance estimation value, an actual control voltage and a control current are obtained by sliding-mode control on the two disturbance estimation value, and maximum power point tracing of photovoltaic power generation is finally achieved. Maximum power tracing of the photovoltaic system under a local shadow environment is achieved, and the maximum power point capturing capability of the photovoltaic system and the system control robustness are improved.

Description

technical field [0001] The invention relates to the technical field of power control systems, in particular to a maximum power tracking method and system for a photovoltaic system. Background technique [0002] Solar energy has been developed and applied on a large scale around the world due to its clean and efficient characteristics. Photovoltaic power generation system is a form of solar energy utilization, and photovoltaic power generation system is an energy conversion form that converts solar energy into electrical energy. However, the power output of a photovoltaic system not only depends on its own electrical characteristics, but also has a great relationship with environmental factors, such as the installation environment of photovoltaic panels and the surface temperature of photovoltaic arrays. The parameters make the photovoltaic power generation system run near the maximum power point, and try to improve the power generation efficiency of the photovoltaic system. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 林桃贝庞松岭马立红
Owner HAINAN POWER GRID CO LTD ELECTRIC POWER RES INST
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