Photovoltaic power generation maximum power tracking method capable of correcting open-circuit voltage online

A technology of maximum power tracking and open circuit voltage, applied in photovoltaic power generation, adjusting electrical variables, instruments, etc., can solve problems such as high cost, system operation interference, and inability to fully realize optimal control, so as to improve efficiency and dynamic response speed and the effect on steady-state performance

Active Publication Date: 2017-05-31
NORTHEAST DIANLI UNIVERSITY +3
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Problems solved by technology

However, due to the relatively high cost of photovoltaic cells and the low conversion efficiency, the output power changes with changes in light intensity, ambient temperature and load. The efficiency of power generation system to reduce power loss has important research significance
[0003] In the traditional open circui

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  • Photovoltaic power generation maximum power tracking method capable of correcting open-circuit voltage online
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  • Photovoltaic power generation maximum power tracking method capable of correcting open-circuit voltage online

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Embodiment Construction

[0046] The method for tracking the maximum power of photovoltaic power generation with on-line correction of the open-circuit voltage of the present invention will be further described below using the drawings and embodiments.

[0047] A photovoltaic power generation maximum power tracking method for online correction of open circuit voltage of the present invention comprises the following content:

[0048] 1) Establishment of photovoltaic cell model with given temperature and irradiance

[0049] Based on the external characteristics of the photovoltaic cell, the open circuit voltage V of the photovoltaic cell in the standard environment is adjusted according to the environmental change oc , maximum power point voltage V m and current I m Make corrections to fit the output characteristics in different environments, expressed by formula (1):

[0050]

[0051] Among them, I L is the current of the photovoltaic cell (A); I sc is the short-circuit current (A) of the photov...

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Abstract

The invention discloses a photovoltaic power generation maximum power tracking method capable of correcting open-circuit voltage online in order to solve the problem that when outside environment temperature greatly changes, a photovoltaic array cannot quickly track the maximum power point. The method is characterized by including the steps of building a model of a given temperature and an irradiance photovoltaic cell, building a model of different temperatures and the irradiance photovoltaic cell, improving the maximum power tracking control strategy of the open-circuit voltage, a grid-connected inverter control strategy and other contents, and building a photovoltaic power generation system including a photovoltaic cell model, a boost chopper circuit and a grid-connected inverter through PSCAD/EMTDC simulation software; the open-circuit voltage is updated according to outside environment changes, so that the photovoltaic system is stabilized at the maximum power point quickly; the incremental conductance method is introduced to improve the steady-state performance at the maximum power point so as to further improve energy conversion efficiency of the photovoltaic power generation system; an effective means is provided for improving the maximum power point tracking efficiency of the photovoltaic array and reducing energy loss of the photovoltaic array.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, and relates to a maximum power tracking method of photovoltaic power generation for online correction of open circuit voltage. Background technique [0002] my country is rich in solar energy resources, and vigorously developing solar power generation is an effective way to increase my country's energy supply, adjust energy structure, achieve sustainable energy development and protect the environment. However, due to the relatively high cost of photovoltaic cells and the low conversion efficiency, the output power changes with changes in light intensity, ambient temperature and load. The efficiency of power generation system to reduce power loss has important research significance. [0003] In the traditional open-circuit voltage method, updating the open-circuit voltage will interrupt the normal operation of the system, which will interfere with the operation of the system...

Claims

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Application Information

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IPC IPC(8): G05F1/67
CPCG05F1/67Y02B10/10Y02E10/56
Inventor 李翠萍张佳星李军徽李华康士祥
Owner NORTHEAST DIANLI UNIVERSITY
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