Tracking method for maximum power point in photovoltaic grid-connected inverter

A technology of maximum power point and inverter, which is applied in photovoltaic power generation, instruments, and adjustment of electric variables, etc., can solve the problems of tracking speed and precision contradiction, achieve fast response speed, simple and effective precision and speed, and improve precision and speed Effect

Inactive Publication Date: 2014-01-01
WUHAN UNIV OF TECH
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is: to propose a maximum power point tracking method in a photovoltaic grid-connected inverter, which is based on the incremental conductance method

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[0053] The present invention will be further described below in conjunction with the embodiments and drawings.

[0054] The maximum power point tracking method in the photovoltaic grid-connected inverter provided by the present invention is specifically: assuming that the maximum power point voltage U of the solar panel set Is the open circuit voltage U oc About 78% of the voltage U set = 0.8U oc , Make the duty cycle of the converter linearly increase to close to the maximum power point; once the photovoltaic cell output voltage is lower than U set , The control program switches to the variable step-length conductance increment method.

[0055] See Figure 1-Figure 3 , The method includes the following steps:

[0056] Step 1: Use DSP (digital signal processor) as the maximum power point tracking controller of the photovoltaic system, sample the voltage U(k), and save the open circuit voltage U of the solar panel oc , Calculate U set = 0.8U oc ;

[0057] Step 2: After starting...

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Abstract

The invention relates to a tracking method for the maximum power point, applied in an independent photovoltaic grid-connected power generation system. According to the tracking method, the maximum power point of a solar cell panel is tracked in a variable step size mode on the basis of the conductance increment method, so that the problem that speed and accuracy are ambivalent in a traditional conductance increment method is solved. According to the tracking method, the step size of a work point can be achieved in an automatic regulating mode according to characteristics of the solar cell panel, and therefore when the work point is far away from the maximum power point, the step size is larger, and tracking speed is increased; when the work point is close to the maximum power point, the step size is reduced so that the oscillation phenomenon nearby the maximum power point can be reduced, and therefore efficiency is improved. The step size correcting MPPT algorithm provided by the tracking method can solve the conflicting problem, and accuracy and speed of MPPT can be improved easily and effectively. The tracking method has the advantages of being accurate in control and high in response speed, and can be suitable for rapid reaction occasions where sunshine and temperature change suddenly, and the situation of continuous changes of the sunshine can be stably tracked.

Description

technical field [0001] The invention relates to a maximum power point tracking method applied in an independent and grid-connected photovoltaic power generation system, and belongs to the technical field of photovoltaic power generation system control. Background technique [0002] The independent photovoltaic power generation system has its own energy storage link, which mainly solves the power supply problem in remote areas without electricity; the grid-connected photovoltaic power generation system is directly connected to the grid, like a small distributed power station, feeding the collected electric energy into the grid. [0003] Photovoltaic cells use the photoelectric effect to generate current, and the current-voltage curve of a solar panel is as follows figure 1 As shown, the power-voltage characteristic curve of the solar panel is as follows figure 2 As shown in the figure, it can be seen from the figure that in a certain environment, there is a maximum power po...

Claims

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Application Information

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IPC IPC(8): G05F1/67
CPCY02E10/58Y02E10/56
Inventor 刘教瑜曹能刘凯邓奕曹亚君余振洪熊晶晶杨乐
Owner WUHAN UNIV OF TECH
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