Maximum power point tracking system for the solar-supercapacitor power device and method using same

a supercapacitor and power point technology, applied in the direction of lighting and heating equipment, process and machine control, instruments, etc., can solve the problems of insufficient solar energy, insufficient solar energy nevertheless not a perfect renewable energy, and the density of the supercapacitor, etc., to achieve fast response and low internal resistance

Inactive Publication Date: 2008-06-19
SUN MING HSIN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0013]The present invention provides a pulse-power supercapacitor electrically connected between a photovoltaic panel and a DC / DC converter. The supercapacitor with low internal resistance and fast response, servers as a steady-state input / output energy storing device. Accordingly, a novel, instant and efficient solar energy maximum power point tracking method is developed. Furthermore, an intelligent coordinating solar power system is designed based on this maximum power point tracking method.

Problems solved by technology

Such finite energy resources are not nearly enough for the endlessly developing human civilization in the future.
The solar energy is nevertheless not a perfect renewable energy.
In the past, the energy density of the supercapacitors is far below that of the battery, and thus is limited in the energy-storing applications.

Method used

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Embodiment Construction

[0022]Normally, the output power P of the photovoltaic panel is needed to be calculated in a perturbation and observation MPPT method. If the power is not at the maximum point, the duty ratio of the DC / DC converter is adjusted so as to change the resistance of the load and thus vary the output of the photovoltaic panel. The output power P of the solar power system is then be calculated again. The two calculated output powers are compared to obtain the power change situation, and then the duty ratio of the DC / DC converter is adjusted accordingly. The process steps are repeated to obtain the maximum power in an oscillatory way.

[0023]The primary process is shown in FIG. 5. The value of the power P is indicated by the voltage and the current of the circuit. Therefore, the values of the voltage V and the current I of the system must be detected to calculate the power P: P=I×V.

[0024]As shown in FIGS. 4-6, in the present invention, the current I is not necessary to be detected and only the...

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Abstract

A maximum power point tracking system, named flash supercapacitor-solar power device, and method for a solar power system, which mainly adds a pulse-power supercapacitor for being operated in a dynamic equilibrium are disclosed. The duty ratio D is changed and the voltage variance of the supercapacitor is observed to determine the next adjusting direction of the duty ratio D of the DC/DC converter. In the present invention, only a voltage value of the supercapacitor is needed to be monitored and no current-detection is needed. The output power of the solar power system can be actually estimated. The maximum power is traced in an oscillatory way. Therefore, the operation process of the perturbation and observation method, which is generally implemented currently, is simplified. By utilizing the steady-state equilibrium of the supercapacitor, only the voltage of the supercapacitor needs to be detected, and there is no need to measure and calculate the voltage and current values. The system is simple and easily accessible, which is a maximum power point tracking system and method with high efficiency for a solar power system.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a novel maximum power tracking point device and method for the solar power system, and more particularly to a system and method for utilizing solar energy to generate electricity.BACKGROUND OF THE INVENTION[0002]Due to the highly-developing industry and hurriedly-increased population, the energy resources on earth are consumed with unprecedented speed. It is expectable that some energy resources, which prop up human civilization in recent hundreds years, will be exhausted within the coming generations. The petroleum on earth may run out in 40-50 years, while the generation of natural gas can last only 60 years and the mineral resources of uranium can only support the use for about 70 years. Even for coal mine, which is estimated to last longer, the period should be no more than about 200 years. Such finite energy resources are not nearly enough for the endlessly developing human civilization in the future. Accordingly, the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F24J2/38F24S50/20
CPCG05F1/67
Inventor SUN, MING-HSIN
Owner SUN MING HSIN
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