Method for tracing maximum power point of solar photovoltaic battery
A technology of maximum power point and photovoltaic cells, which is applied in photovoltaic power generation, light radiation generators, and regulation of electrical variables, can solve the problems of high manufacturing cost, complex hardware structure, and poor reliability, and achieve low cost, simplified hardware structure, Effect of improving conversion efficiency
Inactive Publication Date: 2008-04-02
CHINA AGRI UNIV
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[0008] The perturbation and observation method has an accurate algorithm and high control precision. At the same time, it may also only track the "local optimum", and the corresponding hardware structure is complex, the manufacturing cost is high, and the reliability is poor.
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[0027] Fig. 5 is a chart showing the given voltage calculation of the solar photovoltaic cell maximum power point tracking method of the present invention.
[0028] A solar photovoltaic cell maximum power point tracking method, comprising the following steps:
[0029] (1) Calculate the given voltage Usp' of the solar photovoltaic cell under different sunlight intensities and store it in the controller, specifically comprising the following steps;
[0030] ①According to the rated data of solar photovoltaic cells, the maximum open circuit voltage U0m and the nominal peak wattage value Wp, determine a maximum power point A, and the coordinates of point A in the volt-ampere characteristic curve table of solar photovoltaic cells are (k*U0m, Wp / kU0m), where 0.75≤k≤0.85, the specific value is determined by the material and control strategy of the photovoltaic cell;
[0031] ②Measure a short-circuit current Ik and its open-circuit voltage Uok when the output current of the solar pho...
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The present invention discloses a tracing method of maximum power points of solar photovoltaic cells and belongs to the solar photovoltaic cell field. The steps of the present invention includes: (1) given voltages of solar photovoltaic cell under different intensities of sunlight are calculated and stored in a control chip; (2) the value of intensity of sunlight is read, and the given voltage of the solar photovoltaic cell under the intensity of sunlight is read according to the value of the intensity of sunlight; (3) an actual output voltage of the solar photovoltaic cell is read; a difference value between the value and the given voltage in th estp (2) is regulated with a PI regulating method; a PMW pulse is obtained by comparing the regulating result and triangular waves to drive power devices and regulate the load impedance of the solar photovoltaic cell. The control algorithm of the present invention is very simple and reliable by tracing the maximum power point of solar photovoltaic cells with a rectilinear of a specific slope, and the present invention has a strong anti-interference ability, simplifies the hardware structure of the control, reduces the cost, improves the control precision of the system effectively and improves conversion efficiency of photovoltaic generation systems.
Description
technical field [0001] The invention belongs to the field of solar photovoltaic cells, in particular to a method for tracking the maximum power point of a solar photovoltaic cell. Background technique [0002] As a non-polluting, renewable new energy source, solar energy has very broad development prospects and has been widely used at home and abroad. [0003] my country is a country rich in solar energy resources. In coastal islands, remote mountainous areas with inconvenient transportation, grasslands and pastures with vast land and sparsely populated areas, as well as rural areas, frontiers and minority areas that are far away from the power grid and difficult to reach the power grid in the near future, solar power generation has become a solution. A reliable way to produce and live energy can achieve good economic and social benefits. According to statistics, the potential solar energy resources in the world reach 120,000Tw, and 600Tw can actually be exploited. This is t...
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Login to View More IPC IPC(8): G05F1/67H02N6/00
CPCY02E10/58Y02E10/56
Inventor 翟庆志杨明皓
Owner CHINA AGRI UNIV