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Tracker for maximum power of light-volt electric-power production by solar energy, and control method

A maximum power tracking, solar photovoltaic technology, applied in the direction of optical radiation generators, control/regulation systems, generators/motors, etc., can solve the problems of mismatched photovoltaic arrays, no devices, and the output of photovoltaic arrays is not at the maximum power point. , to achieve the effect of reducing control difficulty, improving quality, stability and reliability

Inactive Publication Date: 2006-07-05
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0004] (1) The usual maximum power tracker is designed for a specific system, an independent system or a grid-connected system, and does not form a separate device
[0005] (2) The maximum power tracker uses a single-branch structure. When the required power is large, multiple photovoltaic arrays are directly connected to the DC input in parallel. Due to the differences in the characteristics and light-receiving conditions of each photovoltaic array, the photovoltaic array There is also a difference in the maximum power point of the photovoltaic array. If they are directly connected in parallel, there will be a mismatch between the photovoltaic arrays. There are many ways and algorithms, and there are big differences in various ways and algorithms, and there are obvious shortcomings

Method used

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  • Tracker for maximum power of light-volt electric-power production by solar energy, and control method
  • Tracker for maximum power of light-volt electric-power production by solar energy, and control method
  • Tracker for maximum power of light-volt electric-power production by solar energy, and control method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] figure 1 It is the equivalent circuit diagram of a single solar cell. As shown in the figure, an ideal solar cell, r s small and r sh are so large that they can be ignored in general analysis. At this time, the current I flowing through the load L =I SC -I 0 (e qv / AKT -1). In the formula, I 0 is the saturation current of the solar cell when there is no light, q is the electron charge, K is the Boltzmann constant, A is the diode curve factor, I SC is the short circuit current. A single solar cell can only produce a voltage of about 0.45V, which is far below the value required for practical applications. In engineering applications, solar cells must be connected into modules. A solar cell module contains a certain number of solar cells connected by wires. On a module, the standard number of solar cells is 36 or 40, and the ope...

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Abstract

Characters of the invention are that first, microprocessor obtains information of voltage and current of light-volt array; using algorithm for tracking maximum power in order to determine operating point of light-volt array at next moment; through A / D convertor, the information is converted to reference point Vref. After proportional integral PI adjusts difference value between Vref and sampled actual voltage of light-volt array, PWM control chip generates PWM wave with certain duty ratio to control DC-DC convertor. The method can implement coordinational operation of two branches and multiple branches in plug and play mode. Voltage control mode insensitive to maximum power point is adopted in the invention. Tracking effect is raised by method maximum power point instead of method of current tracking. Being in use for power supply for multiple DC loads, the system is applicable to independent light-volt system as well as to networked light-volt system.

Description

technical field [0001] The invention relates to a solar photovoltaic power generation system, in particular to a tracker and a control method for an independent grid-connected solar photovoltaic power generation system with maximum power tracking. Background technique [0002] With the development of solar photovoltaic power generation, the use of independent operation and grid-connected solar photovoltaic power generation systems has played an important role in solving electricity consumption in remote areas without electricity and relieving energy supply tension in cities. Grid-connected photovoltaic systems are becoming a worldwide Research hotspots. Whether it is an independent operation system or a grid-connected photovoltaic power generation system, how to use the limited space and area to improve the efficiency of the system and obtain the maximum energy is even more important, especially the high price and low efficiency of solar photovoltaic cells. The main reasons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02M3/28H02N6/00G05F1/67
Inventor 陈兴峰许洪华武鑫赵斌曹志峰
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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