Maximum power point tracking method for dP/dV I near-linear photovoltaic generating system

A photovoltaic power generation system and maximum power point technology, applied in photovoltaic power generation, current collectors, electric vehicles, etc., can solve problems such as power fluctuations, complexity, rapidity, and losses

Inactive Publication Date: 2006-11-15
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the relationship between photovoltaic array dP/dV and V is nonlinear, such as Figure 4 shown
Therefore, various maximum power tracking control conversion methods based on the re

Method used

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  • Maximum power point tracking method for dP/dV I near-linear photovoltaic generating system
  • Maximum power point tracking method for dP/dV I near-linear photovoltaic generating system

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Embodiment Construction

[0051] The maximum power point tracking technology described in the present invention can be applied to both an independent photovoltaic power generation system and a grid-connected photovoltaic power generation system. Taking an independent photovoltaic power generation system as an example, as Figure 10 Shown:

[0052] 1) Solar cells: Solar cells are the input of an independent photovoltaic power generation system, providing power for the entire system including the control circuit. Under daylight conditions, the solar cell converts the received light energy into electrical energy, and charges the battery through the charging circuit; after dark, the solar cell stops working and the output terminal is open.

[0053] 2) Battery: As the energy storage link of an independent photovoltaic power generation system, the battery converts the electrical energy output by the solar cell into chemical energy and stores it during the day, and then converts it back into electrical energy...

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Abstract

The invention belongs to the light volt generating system controlling technology domain, the independent light volt generating system based on the maximal power point tracing technology includes: (1)the solar cell; (2)the storage cell; (3)BUCK circuit; (4)the light voltage combining net system. Because of the light volt cell array having the dP/Dv and I almost linear characteristic connection when working in the maximal power working point and the stable working zone. The invention is aiming at the adopt the light volt array output circuit, the MPPT controlling of the light volt array can be realized by controlling BUCK circuit accounting empty percent as the power switching tache or the PWM driving signal of the combining net system reverse changing machine. When the light intension has the quick change, the light volt array output circuit can trace the change with the lineal, the quick and the smooth mode, the light volt cell array maximal power point trace controlling can be realized better.

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 can provide continuous power output without being connected to the grid, so it has been gradually applied in remote areas without electricity; the grid-connected photovoltaic power generation system can be equipped with or without energy storage link. The output end is connected to the mains and outputs electric energy to the grid, just like a small distributed power station, the traditional control method is more complicated, usually requires a double-loop control circuit, the inner loop is a current loop to realize the output current of the grid-connected photovoltaic inverter It is output synchronously w...

Claims

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Application Information

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IPC IPC(8): H02J7/35
CPCY02E10/56
Inventor 周德佳赵争鸣吴理博
Owner TSINGHUA UNIV
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