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Sensor-free type maximum power tracking control method

A technology of maximum power tracking and control methods, which is applied in control/regulation systems, instruments, photovoltaic power generation, etc., can solve problems such as high manufacturing costs, MPPT control failure, and complex control circuit structure, and achieve simple control circuits and safe system operations , Overcome the effect of easy tracking failure

Inactive Publication Date: 2014-03-19
宋会涛 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a control circuit structure is relatively complicated, and the manufacturing cost is relatively high.
Moreover, MPPT control may fail under complex lighting conditions

Method used

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  • Sensor-free type maximum power tracking control method
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  • Sensor-free type maximum power tracking control method

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Embodiment Construction

[0017] Further description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0018] Such as figure 1 with figure 2 As shown, for an independent photovoltaic system with constant load, when the effective power P PV At the maximum, the output power P at the output of the inverter Load and output current I Load is the maximum; for the grid-connected photovoltaic system, the grid voltage is constant, when P PV At maximum, at the inverter output P Load and I Load Also the largest. Therefore, the present invention indirectly controls the output power of the photovoltaic array by directly controlling the output current of the inverter. MPPT control can also be achieved without sensors at the output of the photovoltaic array. Only need to consider the converter output current I Load One factor saves the link that the traditional MPPT method needs to use sensors to detect the output current and output voltage of the photovoltaic arr...

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Abstract

The invention discloses a sensor-free type maximum power tracking control method specific to a photovoltaic generating system. A maximum power point (MPP) is tracked through comparing a load current and an output current, thus, the link for detecting the output current and the output voltage of a photovoltaic array as feedback signals by using a sensor in the traditional MPPT (Maximum Power Point Tracking) method is omitted to ensure that a control circuit is simpler, and simultaneously, the manufacturing cost is reduced. In a high-power photovoltaic generating system, the method ensures that the system operation is safer and more reliable and efficient due to no need of a sensor with heavy current and high voltage. In addition, the defect that the traditional MPPT method is easy to cause tracking failure is overcome.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation, in particular to a method for maximum power tracking control of a photovoltaic power generation system. Background technique [0002] As a non-polluting, renewable new energy source, solar energy has a very broad development prospect and has been widely used in our country. my country is a country rich in solar energy resources. In coastal islands, mountainous areas with inconvenient transportation, sparsely populated grasslands and pastures, and rural areas 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 to production and life. A reliable way of energy can achieve good economic and social benefits. [0003] In a photovoltaic power generation system, it is usually required to be able to extract the maximum power converted by the photovoltaic cell at any moment, that is, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67G05F3/08
CPCY02E10/58Y02E10/56
Inventor 崔佩聚陈晓高
Owner 宋会涛