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Control method for maximum power point tracking (MPPT) of photovoltaic array

A technology of maximum power point and photovoltaic array, applied in photovoltaic power generation, control/regulation systems, instruments, etc., can solve problems such as power loss and grid impact, and achieve the effect of avoiding power fluctuations, avoiding power loss, and good application prospects

Active Publication Date: 2014-12-03
ZHEJIANG UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

Although the above global scanning method can find the true maximum power point, it will inevitably cause unnecessary long-term large fluctuations in the output power of the photovoltaic array, resulting in additional power loss and impact on the grid

Method used

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  • Control method for maximum power point tracking (MPPT) of photovoltaic array
  • Control method for maximum power point tracking (MPPT) of photovoltaic array
  • Control method for maximum power point tracking (MPPT) of photovoltaic array

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto. The control flow chart of MPPT among the embodiment is attached figure 1 shown, including the following steps:

[0021] 1) When the photovoltaic power generation system MPPT control starts, set the corresponding open circuit voltage of the photovoltaic array at the current temperature (U oc ), short circuit current (I sc ), iteration step size (U Step ), judgment threshold (ε s , ε U and ε I ), initial voltage (U 0 ), the parameters in the traditional single-peak MPPT method, so that the sampling point count k is 1.

[0022] 2) Measure and record the initial moment (t 1 Time) The terminal voltage U of the photovoltaic array k and output current I k (k=1).

[0023] 3) Calculate the current operating point (U k , I k ) and the reciprocal of the slope of the line...

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Abstract

The invention discloses a control method for the maximum power point tracking (MPPT) of a photovoltaic power system. For the control method, on the basis of the traditional MPPT method, a judgement basis for the output characteristic change of the photovoltaic array is added, and a control strategy for the MPPT after the output characteristic change is improved. When the output characteristics of the photovoltaic array are remarkably changed due to a shadow or an assembly fault and the like, an operation point (U, I) on the I-U output characteristic curve of the photovoltaic array is rapidly adjusted to a straight line for connecting the origin of coordinates with a point (Uoc, Isc), and then tracking is performed to the maximum power point of the photovoltaic array starting from the operation point by using the traditional MPPT method. With the adoption of the control method for the MPPT of the photovoltaic power system disclosed by the invention, tracking can be rapidly and accurately performed to a global maximum power point on a multimodal output P-U characteristic curve of the photovoltaic array, and the fluctuation on the output power of the photovoltaic array due to the MPPT method during the tracking process is slight, so that the control method for the MPPT of the photovoltaic power system is good in application prospect.

Description

technical field [0001] The invention relates to a photovoltaic array maximum power point tracking control method under partial shadow conditions, and belongs to the maximum power point tracking method of a photovoltaic power generation system. Background technique [0002] With the depletion of traditional energy and the awakening of environmental awareness, the development and utilization of solar energy has been paid more and more attention. Photovoltaic power generation is the main way to utilize solar energy. In a large-capacity photovoltaic power generation system, it is usually necessary to connect a certain number of photovoltaic modules in series and parallel to form a photovoltaic array. In order to prevent the negative impact of module product failure or partial shadowing, the photovoltaic array is also equipped with bypass diodes and anti-reverse diodes. . The output power of photovoltaic modules is closely related to solar irradiance and module temperature. Unde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCY02E10/58Y02E10/56
Inventor 戚军
Owner ZHEJIANG UNIV OF TECH
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