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Power tracking method

A power and power value technology, applied in the field of photovoltaic power generation, can solve the problems of global optimization failure, high hardware investment cost, and complicated implementation of maximum power point tracking scheme

Inactive Publication Date: 2018-07-20
SHENZHEN SOFAR SOLAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the technical defects in the prior art, the implementation of the maximum power point tracking scheme for photovoltaic modules is complicated, the hardware investment cost is high, the global optimization fails, and it cannot be practically applied, the present invention proposes a power tracking method. include:

Method used

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Embodiment 1

[0037] Such as figure 1 Shown is a flow chart of the first embodiment of the power tracking method of the present invention, the method includes:

[0038] S1. Increase or decrease the input voltage value of the photovoltaic module at the preset detection frequency within the preset detection time;

[0039] S2. During the process of increasing the voltage reference value, record the input voltage value, input current value and power value according to the detection frequency;

[0040] S3. Determine the global maximum power point of the photovoltaic module according to the power value;

[0041] S4. Draw a current-voltage curve and a power-voltage curve according to the recorded voltage value, input current value, and power value;

[0042] S5. Combining the current-voltage curve and the power-voltage curve, determine the number of peaks of the photovoltaic module;

[0043] S6. Judging the shadow shielding state of the photovoltaic module according to the number of peaks, and d...

Embodiment 2

[0058] Figure 6 It is a waveform diagram of the scanning shadow state in the second embodiment of the power tracking method of the present invention. Based on the above embodiments, in this embodiment, the implementation method of power tracking will be introduced in detail.

[0059] First, set the shadow scan function as an optional function on the function software. This function can be enabled or disabled through the LCD display. At the same time, the scanning frequency can also be set through the LCD display. The optional scanning range is 1 -60 minutes, this program is preferably 30 minutes.

[0060] Then, perform the following processing operations:

[0061] 1. The photovoltaic module is powered on for detection, specifically, when the photovoltaic module is powered on and detected, the first reference point is determined through maximum power point tracking, such as Figure 6 Point A shown.

[0062] 2. According to the above operation, after the first reference poin...

Embodiment 3

[0087] Firstly, a current-voltage curve and a power-voltage curve are drawn according to the recorded voltage value, input current value and power value.

[0088] Then, combine the current-voltage curve and the power-voltage curve to determine the number of peaks of the photovoltaic module; finally, combine the method steps of the first embodiment and the second embodiment above, judge the shadow of the photovoltaic module according to the number of peaks shading state, and determine the global maximum power point of the photovoltaic module.

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Abstract

The invention discloses a power tracking method. The method comprises the steps of increasing or decreasing an input voltage value of a photovoltaic assembly according to a preset detection frequencywithin a preset detection time; during increase of a voltage reference value, according to the detection frequency, recording the input voltage value, an input current value and a power value; determining a global maximum power point of the photovoltaic assembly according to the power value; drawing a current-voltage curve and a power-voltage curve according to the recorded voltage value, the recorded input current value and the recorded power value; combining the current-voltage curve with the power-voltage curve, and determining the number of peaks of the photovoltaic assembly; determining ashadow occlusion state of the photovoltaic assembly according to the number of the peaks. An efficient global maximum power point tracking scheme is achieved. According to the scheme, the scanning speed is high, a scanning result is accurate and easy to implement, and there is no need to add hardware equipment. By adopting the scheme, the utilization rate of the photovoltaic assembly is increased, and the system power generation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a power tracking method. Background technique [0002] With the increasingly prominent energy and environmental issues, solar photovoltaic power generation has attracted much attention due to its advantages of no pollution, abundant reserves and wide distribution. Photovoltaic power generation faces two main problems: first, the efficiency of photovoltaic power generation is low when the light intensity is low, and second, the I-V characteristic curve is nonlinear due to the influence of temperature and light intensity. The low efficiency and high capital investment of photovoltaic power generation make it an indispensable part of the photovoltaic power generation system to adopt MPPT (Maximum Power Point Trackin) control to obtain the maximum energy output in real time. When the temperature is constant and the light intensity is uniformly distributed, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 易德刚彭益媛肖荣
Owner SHENZHEN SOFAR SOLAR
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