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Membrane-calculating based photovoltaic maximum power tracking method and device

A technology of maximum power tracking and photovoltaic power generation, applied in the field of solar photovoltaic power generation, can solve the problems of low precision, strong oscillation, and time-consuming, etc., achieve fast and reliable tracking, reduce the possibility of tracking to local peaks, and improve global search performance Effect

Inactive Publication Date: 2014-09-10
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

The artificial neural network method does not require specific PV cell parameters to get a good solution, but it takes a lot of time for data collection and training
The fuzzy logic method is more stable when the precise mathematical model is lacking, but it suffers from low accuracy and strong oscillations

Method used

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  • Membrane-calculating based photovoltaic maximum power tracking method and device
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  • Membrane-calculating based photovoltaic maximum power tracking method and device

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Embodiment 1

[0050] Such as figure 1 As shown, a method for tracking the maximum power of photovoltaic power generation based on film calculation includes the following steps:

[0051] Step 1: Initialize the predetermined number of film calculation units, the predetermined number of photovoltaic array output voltages calculated by each film calculation unit, and the particle swarm search strategy parameters;

[0052] Step 2: Collect temperature data and light intensity data on the surface of the photovoltaic array at multiple consecutive times;

[0053] Step 3: Create several membrane calculation units according to the predetermined number of membrane calculation units;

[0054] Step 4: Input the particle swarm search strategy parameters, temperature data at multiple moments, and light intensity data at multiple moments into all film calculation units. Each film calculation unit calculates a predetermined number of photovoltaics at multiple times. Array output voltage, select the largest photovol...

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Abstract

The invention relates to a membrane-calculating based photovoltaic maximum power tracking method and device. The membrane-calculating based photovoltaic maximum power tracking method includes the steps of initializing the predetermined number of membrane computing units, the predetermined number of photovoltaic array output voltage calculated to acquire by each membrane-calculating unit and search strategy parameters of a particle swarm; collecting temperature data and light intensity data of surfaces of photovoltaic arrays of multiple continuous time; establishing a plurality of membrane calculating units according to the predetermined number of the membrane calculating units; calculating to acquire the photovoltaic array output voltage with the predetermined number and multiple moments through the membrane-calculating units, and selecting the maximum photovoltaic array output voltage of each moment; calculating to acquire duty ratio of a PWM (pulse-width modulation) module according to the photovoltaic array output voltage of the current moment and the photovoltaic array output voltage of the last moment, and regulating the photovoltaic array output voltage according to values of the duty ratio and by the aid of a chopper circuit. On the basis of a membrane-calculating model framework, global searching performance of the maximum power tracking method is improved, and the maximum power point can be rapidly and reliably tracked.

Description

Technical field [0001] The invention relates to the field of solar photovoltaic power generation, in particular to a method and device for tracking the maximum power of photovoltaic power generation based on film calculation. Background technique [0002] Improving the efficiency of solar photovoltaic power generation systems is one of the hot issues currently studied. One of the effective methods is to track the maximum power point of the photovoltaic power generation system in real time. Because the power output characteristics (P-V curve) of photovoltaic cells are nonlinear, and this nonlinearity is affected by factors such as light intensity, battery surface temperature, load, etc., it is very difficult to track the maximum power point in real time. Especially when the photovoltaic power generation system is partially shaded, the P-V curve will produce complex multi-peak conditions. These multiple peaks usually greatly reduce the efficiency of the maximum power tracking alg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCY02E10/58Y02E10/56
Inventor 潘林强贺娟娟
Owner HUAZHONG UNIV OF SCI & TECH
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