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A variable step size mppt control method

A control method and variable step size technology, applied in control/regulation systems, regulation of electrical variables, photovoltaic power generation, etc., can solve the problem of affecting the maximum power point tracking control effect, inability to take into account rapidity and stability, design difficulty and high cost, etc. problem, to achieve the effect of simple design, improved tracking ability, and solving misjudgment problems

Inactive Publication Date: 2018-02-27
JIANGSU UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fixed step size affects the control effect of maximum power point tracking, and it cannot take into account the speed and stability
The existing variable step size control method improves the fast tracking ability and steady-state effect of the system, but the design difficulty and cost are high, and the versatility is poor

Method used

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  • A variable step size mppt control method
  • A variable step size mppt control method
  • A variable step size mppt control method

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Embodiment Construction

[0026] The present invention will be further explained below according to the drawings and specific embodiments of the specification. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0027] The present invention establishes a photovoltaic cell model and a boost circuit model, collects the output voltage and output current value of the photovoltaic cell, and determines whether the parameter H is greater than 0 to select a suitable step size scheme. When H>0, use a large step size conductance increase Quantitative method to search for the maximum power point. When H≤0, use the small-step conductance incremental method to track, so that the working point can quickly and stably approach the maximum power point, and use the power change to determine whether the external environment has a sudden change. Given H Assignment to choose an appropriate ...

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Abstract

The invention discloses a variable-step length MPPT (Maximum Power Point Tracking) control method which comprises the following steps: establishing a photovoltaic cell model and a booster circuit model, establishing the booster circuit model based on the photovoltaic cell model to realize maximum power point tracking; obtaining the output voltage and the current value of a photovoltaic cell, calculating delta Uk, delta Ik, delta Uk+1, delta Ik+1 and delta P; calculating and judging whether a parameter H is more than 0 or not; if H is more than 0, searching a maximum power point by using a large-step length conductance increment method; if H is less than or equal to 0, decreasing the tracking step length of a system, so that the system is quickly contracted to the vicinity of the maximum power point; if the power inside the system slightly changes as the external environment does not obviously change, outputting H=-1; if the delta P is larger and exceeds a preset limit value lim delta P as the external environment suddenly changes and is larger in change, outputting H=1. According to the method disclosed by the invention, when the system is far away from the maximum power point, the large-step length conductance increment method is adopted, so that the traceability is improved; after the system is close to the maximum power point, a small-step length tracking scheme is switched, so that the average output power of a photovoltaic module is improved.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a variable step size MPPT control method. Background technique [0002] As an inexhaustible renewable energy source, solar energy has been highly valued in the world today. However, the power output of solar cells is non-linear, and environmental changes have a great impact on its electrical energy output. Maximum Power Point Tracking technology (Maximum Power Point Tracking) can effectively solve the problems of low efficiency and high cost in traditional photovoltaic power generation systems, and give full play to the effectiveness of photovoltaic modules. [0003] Common MPPT control methods include constant voltage method (CTV), perturbation and observation method (P&O), incremental conductance method (INC), etc. The fixed voltage method has a simple algorithm and high stability, but the system tracking accuracy is poor. The perturbation a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 顾石磊孙玉坤张亮黄永红
Owner JIANGSU UNIV
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