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Stepwise progressive variable-step MPPT (maximum power point tracking) system and method

A gradual and variable step size technology, applied in the field of solar photovoltaic power generation, can solve the problems of oscillation and inability to judge when the maximum power point is reached, and achieve the effect of eliminating misjudgment, improving oscillation phenomenon, and low hardware requirements

Inactive Publication Date: 2018-09-04
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

The advantage of the perturbation and observation method is that the structure is simple and easy to implement, but its disadvantage is that it cannot judge when the maximum power point is reached, and there is oscillation

Method used

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  • Stepwise progressive variable-step MPPT (maximum power point tracking) system and method

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Embodiment Construction

[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0042] Such as figure 1 As shown, a step-by-step variable step size MPPT system structure includes a current sensor, a voltage sensor, a CPU module, a flyback DC-DC conversion circuit module, a full-bridge DC-AC conversion circuit module, an EMI filter circuit module, a sampling Circuit module, auxiliary power supply circuit module. The current sensor is used to collect the current of the photovoltaic module; the voltage sensor is used to collect the voltage of the photovoltaic module. The CPU module is composed of a dsPIC single-chip microcomputer, and includes two pulse width modulation modules...

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Abstract

The invention discloses a stepwise progressive variable-step MPPT (maximum power point tracking) method. Two variable steps different in size are utilized according to changes in voltage and power; whether to use the first step or the second step is judged according to a working point being on the left or the right of a maximum power point, so that tracking speed increases with the working point approaching the maximum power point; both the first step and the second step gradually decrease with n value ratio, thereby improving oscillation near the maximum power point and improving steady stateprecision. The invention also provides a stepwise progressive variable-step MPPT system, comprising a photovoltaic module, a CPU (central processing unit) module, a flyback DC-DC conversion circuit module, a full-bridge DC-AC conversion circuit module, an EMI (electromagnetic interference) filter circuit module, an auxiliary power circuit module, and a sampling circuit module. The system and method can provide maximum power point tracking, and provide good steady-state and dynamic performances for a photovoltaic module upon severe changes in external environment.

Description

technical field [0001] The invention relates to the field of solar photovoltaic power generation, in particular to a step-by-step MPPT system and method with variable step length. Background technique [0002] In the context of the increasingly serious global energy crisis, solar energy, as a new energy source, has successfully become a new type of renewable green energy with the most development potential due to its advantages of abundant reserves, economy, cleanliness and pollution-free. Photovoltaic array is an important part of photovoltaic power generation system. Its output power has a nonlinear relationship with ambient temperature and light intensity. The output power is one of the important factors restricting the development of photovoltaic power generation system. In order to increase the output power, the maximum power point tracking (MPPT) technology is required in the actual control circuit. Through the maximum power point tracking (MPPT) technology, the power ...

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 李自成刘星雨王后能曾丽文小玲刘健熊涛
Owner WUHAN INSTITUTE OF TECHNOLOGY
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