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Adaptive variable-step MPPT (maximum power point tracking) control method for coping with quick change of illumination intensity

A technology of light intensity and control method, applied in the control/regulation system, photovoltaic power generation, regulating electrical variables, etc., can solve problems such as output power oscillation, and achieve the effect of avoiding power fluctuations

Active Publication Date: 2014-01-01
XUJI GRP +1
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  • Abstract
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Problems solved by technology

[0011] The purpose of the present invention is to provide an adaptive variable step size MPPT control method for rapid changes in light intensity, to solve the problem of output power oscillation caused by existing control methods

Method used

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  • Adaptive variable-step MPPT (maximum power point tracking) control method for coping with quick change of illumination intensity
  • Adaptive variable-step MPPT (maximum power point tracking) control method for coping with quick change of illumination intensity
  • Adaptive variable-step MPPT (maximum power point tracking) control method for coping with quick change of illumination intensity

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] Such as image 3 It is a flow chart of the step size adjustment program of an embodiment of the present invention.

[0043] Detect the output voltage U(k) and current I(k) of the DC part of the photovoltaic grid-connected inverter; (here k is the sampling number, which is different from the first to seventh thresholds k1...k7 below)

[0044] Calculation: Power P(k)=U(k)*I(k) and various differences: dU=U(k)-U(k-1); dI=I(k)-I(k-1) ;dP=P(k)-P(k-1);

[0045] Judging whether the first criterion is established, the first criterion is (|dU|<=k1)&&(|dP|<=k2)&&(|dI|<=k3), the first criterion should at least include the voltage difference Value and current difference judgment, power difference judgment makes the judgment more accurate, the second criterion below is similar. The reason why the difference is directly compared instead of dP / dU is that the stab...

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Abstract

The invention relates to an adaptive variable-step MPPT (maximum power point tracking) control method for coping with quick change of illumination intensity. Based on a perturbation and observation method, sampled direct-current voltage and direct current are detected and judged without adding any hardware detection devices by the aid of an existing hardware structure of a photovoltaic grid-connected inverter, large-step perturbation, small-step perturbation and zero-step perturbation (constant-voltage method) are correspondingly selected, so that tracking speed, steady accuracy and tracking efficiency simultaneously meet requirements, the shortcomings of an existing MPPT method are overcome, and energy loss caused by power fluctuation and low tracking efficiency is avoided.

Description

technical field [0001] The invention relates to an adaptive variable step size MPPT control method. Background technique [0002] At present, the maximum power tracking scheme of photovoltaic grid-connected inverters generally adopts the power disturbance observation method with a fixed step size. The more times the power point needs to be perturbed, the longer the tracking time is. On the contrary, when the step length is longer, the tracking speed is faster, but the fluctuation range is larger near the maximum power point. Long tracking time and large fluctuations near the maximum power point lead to serious energy loss and reduce tracking efficiency. Therefore, when using this method, it is difficult to ensure the tracking speed, steady-state accuracy and tracking efficiency of the maximum power point of the photovoltaic system at the same time; Perturbation and observation method with adaptive variable step size. The flow chart of the commonly used MPPT tracking metho...

Claims

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Application Information

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IPC IPC(8): G05F1/67
CPCY02E10/58Y02E10/56
Inventor 姚为正曹建博张海龙刘刚王林黄辉
Owner XUJI GRP
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