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Maximum power point tracking method for rapidly self-adapting step length of photovoltaic array

A technology of maximum power point and photovoltaic array, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of limiting tracking speed, etc., and achieve the effect of improving tracking speed and tracking accuracy, and adaptive step size v sensitivity

Inactive Publication Date: 2013-04-03
NINGBO UNIV
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Problems solved by technology

However, the adaptive step size v is greatly affected by the slope of the PV characteristic curve P-V curve. When the slope of the P-V curve is larger, the adaptive step size v is larger; when the slope of the P-V curve is smaller, the adaptive step size v is smaller, which means Limits its tracking speed

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  • Maximum power point tracking method for rapidly self-adapting step length of photovoltaic array
  • Maximum power point tracking method for rapidly self-adapting step length of photovoltaic array
  • Maximum power point tracking method for rapidly self-adapting step length of photovoltaic array

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] Such as figure 2 As shown, a maximum power point tracking method for fast self-adaptation of photovoltaic array step size, including the following steps:

[0038] ①The constant voltage method is adopted in the system start-up stage, so that the initial voltage V(0) is rapidly reduced to 80% of the open circuit voltage Vr, that is, V(0)=Vr*80%, and at the same time according to the initial voltage V(0)=Vr*80% , to sample the initial current I(0). For example, using a typical solar panel Solarex MSX60, the open circuit voltage Vr=21.000V; then, the initial voltage V(0)=Vr*80%=16.800V, and the initial current I(0)=3.5952A.

[0039] ②After the system start-up phase is over, the output voltage and output current of the photovoltaic array are sampled, V(k) represents the output voltage of the kth (k=1,2...,K) sampling, and I(k) represents the kth (k=1,2,...

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Abstract

The invention provides a maximum power point tracking method for rapidly self-adapting step length of a photovoltaic array to solve a technical problem. The method is simple in design thinking and easy to realize; and the step length can be also automatically adjusted to track a maximum power point of the photovoltaic array. According to the invention, the self-adaptive step length v (v= / dP / dV / ) is beyond a neighborhood U (Pmax, epsilon) of the maximum power point by using a logarithm operation form, so that larger stable step length is kept; and within the neighborhood U (Pmax, epsilon) of the maximum power point, the self-adaptive step length v is further rapidly reduced and the step length v of 0 at the maximum power point is guaranteed, so that the self-adaptive step length v is more sensitive and the tracking speed of the system is increased and tracking accuracy of a system is improved.

Description

technical field [0001] The invention relates to a photovoltaic array maximum power point tracking method, in particular to a maximum power point tracking method for rapid self-adaptation of photovoltaic array step size. Background technique [0002] Maximum Power Point Tracking (MPPT) technology is almost the most important part of photovoltaic systems. On the basis of classic methods such as constant voltage method, perturbation and observation method (Perturb and Observe, P&O for short), and incremental admittance method (Incremental Conductance, IncCond for short), a large number of improved MPPT methods have been proposed and applied. [0003] The principle of the constant voltage method is to ignore the influence of the ambient temperature on the system, and use the voltage data corresponding to the maximum power point output obtained from the manufacturer as the output voltage of the photovoltaic array. It is easy to operate and easy to implement, and because the cont...

Claims

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Application Information

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IPC IPC(8): G05F1/66
Inventor 夏银水寇彦宏
Owner NINGBO UNIV
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