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A photovoltaic mppt nonlinear control method with sinusoidal disturbance

A nonlinear control, sinusoidal disturbance technology, applied in photovoltaic power generation, control/regulation systems, instruments, etc., to ensure stability, reduce power fluctuations, and reduce parameter measurement requirements.

Inactive Publication Date: 2016-06-29
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The conventional MPPT algorithm continuously searches for the maximum power point, which belongs to the category of optimization, and there is a contradiction between the optimization search speed and the control response speed

Method used

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  • A photovoltaic mppt nonlinear control method with sinusoidal disturbance
  • A photovoltaic mppt nonlinear control method with sinusoidal disturbance
  • A photovoltaic mppt nonlinear control method with sinusoidal disturbance

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with specific embodiments.

[0024] Using the control method of the present invention to use a phase-shifted full-bridge DC / DC controller, the controller includes a main circuit and a control circuit, such as figure 2 As shown, the main circuit includes a precapacitor C sequentially connected between the photovoltaic panel and the DC output in , DC / DC circuit, high frequency transformer, rectifier circuit, output filter inductor L f and capacitance C f The control circuit includes a signal acquisition circuit and a conversion circuit connected to the digital signal processor to acquire current and voltage signals of the main circuit. The DC / DC circuit includes four switching tubes Q1-Q4, switching tube Q1 and switching tube Q3, switching tube Q2 and switching tube Q4 are all complementary actions, that is, when switching tube Q1 is turned on, switching tube Q3 is turned off; and switching tube Q1 and...

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Abstract

The invention discloses a sinusoidal disturbance photovoltaic MPPT nonlinear control method in the field of solar power generation. For the characteristic that the requirement of the incremental conductivity method for the parameter accuracy is high, the method for setting the current sine disturbance and extracting the disturbance value through the DFT is provided by researching the front capacitor dynamic process in the MPPT on the basis of the increment conductivity method and designing an MPPT nonlinear controller through the back stepping method. The incremental electric conductivity calculation accuracy and speed are increased, the system stability is ensured through the design of the nonlinear controller, the MPPT and current integrated control is achieved, the complex logic control in the conventional control is avoided, and the method can be used in solar power generation.

Description

technical field [0001] The invention relates to a photovoltaic power generation device, in particular to a control method for the photovoltaic power generation device. Background technique [0002] At present, there are many algorithms for maximum power tracking (MPPT), such as perturbation and observation method, conductance incremental method, fixed voltage method and so on. Among them, the disturbance observation method has a clear concept, simple principle, and few parameters to be measured, but the compensation of the disturbance voltage has a great influence on the tracking accuracy and speed, and there is a phenomenon of power oscillation near the maximum power point, and it may lose control when the sunshine changes suddenly. Maximum power tracking ability; conductance incremental method has high control stability for MPPT, but it has high requirements for system hardware. In addition, the initialization of voltage has a great impact on the tracking performance durin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 史旺旺张小倩
Owner YANGZHOU UNIV
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