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Control method for photovoltaic grid-connected inverter on basis of back-stepping sliding-mode control

A technology of backstepping sliding mode and control method, which is applied in the field of smart grid, can solve the problems of not considering the influence of external disturbance control performance, not considering the problem of parameter uncertainty, and the controller is not robust, etc., to achieve good engineering Application prospects, good steady-state and dynamic performance, and the effect of improving anti-interference ability

Inactive Publication Date: 2014-07-09
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

There are also literatures that apply the backstepping method to the inverter system, but there are the following problems: 1) The mathematical models of the inverter are all based on the precise model, and the parameter uncertainty in the actual system of the system is not considered; 2) ) did not consider the influence of external disturbance on the control performance, the above two problems lead to the design of the controller is not very robust in practical applications

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  • Control method for photovoltaic grid-connected inverter on basis of back-stepping sliding-mode control
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  • Control method for photovoltaic grid-connected inverter on basis of back-stepping sliding-mode control

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[0029] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0030] A control method for photovoltaic grid-connected inverters based on backstepping sliding mode control is figure 1 The shown single-phase photovoltaic grid-connected system is realized. The single-phase photovoltaic grid-connected system is a two-stage single-phase photovoltaic grid-connected inverter system, which is mainly composed of a photovoltaic array, a DC / DCboost converter, and a single-phase voltage-type full-bridge inverter circuit. The DC / DCboost converter circuit by capacitance C pv , inductance L pv , switch tube S b and diode D 0 Composition, and use the MPPT controller to obtain the maximum power of the photovoltaic array. The single-phase voltage-type full-bridge inverter circuit is composed of a DC / AC inverter and its peripheral circuits and is controlled by a DC / AC controller. The full-bridge inverter circuit includes f...

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Abstract

The invention relates to a control method for a photovoltaic grid-connected inverter on the basis of back-stepping sliding-mode control. The control method is technically characterized in that direct current voltage Udc of a photovoltaic side bus is collected, a mathematical model of a photovoltaic grid-connected single-phase voltage full-bridge inverter is set up, a tracking error of a control variable uac is set, a back-stepping sliding-mode control model of the photovoltaic grid-connected single-phase voltage full-bridge inverter is set up, and the single-phase photovoltaic grid-connected inverter is controlled according to the mathematical model and the back-stepping sliding-mode control model of the photovoltaic grid-connected single-phase voltage full-bridge inverter. The control method is reasonable in design, a back-stepping method and a sliding-mode control method are combined, the stable state and the dynamic property are good, and the control method is suitable for linear and non-linear loads and adapts to engineering application reality, provides a new thought for the inverter control system design and has the good engineering application prospect.

Description

technical field [0001] The invention belongs to the technical field of smart grids, in particular to a control method of a photovoltaic grid-connected inverter based on backstepping sliding mode control. Background technique [0002] At present, the photovoltaic grid-connected technology has become mature and has entered the stage of promotion and use. At the same time, due to a large number of applications with nonlinear and impact loads (such as household appliances, etc.), the harmonics and reactive currents generated by the operation of the public power grid are becoming more and more serious. Therefore, research on photovoltaic grid-connected inverters The control strategy of the system has also become one of the hotspots of research at home and abroad. At present, the inverter control application schemes mainly include double closed-loop control, deadbeat control, repetitive control, etc. Although the above technical schemes have improved the performance of the invert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38
CPCY02E10/56
Inventor 游国栋高洪森侯波李继生侯勇
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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