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A control method for a photovoltaic lcl type grid-connected inverter

A control method and inverter technology, applied in the directions of adaptive control, general control system, control/regulation system, etc., can solve the problem that the fault information of photovoltaic LCL type grid-connected inverter system is rarely estimated, and achieve good tracking Performance and Fault Tolerance, Guaranteed Security, Smooth Curve Changes

Active Publication Date: 2019-01-25
TIANJIN UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

At present, there are few research reports on fault information estimation of photovoltaic LCL grid-connected inverter systems

Method used

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  • A control method for a photovoltaic lcl type grid-connected inverter
  • A control method for a photovoltaic lcl type grid-connected inverter
  • A control method for a photovoltaic lcl type grid-connected inverter

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Embodiment Construction

[0038] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] A control method for a photovoltaic LCL type grid-connected inverter is as follows: figure 1The photovoltaic LCL type grid-connected inverter topology shown is realized. The invention proposes a continuous integral sliding mode fault-tolerant control allocation method based on a high-order sliding mode observer by establishing a mathematical model of a large-scale photovoltaic LCL grid-connected inverter in the case of an uncertain fault and an actuator fault. First, give full play to the advantages of independent design of the virtual control law and control command distribution of control distribution, design the control distribution law, and establish the mathematical model of the photovoltaic LCL grid-connected inverter in the case of uncertain faults and actuator faults ;Secondly, a high-order sliding mode observer is designed to e...

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Abstract

The invention relates to a control method of a photovoltaic LCL type grid-connected inverter. The control method is characterized by comprising the steps of: considering that a photovoltaic LCL type grid-connected inverter system has input uncertainty faults and actuator faults, establishing a fault mathematical model, and setting a fixed control distributive law; establishing a system state high-order sliding-mode observer and state estimation errors thereof according to the fault mathematical model, and adopting the high-order sliding-mode observer for realizing accurate estimation of system fault information; and constructing a continuous integral sliding-mode fault-tolerant controller mathematical model according to the fault mathematical model, the fixed control distributive law, the high-order sliding-mode observer and the state estimation errors thereof, wherein the continuous integral sliding-mode fault-tolerant controller mathematical model is used for processing the actuator faults directly. The control method is reasonable in design, can realize stable control under parameter uncertainty faults and actuator faults, and exhibits good tracking performance and fault tolerance. The control method provides a new idea for the design of a large-scale photovoltaic LCL type grid-connected inverter control system, and has a good engineering application prospect.

Description

technical field [0001] The invention belongs to the technical field of smart grids, in particular to a control method for a photovoltaic LCL type grid-connected inverter. Background technique [0002] Photovoltaic LCL grid-connected inverter is a typical switching nonlinear system. Since the linear control method is greatly limited in this type of system, especially in terms of rapidity and accuracy, the application of modern nonlinear control methods in photovoltaic grid-connected inverter systems has become the current inverter system. One of the research hotspots of controller control. At present, inverter control application schemes mainly include double closed-loop control, deadbeat control, repetitive control, etc. Although all of them have improved the performance of the inverter, there are also problems of varying degrees. [0003] Fault-tolerant control can form different closed-loop control systems based on detected fault information, and can be divided into acti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 游国栋
Owner TIANJIN UNIV OF SCI & TECH
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