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Hybrid microgrid AC/DC bus voltage stability control method based on switching system

A stable control method and switching system technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as poor stability control of AC and DC bus voltage, and achieve the effects of ensuring stability, expanding applications, and good stabilization effects

Pending Publication Date: 2021-05-25
LIAONING UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0005] Purpose of the invention: The present invention proposes a method for stabilizing the AC-DC bus voltage of a hybrid microgrid based on a switching system, which aims to solve the problem of poor stability control of the AC-DC bus voltage of the hybrid microgrid during switching operation

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  • Hybrid microgrid AC/DC bus voltage stability control method based on switching system
  • Hybrid microgrid AC/DC bus voltage stability control method based on switching system
  • Hybrid microgrid AC/DC bus voltage stability control method based on switching system

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Embodiment Construction

[0077] The present invention will be described in more detail below in conjunction with the accompanying drawings.

[0078] In this paper, aiming at the problem of AC-DC bus voltage stability when the hybrid microgrid is switched between AC-DC microgrid combined grid-connected and combined off-grid operation modes, it is proposed to apply the switching system control theory to the control of interconnected converters. In this way, the stable control of the AC-DC bus voltage is realized. The joint grid-connected and joint-networked operation modes of AC and DC microgrids are regarded as two subsystems, and a switching system model of interconnected converters and hybrid microgrids is established. At the same time, considering the unknown parameters in the mathematical model of the interconnected converter, the stability controller of each subsystem is designed by combining the K-type function and the adaptive backstepping method, and the common Lyapunov function of the two subs...

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Abstract

The invention relates to a hybrid micro-grid AC / DC bus voltage stability control method based on a switching system. The method comprises the following steps: obtaining a mathematical model of an interconnected converter in hybrid micro-grid AC / DC micro-grid combined grid-connected and off-grid operation according to a KVL, and performing park conversion to obtain a mathematical model II1 and a mathematical model II2; augmenting the mathematical model II1 and the mathematical model II2 to obtain a switching system model I1 and a switching system model I2; in combination with unknown parameters, establishing a switching system model II1 and a switching system model II2 containing the unknown parameters; respectively designing stability controllers for the subsystem 1 and the subsystem 2 through combination of a backstepping method and an improved adaptive method, and constructing a common Lyapunov function of the subsystem 1 and the subsystem 2 at the same time; and determining the switching rule of the subsystem 1 and the subsystem 2 according to the operation mode of the hybrid micro-grid, and ensuring the stability of the switching process by the common Lyapunov function. The method has a good stabilizing effect on the alternating current and direct current bus voltage of the hybrid micro-grid.

Description

technical field [0001] The invention relates to the technical field of hybrid micro-grid AC-DC bus voltage control, in particular to a hybrid micro-grid AC-DC bus voltage stability control method based on a switching system. Background technique [0002] Energy is an important material basis for economic and social development. Since the industrial revolution, the world's energy consumption has increased dramatically, and fossil energy resources such as coal, oil, and natural gas have been consumed rapidly. Traditional thermal power generation with coal, natural gas, oil, etc. as the main fuel will produce a large amount of greenhouse gases during the power generation process, which will have a bad impact on the ecological environment, especially the emission of greenhouse gases will lead to increasingly severe global climate change, and the human society Sustainable development is seriously threatened. At the same time, fossil energy such as coal, oil, and natural gas are...

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Application Information

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IPC IPC(8): H02J3/38H02J3/24H02J5/00
CPCH02J3/24H02J3/381H02J5/00H02J2203/20
Inventor 孙丽颖李哲
Owner LIAONING UNIVERSITY OF TECHNOLOGY