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Dual-mode stability control method for microgrid based on switching system

A stable control method and switching system technology, applied in the field of micro-grid, can solve problems such as oscillation, switching instability, and affecting power supply reliability, and achieve the effects of ensuring reliability, preventing oscillation, and ensuring stability

Active Publication Date: 2022-03-08
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Application Information

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Problems solved by technology

In the traditional microgrid, P / Q control is selected in the grid-connected operation mode, and V / F control is selected in the island operation mode, so that switching between P / Q control and V / F control will occur during the switching process. Oscillation, resulting in unstable switching, will affect the reliability of power supply

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  • Dual-mode stability control method for microgrid based on switching system
  • Dual-mode stability control method for microgrid based on switching system
  • Dual-mode stability control method for microgrid based on switching system

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Embodiment Construction

[0113] In order to enable those skilled in the art to better understand the technical solution of the application, the application will be described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the application. .

[0114] This embodiment adopts a conventional microgrid structure, such as figure 1As shown, in order to simplify the analysis, the DC side of the microgrid is equivalently replaced by a DC voltage source. The inverter considers the topology of a conventional three-phase inverter. The microgrid inverter circuit and control structure are as follows: figure 2 shown. According to the characteristics of the filter, the L-type filter is used in the grid-connected topology, and the LC-type filter is used in the island topology. The topology diagram of the grid-connected operation mode of the microgrid is as follows image 3...

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Abstract

This application provides a dual-mode stability control method for a microgrid based on a switching system, including: considering the grid-connected operation mode and the islanded operation mode of the microgrid as two subsystems, and establishing the grid-connected operation mode model and the islanded operation mode model under the dq coordinates respectively Operation mode model; through the augmentation of the grid-connected operation mode model and the island operation mode model, the switching system model of the microgrid is established, that is, the grid-connected operation mode switching subsystem and the island operation mode switching subsystem are obtained; the backstepping method is used to design and The nonlinear controllers of grid-connected operation mode switching subsystem and island operation mode switching subsystem are used to construct a common Lyapunov function for the grid-connected operation mode switching subsystem and island operation mode switching subsystem; the switching law is designed for the switching system model of the microgrid . The control method can effectively ensure the stability of switching between the two operating modes and prevent oscillation during the switching process.

Description

technical field [0001] The present application relates to the field of micro-grid technology, in particular to a dual-mode stability control method for a micro-grid based on a switching system. Background technique [0002] Microgrid includes grid-connected operation mode and island operation mode. Under normal conditions, the microgrid and the large grid operate in parallel, and the voltage and frequency of the microgrid are consistent with those of the large grid, and both supply power to the load. Island operation mode to maintain load power supply, and then connect to the large power grid after the fault problem is resolved. In the traditional microgrid, P / Q control is selected in the grid-connected operation mode, and V / F control is selected in the island operation mode, so that switching between P / Q control and V / F control will occur during the switching process. Oscillation, resulting in unstable switching, will affect the reliability of power supply. Contents of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/381H02J3/24H02J3/388H02J2203/20
Inventor 孙丽颖张鹏飞
Owner LIAONING UNIVERSITY OF TECHNOLOGY