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Independent micro-grid stability control method based on switching system

A stable control method and technology for switching systems, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems such as poor stability and achieve the effect of smooth switching

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 stable control method for an independent microgrid based on a switching system, the purpose of which is to solve the problem of poor stability of the existing independent microgrid control method

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  • Independent micro-grid stability control method based on switching system
  • Independent micro-grid stability control method based on switching system
  • Independent micro-grid stability control method based on switching system

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Embodiment Construction

[0092] The present invention will be described in more detail below in conjunction with the accompanying drawings.

[0093] Microgrid is a nonlinear system with uncertainty, and using a linear model to analyze the stability of the system may lead to system collapse. Therefore, it is of great significance to apply the nonlinear switching system to the switching of the main control unit of the independent microgrid.

[0094] In response to the above problems, this paper first regards the independent microgrid with the energy storage system as the main control unit and the main control unit of the diesel generator as two subsystems, and uses the virtual synchronous generator three-order practical model for the energy storage system to establish the switching subsystem I For the model, the synchronous generator model is used as the switching subsystem II model. The nonlinear controllers of the two subsystems are designed separately by using Backstepping, and the Lyapunov function...

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Abstract

The invention relates to an independent micro-grid stability control method based on a switching system, and the method comprises that: an energy storage system is taken as an independent micro-grid of a main control unit, and a subsystem I of a practical model of a third-order virtual synchronous generator is built; a diesel generator is used as an independent micro-grid of a main control unit, and a subsystem II of a synchronous generator model is established; nonlinear controllers of a subsystem I and a subsystem II are respectively designed by applying Backstepping, and Lyapunov functions of the two subsystems are constructed at the same time to form a multi-Lyapunov function; and the switching law of the subsystem I and the subsystem II is designed by adopting a hard charging strategy, and the stability of the system is ensured by applying a multi-Lyapunov function and residence time method. No matter whether the system uses the energy storage device or the diesel generator as the main control unit, the stability can be quickly achieved under the action of the controller, the controller can continuously maintain the stability of the voltage and the frequency of the system, and smooth switching is achieved under the condition that power failure is not needed.

Description

technical field [0001] The invention relates to the technical field of independent micro-grid stabilization, in particular to a method for controlling the stability of an independent micro-grid based on a switching system. Background technique [0002] An independent microgrid refers to a power distribution system that combines small power generation units (distributed power sources), energy storage devices, and loads. It can be connected to the conventional power grid and operated in parallel, or it can be operated independently as an independent micro-grid. Typical energy sources in an independent microgrid include conventional generator sets (diesel generators, fuel cells) and renewable energy sources (such as wind power or photovoltaic systems, etc.). The nature of renewable energy is decentralized, and due to the influence of various factors such as natural climate conditions, the output of renewable energy distributed power is intermittent and difficult to control. Th...

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Application Information

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IPC IPC(8): H02J3/38H02J3/24H02J3/32
CPCH02J3/24H02J3/32H02J3/381H02J2203/20H02J2300/10H02J2300/24H02J2300/40Y02E10/56
Inventor 孙丽颖林永鑫
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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