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 sw

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

[0093]The microgrid is a nonlinear system containing uncertainty, and the stability of the linear model analysis system can cause the system to crash. Therefore, it is important to use a nonlinear switching system to switch to the independent microgrid main control unit.

[0094]For the above problems, this paper first regards the independent micro-grid of the main control unit and the main control unit of the main control unit and the diesel generator, respectively, respectively, and establishing a homage subsystem I use a virtual synchronous generator for the energy storage system. Model, Applying Synchronous Generator Model as a Switch Subsystem II Model. Use backstepping to design two subsystems of nonlinear controllers, and build the Lyapunov function of two subsystems, and finally use multiple Lyapunov functions and residential methods to ensure the stability of the syst...

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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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