Derivation method for three-dimensional asymptotic stability domain of AC/DC hybrid micro-grid system

An AC-DC hybrid, asymptotically stable technology, applied in AC network circuits, AC network load balancing, single AC networks with different frequencies, etc., can solve problems such as system instability

Pending Publication Date: 2022-03-01
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0003] However, in the AC / DC hybrid microgrid system, most of the loads are connected to the bus through closed-loop controlled converters, which can be regarded as constant power loads with negative impedance characteristics, which are equivalent to adding positive feedback during disturbances, which is very easy causing system instability

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  • Derivation method for three-dimensional asymptotic stability domain of AC/DC hybrid micro-grid system
  • Derivation method for three-dimensional asymptotic stability domain of AC/DC hybrid micro-grid system
  • Derivation method for three-dimensional asymptotic stability domain of AC/DC hybrid micro-grid system

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[0022] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. It does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] Such as figure 1 Shown is a schematic flowchart of a method for deriving a three-dimensional asymptotically stable domain of an AC / DC hybrid microgrid system provided by an embodiment of the present invention, and the method includes:

[0024] Step 1. According to the topology and control strategy of the AC-DC hybrid micro-grid system, the energy function model of the micro-grid syst...

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Abstract

The invention discloses a derivation method for a three-dimensional asymptotic stability domain of an AC / DC hybrid micro-grid system. The derivation method comprises the following steps: firstly, obtaining an energy function model of the micro-grid system under the charging and discharging conditions of an energy storage unit according to the topology and control strategy of the AC / DC hybrid micro-grid system; according to the obtained energy function model, establishing a corresponding Lyapunov function P * by using a mixed potential function method, and obtaining a first-order derivative dP * / dt of the Lyapunov function P * to time; and according to the Lyapunov second stability theorem, obtaining a region which simultaneously meets the conditions that the Lyapunov function P * is greater than zero and the first-order derivative dP * / dt of the Lyapunov function P * to time is less than zero, wherein the region is an asymptotic stability region. According to the method, the asymptotic stability domain of the system can be effectively deduced and known, the influence trend of parameter change on the size of the asymptotic stability domain is obtained, and a design criterion is provided for system parameter optimization design.

Description

technical field [0001] The invention relates to the technical field of an AC / DC hybrid microgrid system, in particular to a derivation method for a three-dimensional asymptotically stable domain of an AC / DC hybrid microgrid system. Background technique [0002] The micro-grid system is a micro-integrated energy system composed of distributed power sources such as wind power and photovoltaics, as well as various loads, energy storage devices and various types of converters. According to different system voltages, micro-grids can be divided into AC type, DC type and AC and DC hybrid three categories. Among them, the AC-DC hybrid microgrid has become the preferred microgrid mode for the development and utilization of distributed new energy due to the advantages of both the AC microgrid and the DC microgrid. With the continuous development of wind energy, solar energy and other new energy power generation, more and more intermittent and unstable power sources appear in the micr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/13G06F30/20G06Q50/06H02J3/02H02J3/32H02J3/38G06F111/10G06F113/04
CPCG06F17/13G06F30/20G06Q50/06H02J3/02H02J3/32H02J3/381G06F2111/10G06F2113/04H02J2203/20H02J2300/24H02J2300/28Y02E10/56
Inventor 刘欣博
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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