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An Analysis Method of Power System Transient Stability Based on Coupling Evaluation Index

A transient stability and power system technology, applied in the field of power systems, can solve problems such as obvious nonlinear and high-dimensional characteristics, difficult problems, and no power electronic power system transient stability analysis methods and frameworks, to achieve Effects of Overcoming High Dimensionality and Nonlinear Challenges

Active Publication Date: 2022-03-29
ZHEJIANG UNIV
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Problems solved by technology

However, since transient stability analysis needs to deal with nonlinear differential equations, it is much more difficult than dealing with linear differential equations
For power electronic power systems, its nonlinear and high-dimensional characteristics are obvious, and there is still no effective transient stability analysis method and framework for power electronic power systems

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  • An Analysis Method of Power System Transient Stability Based on Coupling Evaluation Index
  • An Analysis Method of Power System Transient Stability Based on Coupling Evaluation Index
  • An Analysis Method of Power System Transient Stability Based on Coupling Evaluation Index

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Embodiment Construction

[0070] The purpose of the invention is to propose a new power system transient stability analysis framework to solve the difficulty of transient stability analysis caused by nonlinearity and high dimensionality of power electronic power systems, and traditional small signal stability analysis methods do not Suitable for problems in transient stability analysis. In the present invention, the topology structure of the three-machine DC micro-grid is studied, and the topology structure is as follows: figure 1 shown. This figure shows a typical power electronic power system, the whole system consists of two photovoltaics and one energy storage.

[0071] The rated DC bus voltage of the DC microgrid is set to 300V, the rated load is 1Ω, and the type of photovoltaic module used is KC200GT. The photovoltaic panel of PV1 consists of 20 modules of this type in series and 6 in parallel, while the photovoltaic panel of PV2 consists of this type of module. The module consists of 20 module...

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Abstract

The invention relates to the stability analysis technology in the field of power system, and aims to provide a transient stability analysis method of the power system based on coupling evaluation index. Including: establishing a space model for the state of the power system, using the coupling evaluation index and nonlinear decoupling method to decouple the space model, and approximately transforming the original high-order nonlinear system into a series of decoupled first-order quadratic and second-order second-order quadratic system; then use low-order quadratic system analysis tools to judge the attractive domain of each state variable, and reflect the transient stability of the power system through the relationship between the value of the state variable and the obtained attractive domain. According to the coupling evaluation index and the eigenvalue of the linear part, the invention screens different coupled pairs and isolated state variables to guide the decoupling of the system. Compared with the traditional Lyapunov method, it can significantly reduce the conservatism of the results and guide the parameter design more effectively.

Description

technical field [0001] The invention relates to a power system transient stability analysis method based on a coupling evaluation index, namely a nonlinear decoupling method based on the coupling evaluation index, and belongs to the stability analysis technology in the field of power systems. Background technique [0002] Most of the renewable energy sources are connected to the power system through power electronic devices. Compared with the traditional power system dominated by synchronous machines, the power electronic power system has new characteristics, which are mainly manifested in that the inertia of the power electronic power system is low, and the state variables of the system are easily changed in a large range when the system is disturbed. This seriously affects the system stability, especially the transient stability. [0003] At present, the stability research of the power electronic power system mainly focuses on the small signal stability analysis, and has ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/06G06Q50/06H02J3/00H02J3/32
CPCG06Q10/06393G06Q50/06H02J3/00H02J3/32
Inventor 夏杨红李悦彭勇刚韦巍
Owner ZHEJIANG UNIV
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