Power system transient stability analysis method based on coupling evaluation index

A technology of transient stability and power system, applied in the field of power system, can solve problems such as lack of power electronic power system transient stability analysis method and framework, difficulty, obvious nonlinear and high-dimensional characteristics, etc.

Active Publication Date: 2020-05-29
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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  • Power system transient stability analysis method based on coupling evaluation index
  • Power system transient stability analysis method based on coupling evaluation index
  • Power system transient stability analysis method based on coupling evaluation index

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Embodiment Construction

[0070] The present invention aims to propose a new power system transient stability analysis framework to solve the difficulty of transient stability analysis caused by nonlinear and high-dimensional power electronic power systems. Traditional small-signal stability analysis methods are not Applicable to transient stability analysis problems. The present invention studies the topological structure of the three-machine DC microgrid, and the topological 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 photovoltaic module model used is KC200GT. The photovoltaic panel of PV1 consists of 20 modules of this type in series and 6 modules in parallel, while the photovoltaic panel of PV2 consists of this type Modules consist of 20 modules connected in series and 5 mod...

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Abstract

The invention relates to a stability analysis technology in the field of power systems, and aims to provide a power system transient stability analysis method based on a coupling evaluation index. Themethod comprises the following steps: establishing a space model for the state of a power system, decoupling the space model by using a coupling evaluation index and a nonlinear decoupling method, and approximately converting an original high-order nonlinear system into a series of decoupled first-order secondary and second-order secondary systems; and judging the attraction domain of each statevariable by using a low-order secondary system analysis tool, and reflecting the transient stability of the power system through the relationship between the numerical value of the state variable andthe obtained attraction domain. According to the method, different coupling pairs and isolated state variables are screened according to the coupling evaluation index and the characteristic value of the linear part and are used for guiding system decoupling. According to the method, high-dimensional and nonlinear challenges of a power electronic power system can be overcome, and compared with a traditional Lyapunov method, the method has the technical advantages that the conservative property of a result can be remarkably reduced, and then parameter design can be guided more effectively.

Description

technical field [0001] The invention relates to a transient stability analysis method of a power system based on a coupling evaluation index, that is, a nonlinear decoupling method based on a coupling evaluation index, which belongs to the stability analysis technology in the field of power systems. Background technique [0002] Most of the renewable energy is connected to the power system through power electronic devices as the interface. As the penetration rate of renewable energy in the power system continues to increase, the trend of power electronics in the power system is becoming more and more obvious. Compared with the traditional power system dominated by synchronous machines, the power electronic power system has new characteristics, mainly manifested in the low inertia of the power electronic power system, and the state variables of the system are easy to change in a large range when the system is disturbed. Thus seriously affecting the system stability, especiall...

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Application Information

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Patent Type & Authority Applications(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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