Power electronic power system transient stability analysis method based on direct method

A transient stability, power electronics technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as conservative discriminant results and difficult energy function construction.

Active Publication Date: 2020-01-10
TIANJIN UNIV
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Problems solved by technology

The main advantage of this method is that the speed of discrimination is fast, and the mode and degree of system instability can be given. However, there are still limitations in the construction of energy functions in detailed models and the conservativeness of discrimination results.

Method used

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  • Power electronic power system transient stability analysis method based on direct method
  • Power electronic power system transient stability analysis method based on direct method
  • Power electronic power system transient stability analysis method based on direct method

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Embodiment Construction

[0036] The specific process of transient stability analysis based on the direct method is as follows: figure 1 shown.

[0037] The invention is based on the direct method, introduces the mixed potential function theory to construct the overall Lyapunov energy function of the system, and proposes a relatively specific analysis method for the transient stability of the power electronic power system. Technical scheme of the present invention is as follows:

[0038] Step 1: Determine the system model

[0039] Based on the current research on the simplification method of the mathematical model, the transient stability analysis of the power electronic power system at the device level, using the power electronic converter model, the power grid is simplified to an ideal power supply with impedance; for the subsystem level and the global power system If the level analysis is used, the equivalent modeling of the converter is required.

[0040] Step 2: Construct the Lyapunov energy fu...

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Abstract

The invention relates to a power electronic power system transient stability analysis method based on a direct method. The method comprises the following steps: 1, determining a system model, 2, constructing a Lyapunov energy function: firstly, establishing a mixed potential function P (i, v) according to a reasonably simplified and determined system model, and secondly, constructing a Lyapunov type energy function of the system in combination with a stability discrimination theorem in a mixed potential function theory, and solving a differential value of the Lyapunov type energy function, andfinally, judging the transient stability of the system through the characteristics of the energy function and the differential value thereof, and 3, estimating the critical energy of the system.

Description

technical field [0001] The invention relates to the field of transient stability analysis of a power electronic power system, specifically a method for analyzing the transient stability of a power electronic power system by proposing a complete transient stability analysis process based on a direct method. Background technique [0002] At present, combined with the development of new energy grid-connected power generation, flexible DC transmission and micro-grid technologies, power electronic converters are more and more widely used in power systems. In the modern power system, all aspects of power generation, transmission, transformation, distribution, power consumption and energy storage basically involve power electronic equipment, and the power system shows a clear trend of power electronics. [0003] The wide application of power electronic devices in the power system greatly enhances the controllability of the system and brings higher transmission performance to the sy...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/24
CPCH02J3/00H02J3/24
Inventor 车延博贾晶晶徐健梅李明
Owner TIANJIN UNIV
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