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Method and system for determining transient stability margin of AC/DC hybrid system

An AC-DC hybrid, transient stability technology, applied in AC network circuits, power transmission AC networks, circuit devices, etc., can solve the problem that the transient stability margin assessment is not accurate enough, the DC system model is not accurate enough, and cannot be used in detail. Characterizing the dynamic behavior of DC systems

Active Publication Date: 2022-03-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, the DC system model established in this class is not accurate enough to describe the dynamic behavior of the DC system after a fault in detail, such as the disturbance caused by the AC system disturbance that may have a significant impact on the transient stability of the AC-DC hybrid system. DC commutation failure
[0006] Therefore, in the prior art, commutation failure is rarely considered when determining the energy function, making the evaluation of transient stability margin inaccurate

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  • Method and system for determining transient stability margin of AC/DC hybrid system
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  • Method and system for determining transient stability margin of AC/DC hybrid system

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[0068] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments 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.

[0069] The purpose of the present invention is to provide a method and system for determining the transient stability margin of an AC / DC hybrid system, so as to accurately realize the temporary stability margin determination of the AC / DC hybrid system in the scenario of commutation failure on the DC inverter side caused by an AC fault. Assessment of State Stability Margin.

[0070] In order to make the above objects, features and advantages of the present inve...

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Abstract

The present invention relates to a method and system for determining the transient stability margin of an AC / DC hybrid system. Firstly, a network structure maintenance model of the AC / DC hybrid system is established, wherein the synchronous generator adopts a 6-order electromechanical model, and the DC adopts a standard electromagnetic model. Secondly, according to the universal energy function model, the sixth-order electromechanical model of the synchronous generator and the network structure maintenance model of the AC / DC hybrid system are respectively rewritten to determine the transient energy function of the AC / DC hybrid system; again, the trapezoidal integral path method is used for calculation The energy function change curve of the AC-DC hybrid system after the fault is used to analyze and obtain the transient stability criterion of the AC-DC hybrid system. Finally, the limit cut-off time of the system is quickly calculated by using the dichotomy method, and the AC-DC hybrid system is realized. Evaluating the transient stability margin of the connected system. The present invention accurately realizes the evaluation of the transient stability margin of the AC-DC hybrid system under the scene of commutation failure on the DC inverter side caused by the AC fault.

Description

technical field [0001] The invention relates to the technical field of an AC / DC hybrid system, in particular to a method and system for determining a transient stability margin of an AC / DC hybrid system. Background technique [0002] Due to the reverse distribution of energy bases and load centers, the DC transmission technology based on LCC-HVDC has been successfully applied to the field of long-distance large-capacity power transmission due to its high efficiency and low cost. Since the transmission technology was first put into commercial operation in Sweden, nearly 200 HVDC projects have been built around the world. In China, regional power grids have been interconnected through AC and DC transmission lines, of which DC transmission lines account for 1 / 3 of the transmission capacity. However, when the AC transmission line near the inverter station is disturbed, the probability of commutation failure of the DC inverter is very high. AC failure accompanied by commutation...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 王增平胡加伟王彤褚璐王柄然乔鑫
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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