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A Method for Analyzing and Detecting Chaotic Oscillation in AC-DC Parallel Transmission System

A power transmission system, vibration analysis technology, applied in the direction of AC network circuit, power transmission AC network, electrical components, etc., can solve the problems of AC-DC parallel transmission system instability, less analysis and research, collapse, etc., to ensure safe and stable operation Effect

Active Publication Date: 2021-03-16
HARBIN UNIV OF SCI & TECH
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  • Description
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AI Technical Summary

Problems solved by technology

[0004] At present, the application of chaos theory to the analysis and research of AC-DC parallel transmission system oscillation is seldom and lacks systematic and comprehensive analysis and detection, and chaotic oscillation can cause instability or even collapse of AC-DC parallel transmission system

Method used

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  • A Method for Analyzing and Detecting Chaotic Oscillation in AC-DC Parallel Transmission System

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Embodiment Construction

[0032] This embodiment specifically includes the following steps:

[0033] Step 1. Establish an AC / DC parallel transmission system for studying chaotic oscillations, such as figure 1 As shown, it is a two-machine 3-node system;

[0034] Step 2. Establish a system model of the AC-DC parallel transmission system based on the AC-DC parallel system established in Step 1, and mathematically model the DC control system, the DC transmission line, and the AC-DC interface.

[0035] 2.1. This embodiment fully considers the generator rotor motion, DC transmission line, and load dynamic process of the AC-DC transmission system. The AC-DC parallel transmission system model established by combining the above factors is:

[0036]

[0037] In the formula, the state variable x of the system=[δ m ,ω,δ,U,I d , α], respectively expressed as generator power angle, speed, load node voltage phase angle, load node voltage amplitude, DC transmission line current, and rectifier firing angle.

[...

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Abstract

The invention discloses a chaotic oscillation analysis and detection method of an AC-DC parallel transmission system, which belongs to the field of AC-DC parallel transmission. The purpose of this application is to solve the problem that there is no method for analyzing and detecting the chaos of the AC / DC parallel transmission system in the prior art. The present invention constructs an integrated DC control system, a DC transmission line and an AC-DC parallel transmission system with an AC-DC interface, and solves the differential equation of the system to obtain a maximum Lyapunov exponent spectrum diagram and a bifurcation diagram, a maximum Lyapunov exponent spectrum diagram and a bifurcation diagram The bifurcation diagram combines the timing diagram of the state variable at the value point of the special bifurcation parameter and the phase-attractor subgraph to judge the oscillation mode. The invention can evaluate and predict the chaotic oscillation behavior of the AC-DC parallel transmission system, and at the same time, it is also beneficial to the power system personnel to reasonably arrange the operation parameters, so as to ensure the safe and stable operation of the system.

Description

technical field [0001] The invention discloses a chaotic oscillation analysis and detection method, which belongs to the technical field of stability analysis of an AC-DC parallel transmission system, and specifically relates to a chaotic oscillation analysis and detection method of an AC-DC parallel transmission system. Background technique [0002] With the completion of several long-distance, large-capacity AC-DC parallel transmission projects in China, my country will form the world's largest AC-DC interconnection system. Weak connections between AC and DC interconnection systems, long distances, the existence of periodic load switching in the system, and improper configuration of DC transmission control will all cause system oscillations. In the research of chaos in power system, at present, different control methods are concentrated on researching different control methods to restrain chaos in power system at home and abroad. The research results of these literatures ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/36
CPCH02J3/00H02J3/36H02J2203/20Y02E60/60
Inventor 吕艳玲刘琪白红哲王硕毕圣煦
Owner HARBIN UNIV OF SCI & TECH
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