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
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[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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