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A Harmonic Stability Analysis Method for High-Speed ​​Railway Vehicle Network System

A high-speed railway and analysis method technology, applied in the direction of circuit devices, AC network circuits, complex mathematical operations, etc., can solve problems such as complex control methods and complex analysis, and achieve the effect of simplifying and pushing methods

Inactive Publication Date: 2021-11-05
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, for the high-speed railway EMU converter system, the double-loop control strategy of the current inner loop and the voltage outer loop is basically adopted. First, the control method is very complicated; in addition, the long-distance traction network introduces a strong nonlinear coupling relationship; Finally, the DC side is also mostly a resistor, and the DC side voltage also has a ripple disturbance component. The product of the changing DC voltage and the control signal makes the analysis more complicated.

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  • A Harmonic Stability Analysis Method for High-Speed ​​Railway Vehicle Network System
  • A Harmonic Stability Analysis Method for High-Speed ​​Railway Vehicle Network System
  • A Harmonic Stability Analysis Method for High-Speed ​​Railway Vehicle Network System

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Embodiment Construction

[0099] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. Such as figure 1 As shown, the high-speed railway vehicle network harmonic stability analysis method of the present invention comprises the following steps:

[0100] Step 1: Establish the two-port network impedance model of the long-distance traction network. The specific implementation is as follows:

[0101] according to figure 2 (a), set up the equivalent Π-type circuit of the long-distance traction network line:

[0102]

[0103] Among them: u in (x,ω) and u out (x, ω) are the input voltage of the long-distance traction network and the output voltage of the load terminal respectively; i in (x,ω) and i out (x, ω) are the input current of the long-distance traction network and the output current of the load terminal respectively; the line propagation coefficient γ and the characteristic impedance Z of the long-distance tract...

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Abstract

The invention discloses a method for analyzing the harmonic stability of a high-speed railway vehicle network system. The method firstly establishes a mathematical model of a dual-port network of a long-distance high-speed railway traction network; The admittance model in the complex frequency domain; finally, based on the impedance analysis theory of the cascaded system, the closed-loop stability of the vehicle-network system is solved, and the grid-side parameters of the vehicle-network system and the EMU control system are analyzed according to the generalized Nyquist stability criterion. parameter stability. The invention uses the impedance model based on the harmonic linearization theory, and can use the linear control theory even under the premise of the nonlinear vehicle-network system, so that the system model is clear and concise; based on the harmonic linearization theory, the harmonic characteristics of the high-speed railway vehicle-network system are obtained , so as to analyze the harmonic stability of the system.

Description

technical field [0001] The invention relates to the technical field of rail transit vehicle-network electrical relations, in particular to a method for analyzing harmonic stability of a high-speed railway vehicle-network system. Background technique [0002] In recent years, with the rapid development of electrified railways, a large number of AC / DC EMUs and electric locomotives have been put into operation, and the nonlinear load of the traction power supply system has been increasing, which has caused harmonic stability problems in the high-speed railway vehicle network system, such as train Harmonic instability such as network low-frequency oscillation and harmonic resonance. For the high-speed railway vehicle-network coupling system, the traction power supply system is a traditional power system, which adopts a single-phase AC power supply system and is a linear system; the Harmony EMU uses a large number of power electronic converters, which is a typical nonlinear syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F17/16H02J3/00
CPCG06F17/16H02J3/00
Inventor 刘志刚陈浔俊
Owner SOUTHWEST JIAOTONG UNIV
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