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A Calculation Method of Stability Criterion of Tractor-Grid Coupling System Based on Impedance Response Ratio Matrix

A technology of stability criterion and return ratio matrix, which is applied in the direction of AC network circuits, electrical components, circuit devices, etc., to achieve the effects of wide application range, accurate stability judgment, and narrowing of restricted areas

Active Publication Date: 2021-03-16
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

Even so, the accuracy and systematic conservatism of existing art methods still need to be further improved

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  • A Calculation Method of Stability Criterion of Tractor-Grid Coupling System Based on Impedance Response Ratio Matrix
  • A Calculation Method of Stability Criterion of Tractor-Grid Coupling System Based on Impedance Response Ratio Matrix
  • A Calculation Method of Stability Criterion of Tractor-Grid Coupling System Based on Impedance Response Ratio Matrix

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Embodiment Construction

[0041] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. As a specific implementation method of the method of the present invention, the programming environment is set to be MATLAB / Simulink, and the programming language is the C language of MATLAB / Simulink itself.

[0042] Taking the train network cascade system connected to the CRH series two-level EMUs in the high-speed railway as an example, it includes the simplification and calculation of the equivalent source impedance of the front-stage traction network side system, and the equivalent load admittance of the rear-stage EMU side system. Simplify and calculate, calculate the transfer function of the vehicle-network cascade system and obtain the return ratio matrix, estimate the eigenvalue of the return ratio matrix and limit its distribution area, set the forbidden area and obtain the system stability analysis results with low conservatism. ...

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Abstract

The invention discloses a calculation method of the stability criterion of the tractor-network coupling system based on the impedance return ratio matrix. The MIMO cascading system represented by the high-speed rail vehicle-network cascading system includes deriving the equivalent pre-stage output of the calculation system. Impedance, deriving and calculating the equivalent post-stage input admittance of the calculation system, calculating the overall transfer function of the system and obtaining the ratio matrix and its transpose, estimating the eigenvalues ​​of the ratio matrix and the eigenvalues ​​of the transpose matrix of the ratio matrix, and limiting Its distribution area and eigenvalue distribution area are set as restricted areas, and the stability criterion of MIMO system with further reduced conservatism is obtained. The criterion of the invention can simply and effectively analyze the stability of the MIMO cascade system, and is less conservative than the existing singular value criterion, norm criterion and the like.

Description

technical field [0001] The invention relates to the technical field of electric traction AC drive, in particular to a method for calculating stability criterion of a multiple-input multiple-output (MIMO) cascaded control system based on an impedance return ratio matrix of a grid-side converter of an electric traction AC drive system. Background technique [0002] There are various types of automatic control systems in practical production applications, but they can work normally only when the stability conditions are met. Therefore, system stability analysis is a crucial issue in the field of automatic control. [0003] Methods in classical control theory, such as NyquiSt criterion, Bode diagram analysis, etc., can be used to analyze the stability of single-input single-output (SISO) systems. Middlebrook proposed a stability criterion based on the impedance ratio function for the cascaded SISO system, and then many scholars extended the Middlebrook impedance criterion based ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 葛兴来江坷滕冯晓云
Owner SOUTHWEST JIAOTONG UNIV
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