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Tractor-network coupled system stability criterion calculation method based on impedance return 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 low conservatism, narrow restricted areas, and accurate stability judgments

Active Publication Date: 2018-01-09
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

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

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  • Tractor-network coupled system stability criterion calculation method based on impedance return ratio matrix
  • Tractor-network coupled system stability criterion calculation method based on impedance return ratio matrix
  • Tractor-network coupled system stability criterion calculation method based on impedance return ratio matrix

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Embodiment Construction

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. As the concrete implementation method of the inventive method, setting programming environment is MATLAB / Simulink, and programming language is the C language of MATLAB / Simulink self.

[0042] Taking the train-network cascading system connected to CRH series two-level EMUs in high-speed railways as an example, it includes the simplification and calculation of the equivalent source impedance of the front-stage traction grid-side system, and the calculation of 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 get the return ratio matrix, estimate the characteristic value of the return ratio matrix and limit its distribution area, set forbidden areas and obtain low conservative system stability analysis results.

[0043] The MIMO ...

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Abstract

The invention discloses a tractor-network coupled system stability criterion calculation method based on an impedance return ratio matrix. A high-speed rail vehicle network cascade system is used as arepresentative MIMO cascade system. The method includes the following steps: deducing the equivalent front-stage output impedance of the system; deducing the equivalent back-stage input impedance ofthe system; calculating the overall transfer function of the system, and getting a return ratio matrix and a transposed matrix thereof; estimating the feature value of the return ratio matrix and thefeature value of the transposed matrix of the return ratio matrix, and limiting the distribution area; and setting a forbidden zone for the distribution area of the feature values, and getting a lessconservative MIMO system stability criterion. The criterion can be used to simply and effectively analyze the stability of the MIMO cascade system, and is much less conservative than the existing singular value criterion, norm criterion or the like.

Description

technical field [0001] The invention relates to the technical field of electric traction AC transmission, in particular to a method for calculating the stability criterion of a multiple-input multiple-output (MIMO) cascade control system based on an impedance-response ratio matrix for a grid-side converter of an electric traction AC transmission system. Background technique [0002] There are various types of automatic control systems in actual production applications, but they can only work normally when they meet the stability conditions. 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 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. Later, many scholars promoted the Middlebrook impedance criterion ...

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Application Information

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