A method for measuring electric locomotive frequency coupling impedance
An electric locomotive, coupled impedance technology, applied in the direction of measuring resistance/reactance/impedance, measuring device, measuring electrical variables, etc., can solve the problems of large amount of calculation, too ideal assumption, low feasibility and accuracy, etc., to achieve the measurement process. Reasonable, accurate measurement results, reliable measurement methods
Active Publication Date: 2019-05-31
SOUTHWEST JIAOTONG UNIV
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These methods are not widely used due to the large amount of calculation, too ideal assumptions, low feasibility and low accuracy.
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[0017] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0018] First, according to the coupling relationship between the voltage, current and frequency of electric locomotives one of them is the frequency coupling impedance of the electric locomotive, U t (jω) is the locomotive port voltage phasor at angular frequency ω, I t (jω) is the locomotive port current phasor at angular frequency ω, e j2θ u t * (jω) is the locomotive port coupling voltage phasor at angular frequency ω, e j2θ I t * (jω) is the coupled current phasor at the locomotive port at the angular frequency ω.
[0019] Secondly, the frequency coupling impedance of the electric locomotive To measure, the specific steps are:
[0020] A. The first disturbance injection: inject a voltage (or current) disturbance with frequency ω into the electric locomotive, and the injection method is shown in Figure 1. Collect the...
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The invention discloses an electric locomotive frequency coupling impedance measuring method. The method comprises the steps that according to the electric locomotive voltage and current frequency coupling relationship, a disturbance injection method is adopted for measuring the frequency coupling impedance of an electric locomotive; for each measurement, linearly independent voltage or current perturbation under the same frequency is injected two times, corresponding voltage and current response components and voltage and current coupling components are collected, and therefore the electric locomotive frequency coupling impedance under the specific frequency is obtained; the angular frequency for injecting perturbation is changed every time, and finally the electric locomotive frequency coupling impedance under the wide frequency is obtained. The method has the advantages that the electric locomotive frequency coupling impedance measuring method is obtained through strict formula derivation, and the measuring method is more reliable; the influence on the frequency coupling effect in the electric locomotive is sufficiently considered, the measuring result is more accurate; by adopting the variable control method, the measuring process is more reasonable.
Description
technical field [0001] The invention relates to the technical field of electric locomotive parameter measurement, in particular to a method for measuring frequency coupling impedance of an electric locomotive. Background technique [0002] With the rapid development of my country's electrified railways, more and more EMUs and new electric locomotives are connected, which intensifies the high-power exchange between trains and networks, and harmonic resonance and stability problems occur from time to time, resulting in traction network power supply Interruptions, electric locomotive traction blockade and other issues have seriously affected the normal operation of electrified railways. Existing studies have shown that the mismatch between electric locomotive and traction network parameters will cause harmonic resonance and stability problems; this mismatch can be transformed into the frequency domain impedance mismatch of the vehicle network for research. Therefore, before the...
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IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 胡海涛潘鹏宇宋依桐何正友
Owner SOUTHWEST JIAOTONG UNIV