A Method for Analyzing the Propagation Law of Low Frequency Modulation Signal in Rectifier of HXD Locomotive
A technology of low-frequency modulation and rectifiers, applied in AC network voltage adjustment, harmonic reduction devices, AC network circuits, etc., can solve problems such as IGBT self-locking, transportation paralysis, traction network voltage fluctuations, etc.
Active Publication Date: 2019-03-01
SOUTHWEST JIAOTONG UNIV
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, when a large number of electric locomotives are hoisted up, the network voltage of the traction network fluctuates greatly, causing the relay protection device of the locomotive to operate, the IGBT to self-lock, and even cause the transportation to be paralyzed
The site used the progressive bow raising method of the electric train to suppress the problem, but it could not solve the problem fundamentally
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The analysis object of the method of the present invention is the voltage fluctuation phenomenon of the traction network caused by multi-vehicle access to the traction network. The propagation law of the modulated signal in the rectifier is compared and verified. The main steps include the following aspects:
[0022] 1. Using the method of combining DFT transformation and TLS-ESPRIT, analyze the modal components of the unstable electrical quantity of the traction network; construct the voltage signal u(n) when multiple vehicles are connected to the traction power supply system, and the Hankel matrix X
[0023]
[0024] In the formula, α i , ω i 、A i , θ i are the attenuation coefficient, angular frequency, oscillation amplitude and initial phase of the i-th mode; T s is the sampling period of the signal; p is the order of the si...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for analyzing the propagation law of a low-frequency modulation signal in a rectifier of an HXD locomotive, which includes: digging deep into the hidden information of the actual monitoring data of the traction network and the DC link in the middle of the locomotive, quantifying the relationship between the two, and combining the low-frequency modulation signal with the low-frequency modulation signal in the The propagation law in the rectifier is compared and verified, specifically: using the method of combining DFT transformation and TLS-ESPRIT to analyze the modal components of the unstable electrical quantity of the traction network; constructing the voltage signal u(n) when multiple vehicles are connected to the traction power supply system , Hankel matrix X, and then use the constructed mathematical model to deduce its propagation mechanism under the SPWM algorithm, extract the modal components that cause voltage fluctuations, and analyze the propagation characteristics of unstable voltages through modulation theory. The invention clarifies the mathematical relationship of the harmonic transmission at both ends of the rectifier, and lays a theoretical foundation for the effective suppression of voltage fluctuations.
Description
technical field [0001] The invention belongs to the field of power quality analysis for traction power supply of high-speed railways, and in particular relates to a method for analyzing the propagation law of low-frequency modulation signals in HXD locomotive rectifiers. Background technique [0002] HXD and EMUs are typical nonlinear loads. After adopting the "AC-DC-AC" mode, the shortcoming of low power factor is better overcome. However, when a large number of electric locomotives are hoisted for maintenance, the traction network voltage fluctuates greatly, causing the locomotive relay protection device to operate, the IGBT to self-lock, and even cause transportation paralysis. The site used the progressive bow raising method of the electric train to suppress the problem, but it could not fundamentally solve the problem. [0003] Aiming at this phenomenon, researches have studied the instability of electrical quantity in traction network from the perspective of low-frequ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/12H02J3/01
CPCH02J3/01H02J3/12H02J2203/20Y02E40/40
Inventor 刘志刚张桂南
Owner SOUTHWEST JIAOTONG UNIV