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A Voltage Reconfiguration Method Based on Phase Locked Loop

A technology of voltage reconstruction and phase-locked loop, which is applied to power lines, transportation and packaging, and vehicle parts, etc., can solve the problems of frequency jump, shock, and long time of frequency modulation and phase modulation, etc., to increase speed, reduce adverse effects, Reduces the effect of frequency fluctuations

Inactive Publication Date: 2016-11-30
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing phase adjustment technology is realized by frequency conversion and phase shifting. This method needs to use two phase-locked loops, and there are also problems such as frequency hopping, frequency modulation and phase modulation time. Tradition has a big impact

Method used

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  • A Voltage Reconfiguration Method Based on Phase Locked Loop
  • A Voltage Reconfiguration Method Based on Phase Locked Loop
  • A Voltage Reconfiguration Method Based on Phase Locked Loop

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Embodiment Construction

[0029] The present invention will be further described below with reference to the drawings and embodiments.

[0030] 1. Basic principles

[0031] Using the voltage reconstruction method of the phase-locked loop, set the two power supply voltage signals as u A , U B , K is the input signal switch, the output frequency of the phase-locked loop is f’, the output angle is θ’, and the power supply voltage amplitude is u mA , U mB , The reconstructed voltage amplitude of the phase-locked loop is u’ m , Then the voltage u'reconstructed by the phase-locked loop is:

[0032] u’=u’ m ×sin(θ’)

[0033] Where u’ m ∈[min(u mA ,u mB ), max(u mA ,u mB )].

[0034] Take the voltage reference from u A To u B Switch as an example to illustrate the switching process:

[0035] 1) Phase A phase lock phase, the phase lock loop locks the phase A power supply, and set the instantaneous value of the A phase power supply to u A , Then

[0036] u’=u’ m ×sin(θ’)=u mA ×sin(θ’)=u A

[0037] 2) In the switching ...

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Abstract

The invention discloses a voltage reconstruction method based on a phase-locked loop. An inverter is controlled by a control system to supply power to neutral sections, flexible phase splitting of a train without outage through electricity is achieved, a voltage signal is reconstructed by using angles output by the phase-locked loop and timely measurement reference voltage amplitudes, a new reference voltage signal is formed, phase conversion can be conducted on the voltage output by the inverter rapidly, and phase lock can be conducted on a corresponding reference voltage signal. By means of the method, the phase adjustment speed of the voltage output by the inverter can be improved, the frequency fluctuation can be reduced in the phase adjustment process, and the adverse effect on a system can be lowered in the phase adjustment process.

Description

Technical field [0001] The present invention relates to an application where uninterrupted power is overpowered and phase splitting, and an inverter is used to supply power to the neutral section. Background technique [0002] There are many ways for electric locomotives (EMUs) to pass power and separate phases. In the early days, the train speed was slow, and manual power phase separation was usually adopted. The phase separation signs were set in the phase separation area to direct the driver to operate the power phase separation. Before reaching the neutral section, the driver first reduces the traction level to 0, disconnects the auxiliary system, and then disconnects the main circuit breaker on the primary side of the traction transformer, so that the locomotive passes through the neutral section without electricity. After the locomotive enters the power supply area of ​​the next phase power supply arm, the driver closes the main circuit breaker, activates the auxiliary syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60M3/04
Inventor 熊成林马俊鹏吴瑕杰冯晓云
Owner SOUTHWEST JIAOTONG UNIV
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