A Phase Switching Method Realizing Fast Adjustment of Inverter Reference Voltage Phase

A reference voltage and phase switching technology, which is applied in 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 frequency fluctuations, eliminate adverse effects

Inactive Publication Date: 2017-04-12
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • A Phase Switching Method Realizing Fast Adjustment of Inverter Reference Voltage Phase
  • A Phase Switching Method Realizing Fast Adjustment of Inverter Reference Voltage Phase
  • A Phase Switching Method Realizing Fast Adjustment of Inverter Reference Voltage Phase

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with drawings and embodiments.

[0032] 1. Basic principles

[0033] The phase amplitude switching method of the present invention, such as Figure 6 and Figure 7 As shown, let the two power supply voltage signals be u A , u B , the phase-locked loop output angles are θ A , θ B , and θ A with theta B Not the traditional [0,2π] angle value, but a cumulative value, the reference voltage amplitude is u’ m , to determine the phase adjustment speed coefficient K θ

[0034] K θ =(t-t θs ) / t θa

[0035] Among them, K θ ∈[0,1]

[0036] Construct the reference voltage as follows

[0037] u'=u' m sin(θ i +K θ Δψ)

[0038] The electric locomotive moves from the power supply arm A to B, and when the phase is adjusted in the neutral section, the controller issues an instruction to reconstruct the reference voltage of the control system:

[0039] u'=u' m sin(θ A +K θ Δψ)

[0040] In the for...

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Abstract

The invention discloses a phase switching method for quickly adjusting the reference voltage phase of the inverter. The control system controls the inverter to supply power to the neutral section to realize the train's flexible phase separation without power failure. The control system uses voltage sensors and The phase-locked loop obtains the phase information of the input voltage signal of the corresponding power supply arm and further obtains the phase difference △ψ, uses the phase adjustment coefficient Kθ to systematically reconstruct the reference voltage signal during the phase amplitude adjustment process, and switches the reference voltage after the adjustment process is completed. The invention can improve the phase adjustment speed of the output voltage of the inverter, reduce the frequency fluctuation in the phase adjustment process, and completely eliminate the adverse influence of the phase adjustment process on the system.

Description

technical field [0001] The invention relates to an application occasion in which an inverter is used to supply power to a neutral section through uninterrupted power and over-current phase separation. Background technique [0002] There are many methods for electric locomotive (EMU) over-voltage phase separation. In the early days, the speed of trains was relatively slow, and manual over-power phase separation was usually used. There was a phase-separation sign in the phase-separation area to instruct the driver to operate over-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 power supply arm of the next phase, the driver closes the main breaker, start...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60M3/04
Inventor 熊成林吴瑕杰马俊鹏刁飞冯晓云
Owner SOUTHWEST JIAOTONG UNIV
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