Phase switching method for rapidly adjusting phase of reference voltage of inverter

A reference voltage and phase switching technology, which is applied in power lines, transportation and packaging, and vehicle parts, etc., can solve problems such as impact, long time of frequency modulation and phase modulation, and frequency jump, so as to increase speed, reduce frequency fluctuations, and eliminate adverse effects

Inactive Publication Date: 2015-11-04
SOUTHWEST JIAOTONG UNIV
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  • 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

Method used

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  • Phase switching method for rapidly adjusting phase of reference voltage of inverter
  • Phase switching method for rapidly adjusting phase of reference voltage of inverter
  • Phase switching method for rapidly adjusting phase of reference voltage of inverter

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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 rapidly adjusting a phase of a reference voltage of an inverter. The method comprises the following steps of controlling the inverter to supply power to a neutral section by using a control system so that a train flexibly passes through a neutral section with no power failure; exerting the control system to obtain phase information of an input voltage signal of a corresponding power supply arm through a voltage sensor and a phase-locked loop and exerting the control system to further obtain a phase difference Delta Upsilon; systematically reconstructing a reference voltage signal in the phase amplitude adjusting process by using a phase adjusting coefficient K Theta; and switching the reference voltage after the adjusting process is finished. The phase switching method for rapidly adjusting the phase of the reference voltage of the inverter, disclosed by the invention, is advantaged in that the phase adjusting speed of an output voltage of the inverter can be increased, frequency fluctuations in the phase adjusting process can be reduced and unfavorable effects of the phase adjusting process on the system can be completely eliminated.

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 Applications(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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