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Semi-physical simulation method of AC traction electric transmission system and system structure

A semi-physical simulation and electric transmission technology, applied in the field of system structure, can solve the problems such as the inability to effectively suppress the output phase angle deviation, and achieve the effect of overcoming sudden changes in power grid frequency, stable operation, and wide range of value changes

Active Publication Date: 2014-02-26
CHINA RAILWAYS CORPORATION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a hardware-in-the-loop simulation method and system structure of an AC traction electric drive system to overcome the problems in the prior art when the frequency of the power grid changes greatly and the input signal contains a lot of noise (voltage harmonics). The problem that the deviation of the output phase angle cannot be effectively suppressed

Method used

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  • Semi-physical simulation method of AC traction electric transmission system and system structure
  • Semi-physical simulation method of AC traction electric transmission system and system structure
  • Semi-physical simulation method of AC traction electric transmission system and system structure

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Embodiment Construction

[0042] For reference and clarity, descriptions, abbreviations or abbreviations of technical terms used in the following text are summarized as follows:

[0043] The basic structure block diagram of a single-phase phase-locked loop is as follows: image 3 As shown, it includes the following main module units:

[0044] Phase Detector (PD): compares the input reference signal with the output signal generated by the voltage controlled oscillator phase difference and sent to the filter.

[0045] Loop Filter (Loop Filter): Usually a low-pass filter for filtering In the high frequency part, keep the DC part u VOC (t) sent to the voltage-controlled oscillator.

[0046] Voltage Controlled Oscillator (Voltage Controlled Oscillator, VOC): according to u VOC (t) Generate an oscillating signal u 0 (t).

[0047] According to the technical route division of phase-locked loops, it mainly includes the following four types of phase-locked loops:

[0048] Analog phase-locked loop (...

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Abstract

The invention discloses a semi-physical simulation method of an AC traction electric transmission system and a system structure which are suitable for the phase-locked loop of a dual four-quadrant structure circuit. The method comprises the steps of carrying out Hilbert transformation on an input signal and outputting a phase angle through a phase discriminator, using the same method to obtain the phase information for an output signal generated by a digital signal synthesizer, and using a loop filter to eliminate the phase difference of two signals and outputting a control signal through the digital signal synthesizer. According to the method and the system structure, grid frequency mutation can be overcome, the working is stabilized in a wide frequency range and a large amplitude variation range, and when the amplitude variation of grid voltage is large and the grid voltage has large noise, the working can be stabilized.

Description

technical field [0001] The invention relates to the technical field of system simulation, and more specifically relates to a semi-physical simulation method and system structure of an AC traction electric transmission system. Background technique [0002] At present, AC drive electric locomotives have replaced DC drive electric locomotives and are widely used in rail transportation due to their advantages such as high power density and reliability. Divided from the functional modules, its main drive system includes two parts: the grid side converter and the motor side AC converter. Due to the limitation of the switching frequency of the converter, the grid-side converter usually adopts multiple connections to reduce the grid-side current ripple and the DC bus voltage ripple. Please refer to the attached figure 1 , is a schematic diagram of the structure of the main circuit in the prior art with dualization and four quadrants; figure 2 It is a block diagram of the control...

Claims

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Application Information

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IPC IPC(8): G05B17/02
Inventor 佟来生李希宁郭婉露邹焕青
Owner CHINA RAILWAYS CORPORATION