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A hardware-in-the-loop simulation method and system structure of an AC traction electric drive system

A semi-physical simulation, electric drive technology, applied in the field of system structure, can solve the problem of inability to effectively suppress the deviation of the output phase angle, and achieve the effect of overcoming the sudden change of power grid frequency, wide range of amplitude value change, and stable operation.

Active Publication Date: 2016-09-07
CHINA RAILWAYS CORPORATION +1
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  • Abstract
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  • 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 grid frequency changes greatly and the input signal contains a large amount of noise (voltage harmonics). The problem that the deviation of the output phase angle cannot be effectively suppressed

Method used

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  • A hardware-in-the-loop simulation method and system structure of an AC traction electric drive system
  • A hardware-in-the-loop simulation method and system structure of an AC traction electric drive system
  • A hardware-in-the-loop simulation method and system structure of an AC traction electric drive system

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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): compare the input reference signal with the output signal generated by the voltage controlled oscillator phase difference and sent to the filter.

[0045] 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 (Analog or Linea...

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Abstract

The invention discloses a semi-physical simulation method and system structure of an AC traction electric transmission system, which is suitable for a phase-locked loop of a double-four-quadrant structure circuit, including outputting an input signal through a phase detector after undergoing Hilbert transformation. Phase angle; for the output signal generated by the digital signal synthesizer, the same method is used to obtain its phase information; and the loop filter is used to eliminate the phase difference between the two, and the digital signal synthesizer outputs the control signal. The invention can overcome sudden changes in the frequency of the power grid, work stably in a wider frequency range and a larger amplitude variation range, and can work stably when the voltage amplitude of the grid changes greatly and contains relatively large noise.

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