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Control method, device and system of single-phase four-quadrant rectifier output voltage

A four-quadrant rectifier and output voltage technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve problems such as voltage fluctuations, and achieve the effect of reducing influence and fluctuations

Inactive Publication Date: 2014-06-11
CHINA CNR CORPORATION
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a method, device and system for controlling the output voltage of a single-phase four-quadrant rectifier to solve the problem in the prior art that the output voltage of a single-phase four-quadrant rectifier fluctuates greatly

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  • Control method, device and system of single-phase four-quadrant rectifier output voltage

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Embodiment Construction

[0027] The technical solution of the present invention will be described in further detail below through specific embodiments and accompanying drawings.

[0028] figure 2 A schematic flowchart of an embodiment of a method for controlling the output voltage of a single-phase four-quadrant rectifier provided by the present invention. Such as figure 2 As shown, the method may include:

[0029] S201, acquiring a difference signal between the output voltage of the single-phase four-quadrant rectifier and the set reference voltage;

[0030] Specifically, the control of the output voltage of the single-phase four-quadrant rectifier can be realized by means of closed-loop control (for example, voltage outer loop current inner loop control). The ideal output voltage of the single-phase four-quadrant rectifier can be set as the reference voltage, and the actual output voltage of the single-phase four-quadrant rectifier can be detected by the voltage sensor, and the set reference vo...

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Abstract

The invention provides a control method, device and system of single-phase four-quadrant rectifier output voltage. The control method includes the following steps that: a difference value signal between output voltage of a single-phase four-quadrant rectifier and set reference voltage is obtained; voltage regulation and current regulation are respectively performed on the difference value signal, such that a regulated signal can be obtained; amplitude attenuation processing is performed on higher harmonic in the regulated signal, such that attenuated signal can be obtained; pulse width modulation (PWM) is performed on the attenuated signal, such that a modulated pulse signal can be obtained; and the modulated pulse signal is outputted to the single-phase four-quadrant rectifier so as to make the output voltage of the single-phase four-quadrant rectifier maintained in a preset range. According to the control method, device and system of the single-phase four-quadrant rectifier output voltage provided by the invention, the amplitude attenuation processing is performed on the higher harmonic in the signal, and therefore, the fluctuation of the output voltage of the single-phase four-quadrant rectifier can be decreased.

Description

technical field [0001] The invention relates to signal control technology, in particular to a method, device and system for controlling the output voltage of a single-phase four-quadrant rectifier. Background technique [0002] Most of the railway systems in our country adopt a single-phase 25KV power supply mechanism, which supplies power to locomotives through the catenary and returns through the rails. Since the 25KV voltage is too high and only has a single phase, it cannot be directly used for motor control, so there will be a rectification device on the locomotive. Since the rectification device is single-phase, it can work in four quadrants, and energy can flow in both directions, that is Capable of energy feedback, so the rectifier is referred to as a single-phase four-quadrant rectifier. The single-phase 25KV will get a stable DC voltage through the transformer and then through the single-phase four-quadrant rectifier. AC voltage. [0003] The existing control me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/14
Inventor 张林耿辉邹代厚
Owner CHINA CNR CORPORATION