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Method, device and system for inhibiting ring current between large power PWM (Pulse-Width Modulation) rectification power supply modules

A technology of rectifying power supply and circulating current suppression, applied in the field of power system, can solve the problems affecting the security of distribution network, inconsistent switching time of multiple rectifying power supply modules, etc., to achieve the effect of balancing load, improving safety and stability, and suppressing circulating current.

Active Publication Date: 2015-11-11
HUNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] One of the objectives of the present invention is to provide a method, device and system for suppressing circulating current between high-power PWM rectifying power supply modules, so as to solve the problem of inconsistency in the switching time of multiple rectifying power supply modules in the prior art, resulting in circulating current between the rectifying power supply modules Technical Problems Affecting the Safety of Distribution Network

Method used

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  • Method, device and system for inhibiting ring current between large power PWM (Pulse-Width Modulation) rectification power supply modules
  • Method, device and system for inhibiting ring current between large power PWM (Pulse-Width Modulation) rectification power supply modules
  • Method, device and system for inhibiting ring current between large power PWM (Pulse-Width Modulation) rectification power supply modules

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Embodiment 1

[0032] Such as figure 1 As shown, the embodiment of the present invention provides a method for suppressing circulating current between high-power PWM rectifier power supply modules. The high-power PWM rectifier power supply includes a first rectifier power supply module and a second rectifier module. The method includes:

[0033] S10. Collect the three-phase input current of the first rectifying power module to obtain the circulating current between the first rectifying power module and the second power rectifying module;

[0034] S20. Obtain the phase difference of the triangular carrier signal of the first rectifying power module and the second rectifying power module according to the circulating current;

[0035] S30. Calculate the carrier compensation delay time according to the carrier phase difference;

[0036] S40. Adjust the phase of the triangular carrier signal of the first rectifying current module according to the carrier compensation delay time, so as to synchro...

Embodiment 2

[0056] Such as figure 2 and image 3 As shown, the high-power PWM rectified power supply provided by the embodiment of the present invention includes: a rectified power supply main circuit 100 composed of a first rectified power supply module 101 and a second rectified power supply module 102 connected in parallel, a circulating current suppression device 200 and a voltage and current control module 300 .

[0057] Among them, the circulation suppression device 200 provided by the embodiment of the present invention, such as figure 2 and image 3 shown, including:

[0058] The circulating current acquisition module 202 is configured to collect the three-phase input current of the first rectified power supply module, so as to obtain the circulating current between the first rectified power supply module and the second power supply rectification module; The three-phase input current i of the second rectified power module 2a i 2b i 2c The zero-sequence current of the secon...

Embodiment 3

[0066] An embodiment of the present invention also provides a circulation suppression system between high-power PWM rectification power supply modules, including the circulation suppression device described above. Based on the same purpose of the invention, the same technical problem is solved, and the same technical effect is achieved, the embodiments of the present invention will not be repeated one by one.

[0067] To sum up, the embodiment of the present invention provides a method, device and system for suppressing circulating current between high-power PWM rectifying power modules. The circulating current is obtained by collecting the input current of the rectifying power module, and the carrier wave of the two rectifying power modules is obtained according to the circulating current. The phase difference between the two rectifier power modules can be obtained to obtain the carrier compensation delay time. According to the carrier delay time, the phase of the carrier wave...

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Abstract

The invention relates to a method, a device and a system for inhibiting ring current between large power PWM (Pulse-Width Modulation) rectification power supply modules. The method comprises steps of collecting three phase input current of a first rectification power supply module to obtain ring current between the first rectification power supply module and a second rectification power supply module; obtaining a phase difference of triangular carrier signals of the first rectification power supply module and the second rectification power supply module according to the ring current; calculating a carrier compensation delay time according to the carrier phase difference; and adjusting a phase of the triangular carrier signal of the first rectification power supply module according to the carrier compensation delay time so as to synchronize phases of the triangular carrier signals of the first rectification power supply module and the second rectification power supply module. The invention can effectively inhibit ring current between two rectification power supply modules, balances loads of the two rectification power supply modules, and improves safety and stability of a power distribution network.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method for suppressing circulating current between high-power PWM rectification power supply modules. Background technique [0002] In industrial production such as electrolysis, electroplating, and electrochemistry, rectifier power supplies are widely used and are key equipment directly related to product quality and production efficiency. The traditional rectifier power supply is composed of power diodes or thyristors, which will inject a large amount of harmonic current into the grid, resulting in increased loss and failure rate of production equipment. With the development of industry, the demand for high-power rectifier power supply has increased sharply, especially the high-power PWM rectifier with low harmonic content and high power factor loss has attracted attention, especially in the electroplating and electrolytic copper foil industries. [0003] At present, d...

Claims

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Application Information

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IPC IPC(8): H02M7/12
Inventor 罗安肖华根丁士启阳敏王同陈燕东周杰丁振
Owner HUNAN UNIV
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