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Direct current circuit breaker simulation method and device

A technology of DC circuit breaker and simulation method, which is applied in the direction of circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems that are not suitable for online simulation, and increase the accuracy of simulation performance, reduce the amount of calculation, and improve the simulation speed

Active Publication Date: 2019-04-26
XJ ELECTRIC +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a DC circuit breaker simulation method and device to solve the defect that the prior art is not suitable for online simulation

Method used

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  • Direct current circuit breaker simulation method and device
  • Direct current circuit breaker simulation method and device
  • Direct current circuit breaker simulation method and device

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Embodiment 1

[0035] High-voltage DC circuit breakers are hybrid DC circuit breakers, including electronic components such as mechanical switches and IGBTs. Such as figure 1 As shown, the high-voltage DC circuit breaker includes three branches: the main branch ①, the transfer branch ②, and the discharge branch ③. The main branch ① is composed of a mechanical switch 1 connected in series with a small number of full-bridge sub-modules SM; the transfer branch ② is composed of a large number of full-bridge sub-modules connected in series SM; The circuit principle of the full bridge sub-module is as follows: figure 2 As shown, it includes IGBT bridge arm 4, capacitor 5, and discharge resistor 6.

[0036] The invention discloses a simplified modeling method and corresponding device model of a high-voltage DC circuit breaker applied to real-time simulation. By optimizing the two main branches ① and the transfer branch ② of the cascaded full-bridge type DC circuit breaker, In order to achieve t...

Embodiment 2

[0049] If it is determined that the DC current will only flow in one direction, it can also be as follows Figure 5 As shown, in Embodiment 1, after the remaining full-bridge sub-module SM on the transfer branch is simplified into a diode full-bridge module SM', the pair of diagonal bridge arms of the diode full-bridge module SM' is deleted according to the current flow direction. Two diodes keep the corresponding bridge arms open to further reduce the amount of model calculations. Except for the diode full-bridge module, other contents are the same as those in Embodiment 1, and will not be repeated in this embodiment.

[0050] Device embodiment

[0051] In order to realize the simulation using the simplified simulation model of the high-voltage DC circuit breaker introduced above, a simulation device for the simplified simulation model of the high-voltage DC circuit breaker is provided correspondingly. The device includes a processor, a memory and corresponding input and out...

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Abstract

The invention relates to a direct current circuit breaker simulation method and device. The direct current circuit breaker simulation method comprises the steps that a diode full-bridge module is usedfor simulating all full-bridge sub-modules of a transfer branch; and four bridge arms of the diode full-bridge module are each composed of one diode, and the upper and lower bridge arms are connectedin parallel with an equivalent capacitor and an equivalent discharge resistor. According to the characteristics of a cascaded full-bridge type direct current circuit breaker, the transfer branch is simplified by removing an IGBT, only four diodes are reserved to ensure bidirectional charging of the parallel capacitor, equivalent circuit impedance is achieved, the calculated amount is effectivelyreduced in real-time simulation, and the simulation speed is increased.

Description

technical field [0001] The invention relates to a DC circuit breaker simulation method and device, belonging to the field of power electronics. Background technique [0002] Compared with the traditional flexible direct current transmission system (based on IGBT series technology), the flexible direct current transmission system based on modular multilevel converter (MMC) has attracted much attention in recent years because of its simple structure and easy engineering implementation. It has attracted extensive attention from experts and scholars at home and abroad. [0003] At present, one of the factors restricting the application of half-bridge MMC in the field of long-distance DC transmission and flexible DC grid is that it has no ability to suppress bipolar short-circuit faults on the DC side. Scholars have developed a variety of methods to suppress bipolar short-circuit faults: changing the topology of MMC , full-bridge and half-bridge hybrid topologies, and DC circuit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H9/08H02J3/36
CPCH02H7/268H02H9/08H02J3/36Y02E60/60
Inventor 陈朋李泰荆雪记孙攀磊鲁庆华张群于海陈大鹏韩伟刘超刘磊
Owner XJ ELECTRIC
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