Unlock instant, AI-driven research and patent intelligence for your innovation.

Online power-taking circuit and system of DC power transmission system current limiter

A technology of DC transmission system and current limiter, applied in the direction of electrical components, etc., can solve the problems such as the inability to detect the current limiter and the voltage difference in the flexible DC transmission system

Active Publication Date: 2018-09-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires that there must always be a voltage difference between the two ends of the device when it is working.
2. For the case where there is no voltage difference between the two ends of the device during normal operation, only an external power supply can be used for power supply
[0004] In summary, at present, there is no reliable solution to the problem that the flexible DC transmission system cannot directly and effectively provide power for the detection of current limiters, communication equipment, and power electronic equipment drives.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Online power-taking circuit and system of DC power transmission system current limiter
  • Online power-taking circuit and system of DC power transmission system current limiter
  • Online power-taking circuit and system of DC power transmission system current limiter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] see figure 1 , figure 2 with image 3 , the online power-taking circuit of the current limiter of the DC transmission system proposed in this embodiment specifically includes: a first inductor, a second inductor, a power electronic switch, a third inductor, and a rectifier energy storage unit, the first inductor is coupled to the second inductor, Because the coupling coefficient is between 0 and 1, when it is 0, there is no coupling. In this case, for figure 2 The second circuit in and image 3 The third circuit in can also be used. The main circuit of the current limiter constituted with the power electronic switch, the power electronic switch is closed under normal working conditions, the inductance value of the main circuit of the current limiter is the first value, when it is detected that the current of the main circuit exceeds the preset threshold value, The power electronic switching switch is turned off, and the inductance value of the main circuit of the ...

Embodiment 2

[0068] This embodiment provides an online power-taking system for a current limiter in a DC transmission system, including: connected state monitoring, control, and protection circuits and any of the above-mentioned online power-taking circuits for a current limiter in a DC power transmission system. When in use, the state monitoring , control, and protection circuits are used to monitor, control, protect, and communicate with the outside world for the online power-taking circuit of the current limiter of the DC transmission system, specifically including monitoring the voltage, current, and residual energy of the energy storage circuit generated by the third inductance. Trigger the power electronic switching switch, over-voltage and over-current protection of the online power-taking circuit, etc. In addition, when connected with the outside world, the monitoring control circuit is also used to communicate with the outside world.

[0069] In summary, the online power-taking sy...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an online power-taking circuit and system of a DC power transmission system current limiter, and relates to the technical field of the flexible DC power transmission. The onlinepower-taking circuit of the DC power transmission system current limiter comprises a first inductor is coupled with a second inductor and is connected with a power electronic selector switch so as toform a current limiter main circuit; a third inductor is coupled with the first inductor and connected with a rectifier energy storage unit so as to form an online power-taking circuit; since the first inductor is coupled with the second inductor and connected with the power electronic selector switch to form the current limiter main circuit, the inductance value of the current limiter main circuit is small when the power electronic selector switch is turned on; when the current exceeds one threshold, the power electronic selector switch is turned off, the inductance value of the current limiter main circuit is greatly increased; since the third inductor is coupled with the first inductor, two ends of the third inductor produces sensing voltage and sensing current when the main circuit current is changed in the first inductor, and the energy is stored through the rectifier energy storage unit so as to provide power supply for driving the power electronic equipment in the main circuit.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to an online power-taking circuit and system for a current limiter of a direct current transmission system. Background technique [0002] Flexible DC transmission system is an important direction of the current power system development. The structure of flexible direct current transmission system is similar to that of high voltage direct current transmission. It is a new type of power transmission technology based on voltage source converter, self-shutdown device and pulse width modulation technology. It has the advantages of no commutation failure, no communication between converter stations, and easy construction of a multi-terminal DC system. There are a large number of detection, communication equipment and power electronic devices in the flexible DC system, but there are certain difficulties in providing driving power for these detection, communica...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00
CPCH02J5/005
Inventor 许军张慧媛刘宏伟
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)