A transient current measuring device
A measurement device and transient current technology, applied in the direction of voltage/current isolation, etc., can solve the problems of inability to measure the transient current of the MMC flexible DC converter valve sub-module for a long time, and inability to supply power in real time without interruption all day long, and achieve light weight. , the effect of good insulation and large dynamic range
Active Publication Date: 2022-04-29
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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Problems solved by technology
Therefore, the measurement and monitoring of transient currents lays the foundation for the safe and stable operation control of multi-level modular converter valves or other equipment. current measurement
[0003] Therefore, it is necessary to provide a transient current measuring device to solve the deficiency that the prior art cannot measure the transient current of the MMC flexible DC converter valve sub-module for a long time
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[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings. In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0039] A transient current measuring device (such as figure 1 shown), it is characterized in that the device includes: a current sensor for online measurement of the transient current of the multi-level flexible DC converter valve s...
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Abstract
The present invention provides a transient current measuring device, comprising: an on-site measuring device, a remote monitoring device, and an energy-sending optical fiber; the on-site measuring device is connected to the remote monitoring device through an energy-sending optical fiber; the on-site measuring device includes: a current sensor and a photoelectric converter; the remote monitoring device includes: an electro-optical converter and a power distribution cabinet; the output end of the electro-optical converter is connected to the input end of the photoelectric converter through the energy sending optical fiber. The technical solution provided by the invention adopts the laser energy delivery system, which realizes the isolation of high potential power supply and improves the reliability of power supply; conducts remote online real-time measurement through the optical fiber communication system to ensure the safety of the measurement personnel; adopts shielding box and protection The small chamber reduces electromagnetic interference and improves the accuracy of measurement; the current sensor with electro-optical material characteristics has the advantages of small size, light weight, good insulation, wide frequency band, large dynamic range, no electromagnetic interference and good safety.
Description
technical field [0001] The invention belongs to the field of electric direct current transmission, and in particular relates to a transient current measuring device. Background technique [0002] As an emerging DC transmission technology, flexible DC transmission has the characteristics of no need for AC side voltage support, flexible control, high power quality, and small footprint. It is widely used in grid interconnection, renewable energy grid connection, island power supply and urban grid power supply. and other market areas. As the core equipment of flexible DC power transmission - the flexible DC converter valve, the MMC structure is often used at present. When the MMC flexible DC converter valve works normally, the IGBT of the sub-module is continuously turned on and off and the transient current generated by the charging and discharging of the capacitor poses a threat to the safe operation of the internal components of the sub-module and the valve control equipment...
Claims
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IPC IPC(8): G01R15/24
CPCG01R15/24
Inventor 胡榕宗文志池浦田冯静波邓卫华
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD