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No-load pressurization method, control system and electronic equipment

A no-load, power transmission system technology, applied in control/regulating systems, adjusting electrical variables, testing dielectric strength, etc., can solve the problems of AC system current disturbance, DC voltage step, uncontrollable DC voltage, etc., to avoid current perturbation effect

Pending Publication Date: 2022-07-19
NR ELECTRIC CO LTD +1
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Problems solved by technology

[0004] 1) Since the voltage of the sub-module is lower than the rated working voltage after charging, there will be an AC surge current during the unlocking process, which will bring current disturbance to the AC system;
[0005] 2) The DC charging voltage is generally 0.7 times the rated voltage, and the DC voltage is uncontrollable within the range of 0.7 times to 0.85 times the rated voltage, and there is a process of DC voltage steps

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  • No-load pressurization method, control system and electronic equipment
  • No-load pressurization method, control system and electronic equipment
  • No-load pressurization method, control system and electronic equipment

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Embodiment Construction

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated descriptions will be omitted.

[0031] The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of...

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Abstract

The invention discloses a no-load pressurization method of a modular multilevel converter for a flexible direct current power transmission system, a control system and electronic equipment, the converter comprises six bridge arms, an alternating current side of the converter is provided with an alternating current switch and an alternating current charging resistor, each bridge arm is provided with a plurality of bridge arm sub-modules, the method comprises the following steps: after AC uncontrolled charging of the converter is completed, controlling conduction of partial sub-modules of a bridge arm to output positive voltage, and enabling other sub-modules of the bridge arm to be in a locked state, so that DC voltage is increased, and continuous and controllable no-load pressurization is realized. According to the technical scheme, the direct current voltage can be continuously controlled from the charging voltage to the rated voltage, large current disturbance caused by overall unlocking of the converter can be avoided, and the method is particularly suitable for a no-load voltage boosting test under a weak system.

Description

technical field [0001] The present application relates to the technical field of flexible DC power transmission in power systems, and in particular, to a no-load pressurization method, a control system, and an electronic device. Background technique [0002] Flexible DC transmission uses voltage source converters, which can control active power and reactive power independently and quickly, thereby improving the stability of the transmission system, suppressing the fluctuation of the frequency and voltage of the transmission system, and improving the steady-state performance of the grid-connected AC system. With the increasing depletion of fossil energy and the increasing pressure to improve the environment, China and the world are facing a strategic adjustment of the energy structure, and it is imperative to develop and utilize new energy on a large scale. [0003] In order to conveniently test the insulation level after a long period of outage or maintenance, the DC system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G05F3/16
CPCG01R31/12G01R31/1227G01R31/1272G05F3/16
Inventor 汪楠楠董云龙卢宇田杰李钢潘磊王佳成王江天
Owner NR ELECTRIC CO LTD
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