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Test method for starting of modular multi-level multi-terminal flexible direct-current transmission system

A modular multi-level, DC transmission system technology, applied in the conversion of AC power input to DC power output, power supply testing, electrical components, etc., can solve the problems that do not take into account the differences of modular multi-level converters, etc. Achieve the effect of speeding up the system start-up speed, strong intuitiveness, and preventing the instantaneous current of the converter from being too large

Active Publication Date: 2013-09-18
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0009] Both of the above two methods are based on the start-up process of the two-terminal converter station, and neither takes into account the difference between the modular multi-level converter and the two-terminal system in the case of multi-terminal

Method used

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  • Test method for starting of modular multi-level multi-terminal flexible direct-current transmission system
  • Test method for starting of modular multi-level multi-terminal flexible direct-current transmission system
  • Test method for starting of modular multi-level multi-terminal flexible direct-current transmission system

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Embodiment Construction

[0051] The present invention will be described in detail below with reference to the accompanying drawings, but such illustration and description are to be considered illustrative and exemplary and not restrictive; the invention is not limited to the disclosed embodiments. Any reference signs in the claims should not be construed as limiting the scope.

[0052] When the multi-terminal modular multi-level flexible DC transmission system is started, special attention must be paid to ensuring the safety of equipment and operating personnel during the dynamic process of starting the power transmission system. Analyze the formation mechanism of voltage and current stress, and formulate corresponding control strategies.

[0053] The establishment of DC voltage is the core content of system startup, and its most basic step is to charge the capacitor in the system. However, the charging process of the voltage source converter used in the flexible DC transmission system is different d...

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Abstract

The invention relates to a test method for starting of a modular multi-level multi-terminal flexible direct-current transmission system. The system comprises a plurality of modular multi-level converters connected in parallel. Each of the converters is corresponding to a convertor station and comprises a plurality of sub-modules. The method is characterized in that when any far-end convertor station is unlocked, the input number of the sub-modules is reduced gradually till the normal operation number is reached after double of the number of normal operation sub-modules is input, so that a charging equivalent circuit is free of jumping during unlocking of the station.

Description

technical field [0001] The present invention relates to the technical field of flexible direct current transmission in power systems, in particular to a start-up test method for a modular multi-level multi-terminal flexible direct current transmission system, and in particular to the charging of a modular multi-level converter for flexible direct current transmission in a parallel multi-terminal converter station experiment method. Background technique [0002] The modular multilevel converter (MMC) used for flexible DC transmission adopts a new modular multilevel topology that is more popular in the world. Its core unit, the sub-module (SM), is a half-bridge structure composed of two turn-off power electronic switching devices with antiparallel diodes and a capacitor. figure 1 It is a schematic structural diagram of a modular multilevel converter, which consists of three phase units 1, each phase unit includes up and down symmetrical converter bridge arms, and each convert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/40H02M1/36
CPCH02M1/36H02M7/4835
Inventor 贺之渊杨杰林畅季兰兰马巍巍庞辉孔明
Owner STATE GRID CORP OF CHINA
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