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Starting method for flexible direct current transmission system

A power transmission system, flexible DC technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. , the effect of suppressing AC and DC overcurrent, and simple operation

Inactive Publication Date: 2013-04-24
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Tang Guangfu, Kong Ming et al.’s “A Startup Method for Modular Multilevel Converter Flexible DC Transmission System” (Patent Application Publication No.: CN201110100456.1) mentioned that one end of the AC system charges two stations of the passive system The starting process of the flexible DC system, this method is only applicable to the starting of the passive system by the modular multilevel converter, and the instantaneous overcurrent will be generated when the passive side converter is unlocked

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  • Starting method for flexible direct current transmission system
  • Starting method for flexible direct current transmission system

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Embodiment Construction

[0027] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The present invention provides a method for starting a flexible direct current transmission system, which effectively suppresses excessive voltage and current disturbances generated during the starting process of a flexible direct current system through simple sequential control operations, including the following implementation steps:

[0029] (1) Pole connection of the converters to be put into operation: close the isolation switch on the DC side of the converters to complete the DC side connection of each converter; the pole connection operation of each converter is in no particular order;

[0030] (2) If the converter to be put into operation is connected to the active AC system, the charging of the converter is completed by sequentially closing the converter incoming switch and the bypass switch of the ch...

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Abstract

The invention discloses a starting method for a flexible direct current transmission system. The flexible direct current transmission system comprises a two-end or multi-end voltage source transverter connected by aid of a direct-current circuit, a direct current side of the voltage source transverter is connected with an isolation knife switch, and an alternating current side is connected with a wire-inlet switch through a group of charging resistors and a bypass switch which are in parallel connection. The starting method comprises the following steps that the transverter is in electrode connection, the transverter is charged, a fixed direct current voltage control transverter reduces voltage and unlocks, direct current voltage is established; a non-direct-current voltage control transverter unlocks; and after unlocking is finished, direct current voltage instructions of the fixed direct current voltage control transverter enable voltage to be increased to a rated value according to set increasing and decreasing rate. The method can void overvoltage caused by controller overshooting in the unlocking process of the fixed direct current voltage control transverter, effectigvley supresses alternating current over-current generated during unlocking of the fixed direct current voltage control transverter, and effectively suppresses alternating and direct current overcurrent generated during the unlocking process of the non-fixed direct current voltage control transverter.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission in power systems, and in particular relates to a starting method for a flexible direct current transmission system. Background technique [0002] Flexible DC transmission uses voltage source converters, which can independently and quickly control active power and reactive power, thereby improving system stability, suppressing system frequency and voltage fluctuations, and improving the steady-state performance of grid-connected AC systems. Flexible DC transmission has great advantages in new energy grid connection, distributed generation grid connection, island power supply, urban distribution network power supply and other fields, so the research on flexible DC transmission related technologies is of great significance. [0003] For the flexible DC transmission project in actual operation, due to the limitation of the primary equipment, the voltage and current disturb...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02M1/36
CPCH02M1/36Y02E60/60H02J3/36H02M1/32H02M7/483H02M7/7575
Inventor 李钢田杰董云龙胡兆庆李海英
Owner NR ELECTRIC CO LTD
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