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Switching method for parallel multiterminal direct-current transmission system control mode

A technology of multi-terminal DC power transmission and control mode, applied in parallel operation of DC power supply, power transmission AC network, etc., can solve the problems of voltage setting terminal and current control terminal conversion, etc., to improve the speed and system stability, fast and stable The effect of conversion

Inactive Publication Date: 2016-08-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During stable operation, you will often encounter the problem of switching between the voltage setting terminal and the current control terminal

Method used

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  • Switching method for parallel multiterminal direct-current transmission system control mode
  • Switching method for parallel multiterminal direct-current transmission system control mode
  • Switching method for parallel multiterminal direct-current transmission system control mode

Examples

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Embodiment

[0019] After the three-terminal DC transmission system runs smoothly, the second bipolar 12-pulse inverter station B3 quickly changes the current margin from 0.1p.u to 0.0p.u, and the first bipolar 12-pulse inverter station B2 changes the current margin from 0.0 p.u quickly changes to 0.1p.u, and at the same time adjust the second bipolar 12-pulse inverter station B3 or the first bipolar 12-pulse inverter station B2 converter transformer tap position to realize the conversion of the control mode between the two inverter stations . The larger the tap position adjustment, the faster the control mode switching rate between the two inverter stations.

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Abstract

The invention discloses a switching method for a parallel multiterminal direct-current transmission system control mode, and belongs to the technical field of electrical equipment operation control. According to control mode switching, after a multiterminal direct-current transmission system operates stably, current margin of an inversion station needing to switch the control mode is changed and transferred to the original current control end from the original voltage determining end, the gear of a converter transformer tap of any convertor station is adjusted, and the voltage setting end and the current control end are switched to achieve stable operation of the multiterminal direct-current transmission system. Under the stable operation condition of the parallel multiterminal direct-current transmission system, the control mode between inversion terminals is switched, and the control mode between the inversion terminals can be switched fast and stably just through simple steps. The speed of quitting operation of the individual convertor station is greatly increased, and system stability is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of electric equipment operation control, and in particular relates to a control mode conversion method for a parallel multi-terminal direct current transmission system. Background technique [0002] In the regional grid interconnection, the regional grids are interconnected through the DC transmission system, which is conducive to the realization of asynchronous operation and isolation between the regional grids, and can overcome the stability problems caused by the long-distance interconnection of the AC power system with excessive capacity. , improve the dynamic quality of the regional power grid, and improve the stability of the regional power grid. However, most of the traditional DC transmission systems are double-ended systems, which can only realize point-to-point DC power transmission. When DC interconnection is used between multiple AC systems, multiple DC transmission lines are required, which will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J3/36
CPCY02E60/60H02J1/10H02J3/36
Inventor 韩民晓翟冬玲姚蜀军王英沛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)