Parallel connection three-terminal direct current power transmission system and power coordination control method of the same

A DC transmission system, coordinated control technology, applied in the direction of power transmission AC network, etc., can solve the problem of high investment cost, achieve the effect of increasing reserve capacity, increasing smoothing reactor, and suppressing DC line faults

Active Publication Date: 2016-09-21
XJ ELECTRIC +2
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  • Abstract
  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to provide a parallel three-terminal direct current transmission system, which is used to solve the problem of high investment cost of the existing three-terminal direct current transmission system

Method used

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  • Parallel connection three-terminal direct current power transmission system and power coordination control method of the same
  • Parallel connection three-terminal direct current power transmission system and power coordination control method of the same
  • Parallel connection three-terminal direct current power transmission system and power coordination control method of the same

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the drawings.

[0018] Such as figure 1 As shown, the parallel three-terminal DC transmission system provided by the present invention includes two power grid commutated current source converters (Line-Commutated Converter, LCC), LCC converters and other corresponding equipment to form a converter station, respectively For station A and station C, station A corresponds to the first LCC converter, and station C corresponds to the second LCC converter. A DC transmission line is connected between the DC side of station A and the DC side of station C. A power substation B is led out from the DC transmission line. The power substation B is mainly composed of a voltage source converter (Voltage Source Converter, VSC) composition. Such as figure 2 As shown, the VSC converter is composed of Full Bridge Modular Multilevel Converter (FB-MMC). The converter station A, station B and station C formed...

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Abstract

The invention relates to a parallel connection three-terminal direct current power transmission system and a power coordination control method of the same. The parallel connection three-terminal direct current power transmission system includes LCC (Line Commutated Converter) rectifier stations and LCC inverter stations, wherein two LCC converters are connected through a direct current power transmission line; the direct current power transmission line is connected with a VSC (Voltage Source Converter); each LCC rectifier station is controlled by a constant power; each LCC inverter station is controlled by the constant direct voltage/constant extinction angle; and the VSC is controlled by the constant power. The power coordination control method includes the steps: respectively acquiring the direct current command values of the two rectifier stations; when the VSC is operated in a rectification mode, the current command value of the LCC inverter station is obtained when the sum of the direct current command values of the two rectifier stations subtracts a set current margin value; and when the VSC is operated in an inversion mode, the current command value of the inverter station is obtained when the difference between the direct current command values of the two rectifier stations subtracts the current margin value. The coordination control strategy is simple and easy to use, and can avoid complicated coordination and cooperation between each terminal of a pure LCC type multi-terminal direction current, and has a great practical engineering value.

Description

Technical field [0001] The invention relates to a parallel three-terminal direct current transmission system and a power coordinated control method thereof, belonging to the field of parallel multi-terminal direct current transmission systems. Background technique [0002] Since the 1950s, the traditional power grid commutated high voltage direct current (Line-Commutated-Converter High Voltage Direct Current, LCC-HVDC) has achieved rapid gains worldwide due to its large-capacity long-distance transmission and fast controllable active power. development of. However, because it uses a thyristor that cannot self-shut off as a commutation device, a certain strength AC system is required to provide the commutation voltage, which makes it have certain limitations and highlights the problem of commutation failure. The occurrence of commutation failure severely limits the transmission power of the DC system, causing the transmission power to suddenly drop from the normal value to a smal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 李少华苏匀李泰陈大鹏彭忠荆雪记胡永昌苏进国孔令凯张艳浩
Owner XJ ELECTRIC
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