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Multiport direct-current transmission power coordination control method

A technology of multi-terminal DC transmission and coordinated control, which is applied in the direction of power transmission AC network, AC network with the same frequency from different sources, etc., and can solve complex problems

Inactive Publication Date: 2013-09-11
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

Since the operation of the multi-terminal DC transmission system is more complicated than that of the two-terminal DC transmission, there are not many multi-terminal DC transmission projects that have been put into actual operation in the world, only the Italy-Corsica-Sardinia three-terminal DC transmission project, the United States and Canada There are four projects including the Quebec-New England three-terminal DC transmission project. There is no multi-terminal DC transmission system put into commercial operation in China

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Embodiment Construction

[0026] According to different topology structures, multi-terminal DC coordinated control strategies are also different. The present invention aims at figure 1 Based on the parallel multi-terminal DC transmission system topology in the paper, a method for coordinated control of multi-terminal DC transmission power is proposed.

[0027] like figure 1 In the parallel four-terminal DC system shown, stations 1 and 2 are rectifier stations, and stations 3 and 4 are inverter stations. When the DC power of one or more converter stations changes, the power setting of each converter station needs to be readjusted to ensure that the system can operate at a stable power level.

[0028] The principle of multi-terminal DC power coordinated control is as follows: figure 2 shown. Operators input the DC power commands P01, P02, P03, and P04 of each station. If the input power commands of each station are unbalanced, ΔP in formula 1 is not zero.

[0029] ΔP=P01+ P02 -P03-P04 Formula (3)

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Abstract

The invention relates to a multiport direct-current transmission power coordination control method. An independent multiport controller is arranged in a multiport direct-current electricity transmission system formed by three or more converter stations connected in parallel, a master / slave control structure is adopted to achieve coordination of controllers in the converter stations, the multiport controller serves as a main controller to take charge of power / current definite values of the converter stations, and various converter station pole controllers serve as slave controllers to achieve power / current control of the converter stations. The fact that the whole direct-current system has a stable operation range is guaranteed. The multiport direct-current transmission power coordination control method can meet configuration and switching requirements for normal operation and an operation mode after a fault of the multiport direct-currnet electricity transmission system. When the multiport direct-current electricity transmission system breaks down, if current commands still keep balanced after a certain converter station or a section of a circuit is removed, the rest of the stations of the multiport direct-current electricity transmission system can still operate, and quick recovery of the system after the fault is removed is achieved.

Description

technical field [0001] The invention relates to system design and control and protection devices related to multi-terminal high-voltage direct current transmission, and is suitable for parallel multi-terminal high-voltage direct current transmission composed of current source converters. Background technique [0002] The traditional DC transmission system is a double-terminal system, 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 greatly increase investment costs and operating costs. Multi-terminal HVDC (MTDC) system refers to a DC transmission system with three or more converter stations. Compared with two-terminal high-voltage direct current transmission, multi-terminal direct current transmission is more economical and more flexible in operation. Its most notable feature is that it can realize multi-power supply and multi-drop power receiving...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/06
CPCY02E60/60
Inventor 胡铭傅闯王俊生黎小林刘海彬田杰李海英曹冬明
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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