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Bipolar ultrahigh voltage DC power transmission system, and control system and method thereof

A UHV DC and power transmission system technology, applied in the direction of power transmission AC network, etc., can solve the problems of adjusting power exchange, unable to realize, unable to meet power demand, etc., and achieve the effect of eliminating frequency offset

Pending Publication Date: 2016-11-30
ABB (SCHWEIZ) AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technology cannot meet the different power requirements of the first AC grid and the second AC grid; for example, it is impossible to dynamically adjust the power between the bipolar UHVDC transmission system and the first AC grid and the second AC grid respectively exchange

Method used

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  • Bipolar ultrahigh voltage DC power transmission system, and control system and method thereof

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Embodiment Construction

[0012] Each pole of the bipolar UHVDC transmission system includes a converter group, which are respectively a rectification-side converter group and an inverter-side converter group. The converter group includes two twelve-pulse converters connected in series at the DC end. The two converters are connected through one DC terminal, and the other DC terminal is respectively connected to the local UHV DC transmission line and the grounding electrode, which can be referred to as a high-voltage converter and a low-voltage converter, respectively.

[0013] figure 1 One end A of a bipolar UHVDC power transmission system connected to two AC grids in layers according to an embodiment of the present invention is shown. like figure 1 As shown, the first pole of the bipolar UHVDC power transmission system 1 adopts a converter group 10, which is connected to the other end B of the bipolar UHVDC power transmission system 1 through the first pole UHVDC line 11 (not shown ). like figure...

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Abstract

The invention provides a bipolar ultrahigh voltage DC power transmission system, and a control system and method thereof. The control system comprises a first control module used for controlling change of voltages of the DC end of a first high-voltage current transformer among high-voltage current transformers of the bipolar ultrahigh voltage DC power transmission system; and a second control module used for controlling change of voltages of the DC end of a first low-voltage current transformer among low-voltage current transformers of the bipolar ultrahigh voltage DC power transmission system, wherein the first high-voltage current transformer and the first low-voltage current transformer belong to a first pole of the bipolar ultrahigh voltage DC power transmission system, and the change direction of the voltages of the DC end of the first high-voltage current transformer under the control of the first control module is opposite to the change direction of the voltages of the DC end of the first low-voltage current transformer under the control of the second control module. Different power demands of a first AC power network and a second AC power network can be satisfied, and power exchange respectively between the bipolar ultrahigh voltage DC power transmission system and the first AC power network and the second AC power network can be dynamically adjusted.

Description

technical field [0001] The present invention relates to high voltage direct current transmission technology, more specifically, relates to bipolar extra high voltage direct current transmission technology. Background technique [0002] Compared with the traditional HVDC transmission technology, bipolar UHVDC transmission technology can provide DC transmission with a voltage level of ±800kV and above. The main characteristics of UHV DC transmission are large transmission capacity, long transmission distance and high voltage, which can be used for asynchronous networking of power systems. [0003] For example, patent application CN101242139A discloses a bipolar UHV DC power transmission system. Each pole uses two 12-pulse converters connected in series at the DC end. The two converters are connected through one DC terminal, and the other DC terminal is respectively connected to the high-voltage bus and the low-voltage bus, which can be referred to as a high-voltage converter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCY02E60/60H02J3/36
Inventor 马茨·安德森蔡蓉谢海莲张利东
Owner ABB (SCHWEIZ) AG
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