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Online input control method and device of voltage source converter unit

A technology of voltage source converter and control method, which is applied in the direction of power transmission AC network, etc., and can solve the problems of direct current transfer without specific implementation methods

Active Publication Date: 2018-02-23
NR ELECTRIC CO LTD +1
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] The above-mentioned patents all propose that the DC current needs to be transferred from the unit bypass switch to the voltage source converter to be put into operation during the on-line operation of the voltage source converter unit. No specific implementation method given

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  • Online input control method and device of voltage source converter unit
  • Online input control method and device of voltage source converter unit
  • Online input control method and device of voltage source converter unit

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Embodiment Construction

[0035] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] The invention provides a voltage source converter unit control method, which is used to realize the online input of a single voltage source converter when two or more than two converters at the DC pole of a direct current transmission system are operated in series, and can meet the requirements of series hybrid direct current The operation and maintenance needs of the transmission system or the series flexible direct current transmission system.

[0037] In order to achieve the above object, the solution of the present invention is to provide a voltage source converter unit control method for realizing online input of the voltage source converter unit during DC pole operation, the voltage source converter The topology of the unit is as figure 1 As shown, it includes the first unit isolation switch D1, the vo...

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Abstract

The invention discloses an online input control method of a voltage source converter unit. In the states that the voltage source converter to be input is unlocked and the output direct current voltageis zero, the voltage source converter to be input is controlled to output negative direct current voltage; through increase of the amplitude of the negative direct current voltage output by the voltage source converter to be input, the direct current flowing through the voltage source converter to be input is increased, the direct current flowing through a unit by-pass switch of the voltage source converter unit to be input is decreased, and transfer of the direct current from the unit by-pass switch to the voltage source converter to be input in the online input process of the voltage sourceconverter unit is achieved. Correspondingly, an online input device of the voltage source converter unit is provided. By means of the method and the device, online stable input of the voltage sourceconverter in a series hybrid direct current transmission system or a series flexible direct current transmission system can be achieved, and normal stable operation of the other operated converters isnot influenced.

Description

technical field [0001] The invention belongs to the technical field of direct current transmission, and in particular relates to a method and device for controlling the online input of a voltage source converter unit. Background technique [0002] HVDC systems can be divided into two types: conventional HVDC systems based on thyristor converters (LCC-HVDC) and flexible HVDC systems based on fully controlled voltage source converters (VSC-HVDC). Conventional DC transmission systems are low in cost, low in loss, and mature in operation technology. Most of the DC transmission systems currently in operation in the world are LCC-HVDC systems. The system is highly dependent, needs to absorb a large amount of reactive power, and the converter station occupies a large area; while the new generation of flexible DC transmission system has the ability to realize decoupling control of active power and reactive power, and can contribute to the passive network. It has the advantages of p...

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 鲁江卢宇董云龙王永平田杰李海英王柯丁久东肖建民
Owner NR ELECTRIC CO LTD
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