Device and method for withdrawing series converters of a hybrid direct current transmission system

A power transmission system, hybrid DC technology, applied in circuit devices, AC network circuits, electrical components, etc., can solve problems such as lack of versatility, and achieve the effects of simple structure, convenient operation, and protection and safety

Active Publication Date: 2022-03-29
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN106655125A proposes a method based on a single-valve group online input and exit in a hybrid DC system. The proposed method uses a voltage source converter with a full-bridge sub-module, which is not suitable for a voltage source with a half-bridge sub-module. type converter, not universal

Method used

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  • Device and method for withdrawing series converters of a hybrid direct current transmission system
  • Device and method for withdrawing series converters of a hybrid direct current transmission system
  • Device and method for withdrawing series converters of a hybrid direct current transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] A preferred embodiment 1 is:

[0121] The control unit performs the following steps when the discrimination unit detects that the hybrid direct current transmission system needs to perform a converter exit operation:

[0122] (1) Control the rectifier converter station to increase the firing angle, and control the DC voltage of the inverter converter station to decrease to the range that allows the converter to exit;

[0123] (2) Control the voltage source converter that needs to be exited from the inverter station to perform the following two operations, and the operation sequence of the two operations is not in particular order:

[0124] (a2) Blocking the voltage source converter that needs to be withdrawn from the inverter station;

[0125] (b2) Close the parallel bypass circuit on the DC side;

[0126] (3) To control the voltage source converter that needs to exit from the inverter station, perform the following two operations, and the operation sequence of the tw...

Embodiment 2

[0136] A preferred embodiment 2 is:

[0137] The control unit performs the following steps when the discrimination unit detects that the hybrid direct current transmission system needs to perform a converter exit operation:

[0138] (21) Control the rectifier converter station to increase the firing angle, and control the DC voltage of the inverter converter station to decrease to the range that allows the converter to exit;

[0139] (22) To control the thyristor converter that needs to be withdrawn from the rectifier station, perform the following two operations, two parts

[0140] The order of operations is in no particular order:

[0141] (a22) Close the DC side parallel bypass switch;

[0142] (b22) Thyristor converters that need to be withdrawn from the block rectification converter station;

[0143] (23) To control the thyristor converter that needs to be withdrawn from the rectifier station, perform the following two operations, two parts

[0144] The order of operati...

Embodiment 3

[0163] A preferred embodiment 3 is:

[0164] The method for exiting the converter includes the following steps:

[0165] (1) Control the rectifier converter station to increase the firing angle, and control the DC voltage of the inverter converter station to decrease to the range that allows the converter to exit;

[0166] (2) Control the voltage source converter that needs to be exited from the inverter station to perform the following two operations, and the operation sequence of the two operations is not in particular order:

[0167] (a2) Blocking the voltage source converter that needs to be withdrawn from the inverter station;

[0168] (b2) Close the parallel bypass circuit on the DC side;

[0169] (3) To control the voltage source converter that needs to exit from the inverter station, perform the following two operations, and the operation sequence of the two operations is not in particular order:

[0170] (a3) Disconnect the DC side isolation switch;

[0171] (b3) ...

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Abstract

The invention discloses a device and method for withdrawing series converters of a hybrid direct current transmission system, including the following content: controlling the thyristor converters that need to be withdrawn from a rectification converter station to close the parallel bypass switch on the DC side, and blocking the thyristor converters that need to be withdrawn converter, disconnect the DC side isolation switch, and disconnect the AC side incoming line switch; control the voltage source converter that needs to exit the inverter station to close the parallel bypass circuit on the DC side, and block the voltage source converter that needs to exit switch, disconnect the DC side isolating switch, disconnect the AC side incoming line switch; and finally restore the operating power of the hybrid DC transmission system. The invention can effectively solve the problem of online withdrawal of the hybrid converter, realize the online withdrawal of the series VSC converter, reduce the AC and DC current impact during withdrawal, and better protect the safety of the AC and DC transmission system.

Description

technical field [0001] The invention belongs to the field of hybrid direct current transmission, and in particular relates to a device and method for withdrawing series converters of a hybrid direct current transmission system. Background technique [0002] HVDC systems can be divided into two types: conventional HVDC systems based on thyristor technology (LCC-HVDC) and flexible HVDC systems based on fully controlled voltage source converters (VSC-HVDC). Among them, the conventional direct current transmission system (LCC-HVDC) has the advantages of low cost, low loss, and mature operation technology. The station occupies a large area. The new generation of flexible DC transmission system has the advantages of decoupling control of active power and reactive power, power supply to passive network, compact structure, small footprint, and no commutation failure on the inverter side. There are defects such as high cost and large loss. In recent years, the hybrid DC transmissi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/36
CPCH02J3/005H02J3/36Y02E60/60
Inventor 赵文强王永平黄志岭俞翔杨建明卢宇李海英
Owner NR ELECTRIC CO LTD
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