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Withdrawal device and method for series converter of hybrid direct-current power transmission system

A power transmission system, hybrid DC technology, applied in the direction of circuit devices, AC network circuits, electrical components, etc., can solve the problems of lack of versatility

Active Publication Date: 2019-02-19
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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  • Withdrawal device and method for series converter of hybrid direct-current power transmission system
  • Withdrawal device and method for series converter of hybrid direct-current power transmission system
  • Withdrawal device and method for series converter of hybrid direct-current power 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[0124] (a2) Blocking the voltage source converter that needs to be withdrawn from the inverter station;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 withdrawal device and method for a series converter of a hybrid direct-current power transmission system. The method herein includes: controlling a thyristor converter, to bewithdrawn, of a rectifier converter station to close a direct-current side parallel bypass switch, locking the thyristor converter to be withdrawn, opening a direct-current side isolator and openingan alternating-current side incoming wire switch; controlling a voltage source converter, to be withdrawn, of an inverse converter station to make a direct-current side parallel bypass circuit, locking the voltage source converter to be withdrawn, opening the direct-current side isolator, and opening an alternating current side incoming wire switch; resuming operation power of the hybrid direct-current power transmission system. The withdrawal device and method herein have the advantages that the online withdrawal difficulty of a hybrid converter can be effectively overcome, online withdrawalof a series VSC (voltage source converter) is achieved, alternating and direct current shock upon withdrawal is reduced, and safety of an alternating and direct current power transmission system is better protected.

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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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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