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A high-voltage direct current system commutation failure resistance device based on resistance energy consumption

A high-voltage direct current and commutation failure technology, which is applied to output power conversion devices, power transmission AC networks, electrical components, etc., can solve problems such as commutation failure, prolong service life, improve the ability to resist commutation failure, The effect of low cost of use

Active Publication Date: 2021-01-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

[0002] Line-Commutated-Converter High Voltage Direct Current (LCC-HVDC) has been widely used in the world due to its advantages in long-distance large-capacity power transmission and fast control of active power. The self-turn-off thyristor is used as a commutation device. When the AC system fails, commutation failure may occur on the LCC-HVDC inverter side

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  • A high-voltage direct current system commutation failure resistance device based on resistance energy consumption
  • A high-voltage direct current system commutation failure resistance device based on resistance energy consumption
  • A high-voltage direct current system commutation failure resistance device based on resistance energy consumption

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Embodiment Construction

[0029] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] The present invention provides a high-voltage DC system commutation failure resistance device based on resistance energy consumption, such as figure 1 As shown, the device is connected in parallel in the DC field of the high-voltage direct current transmission system near the side of the converter; the device is connected in series by N sub-modules.

[0031] like figure 2 As shown, each sub-module includes a capacitor, a resistor, and a thyristor type H full bridge composed of thyristors. The thyristor type H full bridge is composed of four groups of thyristors, and the four thyristor groups are composed of several thyristors connected in series. In the thyristor type H full bridge, the cathode of the thyristor group one above is connected to the anode of the thyristor group one below the thyristor group, and the cathode ...

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Abstract

The invention provides a resistor energy consumption-based high-voltage direct current system phase commutation failure defensive apparatus. The apparatus comprises N sub modules connected in series;and each sub module consists of a thyristor type H full bridge and a resistor connected in series, wherein the thyristor type H full bridge consists of four groups of thyristors, every two groups areconnected in series symmetrically left and right, and the central position is connected by a capacitor. The resistor energy consumption-based high-voltage direct current system phase commutation failure defensive apparatus provided by the invention is connected on the side, close to a converter, of a high-voltage direct current power transmission system; in case of a fault, the resistor is input to consume energy, so that the system phase commutation failure defensive capability can be improved; in addition, when a resistor branch works as normal, the capacitor is not input for use, so that alarge amount of harmonic is not generated; meanwhile, after the fault is finished, the thyristors can be switched off reliably to remove the resistor branch; and in addition, automatic charging of thecapacitor can be realized without needing an external power supply.

Description

technical field [0001] The invention relates to a device in the technical field of power transmission and distribution, in particular to a commutation failure resisting device for a high-voltage direct current system based on resistance energy consumption. Background technique [0002] Line-Commutated-Converter High Voltage Direct Current (LCC-HVDC) has been widely used in the world due to its advantages in long-distance large-capacity power transmission and fast control of active power. The self-turn-off thyristor is used as a commutation device. When the AC system fails, commutation failure may occur on the LCC-HVDC inverter side. [0003] During the AC system fault, the DC current of the LCC-HVDC increases rapidly, which is one of the reasons for the commutation failure of the inverter. The DC power is absorbed by means of resistance energy consumption, thereby reducing the DC current, which can effectively reduce the probability of LCC commutation failure on the inverte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02M1/32
CPCY02E60/60
Inventor 郭春义刘博倪晓军赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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