Thyristor full-bridge energy consumption module for inhibiting LCC-HVDC commutation failure

An LCC-HVDC, commutation failure technology, applied in the field of thyristor full-bridge energy dissipation modules, can solve problems such as commutation failure, and achieve the effect of extending service life, improving the ability to resist commutation failure, and improving stability

Pending Publication Date: 2020-06-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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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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  • Thyristor full-bridge energy consumption module for inhibiting LCC-HVDC commutation failure
  • Thyristor full-bridge energy consumption module for inhibiting LCC-HVDC commutation failure
  • Thyristor full-bridge energy consumption module for inhibiting LCC-HVDC commutation failure

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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 invention provides a thyristor full-bridge energy consumption module that suppresses LCC-HVDC commutation failure, such as figure 1 As shown, the device is connected in series in the bridge arm of the converter valve on the inverter side of the HVDC transmission system.

[0031] Such as figure 2 As shown, each module consists of capacitors, resistors and consists of thyristors. The thyristor full bridge is composed of four groups of thyristors, and the four thyristor groups are composed of several thyristors connected in series. Group 2; the cathode of the upper thyristor of the first thyristor group in the thyristor full bridge is connected to the anode of the lower thyristor of the first thyristor group, and the cathode of the upper thyristor of the second thyristor group is connected to the anode of the lower thyri...

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Abstract

The invention provides a thyristor full-bridge energy consumption module for inhibiting LCC-HVDC (Low Voltage Current Converter-High Voltage Direct Current) commutation failure. Each module consists of four groups of thyristors, capacitors and energy-consuming resistors, every two groups of thyristors are connected in series and are bilaterally symmetrical, the centers of the thyristors are connected by the capacitors, and the resistors are connected with one group of thyristors in series. The thyristor full-bridge energy consumption module for suppressing the LCC-HVDC commutation failure is connected in series in an inverter side converter valve bridge arm of a high-voltage direct-current power transmission system; when a system breaks down, resistance energy consumption is input, attenuation of fault current is accelerated, the commutation failure resisting capacity of the system is improved, a resistance energy consumption branch is bypassed when the system operates normally, and active loss cannot be generated.

Description

technical field [0001] The invention relates to a sub-module in the technical field of high-voltage direct current transmission, in particular to a thyristor full-bridge energy-consuming module for suppressing LCC-HVDC commutation failure. 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 LCC-HVDC increases rapidly, which is one of the reasons for the commutation failure of the inverter. By adding a module with an energy-dissipating resistor to the bridge arm of the converter valve on the inverter side, the impedance of the system is increased, thereby suppressing the increase of the transien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M7/00H02M7/757H02J3/36
CPCH02J3/36H02M1/32H02M7/00H02M7/7575Y02E60/60
Inventor 郭春义海正刚刘博赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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