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Full-bridge thyristor energy-dissipation sub-module and auxiliary commutation control method

A technology of sub-module and thyristor, which is applied in the field of full-bridge thyristor energy-consuming sub-module and its control in commutation failure, can solve problems such as limited auxiliary commutation effect, achieve good auxiliary commutation effect, improve stability, and realize The effect of self-charging

Active Publication Date: 2021-04-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

Most of the existing auxiliary commutation topologies only start from the aspect of providing auxiliary commutation voltage, and the effect of auxiliary commutation is limited

Method used

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  • Full-bridge thyristor energy-dissipation sub-module and auxiliary commutation control method
  • Full-bridge thyristor energy-dissipation sub-module and auxiliary commutation control method
  • Full-bridge thyristor energy-dissipation sub-module and auxiliary commutation control method

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Embodiment Construction

[0028] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] The invention provides an embedded full-bridge thyristor energy-consuming sub-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.

[0030] Such as figure 2 As shown, the full-bridge thyristor energy dissipation sub-module includes capacitors, resistors and full-bridge thyristors. The full-bridge thyristor is composed of four thyristor groups VT1-VT4, and each thyristor group is composed of multiple thyristors in series. The number of thyristors is determined according to the system voltage and the voltage level of the thyristors. For example, when the system voltage is 30KV, you can choose 7 Thyristors with a voltage level of 7.2kv are connected in series to form each...

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Abstract

The invention provides an embedded full-bridge thyristor energy-dissipation sub-module for inhibiting an LCC-HVDC commutation failure and an LCC-HVDC auxiliary commutation control method. 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, and the capacitors and the energy-consuming resistors are adopted for connection at the centers of every two groups of thyristors. The full-bridge thyristor energy-dissipation sub-module for suppressing the LCC-HVDC commutation failure is arranged in and connected in series with an inverter-side converter valve bridge arm of a high-voltage direct-current power transmission system, when a converter valve to be turned off detects that the system fails, capacitor and resistor branches of the sub-module are switched on, the capacitors provide auxiliary commutation voltage, and the energy-consuming resistors inhibit the increase of fault direct current, so the commutation failure resistance of the system is improved; and the capacitor and the energy-consuming resistor branches are bypassed when the system operates normally, active loss is not generated.

Description

technical field [0001] The invention relates to an energy dissipation sub-module in the technical field of high-voltage direct current transmission, in particular to a thyristor based energy dissipation full-bridge sub-module (TED-FBSM) and its failure in commutation control method. 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] For the LCC-HVDC system, during the fault period of the AC system, the system's AC bus voltage drops sharply and the DC current rises sharply, which are the two main reasons for the commutation failure of the system. Most of the existing auxiliary commutation topologies only start from the aspect of providing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/00
CPCY02E60/60
Inventor 郭春义海正刚赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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