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ccc-phc hybrid cascade DC converter, rectifier station, inverter station and power transmission system

A CCC-PHC, hybrid cascading technology, applied in the direction of invertible conversion equipment, electrical components, output power conversion devices, etc., to achieve the effects of optimized operation mode, flexible control ability, and broad application prospects

Active Publication Date: 2022-05-31
HUAZHONG UNIV OF SCI & TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects and improvement needs of the DC fault overcurrent problem in the DC system of the prior art and the commutation failure problem caused by the original LCC converter on the inverter side when the AC grid fails, the present invention provides a CCC-PHC type Hybrid cascaded DC converter, rectifier station, inverter station and power transmission system, the purpose is not only to have the large transmission capacity of capacitor commutated converter CCC, but also to have the advantages of flexible PHC control

Method used

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  • ccc-phc hybrid cascade DC converter, rectifier station, inverter station and power transmission system
  • ccc-phc hybrid cascade DC converter, rectifier station, inverter station and power transmission system
  • ccc-phc hybrid cascade DC converter, rectifier station, inverter station and power transmission system

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Embodiment Construction

[0055] The capacitor sub-module includes a bridge structure composed of four thyristors and a capacitor. Among them, four thyristors

[0056] The capacitance-commutated converter CCC consists of two independent CCCs connected in series. The winding methods of the two unit transformers are

[0058] Pre-charge mode: when the system is working normally, when the capacitor voltage is lower than the rated value and the thyristors T1 and T3 are turned on, T2

[0064] The topology of the hybrid parallel converter PHC unit is shown in Figure 4. Each phase of the parallel hybrid converter PHC

[0065] Each half-bridge sub-module consists of two switching devices IGBTs with anti-parallel diodes and a capacitor. open

[0066] The high-voltage switch module HVSS is formed by the series connection of switching devices. The switching devices are all IGBTs.

[0068]v

[0072] V

[0073] MI=2V

[0074] The sub-module SM capacitor is the largest device in the modular multilevel converter. The...

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Abstract

The invention discloses a CCC-PHC hybrid cascaded DC converter, a rectifier station, an inverter station and a power transmission system, belonging to the field of high-voltage DC converters. Including: CCC DC side negative interface is connected to one end of the smoothing reactor, AC side interface is connected to the AC bus through a transformer; the other end of the smoothing reactor is used to connect to the positive pole of the DC power grid; AC busbar connection; PHC, used to provide DC voltage to CCC and transmit active power to CCC under normal working conditions; increase reactive power output of PHC to meet CCC low AC voltage working conditions when a short-circuit fault occurs in the AC grid Under normal working conditions, CCC is used to convert AC into DC and output to the smoothing reactor; when a DC fault occurs in the DC grid, the polarity of the output voltage is changed by CCC to block the fault current . The invention performs cascading through the converter CCC and the PHC, not only has the large transmission capacity of the CCC, but also has the advantage of flexible control of the PHC.

Description

Type CCC‑PHC Hybrid Cascade DC Converters, Rectifier Stations, Inverter Stations and Transmission Systems technical field The invention belongs to the high voltage direct current converter technical field, more specifically, relate to CCC-PHC type hybrid cascade direct current converter converters, rectifier stations, inverter stations and power transmission systems. Background technique The basic structure of capacitor commutated converter (Capacitor Commutated Converter, CCC) is in traditional Several capacitor sub-modules are connected in series on the LCC bridge arm of the converter, and the capacitor voltage is used as an auxiliary for the commutation of the thyristor of the converter valve. Auxiliary commutation voltage. Therefore, the capacitor-commutated converter can improve the power factor of the converter and reduce the reactive power loss, but the converter The existence of the capacitor of CCC increases the insulation level of the converter, and after ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/72H02M1/32
CPCH02M7/72H02M1/32Y02E60/60
Inventor 文劲宇孟沛彧李贤育王志冰向往程帆荆江平姚良忠迟永宁
Owner HUAZHONG UNIV OF SCI & TECH
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