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DC (Direct Current) power transmission system with function of unidirectionally transmitting power

A direct current transmission system and power transmission technology, which is applied in the direction of direct current network circuit devices, power transmission AC networks, electrical components, etc., can solve the problem of high cost and achieve the effect of low cost, cost reduction and capacity reduction

Active Publication Date: 2011-10-19
梁一桥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-cost components of this type of voltage source converter module are: 1) Insulated Gate Bipolar Transistor (IGBT), 2) DC capacitor, and the larger the capacity of the converter, the higher the cost of IGBT and DC capacitor

Method used

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  • DC (Direct Current) power transmission system with function of unidirectionally transmitting power
  • DC (Direct Current) power transmission system with function of unidirectionally transmitting power
  • DC (Direct Current) power transmission system with function of unidirectionally transmitting power

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing, the present invention will be further described:

[0019] A direct current transmission system for unidirectional power transmission, in which a diode rectifier 1, a direct current transmission line 2 with two wires, positive and negative, and a full-power modular multilevel converter are sequentially connected between the sending end system A and the receiving end system B 4, the two ends of the diode rectifier 1 are connected in parallel with a low-power modular multilevel converter 3; the AC end of the diode rectifier 1 is connected to the sending end system A, and the DC end of the diode rectifier 1 is connected to the DC transmission line 2 The sending end is connected; the AC end of the low-power modular multilevel converter 3 is connected to the sending end system A, and the DC end of the low-power modular multilevel converter 3 is connected to the sending end of the DC transmission line 2; The DC end of the full po...

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Abstract

The invention belongs to the technical field of DC (Direct Current) power transmission, particularly a DC power transmission system with a function of unidirectionally transmitting a power. The DC power transmission system is characterized in that both ends of a diode rectifier are connected in parallel with low-power modularized multilevel converters; an AC (Alternate Current) end of the diode rectifier is connected with a sender system; a DC end of the diode rectifier is connected with a sender of a DC power transmission circuit; AC ends of the low-power modularized multilevel converters are connected with the sender system; DC ends of the low-power modularized multilevel converters are connected with the sender of the DC power transmission circuit; a DC end of a full-power modularized multilevel converter is connected with a receiver of the DC power transmission circuit; and an AC end of the full-power modularized multilevel converter is connected with a receiver system. The low-power modularized multilevel converters are used as active power filters to filter out a harmonic current generated by the diode rectifier, provide start power (such as service power) for the sender system when the sender system loses power, provide an AC voltage resource for the sender system.

Description

technical field [0001] The invention belongs to the technical field of direct current transmission, in particular to a direct current transmission system for unidirectional power transmission. Background technique [0002] Since the 1950s, the resurgence of HVDC technology, especially based on the wide application of high-power power electronic devices in DC transmission systems, has brought new development and growth points to the power system. Traditional HVDC transmission uses thyristor-based current source converters, which have been widely used, such as the Zhoushan DC Transmission Project, the Gezhouba-Shanghai DC Transmission Project, and the Xiangjiaba-Shanghai DC Transmission Project. For medium and small power DC transmission applications that require fast power flow control, high power quality, and low environmental impact, and are connected to weak receivers or passive networks, HVDC based on voltage source converters has more advantages. [0003] At present, vo...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J1/00
CPCY02E60/60
Inventor 梁一桥韩其国周月宾
Owner 梁一桥
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