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HVDC converter with neutral-point connected zero-sequence dump resistor

A converter and series connection technology, applied in the field of power electronic converters, can solve the problems of increasing the energy transfer resistor 18, the hardware size of the converter, the increase in weight and cost, etc., and achieve the simplification of operation procedures and control schemes, weight and Cost reduction, cost reduction effect

Inactive Publication Date: 2013-07-03
ALSTOM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To obtain the desired rated voltage, it may be necessary to increase the size and weight of the dump resistor 18 and / or the number of IGBTs 20, resulting in an overall increase in converter hardware size, weight and cost

Method used

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  • HVDC converter with neutral-point connected zero-sequence dump resistor
  • HVDC converter with neutral-point connected zero-sequence dump resistor
  • HVDC converter with neutral-point connected zero-sequence dump resistor

Examples

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Embodiment Construction

[0045] image 3 A power electronic converter 30 according to one embodiment of the invention is shown.

[0046] The power electronic converter 30 includes three phase elements 32 and a converter unit 34 .

[0047] Each phase element 32 includes a transformer winding. The three phase elements 32 define a first star connection 36 in which a first end 38 of each phase element 32 is connected to a common node 40 of the first star connection 36 . The first star connection 36 defines the secondary side of the transformer, wherein each transformer winding of the first star connection 36 is mutually coupled with a corresponding primary winding 42 at the primary side 42 of the transformer, each primary winding via a line inductor 46 are connected to the respective phases of the three-phase AC network 44 . This enables each phase element 32 to be associated in use with a corresponding phase in the three-phase AC network 44 . The primary winding 42 at the primary side of the transfor...

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Abstract

A power electronic converter(30)is for use in high voltage direct current power transmission and reactive power compensation, the power electronic converter (30) including three phase elements (32) defining a star connection (36) and a converter unit (34) including first and second DC terminals (50,52) for connection in use to a DC network (56) and three AC terminals (54), the converter unit (34) including a plurality of switching elements (70,74) controllable in use to facilitate power conversion between the AC and DC networks (44,56), the power electronic converter (30) further including a third DC terminal(78) connected between the first and second DC terminals (50,52), the third DC terminal (78) being connected to a common junction (40) of the star connection (36) to define an auxiliary connection (82), the auxiliary connection (82)including at least one dump resistor (84); connected between the common junction (40) and the third DC terminal (78), wherein the switching elements (70,74) of the converter unit (34) are controllable in use to modify a phase voltage at each AC terminal (54) to include a triplen harmonic voltage component so as to dissipate real power in the or each dump resistor (84) at a triplen harmonic frequency.

Description

technical field [0001] The invention relates to a power electronic converter used for high voltage direct current power transmission and reactive power compensation. Background technique [0002] In power transmission networks, alternating current (AC) power is usually converted to direct current (DC) power for transmission via overhead lines and / or submarine cables. This transformation eliminates the need to compensate for the effects of AC capacitive loading introduced by the transmission line or cable, thereby reducing the cost per kilometer of the line and / or cable. Therefore, AC to DC conversion can be cost effective when power needs to be transmitted over long distances. [0003] AC to DC power conversion is also used in power transmission networks that need to interconnect AC networks operating at different frequencies. [0004] In any such power transmission network, each interface between AC and DC power requires a converter 10 to achieve the required conversion, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02M1/32
CPCH02J3/1857H02M1/32H02M7/49H02M7/797Y02E60/60H02J3/36Y02E40/20H02M7/4835H02M1/0095H02M1/12H02M7/493
Inventor 戴维·雷金纳德·特雷纳纳姆迪·奥卡密
Owner ALSTOM TECH LTD
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