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Method and arrangement to reverse the power flow of a direct current power transmission system

A technology of DC current and power flow, applied in the direction of power transmission AC network, output power conversion device, conversion of AC power input to DC power output, etc., can solve the problems of reducing reactive power consumption and increasing reactive power generation

Active Publication Date: 2010-02-10
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Operation at low DC currents is unfavorable because it leads to a reduction in reactive power consumption in the converter, which leads to an increase in reactive power generation in the AC system

Method used

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  • Method and arrangement to reverse the power flow of a direct current power transmission system
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  • Method and arrangement to reverse the power flow of a direct current power transmission system

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Embodiment Construction

[0039] figure 1 The DC transmission system is shown in , which includes the first converter station S 1 and the second converter station S 2 . Converter station S 1 and S 2 They are connected to each other via a DC line 1 . The direct current transmission system is used in the first alternating current power system AC 1 with the second AC power system AC 2 Active power P is transferred between them.

[0040] Converter station S 1 and S 2 Each converter station in includes a line-commutated converter 11 or 12, a transformer 21 or 22 with an on-load tap changer and in this example an AC filter 31 and 32 for reactive power consumption components. The inverter 11 and the first inverter station S are controlled via the first control unit 41 1 operation of the tap changer. The inverter 12 and the second inverter station S are controlled via the second control unit 42 2 operation of the tap changer. The first control unit 41 and the second control unit 42 respectively r...

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PUM

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Abstract

A direct current power transmission system comprises a first (S1) and a second (S2) converter station which are coupled to each other via a direct current link (1). Each converter station comprises afirst (11) or second (12) line commutated converter, respectively. Before power reversal the first converter (11) is operated as rectifier and the direct current (lDC) is controlled in the first station (S1), while the second converter (12) is operated as inverter and in the second station (S2) the extinction angle (gamma 2) of the second converter (12) or the direct voltage (UDC) is controlled. After power reversal, the first converter (11) is operated as inverter and the second converter (12) as rectifier. During power reversal a change is carried out in the first station (S1) from control of the direct current (IDC) to control of the extinction angle (Y1) of the first converter (11) or to control of the direct voltage (UDC), which is performed in synchronization with a change in the second station (S2) from control of the extinction angle (gamma 2) of the second converter (12) or from control of the direct voltage (UDC) to control of the direct current (lDC).

Description

technical field [0001] The invention relates to a method and a device for reversing the power flow between a first converter station and a second converter station connected to each other via a direct current line, wherein each converter station respectively comprises a first line commutation Converter (Line commutated converter) or second line commutated converter. Operate the first station as a rectifier and control the DC current in the line in the first station and operate the second station as an inverter and control its shutdown in the second station before the power is reversed horn. After power reversal, the first station is operated as an inverter and the second station as a rectifier. The apparatus includes a first control unit in the first station and a second control unit in the second station for performing the power inversion method. Background technique [0002] Today DC transmission systems are used to interconnect AC power systems and transmit power at hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/757H02J3/36
CPCH02J3/36Y02E60/60H02M7/7575
Inventor 乌尔夫·拉德布兰特
Owner HITACHI ENERGY SWITZERLAND AG