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Hybrid pseudo-bipolar direct-current transmission method for supplying power to passive network and weak alternating-current network

A technology of AC network and passive network, applied in the field of hybrid pseudo-bipolar DC power transmission, can solve the problems of inability to supply power from passive network and weak AC network, small power transmission capacity and high power transmission cost

Inactive Publication Date: 2014-06-11
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that in the existing direct current transmission system, CSC-HVDC cannot supply power to passive network and weak AC network; VSC can supply power to passive network and weak AC network, but the transmission cost is high and the transmission capacity is small. To provide a hybrid pseudo-bipolar direct current transmission method for supplying power to passive networks and weak AC networks

Method used

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  • Hybrid pseudo-bipolar direct-current transmission method for supplying power to passive network and weak alternating-current network
  • Hybrid pseudo-bipolar direct-current transmission method for supplying power to passive network and weak alternating-current network
  • Hybrid pseudo-bipolar direct-current transmission method for supplying power to passive network and weak alternating-current network

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Embodiment

[0054] like figure 1 As shown, the equivalent AC system S at the sending end 1 with an equivalent system impedance Z s1 connected, then through two transformers T s1 and T s2 They are respectively connected to 6-pulse current source converters I and II, connected to a 6-pulse voltage source converter III through a DC transmission line, and through a transformer T r Connect with passive network. Two DC capacitors C on the DC side 1 and C 2 Connect in parallel to the positive and negative poles of the DC line after series connection.

[0055] like figure 2 As shown, the voltage source converter VSC on the inverter side has a three-phase two-level topology. The converter valve I and the converter valve IV are connected in series to form a valve bridge arm, the converter valve III and the converter valve VI are connected in series to form a valve bridge arm, the converter valve V and the converter valve II are connected in series to form a valve bridge arm, and then three...

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Abstract

The invention discloses a hybrid pseudo-bipolar direct-current transmission method for supplying power to a passive network and a weak alternating-current network. The method is characterized in that two six-pulse current source converters are adopted in the rectification side, a six-pulse voltage source converter is adopted in the inversion side, and then a pseudo-bipolar direct-current transmission system is established. A constant-current control mode is adopted in the rectification side, a constant-alternating-current voltage-direct-current voltage control mode is adopted in the inversion side, stable power transmission is achieved, the voltage stability of a receiving system is guaranteed as well, and therefore it is made possible that the power is supplied to the passive network and the weak alternating-current network through the novel direct-current transmission system. Compared with a flexible direct-current transmission method, power transmission cost is reduced; compared with a traditional direct-current transmission method, the power can be supplied to the passive network; the novel direct current-transmission system has high transient stability.

Description

technical field [0001] The invention relates to a hybrid pseudo-bipolar direct current transmission method for supplying power to a passive network and a weak alternating current network, belonging to the field of high-voltage direct current transmission. Background technique [0002] HVDC systems can be divided into two types: all converter stations are composed of traditional thyristor-based current source converters (CSC-HVDC); all converter stations are based on fully controlled element voltage source converters DC transmission system (VSC-HVDC) composed of inverters. At present, almost all the DC transmission systems in operation in the world are CSC-HVDC systems. However, due to the use of current source converters composed of thyristors, the AC side system must have a certain strength system. When one end is connected to a weak AC system, It will greatly affect the operating characteristics of the entire DC system. In recent years, the VSC-HVDC power transmission sy...

Claims

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Application Information

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IPC IPC(8): H02J1/00H02J3/36
CPCY02E60/60
Inventor 李兴源印永华李宽孙栩王渝红刘天琪
Owner STATE GRID CORP OF CHINA
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