Method for double feed-in d.c. power transmission

A DC power transmission, double feed-in technology, applied in the field of power transmission and distribution, can solve the problems of small power transmission capacity, not a power transmission method, and high power transmission cost, so as to improve operation reliability, prevent commutation failure, and reduce the probability of commutation failure. Effect

Active Publication Date: 2008-06-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0007] Although VSC-HVDC has the above advantages, it has the disadvantages of relatively small transmission capacity (the current VSC-HVDC can reach about one-tenth of HVDC in capacity) and relatively high transmission cost, so it is not ideal. Transmission method

Method used

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  • Method for double feed-in d.c. power transmission
  • Method for double feed-in d.c. power transmission

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Embodiment Construction

[0033] Referring to Figure 1, the double-infeed DC transmission method includes a VSC-HVDC subsystem and an HVDC subsystem, and the VSC-HVDC subsystem and the HVDC subsystem are connected in parallel to the same busbar of the AC system or two substations with very close electrical connections. The HVDC subsystem includes: sending end AC system (S 1 ), system impedance (Zs1 ), converter transformer (T s1 ), HVDC converter and transmission line (DC1), converter transformer (T r1 ); VSC-HVDC subsystem includes: sending end AC system (S 2 ), system impedance (Z s2 ), converter transformer (T s2 ), VSC-HVDC converter and transmission line (DC2), converter transformer (T r2 ); the VSC-HVDC subsystem is connected to the same busbar of the AC system at the receiving end of the inverter of the HVDC subsystem, or through the AC transmission line (L 12 ) is connected to the AC system busbar at the receiving end of the inverter of the HVDC subsystem.

[0034] When the VSC-HVDC syste...

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Abstract

The invention provides a dual feed-in DC transmission method, belonging to the distribution technical field. The invention is used for solving the operation reliability of the high-voltage DC transmission. The technical proposal is that an HVDC subsystem and a VSC-HVDC subsystem are connected on the same generatrix of a transmission AC system in parallel or respectively connected with two substations which are very closely connected with each other electrically; the HVDC subsystem consists of an AC system S1 at a sending end, a system resistance Zs1, a converter transformer Ts1, an HVDC converter and a transmission line DC1, and a converter transformer (Tr1); the VSC-HVDC subsystem consists of an AC system S2 at the sending end, a system resistance Zs2, a converter transformer Ts, a VSC-HVDC converter and a transmission line DC2, and a converter transformer (Tr2). Compared with the existing HVDC system, the invention can effectively reduce the possibility that steering failure occurs to the HVDC sub-system inverter, and improves the operation reliability of the HVDC subsystem.

Description

technical field [0001] The invention relates to a high-voltage direct current transmission method, which belongs to the technical field of power transmission and distribution. Background technique [0002] High Voltage Direct Current (HVDC) has been greatly developed in recent years due to its advantages of large transmission capacity, low line cost, and asynchronous operation of the AC grid at both ends of the connection, and has become the most successful application of modern power electronics technology in power systems. One of the application models. However, this power transmission method also has shortcomings, and its operation reliability is affected by the AC power grid at both ends. This is because HVDC converters generally use ordinary thyristors without self-shutoff capability as commutation elements, so when HVDC is running The AC system needs to provide commutation current, which is actually the short-circuit current between phases. When the AC power grid fail...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/36
CPCY02E60/60
Inventor 赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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