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Calculation method for direct-current loop impedance of hybrid bipolar direct-current transmission system

A technology of direct current transmission system and direct current transmission line, applied in calculation, electrical digital data processing, power transmission AC network, etc., can solve the problem that time domain simulation technology is not suitable for DC circuit impedance calculation, consumes a lot of calculation time and calculation resources, etc. question

Inactive Publication Date: 2013-12-04
ZHEJIANG UNIV
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Problems solved by technology

[0009] Although time-domain simulation technology can be used to calculate the DC link impedance of the system, time-domain simulation requires a lot of computing time and resources; considering that there are various wiring methods and power levels in actual engineering, time-domain simulation technology does not Not very suitable for calculation of DC link impedance

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  • Calculation method for direct-current loop impedance of hybrid bipolar direct-current transmission system
  • Calculation method for direct-current loop impedance of hybrid bipolar direct-current transmission system
  • Calculation method for direct-current loop impedance of hybrid bipolar direct-current transmission system

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Embodiment Construction

[0047] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] The hybrid bipolar direct current transmission system in this embodiment is as follows: figure 1 As shown, its system parameters are shown in Table 1; where the DC filter DCF configuration is as follows figure 2 As shown, its parameters are shown in Table 2:

[0049] Table 1

[0050]

[0051]

[0052] Table 2

[0053]

[0054] Such as image 3 As shown, the calculation method of the DC link impedance of the hybrid bipolar DC transmission system in this embodiment includes the following steps:

[0055] (1) According to the main circuit parameters of the system and the operating conditions of the system, the LCC and MMC in the system are equivalently converted to obtain the equivalent internal inductance corresponding to LCC and the equ...

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Abstract

The invention discloses a calculation method for direct-current loop impedance of a hybrid bipolar direct-current transmission system. The calculation method includes the steps: (1) calculating internal inductance of an LCC (line-commutated converter) on a rectifier side and an equivalent passive circuit parameter of an MMC (modular multilevel converter) on an inverter side; (2) calculating an admittance matrix of a whole direct-current line; (3) solving an equation of a direct-current network to obtain voltage of a few key nodes of the direct-current network; (4) solving the direct-current loop impedance. The calculation method for the direct-current loop impedance can make up design and research blanks of a direct-current main loop of an existing hybrid bipolar direct-current transmission system and achieve a certain guiding function for the design of future engineering, in view of the fact that time-domain simulation consumes time and calculation resources, the calculation method for the direct-current loop impedance is based on an equivalent analytical method on the premise of ensuring effectiveness, and calculation efficiency can be improved, so that time consumed by the design of the direct-current main loop can be shortened.

Description

technical field [0001] The invention belongs to the technical field of electric power system transmission, and in particular relates to a method for calculating the direct current loop impedance of a hybrid bipolar direct current transmission system. Background technique [0002] One of the main problems in the application of flexible DC transmission to long-distance large-capacity overhead line transmission is the self-clearing problem of DC side faults. Since there is no real commercial application of high-voltage large-capacity DC circuit breakers, the flexible DC transmission system will The method of jumping the AC side switch is used to clear the DC side fault. According to ABB’s experience in the Caprivi Link project, this method takes 2-2.5s from the beginning of the fault to clearing the fault and returning to the power level before the fault, which is still a gap of about 0.5s compared with the traditional DC transmission processing similar fault time . For this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36G06F19/00
CPCY02E60/60
Inventor 徐政张哲任薛英林唐庚刘昇
Owner ZHEJIANG UNIV
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