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Parameter design method of direct current side main loop of flexible direct current system containing superconducting direct current limiter

A flexible DC and parameter design technology, applied in the fields of instrumentation, calculation, electrical and digital data processing, etc., can solve the problem of no design principles given in the literature, avoid time-domain simulation calculation, improve calculation efficiency, and reduce time spent. Effect

Active Publication Date: 2018-11-16
NANJING ELECTRIC POWER ENG DESIGN +3
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Problems solved by technology

[0007] The DC side main circuit parameter design of the flexible DC system is an important part of the entire DC system design. For a flexible DC system containing a superconducting DC current limiter, the main content of the DC side main circuit parameter design becomes The parameters of the superconducting DC current limiter and the DC circuit breaker are matched, but there is no corresponding design principle in the literature

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  • Parameter design method of direct current side main loop of flexible direct current system containing superconducting direct current limiter
  • Parameter design method of direct current side main loop of flexible direct current system containing superconducting direct current limiter
  • Parameter design method of direct current side main loop of flexible direct current system containing superconducting direct current limiter

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[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 flexible direct current transmission system in this embodiment is as follows figure 1 As shown, it is assumed that the current limiting resistance of the superconducting current limiter after the fault is in accordance with R sup = R max (1-e -t / t0 ) regular change, t 0 Take it as 1ms, and the rest of the system parameters are shown in Table 1:

[0049] Table 1

[0050]

[0051] Such as image 3 As shown, the main circuit parameters of the DC side of the flexible DC system containing the superconducting DC current limiter are designed by the following method (taking the MMC2 side as an example):

[0052] (1) According to the system design requirements, respectively determine the short-circuit current of the DC side of the flexible DC s...

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Abstract

The invention discloses a parameter design method of a direct current side main loop of a flexible direct current system containing a superconducting direct current limiter, which comprises the following steps of: (1) determining a short circuit current peak value, a lightning arrester branch access moment and a most severe working condition; (2) calculating the relationship between the smoothingreactance and the short circuit current peak value; (3) solving the magnitude of the smoothing reactance; (4) solving the magnitude of the current limiting resistor. The parameter design method of thedirect current side main loop can fill the blank of the design research of the direct current main loop containing the superconducting current limiter and can play a certain guiding role for the design of the future engineering; the calculation formula of the short circuit current based on the recursion method can improve the calculation efficiency, avoid the time-consuming time domain simulationcalculation and reduce the time spent by the design of the direct current main loop under the premise of ensuring the effectiveness.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution in electric power systems, and in particular relates to a method for designing the parameters of a main circuit on the DC side of a flexible DC system containing a superconducting DC current limiter. Background technique [0002] In recent years, with the development of power electronics technology, the flexible DC transmission technology using Modular Multilevel Converter (MMC) has developed rapidly, and the voltage level and rated power are close to the traditional DC transmission technology. The most important technical bottleneck of the technology is the fast isolation technology for DC faults. In general, the difficulties in dealing with DC faults in the flexible DC transmission system are mainly manifested in the following aspects: [0003] (1) The short-circuit current rises quickly, and generally the short-circuit current can rise to the peak value within 10ms ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/398
Inventor 韩笑孙建龙李妍黄俊辉何大瑞徐政张哲任徐雨哲
Owner NANJING ELECTRIC POWER ENG DESIGN
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