Rapid calculation method of high-voltage/extra-high voltage direct current (DC) transmission line fault voltage traveling wave

A DC line fault, UHV DC technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as low calculation efficiency and difficulty in applying calculation efficiency, achieve strong practicability, ensure calculation accuracy, and improve calculation efficiency effect

Inactive Publication Date: 2015-02-18
STATE GRID NINGXIA ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the detailed electromagnetic transient simulation method can simulate the fault traveling wave process of the high-voltage DC line fault in detail, when the traditional numerical simulation is applied to the research of traveling wave protection of the DC system, there are only data at discrete time nodes, and the calculation efficiency is high when the sampling frequency is high. It is difficult to apply to occasions that have high requirements for computational efficiency, so it is necessary to propose a new method to improve computational efficiency while ensuring computational accuracy

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  • Rapid calculation method of high-voltage/extra-high voltage direct current (DC) transmission line fault voltage traveling wave
  • Rapid calculation method of high-voltage/extra-high voltage direct current (DC) transmission line fault voltage traveling wave
  • Rapid calculation method of high-voltage/extra-high voltage direct current (DC) transmission line fault voltage traveling wave

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Embodiment

[0031] Combine below figure 1 Specifically explaining the embodiment of the present invention, the fast calculation method for the fault voltage traveling wave of the DC line taking into account the frequency-dependent characteristics of the HV / UHV DC network includes the following steps:

[0032] (1) According to the network topology of the DC system and the fault conditions of the DC line, the injection current I of the fault point in the phase-frequency domain is obtained f And system node voltage equation;

[0033] (2) From the node voltage equation in step (1), within the user-defined frequency range Ω, obtain several sampling values ​​of the mutual impedance between the DC line end and the fault point, that is, the frequency domain response F(Ω);

[0034] (3) Divide the frequency response obtained in step (2) into N sections along the F(Ω) frequency axis, and give the initial range of the order on each frequency section [N mink ,N maxk ];

[0035] (4) The frequency r...

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Abstract

The invention discloses a rapid calculation method of a high-voltage / extra-high voltage direct current (DC) transmission line fault voltage traveling wave. The method comprises the following steps: acquiring phase-frequency domain fault point injection current I<f> and a system node voltage equation; acquiring a plurality of sampling values of mutual impedance between a DC transmission line side and a fault point; dividing the obtained frequency response into N sections along the F (omega) frequency axis, and setting the initial ranges of orders of all frequency bands to be (N<mink>, N<maxk>); calculating the error function E<k>=F(omega<k>)-F<*(k+1)> (omega<k>) generated by a fitting function F<*(k+1)> with the order of N in the section, and taking E<k> as a fitting object of a VF method at the kth section; when k is equal to 1, stopping the calculation, and outputting a final fitting result when the F<*(1)> with the order of N is taken as the frequency to respond F (omega); obtaining a frequency domain equation of a transient voltage traveling wave U of the transmission line side; realizing frequent-time domain conversion by pull inverse transformation, and acquiring the time domain expression u(t). After the method is adopted, scientific calculation basis is provided for analysis, rapid calculation, protection evaluation and the like of DC transmission line faults of a high-voltage / extra-high voltage DC system; the method is very high in practicality during engineering practice.

Description

technical field [0001] The invention relates to the research field of power system fault calculation methods, in particular to a fast traveling wave calculation method for fault voltage of a high-voltage / ultra-high voltage DC line. Background technique [0002] Traveling wave protection is the main protection of DC line. Accurate calculation of electromagnetic transient electrical quantities related to DC line fault traveling wave protection is the basis for correct analysis of the action behavior of traveling wave protection. Due to the complexity of the topology of the DC system itself and the faults of the DC line, the existing fault analysis is often completed by electromagnetic transient simulation software. Although the detailed electromagnetic transient simulation method can simulate the fault traveling wave process of the high-voltage DC line fault in detail, when the traditional numerical simulation is applied to the research of traveling wave protection of the DC s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 王小立刘志远罗美玲郭敬梅李海锋王钢
Owner STATE GRID NINGXIA ELECTRIC POWER CO
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