Single-core power cable resonance analysis method based on finite element simulation and equivalent circuit

A single-core power cable, equivalent circuit technology, applied in electrical digital data processing, instruments, calculations, etc., can solve the problem of less research on high-frequency harmonic resonance problems

Active Publication Date: 2016-01-13
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Application Information

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Problems solved by technology

There are few studies on the high-frequency harmonic resonance that may occur...

Method used

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  • Single-core power cable resonance analysis method based on finite element simulation and equivalent circuit
  • Single-core power cable resonance analysis method based on finite element simulation and equivalent circuit
  • Single-core power cable resonance analysis method based on finite element simulation and equivalent circuit

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Embodiment Construction

[0035] Such as figure 1 As shown, the single-core power cable resonance analysis method based on finite element simulation and equivalent circuit of the present invention includes the following steps in turn:

[0036] A. Within the harmonic frequency range of power system power frequency 50Hz to 5000Hz, a set of frequency values ​​are preset from small to large, and the distribution parameters of single-core power cables at each frequency are calculated. Single-core power cables include core wires And the metal sheath set on the outside of the core wire, the distribution parameters include the resistance per unit length of the core wire, the inductance per unit length of the core wire, the resistance per unit length of the metal sheath, the self-inductance per unit length of the metal sheath and the core wire to metal Capacitance per unit length of the sheath; In this embodiment, 9 groups of frequencies are selected from the power frequency of 50 Hz to 50000 Hz, and the select...

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Abstract

The present invention discloses a single-core power cable resonance analysis method based on finite element simulation and an equivalent circuit. The method comprises: using finite element simulation to accurately calculate resistance of per unit length of a core wire of a single-core power cable, inductance of per unit length of the core wire of the single-core power cable, resistance of per unit length of a metal protective layer of the single-core power cable, inductance of per unit length of the metal protective layer of the single-core power cable, and capacitance of per unit length of the core wire to the metal protective layer; and using circuit simulation to simulate and analyze resonant circumstances of the core wire and the metal protective layer of the single-core power cable as well as a ground system under different grounding modes. The method is used in the field of power single-core power cable resonance analysis; and an analysis object is determined, analysis steps are simplified, and required resonant circumstances of any failure point can be provided, so that the method has relatively large reference value and significance for diagnosing and predicting a single-core power cable resonance failure.

Description

technical field [0001] The invention relates to the technical field of state monitoring of power system equipment, in particular to a single-core power cable resonance analysis method based on finite element simulation and equivalent circuit. Background technique [0002] As an important part of the power system, single-core power cables occupy a very important position in the power grid. The harmonic problems of single-core power cables are becoming increasingly prominent in the current power system. The structure of the single-core power cable makes it have certain distributed parameters, such as distributed inductance and distributed capacitance. In the case of power frequency, the influence of distributed parameters on the normal operation of single-core power cables can be ignored, but when the higher-frequency harmonics occupy a certain component, local resonance overvoltage and resonance may be formed in single-core power cables. Overcurrent will affect the normal op...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 刘书铭李琼林赵通王振东代双寅杜志叶阮江军
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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