High-voltage broadband pulsating direct current system and method for insulation degradation experiment

By designing a high-voltage wide-band pulsating DC system, multi-frequency harmonic superposition output in the range of 50Hz to 2500Hz is solved, and the problem of difficulty in simulating multi-frequency harmonic superposition in existing equipment is solved, and a comprehensive evaluation of cable insulation performance and the safety and reliability improvement of experiments is achieved.

CN119667394APending Publication Date: 2025-03-21YUNNAN POWER GRID CO LTD
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Patent Information

Application Number
CN202411569438.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-05
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

Existing experimental equipment is difficult to simulate multi-frequency harmonic superposition in the range of 50Hz to 2500Hz, and cannot fully reflect the comprehensive effect of harmonics on the insulation materials of power equipment, limiting the evaluation of cable insulation life and reliability.

Method used

A high-voltage broadband pulsating DC system is designed, including coupling resistors, high-frequency signal generators, amplifiers, transformer groups, high-voltage DC power supplies, protection resistors and coupling capacitors. Through the combination of multiple AC transformer groups and coupling capacitors, a multi-frequency harmonic superimposed output in the range of 50Hz to 2500Hz is achieved.

Benefits of technology

It realizes the harmonic superposition effect under actual power grid conditions in the experimental environment, can comprehensively evaluate the insulation performance of cables and other power equipment, overcomes the limitation that traditional equipment can only generate a single frequency signal, and improves the safety and reliability of the experiment.

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Abstract

The invention discloses a high-voltage broadband pulsating direct current system and method for an insulation degradation experiment, and relates to the technical field of voltage generators, and the method comprises the steps: obtaining three-phase current sampling values of two sides of a doubly-fed wind power plant sending-out line; and judging whether a pilot protection criterion is met or not according to the three-phase current sampling value. According to the system, superposition output of high-frequency harmonic waves and direct-current voltage can be achieved within the frequency range of 50 Hz to 2500 Hz, the limitation that traditional equipment can only generate single-frequency signals is overcome, experiment conditions closer to actual operation working conditions are provided, and comprehensive evaluation of the performance of an insulating material under multi-frequency harmonic waves is facilitated. Through the arrangement of the protection resistor and the coupling resistor, the breakdown risk caused by high-frequency signal superposition in the circuit is effectively controlled, the experiment safety is improved, and the reliability and stability of equipment under the high-voltage condition are ensured.
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