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Resonance mitigation system and method

A resonant frequency, harmonic distortion technology, applied in AC network to reduce harmonics/ripple, AC network circuits, electrical components, etc., can solve problems such as increased cost and additional space requirements

Inactive Publication Date: 2010-06-16
GENERAL ELECTRIC CO
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, active filters have the disadvantage of additional space requirements and increased cost

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  • Resonance mitigation system and method

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Embodiment Construction

[0023] Ideally, a three-phase alternating current (AC) power source, as used in most industrial environments, utilizes three electrical power conductors, each of which provides a perfect sine wave of current and voltage, the sine wave having an equal and constant Amplitude and frequency, and each phase is separated from the others by a phase angle of 120 degrees.

[0024] With the increasing use of solid-state power electronic devices (which have non-linear load characteristics, such as motor controllers with switching triacs that quickly connect and disconnect large loads), the three-phase The power may become distorted. Such distortion is characterized by introducing harmonics into the fundamental frequency of AC power. Harmonics cause energy loss in the motor and may affect the efficiency and stability of the power supply in sensitive electronic equipment. Harmonics can also cause resonance to cause unnecessary voltage spikes. For this reason, many countries have establishe...

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Abstract

The present inveniton relates to resonance mitigation system and method. A system for reducing resonance from harmonic distortion in a high voltage power system is presented. The system includes a voltage damper coupled to the high voltage power system between a cable sheath and an earth connection. The voltage damper is configured to clamp voltage peaks. The system also includes a frequency shifter coupled across the voltage damper and configured to displace a resonance frequency of the high voltage power system.

Description

Technical field [0001] The present invention relates generally to resonance in high-voltage power systems, and particularly to systems and methods for mitigating resonance from harmonic distortion. Background technique [0002] Conversion of alternating current (AC) power to direct current (DC) power and conversion of direct current (DC) power to alternating current (AC) power may include circuits such as passive input and output filtering with significant harmonic distortion that generates AC current waveforms Rectifier network of the converter. Harmonic distortion usually causes undesirable power consumption and generates useless electromagnetic interference, which is coupled into other lines and equipment. Distorted AC current waveforms may also excite undesirable vibrations in transformers and rotating machinery in which electromagnetic coupling is achieved. In addition, the input power factor is often adversely affected, resulting in a decrease in work efficiency. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02H7/228H02H9/005Y02E40/30H02J3/18H02J3/00125H02H7/26H02J3/01
Inventor C·M·西勒E·V·拉森A·S·阿希莱斯
Owner GENERAL ELECTRIC CO