How to solve harmonic currents in modern communication equipment rooms?
Time：
2019-01-05
With the rapid development of the communication industry, the scale of communication power supply systems has also been growing, and power supply equipment has become overly concentrated due to continuous expansion. A certain mobile branch company has used multiple sets of UPS and switch power supply systems. UPS and switch power supplies are typical three-phase nonlinear loads. These nonlinear devices generate a large amount of harmonics during use, leading to distortion in voltage and current waveforms, which severely affects the power supply safety of the machine room. Governance plan: In order to eliminate power supply hazards and improve the safety and reliability of AC power supply in the comprehensive building, based on the on-site conditions.
Project Background:
With the rapid development of the communication industry, the scale of communication power supply systems is also growing, and power supply equipment has become overly concentrated due to continuous expansion. A certain mobile branch company has used multiple sets of UPS and switch power supply systems. UPS and switch power supplies are typical three-phase nonlinear loads. These nonlinear devices generate a large amount of harmonics during use, leading to distortion of voltage and current waveforms, which severely affects the power supply safety of the machine room.
Governance Plan:
In order to eliminate power supply hazards and improve the safety and reliability of AC power supply in the comprehensive building, based on on-site measurement conditions and considering the variety of harmonics generated, it is necessary to use active power filters (active filters can filter out multiple harmonic currents). We evaluated its filtering performance, and the effect was very significant.
Governance Effect:
As can be seen from the figure, the total harmonic content before compensation was 58.2%, and it was reduced to 5.4% after compensation; the 5th harmonic decreased from 50.7% before compensation to 5.4% after compensation; it is evident that after the filter was put into operation, the system harmonics were well suppressed, enhancing the reliability of the power supply system and eliminating the hidden dangers of harmonics affecting the communication system, achieving good results.
Schematic Diagram of Filter Position:
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