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Harmonics Mitigation Services
Over thirty-five years ago, almost all loads were linear, with the current waveform closely matching the sinusoidal source voltage waveform and changing in proportion with the load. In recent years, the use of non-linear loads has increased dramatically. A non-linear load changes the sinusoidal nature of the AC power current thereby resulting in the flow of harmonic currents in the AC power system that can cause interference with communications circuits and other types of equipment. Any load that draws a non-sinusoidal current wave when supplied by a sinusoidal voltage source is classified as a non-linear load.
Any DC load that has a low time constant (low inductance), such as a DC motor, does not draw ripple-free current. The harmonics in the voltage wave produce significant ripple currents in the DC current wave. The harmonics are related to the pulse number of the converter circuit: six-pulse generates 6th harmonic ripple and 12-pulse generates 12th harmonic ripple.
The emergence of renewable, alternate energy sources has resulted in the use of many varied topologies as power conditioners or inverters for utility tied operations. Inverters are available in single-phase and three-phase units and their outputs may be very clean sinusoids with near unity power factor or may contain various characteristic and non-characteristic harmonics and power factors that may cause unacceptable power quality on the electric utility grid.
Our Services:
- Power Quality Survey
- Parallel Resonant Frequency Analysis
- Fundamental Frequency Analysis
- Harmonic Load Flow Analysis
- Equipment Bid Specifications