Hybrid Solutions to Harmonic Issues
This newly commissioned facility built on a green field site was experiencing some reliability issues and unplanned outages at various locations across the electrical network. The energy efficient design had a high quantity of variable speed drives installed and the client was aware that an elevated level of harmonic currents and voltage was being constantly recorded throughout the plant.
Dairy Processing Plant
Premium Power Role:
Power Quality Consultants
Our power quality and harmonic assessment highlighted significant breaches of the voltage harmonic limits as stipulated by the IEC 61000-2-4 standard. This together with harmonics introduce a ripple (distortion) on the voltage waveform resulting in multiple zero crossings. We then modelled their electrical system to size a filtering solution that would mitigate the issues found.
It was identified that abnormal harmonic levels would have a negative impact on the performance of the facility. A full evaluation was required to ensure that the electrical distribution network would function as required and could reliably support the new milk processing production equipment.
A hybrid solution, composing of Active Harmonic Filters (AHF) and Passive Harmonic Filters (PHF) was recommended for a number of locations. A staged mitigation plan for filter installation matching ramp up of production allowed specific solutions exactly matching the issues at each location. This way a greater reduction in Voltage THD was achieved, preventing future failures of critical devices, reducing the energy losses due to excessive currents and extending lifespan of mission critical power equipment.
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