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.
Client:
Dairy Processing Plant
Location:
Ireland
Premium Power Role:
Power Quality Consultants
Project Description
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.
Project Challenges
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.
Project Outcomes
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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