Ensuring stable operation of a commercial high-rise building

Challenges at the customer’s building

This site was a commercial high-rise building in Australia where the customer was having issues with elevators not operating efficiently. The load consisted of multiple VFD-controlled high-rise elevators. The site had a conventional capacitor bank, but it couldn’t keep up with the fast-fluctuating elevator loads, which created more problems for the overall power quality of the whole network.

VFD-controlled elevator loads can cause a high amount of harmonic currents and these currents generate harmonic voltages when flowing through system impedances, which in turn drive those harmonic currents to the conventional linear loads of the system. This can cause pollution of the whole electric power system if harmonic currents generated by non-linear loads are not mitigated properly. Total Harmonic Distortion (THDi) in the network was measured to be in the order of 30%.

Our Merus® Solution

Ampcontrol, our local partner in Australia, carried out an investigation and power recordings and offered the client a Merus® HPQ -system, combining detuned thyristor-switched capacitor banks and IGBT-modules, to help stabilize the elevator loads and improve the power quality of the building. Merus® HPQ is an economic combination of stepped and dynamic compensation, offering fast and reliable reactive power compensation, harmonic mitigation, and phase current balancing.

Results after installation

By installing a Merus® HPQ to the site, the THDi was reduced to a targeted 5% on average, and the power factor was improved to 0.98. The installation of the Merus® HPQ was done with minimal disruption to the building’s daily operations, ensuring that tenants and customers could continue their activities with minimal interruption. Merus® HPQ solution significantly decreases the risk of interruptions caused by the nuisance of relay tripping and power system equipment failures. This state-of-the-art solution addresses multiple power quality issues, resulting in cost savings and increased efficiency.


Commercial building, high-rise with Variable Frequency Drive-controlled elevator loads



Power quality issue

  • High current harmonic distortion

Merus® Solution

Customer Benefits

  • Stable and safe operation of elevators
  • Compliance with the supply authority regulations
  • Increased electrical equipment lifetime
  • Increased efficiency
  • Cost savings

Do you have any questions?

Please contact one of our salespeople with questions and inquiries.

Markus Ovaskainen


+358 40 539 2145 markus.ovaskainen@meruspower.com

Riku Kalliomaa

Senior Sales Manager,
Products, North America

+358 50 3323 020 riku.kalliomaa@meruspower.com

Jaakko Poutamo

Sales Manager,
Central & Southern Europe

+358 50 918 0012 jaakko.poutamo@meruspower.com

Mikko Zavertkin

Sales Manager,
Northern Europe & Central Asia

+358 40 5908 858 mikko.zavertkin@meruspower.com

Viktoriya Riyaka

Sales Manager,
Eastern Europe & Balkans

+358 44 9 735 737 viktoriya.riyaka@meruspower.com

Juhani Jaatinen

Senior Sales Manager,
DACH, Benelux, France

+49 160 762 4909 (DE) juhani.jaatinen@meruspower.com

Pedro Esteban


+65 9155 4225 pedro.esteban@meruspower.com

Venkatesh Ramachandra

Regional Sales Manager,
Middle East

+971 50 55 38 465 venkatesh.ramachandra@meruspower.com
Back to top