Meeting current and voltage distortion limits in a district cooling plant

Challenges at the customer’s building

Power requirements were met by 11 diesel generating sets each of 1.6 MW at the customer’s residential complex. The main loads in the district cooling plant are centrifugal and absorption chillers, as well as pumping stations along with a sewage and water treatment plant. The loads are mainly fed by AC drives.

The short-circuit level was low at the district cooling plant, e.g., 11 KA on a 13.8 kV bus. The AC drives were a source of high harmonic currents which eventually result in higher RMS currents. Upon commissioning of the project, a number of tripping of the generation sets was observed at the facility. High harmonic distortions at the plant also resulted in the failure of one diesel-generating set. The maintenance manager also complained about frequent instrument breakdowns.

Our Merus® Solution

Based on the loads in the facilities, Merus Power’s technical team performed a simulation and proposed 1000 A of harmonic compensation altogether. Merus Power offered 5 sets of 200 A Merus® A-series Active Harmonic Filters.

These filters were installed in parallel to the loads on two separate busbars. They were configured to the operation mode where all the harmonics in the system up to the 50th order were being mitigated.

Results after installation

Harmonic cancellation response created by IGBT-based power electronic technology has proven to be very effective and brought elevated harmonic distortion levels below the maximum limits specified by IEEE 519 power quality standards. Individual harmonics which were quite high earlier are now negligible at the residential complex.

Tripping of the diesel generating sets has completely stopped with no further diesel generating sets failure. No further complaints about the unexplained instrument failure were given. The residential complex enjoys maximum availability and reliability and provides premium customer experience.

Segment / Application

HVAC – District cooling plant with AC drives


Middle East

Power quality issue

  • High current harmonic distortion

Merus® Solution

Customer Benefits

  • No more tripping of diesel-generating sets
  • Seamless customer experience at the residential complex
  • No excessive overheating
  • No damage to the electrical components and gensets
  • Compliance with power quality standard

Do you have any questions?

Please contact one of our salespeople with questions and inquiries.

Markus Ovaskainen


+358 40 539 2145

Riku Kalliomaa

Head of Sales,
Regions & Channels

+358 50 3323 020

Jaakko Poutamo

Sales Manager,
Energy Storage, Europe

+358 50 918 0012

Mikko Zavertkin

Sales Manager,
Key Accounts & OEMs

+358 40 5908 858

Viktoria Mansikkala

Sales Manager,
Baltics & Eastern and Southern Europe

+358 44 9 735 737

Juhani Jaatinen

Senior Sales Manager,
DACH, Benelux, France,

+49 160 762 4909 (DE)

Venkatesh Ramachandra

Regional Sales Manager,
Middle East

+971 50 55 38 465
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