Tackling harmonics on a weak grid in a fish processing plant

Segment background

Fish processing plants play a pivotal role in the global seafood industry, transforming harvested fish into various products for consumption. However, the operation of such facilities can introduce a range of power quality challenges due to the non-linear nature of their processing equipment, including the use of Variable Frequency Drives (VFDs). VFDs have been known to cause problems such as harmonic distortion and addressing them within the fish processing environment is essential to maintaining operational efficiency and overall sustainability.

Challenges at the customer’s plant

Our customer operates a fish processing plant that relies on a weak grid, a scenario that has presented unique challenges. Within the facility, they employ several VFDs, essential for controlling the speed of the motors in various processing equipment for the refrigeration and freezing of fresh fish. Unfortunately, these VFDs have been the source of considerable problems, particularly in relation to harmonic distortion. This issue is magnified on a weak grid. Weak grids often struggle with handling harmonic distortions, which can lead to problems such as overheating and voltage instability. The presence of harmonics poses a potential risk to both the facility’s electrical system and its overall operations.

The central goal of the project was to ensure that the facility’s operations remained unaffected by the harmonics generated by the extensive range of processing equipment and electronically controlled machinery. Addressing the potential challenges arising from the weak power grid was also a key consideration.

Our Merus® Solution

The requirement for harmonic mitigation was driven by the supply company, who were aware of existing harmonic levels, and impressed by the ‘zero impact’ solution of Merus® HPQ-Hybrid Power Quality. Designed with adaptable active harmonic filtering, Merus® HPQ targets the reduction of harmonic distortions, thereby enhancing energy efficiency.

In the decision-making process, the expertise and power quality measurement provided by Merus Power’s local partner, Power Capacitors Ltd., played a crucial role. Considering the spatial constraints at the facility, the compact footprint of Merus® HPQ was also a determining factor, ensuring a solution that aligned with both the operational demands and the available space.


Food & Beverage industry,
Fish Processing Plant


United Kingdom

Power quality issue

  • High current harmonic distortion
  • Issues with cost-effectiveness

Merus® Solution

Customer Benefits

  • Improved power quality in the processing plant
  • Reduced downtime and maintenance costs
  • Longer lifetime of sensitive electrical equipment
  • Increased operational efficiency
  • Compliance with local power quality standards

Results after installation

The selected Merus® HPQ provided a versatile toolkit that helped the plant comply with strict power quality standards. The hands-on approach from Power Capacitors Ltd. ensured seamless integration, adapting to the plant’s dynamic operational demands. Through their local engineering expertise, they were able to streamline operations and enhance overall system reliability.

After implementing the Merus® HPQ solution, the Total Harmonic Distortion (THD(i)) decreased from 49.3% to 19.5%, while the Power Factor improved from 0.82 to a near-perfect 0.99.

This combination of cutting-edge technology and engineering expertise delivered significant operational advantages. Refrigeration processes became more efficient, while maintenance demands and costs were lowered, and equipment lifespan increased. The facility experienced enhanced energy efficiency and a reduction in downtime, leading to greater overall productivity.

Do you have any questions?

Please contact one of our salespeople with questions and inquiries.

Riku Kalliomaa

Head of Sales,
Regions & Channels

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

Jaakko Poutamo

Sales Manager,
Energy Storage, Europe

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

Mikko Zavertkin

Sales Manager,
Key Accounts & OEMs

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

Viktoria Mansikkala

Sales Manager,
Baltics & Eastern and Southern Europe

+358 44 9 735 737 viktoria.mansikkala@meruspower.com

Juhani Jaatinen

Senior Sales Manager,
DACH, Benelux, France,

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

Venkatesh Ramachandra

Regional Sales Manager,
Middle East

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