Major power quality improvement for a correctional facility on a weak grid

Segment background

Large facilities located in areas with weak power grids face significant challenges when it comes to harmonic problems. Corrective measures are needed to address the power quality issues and manage reactive power in the electrical system of this kind. It must be noted that with weak grids, harmonic problems can be more pronounced, impacting the performance and effectiveness of the system.

In areas with weak grids, it is essential to collaborate with the local utility provider to address concerns. Engaging in discussions and working closely with the utility company can help identify grid improvement initiatives, such as installations of power quality improvement devices or infrastructure upgrades, which can enhance the overall grid stability and reduce harmonic issues.

Challenges at the customer’s facility

The site presented a complex high-voltage network comprising multiple incoming feeders and multiple generators. Its primary objective was to ensure a secure and reliable power supply under stringent operating conditions, whether operating on a mains supply or generator supply. To achieve this, the deployment of an active harmonic filter was necessary, with specific operational requirements in various modes.

The project’s complexity called for an effective solution that could streamline operations without placing undue burden on the operators. A user-friendly interface was essential, ensuring simplicity and minimizing the potential for operator errors. The aim was to develop a solution that seamlessly integrated into the existing infrastructure and required minimal operator input.

Our Merus® Solution

A pioneering solution, the first of its kind in Australia, was devised to address the power quality challenges at the site. The solution involved the implementation of a large 415 V Merus® A2-Active Harmonic Filter system, uniquely designed to supply reactive power and mitigate harmonics through 22 kV step-up transformers. Essentially the solution is a unique small Merus® STATCOM, static synchronous compensator system.

Control sensing was achieved by utilizing the summation of Current Transformers and Voltage Reference points strategically positioned across the step-down/step-up HV grid. These sensing points were connected to a customized Control Logic Panel, which facilitated telemetry and remote-control capabilities via a Merus® SCADA system.

Segment / Application

Correctional facility



Power quality issue

Weak grid with reactive power and harmonics

Merus® Solution

Customer Benefits

  • Avoiding overheating of the transformer
  • Reduced maintenance costs
  • Longer lifetime of plant equipment
  • Compliance with IEEE519-2014 power quality standards

Results after installation

The successful implementation of the Merus® STATCOM solution not only resolved existing power quality challenges but also enhanced the overall grid performance. The unique combination of the large active harmonic filter system and step-up transformers introduced an innovative approach that set a benchmark for future projects in Australia.

Moreover, the inclusion of control sensing through the summation of Current Transformers and Voltage Reference points proved to be instrumental in monitoring and optimizing the power system. The customized Control Logic Panel facilitated seamless telemetry and remote-control capabilities, enabling efficient management and control of the solution.

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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