Ship Technology is using cookies

We use them to give you the best experience. If you continue using our website, we'll assume that you are happy to receive all cookies on this website.

ContinueLearn More X

Comsys Active Harmonic Filters and Power Quality Systems

Comsys is a leading provider of reliable power quality systems for the maritime and offshore industries. Through improved power quality, we help our clients to improve the safety of their vessel and reduce the environmental impact of their operations.

We can assist in each stage of the process from design to installation, including surveys, commissioning and training of the crew. Using our wide knowledge and experience, we aid our clients in complying with current and future regulations, whilst at the same time improving their productivity, saving fuel and reducing the cost of their electrical power infrastructure.

Power and harmonics

Harmonics cause nuisance tripping, equipment failure, navigation errors and increased fuel consumption.

For these reasons, class notations set limits on harmonics. A ship or rig has a weak grid translating into a much more sensitive power system. Power disturbances affect operational safety and energy consumption. Older mitigation solutions generate relatively high power losses directly translating into high fuel consumption, managing to only solve the problem locally on individual equipment. Using Comsys’ Active Dynamic Filters (ADF), the vessel can handle a large amount of variable loads compensated through central active filtering.

Ensuring good power quality onboard the vessel secures a safer and more productive operation.

Active dynamic filters

The Comsys ADF is an active filter that can be placed anywhere on the main busbar. It will keep the THD level on the busbar within the class notation limits. This allows the rest of the system to be designed using only very reliable six-pulse VFD loads, saving size, weight and complexity. No heavy phase shifting transformers or unstable front end inverters are required onboard. By filtering the loads through the main busbar, all systems, including auxiliaries, are taken care of independently of each other.

The ADF active design can not be overloaded and allows remote monitoring and logging of the power quality status onboard.

Space-saving active filters

The ADF’s footprint can be up to 75% smaller than an 18-pulse system or up to 40% smaller than an active front end system, saving considerable deck space, especially when electric propulsion is used.

Weight savings are also significant, especially compared with 18-pulse systems, as no transformer is required.

Power supply safety

Comsys offers its solutions in modular sections, enabling a high degree of adaptability, as well as availability. Our standard system design offers n+1, but can be greatly increased by applying several control units with automatic running master functionality. This means that if one master unit trips, the remaining systems will reconfigure with a new master.

Automatic resonance sensing is a unique feature used for marine applications, whereby the power grid’s dynamics change dramatically based on the power supply and demand. If the ADF senses a resonance frequency, it adapts, thereby ceasing the escalation of any dangerous events.

Minimising power consumption

Comsys’ ADF system is installed in shunt with the loads, and is sized to compensate only the disturbances, which make up around 15%-25% of the total power. The result is an overall power consumption that is up to 2.3% points lower than active front end drives or 18-pulse drives.

Adaptability and compliance

The user-friendly web server interface allows easy-to-understand parameterisation, while the unique self-diagnostic functions enable a very easy-to-commission system.

The ADF’s active architecture enables it to adapt to changing loads, making it future-proof.

All systems offered by Comsys are designed for demanding marine conditions, and therefore fulfil marine and offshore standards.

Service and support

Comsys has more than 14 years of experience in power quality, producing active filters. We custom-make our services and systems for different types of installations and applications, and can provide a worldwide service through our network of representatives.

Make an enquiry

Follow this company

Follow the company to be always up to date with this company

Press Release

Comsys’s ADF Power Tuning White Paper Now Available for Download

Comsys have provided a free brochure detailing ADF Power Tuning, the company's energy-saving technology for a wide range of industrial applications.

White Papers

ADF Power Tuning Brochure

Engineered in Sweden, ADF Power Tuning provides a unique way of saving energy in a vast range of applications, such as industrial production machines and generator systems.

Comsys AB

Fältspatvägen 4


SE-224 78


+46 102 096 800 ADF P100 ADF P200 ADF P300

Comsys Images

Products and Services


Press Release

19 January 2016

Comsys have provided a free brochure detailing ADF Power Tuning, the company's energy-saving technology for a wide range of industrial applications.

Read more
18 December 2014

Comsys has received orders to provide active THD filtering for a total of 18 oil / chemical tankers in various new building and retrofit projects.

Read more
5 September 2014

COMSYS are very proud to announce that the ADF P300 series have been cUL certified.

Read more

Regional Offices

Comsys AB

Fältspatvägen 4


SE-224 78


+46 102 096 800 ADF P100 ADF P200 ADF P300

Contact company

I have read and accept the terms and conditions and privacy policys.
We'd like to keep you informed about relevant promotions, products and services, if you would like not to receive these, check this box.
If you would like to hear from carefully selected third party companies, check this box
Follow this company to receive notifications when they update.

Recommended for you

Simplifying maritime control room operations

Traditionally, maritime control room operators have had to sort through multiple data sources to make sense of everything, sometimes using…
Read More…


Go Top