Comsys has supplied Active Harmonic Filters to multiple offshore supply vessels. Bourbon Offshore, one of the biggest operators of offshore service vessels is using active filtering on their Evolution series of MPSVs. Filtering is employed on the main busbar to comply with class regulations. For a full report on the project and the result see here:
Bourbon Offshore Case by Comsys
Modular Passive Harmonic Filters from Schaffner – Ecosine Evo – the New Generation
The new PHF generation “ecosine evo” is designed for the most demanding harmonic mitigation tasks with front-end 6-pulse rectifiers.
Even partial load situations causing harmonic currents can be effectively mitigated. The introduction of a modular system allows the Ecosine Evo passive harmonic filter to deliver optimally tailored solutions for your particular installation. The solution is easily adapted by simply plugging in the suitable module where needed. For more information, watch this:
Active Harmonic Filters are becoming cheaper and very competitive compared to other active mitigation solutions such as Active Front End, which we explained here. In some applications that are not too dynamic, a passive harmonic filter makes perfect sense to reduce the investment. A combination of active and passive filters can be the best solution to reduce the investment cost while still being able to cope with dynamic loads. In such an application the passive harmonic filter focuses on the dominant harmonic component. This solution is currently used by for example the German auto industry in their production lines.
PQ Nosswitz, a German power quality solutions firm, devised a system to allow a flexible combination of active harmonic filters and passive harmonic filters to enable the most flexible and cost efficient solution for every project.
The paper industry is known for its high availability targets and
multiple variable frequency drive applications. Enclosed is a case study
from Schaffner showing the advantages of applying an active harmonic
filter solution to reduce the grid harmonics. As the active filters are
in parallel there is no risk of stopping the machine if the filter fails.
Here is a great showcase of the effects of applying active harmonic filters on a cable car installation made by Power More in Vietnam. Ba Na Hills Mountain Resort are holders of three Guiness Records – Longest single rope cable car system, Longest distance between stations and Heaviest cable roll. For Ba Na Hills, power quality is a question of safety and service quality. With total harmonic distortion 5 times higher than the national regulated level, Ba Na Hills were facing several problems.
- Station to station communcation was interrupted
- Power factor penalties
- Damaged PFC capacitor units
- Inerference with PFC controller
- Reduced motor effeciency in generator mode to 50%
Applying ADF Power Tuning active filters from Comsys to battle both power factor correction and harmonic filtering resulted in:
- Eliminated risk of PFC failures
- Eliminated power factor penalties
- Increased motor efficiency to 100%
- Improved cable speed
Active Filtering just got simpler with Sensorless Control
Comsys has released a new solution for controlling the Active Harmonic
Filter. The sensorless active filter control reduces the cost and
complexity of the system as it does not require any current transformer
In this case study they describe the retrofit on a small diesel
electric powered oil tanker, Fox Luna. The sensorless active filtering
approach is well equipped for protecting sensitive loads from dirty grids.
Sensorless Control Case Study
In this case study of the Luzern Conference Center in Switzerland, Schaffner demonstrate the full utility of the active harmonic filter application. The active filters are distributed throughout the building to compensate not only harmonics but also power factor correction as well as load balancing.
Leave it to the Swiss to adapt to multifunctional tools.