Green Energy

Different applications exist, such as via medium-voltage/low-voltage converters with converter transformers or gas engine generator sets that are operated using LNG to facilitate shore power supply for ships. A rotating frequency converter (MRFC) constitutes a much more cost-effective, robust and individual variant here that can be implemented in combination with a wide variety of electrical machines. This conversion technology has already proved itself to be very successful in maritime applications for decades and without high operating costs in the low and medium voltage range.

In order to generate a stable and resilient 60 Hz on-board power supply in the low and medium voltage range, we at Stolze GmbH decided to use two synchronous machines with different numbers of pole pairs here due to the special properties of the synchronous machines and the corresponding requirements of the marine grids.

Advantages of shore power supply using MRFC:

• Low acquisition and operating costs
• Mobile units (containerisierte Systeme)) can be realised at almost any location without large investments (can be set up flexibly in terms of the location)
• Flexible adaptation to the local conditions.
• Outstanding electrical properties and the often neglected situation onboard ships, such as high inrush currents of leakage and fire pumps in the event of fires, which have to be switched on in case of problems at the port
• High transient load capacity of the synchronous machines used here
• The MRFC requires little to no complex electronic converter technology, i.e. applications can be realised here that cope completely without power electronics.

To the illustration