WindEnergy 2018: Liebherr unveils a frequency converter system for multi-megawatt wind turbines

At the leading international wind energy trade fair WindEnergy 2018 in Hamburg, Liebherr unveils the Liduro Wind low-voltage frequency converter system for generator power outputs of up to 8 MW in back-to-back configuration to the professional public. With Liduro Wind, Liebherr Components presents a new development in the field of frequency converter technology to the wind industry. The power output of this system ranges from 1.5 MW to 8 MW and is designed for a voltage range of up to 690 V. The frequency converter is suitable for geared, hybrid and direct drive wind turbines utilising full inverters with both permanent magnet synchronous generators and separately excited synchronous generators. To convert the variable-speed power supply, the frequency inverter system can be installed in a space-saving manner within a gondola or on a tower platform.

Modern wind turbines require extremely reliable frequency converter systems in order to safely feed their steadily increasing power into the supply network. At the same time, safety requirements and service life expectations for frequency converter systems within wind turbines are also increasing. In order to meet these requirements, Liebherr-Components Biberach GmbH has equipped the new frequency converter system with an innovative cooling concept that keeps the temperature of the individual components low. This significantly increases the life expectation of the components and their quality. The frequency converter cabinets are designed with IP 54 level protection and are completely closed, so that they are independent of environmental influences and are applicable in extremely hot or cold regions without a change in their mechanical structure. The cooling power requirement for the wind turbines is reduced thanks to this high degree of protection as well as the effective liquid cooling.

Another innovation is the Liduro Fast Protection System, which provides a very fast and secure defect detection and repair. The simple service concept also eases repairs and maintenance work.

Liduro Wind is based on a platform architecture. Its core components are the high-performance power modules of the new LCU 300 series, which feature a high power density of up to 13.5 MW/m³ as well as a wide power range from 1 MW to 2 MW in only two designs.

One further considerable benefit of such a system design is the high flexibility with which individual wind turbines can be configured in even the most compact of installation spaces. This offers a wide range of possibilities for integration.

Learn more by visiting www.liebherr.com/frequency-converter-system