SEMIKRON Upgrades High-Power Converter SEMISTACK_RE for Renewable Energy Applications

SEMIKRON, one of the leading manufacturers of power electronic components worldwide, upgrades SEMISTACK_RE, an IPM for renewable energy (RE). The new high-power converter for use in renewable energy applications such as wind and solar power installations will typically be used in synchronous and double-fed induction generators (DFIG) in wind turbines, as well as in central solar PV inverters.

SEMISTACK_RE is a water-cooled 3-phase converter that comes in B6CI 2-quadrant or 2 x B6CI 4-quadrant configurations in a book-case-type mechanical design. Up to four SEMISTACK_RE converters can be connected in parallel and support applications of up to 6MVA. The SEMISTACK_RE range is based on SKiiP 4, the latest generation of SEMIKRON's SKiiP intelligent power module family which integrates power components, driver and heat sink in a single case.

The previous version of SEMISTACK-RE based on the 3 bay version of SKiiP 3 has a current capability of 1,200A per module. The bigger 4-bay SKiiP 4 version has a current rating of between 1,000A and 1,400A. Thus, the maximum power carrying capacity of the SEMISTACK_RE converter increases by 17% to 1,7MVA. Thanks to the very low inductance planar DC busbar of the SEMISTACK_RE and the internal bus bar construction of the SKiiP 4 the nominal DC voltage can be extended up to 1250Vdc even in short circuit conditions.

The integrated new digital gate driver of SKiiP 4 provides a safe electrical isolation between primary and secondary side for all switching or control signals and even for the temperature signal. This allows to omit expensive circuits for electrical isolation for the user. The SKiiP driver features a CANopen setup and diagnosis channel – a first in a power module – which enables access to an error memory, meaning errors in the SKiiP 4 can be quickly identified and saved for later diagnosis.

Owing to its 100% solder free sintering process and innovative pressure contact system the thermal cycling capability of the SKiiP 4 is increased by a factor of 5 and the maximum junction temperature is raised to 175°C. These SKiiP 4 upgrades are coupled with long lifetime polypropylene capacitors to ensure highest reliability.

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