Analysis and Modeling of the Hybrid Vessel's Electrical Power System
A study on Power Quality, Short-Circuit Currents and Protection & Coordination
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Abstract
Zero emission fuels and reducing emissions are
important topics in all transport sectors and hybrid systems play a key role in
the transition towards full decarbonization. This thesis studies the components
that are found in hybrid maritime electrical power systems and their influence
on power quality, short-circuit currents and protection & coordination. In
order to help system integrators such as Alewijnse in the design of these
hybrid systems, two typical models of actual vessels are created in simulation
software ETAP. Both systems are low-voltage, high-power systems, based on
either an AC or DC busbar.
Rules and standards related to power quality and short-circuit currents are
studied as well as practical protection strategies. For the AC model, various
studies have been successfully simulated including a load flow study, transient
stability study including peak shaving and virtual generator simulations for
the battery, a protection & coordination study and a harmonic study. Some
challenges with ETAP regarding DC grid simulations are discussed, but is also
demonstrated how to use the formulas and standard approximation function from
the IEC 61660 to calculate short-circuit currents and I2t values and how to use
these results in the protection & coordination study.