Load Sharing in Ship Microgrids Under Nonsinusoidal Conditions—Case Study

The paper is focused on the problem of load sharing between generators running in parallel in ship microgrids loaded by variable-speed drives with power converters. It is based on an experimental study of a number of real cases recorded on three ships. Chosen power quantities defined in the IEEE 1459-2010 standard are calculated, and their sharing between generators working in parallel in ship systems are assessed. Particularly, sharing of active, nonactive, and apparent power as well as active, reactive, and apparent power of voltage and current fundamental components is determined for various loads. The levels of voltage and current distortions as well as harmonic power flow are also assessed. The results are commented on in the wake of related provisions of ship classification societies rules. Finally, it has been determined that there are differences between sharing of various power components, which must not be neglected, particularly in the case of nonactive power and fundamental reactive power. Therefore, amendments to related ship classification societies rules are necessary.