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The modular multilevel converter (MMC) has become an attractive option for dc/ac conversion in many power system applications, in particular, for HVDC transmission. Due to its parallel arrangement of phase legs, the MMC is known to be a wye-configured architecture. In this paper, the equivalent delta formulation of the conventional wye architecture is introduced. The delta-configured MMC, enabled...
Medium-voltage grid codes for distributed energy resources are rapidly evolving. Next generation grid codes are anticipated to include stringent requirements for fault-ride-through and ancillary services, which is in stark contrast to existing codes formulated based on recommendations from the predominant IEEE Std. 1547-2003. To gain insight into the nature of these requirements, core features of...
Bursts of harmonics are a concern as they contribute to thermal heating of equipment and can trip sensitive devices. The time based index Tmaximum is recommended within the latest supplemental guide to IEEE Std. 519-1992 as an effective method to quantify harmonic bursts. However, the practical application of Tmaximum yields challenges. To address these challenges a replacement metric is proposed...
There is an apparent lack of micro-turbine dynamic models available in literature that include valid experimental data. In an effort to help fill this gap a thermodynamic based micro-turbine model supplemented with experimental data & validated calculations is introduced. The data was extracted from a study on the 60 kW Capstone C60 MicroTurbine™. Transfer functions describing the micro-turbine...
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