Biblio

The class φ2 is a single transistor, fast transient inverter topology often associated with power conversion at very high frequency (VHF: 30MHz-300MHz). At VHF, gate drivers available on the market fail to provide the adequate transistor switching signal. Hence, there is a need for new power topologies that do no make use of gate drivers but are still suitable for power conversion at VHF. In This paper, we introduce a new class φ;2 topology that incorporates an oscillator, which takes the drain signal through a feedback circuit in order to force the transistor switching. A design methodology is provided and a 1MHz 20V input prototype is built in order to validate the topology behaviour.

Momentum towards realization of smart grid will continue to result in high penetration of renewable fed Distributed Energy Resources (DERs) in the Electric Power System (EPS). The drive towards resiliency will enable a modular topology where several microgrids are tied to-gather, operating synchronously to form the future EPS. These microgrids may very well evolve to be fed by 100% Inverter Based Resources (IBRs), and required to operate reliably in both grid-connected and islanded modes. Since microgrids will evolve from existing distribution feeders, they will be unbalanced in terms of load, phases, and feeder-impedances. Protection and control of such microgrids, spanning over grid-connected mode, islanded mode, and transition mode need urgent attention. This paper focuses on the control aspect to facilitate stable operation and power sharing under these modes. A detailed EMTP model of a testbed using the IEEE 13-bus system is created in PSCAD, involving multiple inverters. Control strategy, modes, and implementation of inverter controls are described, and results showing stable operation and power sharing in all modes are presented.