Chenye Wu, Hamed Mohsenian‐Rad, Jianwei Huang, Juri Jatskevich
With the increasing popularity of plug-in electric vehicles (PEVs), they will be able to help the power grid by providing various ancillary services. In fact, recent studies have suggested that PEVs can participate in frequency regulation. In this paper, we consider offering both, i.e., combined, frequency and voltage regulation by PEVs. In this regard, we first investigate a set of constraints that need to be taken into account on PEVs' active and reactive power flow to offer ancillary services. Next, we formulate two joint optimization problems, based on different pricing and contract scenarios, that can be solved for optimal combined offering of frequency and voltage regulation by PEVs. They address both day-ahead command-based and day-ahead price-based models. Simulation results show that the proposed designs can benefit both users and utilities.
Victor Manuel Hernández-Guzmán, Victor Manuel Hernández-Guzmán
In a recent work the author presented a hybrid control scheme for series resonant inverters owning a number of nice properties. In the present work several refinements and bounds on the allowable parameters are obtained yielding a more precise methodology to design the hybrid control scheme presented in the previos work. In particular we define the permissible range of loads and controller gains, we present a complete proof for asymptotic stability when the hybrid control strategy is used and we ensure that no catastrophic failure occurs when a zero resistance is used as load. Another important new feature in this note is that results do not require the exact knowledge of any of the plant parameters.