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This paper proposes a soft-switched three-port single-stage inverter (TPSI) for a photovoltaic (PV)-battery system. Compared to the existing soft-switched TPSIs, the proposed TPSI has the advantages of using the least number of switches and that all of the switches are capable of being turned on under the zero voltage switching (ZVS) condition. A prototype of the TPSI without using electrolytic capacitors...
In electric vehicle (EV) systems, bi-directional DC/DC converters are applied to interface the battery bank with the high voltage DC-link of the inverter. The control of the DC-link voltage is important for the high performance of the system. A DC-link voltage control strategy for the bidirectional DC/DC converter is proposed, which eliminates the need for detecting the operating mode and do not need...
In this paper a novel DC line-interactive uninterruptable power supply (UPS) with load leveling feature is proposed. The new UPS replaces the common AC three phase UPS and can be used for systems with pulse loads, and has superiority in performance and efficiency. The DC UPS utilizes Li-ion battery module in the DC link to perform the load leveling feature and UPS functionality. A Li-ion LFP based...
Electric vehicles rely on efficient charging techniques to maximize battery performance, efficiency and lifetime. Most EV on-board chargers are supplied from single phase AC mains, and contain 2nd order mains frequency harmonic in the battery current. This harmonic current incurs extra loss in the battery, increases battery temperature, and hence reduces charging efficiency and battery lifetime. Conventional...
This paper presents a new voltage control technique for grid-connected single-phase AC/DC converters. The proposed control system is able to significantly improve the performance of the closed-loop control system by using a nonlinear observer to extract the DC value of the DC-bus voltage. The proposed nonlinear observer is able to completely eliminate the impact of double-frequency ripple inherent...
This paper proposes an electrolytic capacitor-less bi-directional EV charger for V2G and V2H operation. The dc-dc converter stage of the proposed EV charger is a non-regulating series resonant converter (SRC) which can be designed with minimum voltage and current rating and always achieves ZCS turn ON and OFF. The unified inner loop of the proposed control block provides seamless mode transfer for...
This paper presents a closed-loop control technique in D-Q rotating frame for bi-directional single-phase AC/DC converters. The proposed control system allows the active and reactive power control in both directions from grid to vehicle and vehicle to grid, while controlling the DC-bus voltage. Due to the lack of freedom degrees required for orthogonal systems, using the D-Q frame is a challenge in...
Photovoltaic (PV) installations on the residential scale have been increasing tremendously and projected to continue to do so. Battery energy storage at the residential level has also become critical due to the increased adoption of residential scale PV. This paper proposes a new micro-inverter topology with integrated energy storage for PV applications. The proposed topology has a structure similar...
This paper proposes a novel and simple control method for the previously proposed smart charger for electric vehicles (EVs) on single-phase three-wire distribution feeders. The proposed method consists of only the constant dc-capacitor control, which is commonly used in active power line conditioners. No detection blocks of harmonic, reactive, and unbalanced-active currents are required. Thus, we...
Integrating the function of onboard battery charging into the traction drive system and accessory dc-dc converter in plug-in electric vehicles (PEVs) is shown to significantly reduce the cost and increase the power density of onboard chargers due to a substantially reduced component count. Replacing silicon (Si) based power devices with wide-band-gap (WBG) devices can further increase the power density...
The current trend in isolated microgrids is oriented to distributed renewable energy generators, such as photovoltaic (PV) generators and their corresponding distributed energy storage systems (ESS) as an unit denoted as active generator (PV+ESS). In an isolated microgrid, every distributed generator (ESS or PV) may operate in two operation modes (grid-forming or grid-following) in accordance to specific...
The Solid State Transformer (SST) is a revolutionary technology being developed by the authors. It has a tremendous number of features, which include power management, fault management and energy management. Its autonomous and distributed power management capability enables large-scale integration of distributed energy resources (DER) into the power grid. Specifically, it supports AC or DC connected...
Integrated charger topologies that have been researched so far are with the dc-dc converters and the charging functionality usually have no isolation in the system. Isolation is an important feature that is required for user interface systems that have grid connections and therefore is a major limitation that needs to be addressed along with the integrated functionality. This study features a unique...
Electric springs based on power electronics have been proposed as a demand response method for stabilizing power grid fed by substantial intermittent renewable energy sources. Associated with energy storage, they can provide active and reactive power compensation. Due to the limited storage capacity of the battery, this project explores a new control scheme for the third version of the electric springs...
Installing the battery energy storage in the interlinking converter of hybrid AD-DC grid can effectively reduce the exchanged energy of hybrid grid and therefore reduce the losses. Being different from the two-level or three-level interlinking converter for low voltage grid application, this paper proposes an interlinking modular multilevel converter (MMC) with integrated battery energy storage for...
This paper proposes an integrated power conversion system in electric vehicle using modular multilevel converter, whose modular structure could manage the integrated battery cells to simplify the traditional battery manage system (BMS) meanwhile provide the motor driving function and battery charging function without using additional hardware. The all-in topology could therefore maximize the capacity...
This paper investigates the impact of grid disturbances on the electric vehicle (EV) batteries in the grid-to-vehicle (G2V)/vehicle-to-grid (V2G) mode and the vehicle-to-home (V2H) mode. An 8 kW bi-directional EV charger system is designed and simulated. Based on the developed EV charger system, the different practical cases of voltage sag, voltage unbalance and local load variation are tested and...
Socially Interactive Robots (SIR) have many applications in rehabilitation, including psychological development of children with autism, children with complex neuro-developmental motor impairments, adults with dementia, etc. The animal-shaped or toy-shaped SIR should help engaging such individuals in physical and communication interaction, while any human presence during such sessions is typically...
This paper presents a design framework for a power electronic interface for a grid-tied (GT) low voltage DC distributed generation (DG) with short transient recovery between GT mode and islanding mode. The proposed interface contains controlled unidirectional and bidirectional floating interleaved converters (FIC), in addition to a smart grid-tied inverter (GTI) to optimize the overall performance...
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