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Single-phase power converters are commonly employed to integrate renewable sources, such as solar PV or fuel cells, among other applications. However, they typically require large and limited lifetime electrolytic capacitors to filter large DC side ripple components, representing a limit for the power density and durability of converters, potentially making the technology unpractical for some applications...
Climate change and Greenhouse Gas (GHG) emission reduction efforts have generated an interest in microgrid research due to its ability to integrate renewable energy sources and storage to existing grid infrastructure. Economizing microgrids through use of DC microgrids has become a major research focus. This paper proposes a novel converter topology that offers high-efficiency, reduced filter requirements...
The demand for increased drive range has motivated research in fast charging solutions for the electric vehicle. This work proposes an integrated charger based on the dual inverter to enable rapid electric vehicle charging from the AC or DC grid without additional DC/DC converters. Simulation studies demonstrate functionality of constant current - constant voltage control and energy balancing of dual...
The technical challenges associated with distributed generation along with the increased adoption of electric vehicles has motivated the development of new configurations for dc microgrids. In this paper, a novel unidirectional multi-port power converter acts as the building block for interfacing different configurations of PV energy conversion systems, allowing it to reach high efficiency for a wide...
Practical challenges in distributed generation and electric vehicles have motivated the rapid development of bidirectional multi-port dc-dc converters. This paper proposes a converter that not only can perform fast battery voltage balancing and limit ground leakage current, it also features low switching ripple and component count, providing significant cost savings from reduced filter requirements...
This paper presents a novel unidirectional DC/DC converter that can be used to transfer power from distributed resources such as Solar PV or Fuel Cells into a DC microgrid. The converter is based on the LLC topology but designed to operate in a specific region of the gain curve that provides several benefits to integration of renewable energy sources into a constant DC bus. The isolated converter...
This work proposes a three-port converter structure for high-voltage dc (HVDC) applications to facilitate power flow routing between a controlled dc bus and two independent dc networks. Control of line power flows is achieved via the series injection of incremental dc voltages between the networks, thus the converter structure is only rated for a fraction of the rated power and voltage of the connecting...
This paper proposes a high step-up, transformerless, dc/dc converter suitable for applications where high efficiency at low power throughput is required. The proposed converter achieves high step-up dc/dc conversion through a resonant LC tank and realizes high-efficiency operation via the softswitching enabled by this resonant network. Flat efficiency is obtained via discontinuous conduction mode...
This work introduces a new Multiple-Input Multiple-Output Modular Multilevel dc-dc Converter (MIMO-MMC). The proposed topology has a bidirectional structure and may be utilized in both low and high power applications ranging from approximately 100W to 10MW. The modular structure of the MIMO-MMC enables efficient component utilization through module voltage and current sharing capabilities. The topology...
Energy storage (ES) integration into the grid is typically achieved by using single-stage converters interconnected to long series connected strings of battery cells. Such configurations are susceptible to reliability issues as no mechanism exists to address failure of individual battery cells. DC bus fault currents are also excessively large in such systems, which degrades safety and adds complexity...
This paper presents the first dynamic model of the DC-MMC, a new class of modular multilevel single-stage dc/dc converters aptly suited for HVDC systems. A state-space model for a single string of the DC-MMC is developed and validated by comparing with time-domain simulation results from a comprehensive switched converter model. The developed averaged model is utilized to investigate submodule capacitor...
When harmonic resonance problems exist in large networks, it can be difficult to identify the extent to which various capacitors and inductors in the system contribute to these problems. This paper attempts to address this issue by presenting a new method for identifying the relative participation of capacitors and inductors on the amplification of harmonics in the system. Specifically the participation...
Utilizing strings of cascaded submodules for multilevel dc/ac conversion has become well known due to the widespread popularity of the modular multilevel converter (MMC). Recently, it has been shown that these submodule strings can be adapted to achieve single-stage dc/dc conversion. Although the modular string configurations for dc/ac versus dc/dc conversion are similar, the underlying power transfer...
In this paper, a novel bidirectional modular multi-level dc-dc converter is proposed. The proposed topology, named the Triangular Modular Multilevel dc-dc Converter (TMMC), can achieve equal power sharing among its modules over a broad range of conversion ratios. The proposed control algorithm provides localized control of modules which enhances the converter's dynamic performance and design flexibility...
This paper introduces a power flow controller that can be deployed to interconnect DC networks of different or similar voltage levels and manage the power flow between them. Its key features include: 1) bidirectional power flow 2) both step-up and step-down operation and 3) bidirectional fault blocking similar to a DC circuit breaker. Moreover, its modular architecture makes it aptly suited for high-voltage...
This paper introduces a reactive power control method for a grid tied single phase Voltage Sourced Inverter (VSI), which is used for residential photovoltaic (PV) power integration. The focus is on designing a low complexity grid synchronization method, which decouples the active and reactive power component so that each component can be controlled independently. The AC current and DC voltage controllers...
This paper introduces novel functional electrical stimulation (FES) system architecture. Compared to the existing state of the art solutions [1]–[15], the presented FES system drastically increases variety of stimulation pulses, results in a less painful therapy and has significantly lower power consumption. Furthermore, the FES system inherently provides zero net charge of stimulated tissue eliminating...
Typical power factor correcting power supplies contain large energy storage components that filter the pulsating power that is created by an AC power source, or required by an AC power sink. This work focuses on using advanced digital control strategies to reduce the size of those energy storage components to reduce the overall size and cost of the PFC power converter.
This paper presents a voltage-power /frequency-reactive power (VP/FQ) cross droop control scheme that allows multiple voltage source converters (VSCs) to operate in parallel with conventional generators in a microgrid. Each current controlled VSC in such a microgrid has its own VP/FQ cross droop controller that sets its current references to regulate the voltage and frequency of a common microgrid...
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