Skip to main content

Research Repository

Advanced Search

Outputs (87)

Analysis and Experimental Evaluation of a Soft Switching Boost Converter with Unbalanced Capacitor Voltage (2024)
Journal Article

This paper presents a novel unbalanced capacitor voltage (UCV) soft switching boost converter under full loads range with a simple control scheme. The topology consists of a half bridge switching-leg, filter inductor, and an auxiliary circuit contain... Read More about Analysis and Experimental Evaluation of a Soft Switching Boost Converter with Unbalanced Capacitor Voltage.

Sliding Mode Input Current Control of the Synchronous DC-DC Buck Converter for Electro-Mechanical Actuator Emulation in More Electric Aircrafts (2022)
Journal Article

The main challenges of the input current control in synchronous DC-DC buck converters are the nonlinear model of the system, changes of the operating point in a wide range, and the need to use an input LC filter for current smoothing, which may resul... Read More about Sliding Mode Input Current Control of the Synchronous DC-DC Buck Converter for Electro-Mechanical Actuator Emulation in More Electric Aircrafts.

A Novel Multiport DC-DC Converter for Enhancing the Design and Performance of Battery–Supercapacitor Hybrid Energy Storage Systems for Unmanned Aerial Vehicles (2022)
Journal Article

This paper proposes an integrated multiport non-isolated DC–DC converter system for integrating battery–supercapacitor hybrid energy storage with photovoltaics for solar-powered unmanned aerial vehicles applications. Compared to the traditional topol... Read More about A Novel Multiport DC-DC Converter for Enhancing the Design and Performance of Battery–Supercapacitor Hybrid Energy Storage Systems for Unmanned Aerial Vehicles.

Modeling and experimental evaluation of z-source modular multilevel converter using reduced inserted cells technique (2021)
Journal Article

The integration of a Z-source network with a modular multilevel converter (MMC) to provide voltage step-up function is proposed in this paper. The proposed Z-source modular multilevel converter (ZS-MMC) uses a Z-source network connected between the D... Read More about Modeling and experimental evaluation of z-source modular multilevel converter using reduced inserted cells technique.

Trade-off Analysis of Energy Storage Systems for Helicopter Landing Gear Electromechanical Actuator (2021)
Conference Proceeding

The aerospace industry is rapidly changing towards more electric aircraft initiative, trying to alleviate pollution problems and obey the authority bodies' strict rules. Not only should aircraft comply with this initiative but also helicopters (i.e.,... Read More about Trade-off Analysis of Energy Storage Systems for Helicopter Landing Gear Electromechanical Actuator.

Experimental evaluation of an energy storage system for medium voltage distribution grids enabling solid?state substation functionality (2021)
Journal Article

"Smart grids" is a new concept of managing the power transfer in modern grids that will rely not only on the on-line processing of a variety of consumption and generation power data but will also need new hardware to facilitate a flexible and efficie... Read More about Experimental evaluation of an energy storage system for medium voltage distribution grids enabling solid?state substation functionality.

Quasi Z-Source Hybrid Modular Multilevel Converter Controlled By Reduced Inserted Cells Modulation Technique For Medium Voltage Applications (2020)
Presentation / Conference

This paper presents a novel quasi Z-source Hybrid modular multilevel converter (qZS-HMMC) for medium voltage applications where the “hybrid” concept refers to the implementation of the MMC strings that consist of a mixture of half bridge sub-modules... Read More about Quasi Z-Source Hybrid Modular Multilevel Converter Controlled By Reduced Inserted Cells Modulation Technique For Medium Voltage Applications.

Analysing the converter requirements for a dual-fed induction machine based flywheel energy storage system (2020)
Presentation / Conference

The Dual-fed Induction Machine was used very successfully in wind generators as it allowed full control of the power captured from the wind within a wide relevant rotational speed range around the synchronous speed needing only a low power rated roto... Read More about Analysing the converter requirements for a dual-fed induction machine based flywheel energy storage system.

Energy Storage System Selection for Optimal Fuel Consumption of Aircraft Hybrid Electric Taxiing Systems (2020)
Journal Article

IEEE Aircraft taxiing is conventionally performed using the main engines’ inefficient idle thrust. Therefore, in line with greener aviation, the electrification of taxiing is the most viable option to reduce emissions, noise, and fossil fuel consumpt... Read More about Energy Storage System Selection for Optimal Fuel Consumption of Aircraft Hybrid Electric Taxiing Systems.

Experimental Validation of a quasi Z-Source Modular Multilevel Converter with DC Fault Blocking Capability (2019)
Journal Article

This paper considers the design methodology and the modulation of the quasi Z-source modular multilevel converter (qZS-MMC) with half bridge sub-modules and evaluates its performance in voltage boosting mode for medium voltage applications. The qZS-M... Read More about Experimental Validation of a quasi Z-Source Modular Multilevel Converter with DC Fault Blocking Capability.

A Novel Modular Multiport Converter for Enhancing the Performance of Photovoltaic-Battery Based Power Systems (2019)
Journal Article

This paper introduces a novel multiport power converter with modular architecture for photovoltaic (PV)-battery based power systems. Compared to conventional centralized multiport converters, the proposed converter significantly improves the utilizat... Read More about A Novel Modular Multiport Converter for Enhancing the Performance of Photovoltaic-Battery Based Power Systems.

Optimising the structure of a cascaded modular battery system for enhancing the performance of battery packs (2019)
Journal Article

The overall performance of battery packs may be affected by imbalances between the series connected cells which is more likely in packs with high number of cells needed to provide a high voltage as needed for example in electric vehicles. In this cas... Read More about Optimising the structure of a cascaded modular battery system for enhancing the performance of battery packs.

Design Considerations to Optimise Supercapacitor-based Energy Storage Systems for Aerospace Applications (2018)
Conference Proceeding

© 2018 IEEE. This paper investigates the design optimization of a supercapacitor-based energy storage system for aerospace applications which may be needed to complement the operation of a high power pulsed load such as electromechanical actuators ha... Read More about Design Considerations to Optimise Supercapacitor-based Energy Storage Systems for Aerospace Applications.

A comparison of modulation techniques for three-phase quasi Z-source modular multilevel converter able to provide DC-link fault blocking capability (2018)
Presentation / Conference

Future transmission and distribution grids will use power converters to enable interface with HVDC systems and the Modular Multilevel Converter (MMC) is a topology that is already employed in commercial systems. The MMC converter inherent the benefit... Read More about A comparison of modulation techniques for three-phase quasi Z-source modular multilevel converter able to provide DC-link fault blocking capability.

Energy harvesting utilizing reciprocating flow-induced torsional vibration on a T-shaped cantilever beam (2018)
Journal Article

This paper proposes a T-shaped cantilever energy harvester powered by flow-induced torsional vibration. To collect and convert the mechanical (kinetic) energy into electric power, a pair of symmetrical acrylic cylindrical bluff bodies were installed... Read More about Energy harvesting utilizing reciprocating flow-induced torsional vibration on a T-shaped cantilever beam.

Sizing guidelines for grid-connected decentralised energy storage systems: single house application (2018)
Conference Proceeding

Nowadays, the existing hierarchical, centrally controlled power grid faces new challenges due to the increase penetration of renewable sources, the need of implementing demand side management and the 2020 and 2050 environmental targets. A promising c... Read More about Sizing guidelines for grid-connected decentralised energy storage systems: single house application.

Optimising the structure of a cascaded modular battery system for enhancing the performance of battery packs (2018)
Conference Proceeding

The overall performance of battery packs may be affected by imbalances between the series connected cells which is more likely in packs with high number of cells needed to provide a high voltage as needed for example in electric vehicles. In this cas... Read More about Optimising the structure of a cascaded modular battery system for enhancing the performance of battery packs.

Investigating the benefits and limitations of cascaded converter topologies used in modular battery systems (2017)
Conference Proceeding

The Performance of battery packs is highly affected by imbalances between the series connected cells that provide the required string voltage. A modular battery implementation based on cascaded converters can have advantages over traditional centrali... Read More about Investigating the benefits and limitations of cascaded converter topologies used in modular battery systems.

Being a member of an energy community: Assessing the financial benefits for end-users and management authority (2017)
Conference Proceeding

Since 2011, in the context of sustainable development, UK government has been encouraging individuals to work as groups, and now, more than 5,000 community led projects are sprouted across the country, since more than 50% of the UK citizens had expre... Read More about Being a member of an energy community: Assessing the financial benefits for end-users and management authority.

Mitigating the effect of series capacitance unbalance on the voltage reduction capability of an auxiliary CSI used as switching ripple active filter (2017)
Conference Proceeding

The use of series connected capacitors for high voltage applications has been proven to be beneficial for voltage stress reduction across power semiconductors. In a 3-phase grid any asymmetry in the value of the series capacitance may lead to signifi... Read More about Mitigating the effect of series capacitance unbalance on the voltage reduction capability of an auxiliary CSI used as switching ripple active filter.

The effect of including power converter losses when modelling energy storage systems: a UK domestic study (2016)
Conference Proceeding

Energy storage systems (ESS) are seen as an increasingly important technology for managing electrical distribution systems, and there is now much research into both the underlying technologies of these systems, and their “optimum” management especial... Read More about The effect of including power converter losses when modelling energy storage systems: a UK domestic study.

Investigations in the Modeling and Control of a Medium-Voltage Hybrid Inverter System That Uses a Low-Voltage/Low-Power Rated Auxiliary Current Source Inverter (2015)
Journal Article

Hybrid converters consist of a main inverter processing the bulk of the power with poor waveform performance and a fast and versatile auxiliary inverter to correct the distortion. In this paper, the main converter is a medium voltage NPC inverter and... Read More about Investigations in the Modeling and Control of a Medium-Voltage Hybrid Inverter System That Uses a Low-Voltage/Low-Power Rated Auxiliary Current Source Inverter.

Experimental Evaluation and Efficiency Optimisation of a Grid-Connected Converter for Household Energy Storage Applications (2014)
Conference Proceeding

This paper presents the design and the experimental evaluation of a power converter for energy storage applications suitable for household installation or to facilitate distributed energy storage capability within a local/community low-voltage grid.... Read More about Experimental Evaluation and Efficiency Optimisation of a Grid-Connected Converter for Household Energy Storage Applications.

Assessing the accuracy of loss estimation methods for supercapacitor energy storage devices operating under constant power cycling (2014)
Conference Proceeding

This paper assesses different energy loss estimation methods using the supercapacitor model parameters extracted from the electrochemical impedance spectroscopy (EIS). Two energy loss estimation methods are applied to two similar supercapacitors from... Read More about Assessing the accuracy of loss estimation methods for supercapacitor energy storage devices operating under constant power cycling.

A hybrid inverter solution for medium voltage applications using series capacitor and a CSI Active Power Filter (SC-APF) (2014)
Conference Proceeding

This paper proposes a new hybrid inverter solution for medium/high voltage applications that consists of a slow switching inverter using high voltage or series connected switching devices, fitted with a low kVA rated auxiliary current source inverter... Read More about A hybrid inverter solution for medium voltage applications using series capacitor and a CSI Active Power Filter (SC-APF).

Comparison of multilevel PWM versus interleaved based sinewave shaping for two-stage current source inverters used in PV applications (2013)
Conference Proceeding

This paper investigates the advantages of using interleaved based direct sinusoidal current shaping techniques as alternative to 5-level Pulse Width Modulation (PWM) when used in conjunction to a two stage Current Source Inverter (CSI) in PV applicat... Read More about Comparison of multilevel PWM versus interleaved based sinewave shaping for two-stage current source inverters used in PV applications.

Modelling and control of a multi-stage interleaved DC-DC converter with coupled inductors for super-capacitor energy storage system (2013)
Journal Article

Interleaved converters with coupled inductors are widely used to share load current in high power applications. It offers high equivalent switching frequency and reduced output current ripples using small size magnetic components. Due to smaller comm... Read More about Modelling and control of a multi-stage interleaved DC-DC converter with coupled inductors for super-capacitor energy storage system.

Achieving the desired transformer leakage inductance necessary in DC-DC converters for energy storage applications (2012)
Conference Proceeding

This paper presents a cost effective winding design and evaluation of a medium frequency isolation transformer typically used in bidirectional isolated DC/DC converters. Since leakage inductance and winding resistance of a high frequency transformer... Read More about Achieving the desired transformer leakage inductance necessary in DC-DC converters for energy storage applications.

High performance multilevel converter topology for interfacing energy storage systems with medium voltage grids (2010)
Conference Proceeding

This paper proposes a high performance hybrid cascaded H-Bridge (HB) Multilevel Converter (MLC) with integrated Series Active Power Filter SAPF for interfacing energy storage systems with medium voltage grids. Isolated DC sources comprised of modular... Read More about High performance multilevel converter topology for interfacing energy storage systems with medium voltage grids.

Hybrid cascaded multilevel converter with integrated series Active Power Filter for interfacing energy storage system to medium voltage grid (2010)
Conference Proceeding

This paper presents a new control strategy for a high performance hybrid cascaded H-Bridge HB multilevel converter with integrated series Active Power Filter Stage APFS. Unequal DC voltage sources are used to energise the converter's HBs. This offers... Read More about Hybrid cascaded multilevel converter with integrated series Active Power Filter for interfacing energy storage system to medium voltage grid.

Wind turbine-energy storage control system for delivering constant demand power shared by DFIGs through droop characteristics (2009)
Conference Proceeding

This paper investigates embedding Energy Storage (ES) with multiple wind turbines in order to deliver to the grid a smooth and constant power as demanded by the system operator. The demand power is shared by DFIGs proportional to their ratings utiliz... Read More about Wind turbine-energy storage control system for delivering constant demand power shared by DFIGs through droop characteristics.

A cost-effective solution to power the gate drivers of multilevel inverters using the bootstrap power supply technique (2009)
Conference Proceeding

Multilevel inverters are traditionally seen as a step forward in DC/AC conversion, providing more output voltage levels, better quality of the generated waveform and lower switching losses than the two-level and can process higher voltages with a giv... Read More about A cost-effective solution to power the gate drivers of multilevel inverters using the bootstrap power supply technique.

A new hybrid cycloconverter with smooth output voltage generation capability and accurate control of the circulating current
Conference Proceeding

Nowadays, power electronic converters based exclusively on IGBTs deliver excellent load side performance up to megawatt powers in the low voltage range (200-690V) and are steadily gaining performance in the medium voltage range as well. However, the... Read More about A new hybrid cycloconverter with smooth output voltage generation capability and accurate control of the circulating current.

A new single-stage current source inverter for photovoltaic and fuel cell applications using reverse blocking IGBTs
Conference Proceeding

Renewable energy sources such as photovoltaics (PVs) or fuel cells (FCs) are not fitted for direct power grid connection because they deliver DC voltage and current. This is why a power electronic interface is needed, consisting usually of a current-... Read More about A new single-stage current source inverter for photovoltaic and fuel cell applications using reverse blocking IGBTs.

A more efficient current source inverter with series connected AC capacitors for photovoltaic and fuel cell applications
Conference Proceeding

Renewable energy sources such as photovoltaics (PVs) or fuel cells (FCs) are not fitted for direct power grid connection because they deliver DC voltage and current. In addition, they also have a high internal resistance/nonlinear V/I dependence, whi... Read More about A more efficient current source inverter with series connected AC capacitors for photovoltaic and fuel cell applications.

A current source inverter with series connected AC capacitors for photovoltaic application with grid fault ride through capability
Conference Proceeding

The current source inverter (CSI) is preferred to interface a renewable source such photovoltaics (PV) to the AC power grid because it can provide smooth current source in the DC side, which fits to the PV behaviour and also steps-up the voltage from... Read More about A current source inverter with series connected AC capacitors for photovoltaic application with grid fault ride through capability.

Efficiency evaluation of a novel supercapattery stack with a power electronic interface for energy storage systems
Conference Proceeding

The increase of renewable energy generation seen as the only way to ensure clean and sustainable development, is under scrutiny due to its intermittent nature and an insufficient development of com-plementary technologies such as electrical energy st... Read More about Efficiency evaluation of a novel supercapattery stack with a power electronic interface for energy storage systems.

A power electronic controlled dump load with negligible harmonics for accurate loading used in testing small wind turbines
Conference Proceeding

Permanent magnet synchronous generators (PMSG) are at the core of small scale wind power generators manufactured by a wide range of manufacturers in different configurations: vertical or horizontal axis blades, with various geometries and aerodynamic... Read More about A power electronic controlled dump load with negligible harmonics for accurate loading used in testing small wind turbines.

A hybrid indirect matrix converter immune to unbalanced voltage supply, with reduced switching losses and improved voltage transfer ratio
Conference Proceeding

Achieving a compact and efficient design of power electronic converters is not a straightforward procedure: minimizing the size of the filter requires a higher switching frequency that causes additional switching losses that will require a larger hea... Read More about A hybrid indirect matrix converter immune to unbalanced voltage supply, with reduced switching losses and improved voltage transfer ratio.