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Development of a battery energy loss observer based on improved equivalent circuit modelling (2016)
Conference Proceeding
Fares, A., Klumpner, C., & Sumner, M. (2016). Development of a battery energy loss observer based on improved equivalent circuit modelling. . https://doi.org/10.1109/EPE.2016.7695602

This paper proposes a new energy loss observer for batteries that has a good accuracy and low complexity. This observer can provide a support for battery management systems (BMS) in terms of predicting battery energy loss and/or battery internal temp... Read More about Development of a battery energy loss observer based on improved equivalent circuit modelling.

Hybrid inverter arrangements to facilitate reduced switching losses of the main inverter (2016)
Conference Proceeding
Klumpner, C., & Zargar, T. (2016). Hybrid inverter arrangements to facilitate reduced switching losses of the main inverter.

This paper investigates two hybrid inverter topologies consisting of a slow switching DC/AC main voltage source inverter and output series connected low-voltage rated, fast switching auxiliary inverters that may be suitable for medium and high voltag... Read More about Hybrid inverter arrangements to facilitate reduced switching losses of the main inverter.

Experimental validation of a hybrid converter with enhanced switching ripple cancellation (2016)
Journal Article
Papadopoulos, S., Klumpner, C., Rashed, M., & Wheeler, P. (2016). Experimental validation of a hybrid converter with enhanced switching ripple cancellation. IET Power Electronics, 9(12), 2360-2368. https://doi.org/10.1049/iet-pel.2015.0984

This study presents the experimental evaluation of a proposed new three phase hybrid converter topology for medium voltage applications. The topology is based on the interconnection of a low switching frequency voltage source inverter (VSI), rated at... Read More about Experimental validation of a hybrid converter with enhanced switching ripple cancellation.

The effect of including power converter losses when modelling energy storage systems: a UK domestic study (2016)
Conference Proceeding
Panagiotou, K., Klumpner, C., & Sumner, M. (2016). The effect of including power converter losses when modelling energy storage systems: a UK domestic study.

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
Papadopoulos, S., Rashed, M., Klumpner, C., & Wheeler, P. (2016). 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. IEEE Journal of Emerging and Selected Topics in Power Electronics, 4(1), 126-140. https://doi.org/10.1109/JESTPE.2015.2488631

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.

Dynamic phasor analysis and design of phase-locked loops for single phase grid connected converters (2015)
Journal Article
Rashed, M., Klumpner, C., & Asher, G. (2015). Dynamic phasor analysis and design of phase-locked loops for single phase grid connected converters. COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 34(4), https://doi.org/10.1108/COMPEL-04-2014-0090

The purpose of the paper is to introduce the Dynamic Phasor Modelling (DPM) approach for stability investigation and control design of single-phase Phase Locked Loops PLLs. The aim is to identify the system instabilities not predicted using the exist... Read More about Dynamic phasor analysis and design of phase-locked loops for single phase grid connected converters.

Experimental Evaluation and Efficiency Optimisation of a Grid-Connected Converter for Household Energy Storage Applications (2014)
Conference Proceeding
Kulsangcharoen, P., Asher, G., Rashed, M., Klumpner, C., Patel, C., & De, D. (2014). Experimental Evaluation and Efficiency Optimisation of a Grid-Connected Converter for Household Energy Storage Applications. In 7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014). https://doi.org/10.1049/cp.2014.0454

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.

A hybrid inverter system for medium voltage applications using a low voltage auxiliary CSI (2014)
Conference Proceeding
Papadopoulos, S., Rashed, M., Klumpner, C., & Wheeler, P. (2014). A hybrid inverter system for medium voltage applications using a low voltage auxiliary CSI. In 2014 IEEE Energy Conversion Congress and Exposition (ECCE). https://doi.org/10.1109/ecce.2014.6953779

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 A hybrid inverter system for medium voltage applications using a low voltage auxiliary CSI.

Assessing the accuracy of loss estimation methods for supercapacitor energy storage devices operating under constant power cycling (2014)
Conference Proceeding
Kulsangcharoen, P., Klumpner, C., Rashed, M., Asher, G., Chen, G. Z., & Norman, S. A. (2014). Assessing the accuracy of loss estimation methods for supercapacitor energy storage devices operating under constant power cycling. In 2014 16th European Conference on Power Electronics and Applications. https://doi.org/10.1109/epe.2014.6911043

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
Papadopoulos, S., Rashed, M., Klumpner, C., & Wheeler, P. (2014). A hybrid inverter solution for medium voltage applications using series capacitor and a CSI Active Power Filter (SC-APF). In 7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014). https://doi.org/10.1049/cp.2014.0456

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).

Regenerative multi-source power conversion system (2013)
Conference Proceeding
Klumpner, C. (2013). Regenerative multi-source power conversion system.

This presentation shows the progress made on the REGENSYS JTI-CS-2011-3-GRC-03-011 Clean Sky project as of December 2013.

Comparison of multilevel PWM versus interleaved based sinewave shaping for two-stage current source inverters used in PV applications (2013)
Conference Proceeding
Papadopoulos, S., & Klumpner, C. (2013). Comparison of multilevel PWM versus interleaved based sinewave shaping for two-stage current source inverters used in PV applications. In 2013 15th European Conference on Power Electronics and Applications (EPE). https://doi.org/10.1109/EPE.2013.6634633

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
De, D., Klumpner, C., Patel, C., Kulsangcharoen, P., Rashed, M., & Asher, G. (2013). Modelling and control of a multi-stage interleaved DC-DC converter with coupled inductors for super-capacitor energy storage system. IET Power Electronics, 6(7), https://doi.org/10.1049/iet-pel.2012.0529

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
De, D., Klumpner, C., Rashed, M., Patel, C., Kulsangcharoen, P., & Asher, G. (2012). Achieving the desired transformer leakage inductance necessary in DC-DC converters for energy storage applications. In 6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012). https://doi.org/10.1049/cp.2012.0212

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.

Assessing the benefits of hybrid cycloconverters (2011)
Journal Article
Xu, T., Klumpner, C., & Clare, J. (2011). Assessing the benefits of hybrid cycloconverters. IEEE Transactions on Industrial Electronics, 59(1), https://doi.org/10.1109/TIE.2011.2165194

Power converters consisting of naturally commutated thyristors such as cycloconverters and current source inverters were the first to be used in driving electrical motors with variable speed, but now, due to their inferior performance compared to for... Read More about Assessing the benefits of hybrid cycloconverters.

Characterization of energy storage devices for constant power applications (2010)
Conference Proceeding
Kulsangcharoen, P., Klumpner, C., Rashed, M., & Asher, G. (2010). Characterization of energy storage devices for constant power applications. In IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society. https://doi.org/10.1109/IECON.2010.5675401

In this paper, a few known characterization techniques for supercapacitors have been evaluated with the purpose of being able to predict the roundtrip efficiency of an energy storage system under constant power application. It is found that the user... Read More about Characterization of energy storage devices for constant power applications.

High performance multilevel converter topology for interfacing energy storage systems with medium voltage grids (2010)
Conference Proceeding
Rashed, M., Klumpner, C., & Asher, G. (2010). High performance multilevel converter topology for interfacing energy storage systems with medium voltage grids. In IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society. https://doi.org/10.1109/IECON.2010.5675400

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
Rashed, M., Klumpner, C., & Asher, G. (2010). Hybrid cascaded multilevel converter with integrated series Active Power Filter for interfacing energy storage system to medium voltage grid. In The 2010 International Power Electronics Conference - ECCE ASIA -. https://doi.org/10.1109/IPEC.2010.5543461

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.