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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.

Wind turbine-energy storage control system for delivering constant demand power shared by DFIGs through droop characteristics (2009)
Conference Proceeding
Fazeli, M., Asher, G., Klumpner, C., Bozhko, S., Yao, L., & Bazargan, M. (2009). Wind turbine-energy storage control system for delivering constant demand power shared by DFIGs through droop characteristics. In 2009 13th European Conference on Power Electronics and Applications

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
Klumpner, C., & Shattock, N. (2009). A cost-effective solution to power the gate drivers of multilevel inverters using the bootstrap power supply technique. In 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition. https://doi.org/10.1109/APEC.2009.4802910

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.

Experimental evaluation of hybrid cycloconverters (2009)
Conference Proceeding
Klumpner, C., Xu, T., & Clare, J. C. (2009). Experimental evaluation of hybrid cycloconverters. In 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition. https://doi.org/10.1109/APEC.2009.4802737

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

Implementation of a hybrid AC-AC direct power converter with unity voltage transfer (2008)
Journal Article
Wijekoon, T., Klumpner, C., Zanchetta, P., & Wheeler, P. (2008). Implementation of a hybrid AC-AC direct power converter with unity voltage transfer. IEEE Transactions on Power Electronics, 23(4), https://doi.org/10.1109/TPEL.2008.924601

This paper presents a novel hybrid direct power converter (HDPC) which overcomes the two main disadvantages of matrix converters: limited voltage transfer ratio and low immunity to grid disturbance. The proposed converter is formed by integrating a r... Read More about Implementation of a hybrid AC-AC direct power converter with unity voltage transfer.

Hybrid matrix converter topologies: an exploration of benefits (2008)
Conference Proceeding
Klumpner, C., & Pitic, C. (2008). Hybrid matrix converter topologies: an exploration of benefits. In 2008 IEEE Power Electronics Specialists Conference. https://doi.org/10.1109/PESC.2008.4591887

Matrix converters are direct AC/AC power converters that can operate with sinusoidal output/input voltage/currents without the need of passive components to store energy, which means that they are grid friendly and have a great weight/volume reductio... Read More about Hybrid matrix converter topologies: an exploration of benefits.

A new class of hybrid AC/AC direct power converters
Conference Proceeding
Klumpner, C., Wijekoon, T., & Wheeler, P. (in press). A new class of hybrid AC/AC direct power converters. In Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005. https://doi.org/10.1109/IAS.2005.1518793

Variable voltage and variable frequency conversion of electrical energy from an AC source to an AC load is done in traditional power converters via a DC-link where an energy storage element (electrolytic capacitors) is situated. Despite its well-know... Read More about A new class of hybrid AC/AC direct power converters.

A hybrid indirect matrix converter immune to unbalanced voltage supply, with reduced switching losses and improved voltage transfer ratio
Conference Proceeding
Klumpner, C. (in press). A hybrid indirect matrix converter immune to unbalanced voltage supply, with reduced switching losses and improved voltage transfer ratio. In Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06. https://doi.org/10.1109/APEC.2006.1620528

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.

A new two-stage voltage source inverter with modulated DC-link voltage and reduced switching losses
Conference Proceeding
Klumpner, C. (in press). A new two-stage voltage source inverter with modulated DC-link voltage and reduced switching losses. In IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics. https://doi.org/10.1109/IECON.2006.347904

This paper proposes a new DC/AC power converter topology that is obtained by merging a buck type DC/DC converter and a DC/AC three-phase PWM Voltage Source Inverter (VSI) without the need of the passive components (smoothing inductor and capacitance)... Read More about A new two-stage voltage source inverter with modulated DC-link voltage and reduced switching losses.

A new three-level sparse indirect matrix converter
Conference Proceeding
Klumpner, C., Lee, M. Y., & Wheeler, P. (in press). A new three-level sparse indirect matrix converter. In IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics. https://doi.org/10.1109/IECON.2006.347958

Matrix converters are forced commutated single stage AC/AC direct frequency changers able to achieve sine wave in and out operation by being able to connect any input phase to any output phase via a 3x3 matrix of bi-directional switches. Indirect two... Read More about A new three-level sparse indirect matrix converter.

A new hybrid cycloconverter with smooth output voltage generation capability and accurate control of the circulating current
Conference Proceeding
Klumpner, C., Xu, T., & Clare, J. (in press). A new hybrid cycloconverter with smooth output voltage generation capability and accurate control of the circulating current. In IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics. https://doi.org/10.1109/IECON.2006.347850

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 three-level indirect matrix converter with reduced number of switches
Conference Proceeding
Klumpner, C., Lee, M. Y., Pitic, C., Wheeler, P., & Zanchetta, P. (in press). A new three-level indirect matrix converter with reduced number of switches. In 2007 IEEE Industry Applications Annual Meeting. https://doi.org/10.1109/07IAS.2007.28

Matrix converters are sine wave in/out forced commutated single-stage AC/AC direct frequency changers using a single bi-directional switch to connect any input to any output. Indirect two-stage matrix converters provide similar input and output perfo... Read More about A new three-level indirect matrix converter with reduced number of switches.

A new single-stage current source inverter for photovoltaic and fuel cell applications using reverse blocking IGBTs
Conference Proceeding
Klumpner, C. (in press). A new single-stage current source inverter for photovoltaic and fuel cell applications using reverse blocking IGBTs. In 2007 IEEE Power Electronics Specialists Conference. https://doi.org/10.1109/PESC.2007.4342251

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.

Assessing the benefits of installing energy storage in a household equipped with photovoltaic panels
Conference Proceeding
Klumpner, C., & El Boudali, A. (in press). Assessing the benefits of installing energy storage in a household equipped with photovoltaic panels.

This paper evaluates the technical and financial impact of installing energy storage in a house equipped with Photovoltaic (PV) panels subject to the Feed-In Tariff (FIT). An additional benefit of installing energy storage is the possibility to purch... Read More about Assessing the benefits of installing energy storage in a household equipped with photovoltaic panels.

A power electronic controlled dump load with negligible harmonics for accurate loading used in testing small wind turbines
Conference Proceeding
Klumpner, C., Al, B., & Hann, D. B. (in press). A power electronic controlled dump load with negligible harmonics for accurate loading used in testing small wind turbines. In 2010 IEEE International Symposium on Industrial Electronics. https://doi.org/10.1109/ISIE.2010.5637240

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.