Faculty of Engineering


Energy management systems – renewable energy, storage and control

A green energy system, which serves as a micro-grid to power homes and cars, is being designed to harness and integrate renewable energy sources such as solar and wind.

Household renewable energy systems require a very large and expensive energy storage facility in addition to the cost of installing solar panels, wind turbines and associated electronics. The concept is to use an electric vehicle, which already has a powerful battery, not just for mobility but also to supplement existing household energy storage as appropriate. The system, which also allows for the electric vehicle to be wirelessly charged or discharged, can easily be upgraded, and provides for consumers improved versatility and financial viability compared to conventional hard-wired systems.  The technology can also be used for industrial applications.

 

montage Energy management systems – renewable energy, storage and control

Key focus areas/issues


Key objectives of the project are:

  1. To build an efficient energy management system, comprising a Central Control Unit (CCU) and an intelligent - interactive user interface, ensuring an efficient generation of electricity through the use of integrated renewable sources under all operating conditions.
  2. To build a ‘novel and patented’ contactless and bidirectional vehicle-to-grid or vehicle-to-home power interface.
  3. To build a bi-directional power interface for grid connection.
  4. To build a “Green Meter” for providing consumer information regarding on-line tariff rebate calculations, spot electricity pricing, individual contribution to carbon footprint and assistance for decision making with respect to grid-generation versus consumption.
  5. To develop a commercially viable 3kW working prototype system, through integration of all of the above sub-systems.
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Current major developments


The proposed system, as shown below, is a multi-purpose power interface consisting of a bi-directional power module with a grid interface, a web and wireless communication interface, an energy buffer with connection to multiple energy sources and a prototype hybrid plug-in electric vehicle. A novel inductive power transfer interface is used to facilitate contactless and bi-directional power flow between the power interface and electric vehicle while an efficient energy management system (EEMS) is employed to oversee the overall operation of the system with real time monitoring of system variables.

 

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Key achievements


The following working sub-systems have been implemented:

  1. A bi-directional and contactless power interface for charging/discharging EVs.
  2. A bi-directional power interface for grid interface.
  3. A controlled battery storage system.
  4. A communication interface for energy management.
  5. Power conditioning units for wind turbines and solar panels.
     

Key people


Contact


Udaya Madawala
Email: u.madawala@auckland.ac.nz
Phone: +64 9 373 7599 extn 86496

Related publications


The following publications are from relevant research:

Madawala, U. K., Tobias, G., Bradshaw, J. and Vilathgamuwa, D. M.; ’Modelling and Analysis of a novel Cage Induction Generator’, Industrial Electronics, IEEE Transactions on, vol.PP, no.99, pp.1, doi: 10.1109/TIE.2011.2157277, 2011.

Madawala, U. K., and Thrimawithana, D. J.; "A Bidirectional Inductive Power Interface for Electric Vehicles in V2G Systems," Industrial Electronics, IEEE Transactions on, vol.58, no.10, pp.4789-4796, Oct. 2011, doi: 10.1109/TIE.2011.2114312

Jayasinghe, G. S., Vilathgamuwa, D. M. and Madawala, U. K.: ’Direct Integration of Battery Storage Systems in Distributed Power Generation, in IEEE Trans. on Energy Conversion, 2011.

Jayasinghe, G. S., Vilathgamuwa, D. M. and Madawala, U. K.,;’Cascade Multilevel STATCOM configuration for Wind Farms’, in press for publication in IET Transactions on Power Electronics, 2011.

U. K. Madawala and D. J. Thrimawithana, “A multi-source Green Energy system with a novel grid interface,” in Proc. of IEEE Int. Conf. on Sustainable Energy Technologies 2010, 6-9 Dec., 2010, pp. 1-6.

U.K. Madawala and H. Vincenz, “Living and Mobility-A novel multipurpose in-house grid interface with plug-in hybrid BlueAngle,” in Proc. of IEEE Int. Conf. on Sustainable Energy Technologies-ICSET08, 24-27 Nov., 2008, pp. 531-536.

D. J. Thrimawithana and U. K. Madawala, “A novel matrix converter based bi-directional IPT power interface for V2G applications”, in Proc. of IEEE Int. Energy Conf. and Exhibition, 18-22 Dec., 2010, pp. 495-500.

D. J. Thrimawithana, U. K. Madawala, “A contactless bi-directional power interface for plug-in hybrid vehicles,” in Proc. of 2009 IEEE Vehicle and Propulsion Conf., pp. 396-401.

Sharma, R. and Madawala, U. K.: ‘The Concept of a Smart Wind Turbine System’, in Elsevier Journal on Renewable Energy, 2010.

Madawala, U. K. & Thrimawithana, D. J.; "Current sourced bi-directional inductive power transfer system," Power Electronics, IET , vol.4, no.4, pp.471-480, April 2011, doi: 10.1049/iet-pel.2010.0145

Thrimawithana, D. J., Madawala, U. K., and Shi. Y.: ‘Design of a Bi-directional Inverter for a Wireless V2G System’, in Proc. of IEEE International Conference on Sustainable Energy and Technologies (ICSET10), in Sri Lanka, 6-9 Dec., 2010.

Madawala, U. K., Thrimawithana, D. J., Xi, D. and Vilathgamuwa, D. M.: ‘A Model for Multi-sourced Green Energy System’, in Proc. of IEEE International Conference on Sustainable Energy and Technologies (ICSET10), in Sri Lanka, 6-9 Dec., 2010.

Croft, A., Madawala, U. K., Thrimawithana, D. J. and Vilathgamuwa, D. M.: ‘An Integrated Communication System with a Web Interface for Distributed Generation Systems, in Proc. of IEEE International Conference on Sustainable Energy and Technologies (ICSET10), in Sri Lanka, 6-9 Dec., 2010.

Madawala, U. K., Jia, Y., Thrimawithana, and Vilathgamuwa, D. M.: ‘A Wind Generator System with an Integrated Boost Converter’, in Proc. of IEEE International Conference on Sustainable Energy and Technologies (ICSET10), in Sri Lanka, 6-9 Dec., 2010.

Thrimawithana, D. J. and Madawala, U. K.: ‘A Multi-Source Green Energy System with a Novel Grid Interface’, in Proc. of IEEE International Conference on Sustainable Energy and Technologies (ICSET10), in Sri Lanka, 6-9 Dec., 2010.

Jayasingh, S.D.G., Vilathgamuwa, D.M. and Madawala, U.K., 2010. A battery energy storage interface for wind power systems with the use of grid side inverter, 2010 IEEE Energy Conversion Congress and Exposition, ECCE - 2010 Proceedings, art. no. 5618328, pp. 3786-3791.

Jayasinghe, S.D.G., Vilathgamuwa, D.M. and Madawala, U.K., 2010. Grid-side cascade inverter system as an interface for wind energy storage, 2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings, art. no. 5617933, pp 718-723.

Jayasinghe, S.D.G., Vilathgamuwa, D.M., and Madawala, U.K., 2010. A new method of interfacing battery/supercapacitor energy storage systems for distributed energy sources, 2010 9th International Power and Energy Conference, IPEC 2010, art. no. 5697006, pp. 1211-1216.

Jayasinghe, S.D.G., Vilathgamuwa, D.M., and Madawala, U.K., 2010. Dual inverter based battery energy storage system for grid connected photovoltaic systems, IECON Proceedings (Industrial Electronics Conference) art. no. 5675038, pp. 3275-3280.

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