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Facu
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f Sci
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, Eng
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yThis presentation will discuss: Intro | Centre for Renewable Energy and Power Systems King Island Renewable Energy Integration Project Renewable Ready Pty. Ltd.
1. Four Common Diesel Myths
2. Low Load & Variable Speed Diesel
3. Hybrid Diesel Power System Modelling
4. Economic Modelling & Battery Consolidation
5. Operational Experience
Facu
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f Sci
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yThe University of Tasmania Centre for Renewable Energy Power Systems Chair: Professor Michael Negnevitsky
>8 Full Time Academic Staff
>16 Full Time PhD & Masters Students
Unique Facilities include;
• Internet Connected Micro-grid Laboratory;
• Remotely Connected Research Workstations;
• Islanded Diesel Capability; and
• Solar and Wind integrated internal AC Bus;
Faculty of Science, Engineering & Technology
1. Diesel engines are inflexible and unable to operate at low loads.
Modern diesel engines can operate sustainably across their full load range. During sustained operation at low load a purge routine will be required to discharge carbon from the system. One hour every 8 to 12 hours of low load operation is typical.
Diesel Myths
References: E. Surosky, "The Effects of Long Term High Idle Operation on Diesel Engines," Belvoir Research and Development Center, 1983. R. Welz, "Low Load Operation for s1600 gendrive engines," Application Newsletter 15-005, MTU Friedrichshafen 21/04/2015. M. Jensen, “Low Load Operation,” Service Letter SL11-544/MTS, MAN Diesel & Turbo, June 2011.
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Faculty of Science, Engineering & Technology
2. Diesel engines operate inefficiently at low loads..
Fixed speed diesel engines do consume more fuel per kWh at low loads. The solution is to release the engine from the fixed speed environment. Variable speed diesel concepts offer dramatic efficiency gains, and are able to use stock standard diesel engine technologies. It is the generator which requires replacement with either a DFIG or PMG platform to allow variable speed application.
Diesel Myths
References: E. D. H. Wang, C. V. Nayar, and C. Wang, "Modeling of stand-alone variable speed diesel generator using doubly-fed induction generator," in 2nd International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2010, June 16, 2010 - June 18, 2010, Hefei, China, 2010, pp. 1-6.
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Faculty of Science, Engineering & Technology
3. Diesel engine emissions increase at low loads.
Emissions known to escalate at low cylinder temperature and pressure have historically been problematic for low load operation. However, a range of approaches have been demonstrated to offer stable cylinder temperature and pressure under low load operation, mitigating these observations.
Diesel Myths
References: E. Danvest, "CAT PON Performance Test Report 41711," August 2015.
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Faculty of Science, Engineering & Technology
4. Low Load Diesel operation increases engine wear.
Corrosive and mechanical wear mechanisms, historically linked to low load operation, have largely been eliminated in engines configured to maintain optimal cylinder condition across a wide load range. Approaches typically integrate variable engine cooling and variable air charge technologies.
Manufacturers typically warrant a level of low load operation, conditional on the average load profile remaining above a specified average load. The average load threshold is often misrepresented as an absolute load threshold, which is incorrect.
Diesel Myths
References: E. E. D. Tufte, "Impacts of Low Load Operation of Modern Four-Stroke Diesel Engines in Generator Configuration," Norwegian University of Science and Technology, 2014. P. Brooks, "Limitations on low load operation for fixed speed engines," in Cummins marine application bulletin, ed, 2005.
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Faculty of Science, Engineering & Technology
Power System Modelling
Faculty of Science, Engineering & Technology
• LLD transitions isolated power systems from low to medium RE penetration.
• Minimum CoE inflection moved from low to medium RE penetrations.
Economic Modelling & Battery Consolidation
visit www.kingislandrenewableenergy.com.au
Questions Images Courtesy of Regen Group
Faculty of Science, Engineering & Technology
• Variable speed diesel pilots in Nullagine & Broome, Western Australia.
• Variable speed diesel pilots in Pulau Ubin, Singapore, and Uligan, Maldives.
Operational Experience
Faculty of Science, Engineering & Technology
• 60% load acceptance recovery in 4s (120kW -840kW).
• Frequency dip of 2 Hz.
Operational Experience
