This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Comparison of the Transient Response of Two and Four Stroke Diesel Powered Generator Sets
Annotation ability available
Sector:
Language:
English
Abstract
The response of two and four-stroke diesel powered electric generator sets to transient loading was investigated. The effects of addition and removal of load on generator output voltage and frequency were determined for comparison of the transient response characteristics of two-stroke diesel-generator sets operating at 1200 and 1800 rpm, and a four-stroke diesel-generator set operating at 1800 rpm. Three engine-generator sets of approximately 55 KWe capacity, representing a cross-section of the many available, were connected to a load cell used to instantaneously change the load on the diesel generators. Instrumentation was provided to record output frequency and voltage, electric power, and instant of load change (current monitor). Maximum steady state load was established for each engine-generator set, and the load was changed in increments of this maximum, from various steady state base loads. The time required for the frequency to return to steady state, and the magnitude of the maximum frequency deviation resulting from a load change were determined, and compared for the three generator sets.
The response time (time to return to frequency stability following a load change) was found to be the shortest for the 1800 rpm two-stroke generator set, and longest for the 1800 rpm four-stroke set, with the response of the lower speed two-stroke set in between. The response time of the four-stroke set was two to three times as long as that of the generator sets equipped with two-stroke engines. Response times for all the generator sets increased, as the magnitude of the load change increased, up to a point, and thereafter remained relatively constant with load change. The relationship among the generator sets' response times held over the entire range of load additions and removals, as well as for all base loads from which the load changes were initiated.
Maximum frequency deviations resulting from a load change were dependent upon the response rates of the engines' governors, and were determined to increase linearly with the magnitude of load change. The low speed (1200 rpm) two-stroke generator set experienced the largest frequency deviations, whereas the deviations of the other two sets were approximately the same with the high speed (1800 rpm) two-stroke having a slight advantage.
Output voltage deviations resulting from a load change were found to be negligible over the entire range of base loads and load changes investigated.
Recommended Content
Technical Paper | Development of a Mobile HVAC System for Operation with Engine Off |
Technical Paper | Modeling, Control and Analysis of Mover for an Electric Transmission System of Tracked Vehicle |
Research Report | The Challenges of Vehicle Decarbonization |
Authors
Citation
Lalk, T. and Willett, K., "A Comparison of the Transient Response of Two and Four Stroke Diesel Powered Generator Sets," SAE Technical Paper 810920, 1981, https://doi.org/10.4271/810920.Also In
References
- Ghuman A.S. Iwamuro M.A. Weber H.G. “Turbocharged Diesel Engine Simulation to Predict Steady-State and Transient Performance.” ASME Paper No. 77-DGP-5 September 1977
- Ledger J.D. Walmsley S. “Computer Simulation of a Turbocharged Diesel Engine Operating Under Transient Load Conditions.” SAE Paper NO. 710177 1971
- Benson R.S. Ledger J.D. White-house N.D. Walmsley S. “Comparison of Experimental and Simulated Transient Responses of a Turbocharged Diesel Engine.” SAE Paper No. 730666 1973
- Wallace F.J. Hargreaves M.R.O. Bowns D.E. Cave P.R. “The Differential Compound Engine-Part 2: Transient Response of the Differential Compound Engine (DCE) Compared with Conventional Turbocharged Engines.” SAE Paper No. 750722 1974
- Winterbone D.E. Benson R.S. Morimer A.G. Kenyon P. “Transient Response of Turbocharged Diesel Engines.” SAE Paper No. 770122 February 1977
- Winterbone D.E. Benson R.S. Mortimer A.G. Kenyon P. Stotter A. “Transient Response of Turbocharged Diesel Engines.” SAE Paper No. 770122 1977
- Ledger J.D. Benson R.S. Furukawa H. “Improvement in Transient Performance of a Turbocharged Diesel Engine by Air Injection into the Compressor.” SAE Paper No. 730665 1973
- Watson N. Marzouk M. “A Non-Linear Digital Simulation of Turbocharged Diesel Engines Under Transient Conditions.” SAE Paper No. 770123 1977
- Winterbone D.E. Thiruarooran C. Wellstead P.E. “A Wholly Dynamic Model of a Turbocharged Diesel Engine for Transfer Function Evaluation.” SAE Paper No. 770124 1977
- Willett K.R. “Comparison of the Response of Two and Four-Stroke Diesel Generator Sets to Transient Loading, ” Master of Science Thesis, Department of Mechanical Engineering, Texas A&M University 1979
- “Generator Set Governors Precise Power and Parallel Applications.” Woodward Governor, Bulletin No. 25062
- “Analytic Representation of Mechanical-Hydraulic and Electro-Hydraulic Governors.” Woodward Governor, Bulletin No. 25067
- “The Control of Prime Mover Speed, Part 1 - The Controlled System.” Woodward Governor, Bulletin No. 25031
- “The Control of Prime Mover Speed, Part 2 - Speed Governor Fundamentals, ” Woodward Governor, Bulletin No. 25031
- “The Control of Prime Mover Speed, Part 3 - Parallel Operation of Alternators.” Woodward Governor, Bulletin 25031
- “The Control of Prime Mover Speed, Part 4 - Mathematical Analysis.” Woodward Governor, Bulletin 25031