Speed control with incremental algorithm of minimum fuel consumption tracking for variable speed diesel generator

Abstract A method of variable speed control system for turboprop engine is presented in this paper. Firstly, the steady operation state of turboprop engine is analyzed, and the operating line is figured out in the steady state characteristic diagram, which is the design basis of Engine Thrust Management System (ETMS). Secondly, the reference model sliding mode multivariable control is used to design the control law to follow the speed instructions given by ETMS. Finally, the optimization of the minimum fuel consumption operating curve is realized, and the control system designed is applied to a numerical model of a turboprop engine. The simulation results show that compared with the constant speed control system, the variable speed control system can reduce the specific fuel consumption by 2.37 % on average and 3.1 % in steady state conditions. Furthermore, the method can enable the pilot to manipulate the turboprop aircraft by using only one throttle lever, which can greatly reduce the pilot operation burden.

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Fuel Consumption Estimate Of Variable Speed Diesel-Generator Unit On The Basis Of Matrix Frequency Converter

2019 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) ◽

10.1109/fareastcon.2019.8933948 ◽

2019 ◽

Author(s):

A. Dar'enkov

Keyword(s):

Fuel Consumption ◽

Frequency Converter ◽

Variable Speed ◽

Diesel Generator ◽

Generator Unit

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Study on the Variable Speed Diesel Generator and Effects on Structure Vibration Behavior in the DC Grid

Applied Sciences ◽

10.3390/app112412049 ◽

2021 ◽

Vol 11 (24) ◽

pp. 12049

Author(s):

Quang Dao Vuong ◽

Jongsu Kim ◽

Jae-Hyuk Choi ◽

Jae-ung Lee ◽

Ji-woong Lee ◽

...

Keyword(s):

Fuel Consumption ◽

Air Pollutants ◽

Engine Speed ◽

New Technologies ◽

Fuel Efficiency ◽

Combustion Process ◽

Shipping Industry ◽

Variable Speed ◽

Diesel Generator ◽

Structure Vibration

Global warming and air pollutants are in general major worldwide concerns including for the marine shipping industry. Equipped with new technologies, the onboard DC grid has proven several advantages, including up to 27% reduction in specific fuel consumption with reduced emissions. That can be achieved by installing an optimized variable speed diesel generator. The engine speed is adjusted according to the required power, which allows to always keep the best efficiency of the combustion process. However, it also exposes some changes in the behavior of the structure vibrations. Measurements on an experimental variable speed diesel generator show that vibration increases when trying to slow down the engine for the same load. This behavior is closely related to the resonance in low rev range that usually occurs with general gensets. In other words, we can conclude that the DC grid’s variable speed generator may be beneficial for fuel efficiency, but not for mechanical life and safety. Several measures had been given, of which the alternation of the natural frequency is presented as an economical and efficient solution. The ultimate goal is to maintain operational safety while respecting reduced fuel consumption.

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