Modeling and control of a marine diesel engine driving a synchronous machine and a propeller

Abstract

In some designs of power systems for marine vessels, large-size or medium-size Diesel engine(s) is(are) used to drive one synchronous machine to generate electricity, and the main propeller, simultaneously, through a gear box. Such systems are subject to disturbances that may affect performance and fuel consumption. The most important disturbances occur due to the propeller torque, and load demand on the electric network. In this work, a simplified state-space model is suggested for such systems based on well known models of each component. The model considers the dynamics of the shaft, Diesel engine, and synchronous machine with the propeller in their simplest models. The output voltage and torque coefficient were modeled as uncertain parameters. Then, exploiting feedback linearization, two controllers were suggested for the proposed model to regulate the rotational speed of the shaft. Firstly, by pole placement. The second is a robust controller by mixed H 2 /H ∞ synthesis. The results of the simulations of the proposed controller are presented and compared.

Concise Robust Control of Marine Engine Speed Based on Backstepping and Its Fuzzy Comprehension

“…This study is to design speed regulation controller for large low 2 Complexity speed marine engines, such as MAN B&M S60M. The second order dynamic model can be described as follows [8,10,11].…”

“…Substituting (16) into (18), the control law is transformed as follows: (20) Substituting (8) into (20), the actual control law was deduced, if…”

“…An improved PID tuning method was proposed for marine diesel engine governors to overcome load fluctuation due to weather and sea conditions [1]. In order to improve the robustness of ship engine speed control, active disturbance rejection controller was presented in [2,6], and robust control method was recommended in [7,8]. To optimize the control parameters, several intelligent algorithms have been used to achieve better control performance, such as fuzzy logic comprehension [3,4], GA optimization [5], and Neural Network adaption [9].…”

Control-Oriented Model of a Generating Set Comprising a Diesel Engine and a Synchronous Generator

“…Further, the model proposed for the dynamics of the terminal voltage may not be adequate for such purposes. The current authors proposed a model for the Genset that has a propeller in addition to the engine and the machine in Tuffaha and Gravdahl (2014). However, Tuffaha and Gravdahl (2014) used the flux linkage as a state variable which is usually difficult to be measured.…”

“…The current authors proposed a model for the Genset that has a propeller in addition to the engine and the machine in Tuffaha and Gravdahl (2014). However, Tuffaha and Gravdahl (2014) used the flux linkage as a state variable which is usually difficult to be measured. Besides, they used the first-order model of the Diesel engine in Fossen (1994) that uses the fuel rack input to manipulate the torque, without taking in consideration the air dynamics.…”