Research On Control Of Twin-Engine Power System

With multi-engine the power system can enhance its performance and has more reliability, i.e. if one engine of the power system does not work the whole system will not lost its power. But multi-engine power system makes the system more sophisticated and makes its analysis, design and control more complex. According to the project's requirement, this paper studied a control problem of a power system, which equipped with two special two-stroke piston gasoline engines, i.e., twin-engine power system. Twin-engine speed control and regulation is the main objective of this project.The twin-engine power system model was constructed for theoretical research. According to the properties of the power transmission system, a power model was presented through theoretical analysis and experiments. Based on the experimental data of a two-stroke gasoline engine, a steady-state torque model was established by mathematical tool of stepwise regression. The established engine model provided a basis for research of drive-train system and automatic control of engine. The whole model of the objective system was verified by Matlab/Simulink.It's needed to keep the engine speed constant and the controller must be robust. A method for designing robust proportional-integral (PI) controller was presented. The problem of parameter designing of the robust PI controller was solved with linear matrix inequalities approach. According to the properties of researched system, the engine Takagi-Sugeno models were approached using sector nonlinearity. A nonlinear speed controller was developed, and a system augmented method was used for design of engine speed control algorithm without steady-state error. The stability conditions were derived using Lyapunov approach, and the problem was formulated as linear matrix inequality problems. Simulation results attested to the properties of these methods.Twin-engine power control strategies were researched through a self-constructed hardware-in-the-loop simulating platform. By simulating on the simulating platform, a suitable control strategy was confirmed to reduce the experimental cost, and shorten the development cycle.Based on 16bits embedded microcontroller, the circuit of control and data sampling was designed. The control strategies were realized through software, and the designed controller can control the engine remotely. In order to control engine automatically, an engine throttle control system was researched. An adaptive impulse PID controller for throttle was presented, by which an exact position control was achieved. Based on Visual Studio/C++ platform, a ground monitoring system was developed, and on which the obtained data could be displayed and saved in real time.In order to testify the efficiency of researched control strategies, experiments on real power system were delivered through designed controller. During experimenting, the designed controller could track the reference speed and keep the engine speed fluctuating under permitted range. Under the close-loop control the throttle responds quickly while the load demand was changed. The satisfactory control results were achieved.