Research On Chaos Control Of Turbo-generator Set On Parallel Operation

At present, the generator in parallel operation widely used in the ship power station, the generator as an important equipment of ship power system is difficult to control. In a nonlinear dynamic system, chaos oscillation as a special kind of running state, more and more be taken seriously. Chaos oscillation phenomenon is mainly encountered in the operation of the ship power system, a large number of similar random, sudden or paroxysmal power system oscillations. The oscillation process has no fixed cycle, it for safe operation of power system is a great threat, may cause the unstability of the system. This paper first discusses the basic characteristics of chaos, then analyses the nonlinear power system, further studies the robust controller design. The study found that we can use a nonlinear robust controller to control the steam turbine generator in parallel operation of chaos phenomenon. Concrete has carried out the following research work:First of all, through the analysis of synchronous generator model of ship power system,we can get the single turbo-generator set in the power system, the adjusting valve control system state equation, and the mathematical model of excitation system. Determine the mathematical model of single ship power system combining parallel, then coupling relationship between voltage and current, and load current relationship, determine the turbo-generator set nonlinear mathematical model of two parallel machine.Second, to analyse the chaos oscillation in ship power system, using Lyapunov index analysis method. Through calculating spectrum Lyapunov index as a criterion of the power system chaotic behavior. According to the nonlinear model of ship power system, join a periodic disturbance in the model, analysing when the disturbance power and disturbance amplitude in the system changes, to observe the value of index in the spectra, concludes that system in the condition of chaos, and then further analysis for different disturbance amplitude value, the steam turbine generator set Angle and rotational speed waveform diagram and system phase diagram of the graph, then analyzes their graphics. Finally verify the validity of the index analysis, it is concluded that the chaotic oscillation phenomenon in a steam turbine generator set parameters, provided the prior condition for the research of chaotic control.Again, in this paper, through the establishment of electric power system of ship nonlinear mathematical model, and based on the direct feedback linearization method and the nonlinear robust control theory, design a nonlinear speed and voltage regulator, a mathematic model of the unity of the steam turbine unit, and through the simulation to observe the control effect.Based on steam turbine generator set two parallel machine phenomenon of chaos, this paper uses the Matlab software to realize the ship power system analysis and simulation,through the simulation results, getting the conditions of chaos phenomenan that exist in the ship power system,through the design of the controller to suppress chaos phenomenon,and verify the validity of the designed controller.