Research On Chaotic Motion Analysis And Power Optimization Control In Wave Power Generation System

With the rapid development of the world economy,the demand for energy is increasing rapidly all over the world.Ocean wave energy,as a new energy to be developed,attracts a lot of experts and scholars at home and abroad.The ocean is rich in various forms of energy,and it can provide enough renewable and clean energy for mankind.Wave energy has small amplitude,high energy density and good predictability.It has high development potential and utilization value.Chaos theory is a major discovery and landmark in twentieth Century following relativity and quantum mechanics.Chaos is one of the most basic forms of motion in nature.It is the dialectical unity of certainty and probability.It reveals the complexity of the nature and the human society: unity of order and disorder,the unity of certainty and probability,to a great extent,has opened up people's vision and deepened the understanding of the objective world.Chaos exists in all things of nature,and it can be controlled synchronously.Its theory can be widely applied in various engineering fields.By introducing the basic concept of chaos theory,and using the Wolf method to write the maximum Lyapunov exponent calculation program,and the simulation of chaotic behavior,the existence of chaos in the permanent magnet linear synchronous machine(PMLSM)was verified.According to the basic theory of stability,according to the definition of equilibrium point and from the angle of Lyapunov stability theorem,the inverse design method was designed to solve the chaos control problem of permanent magnet synchronous linear motor.In view of the unknown parameters,an adaptive backstepping chaos control strategy under the decoupling model was proposed,which updated the parameters of the system adaptively,reduced the system's dependence on the parameters,and ensured the stable operation of the permanent magnet synchronous linear machine system.It is possible to use doubly fed induction machine(DFIG)or brushless doubly fed machine(BDFM)as power generation equipment in wave power generation system.And chaos phenomenon is however widespread in all things in nature.DFIG and BDFM were sequentially modeled and analyzed to prove the existence of chaos.The decoupling adaptive backstepping control method was proposed for the chaotic suppression and state tracking of the DFIG system,which can make the DFIG system run efficiently and stably,and the transition process of the BDFM system from the steady state through period doubling bifurcation and the transition of the Hope bifurcation to the chaos was analyzed,in order to improve the BDFM generator system in a wave generation system.It provided a theoretical basis for the safety and stability of the state.Using PMLSM as power generation device,optimal power capture principle of wave generation system was analyzed.A two degree of freedom method was used to construct the maximum power transmission condition.According to the random sea wave,the Fourier analysis method was used to optimize the power,and the back step design method was used to control the state of the motor,and the maximum wave energy acquisition and control of the wave power generation system was realized.