Analysis And Control Of Ferromagnetic Chaotic System Of Transformer

The dynamic behavior of the power system involves complex nonlinear phenomena.Power transmission and transformation system contains a large number of inductive and capacitive components, when in some conditions may occur when the ferromagnetic resonance,hazardous to the safe and stable operation of the power system. In this paper, a ferromagnetic chaotic system of transformer is studied, and its dynamic behavior is analyzed in detail. It shows that the system has chaotic oscillation under certain parameters and generates overvoltage. And on this basis, the method of suppressing the ferroresonance overvoltage of the system is studied.First, on the basis of a transformer ferromagnetic resonance system, this third-order nonautonomous system is transformed into a fourth-order autonomous system by adding a time dimension, using the phase plan, the Poincare section, the Lyapunov index, The results show that the influence of the system parameters on the dynamic behavior of the system can be obtained, and then the concrete parameters of the chaotic state and periodic state can be obtained. Finally, the MATLAB simulation model To assess the correctness of the results obtained.Then, in order to effectively control the system under the chaotic state of the ferromagnetic resonance overvoltage, the system uses a fuzzy control strategy to suppress its chaotic behavior.On the basis of deep understanding of the fuzzy control theory, the design of the fuzzy controller is completed and the numerical simulation is carried out in MATLAB. Through the comparison and analysis of the simulation waveform, it is found that the control method can suppress the overvoltage to a certain extent, but its voltage waveform can not fully meet the sine wave.Finally, the ferromagnetic resonance overvoltage of the system is suppressed by combining the fuzzy control theory with the delay feedback control strategy. In the design of the delay feedback controller, the graduation design mainly uses the regional optimization method to set the delay time, and then uses the calculation system index to extract the feedback factor. At the same time, combined with the fuzzy control, the ferromagnetic resonance system is realized from the chaotic state Transferred to a stable periodic orbit. The simulation results show that the fuzzy control and delay feedback control combined with the control strategy, the system of ferromagnetic resonance over voltage phenomenon has a very good effect.