Study On Chaotic Mechanism And Oscillation Control Strategy In Power System

At present, the chaos theory has attracted wide attention in the research of nonlinearsystem, its research results in many engineering fields application. In recent years, the issue ofsecurity and stability is the keyproblem in the operation of power system, power system.Thechaotic oscillation will pose a serious threat to the security of the power system, highefficiency, stable operation, and even lead to interconnectedpower.Power system collapsecolumn. With the expanding of the power system, the nonlinear characteristics are moreobvious, in certain parameters and working conditions, possible chaotic oscillationstriggerpower system, external performance for low frequency vibration withoutrules swing.Therefore, control method of chaotic oscillation in power system is important to improve itssecurity and stability. In this paper a simple interconnected two order power system as theresearch object, the chaos control method is studied deeply, and achieved a some of thechaotic oscillation in power system control has theoretical significance and practical value ofthe results. The main research contents are as follows:(1) The first review and summarize the research progress in recent years ofchaos controlmethod and its application, and several heavy control method to compare the description andanalysis of the system;focusing on the current chaotic oscillation in power system controlsome problems and the existing research method, finally points out the main researchdirection of this paper.(2) Starting from the nature and definition of chaos occurs, analyzes the basiccharacteristics of chaos system and introduced several kinds of determining whether a systemhas effectivemethod of chaos.(3) Through the analysis of chaotic model of power system, focuses on the study ofbifurcation and chaos in power system.(4) The mechanism problem for the chaotic oscillation in power system, with the help ofa nonlinear three parameter machine power system model,calculation method using Melnikovfunction of the homoclinic orbit, the critical conditions and parameters of the regional chaoticoscillation in power system, and proves the possibility of small disturbance induced bychaos,the disturbance of the system to generate chaotic oscillations under thecondition of theperiodic load analysis.(5) Aiming at the control problem of the chaotic oscillation ofelectromagnetic powerdisturbance, using feedback linearization based on differential geometry, through strict statetransform and feedback method,the nonlinear chaotic system is linear, and the design of thecontroller for power system. The simulation results show that the control method can effectively reduce the chaos in power system.