Nonlinear Dynamics In Power Electronics Development,

Nonlinear dynamics in basic power electronic circuits is investigated in this thesis. Based on the limitations of the previously established classic model, a new approach of discrete-time modeling method is adopted. This model is successfully used in close-loop regulator system. Dynamic behaviors of regulators with different control loop designs are studied. The compensators studied are proportional, integral, proportional-integral, proportional -integral-derivative feedback controllers. Bifurcation and chaos behaviors are presented with the voltage controlled converter. Their influence on stability is analyzed.The interactions of input filters with DC-DC regulators are investigated as well. The widely used small-signal averaged model does not provide complete understanding of the stability.In the condition of high-voltage, heavy-current and high-frequency electric circuit there is a certain difficult to inspect and supervise the electric circuit. On introducing a new method of complexity measure analysis, the authors manage to inspect the circuit fault status by analyzing synthetic signal. Compared with the traditional method, the present method has the advantages of high speed, easy operation, less expenses, safety, no destruction, etc. and can be used as a reliability predicting measure for electric circuit system.OGY method is applied to control the chaos exhibited by current-mode controlled boost dc-dc converter, as its chaotic regime has been established in this paper. This is achieved by using discrete-time model and making simplification of the control loop design. Both simulation and experimental work are done. Stability of the circuit is obtained, so that this control method proves to be valid in controlling switching circuit.