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There are more chaos phenomena in Boost circuit, which make the system working in the unsteady state frequently. As the final control signal, the change of duty cycle reflects the stable operating characteristics of Boost circuit. Based on the continuous conduction mode (CCM) of Boost circuit, the duty cycle criterion of circuit stability is deduced, and the change characteristics of duty cycle are studied, the basic principle of resonant parameter perturbation control is analyzed in this paper. With the mathematical model of Boost circuit, the characteristics of resonant linear parameter perturbation modulation and sinusoidal parameter perturbation modulation are analyzed while the stability criterion is satisfied and dissatisfied, and it provides the feasible strategy and the method for Boost circuit stability design and control.

Adding-weight one-rank local-region method makes too many computations and cumulative errors while carrying out multi-step predictions, an improved adding-weight one-rank local-region forecasting model is presented in this paper. According to the prediction effectiveness of Euclid distance between two points away from prediction point in phase space, and synthetically taking into account the effect of distance and degree of incidence between nearest neighbor points and prediction point, an improved prediction is maken with weighted evolution of the neighbor points historically and the evolution of the center reference point to forecast next point directly. The results show that the improved model for short-term load not only reduce forecasting error, but also improve calculation speed. It is a novel prediction method for chaotic time series, and worth to be studied deeply.