Papers by Keyword: Bode Diagram

Abstract: In order to achieve a proper design and control, it is necessary to have an exact model of boost converter. In this paper, the mathematic model of boost converter is proposed by the state-space average method. In the next step, the open-loop transfer function model without compensation is deduced in detail according to the mathematic model of the boost converter, the controller is designed according to frequency domain. The phase margin and magnitude margin of the open-loop system of the boost converter with compensator have both been increased. After compensating, the control system becomes stable. Using Matlab 7.1, the simulation of the control system of boost converter was implemented. The simulation results of control system confirm that the controller can reduce steady state error and resist power supply disturbance.

Abstract: A dual-loop (inner current loop and outer voltage loop) control scheme for micro electric source inverters in microgrid is improved in this paper. In order to make dual-loop control analysis more accurate, LC filter, SVPWM module equivalent are included in the inverter supplied system model. Based on the fully decoupled dq axis model,the PI controller are used in both inner current loop and outer voltage loop. The inner current loop is designed with engineering algorithm and the outer voltage loop with bode diagram and step response. The simulation results show the validity of the designed control in that the proposed design methodology not only enhances steady state performance of the system, improves the voltage quality but also enables the current limiting.

Abstract: Through the analysis of Permanent Magnet Synchronous Motor (PMSM) servo system, this paper is aimed to deduce the transfer function model of position output caused by the disturbance input, using the Matlab software for simulation calculation, and to analyze the change of the Bode diagram of the disturbance model when the control system parameter value changes. In addition, based on the analysis, the paper will identify the influence law of the external disturbance at different frequencies on the system servo stiffness. The simulation and analysis will show that adjusting the certain control system parameters can improve the system servo stiffness at different frequencies of the external disturbance.

Abstract: In this paper, an applied classic control theory is adopted for the dynamics analysis for the electro-hydraulic servo drive device in which lower-powered integrative base on Matlab. The concrete measures are carried out to improve the dynamics of the system.