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Passive Power Filter (PPF) is widely used in power system because of its advantages in performance-price ratio. For PPF, there are several topologies, each of which has different frequency characteristic. In power system, in order to achieve the certain filtering effect, it is necessary to combine different filter topologies. Currently, the selection of PPF topologies is based on the engineering practical experience of PPF designer. However, there is a lack in systematic design method and scientific design basis. For this reason, this paper, taking the filtering effect and filters cost as the design indices, deeply investigates the selection problem of PPF topologies, and proposes a selection method of PPF topologies. The research results show that the most reasonable combination of different filter topologies can be obtained by this method for different situation needed to mitigate harmonic and compensate reactive power. [ABSTRACT FROM PUBLISHER]

The magnetic suspension ball system is a typical uncertain nonlinear systems, and is the foundation and platform for the study of other complex magnetic levitation system. Recently, new control strategies have been proposed constantly for it. Firstly, this paper analyzes the working principle and modeling methods of the magnetic suspension ball system. Then, this paper introduces several existing control methods of it, analyzes and summarizes the status and characteristics of the various methods. Finally, this paper makes a further analysis of the problems of existing control method, and Investigate the improved control scheme for it. [ABSTRACT FROM PUBLISHER]

The dSPACE is a software and hardware real-time control platform based on MATLAB/Simulink. In this paper, the proportional-integral defferential(PID) position regulator of the servo system is designed and dSPACE single board system DS1103 is used. Adoption of the rapid control prototyping, the control system's simulation model is built in MATLAB/Simulink. The model can be compiled and downloaded to dSPACE real-time hardware system by RTW/RTI. The deviation of servo system movement process can be monitored and the controller parameters can be adjusted online to improve the system's performance with ControlDesk software. The real-time simulation shows that the proposed regulator enables the system to be of excellent follow performances and the method of real-time simulation is simple and the parameters can be revised conveniently. [ABSTRACT FROM PUBLISHER]