Mao Jingfeng

A Variable Structure Robust Control Method in SVC Application for Performance Improvement

For solving power system nonlinear and multi-objective control problems, a variable structure robust control design was presented for a static VAR compensator (SVC). The controller for the nonlinear system was designed using variable structure control theory, robust control theory and direct feedback linearization technique. Firstly, the nonlinear model of a single-machine infinite-bus system including SVC with uncertainties was analyzed. Then based on the method for constructing sliding mode hyperplane with the solution of the algebraic Riccati equation of normal system, a variable structure robust control algorithm was carried out. The proposed controller can improve power angle stability of power system and ensure local voltage quality. The control law has simple structure, strong robustness, and easy to realize. Finally, the simulation results verify the validity of the proposed approach.

Research on the switched reluctance motor for ISAD system for vehicle based on DSP and CPLD

This paper introduces switched reluctance motor (SRM) for ISAD system for vehicle based on DSP and CPLD. Io this system, the switched reluctance motor is used as a type of integrative device which realize the conversion from mechanistic energy to electric energy or conversely, and the digital controller based on digital signal processor (DSP) TMS320F240 and complex programmable logic device (CPLD) EPM7128S is designed. The system applies to hybrid electric vehicle (HEV) to realize starting, generating and assistant propulsion. The control strategies of ISAD is that: getting the max electromagnetic torque is the aim at starting; the most highest efficiency is the aim during the process of assistant propulsion; at generating, according the energy of storage battery, the system could automatically select constant voltage charging, constant current charging and floating charging. Using of CPLD obviously simply the exterior circuit and improves the reliability of ISAD system. In this paper, the operation principle of SRM in all kinds of operation state and relevant control arithmetic and program flow of DSP. Finally, based on a machine of 3 KW six-phase 12/10 discal SRM, the result of simulation and experiment is presented. The experiment results indicate that the scheme of SRM ISAD system for vehicle is feasible and digital controller based on DSP and CPLD has fine effect.