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CASCADE STATE CONTROL OF ROBUST AC-DRIVES
R.Schonfeld,D.H.Dat,H.Lorenz,Ng.Ph.Quang 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
Powerful processors enable to use the state-control in practical applications. To control AC-Drives, the cascade state control is used (Fig. 1) ?<br/> The torque proportional current component is the output value of the outer control loop and the leading value of the inner control loop. This signal is limited. The advantages of this structure, compared to traditional controlmethods are<br/> - very fast torque inpression, based on current-state-control<br/> - robustness against changings of rotor flux coupling<br/> - torque control in the full range of torquelimitation<br/> - aperiodic motion control via an elastically coupled mechanical transmission system<br/> - limitation of the application of sensors by use of state- and disturbance-observers<br/> - robustness against parameter-changings and nonlinearities of the mechanical transmission system<br/> - use of an effective selfcommissioning strategy under respect of the laws of matrix-algebra<br/> - use of an unificated hardware and a unificated software structure for induction motors and synchronous motors<br/> The theoretical analysis is based on discrete state equations. The discretisation of the state equations is combined with a linearisation of the problem. We get useful algorithm to adapt the controllermatrix to the observermatrix automatically.<br/>