This paper presents the analysis of a current control system to PMSG in overmodulation region. A detailed review of the space vector modulation in overmodulation region is initially presented. Then, an antiwindup method for current controller of PMSG is proposed. The equilibrium points of the closed loop system are calculated and an estimation of the region of operation with guaranteed stability is determined using linear matrix inequalities. Simulation results are presented and illustrate suitable closed loop performance.
-This paper addresses the design of robust PI controllers for permanent magnet synchronous motors in terms of a linear matrix inequality based problem. A polytopic model of the plant is obtained and validated for the motor uncertain parameters belonging to intervals. The design procedure proposed here encompasses: i. suitable plant uncertainties inclusion and the use of practical design control constraints; ii.robust PI computation based on linear matrix inequalities with a very fast solution; iii. simulation analyses; and iv. experimental evaluations. The robust PI controller can produce superior speed regulation than a PI controller designed only for the nominal parameters, including better disturbance rejection and H ∞ performance. Experimental results confirm the viability of the proposal, which can be seen as an efficient alternative to trade off performance and robustness for PI controllers in this application.
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