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In this paper, a voltage controller is proposed and implemented for grid-connected inverters based on H∞ and repetitive control techniques. A frequency adaptive mechanism is introduced to improve system performance and to cope with grid frequency variations. The repetitive control, based on the internal model principle, offers excellent performance for voltage tracking, as it can deal with a very...
In this paper, a robust control strategy for uncertain nonlinear continuous-time plants with disturbances and state delays is proposed. The strategy is based on the uncertainty and disturbance estimator (UDE). Both cases with known and unknown delay are considered. In the case of an unknown time delay, the term with the delay is treated as an additional disturbance to the system. Both nonlinear and...
In this paper, necessary and sufficient conditions for the approximate controllability of a large class of neutral systems in reflexive Banach spaces in investigated. The approach is based on the transformation of such systems into appropriate boundary control systems.
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