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A new sliding mode control for single-phase UPS inverters is introduced based on rotating sliding surface. It is shown that the sliding surface can be rotated in the phase plane in such a direction that the tracking capability of the inverter is improved when it is subjected to load variations. It should be noted that the sliding surface rotation is possible with a time-varying slope which is computed...
Two current-control strategies based on the sliding mode concept have been introduced for a single-phase current-source inverter feeding a resistive load. The first strategy is based on forming a general switching function using the error variables of the inductor current and capacitor voltage. However, it is observed that this control strategy leads to a steady-state error in the capacitor voltage...
A new approach to the sliding-mode control of single-phase uninterruptible-power-supply inverters is introduced in continuous time. A three-level hysteresis sliding function is used to directly control the inverter switches, with the result that a transistor is switched during a half-cycle while it remains either on or off during the other cycle. An expression is derived for the predicted switching...
A new control strategy for three-phase current-source inverters is proposed based on a model of the converter in the rotating dq frame. The control equations are derived by making use of Lyapunovpsilas direct method. It is shown analytically that a globally stable operation is possible for the closed-loop system. The amplitude of the dc current is adjusted by employing a proportional-integral regulator...
An optimal control strategy based on the linear quadratic regulator approach is proposed for single-phase uninterruptible power supplies in continuous time. The objective of the controller is to achieve a fast transient response, good voltage regulation, and low total harmonic distortion of the output voltage under linear and nonlinear loads. It is shown that these objectives can be met provided that...
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