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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 approach to the sliding mode control of single-phase UPS inverters is introduced in continuous-time. A three-level hysteresis switching function is used to directly control the inverter switches. The theoretical and predicted switching frequency expressions are given. The performance of the proposed control method has been tested through computer simulations using different loads (a load which...
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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