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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...
This paper proposes a passivity-based control (PBC) strategy for single-phase pulsewidth-modulated current-source inverters feeding a resistive load. In this strategy, it is required to estimate the load resistance and the inductor-current reference. However, the estimation accuracy depends on the inductance value when the load resistance and the inductor-current reference are estimated using an existing...
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...
This paper proposes a nonlinear control strategy for single-phase PWM current-source inverters based on Lyapunov's direct method. The main idea in this method is to form an energy-like Lyapunov function in terms of the inverter system states and then determine the control strategy that makes the time derivative of the Lyapunov function always negative for all values of the states. It is shown that...
A new current control strategy is proposed for the control of three-phase three-wire shunt active power filters. In this strategy it is sufficient to measure the source voltage and the load currents. Analyses of the balanced nonlinear and unbalanced linear load cases are performed. Simulations are performed for these cases as well as for a nonlinear load drawing quasi-square-wave currents from the...
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...
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