The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
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...
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...
This paper proposes a passivity-based controller for a single-phase PWM current-source inverter feeding a resistive load. The controller design is based on the dynamic model of the inverter and the energy shaping plus damping injection idea of the passivity-based approach for a known resistive load case. It is shown that the unknown load resistance can be estimated by an adaptive estimation algorithm...
This paper proposes fuzzy moving sliding surface (FMSS) approach to the hierarchical sliding mode control (HSMC) for a class of second-order under-actuated systems. The HSMC design is based on using separate first-level sliding surfaces for two subsystems that are combined in the second-level comprising a unique control input for both subsystems and therefore, it necessitates several design parameters...
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...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.