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In this paper is presented a control method for single phase inverters connected to grid for wind turbines, using closed loop. This method of control is based on output voltage monitoring and as a result, generates a reference voltage for comparison. After comparison a PWM (Pulse Width Modulation) signal is generated for control of the single phase inverter. The output voltage will be the same frequency as the grid. For design validation, simulation results will be presented for different PWM frequencies.

The paper describes aspects regarding an E-learning approach of resonant ac inverters. The learning process is based on "Learning by Doing" paradigm supported by several learning tools: electronic course materials, interactive simulation, laboratory plants and real experiments accessed by Web Publishing Tools under LabVIEW. Built on LabVIEW and accompanied by a robust, flexible and versatile hardware, the experiment allows a comprehensive study by remote controlling and performing real measurements on the inverters. The study is offered in a gradual manner, according to the Leonardo da Vinci project EDIPE (E-learning Distance Interactive Practical Education) philosophy: theoretical aspects followed by simulations, while in the end the real experiments are investigated. Studying and experimenting access is opened for 24 hours a day, 7 days a week under the Moodle booking system.

In this paper a new PWM switch model including conduction losses, for Discontinuous Inductor Current Mode (DICM) dc-dc converters is developed. Compared to other models for DICM, the proposed model is more accurate, its derivation considering the correct, exponential waveforms for the currents and voltages. The proposed model is verified through PSpice simulation. A possibility of simplifying the model is also presented and verified through PSpice simulation.

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