Adam Gulczyński

AC/DC/AC Converter with Power Electronics Current Modulator Used in DC Circuit for Renewable Energy Systems

In this chapter, the elaborated structures of the main circuit and control system of a power electronics AC/DC/AC converter, working as a coupling between the energy grid and a water turbine with an electric machine, are described. In aiming to ensure the high efficiency of this system, input and output converters with sinusoidal current were implemented. The input AC/DC converter is based on a diode rectifier with a power electronics current modulator in the DC circuit, while the output circuit is based on a transistor inverter. This solution is dedicated to high power systems. The chapter also presents an MPPT algorithm, which is elaborated and used to control the DC/DC converter. The chosen simulation and experimental results of the research is analysed.

Current control of voltage source inverter with unipolar double frequency PWM

This paper presents a control method for current controlled voltage source inverter (CC-VSI) with output L filter. The new algorithm determines the optimum duty cycle for each modulation period. The duty cycle minimizes assumed quality function. The quality function is the integral of the absolute value of the difference between the reference waveform and the waveform resulting from the differential equations describing the inverter. The advantage of the regulator algorithm is that it has one parameter that needs to be tuned. Moreover, the analysis of the conventional inverter using unipolar double frequency pulse width modulation (PWM) switching schemes is done. Finally, simulation and experimental results on a 500 W current source are conducted to validate the effectiveness of the proposed solution.

Model and research of power electronics solar converter working with power grid

In this paper a single phase grid-connected photovoltaic converter with maximum power point tracking algorithm is presented. This system is characterized by high efficiency and good output quality parameters of electrical energy. The implemented output inverter operates in current tracking controller mode. The output current (current of grid) is almost sinusoidal and the reactive power is equal to zero. Particular attention was paid to the MPPT algorithm. Its task is to ensure that the operating point PV cells to follow the maximum power point, depending on system conditions. Also, some results of simulation and experimental research of elaborated solar system was presented.

Simulation and experimental models of power electronics solar converter working with power grid

In this paper a single phase grid-connected photovoltaic converter with maximum power point tracking algorithm is presented. This system is characterized by high efficiency and good output quality parameters of electrical energy. The implemented inverter operates in current tracking controller mode. The output current (current of grid) is almost sinusoidal and the reactive power is equal to zero. Particular attention was paid to the MPPT algorithm. Its task is to ensure that the operating point PV cells to follow the maximum power point, depending on system conditions. Also, some results of simulation and experimental research of elaborated solar system was presented.