Michal Krystkowiak

Control system of power electronics current modulator utilized in diode rectifier with sinusoidal source current

In the article a structure of control circuit of power electronics current modulator, connected to DC circuits of diode rectifiers, is presented. This solution is very attractive in case of large power rectifiers due to obtaining close to sinusoidal power grid current and relatively low modulator power. The criterions of parameters selection of control circuit are described. Selected results of simulation researches are presented also.

Simulation and experimental models of 3-phase diode rectifier with power electronics current modulator

In this paper the structure of control system of power electronics current modulator is presented. This converter is placed in output circuit of 3-phase diode rectifier. With aid of such solution, power grid current of decribed rectifier is almost sinusoidal. Different structures of current regulator - part of control circuit - are considered. Chosen results of simulation and experimental researches are presented also.

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.

Analysis of electromagnetic phenomena in the two-winding permanent magnet synchronous generator

The paper deals with the analysis of electromagnetic phenomena in a two-winding permanent magnet synchronous generator (PMSG) driven by wind turbines. The machines winding is designed to facilitate application of a low cost and reliable AC/DC power electronic converter. The finite element method has been employed to develop numerical models for the case study problem of the machines. Special attention was paid to the comparison of torque waveforms and core losses in the proposed and reference, sinusoidal loaded machine with a typical design of a winding.

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.