The analyses of the influence of spatial harmonics on the electromagnetic torque of the multi-phase induction machine and reducing this influence are important tasks to ensure the high efficiency of the induction machine. Designing the machine to consider the influence of spatial harmonics is essential to ensure the desired mechanical and energy characteristics. In the case of the sinusoidal winding supply of the induction machine, the magnetomotive force has high spatial harmonics, which are caused by the machine-winding design. The interaction between the 5th, 7th, 11th and 13th spatial harmonics of the winding function and the first time-harmonic of the winding supply causes the appearance of the 6th and 12th harmonics in the electromagnetic torque of the machine. A prototype of the symmetrical six-phase induction machine and the experimental study for the influence of spatial harmonics on the harmonic content of the stator currents in different machine modes are given in this paper. The mathematical model of the six-phase induction machine has been developed using the average voltages in integration step method. The introduction of the harmonic components into the magnetization inductance in the mathematical model of the six-phase induction machine for taking into account the spatial harmonics of the machine-winding function is proposed in this paper. The adequacy of the mathematical model was confirmed by comparing the simulation and experimental results. The harmonic content of the electromagnetic torque, which is caused by spatial harmonic influence, is analyzed.

The article presents the process of discretization and implementation of the Proportional Resonant controller in a digital programmable system of FPGA type. The synthesis of the regulator in a continuous version is presented and on its basis the discretization has been carried out. The digital form of the regulator has been implemented into the FPGA system. The device has been simulated in real time and this paper presents some of the results of this research. Its aim was to evaluate the operation of the regulator in a digital form, prior to the implementation into a real device. The article is a continuation of the research aimed at the implementation of the regulator in the real device. Streszczenie. W artykule przedstawiono proces dyskretyzacji i implementacji regulatora P+R w cyfrowym układzie programowalnym typu FPGA. Zaprezentowano syntezę regulatora w wersji ciągłej i na jej podstawie przeprowadzono dyskretyzację. Cyfrowa postać regulatora została zaimplementowana do układu FPGA. Przeprowadzona została symulacja urządzenia w czasie rzeczywistym a niniejsza praca prezentuje niektóre wyniki tych badań. Jej celem była ocena pracy regulatora w cyfrowej postaci, przed implementacją do rzeczywistego urządzenia. Artykuł jest kontynuacją badań zmierzających do uruchomienia regulatora w rzeczywistym urządzeniu. (Realizacja regulatora Proporcjonalno-Rezonansowego w układzie FPGA)

The paper presents the study of a three-phase system coupling a DC power source to a power grid. This study, based on an FPGA, implements a real-time control system and digital models of the power circuit. The proposed proportional–resonant (P+R) controller with a modified structure was part of the system, which can be used as an alternative controller to traditional ones, e.g., in photovoltaic systems. Due to difficulties in implementing resonant controllers, a P+R with a new structure using a PI controller was elaborated. With an appropriate approach to the generation of phase current patterns, it is possible to set the reactive current and, thus, compensate for the reactive power. The operation of the system for typical operating conditions (e.g., system startup, change in preset load) was characterized and compared with a classical solution using a PI controller.

No abstract

No abstract