The High-Speed Flywheel Energy Storage System

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Układ wyzwalania bramkowego szeregowo połączonych tranzystorów opis patentowy nr 145921 /

Zgłoszono 27 listopada 1984 r.Zgłoszenie ogłoszono 3 czerwca 1986 r.Opublikowano 31 marca 1989 r.Nr zgłosz. P 250640.Tyt. z ekranu tyt.Dostępny także w wersji drukowanej.Tryb dostępu: Internet

Układ sterowania łączników tyrystorowych opis patentowy nr 151756 /

Tyt. z ekranu tyt.Zgłoszono 24 października 1984 r.Nr zgłoszenia P 250192Zgłoszenie ogłoszono 20 maja 1986 r.Opublikowano 30 marca 1991 r.Patent dodatkowy do patentu: Układ sterowania łączników tyrystorowych : opis patentowy nr 150180 / twórcy wynalazku Stanisław Piróg, Zbigniew Hanzelka, Jacek Seńkowski ; Akademia Górniczo-Hutnicza im. Stanisława Staszica.Dostępny także w wersji drukowanej.Tryb dostępu: Internet

One phase active filter with energy storage for active power surge compensation in feed line

The paper presents a concept of an active filter with energy storage. This solution can be used for the compensation of momentary one phase high power loads with discontinued power consumption (e.g. spot welding machines). Apart from the typical filtering capabilities, the system’s task is also the continuity of the input power from the feeder line and limiting its fluctuation. The proposed by the author’s solution can produce measurable economic benefits by reducing the rated power necessary to energize periodically operating loads and improving the indicators of electrical energy quality. The developed method of active power surges compensation enables a flexible approach to requirements concerning the rated power of the point to which the periodically operating loads with high peak current value are connected. The tests were conducted on a simulation model specially developed in Matlab & Simulink environment, proving high effectiveness of the presented solution

DC-DC boost-flyback converter functioning as input stage for one phase low power grid-connected inverter

The paper treats about main problems of one phase DC-AC microinverters that allow single solar cell to be joined with the grid. One of the issues is to achieve high voltage gain with high efficiency in DC circuit, which is necessary for proper operation of inverter. The operating principles, results of practical implementation and investigations on boost-flyback converter, which meets mentioned demands, are presented. (high step-up DC-DC boost-flyback converter for single phase grid microinverter

Power Supply and Reactive Power Compensation of a Single-Phase Higher Frequency On-Board Grid with Photovoltaic Inverter

The size reduction in on-board apparatuses in flying platforms, ships, and aerospace vehicles can be achieved by increasing the frequency of the on-board grid voltage. In the case of renewable powered platforms, a grid converter is used that has the primary task of feeding the generated energy into the on-board grid. The paper describes the developed control system of the grid converter, which, in addition to transferring the generated power to the single-phase grid, effectively compensates the reactive power occurring in it. The proposed structure of the proportional resonant regulator with finite gain that cooperates with the single-phase grid was discussed. The use of quadrature estimators of voltage and current enabled independent control of the active and reactive components of the current, thus compensating for the reactive power. The proposed control system structure was implemented on the FPGA platform and experimentally tested in steady state and dynamic condition considering grid disturbances and solar irradiance variations

Single-source three-phase switched-capacitor-based MLI

This article proposes a novel three-phase inverter based on the concept of switched capacitors (SCs), which uses a single DC source. A three-phase, seven-level line-to-line output voltage waveform is synthesised by the proposed topology, which includes eight switches, two capacitors, and one diode per phase leg. The proposed topology offers advantages in terms of inherent voltage gain, lower voltage stresses on power switches, and a reduced number of switching components. Additionally, the switched capacitors are self-balanced, thereby eliminating the need for a separate balancing circuit. The proposed structure and its operating principle, the self-balancing mechanism of the capacitors, and the control strategy are all thoroughly explained in the article. The proposed topology has also been compared with some recent SC topologies. Lastly, the proposed topology has been shown to be feasible through simulation and experimentation