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A predictive estimation based control strategy for a quasi-resonant dc-link inverter

Turzyński M., Banach P., Murawski P., Pepliński R., Chrzan P. J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2013

Vol. 61, nr 4

757--762

Control of parallel quasi resonant dc link inverters (PQRDCLI) is usually based on dc link input inverter current. Instead of a direct measurement of this noise sensitive and fast changing current signal - its estimation with one step prediction may be considered. Estimation of an input inverter current is based on inverter output current measurements, applied in most of power electronics controlled ac drives. In this paper, the PQRDCLI fed induction motor (IM) with a predictive current estimation stabilizes resonant inverter output voltage slopes du/dt independently of load. By control of output voltage derivatives, reduction of overvoltage spikes and common mode motor currents is achieved. An analysis of the PQRDCLI control with a predictive current estimation strategy is verified by the Saber system simulation and experimental tests in a laboratory setup.

The information base on surveying services for investments - methodological issues concerning creation of dictionaries and queries

Kowalski R., Zaczek-Peplińska J., Pepliński R.

Reports on Geodesy

2005

z. 3/74

283-292

The initial concept of the Information Base on Surveying Services for Engineering Investments, presented during the Conference "Geoinformation in Poland" in Warsaw, 2004 resuIted in high interest of experts dealing with geographic information systems, in their wide context. According to authors' intentions, the proposed information base, is to store information concerning tasks implemented in relation to surveying services performed for the needs of building objects. Its basic objective is to present the field of engineering geodesy for the needs of didactic tasks, as well as to distribute proper standards of surveying works. The basic issue, which occurs during development of database structures for data collection, is determination of a set of parameters, which are common for various engineering objects and which allow to search for data following queries asked by the user. Grouping of objects according to their basic features, related not only to object geometry or functionality, but also to surveying works performed during object implementation and exploitation, as well as to developed documentation, is the basic condition of efficient searching and presentation of data. This issue focuses on unification of an object description and development of appropriate dictionaries. The issue of identification of an information unit in the information base will be described in the paper using the example of settlement of surveying services elements due to diversification of objects it is difficuIt to define and distinguish particular works performed by a surveyor; therefore there is no simple opportunity to compare surveying works performed in the course of object implementation.