This paper deals with photovoltaic converter not including maximum power point tracking (MPPT), but precise active power tracking (PAPT) operational mode. There is considered control deployment for ...boost converter (four-phase interleaved), as an essential part of common two-stage grid-connected photovoltaic system. The control code is developed and tested by means of MATLAB autocoding generation and specially designated embedded oscilloscope functions for DSP, together with Hardware-in-the-Loop emulator device. Described rapid prototyping framework is successfully employed for the unconventional PV control algorithm development.
Power electronics converters are essential and critical components of the new power-systems paradigm where renewable energy sources are expected to play a significant role in the future worldwide ...energy portfolio. In this paper, the flexibility of PV converters is exploited, proposing a novel method for tracking an external power-reference in real-time which generally differs from the maximum power point, taking into account the dynamic constraints of the source given by the external environmental conditions.
У тези je предложен поступак развоја управљачких склопова енергетске
електронике заснован на технологији Hardware In the Loop. Подробно је
описан предложени емулатор са нагласком на специфичном
...моделовању погодном за извршење у стварном времену што је
предуслов веродостојности. Сама веродостојност је проверена
поређењем резултата са симулацијом, као и са измереним резултатима
у неколико стварних погона. Затим је поступак развоја управљачких
склопова подробно објашњен на примеру развоја и испитивања једног
новог контролног алгоритма за повезивање синхроног генератора на
електричну мрежу.
U tezi je predložen postupak razvoja upravljačkih sklopova energetske
elektronike zasnovan na tehnologiji Hardware In the Loop. Podrobno je
opisan predloženi emulator sa naglaskom na specifičnom
modelovanju pogodnom za izvršenje u stvarnom vremenu što je
preduslov verodostojnosti. Sama verodostojnost je proverena
poređenjem rezultata sa simulacijom, kao i sa izmerenim rezultatima
u nekoliko stvarnih pogona. Zatim je postupak razvoja upravljačkih
sklopova podrobno objašnjen na primeru razvoja i ispitivanja jednog
novog kontrolnog algoritma za povezivanje sinhronog generatora na
električnu mrežu.
This paper proposes development of Power Electronics controllers based on
the Hardware In the Loop technology. Proposed emulator is describied in
detail where emphasis was set on specific methods of modeling which is
suitable for real time emulations in order to obtain emulation faithfulness.
Fidelity itself was checked through comparison with off-line simulations and
results of real drives. Procedure of controllers development was presented
through development and testing of one new control algorithm for connection
of the permanent magnet synchronous generator to the electrical grid.
Nove litostratigrafske jedinice na hrvatskoj strani Jadrana su nedavno predložene i usvojene, i trenutno su u uporabi, poglavito u pleistocensko-holocenskom nizu. Tako su u Sjevernom Jadranu prvo ...uvedene dvije nove formacije (Istra i Ivana), a zatim imenovana tri nova litostratigrafska člana unutar formacije Ivana, te predložena promjena naziva formacije Susak. Nadalje, u plitkom odobalju Južne Dalmacije, tj. paleo taložinama rijeke Neretve, imenovana je formacija Neretvanski kanal koja je podijeljena u članove pijesci Neretva i član Malostonski zaljev. Kako je definicija litostratigrafskih jedinica često opisni zadatak, u ovome radu je pomoću algoritma i programskog koda izrađenog u programu za statističku obradu podataka „R“ omogućeno pojednostavljenje tog zadatka na temelju dovoljnog broja izmjerenih vrijednosti šupljikavosti po okomici stijene ili taložne sekvencije. Algoritam izravno određuje način testiranja hipoteza o normalnosti razdiobe šupljikavosti, a programski kod to praktično numerički i grafički rješava. Ispitivanje se izvodi Shapiro-Wilkovim testom. Ovisno o rezultatima testiranja nulte hipoteze (normalna razdioba mjerenih podataka) lako je ocijeniti radi li se o homogenoj, propusnoj ili nepropusnoj, ili heterogenoj litostratigrafskoj jedinici, koja se uvijek može razlikovati od krovine i podine. Na temelju rješenja, te poznavanja zemljopisnog mjesta gdje su reprezentativni podatci uzeti, jedinicu je lako imenovati prema pravilima litostratigrafske nomenklature.
In low-voltage-fed applications, single-stage inverters with buck and boost capabilities represent an appealing alternative to conventional voltage source inverters that require an additional ...boosting stage and, hence, imply higher cost, complexity, and volume. Among the available single-stage topologies, the recently proposed split-source inverter (SSI) offers several advantages over its competitors (e.g., the ability to employ conventional pulse-width modulation (PWM) schemes, constant voltage across the bridge, etc.). This paper examines the impact that the inductor's magnetic saturation can have on the design and operation of an SSI. The theoretical considerations are first presented using the test data of an actual saturated inductor. Four PWM schemes - two biased and two unbiased - are included in the analysis. A laboratory setup has been constructed for evaluation of the considered impact. The obtained results demonstrate that the inductor current ripple may be significantly underestimated if magnetic saturation is neglected in the SSI design.
This paper illustrates how the HIL devices of the latest generation can be used to aid in the design, optimization and quality assurance of PE controllers. Such devices can have as low as 0.5μs fixed ...time step and a PWM sampling frequency that can be as low as 6ns which makes them ideal to support controller development processes from the early design stage all the way to type testing and release testing stage.
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