2,904 research outputs found
Providence College Faculty Author Series 2012-2013: Dr. Adrian Weimer
No full textDr. Adrian Weimer (History, Providence College) discusses her new book Martyrs\u27 Mirror: Persecution and Holiness in Early New England and the cultural importance of martyrdom within Colonial America
Providence College Faculty Author Series 2012-2013: Dr. Adrian Weimer
No full textDr. Adrian Weimer (History, Providence College) discusses her new book Martyrs\u27 Mirror: Persecution and Holiness in Early New England and the cultural importance of martyrdom within Colonial America
Adrian Matejka, 34th Annual ODU Literary Festival
No full textAdrian Matejka is the author of The Devil’s Garden and Mixology, which was a winner of the 2008 National Poetry Series. He is the recipient of two Illinois Arts Council Literary Awards and fellowships from Cave Canem and the Lannan Foundation. His work has been featured in American Poetry Review, The Best American Poetry 2010, and Ploughshares, among other journals and anthologies. He teaches at Southern Illinois University Edwardsville
Linear and Nonlinear Control of Distributed Power Generation Systems
No full textIn this paper, different control structures applied to distributed power generation system are discussed. Implementation of proportional-integral (PI), proportional-resonant (PR), hysteresis and dead beat controller in different reference frames is also treated. An evaluation in terms of current harmonic distortion when running in steady state condition is made. Additionally, the controllers' behavior in transient operation such as step in current reference and single phase fault in the utility grid has also been studied. Experimental results are presented for their evaluatio
PLL Algorithm for Power Generation Systems Robust to Grid Voltage Faults
No full textIn the case of unbalanced grid faults, one of the main problems for the Distributed Power Generation Systems (DPGSs) controller is the second harmonic ripple in the control, consequence of the phase unbalance caused by the fault. The second harmonic propagates into different sections of the controller and can have a negative influence on the controller even leading to trip out of the system. This paper proposes a novel Phase-Looked Loop (PLL) algorithm which is able to filter out the negative sequence and to provide a clean synchronization signal. Along with the conventional PI controller in the PLL structure, the proposed algorithm employs a repetitive controller to deal with the second harmonic. The purpose of the repetitive controller is to amplify the second harmonic in the reference of the PI controller, so that this can be better rejected. Simulation and experimental results are used to validate the robustness of the proposed system when running on grid faults
Performing the archive: following in the footsteps
No full textUsing documentation of Mike Pearson's performance 'Bubbling Tom', Deirdre Heddon attempts to step into his shoes and re-perform it
ENS Implementation - Part of the PSO Eltra contract 4524/2003
No full textwith PowerLynx A/S for the development of the ENS function for the PowerLynx PV inverters. The work started 01.01.03 and ended 29.02.04 and involved Frede Blaabjerg, Remus Teodorescu, Lucian Asiminoaei and Adrian Timbus from Aalborg University and Uffe Borup from PowerLynx A/S. The objective was to make the PowerLynx PV inverters compatible with the germans ENS standard which mainly consist in the requirement to disconnect from the grid in max. 2 seconds if the grid impedance is changed with 0.5 ohms resistive. During 01.07 ? 31.08 2003, an algorithm based on the injection of a voltage of 75 Hz and the on-line measurement the 75 Hz component from the grid current and voltage using simplified DFT was developed by Uffe Borup, Remus Teodorescu and Lucian Asiminoaei. The algorithm is described in detail in the report ?ENS design? enclosed in Appendix A and in the two published paper (final paper for APEC ?04 and approved digest for PESC ?04). Then the algorithm was finally implemented and the experimental test carried out proved to be satisfactory as shown in chapter 2 ?ENS implementation?. Very few missed tests were recorded on very high inductive grid (0.6 + 1.1i) when the reactance is higher than the resistance. In the period 03.02.04 ? 13.02.04 some attempts was done in order to improve the detection by compensating the delay in the voltage measurement but no improvement was noticed. Thus, these last minute changes was not included in the final version of the software. Finally, the detection mechanism of another PV running in parallel that injects t5Hz for ENS grid measurements has been done. The code for parallel ENS is also enclosed
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