BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Europe/Ljubljana BEGIN:DAYLIGHT DTSTART:20200329T030000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3 TZNAME:CEST END:DAYLIGHT BEGIN:STANDARD DTSTART:20191027T020000 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZNAME:CET END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20191129T121857Z UID:18C5D958-8A1B-46D4-8388-F1237A9DC268 DTSTART;TZID=Europe/Ljubljana:20191128T110000 DTEND;TZID=Europe/Ljubljana:20191128T120000 DESCRIPTION:Abstract\n\nNowadays\, voltage source inverters (VSIs) are the most popular switching converters due to their capability to interface dc and ac power systems. Applications are ranging from few kilowatts up to se veral megawatts\, with many possible configurations regarding the phase nu mber (i.e\, single-phase\, three-phase\, and multiphase) and the number of output voltage levels (two-level and many multilevel topologies). Specifi cally\, a VSI can be found in all the grid-connected energy-concerning sys tems\, since the energy storage and most of the renewable generation syste ms are based on dc technologies (batteries\, supercapacitors\, fuel cells\ , photovoltaics\, etc). Even in case of ac generation systems\, an interme diate dc-link to connect the ac grid is usually adopted (i.e. back-to-back configurations for wind and hydroelectric generation\, flywheels\, etc). A VSI can be also found in all the motor-drive applications\, for the know n advantages of ac motors over dc motors\, with an increasing interest tow ards multiphase machines for the sake of the drive reliability and the pos t-fault operation capabilities.\n\nAs all the switching converters\, VSIs suffer the concern of voltage and current harmonics\, both at the dc (inpu t) and the ac (output) sides. The mitigation of the switching harmonics is performed by ac-link series inductors\, leading to a residual ac current ripple\, and dc-link parallel capacitors\, leading to a residual dc voltag e ripple. The design of these reactive components is a key aspect for the performance of the whole dc/ac conversion system\, and the analytical dete rmination/prediction of current and voltage input/output ripples becomes a crucial element.\n\nThis lecture summarize one of the possible approaches for voltage and current ripples estimation\, basing on instantaneous peak -to-peak ripple analysis applied to the output ac current(s) and the input dc voltage\, considering the main inverter topologies. Basing on the peak -to-peak ripple profiles over the fundamental period\, the maximum\, the a verage\, and the RMS of the switching ripple amplitudes can be easily carr ied out. In this way\, the design of reactive components can be finalized and ripple minimization strategies can be defined. The analytical developm ents are supported by simulation results and experimental tests carried ou t on laboratory prototypes\, considering the different inverter configurat ions.\n\nCo-sponsored by: UL FE\n\nSpeaker(s): Gabriele Grandi\, \n\nRoom: P11\, Faculty of electrical engineering\, Trzaska 25\, Ljubljana\, Sloven ia\, Slovenia\, 1000 LOCATION:Room: P11\, Faculty of electrical engineering\, Trzaska 25\, Ljubl jana\, Slovenia\, Slovenia\, 1000 ORGANIZER:vanjaa@fe.uni-lj.si SEQUENCE:4 SUMMARY:Invited lecture: Input dc voltage and output ac current ripples in voltage source inverters URL;VALUE=URI:https://events.vtools.ieee.org/m/210835 X-ALT-DESC:Description: <br /><p><strong><u>Abstract</u></strong></p>\n<p>N owadays\, voltage source inverters (VSIs) are the most popular switching c onverters due to their capability to interface dc and ac power systems. Ap plications are ranging from few kilowatts up to several megawatts\, with m any possible configurations regarding the phase number (i.e\, single-phase \, three-phase\, and multiphase) and the number of output voltage levels ( two-level and many multilevel topologies). Specifically\, a VSI can be fou nd in all the grid-connected energy-concerning systems\, since the energy storage and most of the renewable generation systems are based on dc techn ologies (batteries\, supercapacitors\, fuel cells\, photovoltaics\, etc). Even in case of ac generation systems\, an intermediate dc-link to connect the ac grid is usually adopted (i.e. back-to-back configurations for wind and hydroelectric generation\, flywheels\, etc). A VSI can be also found in all the motor-drive applications\, for the known advantages of ac motor s over dc motors\, with an increasing interest towards multiphase machines for the sake of the drive reliability and the post-fault operation capabi lities.</p>\n<p>As all the switching converters\, VSIs suffer the concern of voltage and current harmonics\, both at the dc (input) and the ac (outp ut) sides. The mitigation of the switching harmonics is performed by ac-li nk series inductors\, leading to a residual ac current ripple\, and dc-lin k parallel capacitors\, leading to a residual dc voltage ripple. The desig n of these reactive components is a key aspect for the performance of the whole dc/ac conversion system\, and the analytical determination/predictio n of current and voltage input/output ripples becomes a crucial element.</ p>\n<p>This lecture summarize one of the possible approaches for voltage a nd current ripples estimation\, basing on instantaneous peak-to-peak rippl e analysis applied to the output ac current(s) and the input dc voltage\, considering the main inverter topologies. Basing on the peak-to-peak rippl e profiles over the fundamental period\, the maximum\, the average\, and t he RMS of the switching ripple amplitudes can be easily carried out. In th is way\, the design of reactive components can be finalized and ripple min imization strategies can be defined. The analytical developments are suppo rted by simulation results and experimental tests carried out on laborator y prototypes\, considering the different inverter configurations.</p> END:VEVENT END:VCALENDAR