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Energies 2017,10, 616
andflexible,whichmightreduce theswitchingfrequenciesof inverterdevices. Thetotal switching
frequencyofdevices increasedafter shifting fromthe lowswitching frequencymethodto thehigh
powerdifferencemethodat0.4s; the total switchingfrequency increasedevenmoreafterswitching
themajorpowersource frompowersource1 topowersource2,a lowervoltagepowersource,at0.5s,
which indicatedthatsettingahighervoltagepowersourceas themajorpowersourcecouldreducethe
switchingfrequenciesofdevices. Inaddition, the total switchingfrequencyofdevices insteadystate
was lower thanthat in transientstateanditwashigherwhenthemotorspeedwasdecreasingthan
whenmotorspeedwas increasing.Under theproposedcontrolmethod, total switchingfrequency is
far lowerthaninthecontrastingmodel,especially intheperiodofstarandtrianglemode. InFigure9b,
the switching lossof inverterswasproportional to the total switching frequencyofdevicesand in
mostcircumstances theshareofswitching lossesof inverterswasunder30%,whichwas ideal.
Inputpowercurvesofboth invertersareshowninFigure10.
Itwasevident thatbefore0.5s,powersource1wasthemajorpowersource; in thisperiod, star
modeand trianglemodewereall poweredbypower source 1andall inputpowerwasgenerated
byinverter1;after0.5s,powersource2wasthemajorpowersource. In thisperiod, starmodeand
trianglemodeweresuppliedbypowersource2andall inputpowerwasgeneratedbyinverter2.When
in independentmode, bothpower sourcesprovidedpower. After shifting fromthe lowswitching
frequencymethodto thehighpowerdifferencemethodat0.4 s, thepowerdifferencebetweentwo
inverters increased;afterswitchingthemajorpowersource frompowersource1 topowersource2
at0.5s, inverter2’spowerwashigher thaninverter1’s,becomingthemajorpoweroutput inverter;
nevertheless,becauseof thevoltageofpowersource2being lower thanthatofpowersource1,after
switching themajorpower source topower source 2, thepowerdifferencebetween two inverters
decreased,which indicated that thepowerdifference of the inverterswas affectedby thevoltage
differenceof thepowersources.
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
time (s)
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5 10 4
input power of inverter 1
input power of inverter 2
total input power
Figure10.Curvesof inputpowerofboth inverters.
AnefficiencyMAPof thedrivesystemwithswitchedwindingmodesandmulti-level current
hysteresis modulation is shown in Figure 11a; that of the contrasting drive system is shown in
Figure11b.
258
Emerging Technologies for Electric and Hybrid Vehicles
- Titel
- Emerging Technologies for Electric and Hybrid Vehicles
- Herausgeber
- MDPI
- Ort
- Basel
- Datum
- 2017
- Sprache
- englisch
- Lizenz
- CC BY-NC-ND 4.0
- ISBN
- 978-3-03897-191-7
- Abmessungen
- 17.0 x 24.4 cm
- Seiten
- 376
- Schlagwörter
- electric vehicle, plug-in hybrid electric vehicle (PHEV), energy sources, energy management strategy, energy-storage system, charging technologies, control algorithms, battery, operating scenario, wireless power transfer (WPT)
- Kategorie
- Technik