基于储能系统的pf和虚拟电感联合补偿微电网电压暂降

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1、工程硕士学位论文AbstractInrecentyears，withtheintensificationofenergycrisisandtheenhancementofpeople’Senvironmentalawareness，microgridgraduallybecomesafocusforitsenergyefficiency,environmentfriendliness，andflexibility．Therandomnessandintermittenceofnewenergypowergenerationinmicrogridimpactonqua

2、lityofpowerseriously，andpowersystemhassetdownstrictcriteriaforgrid-connectedpowergenerationofmicrogrid．Then，itisapivotalissuetoimprovethepowerqualityofmicrogridinordertomakemicrogridworkmoreeffectively．Thisthesisanalyzesvoltagesagsinmicrogridandproposesanewcompensationmethod．Microgridi

3、sakindoflow-voltageactivenetwork．Low-voltagelineparametersofmicrogriddeterminethefactthattheamplitudeofvoltagecanbeaffectedbyactivepowerlargely,andmicrogridshouldbedifferentfromtraditionalpowersystemsintermsofanalyzingvoltagesags．Besides，microgridcannotonlyabsorbpowerfrompowersystem，bu

4、talsoinputpowertopowersystemthoughitconnectswiththeterminalofdistributionnetworklikeotherloads．Alltheseitemsdeterminetheparticularityofvoltagesagscompensationinmicrogrid．Tocompensatemicrogridvoltagesags，thisthesisproposesanewmethodbycombiningenergy-storage—basedactivepowerfilter(APF)an

5、dvirtualinductance．Energy。。storage··basedAPFhastwokindsofoperationmode：whenmicrogridoperatesnormally,itworksinharmonicreductionmodetosuppressharmonics，andwhenmicrogridsuffersfromvoltagesags，itworksinvoltagecompensationmodetocompensatevoltagesags．Asvoltagesagsinmicrogridarecausedbydiffe

6、rentfactors，theyshouldbecompensatedindifferentways：ifvoltagesagsarecausedbymicrogriditselfandthereisasmalldeclineinvoltage，energy-storage-basedAPFwillbeused，andifvoltagesagsarecausedbydistributionsystem，thenewmethodbycombingenergy-storage—basedAPFandvirtualinductancewillbeused．Thevalid

7、ityandeffectivenessofthenewmethodhasbeenverifiedbysimulationofpracticalalgorithmcases．Thenewmethodproposedinthisthesisoperatesveryflexiblyinsupplyingeffectivecompensationforvoltagesagscausedbydifferentfactors，andworkseffectivelyinlimitingfaultcurrentbetweenmicrogridanddistributionsys