Nyob rau hauv lub sijhawm niaj hnub no ntawm cov khoom sib xyaw loj ntawm cov khoom siv hluav taws xob tshiab zoo nkauj (xws li cov roj ntsha tsis sib xws Tsis tshua muaj hluav taws xob thev naus laus zis tsis muaj lub zog sib txuas thiab teb cov khoom siv tsis sib xws los ua kom muaj kev sib haum xeeb ntawm lub zog tshiab thiab cov kab sib chaws. Nws cov txheej txheem kev nyuaj siab ncaj qha cuam tshuam rau kev nyab xeeb ntawm kev faib ua feem sib kho dua tshiab lub zog.
1 Lub hom phiaj tseem ceeb ntawm Lvrt: los ntawm "kev tiv thaiv dhau mus" rau "kev txhawb nqa"
Qhov "OFF kev tiv thaiv" ntawm cov invererers ib txwm muaj kev sib tw tuag. Thaum lub zog hluav taws xob ntawm lub hwj chim sib tw poob qis dua 80% ntawm cov nqi sib txuas yuav ua rau muaj kev tiv thaiv lub zog ntev li ntawm 0.1 feeb, ua rau cov zis tshiab ploj tam sim ntawd. Xyoo 2019, ib qho cua ua liaj ua teb nyob rau hauv Europe tau tshwm sim rau kev sib sau ua ke ntawm cov kab sib chaws ntawm cov kab sib chaws
Lub cim tshiab Lvrt ua tau tiav ua tiav ntawm "Rise caij dhau ntawm" thiab "kev txhawb nqa voltom". Thaum muaj kev tawm tsam voltage yog kuaj (xws li poob rau 20% ntawm cov nqi uas muaj zog ntawm DC sab thiab tsis txhob muaj lub zog tshaj bipolar tancoler) overvoltes puas tsuaj; Nyob rau tib lub sijhawm, kho cov zis tam sim no thiab kev tawm tsam tam sim no (nrog cov kev sib tw sai ntawm li 1.5 zaug ntawm kev sib tw tam sim no) rau hauv daim phiaj voltage sai tau. Qhov ntsuas tiag tiag ntawm lub photovoltaic chaw nres tsheb fais fab hauv Suav teb qhia nrog Lvrage tuaj yeem ua haujlwm rau 0% (peb-theem tsis sib xws li hauv 0.5 vib nas this tom qab kev txhaum tau tshem tawm.
2 Cov Kev Tshawb Fawb Kev Tshawb Fawb: Los ntawm 'Ua Raws' rau 'Kev Ua Haujlwm Zoo'
Cov kev hloov kho vajtse txhim kho txhawb kev ua haujlwm hnyav. Lub zog module ntawm cov inverter admin-voltage resistant igbt (thaiv voltage 1700v), uas nce cov overvoltage margin los 40% piv rau cov tsoos 1200v li cas; DC sab yog nruab nrog Supercaporitor cov chaw cia khoom ntim chaw nyob hauv 200ms thiab tiv thaiv DC npav voltage los ntawm kev tswj hwm. Ib hom phiaj ntawm 100kw inverter ua tiav nrog kev ua haujlwm heev ntawm voltage poob los ntawm 100% thiab tom qab ntawd rov qab rov qab thaum lub sijhawm LVRT. Tus qauv ntsuas kub nyob ruaj khov tsis pub dhau 85℃yam tsis muaj kev puas tsuaj.
Software algorithms txhim kho kev teb ceev. Lub lvrt algorithm raws li kev twv ua qauv (MPC) nce qhov ntsuas zaus rau 10kHz, uas yog 5 zaug sai dua li kev tswj hwm pi ib txwm muaj. Nws tuaj yeem xaiv voltage dauv thiab kho cov khoom tawm tam sim no tsis pub dhau 5ms. Cov "Daim phiaj impedance sensing" thev naus laus zis tsim los ntawm cov tswv yim hluav taws xob raws li lub sijhawm 0.9) thiab kho cov kev hloov pauv hluav taws xob raws li 0.9), txo cov phiaj xwm rov qab los ntawm 30%.
3 cov qauv thiab cov xwm txheej: cov kev ua si thev naus laus zis ntawm kev ua haujlwm zoo thoob ntiaj teb
Qhov sib txawv ntawm LVRT cov qauv nyob rau txawv teb cov khoom lag luam tau. Suav GB / T 19964 yuav tsum muaj cov photovoltaic inverters kom nyob twj ywm txuas rau hauv daim phiaj rau 2 vib nas this thaum lub voltage poob mus 20%; EU EN 50530 STIPULATES tias thaum lub zog hluav taws xob mus rau 0%, nws yuav tsum tau txais kev txhawb nqa rau 150ms; Peb lub Tebchaws Asmeskas ulv 1741 hais txog cov neeg siv hluav taws xob nquag ua haujlwm qis dua li 90% tsis pub dhau 2 feeb tom qab kev txhaum tshem tawm). Txhawm rau kom tau raws li kev ua lag luam thoob ntiaj teb, ib qho kev lag luam hauv "programmable lvrt nkhaus", uas tso cai rau cov neeg siv kom hloov 20 tus qauv sib txawv ntawm software. Cov khoom tau ua tiav qhov thaiv kev siv dawb hauv ntau dua 100 lub teb chaws thoob ntiaj teb.
Cov ntaub ntawv lees paub ntawm cov phiaj xwm fais fab teeb meem. Hauv cov hwj huam tsis muaj zog (xws li cov chaw sib luag<5%); In a multi inverter cluster scenario, it is necessary to avoid current oscillations during the LVRT process. A wind farm used "cluster coordinated control" to control the current deviation of 50 inverters within 5%, avoiding secondary faults. These practices demonstrate that LVRT technology has evolved from simply meeting standards to a system level solution that adapts to complex power grid environments.
Raws li cov feem ntawm lub zog tshiab tshaj 40%, LVRT thev naus laus zis yuav hloov los ntawm "kev teeb tsa kev teeb tsa" rau "yuav tsum tau ua" yuav tsum tau ua ". Lub Luvrt muaj peev xwm ntawm cov inveration tom ntej yuav txuas ntxiv mus rau "HALTT)" thiab "Ze Ze Caij Tsheb teb rau kev sib tw Anomalies. Qhov kev hloov pauv no los ntawm "Passive Adaptation" rau "Kev txhawb nqa" ua rau lub zog sib hloov pauv, muab kev txhawb nqa kev ruaj khov rau kev tsim lub zog tshiab.