ij - POWERLAB - Univerza v Mariboru
ij - POWERLAB - Univerza v Mariboru
ij - POWERLAB - Univerza v Mariboru
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Obratovanje elektroenergetskih omrež<strong>ij</strong> - stabilnost stran 276. VajaZa koliko se zviša meja statične stabilnosti prenosa električne energ<strong>ij</strong>e zdvosistemskim daljnovodom 110 kV, dolžine 200 km ob regulirani napetostigeneratorjev na vhodu in zelo velikem omrežju na izhodu, če ga priključimo na220 kV.u = 1.05u = 1.0S T = 2×40 MVAu k = 10.5 %x = 0.4 Ω/kmPrenosna moč je sorazmerna kvadratu napetosti.pel'uu∝ u= 22Ker zvišamo napetost za dvakrat, je prenosna moč štirikrat večja.Drugi način:a) S osn = 100 MVA in U osn = 110 kV b) S osn = 100 MVA in U osn = 220 kVZosn3( 110⋅10) 22Uosn= = = 121 Ω6S 100⋅10osnZosn3( 220⋅10) 22Uosn= = = 484 Ω6S 100⋅10osnxDVxl ⋅ 1= ⋅ =2 Zosn0.4⋅200 1= ⋅ = j0.33062 121xDVxl ⋅ 1 0.4⋅200 1= ⋅ = ⋅ = j0.08262 Z 2 484osnxTSosn100= uk⋅ = 0.105⋅ = j0.13125S 240 ⋅Tx= ⋅ S⋅ U= 100 1100.105 ⋅ ⋅ = j0.03282 2Tosn 110uk2ST U22022⋅40 220pmeu ⋅ eu ⋅= = =x x + xTDV1.05⋅1= = 2.27350.13125 + 0.3306pmeu ⋅ eu ⋅= = =x x + xTDV1.05⋅1= = 9.09880.0826 + 0.0328Pm = pm ⋅ Sosn= 2.2735⋅ 100 = 227.35 MW Pm = pm ⋅ Sosn= 9.0988⋅ 100 = 909.88 MWPrimerjava obeh prenosnih moči:ppm(220)m(110)= 4