Gou S2 G s3 SI +G3G2+G3G2+G3 R R 或表示为: nI=a'si+a2us2 ta3us3 =unl++un3 支路电流为: G G R G.+G. R G.+g. g+g b, is+b,us +bus 十 十 3) L R3 G+G 3 G,+G2 3 R G+g 3 +i2+R 1i s1 R 2us2 R 3us3 i 2 i3 +– +– 1 2 3 1 2 3 3 3 2 3 2 2 1 G G i G G G u G G G u u S S S n + + + + + = 或表示为： ( ) ( ) ( ) 33 22 11 1 1 1 2 2 3 3 n n n n S s S u u u u a i a u a u = + + = + + 支路电流为： ( ) ( ) ( ) ( ) 32 22 1 1 1 2 2 3 3 2 2 3 1 2 3 3 3 2 2 3 2 2 2 1 2 2 1 b i b u b u i i i G G i G G G u u G G R G R u u i S S S S S S n S = + + = + + + + + − + + = − = ( ) ( ) ( ) ( ) ( ) 33 23 13 2 3 1 3 2 3 3 3 2 2 3 2 3 1 3 3 1 i i i G G i u G G R G u G G G R u u i S S S n S = + + + − + + + + = − =