(6 分) 复合序网图见答图 5.解:(1 )计算空载电势 2 d2 dq)()(U PX U QX UE ????? 22)14 .21()14 .2203 .01(?????(2 )计算发电机功率极限 20 .114 .2 158 .2 d q max E??????X UEP (3 )计算系统静态稳定储备系数为 100 % max EP????P PPK%20 100 1 12.1???? 6. 解: 1 )计算系统综合电抗 T2 L T1 'd 'd2 1XXXXX?????15 .1142 .02 7.0197 .0461 .0?????(3 分) (2 )计算暂态电势'E????79 .31 85 .0 cos 1?(1 分) 36 .079 . 583tg31 .0 tg?????PQ (2 分) 2 'd2 'd')()(U PX U QX UE ????? 22)15 .1583 .0()15 .036 .01(?????565 .1?(5 分) (3 )计算功率极限 36 .115 .1 1565 .1 'd ' max E??????X UEP (4 分) (4 )计算静态稳定储备系数为 100 % max Ep????P PPK%2.133 100 0.583 583 .036 .1???? 7.解:(1 )计算系统总电抗 T2 T1 dd2 1XXXXX l?????267 .1092 .063 .02 10935 .0766 .0??????(3 分) (2 )计算发电机的空载电势 qE 设???0UU ?,则其标么值为: 1209 1121 220 115 ????U1230 130 ??P????8.1 99 .0 cos 1?142 .01. tg8 1 tg??????PQ 则2 d2 dq)()(U PX U QX UE ???????
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