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【单选题】
三相桥式变流电路工作于有源逆变状态，输出电压平均值Ud的表是（ ）。A Ud=- 2.34U2cosβ B Ud=1.17U2cosβC Ud= 2.34U2cosβ D Ud=-0.9U2cosβA.
Ud=- 2.34U2cos β
B.
Ud=1.17U2cos β
C.
Ud= 2.34U2cos β
D.
Ud=-0.9U2cos β
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