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【多选题】
发电机通过变压器与无穷大电网并列运行，稳定概念通常用功角特性解释，功与角的正确含义是：
A.
功指的是发电机发出的无功功率
B.
功指的是发电机发出的有功功率
C.
角指的是发电机次暂态电势与无穷大电网电压间的差
D.
角指的是发电机端电压与无穷大电网电压间的差
E.
角指的是发电机空载电势与无穷大电网电压间的差
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