在电力市场环境下，电网可用输电能力(atc)是反映输电系统可用于传输电力的剩余容量的重要指标。
In the circumstances of electricity market, available transfer capability (ATC) indicates the amount of the further usable transmission surplus capability of transmission system.
蓄电池作为直流系统交流停电时的后备电源，其剩余容量直接影响了直流系统的安全运行。
As backup power supply of the DC system, the residual capacity of battery effected safe operation of DC system directly when ac power failure occurs.
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