The electrified railway is a fluctuating high- power single- phase commutation load, which may threat power sys-tem security operation.
电力机车为波动性很大的大功率单相整流负荷，可能威胁电力系统的安全运行。
With gradually increasing proportion of distributed generation (DG) in power sys tem, traditional power system planning faces substantial challenges and new request.
随着分布式发电（DG）在电力系统中所占比重越来越大，对传统的电力系统规划提出了新的挑战和要求。
With gradually increasing proportion of distributed generation (DG) in power sys tem, traditional power system planning faces substantial challenges and new request.
随着分布式发电（DG）在电力系统中所占比重越来越大，对传统的电力系统规划提出了新的挑战和要求。
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