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【多选题】
关于电力系统频率的调整，下述说法中正确的是( )。
A.
电力系统频率调整的基本原理是根据电力系统有功负荷的变化，改变发电机的有功出力，维持电力系统在所要求频率下的有功功率平衡
B.
电力系统频率的一次调整是针对第一类负荷变化进行的，它通过发电机组的调速器来实现，但一次调整不能实现频率的无差调节
C.
电力系统频率的二次调整结束后，不管频率是否回到负荷变化前的数值，负荷的变化量均为调频机组所承担
D.
在无差调节方式下，二次调整结束后，负荷的变化全部为调频机组所承担
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