以电力系统状态完全可观测和相量测量装置（PMU）配置数目最小为目标，提出了一种改进的PMU最优配置方法。
Taking the full network observability of power system operation state and least number of phasor measurement units (PMU) as objective function, an improved optimal PMU placement algorithm is proposed.
在物理学中的对称性，事实上意味着某种基本量不可观测。
Actually the symmetry in physics means unmeasurable for certain fundamental quantities.
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