Introduction Conclusions References Tables Figures â— â—® â— â—® Back Close Full Screen / Esc Papers published in Hydrology and Earth System Sciences Discussions are under open-access review for theâ€¦ (More)

This paper defines and measures the AC quantities of single-tone signals based on symmetry principles. After defining the frequency associated with a rotation phase angle in a sampling time interval,â€¦ (More)

The paper first achieves the real frequency with the power system voltage by using a novel frequency measuring method that is based symmetry principles. Then, it is proposed to obtain the powerâ€¦ (More)

The paper applies symmetry principles to measure AC power. After obtaining frequency-dependent rotation phase angle with symmetry groups of voltage, the paper calculates gauge active and reactiveâ€¦ (More)

This paper proposes a new method to measure AC frequency and amplitude by combining group theory and spiral vector theory. At first, the real frequency of power system is defined associated with aâ€¦ (More)

We proposed a new type PMU by combining spiral vector theory with group theory. First, a synchrophasor is defined as a rotation vector that had three elements that are AC frequency, the magnitude andâ€¦ (More)