李贺龙,王雪敏,赵进全,王卓,洪平,皮李刚.基于Fryze时域无功定义的无功电能的准确计量[J].电测与仪表,2017,54(1):. Li Helong,Wang Xuemin,Zhao Jinquan,Wang Zhuo,Hong Ping,Pi Ligang.Accurate measurement of reactive power based on Fryze’s reactive power theory in time-domain[J].Electrical Measurement & Instrumentation,2017,54(1):.
基于Fryze时域无功定义的无功电能的准确计量
Accurate measurement of reactive power based on Fryze’s reactive power theory in time-domain
In allusion to the lack of accuracy of reactive power measurement methods at present under the condition of non-sinusoidal and asymmetry, this paper puts forward a reactive power measurement theory which is applicable to three-phase three-line system under the condition of non-sinusoidal and asymmetry based on Fryze’s reactive power theory in time-domain. According to Fryze’s reactive power theory in time-domain, three-phase instantaneous current can be decomposed into active current component and reactive current component. Then the value and direction of reactive power of each harmonic can be achieved by FFT analysis on three-phase instantaneous voltage and reactive current component so as to realize the accurate measurement of reactive power of three-phase three-line system under the condition of non-sinusoidal and asymmetry. In this method, the reactive power are divided into positive reactive power and negative reactive power to avoid the offset of inductive reactive power and capacitive reactive power under different harmonic frequency generated by the same harmonic source which is finally verified by Matlab simulation and provides theory basis for accurate measurement of reactive power under the condition of non-sinusoidal and asymmetry.
