Synchronous reference frame method for reactive and harmonics currents detection based on sequence component extraction
Longhua Mu · Journal of Central South University(Science and Technology) · 2011
In order to study the detection method and calculation of reactive power,unbalance and harmonic current,an improved synchronous reference frame method based on sequence component extraction in the time domain was presented.The results show that for the use of general dq0 theory without PLL,the method can accurately extract positive,negative and zero sequence components of both fundamental and integer harmonics,detect fundamental positive sequence active currents and reactive currents,as well as distinguish the fundamental positive sequence reactive current from the sum of unbalanced components and harmonic currents based on different compensating purposes.The proposed method is suitable for the three-phase three-wire or four-wire or unbalanced power system and is verified by theoretical analysis and simulation.