System harmonic impedance estimation method of new energy access point
This paper proposes an improved harmonic impedance estimation method for access point systems based on fast independent component analysis(FastICA),which is a key step in the study of harmonic responsibility division and harmonic amplification in new power systems.By using FastICA for the rapidly changing components of the common connection point,mixing matrices and independent com-ponents are obtained,then the linear relationship between the elements of the mixing matrix and the har-monic impedance is derived.Based on the relationship and characteristics of the harmonic current and impedance on the system side and power supply side,then according to the correlation between independ-ent components and mixed signals,a transformation matrix is obtained and the correct order of independ-ent components and the relative mixed matrix are obtained.Finally the calculation formula of harmonic impedance of the system is deduced through the relationship between the elements of the mixed matrix.A simulation model was built to verify the proposed method.The simulation results show that the improved harmonic impedance estimation method can accurately estimate the harmonic impedance of the system.When the amplitude of the system harmonic current is smaller than that of the power supply harmonic cur-rent and the gap is large,the proposed method gain higher estimation accuracy and stability.
new power systemssystem harmonic impedanceFastICAharmonic responsibilityharmonic amplification
万方数据
维普
