Title :
A novel stability criterion of AC power system with constant power load
Author :
Liu, Zeng ; Liu, Jinjun ; Bao, Weihan ; Zhao, Yalin ; Liu, Fangcheng
Author_Institution :
State Key Lab. of Electr. Insulation & Power Equip., Xi´´an Jiaotong Univ., Xi´´an, China
Abstract :
Power electronic converters in AC power system, such as the boost rectifier, behave as constant power loads (CPLs), which have negative impedance characteristics at the input terminals. And this might cause system instability. In small-signal sense, the stability of the system including the CPL is determined by the source output impedance and the load input impedance (admittance). As a result, the stability criterion based on these impedances is an effective way to check the stability of system. This paper summarizes existing work and introduces our contribution on the stability criterions for AC power system. A novel stability criterion using the infinite-norm of the impedance (admittance) matrixes is proposed. Further, the conservatism of the proposed criterion was compared with the one of the existing criterions.
Keywords :
electric impedance; load (electric); power convertors; power electronics; power system stability; AC power system; CPL; ac power system; admittance matrixes; constant power load; load input impedance; negative impedance; power electronic converters; small-signal sense; source output impedance; stability criterion; system instability; Eigenvalues and eigenfunctions; Impedance; Inductance; Power system stability; Rectifiers; Stability criteria;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2012 Twenty-Seventh Annual IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4577-1215-9
Electronic_ISBN :
978-1-4577-1214-2
DOI :
10.1109/APEC.2012.6166089
