TY - JOUR ID - 1315 TI - Stable Operation and Current Sharing Control among Parallel Single-Phase ‎Inverter Modules with Unequal Filter Impedances JO - Journal of Operation and Automation in Power Engineering JA - JOAPE LA - en SN - 2322-4576 AU - Sarvghadi, P. AU - Monfared, M. AD - Department of Electrical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran Y1 - 2022 PY - 2022 VL - 10 IS - 2 SP - 134 EP - 142 KW - Parallel inverter modules KW - Circulating current KW - Load Sharing DO - 10.22098/joape.2022.9668.1673 N2 - Parallel connection of two or even more single-phase inverter modules is a successful solution to increase the reliability and the efficiency of an inverter at moderate power levels. Stable operation and proper current sharing among parallel inverter modules is a key issue, especially when they are connected to a common load through unequal output filter impedances. In this paper, a new formulation and consequently a proper current sharing control algorithm for parallel connected inverter modules with the possibility of unequal filter impedances is proposed. Also a dual-loop voltage control with the filter current as the inner loop feedback signal, considering the effect of digital control delay, is adopted. The controller parameters are designed according to a frequency domain analysis. Finally, theoretical achievements are confirmed by experimental test results on a test rig with two 250 W parallel connected single phase inverters. UR - https://joape.uma.ac.ir/article_1315.html L1 - https://joape.uma.ac.ir/article_1315_9b756212ca02b880ffaef0266ede276f.pdf ER -