Based on Floquet theory, a simple and fast time-domain stability analysis method for an N-parallel inverters system is proposed. Furthermore, general model of the in grid-connected mode island are derived, corresponding criteria derived based theory. Subsequently, simulations experiments two-parallel modes conducted to verify correctness effectiveness proposed method. To end, complexity compari...

in this paper, two new cascaded inverters are proposed, by using the series connection of new submultilevel inverters. each of the proposed submultilevel inverters consists of three batteries and eight power switches. four algorithms are presented to determine the voltages of these batteries for each of the proposed structures. in this study the comparison between the proposed structures with c...

Multilevel inverter technology has emerged recently as a very important alternative in the area of high-power mediumvoltage energy control. Using multilevel inverters application in fuel cell, solar cell & wind turbines is increasing now a day‘s rapidly. Therefore, Harmonic reduction techniques in multilevel inverters are considered very important task Over the past decades, depending upon the ...

Abstract – In this paper, a generalized power loss algorithm for multilevel neutral-point clamped (NPC) PWM inverters is presented, which is applicable to any level number of multilevel inverters. In the case of three-level inverters, the conduction loss depends on the MI (modulation index) and the PF (power factor), and the switching loss depends on a switching frequency, turn-on and turn-off ...

Abstract The ‘mismatch losses’ problem is commonly encountered in distributed photovoltaic (PV) power generation systems. It can directly reduce generation. Hence, PV array reconfiguration techniques have become highly popular to minimize the mismatch losses. In this paper, a dynamical method for Total-Cross-Ties (TCT) and Series–Parallel (SP) interconnected arrays proposed. aims improve maximu...

Modern electric distribution systems typically contain several feedback-controlled parallel inverters that together form a complex power system. Consequently, number of issues related to stability arise due interactions among multiple inverter subsystems. Recent studies have presented methods where the and other dynamic characteristics paralleled system can be effectively analyzed using impedan...

In this paper, experimental measurements of four parallel-connected three-phase inverters railway auxiliary converters were carried out. The purpose measurement was to verify the ability parallel co-operation three- phase connected a common bus, verifying starting sequence and power sharing by individual converters. powered high voltage AC source outputs intercon- nected form network. uniform t...

Virtual impedances are often used in droop-controlled paralleled-voltage-sourced inverters (VSIs) to achieve proper power sharing. However, different and unknown output of VSIs will affect the decoupling sharing performances. To solve this problem, article proposes a novel controller for by using disturbance observer (DOB). The DOB is adopted observe currents without any extra current sensors. ...