Active neutral point clamped converter for equal loss distribution

Abstract

Active neutral point is the most attractive inverter topology in many applications such as a photovoltaic system because of the equal loss distribution among switches. This study presents a new single-phase five-level active neutral-point clamped converter topology. It can be applied to achieve optimal total harmonic distortion. In addition, this topology helps to obtain voltage balancing among the capacitors. An analysis of the switching state and commutation of the converter are also presented here in order to balance the power losses among the semiconductor devices. The simulation has been carried out in MATLAB SIMULINK to investigate the effectiveness of the proposed topology. Experimental results are presented to validate the proposed topology. Moreover, a comparative study has been made to show the cost-effectiveness of the proposed topology.

New MPC‐5LUC with reduced PSD count for MVHP direct‐drive WECS with PMSG: a cost‐effective solution

“…The validation of proposed topology under various supply conditions is verified with Simulation and down scaled experimental setup. Experimental waveforms at ac and dc sides of [13][14][15][16] topologies under various tested conditions (Scale: v abc : 50 V/div, i abc : 10 A/div, V o : 100 V/div,…”

“…Moreover, the experimental validation of other reduced device count topologies [13][14][15][16] is carried out and corresponding results are shown in Fig. 9.…”

Voltage Jump Suppression and Capacitor Voltage Fluctuation Analysis for a Four-Level Hybrid Flying Capacitor T-Type Converter

“…Apart from the above three multilevel topologies, a variety of other multilevel converters have been proposed [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. For instance, a 3L T-type converter was proposed which is suitable for low-voltage applications [6][7][8][9].…”

“…The T-type converter can have the same output voltage quality as the NPC converter, without the need for clamping diodes, but the two main switches need to block the full dc-link voltage. The active neutral-point clamped (ANPC) converter was proposed to solve an unbalanced loss distributions issue as in the NPC topologies [10][11][12][13][14][15][16]. The 3L ANPC has improved the 3L NPC by replacing the clamping diodes with clamping switches.…”

“…However, the 3L ANPC converter need more switching devices than the 3L NPC. A 5L ANPC converter is a combination of a 3L ANPC converter and a 3L FC converter [14][15][16]. Its dc-link needs two capacitors and each leg has a flying capacitor and a total of 12 switching devices for a three-phase system.…”