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. 2021 Nov 18;11(1):22487.
doi: 10.1038/s41598-021-01669-6.

A new seven level boost-type ANPC inverter topology for photovoltaic applications

Jagabar Sathik M #  1 , Dhafer J Almakhles #  2
Affiliations

A new seven level boost-type ANPC inverter topology for photovoltaic applications

Jagabar Sathik M et al. Sci Rep. .

Abstract

Developing of new photovoltaic inverter topologies is received more attention in the last few years. In particular, designing an active neutral-point-clamping inverter type structure is quite popular for PV applications. The output voltage is always half of the input voltage (vin), which further increases the voltage rating of dc-link capacitors in the conventional three-level ANPC. To rectify the above problem and increase the output voltage by reducing dc-link capacitors voltage rating, a new boost type seven-level ANPC inverter topology is proposed. The proposed topology consists of seven switches and one floating capacitor. The floating capacitor voltage is self-balanced, and the output voltage is 1.5 times higher than the input voltage. A detailed comparison for some power components, power loss and cost with other existing topologies are presented. Further, the proposed topology is validated in a prototype hardware setup for different load values.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Boost ANPC type inverter topologies (a) 5L-ANPC topology presented in Ref., 7L-ANPC topology presented in (b), and (c),.
Figure 2
Figure 2
Circuit diagram of proposed 7L ANPC inverter topology.
Figure 3
Figure 3
Modes of operation of proposed 7L ANPC inverter topology (a–d) positive half cycle and (e–h) negative half cycle.
Figure 4
Figure 4
Modulation Technique (a) PD-PWM and (b) corresponding 7L waveform.
Figure 5
Figure 5
Prototype hardware setup.
Figure 6
Figure 6
Experimental results of proposed 7L boost type ANPC Inverter, (a) output voltage and current, (b) sudden load changes from 100 Ω and 50 mH to 80 Ω and 100 mH, (c) no-load to 100 Ω and 50 mH, modulation index (Ma) variations (d) 0.33–066, (e) 0.66–0.8, (f) 0.8–1.0, (g) sudden input voltage changes from 50 to 100 V, Switch (S1 and S1′) voltage and current (h) without loop inductor and (i) with loop inductor.
Figure 7
Figure 7
Output power vs efficiency of proposed RSC-SB2 topology.
Figure 8
Figure 8
Proposed RSC-SB2 topology with (a) PV and simple grid control structure and (b) three-phase system extension.
See this image and copyright information in PMC

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