Optimised inverter by switch sharing: a control solution for photovoltaic applications

Abstract

Switch-sharing-based multilevel inverter can be useful to develop an improved-performance DC-AC converter for low-power photovoltaic applications. However, this cannot be fully achieved without having a reliable control solution. Hence, this study presents a smart control strategy equipped with an adaptive proportional-integral controller. The adaptive characteristic is established through a tuning module that continuously fine tunes only one parameter. With the tuning mechanism, the load current quality is able to be continuously retained at the acceptable level even during the presence of disturbances. To validate the control performance, experimental work has been conducted on a laboratory prototype under loaddisturbance conditions.

Capacitor Voltage Balancing with Online Controller Performance-Based Tuning for a Switch-Sharing-Based Multilevel Inverter

“…The switch-sharing-based multilevel inverter is modified from the full-bridge configuration with a switch-sharing capability. The inverter offers advantages for low power solar PV applications including lower harmonic contents and enhanced output quality [15]. However, it has a shortcoming that is quite similar to that of the DCMI.…”

Single phase nine level inverter using single DC source supported by capacitor voltage balancing algorithm

“…However, the MLIs are also used in low‐ and medium‐power applications, especially in transferring power efficiently from renewable energy (RE) sources (like fuel cells, photovoltaic systems etc.) to the load [3, 4]. An MLI is generally a connecting configuration of several input DC levels (acquired either from many isolated DC sources or splitting a single DC source into many voltage levels by using capacitors) and power electronic switches to produce a staircase voltage waveform.…”