Implementation of a Single Phase Switched-Capacitor Nine-Level Inverter for PV System Applications with Selective Harmonic Elimination

Abstract

The main objective of this paper is to present a test a single phase switched capacitor nine-level inverter for PV system applications, with a simple harmonic elimination method. The main elements of the used multilevel inverter are a high power switched capacitor DC-DC converter and a high power DC-AC converter. The studied system with the proposed control method was tested on MATLAB/SIMULINK with solar panels. Also, an experimental test bench was prepared and used to validate the simulation results. The all obtained results prove the high efficiency of the studied PV system with the implemented control method.

A New Multicarrier Sinusoidal Pulse Width Modulation (SPWM) Strategy based on Rooted Tree Optimization (RTO) Algorithm for Reducing Total Harmonic Distortion (THD) of Switched-Capacitor Nine-level Inverter in Grid-connected PV systems

“…Figure 2 indicates the structure of the suggested 9LSCI, which is accomplished by cascading two circuits, an SCC and an inverter of two levels full-bridge (Nouaiti et al, 2017;Tariq et al, 2018). This must first be converted to a high DC voltage before being converted to AC Current.…”

“…Besides, to validate the performance of a single-phase nine-level switched-capacitor converter in a PV system, simulations and experimental tests are achieved with a simple harmonic elimination technique (Nouaiti et al, 2017). The same authors realize a stand-alone PV system application using a single-phase fivelevel switched-capacitor inverter (Nouaiti et al, 2018).…”

Realization of a Single-Phase Multilevel Inverter for Grid-Connected Photovoltaic System

“…A simplified model of a solar cell can be used, as shown in Figure 2. It's based on a current source, single diode, parallel resistance, and a series resistance [4]. The expression of the generated DC current from this model is described in (1).…”

“…Multilevel inverters appear as a good solution to overcome these problems, by developing optimal AC voltages composed at least with three levels, presenting low electromagnetic interferences, reducing the total harmonic distortion (THD) of the AC currents by using several modulation techniques and small filters, and causing low switching losses across the power switches [2,3]. Thus, PV multilevel inverters are chosen based on the desired power rating, number of the used power switch, and manufacturing cost [2,4]. Several control algorithms can be implemented with these inverters for the grid-connection based on different controllers.…”

Experimental Implementation of a Low-Cost Single Phase Five-Level Inverter for Autonomous PV System Applications Without Batteries

“…The proposed DC-AC FLC circuit is composed of an SCC tied with an HBC. The SCC is used to deliver an output voltage (VDC-Bus) two times greater than the input voltage VB (from the BC) by controlling the power switches Sb and Sc with complementary pulses [5,7], while the HBC is used to convert the generated DC-Bus voltage to an AC voltage.…”