Investigation of a Transistor Clamped T-Type Multilevel H-Bridge Inverter With Inverted Double Reference Single Carrier PWM Technique for Renewable Energy Applications

Abstract

The Multilevel inverters (MLIs) are a new breed of power electronics converters. They are primarily used for the conversion of dc power to ac power. The two-level inverters are conventionally used to obtain ac power, but it requires operating the switches under very high switching frequency. Besides, the two-level inverter necessitates the use of LC filters with the switches operating under high dv/dt stress. The MLIs offer the advantage of utilizing several dc voltage sources to generate a stepped ac waveform with the proper arrangement of switches. Investigation of a Transistor Clamped T Type H-Bridge Multilevel Inverter (TC-TT-HB-MLI) with Inverted Double Reference Single Carrier PWM Technique (IDRSCPWM) for Renewable Energy Applications are discussed in this paper. A PV source is taken as an input to the TC-TT-HB-MLI. For different modulation indices like 0.85, 1 and 1.25, the FFT analysis is performed and presented, which corresponds to the variations in the irradiations from solar energy. A single unit of the TC-TT-HB-MLI is extended to a generalized MLI structure named Generalized Transistor Clamped T-Type H-Bridge Multilevel Inverter (GTC-TT-HB-MLI). The significant benefits of GTC-TT-HB-MLI are the multiple numbers of reductions in the switch count, and driver circuit counts for a higher number of MLI levels. Fast Fourier Transform (FFT) analysis is carried out on the MLI output to calculate the total harmonics distortion (THD). The experimental verification is performed using SPARTAN 3E-XCS250E; the gate signals are generated and provided to the switches.

Scalar Control of Single-Phase Induction Motor Using PV Fed Modified Seven Level H-Bridge Inverter with Improved Sinusoidal PWM Technique

“…It thus reduces the voltage level to 1⁄2 with those of the inputs, resulting in a higher duty cycle but higher losses (Bhaskar et al 2020). Varieties of studies have been conducted to reduce the elements of MLI, and numerous designs have been recommended depending on the various layers that face obstacles (Dhanamjayulu et al 2020), (Mukundan et al 2020).…”

Comparison between selective harmonic elimination and nearest level control for transistor clamped H-bridge inverter

“…Switching frequency for multilevel inverters is considered high if it is above 1 kHz. High switching frequency modulations like multicarrier/ multireference PWM [9]- [12], space vector modulation (SVM) [13], [14] are superior in terms of harmonic minimization; however, they suffer from high switching losses. To overcome this issue, low switching frequency modulations are used.…”

A new tri-source symmetric cascaded multilevel inverter topology with reduced power components

“…MLIs use isolated dc sources and small capacitors to synthesize output voltage in small steps through the cascading connection of H-Bridge (HB), half leg structure with clamping diodes and flying capacitors (Rodriguez et al , 2002). Several remarkable achievements have been registered in developing topological structures (Trabelsi et al , 2021; Mhiesan et al , 2020; Bhaskar, 2020) and modulation strategies (Gnanasambandam et al , 2017; Meraj et al , 2019; Shukla et al , 2007). A new MLI topology is based on multilevel dc-link and an HB inverter to reduce the switching devices, dc sources and clamping capacitors/diodes to offer more voltage levels.…”