Cascaded multilevel inverter based on symmetric–asymmetric DC sources with reduced number of components

Summary Multilevel inverters have been the vital component for the power electronic systems and have been researched extensively to further enhance their performances in terms of topology and their control. In this paper, a new bidirectional single‐phase multilevel inverter module has been proposed with a reduced number of switches along with lower voltage stresses. The proposed module generates 17 levels at the output with 10 unidirectional switches along with four dc voltage sources with two varieties of dc voltage sources. Moreover, for a higher number of levels, the cascade connection of several modules has been discussed in this paper with three different methods for the selection of dc voltage sources. The proposed module has been compared with several similar topologies, which set the benchmark of the proposed one. The operation and performance of the proposed module have been validated through several simulation and experimental results with different types of load considering a change of modulation index.

Section: Simulation Resultsmentioning

confidence: 99%

A new single‐phase cascaded multilevel inverter topology with reduced number of switches and voltage stress

Siddique

Mekhilef

Shah

et al. 2019

“…The conduction loss of the inverter is 14.56 W or 0.0045 pu. From Equation (7) and the values obtained from datasheet, the switching loss is calculated at 1 kHz switching frequency. The switching loss of the inverter is 1.21 W or 0.0012 pu.…”

Section: Switching Lossesmentioning

confidence: 99%

A novel PV fed asymmetric multilevel inverter with reduced THD for a grid‐connected system

Vanaja¹,

Stonier²

2020

Summary This paper presents a novel design of an asymmetric multilevel inverter with a very few semiconductor switches for a single‐phase grid‐connected photovoltaic (PV) system. The proposed structure consists of 14 switches and five direct current (DC) sources to produce 27 levels. The proposed structure when connected in the cascaded form generates more voltage levels. The proposed topology is superior to other multilevel inverter topologies because of its structure. It does not need any extra circuit or polarity generation circuit (H‐bridge) to come up with the negative levels. Since the proposed topology uses 5 DC sources, it can be applicable in photovoltaic farms for producing higher voltages. An efficient controller is implemented for the grid‐connected system. For obtaining high‐quality output voltage with less total harmonic distortion (THD), the pulses to the proposed inverter are obtained using selective harmonic elimination (SHE) technique. The performance of the proposed inverter is simulated and tested under steady‐state and transient conditions. A prototype of the proposed inverter is developed and investigated using a 1 − kWp solar PV plant. Simulation and experimental results prove that the proposed inverter reduces the harmonics and satisfies the IEEE519 standards.

“…In this investigation, the proposed topology stands at par with most of the other existing MLI topologies in each respect. Cost function (CF) is the other important performance parameter used to compare the different MLI topologies that estimates the total cost of MLIs depending on some factors such as TSV, peak inverse voltage (PIV), and number of power switches N sw . The CF is defined in Equation below:

CF = N_{sw} + ((), normalα * TSV) / V_{normalo, max} + ((), normalβ * PIV) / V_{normalo, max},

“α” is the weight factor of TSV versus N sw and “β” is the weight factor of PIV versus N sw .…”

Section: Comparison With Other Recent MLI Topologiesmentioning

confidence: 99%

Single‐phase Modified T‐type–based multilevel inverter with reduced number of power electronic devices

Mahato

Majumdar

Jana

2019

Summary In this research work, a generalized structure of multilevel topology is proposed that can be extended by cascading the modules. Proposed modular topology is modified T‐type structure that requires comparative reduced number of power components than other existing structures of multilevel inverter. Each module encompasses of three DC sources and 10 power switches. Both positive and negative voltage levels can be generated without the use of H‐bridge inverter; thus, lower voltage rating power switches are employed for proposed modular topology. To generate the output voltage levels, the nearest level control is implemented on the experimental setup using dSPACE 1103 controller. To verify the performance of the proposed inverter, experimental validation of various topologies based on different algorithms is performed to generate 15‐level, 17‐level, 27‐level, and 31‐level at different load conditions. Moreover, different state‐of‐art topologies are compared with proposed topology in terms of the required number of voltage levels, DC sources, power switches, driver circuits, and total standing voltage.