A novel cross-connected multilevel inverter topology for higher number of voltage levels with reduced switch count

Prem, P.; Sugavanam, Vidyasagar; Abubakar, Ahamed Ibrahim; Ali, Jagabar Sathik Mohamed; Boopathi, C. S.; Vijayakumar, K.; Padmanaban, Sanjeevikumar

doi:10.1002/2050-7038.12381

Cited by 29 publications

(22 citation statements)

References 24 publications

(63 reference statements)

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“…Similarly, the power loss while the switch is turning off can be determined using (17) The total loss per switching state will be the sum of (16) and (17). Here f s is the switching frequency of the switch, V swb is the blocking voltage across the switch, I swc is the conduction current through the switch, t on and t off are the time required for the switch to turn ON and turn off respectively.…”

Section: ) Switching Lossmentioning

confidence: 99%

“…The total loss per switch (P LS) per switching state is the sum of equations (16) to (18). So, the total power loss across the inverter is…”

Section: ) Conduction Lossmentioning

confidence: 99%

“…However, in the symmetric mode, it can offer only nine levels with 10 switches; also, it requires multiple independent sources, and for the addition of every source, two more switches will be added in the circuit. A cross-connected multilevel inverter is suggested in [16], but it requires cascading for asymmetric operation. The DS-MLI suggested in this article addresses the above concerns with its ability to operate in symmetric and asymmetric modes without cascading and with fewer components.…”

Section: Introductionmentioning

confidence: 99%

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A New Multilevel Inverter Topology With Reduced Power Components for Domestic Solar PV Applications

Prem¹,

Sivaraman²,

Almakhles

et al. 2020

IEEE Access

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Power electronic converters are used to nullify the input fluctuations from a solar photovoltaic unit due to intermittent solar irradiance and to make the terminal voltage grid compatible with desired frequency. The conventional two-level converters suffer from low power quality and high voltage stress. In this paper, a new multilevel inverter topology called Dual Source Multilevel Inverter (DS-MLI) with fewer power switches is proposed for solar PV power conversion systems. It is capable of operating in symmetric and asymmetric operating modes without the need for cascading. This reduces the switching components required to produce a given number of levels in the staircase voltage waveform. A closed-loop control algorithm is designed using the state-space averaging technique, and the dynamic behavior of the system under step change is assessed. The simulation is carried out in MATLAB environment. The experimental prototype of DS-MLI rated 1 kW is fabricated using FGA25N120-ANTD IGBTs, and an eco-sense made solar PV emulator is used for analyzing the performance of DS-MLI while interfacing with solar PV unit. The suggested scheme is compared with its conventional counterpart in the aspects of components required, cost and efficiency and the results are presented INDEX TERMS DS-MLI, Multilevel inverter, Solar PV, Power Conversion, Fundamental frequency switching.

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Section: ) Switching Lossmentioning

confidence: 99%

“…The total loss per switch (P LS) per switching state is the sum of equations (16) to (18). So, the total power loss across the inverter is…”

Section: ) Conduction Lossmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A New Multilevel Inverter Topology With Reduced Power Components for Domestic Solar PV Applications

Prem¹,

Sivaraman²,

Almakhles

et al. 2020

IEEE Access

Self Cite

View full text Add to dashboard Cite

show abstract

“…[8][9][10][11][12] However, the second group of topologies cannot generate negative polarity voltage and requires an additional cell like an H-bridge or a developed H-bridge to produce the negative voltage levels at the output stage. [13][14][15][16][17][18] The advantage of the second group's topologies toward the first group's topologies is the reduced count of required switches; however, according to the increased blocking voltage on H-bridge or developed H-bridge cells' switches, the topology's size and cost may be increased. In the existing topologies in previous works, 9,10,13,14,17 there are bidirectional switches.…”

Section: Introductionmentioning

confidence: 99%

Cascaded multilevel inverter based on ladder bridges: Analysis, optimization, and implementation

Aalami

Hadiizadeh

Babaei

2021

Circuit Theory & Apps

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This paper proposes a new ladder-switch based cascaded multilevel inverter that requires a lower number of insulated gate bipolar transistors (IGBTs) and direct current (DC) voltage sources to generate a specified range of voltage levels. Regarding this topology, it consists of λ stages, where each stage comprises k legs, besides each leg composed of n cells. So, the proposed topology can be optimized to obtain the lower requirement for IGBTs and DC voltage sources. It is required to mention that this topology generates both negative and positive voltage levels inherently. Two different algorithms are presented to synthesize all odd and even voltage levels. After, regarding each of the algorithms, the proposed topology is optimized from different aspects of the lowest number of IGBTs or the lowest number of DC voltage sources, and results are depicted. A comparison assessment is performed to find the advantages and possible disadvantages of the proposed topology. In the end, a 23-level prototype of the proposed topology is used to validate the correct performance of the proposed topology using the experimental results.

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“…Basically, the control techniques are classified as low‐frequency or fundamental frequency and high‐frequency or pulse width modulation (PWM) techniques. When compared with the PWM based control techniques, the output obtained with the fundamental frequency control techniques are having many advantages, 17,35‐41 like low switching losses, high fundamental component in output waveform, low dv / dt , low electromagnetic interference issues, and high converter efficiency, etc. However, the fundamental frequency methods are having slow dynamic response, and are mainly used in high‐power applications such as FACT devices and HVDC systems 36,42‐45 .…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of switching angle calculation methods for multilevel inverters

Muthyala

Dhabale

2021

Int Trans Electr Energ Syst

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Summary A multilevel inverter produces an output to approximate a desired sine wave. The closeness of the output waveform to the sine wave depends on the logic applied for switching angle calculation, resulting in different switching angle calculation methods. In this paper, various switching angle calculation methods are compared based on of the parameters quantifying the quality of the output waveform. The main focus of this work is on the study of convergence of the output waveform to a smooth waveform as number of levels increases theoretically. The convergence is analytically proved and validated numerically by computing up to 201 levels. Also, a parameter quantifying the deviation of the output waveform from the sine wave is defined, and its closed form expression is derived. This parameter is strongly correlated to and computationally less expensive than the total harmonic distortion. Hence, the deviation is proposed as a better measure of the quality of the output wave form. The convergence and the deviation of the output waveform are also used as the basis of the comparison of different switching angle calculation methods. These two give a better insight into the switching angle calculation methods. The analysis presented in this paper provides a good understanding of various switching angle computation methods and helps in choosing an appropriate method for a given application.

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A novel cross-connected multilevel inverter topology for higher number of voltage levels with reduced switch count

Cited by 29 publications

References 24 publications

A New Multilevel Inverter Topology With Reduced Power Components for Domestic Solar PV Applications

A New Multilevel Inverter Topology With Reduced Power Components for Domestic Solar PV Applications

Cascaded multilevel inverter based on ladder bridges: Analysis, optimization, and implementation

Comparative analysis of switching angle calculation methods for multilevel inverters

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