New Multicarrier Modulation Scheme for Harmonics Mitigation of T-Type Solar Multilevel Inverter

In today’s industrial world multilevel inverter (MLI) got a significant importance in medium voltage application and also a very potential topic for researchers. It is experienced that studying and comparing results of multilevel inverter (MLI) at distinct levels are a costlier and time consuming issue for any researcher if he fabricate different inverters for each level, as designing power modules simultaneously for different level is a cumbersome task. In this paper a flexible quotient has been proposed to recognize possible conversion of available MLI to few lower level inverters by appropriately changing microcontroller programming. This is an attempt to obtain such change in levels through simulation using MATLAB Simulink on inductive load which may also be applied to induction motor. Experimental results of pulse generation using dsPIC33EP256MC202 demonstrate the feasibility of proposed scheme. Proposed flexible quotient successfully demonstrates that a five-level inverter may be operated as three and two levels also. The paper focuses on odd levels only as common mode voltage (CMV) can be reduced to zero and performance of drives is better than even level. Simulated and experimental results are given in paper.

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A Modulation Scheme for Floating Source Multilevel Inverter Topology with Increased Number of Output Levels

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v6i5.10492 ◽

2016 ◽

Vol 6 (5) ◽

pp. 1985 ◽

Cited By ~ 1

Author(s):

Hussain M. Bassi

Keyword(s):

Substantial Reduction ◽

Multilevel Inverter ◽

Modulation Scheme ◽

Sinusoidal Wave ◽

Switching Scheme ◽

Multilevel Inverters ◽

Modulation Technique ◽

Multi Level ◽

Inverter Topology ◽

Switching Devices

<p>This paper presented and studied a new switching scheme for floating source multilevel inverters to produce more levels with the same number of switching devices. In the proposed scheme, the function of the dc sources, except the inner one, is to build up square wave or blocks that is close in the shape to the desired sinusoidal wave. The job of the inner switching devices is to increase the number of the levels to produce smother sinusoidal wave in the inverter output. This job can be done by adding or subtracting the value of the inner dc source to/from the blocks. The topology used in this paper is based on the conventional floating source multi-level inverter using two legs. This topology and modulation technique show substantial reduction in the total harmonics distortion when the modulation technique is the hybrid method. The performance of the proposed switching scheme in generating more levels has been evaluated by PSCAD/EMTDC simulation.</p>

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Realization of a Generalized Switched-Capacitor Multilevel Inverter Topology with Less Switch Requirement

Energies ◽

10.3390/en13071556 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1556 ◽

Cited By ~ 2

Author(s):

Anzar Ahmad ◽

MU Anas ◽

Adil Sarwar ◽

Mohammad Zaid ◽

Mohd Tariq ◽

...

Keyword(s):

Output Voltage ◽

Multilevel Inverter ◽

Basic Unit ◽

Modulation Scheme ◽

Switched Capacitor ◽

Level Control ◽

Active Components ◽

Proposed Model ◽

Environment Simulation ◽

The Cost

Conventional multilevel inverter topologies like neutral point clamped (NPC), flying capacitor (FC), and cascade H bridge (CHB) are employed in the industry but require a large number of switches and passive and active components for the generation of a higher number of voltage levels. Consequently, the cost and complexity of the inverter increases. In this work, the basic unit of a switched capacitor topology was generalized utilizing a cascaded H-bridge structure for realizing a switched-capacitor multilevel inverter (SCMLI). The proposed generalized MLI can generate a significant number of output voltage levels with a lower number of components. The operation of symmetric and asymmetric configurations was shown with 13 and 31 level output voltage generation, respectively. Self-capacitor voltage balancing and boosting capability are the key features of the proposed SCMLI structure. The nearest level control modulation scheme was employed for controlling and regulating the output voltage. Based on the longest discharging time, the optimum value of capacitance was also calculated. A generalized formula for the generation of higher voltage levels was also derived. The proposed model was simulated in the MATLAB®/Simulink 2016a environment. Simulation results were validated with the hardware implementation.

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An Improved Low Switching Frequency Modulation Scheme for a Symmetric CCS-Multilevel Inverter

International Journal of Power Electronics ◽

10.1504/ijpelec.2021.10022686 ◽

2021 ◽

Vol 12 (1) ◽

pp. 1

Author(s):

Deepa Thangavelusamy ◽

Rakesh Kumar

Keyword(s):

Frequency Modulation ◽

Multilevel Inverter ◽

Modulation Scheme ◽

Switching Frequency

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Component Count Reduced, Filter-Less H-Bridge Multilevel Inverter with Series and Parallel Connected Switches

Journal of Circuits System and Computers ◽

10.1142/s0218126621500523 ◽

2020 ◽

pp. 2150052

Author(s):

M Vijayakumar ◽

S. M. Ramesh

Keyword(s):

Pulse Width Modulation ◽

Harmonic Distortion ◽

Sine Wave ◽

Multilevel Inverter ◽

Level Shift ◽

Modulation Scheme ◽

Power Switching ◽

Power Switches ◽

Driver Circuit ◽

Gate Driver

This paper introduces a new premium multilevel inverter (MLI) topology with cascaded H-Bridge and series-parallel connected switches to synthesize the fundamental sine wave with various levels of voltage. The component count is decreased by reducing the number of power switching devices, optoisolators, voltage gate drivers, snubber and filter circuits. The combination of two power switches and a separated DC (SDC) source is called an SDC module. Five SDC modules are required for a 63-level MLI and six SDC modules are required for a 127-level MLI. In this paper, both a 63-level and a 127-level filter-less single-phase MLIs are deliberated. The switches are controlled by employing a newer pulse width modulation (PWM) technique called periodic reduced digital carrier level shift PWM (PRDCLSPWM). As the number of levels increases to a greater extent, the total harmonic distortion diminishes without the need of filter circuit and the performance level also increases. Comparative analysis of proposed 63-level and 127-level MLIs topology with the conventional and modern topologies has been presented in terms of power switches, gate driver circuit requirement, DC voltage sources and THD limits. PRDCLSPWM scheme is derived and analyzed for the proposed 63-level and 127-level MLIs to eliminate low-order and high-order harmonics. Moreover, the performance of the proposed modulation scheme is compared with the most commonly used schemes. The modeling and simulation are done with MATLAB/SIMULINK 2016a.

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