Hybrid Topology of Asymmetric Cascaded Multilevel Inverter with Renewable Energy Sources


This paper now a binary topology of Multimodule level inverters production a staircase output voltage from renewable DC voltage sources. The MLI (Multi Level Inverter) want many number of semiconductor switches is main drawback of multilevel inverters.


The MLI can be classified as two method, one is symmetric and another asymmetric converters. In symmetrical multilevel inverter can apply same voltage level to all cascaded circuit, in asymmetric multilevel inverters can be vary input source voltage at each cascaded H-bridge by using binary algorithm. In this paper, a discrete binary topology for multilevel converters is planned using cascaded sub-multilevel Cells.


This sub-multilevel converter can generate sixty three levels of voltage from five discrete DC source. The Total Harmonic Distortions (THD) is reduce by discrete binary topology. The working action and work of the planned multilevel inverters studies has been verified by simulation of using SIMULINK / MATLAB results.


  1. Asymmetric Cascaded Multilevel Inverter
  2. Reduction Of Thyristor Switches
  3. Minimized Total Harmonic Distortions
  4. High Output Gain
  5. Discrete Binary Topology




Fig 1 General Block Diagram Of Cascaded MLI



 Fig 2 Harmonic Reduction Of Cascaded Multilevel Inverter


Fig 3 Thyristor Pair ON State Position of Positive and Negative Sine

Switching Techniques


Fig 4 Switching Techniques, Output Voltage And Gate Triggering System

(G I ,G 2,G3,G4,G5) Wave Form of Cascaded Multilevel Inverter.


Fig 5 Output Voltage and Current Wave Form of Proposed Multilevel Inverter


In this paper, a discreet binary topology was presented for cascaded multilevel Inverter, which has reduced number of thyristor switches. The suggested discreet binary topology requires limited switches for synthesized output voltages. The hybrid topology of common h-bridge cascaded multilevel inverter is proposed for variable AC output voltages and frequencies as per given source input by using reduced no of switches to half than conventional inverter. Therefore, the cost of proposed system reduced. As a result, the output voltage waveform presents very low total harmonic distortion profile and provides better efficient. The application of this project is ups and variable speed drives which result in high dynamic response for speed.


 [I] Jaison Mathew, K. Mathew, Najath Abdul Azeez, P. P. Rajeevan, and K. Gopakumar, “A Hybrid Multilevel Inverter System Based on Dodecagonal Space Vectors for Medium Voltage 1M Drives,” IEEE Transactions On Power Electronics, Vol. 28, No.8, August 2013.

[ 2] Dong Cao, Shuai Jiang, and Fang Zheng Peng, “Optimal Design of a Multilevel Modular Capacitor-Clamped DC-DC Converter,” IEEE Transactions On Power Electronics, Vol. 28, No.8, August 2013.

[3] P.Roshankumar,P.P.Rajeevan,K.Mathew,K. Gopakumar, Jose I. Leon, and Leopoldo G. Franquelo, “A Five-Level Inverter Topology with Single-DC Supply by Cascading a Flying Capacitor Inverter and an H-Bridge,” IEEE Transactions On Power Electronics, Vol. 27, No.8, August 2012.

[4] Qin Lei, Fang Zheng Peng, and Shuitao Yang, “Multiloop Control Method for High-Performance Microgrid Inverter Through Load Voltage and Current Decoupling With Only Output Voltage Feedback,” IEEE Transactions On Power Electronics, Vol. 26, No.3, March 20 II.

[5]M. R. Banaei and E. Salary, “Verification of New Family for Cascade Multilevel Inverters with Reduction of Components,” Journal of Electrical Engineering & Technology Vol. 6, No. 2, pp. 245-254, 2011 D01 :IO.5370/JEET.2011.6.2.245.

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