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A Seven-level Inverter with Self-balancing and Low Voltage Stress ABSTRACT: Based on the switched-capacitor (SC) principle, a seven-level inverter is proposed, which can synthesize seven levels containing a single dc source. Moreover, it can further generate more levels by a cascaded extension. Meanwhile, the proposed topology does not require any sensor due to the use of SC technology. Furthermore, the capacitor voltage is self-balanced without utilizing the complicated control strategy and additional control circuits. The phase disposition pulse width modulation (PD-PWM) is adopted to reduce the total harmonic distortion (THD). The topology can generate the different levels with a wide range of modulation index. In addition, the topology can also work in overmodulation. Compared with the traditional SC multilevel inverter (MLI), the absence of H-bridge makes low-voltage stress in proposed topology. The voltage stress of all switches is not more than the input voltage. Operational principles, modulation strategy, and voltage stress analysis are discussed. Simulation and experiment are conducted in low power to verify the feasibility of the proposed topology.
KEYWORDS: 1. Multilevel inverters 2.
Low-voltage stress
3. Switched-capacitor 4. Voltage self-balancing
SOFTWARE: MATLAB/SIMULINK
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245 CIRCUIT DIAGRAM:
Fig. 1. The circuit of the proposed seven-level inverter.
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245 EXPERIMENTAL RESULTS:
Fig. 2. Simulation waveforms of the output voltage and current. (a) Output voltage and current. (b) THD of the output voltage.
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245 CONCLUSION: In this paper, the seven-level inverter is proposed by utilizing the switched capacitor technology. In addition, the inverter can be used as the basic cell to construct more output levels through a cascaded configuration. With the PD-PWM modulation, the capacitor voltage can be selfbalanced without any sensor to detect the voltage. Moreover, the topology can work in different modulation index and can generate a different number of voltage levels. The working principle and capacitor parameters are analyzed in detail. In addition, the performances are compared with the existing topologies to prove the advantages. A low-power prototype is constructed to prove the feasibility of the proposed topology, and good performance of steady and transient state is testified.
REFERENCES: [1] E. Samadaei, A. Sheikholeslami, S. A. Gholamian, and J. Adabi, “A Square T-Type (STType) Module for Asymmetrical Multilevel Inverters,” IEEE Trans. Power Electron., vol. 33, no. 2, pp. 987–996, Feb. 2018. [2] R. Barzegarkhoo, M. Moradzadeh, E. Zamiri, H. M. Kojabadi, and F. Blaabjerg, “A New Boost Switched-Capacitor Multilevel Converter with Reduced Circuit Devices,” IEEE Trans. Power Electron., vol. 33, no. 8, pp. 6738–6754, Aug. 2018. [3] M. Norambuena, S. Kouro, S. Dieckerhoff, and J. Rodriguez, “Reduced Multilevel Converter: A Novel Multilevel Converter With a Reduced Number of Active Switches,” IEEE Trans. Ind. Electron., vol. 65, no. 5, pp. 3636–3645, May. 2018. [4] S. Kouro, M. Malinowski, K. Gopakumar, J. Pou, L. G. Franquelo, B. Wu, J. Rodriguez, M. A. Pérez, and J. I. Leon, “Recent advances and industrial applications of multilevel converters,” IEEE Trans. Ind. Electron., vol. 57, no. 8, pp. 2553–2580, Aug. 2010. [5] A. Nabae, I. Takahashi, and H. Akagi, “A new neutral-point-clamped PWM inverter,” IEEE Trans. Ind. Appl., vol. IA-17, no. 5, pp. 518–523, Sep. 1981. For Simulation Results of the project Contact Us
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