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A Hybrid Boundary Conduction Modulation for a SinglePhase H-bridge Inverter to Alleviate Zero-Crossing Distortion and Enable Reactive Power Capability ABSTRACT: Boundary Conduction Modulation (BCM) featuring zero voltage switching has caught researchers’ eyes recently. In single-phase full-bridge inverter with one leg operating in high switching frequency and one leg in line frequency, it is easy to achieve high conversion efficiency for low power applications. However, severe distortion will be introduced during zero voltage crossing area due to too low switching frequency around this area, and reactive power generation is not allowed under this modulation scheme due to zero voltage crossing issue. This paper proposes a hybrid BCM strategy for a single-phase full-bridge inverter to both alleviate voltage zero-crossing distortion and enable reactive power generation by reshaping the triangular waveform of inductor current into quadrangle waveform through rearranging the driving signals during voltage zero crossing area. This alleviates zero-crossing distortion by avoiding too low switching frequency and enables reactive power generation by employing the hybrid BCM around voltage zero crossing area. High efficiency can be maintained by combining the proposed hybrid BCM employed only for a small portion of zero crossing area and the conventional BCM for the rest. The principle of operation, theoretical analysis and simulation results are presented in this paper. A 300W microinverter prototype was built to verify the feasibility and effectiveness of the proposed hybrid BCM scheme.
KEYWORDS: 1. Microinverter 2. BCM operation 3. Hybrid modulation strategy For Simulation Results of the project Contact Us
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
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High efficiency
SOFTWARE: MATLAB/SIMULINK CIRCUIT DIAGRAM:
Fig. 1. The control diagram of the prototype proposed.
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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. The simulated wave forms of inverter operated in the proposed control scheme (a) full load (b) half load.
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
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Fig. 3. The simulated waveforms of BCM inverter when output reactive power. (a)output current leads grid voltage 30o phase. (b)output current lags grid voltage 30o phase.
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
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Fig. 4. The detailed wave forms of hybrid BCM when output reactive power.
CONCLUSION: This paper proposes a hybrid BCM for single-phase full bridge inverters to both overcome the current distortion at voltage zero-crossing region and have capability of reactive power generation. By combining the proposed hybrid BCM and unipolar BCM, the inverter will alleviate the current distortion without lowering efficiency. The hybrid modulation scheme is explained in details and the design considerations are also given for selecting control parameters and driving signal arrangement. To verify the proposed control scheme, a two-stage 300W microinverter prototype has been built. Simulation and experimental results verify the feasibility and effectiveness of the proposed control scheme.
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245 REFERENCES: [1] Z. Zhang, X. F. He, and Y. F. Liu, “An optimal control method for photovoltaic grid-tiedinterleaved flyback microinverters to achieve high efficiency in wide load range,” IEEE Trans. Power Electron., vol. 28, no. 11,pp. 5074–5087, Nov. 2013. [2] D. M. Scholten, N. Ertugrul, and W. L. Soong, “Micro-inverters in small scale PV systems: A review and future directions,” in Proc. Australas. Univ. Power Eng. Conf., Hobart, Tas., Australia, 2013, pp. 1–6. [3] Z. Zhang, M. Chen, W. Chen, C. Jiang, and Z. Qian, “Analysis and implementation of phase synchronization control strategies for BCM interleaved flyback microinverters,” IEEE Trans. Power Electron., vol. 29, no. 11, pp. 5921–5932, Nov. 2014. [4] R. C. Beltrame, J. R. Zientarski, M. L. Martins, and J. R. Pinheiro, “Simplified zero-voltagetransition circuits applied to bidirectional poles: Concept and synthesis methodology,” IEEE Trans. Power Electron., vol. 26, no. 6, pp. 1765–1776, Jun. 2011. [5] C. M. de Oliveira Stein, H. A. Grundling, H. Pinheiro, J. R. Pinheiro, and H. L. Hey, “Zerocurrent and zero-voltage soft-transition commutation cell for PWM inverters,” IEEE Trans. Power Electron., vol. 19, no. 2, pp. 396–403, Mar. 2004.
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