Implementation of a High Efficiency Grid-Tied Multi-Level Photovoltaic Power Conditioning System Using Phase Shifted H-Bridge Modules

Jong-Pil Lee; Byung-Duk Min; Dong-Wook Yoo

Implementation of a High Efficiency Grid-Tied Multi-Level Photovoltaic Power Conditioning System Using Phase Shifted H-Bridge Modules

Jong-Pil Lee

Byung-Duk Min

Dong-Wook Yoo

Vol. 13, No. 2, pp. 296-303, Mar. 2013

10.6113/JPE.2013.13.2.296

H-bridge multilevel inverter

Photovoltaic PCS (Power Conditioning System)

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Abstract

This paper proposes a high efficiency three-phase cascaded phase shifted H-bridge multi-level inverter without DC/DC converters for grid-tied multi string photovoltaic (PV) applications. The cascaded H-bridge topology is suitable for PV applications since each PV module can act as a separate DC source for each cascaded H-bridge module. The proposed phase shifted H-bridge multi-level topology offers advantages such as operation at a lower switching frequency and a lower current ripple when compared to conventional two level topologies. It is also shown that low ripple sinusoidal current waveforms are generated with a unity power factor. The control algorithm permits the independent control of each DC link voltage with a maximum power point for each string of PV modules. The use of the controller area network (CAN) communication protocol for H-bridge multi-level inverters, along with localized PWM generation and PV voltage regulation are implemented. It is also shown that the expansion and modularization capabilities of the H-bridge modules are improved since the individual inverter modules operate more independently. The proposed topology is implemented for a three phase 240kW multi-level PV power conditioning system (PCS) which has 40kW H-bridge modules. The experimental results show that the proposed topology has good performance.

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Cite this article

[IEEE Style]

J. Lee, B. Min, D. Yoo, "Implementation of a High Efficiency Grid-Tied Multi-Level Photovoltaic Power Conditioning System Using Phase Shifted H-Bridge Modules," Journal of Power Electronics, vol. 13, no. 2, pp. 296-303, 2013. DOI: 10.6113/JPE.2013.13.2.296.

[ACM Style]

Jong-Pil Lee, Byung-Duk Min, and Dong-Wook Yoo. 2013. Implementation of a High Efficiency Grid-Tied Multi-Level Photovoltaic Power Conditioning System Using Phase Shifted H-Bridge Modules. Journal of Power Electronics, 13, 2, (2013), 296-303. DOI: 10.6113/JPE.2013.13.2.296.