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16. A Dual Buck Three-Level PV Grid-Connected Inverter

Author

Jianhua Wang, Ji Baojian, Shengming Huang, and Feng Hong

Subjects
Engineering, business.industry, Ground, Photovoltaic system, law.invention, Capacitor, Control and Systems Engineering, law, MOSFET, Electronic engineering, Inverter, Electrical and Electronic Engineering, business, Transformer, Diode, Voltage
Abstract

The use of a PV grid-connected inverter with non-isolated topology and without a transformer is good for improving conversion efficiency; however, this inverter has become increasingly complicated for eliminating leakage current. To simplify the complicated architecture of traditional three-level dual buck inverters, a new dual Buck three-level PV grid-connected inverter topology is proposed. In the proposed topology, the voltage on the grounding stray capacitor is clamped by large input capacitors and is equal to half of the bus voltage; thus, leakage current can be eliminated. Unlike in the traditional topology, the current in the proposed topology passes through few elements and does not flow through the body diodes of MOSFET switches, resulting in increased efficiency. Additionally, a multi-loop control method that includes voltage-balancing control is proposed and analyzed. Both simulation and experimental results are demonstrated to verify the proposed structure and control method.

Published
2015

17. An Inherent Zero-Voltage and Zero-Current-Switching Full-Bridge Converter with No Additional Auxiliary Circuits

Author

Wang Hongbo, Ji Baojian, Chen Naifu, Jun You, and Jianhua Wang

Subjects
Engineering, Inherent zero, business.industry, Bipolar junction transistor, Electrical engineering, Topology (electrical circuits), Insulated-gate bipolar transistor, Full bridge converter, Control and Systems Engineering, Control system, Hardware_INTEGRATEDCIRCUITS, Electronic engineering, Electrical and Electronic Engineering, business, Voltage, Electronic circuit
Abstract

An inherent zero-voltage and zero-current-switching phase-shifted full-bridge converter with reverse-blocking insulated-gate bipolar transistor (IGBT) or non-punch-through IGBT is proposed in this paper. This converter not only ensures that the switches in the lagging leg works at zero-current switching, but also minimizes circulating conduction loss without any additional auxiliary circuits. A 1.2 kW hardware prototype is designed, fabricated, and tested to verify the proposed topology. The control loop design procedures with small-signal models are also presented. A simple, low-cost, and robust democratic current-sharing circuit is also introduced and verified in this study. The proposed converter is a suitable alternative for compact, cost-effective applications with high-voltage input.

Published
2015

20. Three‐bridge buck inverter

Author

Hong, Feng, primary, Liu, Jun, additional, Ji, Baojian, additional, Zhou, Yufei, additional, Wang, Jianhua, additional, and Wang, Chenghua, additional

Published
2016
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