Journal Article10.1109/TPEL.2011.2160359
Improved Transformerless Inverter With Common-Mode Leakage Current Elimination for a Photovoltaic Grid-Connected Power System
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TL;DR: In this article, an improved single-phase inverter topology is presented to eliminate the common-mode leakage current in the transformerless photovoltaic grid-connected system, and the high efficiency and convenient thermal design are achieved thanks to the decoupling of two additional switches connected to the dc side.
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Abstract: To eliminate the common-mode leakage current in the transformerless photovoltaic grid-connected system, an improved single-phase inverter topology is presented. The improved transformerless inverter can sustain the same low input voltage as the full-bridge inverter and guarantee to completely meet the condition of eliminating common-mode leakage current. Both the unipolar sinusoidal pulsewidth modulation (SPWM) as well as the double-frequency SPWM control strategy can be applied to implement the three-level output in the presented inverter. The high efficiency and convenient thermal design are achieved thanks to the decoupling of two additional switches connected to the dc side. Moreover, the higher frequency and lower current ripples are obtained by adopting the double-frequency SPWM, and thus the total harmonic distortion of the grid-connected current are reduced greatly. Furthermore, the influence of the phase shift between the output voltage and current, and the influence of the junction capacitances of the power switches are analyzed in detail. Finally, a 1-kW prototype has been simulated and tested to verify the theoretical analysis of this paper.
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Citations
Single-Stage Bidirectional Buck–Boost Inverters Using a Single Inductor and Eliminating the Common-Mode Leakage Current
Ashraf Ali Khan,Yun W. Lu,Wilson Eberle,Liwei Wang,Usman Ali Khan,Mohammed Agamy,Honnyong Cha +6 more
TL;DR: The proposed inverters provide buck–boost operation for a wide variation of the input dc voltage and eliminate the common-mode leakage current by connecting the output neutral to the midpoint of input capacitors or directly to input voltage sources.
39
Naturally Adaptive, Low-Loss Zero-Voltage-Transition Circuit for High-Frequency Full-Bridge Inverters With Hybrid PWM
Yinglai Xia,Rajapandian Ayyanar +1 more
TL;DR: This paper proposes a low-loss, auxiliary zero-voltage-transition (ZVT) circuit to realize zero- voltage-switching (ZVS) for all the main switches of a full-bridge inverter, and inherent zero-current-switches (ZCS) turn-on and ZCS turn-off for the auxiliary switches.
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A reduced leakage current transformerless photovoltaic inverter
Kok Soon Tey,Saad Mekhilef +1 more
TL;DR: In this paper, a transformerless inverter with stable common mode voltage and reduced leakage current is proposed, and the simulation of the proposed topology is carried out in MATLAB and validated experimentally.
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An Improved H8 Topology for Common-Mode Voltage Reduction
TL;DR: An improved H8 power converter for common-mode voltage (CMV) reduction and electromagnetic interference suppression can realize zero CMV variation when entering and leaving the zero state, which is mainly achieved by both the improvement of the structure and the control strategy.
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Comparison of single-phase H4, H5, H6 inverters for transformerless photovoltaic applications
Gabriele Rizzoli,Michele Mengoni,Luca Zarri,Angelo Tani,Giovanni Serra,Domenico Casadei +5 more
- 01 Oct 2016
TL;DR: This paper tries to experimentally compare the performance of three conversion structures derived from full-bridge inverter, i.e., inverters H4, H5, and H6, each controlled with different modulation strategies, based on the same hardware platform, experimental set-up, and operating conditions.
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