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
Quasi-resonant DC-link H5 PV inverter
Behnam Fazlali,Ehsan Adib +1 more
TL;DR: This study proposes a transformer-less PV inverter by adapting a proper quasi-resonant DC-link technique to the H5 topology, and operation characteristics, soft switching conditions and design rules are confirmed.
Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review
Adyr A. Estévez-Bén,Alfredo Alvarez-Diazcomas,Gonzalo Macias-Bobadilla,Juvenal Rodríguez-Reséndiz +3 more
TL;DR: The main topologies and strategies used to reduce the leakage current in transformerless schemes are summarized, highlighting advantages and disadvantages and establishing points of comparison with similar topologies.
Single-Carrier Modulation for Neutral-Point-Clamped Inverters in Three-Phase Transformerless Photovoltaic Systems
TL;DR: In this paper, a single-carrier modulation strategy is proposed for three-level neutral-point-clamped inverters in three-phase transformerless photovoltaic systems.
A Zero-Voltage-Transition HERIC-Type Transformerless Photovoltaic Grid-Connected Inverter
Hua F. Xiao,Li Zhang,Yanqing Li +2 more
TL;DR: A zero-voltage-transition highly efficient and reliable inverter concept (ZVT-HERIC) in transformerless photovoltaic grid-connected applications is derived from proposed basic resonant cells to explore the soft-switching region, voltage gain, as well as voltage and current stresses.
Design of A Single-Phase Transformerless Grid-Connected PV Inverter considering Reduced Leakage Current and LVRT Grid Codes
F. Mohammadi,J. Milimonfared,H. Rastegar,M. Farhadi-Kangarlu +3 more
Abstract: A new single-phase transformerless grid-connected PV inverter is presented in this paper. Investigations in transformerless grid-connected PV inverters indicate the existence of the leakage current is directly related to the variable common-mode voltage (CMV), which is presented in detail. On the other hand, in recent years it has become mandatory for the transformerless grid-connected PV inverters to satisfy new grid-codes such as low-voltage ride-through (LVRT) capability via injecting reactive power during grid faults. Therefore, in this paper, the design of the proposed topology is based on retaining the constant CMV to suppress the leakage current and also to provide reactive power injection capability during grid faults. The control strategies for injecting reactive power in the LVRT condition are also examined. To validate the presented theoretical concepts, the performance and dynamic response of the proposed transformerless PV inverter are investigated by MATLAB/Simulink and the simulation results are presented and discussed.
References
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