نام فایل: Transformerless Inverter for Single-Phase Photovoltaic Systems
ارسال کننده: Reza_Fallah
فایل ارسال شده: چهارشنبه ۲۶ خرداد ۸۹ - ۱۰:۲۶
بخش فایل: برق و الکترونیک
نویسنده: Roberto González, Jesús López, Member, IEEE, Pablo Sanchis, Member, IEEE, and Luis Marroyo, Member, IEEE
Abstract:
When no transformer is used in a grid-connected photovoltaic (PV) system, a galvanic connection between the grid and the PV array exists. In these conditions, dangerous leakage current (common-mode currents) can appear through the stray capacitance between the PV array and the ground. In order to avoid these leakage currents, different inverter topologies that generate no varying common-mode voltages, such as the half-bridge andthe bipolar pulsewidth modulation (PWM) full-bridge topologies,have been proposed. The need of a high-input voltage represents an important drawback of the half-bridge. The bipolar PWM full bridge requires a lower input voltage but exhibits a low efficiency.This letter proposes a new high-efficiency topology that generates no varying common-mode voltage and requires the same low-input voltage as the bipolarPWMfull bridge. The proposed topology has been verified in a 5-kW prototype with satisfactory results.Index Terms—DC–AC power conversion, photovoltaic (PV)
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