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The leakage currents caused by high-frequency common-mode (CM) voltage have become a major concern in transformerless photovoltaic (PV) inverters. This paper addresses to a review on dc-ac converters applied to PV systems that can avoid the circulation of leakage currents. Looking for a lower cost and higher reliability solution, a 250 W PV transformerless micro-inverter prototype based on the bipolar...
A typical distributed generation application (DG) only operates in grid-connected mode, for safety reasons. Recently, changes in Brazilian legal framework authorized islanded operation in some cases. This paper presents a dual mode LCL VSI for DG applications. The proposed system can operate in both, grid-connected or islanded, commutating between modes seamlessly. It was designed to operate with...
A novel structure based on differential boost inverter (DBI) and ladder structure of switched-capacitor (SC) is studied in this paper, which is designated as switched-capacitor differential boost inverter (SCDBI). The proposed inverter allows gains higher than unity and it extends the conversion rate of boost-type inverters. Hence, the insertion of the switched-capacitor extends the converter gain...
This paper presents a new forward inverter topology for low power applications. The proposed converter is a voltage fed inverter, which makes it suitable for renewable source integration and has current source type output, which matches with grid-connected applications. This solution combines forward based topology in continuous conduction mode, providing MPPT capability and unity power factor in...
The differential boost inverter (DBI) generates an alternating differential voltage from two dc-dc converters. The instantaneous output voltage can be higher or lower than the dc input voltage, however DBIs exhibit nonlinear control-to-output behavior in large-signal sense. Furthermore, switched capacitor cells may operate as a gain multiplier in classical converters. The integration of switched capacitors...
This paper proposes an energy management system designed to control the power flow in a hybrid microgrid composed of a 1 kWp PV array, a 1.2 kWp wind turbine, a 1.2 kW fuel cell and a 31.5 F / 250 V supercapacitor bank. The microgrid provides uninterrupted power supply of critical dc loads and it can operate in both, standalone or grid-connected modes. A power flow control strategy is proposed to...
In this work a grid-connected renewable energy system composed by a 1kW photovoltaic (PV) array and a 1 kW wind turbine (WT) is presented. The generated power from each renewable source is processed by independent dc-dc converters and provided to a common dc bus. Once batteries employment is not desired, a 1.2 kW fuel cell (FC) and a supercapacitor bank (SCB) are used as backup, in order to keep a...
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