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In this paper, a modified droop control combined with power-line signaling is applied to several public dc street/road lighting microgrids with microgeneration and storage capability. The idea is to communicate low-level microgrid's main converter with the battery management system (BMS) injecting a high-frequency signal into the dc bus. Depending on the value of this frequency, the batteries will...
This paper presents a multifunctional bidirectional converter applied to street lighting and photovoltaic (PV) microgeneration systems. The proposed converter works as an electronic driver supplying a street lighting luminaire based on light emitting diodes (LEDs) at night, from ac single-phase mains with high power factor and reduced harmonic distortion. During daylight hours, the converter injects...
Most common Power Factor Correction (PFC) solutions for low power applications, when galvanic isolation is required, involve the use of discontinuous conduction mode (DCM) dc to dc topologies. The control is generally based on fixed duty ratio operation, or at best, on a classic low-bandwidth duty-ratio control. Considering public lighting systems, in which a high number of low power converters are...
This paper defines, explains and implements a unified switching pattern for the switches in a bidirectional Discontinuous Conduction Mode (DCM) Flyback converter, used for connecting the individual elements of a street lighting system to the mains facility. In every individual element, the DC bus links the different existing stages, such as lamp driver, energy storage stage, power generation stage...
This paper presents a multifunctional bidirectional converter. The proposed converter works as a grid-tied inverter, injecting power coming from a PV subsystem to the AC mains in the daytime hours, but also supplies energy to a LED-based street lighting system at night. The topology is based on the integration of two Flyback converters thus allowing the desired bidirectional energy flux. Each Flyback...
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