This paper presents the development, design and construction of a 3 kVA bidirectional AC-DC electronic converter, CEP-AC-DC, which can operate as a stand-alone or grid-connected inverter. This system is part of a micro smart grid R&D... more
This paper presents the development, design and construction of a 3 kVA bidirectional AC-DC electronic converter, CEP-AC-DC, which can operate as a stand-alone or grid-connected inverter. This system is part of a micro smart grid R&D program (REILAC) at the Automation and Control Systems Laboratory (LAC, Universidad Nacional de Rosario). The inverter's main purpose is to link a 300 VDC bus installed in the LAC with the 3x380 VAC+N 50 Hz utility grid. The project includes the construction of the converter, the design of a LCL output filter, the design and construction of electronic measurement and signal conditioning boards, the development and programming of the MCU firmware for the voltage-oriented control (VOC) modulation, control loops and PLL synchronization, the definition and implementation of accurate protections and the wiring and assembly of the equipment. A description of the whole system is provided, along with details of its component subsystems and selection criteria. Some experimental results are shown illustrating the performance of the converter, the filter, and the PLL.
