Abstract
One of the state-of-the-arts of smart grid system is the concept of networked microgrid that provides flexible integration and coordination of distributed renewable energy resources in multiple microgrids. However, due to the variable nature of renewable generations, load changes and grid contingencies, the system suffers from significant fluctuations of power, voltage and frequency. This paper seeks to present comprehensive converter control solutions for power sharing coordination and stabilization of voltages and frequency to ensure high power quality and reliability in a networked microgrid system regardless of its grid-connected and islanded modes of operation. The control solutions are provided in d-q axes for both active and reactive powers. The multilevel inverter topology that is designed to interface the distributed energy resources results in better suppression of output harmonics compared to that with a conventional 2-level inverter. The paper also features an interlinking algorithm framework of particle swarm optimization (PSO) to tune the control parameters for the optimized performance of converters. A prototype of grid-connected system of three microgrids is simulated in PSCAD platform to validate the efficacy of the proposed solution.
Highlights
Thegrowing number of microgrids due to the increased penetration of renewable energy sources (RES) has emerged the concept of networked operation of different self-governed microgrids in the modern power systems worldwide
The Voltage Source Inverters (VSI) are selected as 3-level VSIs having PWM switching through insulated-gate bipolar transistors (IGBT)
The microgrids can be operated in both grid or islanded mode with the help of an inter-tie breaker common connection that is provided to isolate the microgrids from the main grid during natural disasters, maintenances etc
Summary
Thegrowing number of microgrids due to the increased penetration of renewable energy sources (RES) has emerged the concept of networked operation of different self-governed microgrids in the modern power systems worldwide. Microgrids (MGs) serve as essential electrical infrastructures to integrate these cheap and clean distributed energy resources (DERs) by considerably reducing the harmful alternatives like coal fired and nuclear power plants that got CO2, SO2 and other polluted emissions [2]. While microgrids, in their grid-mode of operation, ensure cost-effective power quality by exporting and importing to the main grid as singular entities, they provide uninterrupted power supply to the potential customers under.
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