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An islanding condition refers to an undesired event in which a portion of utility system, including both distributed generator(s) (DG) and local loads, remains energized while the main grid is disconnected. Unintentional islanding incident can result in serious personnel safety issues, interference to grid-protection facilities, power quality degradation, and equipment damage. Accordingly, anti-islanding...
This paper shows a dc-bus voltage regulation for a dc distribution system integrated with a single-phase bidirectional inverter through using a control method to operate with no grid information, and without contributing the solar DC-DC converter. This system can intelligently and efficiently operate in islanding mode when load shedding is employed to regulate the DC bus voltage with providing the...
Energy storage systems (ESS) are broadly employed to smooth out the fluctuation in the PV output caused by cloud passing, or variability of solar irradiance with a high ramp rate. This paper compares the smoothing operation, and ramp rate control in two different architectures: cascaded and parallel topologies. Parallel architecture with reduced number of power switches, simpler controller, and as...
This paper describes the design and evaluation of high current toroidal Printed Circuit Board (PCB) embedded inductor applicable for high frequency DC/AC converters (lower than 10MHz). The equivalent circuit model of the inductor is presented and the filtering effectiveness is verified by testing three different geometries with its own characteristics and function through a GaN converter. Besides,...
This paper presents the design and implementation of high power density and highly efficient air-core embedded inductor onto Printed Circuit Board (PCB) for 280W-5A/240nH, 280W-12A/150nH and 280W-18A/50nH. The toroidal structure due to its better performance on interfacing electromagnetic fields (EMI), is investigated. In addition, thermal restrictions are considered at high current capacity by reducing...
the global concern for the environment and greater increase in the demand for electricity justifies integration of electrical and thermal units in the future smart grids to improve the system efficiency and reduce costs and emissions. In the distribution networks, micro-Combined Heat and Power unit equipped with a thermal storage system is an excellent candidate to meet the electrical and thermal...
A control scheme for a distributed Inverter Molecule™ architecture is analyzed and implemented in this paper. An Inverter Molecule is a building block for a novel distributed inverter architecture suitable for PV/Battery applications which exceeds the performance metrics obtained by Central/String- inverters with or without DC/DC optimizers or by Micro-Inverters. The proposed transformerless architecture...
Islanding is an undesired event in which a portion of utility system containing both load and distributed resources remains energized while it is isolated from the remainder of the utility system. In case of islanding, successful detection is required to protect the equipment, and provide safety of the maintenance service workers. This paper shows an implementation of a novel algorithm named Locking...
This paper presents a novel active method in islanding detection for distributed generation and microgrids. The proposed method, Locking Frequency Band Exposure (LFBE) is a software-based algorithm that utilizes the microgrid frequency. When power demand in the microgrid exceeds the power generation, frequency falls and when the power demand from the grid matches very closely to that of local generation,...
A family of single-stage converters called Reconfigurable Solar Converter (RSC) is presented for integration of energy storage with a PV system where ramp-rate control and peak-shifting is desired. An algorithm designed to reduce the variability of photovoltaic (PV) power output by using a battery demonstrates the PV power output smoothing. The purpose of the battery is to add power to the PV output...
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