Abstract
Islanding detection is an essential function for safety and reliability in grid-connected distributed generation (DG) systems. Several methods for islanding detection are proposed, but most of them may fail under multi-source configurations, or they may produce important power quality degradation which gets worse with increasing DG penetration. This paper presents an active islanding detection algorithm for Voltage Source Inverter (VSI) based multi-source DG systems. The proposed method is based on the Voltage Positive Feedback (VPF) theory to generate a limited active power perturbation. Theoretical analyses were performed and simulations by MATLAB /Simulink /SimPowerSystems were used to evaluate the algorithm’s performance and its advantages concerning the time response and the effects on power quality, which turned out to be negligible. The algorithm performance was tested under critical conditions: load with unity power factor, load with high quality factor, and load matching DER’s powers.
Highlights
The Distributed Energy Resources (DER) including Distributed Generation (DG) and Distributed Storage (DS) are, as renewable energy resources, very important to improve power distribution reliability and capability
We consider the possibility of automatic operational mode change from the grid-connected mode to the stand-alone mode when the DG system can supply the totality of the load power: in this case CB2b is opened and CB2a remains closed to allow the supply of power to the load with safety disconnection from the utility
The performance of the islanding detection method was evaluated for systems with 3 and 9 DG units operating in power factor improvement mode with different load power factors, and considering a high load quality factor
Summary
The Distributed Energy Resources (DER) including Distributed Generation (DG) and Distributed Storage (DS) are, as renewable energy resources, very important to improve power distribution reliability and capability Their penetration is increasing nowadays and their utilization shows potential for rural utility solutions [1]. The Hydrogen Research Institute (HRI) has designed and developed a renewable energy (RE) system which includes Photovoltaic (PV) arrays, Fuel Cells (FC) and Wind Turbine Generators (WTG) with an energy storage capability using electrolytic hydrogen [2]. This RE system operates presently in stand-alone mode.
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