An Islanding Detection Technique for Inverter-Based Distributed Generation in Microgrids

Abstract

This article proposes a new passive islanding detection technique for inverter-based distributed generation (DG) in microgrids based on local synchrophasor measurements. The proposed method utilizes the voltage and current phasors measured at the DG connection point (point of connection, PoC). In this paper, the rate of change of voltages and the ratio of the voltage and current magnitudes (VoI index) at the PoC are monitored using micro-phasor measurement units. The developed local measurements based decentralized islanding detection technique is based on the VoI index in order to detect any kind of utility grid frequency fluctuations or oscillations and distinguishing them from islanding condition. The simulation studies confirm that the proposed scheme is accurate, robust, fast, and simple to implement for inverter-based DGs.

Evaluation of Passive Islanding Detection Methods for Line to Ground Unsymmetrical Fault in Three Phase Microgrid Systems: Microgrid Islanding Detection Method

“…But in islanding mode, DGs cannot inject reactive power to the load, as DGs operate at unity power factor, because the load behaves like a resistance [13], since the load resonance frequency is equal to the system frequency at the PCC. Hence, to find more deviations in frequency, the load selected is parallel RLC with a high quality factor of 1.8 in islanding mode [14,15]. The quality factor is given by:…”

Analytical Approach to Understanding the Effects of Implementing Fast-Frequency Response by Wind Turbines on the Short-Term Operation of Power Systems

“…There, the measured frequency, voltage, and current are used by the proposal to successfully discriminate the islanding and non-islanding operating mode, as it is evidenced by simulation results on the IEEE 13-bus distribution system. Examples of active islanding detection methods are presented in [16,17], where an advanced method based on synchronized injection of small AC-signals and a control algorithm based on the observation and disturbance technique are proposed, respectively. Finally, ref [18] reports a communication-based islanding detection algorithm, where an intelligent micro-phasor measurement unit is leveraged for islanding detection.…”

Aprovechamiento de Sistemas de Almacenamiento Energético Mediante Baterías para la Mitigación de Desequilibrios en Microrredes Eléctricas

“…En la arquitectura de una microrred, las unidades de generación pueden localizarse más cerca de los consumidores (a nivel del sistema de distribución), tener un tamaño sensiblemente inferior que las grandes centrales convencionales y facilitar la diversificación de su fuente energética primaria (renovable no convencional, en su mayoría), de tal forma que la energía producida fluya desde los generadores hacia las cargas, sin tener que pasar por el sistema de transmisión, lo que reduce tanto las pérdidas energéticas como el nivel de congestión de la infraestructura. Este paradigma de generación recibe el nombre de "generación distribuida", cuyos beneficios ambientales, gracias a la reducción en la quema de combustibles fósiles, y técnicos, por la reducción de pérdidas y el aumento en la continuidad del suministro eléctrico, han sido discutidos ampliamente en la literatura de este campo disciplinar (Karimi et al, 2021;T. P. Kumar et al, 2015;Saponara et al, 2019).…”