This paper analyses the performance of a lowvoltage microgrid, based on microturbines, and presents new control algorithms to improve the efficiency and reliability of microgrids. Due to the importance of islanding and focusing on the efficiency and the harness of the heat of the exhaust gasses in islanded operation mode, a new control algorithm has been developed. Additionally, a new control s...

1. Project Goals FREEDM system consists of SST, FID, DESD, DRER, and DGI. The SST-based microgrid system can have many functionalities using communication capability provided by DGI and other components such as DESD, DRER, and DESD. A new type of islanding and seamless reconnection strategies are developed to cope with the case when the utility grid is disconnected and to increase stability and...

The resilient operation of microgrids (MGs) relies strongly on their ability to operate in islanded mode, autonomously from the bulk grid, whilst adhering secure requirements. Catastrophic events transmission grid can lead abrupt MG islanding accommodated by large frequency and voltage excursions due power imbalances within MG. It is vital that scheduling algorithms incorporate both static tran...

-An active islanding detection method based on Frequency-Locked Loop (FLL) for constant power controlled inverter in single-phase microgrid is proposed. This method generates a phase shift comparing the instantaneous frequency obtained  from FLL unit with the nominal frequency to modify the reference phase angle. An initial low frequency variable triangular disturbance is added to the phase sh...

-An active islanding detection method based on Frequency-Locked Loop (FLL) for constant power controlled inverter in single-phase microgrid is proposed. This method generates a phase shift comparing the instantaneous frequency obtained  from FLL unit with the nominal frequency to modify the reference phase angle. An initial low frequency variable triangular disturbance is added to the phase sh...

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 ...

In this article, a risk-constrained stochastic framework is presented for joint energy and reserve scheduling of resilient microgrid considering demand side management. The optimization problem formulated to schedule the system operation in both normal islanding modes by addressing prevailing uncertainties duration as well prediction errors loads, renewable power generation, electricity price. ...

Distribution systems can form islands when faults occur. Each island represents a subsection with variable boundaries subject to the location of a fault(s) in the system. A subsection with variable boundaries is referred to as island in this paper. For operation in autonomous mode, it is imperative to detect the island configurations and stabilize these subsections. This paper presents a novel ...

Recent deployment of distributed generation has led to a revolution in distribution systems and the emergence of “smart grid” concepts. Smart grid mainly intends to facilitate integration of renewable energy sources and to achieve higher system reliability and efficiency. Different distributed generation types found in modern distribution systems can be classified into two main categories: inte...

In this paper, three approaches to increasing power system security are presented which are particularly relevant with respect to emerging fundamental changes in the operation paradigms of electric grids. Special attention is given to the challenge of maintaining system stability and security of supply in the presence of distributed and fluctuating renewable power generation and the integration...