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The distribution grid is mainly built on a radial configuration where power is coming from one transformer substation to supply clients. Up to recently, in the rare cases where distributed generation existed, it was almost exclusively constituted of rotating machines, which have quite a different behaviour under fault than inverter-based sources. Consequently, current connection impact assessments...
This paper addresses the topic of utility-oriented deployment of distributed energy resources (DERs) including both distributed generation (DG) and storage (DS) in distribution networks. This application has recently attracted vast attention among many utilities in North America in support of current trends toward development of smart grids and active networks. The main focus of this paper is the...
Sustainable (renewable) energy market is stimulated by political and economical pressure to reduce ldquogreenhouse gasesrdquo emissions (United Nations Kyoto Protocol, signed by 169 countries, representing 61.6% of emissions, on December 2006), and the necessity to decrease oil demand dependency. This pressure translates into a rapidly increasing number of alternative energy financial and legislation...
Planned islanding application, also known as intentional islanding, is an early utility adaptation of the Microgrid concept that is being promoted by major utilities around the world. The main objective of planned islanding projects in Canada is to enhance customer-based power supply reliability on rural feeders by utilizing an appropriately located independent power producer (IPP). This paper considers...
Based on current utility practice, anti-islanding protection is one of the main protection requirements for interconnection of a distribution generation (DG) to the medium and low voltage grids. For connecting a small synchronous generator to the utility grid, DG interconnection guidelines require the use of a transfer-trip scheme when the minimum load of a connecting feeder is less than twice the...
This paper introduces an energy-flow model developed for performance analysis and unit sizing of an autonomous wind-diesel microgrid. A remote community in Canada is used as the study system, for which a medium penetration wind power plant has been integrated into a system served by a diesel plant with three equally sized diesel generators. Based on field observations and monitored data for almost...
This paper provides an overview of the present and future status of distributed generation (DG) and wind energy in Canada. Emphasis is placed on the role that these technologies presently play in the modern power system structure, through discussion of four Canadian case studies. The role of Natural Resources Canada in removing barriers and facilitating greater introduction of these resources is presented...
This paper introduces a distribution network benchmark for investigation of alternative distribution system planning approaches. The benchmark system is part of a 25-kV distribution network serviced by a Canadian utility company and includes a significant amount of distributed generation (DG) sources. The benchmark is used to study under-voltage problems experienced by the utility company which are...
This paper presents an adaptive approach for reactive current extraction and adaptive shunt compensation of a three-phase system under unbalanced and time-varying frequency conditions. The reactive current component is extracted based on the concept of instantaneous symmetrical components. The extracted signals are then utilized by a shunt, PWM, voltage-sourced converter to adaptively compensate the...
Summary form only given. This paper investigates (i) preplanned switching events and (ii) fault events that lead to islanding of a distribution subsystem and formation of a microgrid. The microgrid includes two distributed generation (DG) units. One unit is a conventional rotating synchronous machine and the other is interfaced through a power electronic converter. The interface converter of the latter...
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