Decentralised control of DC microgrid based on virtual admittance to enhance DC voltage and grid frequency support

DC microgrid technology has become one of key smart grid research topics in recent years. In comparison to AC microgrids, DC microgrids are more manageable to operate in grid-connected and islanded modes, and also offering improved efficiency and better controllability. Services, such as voltages and AC system frequency support can also be potentially provided by optimally controlling the DC microgrids converter interfaces and their local distributed energy resources. These will require a good understanding of the dynamic interactions between the DC microgrid and the host AC system, and implementation of the appropriate control strategies. This paper investigates the dynamic resilience of a DC microgrid connected to an AC system under different frequency and voltage disturbances. A decentralised droop control strategy within the DC microgrid is used for fast active power control and wider system frequency support. A virtual admittance method is also utilised to enhance the local DC microgrid voltages during the AC frequency events and DC fault test scenarios. The effectiveness of the control strategy is evaluated by simulation studies in MATLAB/Simulink

Predictive capabilities of linearised models for converter-interfaced battery storage in LV networks

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Assessment of passive islanding detection methods for DC microgrids

This paper provides an assessment of passive islanding detection methods in DC microgrids. In order to analyse the response of a DC microgrid to an islanding event, DC voltage and current signatures are captured locally at the terminals of Distributed Energy Resources (DERs). Further analysis on DC voltage and current measurements is carried out to derive the Rate of Change of Voltage (ROCOV) and the Rate of Change of Current (ROCOC), to distinguish between genuine islanding events and other disturbances. A detailed DC microgrid has been developed in MATLAB/Simulink to analyse the response of the DERs within a DC microgrid during intentional or unintentional islanding events. The results show that these approaches cannot be used to classify and characterise between islanding and non-islanding events caused by high resistive faults for DC microgrids, as the response of the DERs are dependent on the technology and associated control systems,which influences post event analysis in distinguishing between events

Art Heals : Annual Exhibit [An Exhibit in May 2015]

Suncoast Center, Inc., Creative Arts Unlimited, Inc., Florida Craftsmen and the University of South Florida St. Petersburg have collaborated to present Art Heals, an exhibit designed to increase awareness, understanding, and prevention of the horrific trauma of sexual violence. Formerly known as the annual Survivors Speak exhibit, the theme and name of the 2015 exhibit is Art Heals. These panels appeared in the Poynter Library during a three-week period in May 2015. Contains photographs taken by Jim Schnur of the Art Heals exhibition that appeared in the Nelson Poynter Memorial Library in May 2015

Art Heals : Annual Exhibit [An Exhibit in May 2015]

Suncoast Center, Inc., Creative Arts Unlimited, Inc., Florida Craftsmen and the University of South Florida St. Petersburg have collaborated to present Art Heals, an exhibit designed to increase awareness, understanding, and prevention of the horrific trauma of sexual violence. Formerly known as the annual Survivors Speak exhibit, the theme and name of the 2015 exhibit is Art Heals. These panels appeared in the Poynter Library during a three-week period in May 2015. Contains photographs taken by Jim Schnur of the Art Heals exhibition that appeared in the Nelson Poynter Memorial Library in May 2015

Art Heals : Annual Exhibit [An Exhibit in May 2015]

Suncoast Center, Inc., Creative Arts Unlimited, Inc., Florida Craftsmen and the University of South Florida St. Petersburg have collaborated to present Art Heals, an exhibit designed to increase awareness, understanding, and prevention of the horrific trauma of sexual violence. Formerly known as the annual Survivors Speak exhibit, the theme and name of the 2015 exhibit is Art Heals. These panels appeared in the Poynter Library during a three-week period in May 2015

Art Heals : Annual Exhibit [An Exhibit in May 2015]

Suncoast Center, Inc., Creative Arts Unlimited, Inc., Florida Craftsmen and the University of South Florida St. Petersburg have collaborated to present Art Heals, an exhibit designed to increase awareness, understanding, and prevention of the horrific trauma of sexual violence. Formerly known as the annual Survivors Speak exhibit, the theme and name of the 2015 exhibit is Art Heals. These panels appeared in the Poynter Library during a three-week period in May 2015. Contains photographs taken by Jim Schnur of the Art Heals exhibition that appeared in the Nelson Poynter Memorial Library in May 2015

Art Heals : Annual Exhibit [An Exhibit in May 2015]

Suncoast Center, Inc., Creative Arts Unlimited, Inc., Florida Craftsmen and the University of South Florida St. Petersburg have collaborated to present Art Heals, an exhibit designed to increase awareness, understanding, and prevention of the horrific trauma of sexual violence. Formerly known as the annual Survivors Speak exhibit, the theme and name of the 2015 exhibit is Art Heals. These panels appeared in the Poynter Library during a three-week period in May 2015. Contains photographs taken by Jim Schnur of the Art Heals exhibition that appeared in the Nelson Poynter Memorial Library in May 2015

Art Heals : Annual Exhibit [An Exhibit in May 2015]

Suncoast Center, Inc., Creative Arts Unlimited, Inc., Florida Craftsmen and the University of South Florida St. Petersburg have collaborated to present Art Heals, an exhibit designed to increase awareness, understanding, and prevention of the horrific trauma of sexual violence. Formerly known as the annual Survivors Speak exhibit, the theme and name of the 2015 exhibit is Art Heals. These panels appeared in the Poynter Library during a three-week period in May 2015. Contains photographs taken by Jim Schnur of the Art Heals exhibition that appeared in the Nelson Poynter Memorial Library in May 2015