International White Book on DER Protection : Review and Testing Procedures

This white book provides an insight into the issues surrounding the impact of increasing levels of DER on the generator and network protection and the resulting necessary improvements in protection testing practices. Particular focus is placed on ever increasing inverter-interfaced DER installations and the challenges of utility network integration. This white book should also serve as a starting point for specifying DER protection testing requirements and procedures. A comprehensive review of international DER protection practices, standards and recommendations is presented. This is accompanied by the identifi cation of the main performance challenges related to these protection schemes under varied network operational conditions and the nature of DER generator and interface technologies. Emphasis is placed on the importance of dynamic testing that can only be delivered through laboratory-based platforms such as real-time simulators, integrated substation automation infrastructure and fl exible, inverter-equipped testing microgrids. To this end, the combination of fl exible network operation and new DER technologies underlines the importance of utilising the laboratory testing facilities available within the DERlab Network of Excellence. This not only informs the shaping of new protection testing and network integration practices by end users but also enables the process of de-risking new DER protection technologies. In order to support the issues discussed in the white paper, a comparative case study between UK and German DER protection and scheme testing practices is presented. This also highlights the level of complexity associated with standardisation and approval mechanisms adopted by different countries

A path towards low-cost, high-accuracy orbital object monitoring

In an increasingly crowded space environment, precise predictions of space object trajectories are of paramount importance in order to avoid collisions and unnecessary evasive manoeuvres. Laser-optical range measurements are a promising approach to attain the high quality input data required for good predictions. However, while laser ranging to space debris objects is possible and has been demonstrated by several observatories, the technique requires expensive, high-power lasers and large aperture telescopes, to detect the faint diffuse reflections from the surface of the targets. Therefore, we propose to routinely equip satellites, rocket bodies and potential mission related debris with small laser retroreflectors. With these, precise position measurements can be obtained much more easily, not only during the operational phase, but also after the mission. Such equipment could possibly be mandated by regulatory bodies like number plates in road vehicles. However, if the additional impact and cost of the technology is small enough, satellite owners and operators may even choose to include retroreflectors in their designs voluntarily and for their own benefit. This seems especially likely in the case of large constellations, in which a precise tracking of defunct satellites is of great importance to protect the other objects in the constellation. In this contribution we will present recent developments at DLR Stuttgart to facilitate a more wide-spread introduction of this technology. The miniSLR system is a small, fully automated laser ranging ground station that can be used to track and range to objects equipped with retroreflectors. It is completely integrated in a box of 120 cm x 180 cm footprint and can be transported to a remote observation site after full integration and testing at the home institution. If produced in a small series, it may become the backbone of a global low-cost satellite laser ranging network for space traffic monitoring services. Furthermore, new types of retroreflectors are currently under development, which may allow a unique identification of space objects using laser ranging. In combination, these technologies can contribute to a more controlled and thus safer space environment

The Grizzly, March 19, 1990

Long Awaited Art Minor Develops • Debate Provokes Thought • Fire: Alarming! • Letters: Reminiscent of Nostalgia?; Ex-Editors Thanked • Global Changes In U.N. • Liberal Studies For Freshmen • New Exhibit Opens: Cohen, Zucker at Berman Art Museum • Bear Pack Set For Outdoor Season • Bears: New and Better • Sorry, No Cigar • UC Tennis • Women\u27s Lax Triumph • Video Review • Green Pledgehttps://digitalcommons.ursinus.edu/grizzlynews/1254/thumbnail.jp

The Grizzly, November 3, 1989

Wismer Woes • Curriculum Changes Affect all Students at U.C. • Letters: A Voice for Love ; Coaching Cowardess • Alcohol Awareness • Club Sails Smoothly • For Nature\u27s Nurture • Bears Struggle with Division I • Honors Galore • X-C Teams Look to MAC\u27s • Hoopla!https://digitalcommons.ursinus.edu/grizzlynews/1245/thumbnail.jp

The Grizzly, March 26, 1990

Wismer Plans Alternatives • Reaction to Idaho Law • 101 Blaze Update • Letters: Cleaning Service Working?; Fix, Please! • Broaden our Horizons • Sex and Religion • Doughty Discusses Seminar • Time is Now for Men\u27s Lacrosse • Bears Win First • Track Team Beats the Cold • Hackers No More • Tennis Sweep • Bears Roll • Comedy Plays at Ritter • This Week\u27s Video Reviews • Fun With Jell-Ohttps://digitalcommons.ursinus.edu/grizzlynews/1255/thumbnail.jp

The Grizzly, February 2, 1990

Bio-gate Break-in Has Faculty Bugged • Wismer Transforms: Are We Impressed?! • Letter: Find Something New, GDI! • Townies Lay Reimert Siege • Updike Displayed • Meyer Enjoys U.C. • Ursinus Aquabears Sink E-Town and WMC • Runners Watch Their Step • Hoops Rebound! • Women on Track • Coach Lambdin Taking Charge • In U.C. We Trust • Ursinus Going Smoke Free? • Faculty Recital • Dean Lucas Excites Academicshttps://digitalcommons.ursinus.edu/grizzlynews/1250/thumbnail.jp

The Grizzly, October 13, 1989

Berman Opening Draws Near • Sculptor Chadwick Visits UC • Frats Angered • Letters: Grizzly, Get on the Ball!; Shape up!; Dump Starkist! • Michener Opens Museum • Swarthmore, Hopkins Defeated • V-Ball Wins • Hockey Squad Beats Nationally Ranked Teams • 1989 Candidates for Homecoming Queen • Soccer Looks to Future • Wagner Runs Wild • Athletes of the Week • Control Pledging Power Abuses • The Wismer Beastieshttps://digitalcommons.ursinus.edu/grizzlynews/1243/thumbnail.jp

The Grizzly, February 16, 1990

UC Fraternity Pledging: A New Era Begins • First Year Conflict and Creativity • Letter: Miffed Mother Says • Dando Joins Board of Directors • Scotland Scholarship Available • Track Tragedy • Hoops Split • Swimmers Look To MAC\u27s • Track Team Tops • Aquabears Splash Supreme • A.O.T.W • Trump: The Article • Monsters: Puppets\u27 Best • UC Hosts Championship • Errors To Be Performed • Ursinus Dryers Are All Wet • Organ Recitalhttps://digitalcommons.ursinus.edu/grizzlynews/1252/thumbnail.jp

The Grizzly, February 9, 1990

Students Grapple With Rising Costs • USEAC Plants Seeds for First Ursinus Earth Day • Letter: Cynosure Cynic • Michener Bids Campus Adieu • The Trojans are Coming • Get your Act in Gear • Feb 14: A Woman\u27s Holiday? • UC Aquabears Squash Susquehanna • Susquehanna Drowned • Hoopsters Split Again • Making Tracks • Wismer Looking Gamely • Stop The Sex Wars • Grapplers Rebound With Big Victory • Gymnasts Prepare for Nationals • Athletes of the Week • Countdownhttps://digitalcommons.ursinus.edu/grizzlynews/1251/thumbnail.jp