Innovation in Global Power - Parsons Brinckerhoff

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Distributing Power to Users http://www.pbworld.com/news_events/publications/network/ Commercially Available Software We were interested in learning about the usage of commercially available power system analysis packages we were aware of for distribution network planning. These and the related Web sites are as follows: • DINIS (Distribution Network Information System) by ICL: http://www.dinis.com/ • Interactive Power Systems Analysis (IPSA) by TNEI: http://www.ipsa-power.com/ • CYMDIST (CYME International Inc., USA-Canada: http://www.cyme.com/ • ERACS (ERA Technology Ltd, UK): http://www.era.co.uk/Services/eracs.asp • Power Factory (DIgSILENT GmbH, Germany): http://www.digsilent.de/ • SynerGEE Electric: http://www.advantica.biz/default.aspx?page=323 • SINCAL (Siemens, USA): http://www.siemens.com/power-technologies/software • DPLAN Distribution Planning • ETAP Power Station (Operation Technologies Inc, USA): http://www.etap.com/ • NEPLAN (BCP, Switzerland): http://www.neplan.ch/ An assessment of the technical features of each software is not presented in this article; however, readers seeking more information may contact the authors. Conclusions Fifteen DNOs in Europe, Africa, Middle East, New Zealand and Australia responded to the survey. We had no response from USA. We noted details of the various distribution network structures, including voltage levels and network design, and took them into consideration when reviewing the results. The main conclusions reached are as follows: 1. In the UK, for example, the majority of DNOs use one or more of PSS/E, IPSA and DINIS, although more products are starting to be used as the international market in system analysis software develops. IPSA was developed in the UK by UMIST (now part of the University of Manchester) with contributions from several of the UK DNOs. 2. Many of the DNOs outside of the UK use SINCAL. 3. The majority of the respondents use the same software for 11 kV and 33 kV distribution networks. 4. Many of the DNOs do not use any software package for their low voltage planning studies. Those who do use either DINIS, CYMDIST or WinDebut. 5. For power quality studies, the DNOs either use the same software packages for load flow and fault level calculations, are not doing these studies, or currently outsource these studies. 6. Many of the DNOs have a GIS system, but only one imports network data from it. The summary of responses to a question regarding what software packages are used for several 33 kV planning studies is shown in Table 1. It is expected that those software packages that incorporate the modeling of embedded generation with comprehensive analytical features, reasonable cost, adequate customer support and ease of use will become prime analytical tools that can be considered suitable for the distribution networks of the future. Table 1: Consolidation of Responses to Question 1(a): What software package (including version) do you use for the following 33 kV planning studies? PB Network #68 / August 2008 76
http://www.pbworld.com/news_events/publications/network/ Distributing Power to Users Improving 11 kV Network Performance in Al Ain By Aleksandar Nikolic, Al Ain, Abu Dhabi, 971-506614170, nikolicA@pbworld.com This 11 kV OHL network performance improvement project is a pioneering one, and it is proving to be very demanding. It introduces the most advanced OHL equipment for the first time in the Abu Dhabi Emirate. Acronyms/Abbreviations AADC: Al Ain Distribution Company OHL: Overhead line Al Ain’s 11 kV distribution network is spread over 11,275 km 2 (4,350 square miles) and divided in four regions: City, Northern, Western and Southern. The 11kV overhead line (OHL) feeders are present in all regions and distributed mainly in desert areas, providing power to remote farms and water wells. Some of the OHL have mixed loads, however, particularly within housing or industrial areas. The 11 kV OHL network was subject to frequent power supply interruptions, low power factors and unacceptable voltage drops. Al Ain Distribution Company (AADC) decided to improve network performance and network reliability in order to provide consistent customer power supply and to maintain acceptable limits of voltage drops and power factors. The project initiator and coordinator, AADC Operation and Maintenance (O&M) department, decided to introduce the most advanced 11 kV OHL equipment. PB was awarded the consultancy, which covers study, design, tendering, project management and warranty services. The network performance improvement was divided into the three following projects related to the different network parameters and OHL equipment: • Performance. 11 kV pole mounted autoreclosers were introduced for the network performance indices improvement, such as system average interruption frequency index (SAIFI) and system average interruption duration index (SAIDI). PB’s scope of work for this project includes tendering, autorecloser location pinpointing including all necessary data collection and calculations, project management and site supervision. • Power factor. 11 kV pole mounted capacitor banks were introduced for the power factor improvement and loss reduction. PB’s scope of work for this project includes site survey and data collection, study, design and tender preparation. • Voltage profile. 11 kV pole mounted voltage regulators were introduced for the voltage profile improvement. PB’s scope of work for this project includes tendering, project management and site supervision. Using Some Latest Technology Developments The OHL equipment, being exposed to different and often severe weather conditions, is always subject to improvement. The weather conditions are particularly severe in desert areas, where more weather-resistant equipment requiring as little maintenance as possible is needed. We evaluated a range of solutions, but taking these severe conditions and our client’s objectives into account, we recommended that some of the latest technology developments be introduced. • Autoreclosers. Bidders offered more than seven different manufacturers. After the detailed technical evaluation, the autoreclosers with the higher fault current interruption rating were approved. These had provided more that ten thousand maintenance free operations, and they included the latest vacuum switch technology with dual magnetic actuator mechanisms, housed in solid insulation. At the same time, more advanced control units with flexible communication protocols were introduced to provide future autorecloser integration in AADC’s remote control system. • Voltage regulators. The main technology development is related to the voltage regulator tap changer and control unit. The approved voltage regulators are equipped with tap changer capable to perform 32-step operations within 15 seconds, providing fast response to voltage fluctuation. Control units are provided with tap changer contact duty cycle monitoring facility as well as flexible communication protocols for remote control and supervision. 77 PB Network #68 / August 2008
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