2. Integrated DMS Applications Improve the Outage Management Process The integration of DMS applications in the OMS has proven to improve outage performance. For example, a fault location algorithm uses the as-operated electric network model, including the location of open switches, along with an electrical model of the distribution system with lengths and impedances of conductor segments, to estimate fault location. The DMS Fault Location functionality therefore uses the electrical DMS model, but ultimately improves the OMS process. The experience of Progress Energy Carolinas with the ABB Fault Location application shows a significant reduction in SAIDI over the 6 years since the application has been in operation. Similarly, a Restoration Switching Analysis application evaluates the possible isolation and restoration switching actions that can be done upon occurrence of a permanent fault. The application executes an unbalanced load flow to determine overloaded lines and low-voltage violations for each switching action, and the operator is provided with a listing of recommended switching actions. Again, the functionality utilizes the DMS model of the system, but improves the Outage Management process and reduces CAIDI and SAIDI. 3. DMS/OMS Integration Improves Coordination of Planned and Unplanned Work Distribution systems are dynamic in nature, with changes occurring on a daily basis due to both planned work and outage restoration. If a safe and efficient operation of the system is to be achieved, then it is critical to ensure that the current state of the network is continuously maintained and made available to those working on planned and unplanned work. This includes operators, dispatchers, persons responsible for switching requests and switching plans, field crews, engineering, and others who require an accurate representation of the system state. Temporary network changes such as line cuts and jumpers, phase jumpers, switch operations, protective device operations, grounding tags, safety, warning, and information tags, and temporary generators should be represented. This is easiest if a single model is used for the DMS and OMS. With DMS and OMS working with the same operational model of the distribution system, circuit analysis can be fully functional considering temporary changes. This includes circuit tracing, trouble call and outage analysis, safety interlocks, loop and parallel source detection, fault location and load flow. The result is a more comprehensive and accurate understanding of system conditions at any moment in time. 4. DMS/OMS Integration Reduces Data Maintenance Efforts Many distribution organizations maintain and make planned updates to the network model in their Geographic Information System (GIS). Since DMS and OMS both require a connectivity model of the distribution system, data maintenance processes are simplified if the DMS and OMS are operating from the same model. The result is one set of processes for managing the network model, and one process for the incremental update to the DMS/OMS model instead of two. Integrated SCADA/DMS/OMS: Increasing Distribution Operations Efficiency
Integration of SCADA and DMS/OMS
Integration of DMS/OMS with SCADA is an increasing trend. While the inclusion of SCADA ?breaker-open? operations in OMS have long been used for outage detection, recent business challenges have driven a more comprehensive integration between the two systems. Available functionality now includes the transfer of status/analog points from SCADA to the DMS/OMS; the sending of supervisory control and manual override commands from the DMS/OMS to the SCADA; an integrated user interface running on the same operator console, and integrated single sign-on for users. The benefits of integrating Scada with dmS/OmS include: ? Improved operations by close integration of DMS applications with distribution SCADA ? Increased operator efficiency with one system, eliminating the need to go to multiple systems with potentially different data ? Integrated security analysis for substation and circuit operations to check for tags in one area affecting operations in the other ? Streamlined login and authority management within one system ? One network model for OMS and DMS analysis ? Consolidated system support for DMS/OMS and Distribution SCADA ? Simplified data engineering via coordination of SCADA point and GIS data changes Integration of SCADA and DMS/OMS can be between systems of the same vendor, or between different vendors, using a protocol such as ICCP (Inter-Control Center Communications Protocol). Using systems from the same vendor typically results in increased functionality and can reduce the need for data engineering in the systems.Integrated Distribution Operations Center
figure 3 depicts the architecture for a fully integrated distribution operations center. The integrated DMS/OMS system model is initially created using a one-time data load from the GIS. Periodic updates to the DMS/OMS model is then performed using an incremental update process from the GIS. Since the DMS and OMS use the same network model, it is only necessary to have a single update process. March-April 2009 Issue I figure 2 - DMS ? Integrated SCADA/DMS/OMS Architecture 33
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