EPRI Smart Grid

Author: Matt Wakefield, Electric Power Research Institute (EPRI), USA

To convey meaningful case study results, a standard case study format was created to enable a consistent document outline while still allowing for some variation to capture the unique characteristics of each demonstration.
Each of the case studies completed to date provided an overview, background information, approach/methodology, results, lessons learned, and finally key recommendations.

Some case studies also listed some unresolved questions that were uncovered in the demonstration, thus providing a guideline for continued study.
The thirteen case studies in the report provide an overview of a range of activities from ten collaborative members. The complete case studies are available and the full content is included in the 2012 reference guide update. You will find a summary of a few of these case studies in the following pages.

This update contains a condensed summary of each case study.

A Smart Grid Reference Guide to Integrating Distributed Energy Resources
The research from this initiative continues to provide an abundance of information. In 2012, EPRI released A Smart Grid Reference Guide to Integrating Distributed Energy Resources: 2012 Version (EPRI report 1025763).
This information was organized with an updated index and cross references. Content will continue to be added to this reference guide with updates in 2013 and 2014 to capture the ongoing flow of new research results throughout the duration of the project.

Issue Based Research - Extending Collaboration across the Demonstrations
All utilities in the Smart Grid Demonstration Initiative are Collaborators and fund the research performed across the Host Site demonstration projects.

All utility Collaborators have the opportunity to propose a Host Site project with research objectives that are aligned with the overall goals of EPRI’s initiative. Research performed by EPRI is primarily conducted for Host Site projects; Non-Host Sites also have the opportunity to have targeted research performed that meets at least one of the research goals in the form of “mini-demos.”

Research results are shared with all the Collaborators (Figure1).

Non-Host-Site members’ benefit from the knowledge gained without the cost of deploying capital intensive projects, while Host-Sites benefit from research performed specifically on their projects. All of the collaborators have committed to sharing high-level results with the public to help advance smart grid efforts in the industry.

The matrix in Figure 2 identifies high-level technologies and applications of each project that are aligned with the initiative’s goals. No single project can evaluate every research scenario, but by collaborating across multiple projects, the research lessons are enhanced greatly beyond what each project could do individually.

Consolidated Edison
Using distributed energy resources to achieve greater reliability at the Jamaica substation may be possible for about 2/3 the cost of adding additional capacity

Con Edison Case Study on Assessment of Achieving Increased Reliability with Distributed Energy Resources
Con Edison undertook an investigation of whether distributed energy resources, including distributed generation, storage and demand response load reductions, could help achieve greater reliability for a network served by a specific substation in New York City. The project was a first-level screening to determine the feasibility, costs, and benefits of using distributed energy resources as an alternative to conventional transmission and distribution upgrades over a 10-year period.

The Jamaica network, which feeds a portion of the Queens area, is the network targeted in the study. (See map in Figure 3). This part of the system is under consideration for reliability improvements because of the perceived high costs associated with extended outages in the area.

The Jamaica station is designed for an N-1 (N minus one) contingency. N-1 means that in the event of the loss of the single largest element, the substation would still be able to handle the load.
Upgrading the Jamaica substation from N-1 to N-2 would enable the substation to carry the load with the loss of two transformers.


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