# Presentation: 904241

## EIPP Data Management Task Team Architecture

- Erich W. Gunther
- EnerNex Corporation
- erich@enernex.com

## Phasor Measurement Units

**Notes:**
All real-time data acquisition starts here - with Phasor Measurement Unit’s – PMU’s – the heart of the matter.  They don’t look like much – but despite their humble appearance, these little boxes can and do produce volumes of data (trust me ).  They constantly measure key electrical states, such as phase angles and frequency, at speeds of up to 120 samples per second.  TVA’s Super PDC works with data directly from these units or from their parent concentrators.  The protocol’s implemented by the TVA Super PDC allow it the flexibility to work with most all PMU’s.

## Existing Architecture

## Slide 4

## Improving the Architecture

- Transition from a research project to a system capable of supporting mission critical applications
- Robust, Reliable - Fault Tolerant
- Scaleable
- Secure and Manageable
- Eliminate dependence on specific underlying implementation technologies to lessen impact of technology change
- Meet the requirements identified in the DOE Report to Congress Section 1839, EPA2005 “Steps to Establishing a Real-time Monitoring System For Transmission Grid Owners and Operators”, Feb 2006.

## IntelliGrid Requirements and Architecture Development Process

## System Requirements

- Reliable and Fault Tolerant
- No single point of failure
- Apply lessons learned from other industries
- Scalable
- Communications links can be added without impacting overall design
- Applications can discover new data sources
- Timeliness of Data Delivery
- Application requirements must be well known
- < 200 ms for some apps, 10 s for others, historical
- System Administration and Security

## EPG’s RTDMS Application

**Notes:**
The Electric Power Group (or EPG) has developed a real-time phasor data monitoring application called the Real Time Dynamics Monitoring System (or RTDMS) that directly connects with TVA’s Super PDC.  This application presents phasor data for operations use in a logical fashion.  There are two ways that this program can access real-time data:  the first uses data directly acquired from the Super PDC’s streaming real-time data output – this option produces the fastest refresh rates but requires the end-user to have an onsite real-time data feed and locally installed server software.  The other data access option works via an SSL connection using an EPG web service hosted here at TVA – this option is not as fast, but is much easier to set up and get going quickly.   Currently displayed is a snapshot of the RTDMS frequency response screen <advance> here’s the path dynamics screen <advance> here is the relative angles and voltage magnitudes screen <advance> and here’s path flow showing megawatts... <if time permits, switch to live demo> There are other screens, but let me try to switch to the live system

## Standardized Interfaces at Well Defined Points of Interoperability

- Un-aggregated real-time phasor data stream input
- Aggregated real-time phasor data stream input
- Aggregated real-time phasor data stream output
- Historical database query / response, publish / subscribe interface
- Web based application interfaces

## Proposed Architecture

## Distributed Data Repository

## Organizational Entity Structure

## Component Actor Interfaces

## Message Architecture

- Message Brokers
- Publish / Subscribe
- Topic Trees
- Separation of data streams from the metadata that describes them
- Support browsing, data source selection

## Summary

- The EIPP DMTT has:
- Evaluated relevant architectures and has proposed a architecture that will support data transfer, synchronization, references and archiving
- Evaluated the known requirements for data management and handling.
- Identified several key system elements and interfaces
- aggregated real-time phasor data stream input
- un-aggregated real-time phasor data stream input
- aggregated real-time phasor data stream output
- historical database query / response, publish / subscribe interface
- web based application interfaces
- Recommended a reference architecture and also introduced the concept of Topic Trees to manage data and metadata.
- The system design utilizes well defined interfaces based upon industry standards and utilizes commercially available technology.
- The group still has significant work to complete within the EIPP but is well on its way to establishing a solid model for the other EIPP working groups