CASE STUDY:

IMPROVING STARTUPRELIABILITY PAYS
DIVIDENDS FOR MYSTICGENERATING STATION.

TOMONI®
O&M Optimization
Flexible Operation
GT Digital Flame Detection
PLANT DETAILS• Mystic Generating Station• Owned by Exelon Generation• Charlestown, Massachusetts,U.S.
EQUIPMENT NOTES• 1600 MW Plant with Two
Combined Cycle Power Blocks• TOMONI Solution Installed:
2016

CHALLENGE
Exelon Generation wanted to improve starting reliability at its Mystic Generating Station. Originally baseloaded when it
entered service in 2003, the power station now experiences many more start/stop cycles. When in baseload operation,
startup failures had not been a significant issue at the plant, but the transition to more frequent startups, sometimes ona daily basis, had resulted in a decrease in startup reliability.
Reliable startups are critical to smoothly dispatching power plants in today’s competitive power generation environment.
Startup delays in power plant operation can have a negative financial impact on the owner’s bottom line, in some cases
more than $100,000 per incident.

SOLUTIONRESULT

Mitsubishi Power reviewed the situation
with Exelon and determined the best
method to improve startup reliability
was to apply the TOMONI GT Digital Flame Detection
Solution. A software-based flame detection system which
operates in parallel with the physical flame detectors,
it allows the faster of either system to indicate successful
ignition. The digital solution utilizes a controls packageof software and relay logic modifications to detect healthy
ignition. This allows successful startups even if there areinstrumentation issues with the flame detectors.

A Mitsubishi Power team installed and successfully
tested the TOMONI digital solution on all four gas turbines
at Mystic Generating Station during a planned outage
period. The year prior to implementation the siteexperienced seven failed starts that were attributed tothe flame detection instrumentation. The year following
implementation, the site had 337 starts with zero startup
trips due to the ignition detection system.

Before this solution was used at Mystic, it was provenby verification testing at the Mitsubishi Power T-Point
demonstration plant in Japan and validated by fleetwide
data from operating units using Mitsubishi Power remotestartup monitoring.

FLEXIBLE
O&M
OPTIMIZATIONOPERATIONSSOLUTIONSPERFORMANCEIMPROVEMENTIMPROVEMENTSOLUTIONSFLEXIBLEOPERATIONSOPERATIONSSOLUTIONSDATAFOUNDATIONFOUNDATION& ENABLERS& ENABLERS“The startup success rate at Mystic improved immediately
when we installed the TOMONI solution. Reliable startups
are critical to the dispatchability of our plant. You can’t
compete effectively when your ability to be online, whenneeded, is questioned. With this digital-based solution,
we’ve experienced a substantial improvement in startup
reliability, which improves our profitability.”
Brian Pettenati
Plant Manager at Mystic Generating Station

DATA FOUNDATION& ENABLERS

O&M
OPTIMIZATIONPERFORMANCEPERFORMANCEIMPROVEMENTIMPROVEMENTSOLUTIONSFLEXIBLEFLEXIBLE
OPERATIONSOPERATIONSSOLUTIONS TOMONI® is a suite of intelligent solutions that accelerates decarbonization with power plant design, O&M and system knowledge, together withstrong customer and partner collaborations. TOMONI leverages advanced controls, artificial intelligence and machine learning with multi-layered
cybersecurity to make energy systems smarter, more profitable and ultimately more autonomous on the road to a sustainable future.

O&MOPTIMIZATION© Mitsubishi Heavy Industries, Ltd. All rights reserved. TOMONI® is a registered trademark of Mitsubishi Heavy Industries, Ltd.
Mitsubishi Power is a power solutions brand of Mitsubishi Heavy Industries.

Data Foundation & Enablers
O&M Optimization
Performance Improvement
Flexible Operations
METP-11DS04E2-A