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Off-The-Shelf Static Excitation System:A Cost-Effective Alternative for
Hydrogeneration PlantsEnrique Morquecho – Humberto Camarena
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Overview
Introduction
Problem Statement
System Requirements
Engineering Development
Design Revision
Future Work
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Introduction
Holliday’s Bridge Hydroelectric Plant, South Carolina.
One (1) Motor-Generator Set used as the primary excitation system for two (2) generators.
MG Set Serviced on June 2017.Commutator was Turn-And-Undercut on site.
Commutator was in such a bad condition that it had to be serviced a year after.
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Holliday’s Bridge
Existing MG Set
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Problem Statement
Replacing the Commutator was non cost-effective.
MG Sets suffer the disadvantages of every rotating apparatus.
Static Excitation Systems are too expensive for small generators.
Local support & OEM service is expensive and rarely available.
All of the designs and parts are proprietary.
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System Requirements
System Cost below $80,000 USD.
2300V Plant Bus.
125V 110A Excitation Output.
Power Factor Controller.
User friendly interface.
Use existing sensors (CTs and PTs).
Protection Relay.
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System Requirements
Existing MG Set
Units Powered by Original MG Set
Units with Proprietary Static Exciter
Units with Off-The-Shelf Static Exciter
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Static Excitation System
Engineering Development
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Engineering Development
Step-down transformer 2400 VAC – 230 VAC
125 VDC 110 A DC Drive
Energy Isolation Capabilities
Push-Button Interface
Power Factor Controller
Protection Relay:Under-excitation (40)
Time Overcurrent (51VC)
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Static Excitation System
Design Revision
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Design Revision
Step-down transformer outside the static excitation system.
Energy isolation of system on the 230 VAC side instead of the 2300 VAC.
DC drive with programming and I/O capabilities.
Remote add on control box.
Addition of metering transformers.
2 weeks of installation and commissioning .
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Static Excitation System
Future Work
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System Development Roadmap
Upgrade to HMI control and display of generator information.
Use a more standard DC drive with shorter lead time and easy swap.
Add PLC to integrate the full generator operation and DAQ.Mechanical Control - Blade / Gate
Vibration, Temperature & Water Level Monitoring
Auto synchronization optional
Remote control and monitoringAlarms and events (text/email messages)
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Thank You!Off-The-Shelf Static Excitation System:
A Cost-Effective Alternative for Hydrogeneration Plants
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