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GVEA BESS

Expected and Actual Performance

Dan Bishop

Golden Valley Electric Assoc

Fairbanks, AlaskaUSA

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Table of Contents

BESS Background

BESS 18 Month Availability Guarantee

BESS Hardware Issues

BESS Lessons Learned

Actual Performance

Future Uses

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BESS - BACKGROUND

GVEA - RUS CO-OP in Alaska

Typical Short on Real Spinning Reserves

Power Supply Outages Shed Customers to Stabilize System

BESS Conceived as Part of a New Intertie Project 1993

Project Delayed Due to EIS Process on Intertie 2000

Selected a Consortium of ABB and Saft

$30.3M

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BESS - BACKGROUND

Project Started October 2001

27 MW for 15 Minutes ABB Converter Technology (46 MVA)

Saft Liquid Filled Ni-Cd Technology 4 Strings (13,760 total cells)

5kV DC Link Voltage

Commercial Startup in September 2003 Begin 18 Month 98% Availability Period

Project Completed December 2003

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BESS BACKGROUND – Operating Modes

Spinning Reserve

Automatic Scheduling

AGC

Support for Scheduled Load Increases

PSS

Charging

Primary Use is Voltage Support (VAr) Converter is capable of full power circle output

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BESS – BACKGROUND - OPERATING MODES

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BESS – BACKGROUND - OPERATING MODES

Spinning Reserve Mode Critical due to nature of electrical system

Lack of “Real” Spinning Reserve due to cost of oil-fired generation

GVEA Purchases Non-Firm Energy from Anchorage Utilities We are Responsible for the Spinning Reserves if Unit(s) Trips

SCADA Loads BESS table with Spinning Reserve Obligation Operates as part of SILOS (25%, 25%, 50%)

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BESS – BACKGROUND - OPERATING MODES

Automatic Scheduling Mode For Problems Internal to the GVEA Transmission System

Monitors Generator & Remote Transmission Substation Breakers Power Flow thru Breaker, Trip Circuit Current & Breaker Status

35 1

OR SUBSTATION BREAKERSREMOTE GENERATOR

BESS

SCADA CONTROL CENTER

GATE WAY GATE WAY GATE WAY GATE WAY

AUTO SCHEDULE

MW SETPOINT TABLE

PSR

2930

12

BREAKER TRIP SIGNALS

VIA MICROWAVE

.

.

.

.

.

.

MW

FLO

W T

HRU BREAKERS

VIA M

ICRO

WAVE

FOR EACH BREAKER INPUT (30 TOTAL)

UPLOADED INTO HMI TABLE

CALCULATED MW SETPOINT

VIA FIBER

HMI

AUTO SCHEDULE

MW SETPOINT TABLE

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BESS - 18 MONTH AVAILABILITY GUARANTEE

98% Availability for 18 Months 262.8 Hours

September 19, 2003 - Start

Diode Failure(s) October 21, 2003 – BESS Offline for 70 Hours

June 2004 – Converter Maintenance

July 2004 – Two Separate PSR Board Failures

March 18, 2005 – Successful Completion Down Time = 111 Hours

99.2 % Availability

June 201210

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BESS – HARDWARE ISSUES

Diode Failures

Board Failures

Losing Air Pressure in the Cooling System

Sentry (BMS Modules)

Battery Cells

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BESS – HARDWARE ISSUES - Sentry Device

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BESS - HARDWARE ISSUES - Sentry Device

344 Sentries/ String; 1376 Total

String would Fail to Complete Sentry Logging Process

Individual Sentry Failures Turned out to be an ESD Issue

Low Voltage Communication Wire Extended over the High Voltage Side of the PCB.

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BESS – HARDWARE ISSUES - Sentry ESD Solution

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BESS – HARDWARE ISSUES – Battery Cells

December 2003; Initial Installation Transit or Other Damage – 15 Cells

Low Voltage Problems – 7 Cells Rejected

June 2004 Leaking Due to Transit Damage – 3 Cells Rejected

Severe Reversal / Electrolyte Ejection – 3 Cells Rejected

April 2005 Severe Reversal / Low Capacity – 4 Cells Rejected

2008 SOH Issue Warranty replacement of two strings with improved cells.

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BESS – LESSONS LEARNED - SPINNING RESERVES

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BESS - LESSONS LEARNED

Run Time Predictor Functionality Originally Fixed MW Values that showed Runtime (Minutes)

AGC and Load Shed Applications Needed a 15 Minute MW Value.

Charge Mode Modification – Modify Auto Start & Add Ability to Turn On/Off From Dispatch

Q (VAr)-Oscillations – 20 Hz Software Filter

RampStandard VS RampFast Transition Between Modes 4 MW/Minute VS 2500 MW/Minute

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BESS – Actual Performance

BESS Statistics 388 Events to Date (November 2003 – June 2012)

Recent Event - May 26, 2012 26-27 MW for 9 minutes, then ramped down at 4MW/minute due to a fault on the Alaska Intertie

651 MW-hrs

Availability 99.14% 9/1/2010-6/19/2012

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BESS - Actual Performance

Customer Outages avoided as of 6/19/2012

1,621,712

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BESS Performance – RESPONSE TO EVENTS/OUTAGES

BESS Event Response (November 2003 – April 2005)

Projected Performance

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BESS Performance – RESPONSE TO EVENTS/OUTAGES

BESS Event Response [MWHrs] (November 2003 – April 2005)

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BESS Performance – RESPONSE TO EVENTS/OUTAGES

BESS Event Response (January 2009 – December 2011)

Projected Performance

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BESS – Future Application

Renewable Mode GVEA is working with SAFT and ABB

Optimize for use with the Eva Creek Project

Ramp rate relief

Determine if improved batteries could reduce CT backup req’s

Rapidly responding spinning reserve The BESS response faster than conventional generation.

As Railbelt generation is upgraded to more efficient Aeroderivative units this is expected to become a more important factor in controlling UF loadshed.

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BESS – World Records

Most Powerful BESS 46 MW for 5 Minutes; Guiness World Record

34 MW for 15 Minutes

27 MW for 24 Minutes

Maximum Output of 46 MVA

Highest Voltage Battery >5 kV DC

Also a -46/+46 MVAR SVC

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Thank you!