XCEL ENERGY PROJECT UPDATESMiche l l e L im

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PEÑA STATION/PANASONIC PILOT

• 1MW/2MWh Younicos Lithium-Ion Battery– 4 x Y-cubes at 250 kW

• 1.3MW Carport PV @ 13.2 kV• 200kW Panasonic rooftop PV• Microgrid Switchgear and Relays

– SEL-751 Relay– S&C 13.8 kV Islanding Switch

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USE CASES

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• Microgrid/Islanding of Panasonic building• Peak Demand Reduction

– System Peak Demand Reduction (AutoGrid)– Feeder Peak Demand Reduction

• Voltage Regulation• PV smoothing/Ramp Rate Limiting• Energy Arbitrage• Frequency Response

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RAMP RATE ON 8/21/17 ECLIPSE

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10:30:00 11:42:00 12:54:00 14:06:00 15:18:00 16:30:00

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Eclipse 08/21/2017 Panasonic Project

PV Output

Battery Output

PV Max Ramp Rate ~ 48 kW/s

PV Max Ramp Rate ~4kW/s

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PV “SMOOTHED” OUTPUT 8/21/17

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13:04:48 13:12:00 13:19:12 13:26:24 13:33:36 13:40:48 13:48:00

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08/21/2017 "Smoothed" Ramp Rate

PV Output

PV+BESS Output

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STAPLETON NEIGHBOURHOOD

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• Stapleton feeder has ~18.5% PV penetration• Utility-Sited Systems:

– System Provider: Northern Reliability– Six Li-Ion battery energy storage systems– Sited along the feeder at two different phases

• Behind-the-Meter Systems:– System Provider: Sunverge– Six Li-Ion battery energy storage systems– Sited in a customer’s home

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STAPLETON UTILITY SITED OVERVIEW

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• Northern Reliability Modular Units:– 2 x 18 kW/69 kWh– 2 x 36 kW/138 kWh– 2 x 54 kW/207 kWh

• Use Cases:– Peak Demand Reduction– Voltage Regulation– Solar Time Shifting– Energy Arbitrage

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STAPLETON BEHIND-THE-METER OVERVIEW

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• Sunverge SIS units– 6 x 6 kW/15.5 kWh

• Use Cases:– Providing Residential

Backup Power– Peak Demand Reduction– Solar Time Shifting– Volt-Watt Operation

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CHARGE/DISCHARGE CYCLE FOR TESTING VARIOUS METRICS

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• A charge/discharge test with a fixed duty cycle test can be used to find:

– Efficiency of the system

𝜂𝜂 =𝐸𝐸𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑 − 𝐸𝐸𝑑𝑑𝑎𝑎𝑎𝑎−𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝐸𝐸𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑 − 𝐸𝐸𝑑𝑑𝑎𝑎𝑎𝑎−𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑

– Charge/discharge capacity compared to the rated energy of system

– Rated continuous charge and discharge power compared to the rated power of the system

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TENTATIVE RESULTSEFFICIENCY (SEPT – OCT TESTING)

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STS & SPDR Net Zero VRO & SPDR Bill Management

Effic

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y (%

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Operations

Efficiency of SIS Units with Different Operations

STS – Solar Time Shifting, SPDR – System Peak Demand Reduction, VRO – Voltage Regulation, Net Zero – Set the Home to have Net Zero

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BESS POWER OUTPUT WITH DIFFERING EFFICIENCY

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-6000

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BESS Power Output

Lower efficiency since BESS is performing an intensive operation

High efficiency since the BESS is not performing any operation

SAMPLE TESTSOLAR TIME SHIFTING

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Solar PV Production(Battery-PV) Charge battery Discharge

battery

PRELIMINARY TEST RESULTTIME-OF-USE BILL MANAGAMENT

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Peak period

Site meter demand with battery (load convention)Site meter demand without battery (load convention)

Charge battery

Begin discharging battery

PEAK DEMAND REDUCTION TEST SAMPLE

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6:57 7:26 7:55 8:24 8:52 9:21 9:50

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Site meter (demand)Battery output

Battery discharges to maintain load at net zero demand

TEST SAMPLE RESULTS

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Test Results for BTM Unit

Site PV

Set Site Meter to

0 WCharge from

Grid

Set Site Meter to 500 W PV Charging

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Questions

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YOUNICOS ENERGY STORAGE PARAMETERS

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Description ValueRated Apparent Power 1,000 kVA

Rated Real Power 1,000 kWRated Energy 2,100 kWh

Available Energy 1,690 kWhRound-Trip Efficiency 85.5 %

Voltage Range 432-528 VRated Continuous AC

Current1,200 A

Operating Temp. Range -10°C - 45°CPhysical Dimension 42’ x 10’

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NRI ENERGY STORAGE PARAMETERS

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Description 18 kW System 36 kW System 54 kW SystemRated Apparent

Power 18 kVA 36 kVA 54 kVA

Rated Real Power 18 kW 36 kW 54 kWRated Energy 69 kWh 138 kWh 207 kWhRound-TripEfficiency N/A

Voltage Range 172 – 264 VRated Continuous

AC Current 94 A 187 A 281 A

Operating Temp. Range -30°C -50°C

PhysicalDimension

56” x 52.75” x 53”

112” x 52.75” x 53”

159” x 52.75” 53”

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SUNVERGE SIS UNIT

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SUNVERGE ENERGY STORAGE PARAMETERS

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Description ValueRated Apparent Power 6 kVA

Rated Real Power 6 kWRated Energy 15.5 kWh

Available Energy 11.64 kWhRound-Trip Efficiency 92.5 %

Voltage Range 233 – 247 VRated Continuous AC Current 25 A

Operating Temp. Range -20°C - 50°CPhysical Dimension 76” x 34” x 14 “

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