M90 Energy Storage System Large-scale PV Integration

Bruce Ebzery

10 July 2012

PV Panels and Energy Storage

2 x 340kW PV part of 1.2MW University of Queensland

(UQ) PV Installation

M90 connected to 340 kW multi-level carpark #2PV

M90

20ft shipping container 90kW / 180kWh

24 ZBMs

Installing the M90 at UQ

Inside View of M90

Installed M90 at UQ

Internal View of M90

Initial design CAD drawings

Power Tower

20kW 10kW 20kW 10kW 0kW 0kW

1. Grid only application

The system charges and discharges from and to the grid. No load connected at all times. (Ausgrid principle);

2. Grid connected with passive loads support The system charges and discharges from and to the grid and backups the loads in case of blackout. (AEST principle);

3. Renewables variability mitigation Grid oriented The system keeps a constant current set point (≠0 A) on the grid side, charging and discharging the ZBM according to renewables generation. No load connected at all times;

4. Renewables variability mitigation Grid oriented with Backup The system keeps a constant power set point (≠0 kW) on the grid side, charging and discharging the ZBM according to renewables generation. The load is supported at all times and backed up;

5. Renewables peak shifting Grid oriented The system keeps 0 A constant current set point, charging with renewables during generation times and dumping into the grid the excess power. At the selected time, the system discharges into the grid. No loads connected at all times;

6. Renewables peak shift Grid oriented with Backup / Grid virtual disconnection

The system keeps 0 kW constant power set point on the grid side, charging and discharging according to renewables generation, supporting the loads and sourcing or dumping into the grid in case of excess power needed or generated. (Newington House principle);

7. RAPS The system is connected to a generator and supports a mini-grid with loads and renewables. The generator is started and stopped accordingly to battery SoC or power requested.

M-Class Advanced Operations: Energy Storage Operating Modes

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UQ M90 and PV Output - Monday 2 July 2012

PV Power (kW) M90 Adjusted PV Power (kW)

Sunny mid-winter day in Brisbane

61.99% AC-AC efficiency

25.65 kWh delivered by M90

41.37 kWh consumed by M90

First Day of Operation

340kW PV 90kW / 180kWh M90

Second Day of Operation

266.7283 kWh In

158.82 kWh Out

59.54373 % Efficiency

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UQ PV and M90 Output - Tuesday 3 July 2012

PV Power (kW) M90 Adjusted PV Power (kW)

Sunny mid-winter day in Brisbane

59.54% AC-AC efficiency

158.82 kWh delivered by M90

266.73 kWh consumed by M90

340kW PV 90kW / 180kWh M90

First Four Days of Operation

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UQ PV and M90 Output – 2 to 5 July 2012

PV Power (kW) M90 Adjusted PV Power (kW)

Sunny mid-winter days in Brisbane

Short period of cloud cover

ESS draws from grid to charge

340kW PV 90kW / 180kWh M90

Eighth Day of Operation

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UQ PV and M90 Output - Monday 9 July 2012

PV Power (kW) M90 Adjusted PV Power (kW)

59.93% AC-AC efficiency

Overcast mid-winter day in

Brisbane

153.45 kWh delivered by M90

256.04 kWh consumed by M90

340kW PV 90kW / 180kWh M90

More Operation

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Friday, 6 July 2012 Saturday, 7 July 2012 Sunday, 8 July 2012 Monday, 9 July 2012

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UQ PV and M90 Outputs - 6 to 9 July 2012

PV Power (kW) M90 Adjusted PV Power (kW)

Mostly fine/overcast mid-winter days in Brisbane

ESS draws from grid to charge

340kW PV 90kW / 180kWh M90

Smoother Output Curve

What is a ZBM?

ZBM Charge/Discharge Graph

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Smaller-Scale PV-Integrated Energy Storage

Energy Safe Victoria Trial 3-5kW PV panel

2 x 5kW / 10kWh ZBM 5kW / 10kWh LA batteries

7kVA diesel generator Average Australian household load