Residential Battery Storage Systems. Design support experience using Hardware in the Loop Opal-RT

Andres SalazarSonnen Inc, R&D Atlanta GA

Company Overview

sonnenEuropean Market Leader for intelligent Li-Ion-Storage systems

» Manufacturer of intelligent Li-Ion-Storage Systems for both residential and commercial segment

» HQ in Germany, Daughter Company in USA (HQ in Los Angeles, CA, R&D in Atlanta, GA)

» Pioneer with market experience since 2010 and market presence in Europe, USA and Australia

» 10.000 systems sold

» > 100% annual growth

» 150 employees in EU and USA

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Product Overview

5

eco - white

eco – white incl. extension cabinet

Cutting Edge Design Residential Solution Becomes Part of Home

sonnenBatterie eco

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» Fully integrated, AC-coupled system and easy to install (“Plug & Play”)

» Optimized self-consumption – Weather forecast, self-learning algorithm

» Comfortable and easy control via App, Internet or Touch-Display

» Broad portfolio for private households and small businesses

» High software intelligence

• Intelligent „Peak Shaving“

• Demand Side Management

• VPP Aggregation through remote control

Remote control via mobile app, tablet or laptop

Fully integrated Storage System

» Complete operable AC-system

» Perfectly selected and synchronized components including Energy Management

» Intrinsically safe( Non thermal runaway) and reliable Lithium-Iron-Phosphate Battery (SONY) with unique Warranty of 10,000 cycles

» Easy and cheap to install

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Battery

Power Electronic / Inverter

Touch Display and Energy ManagerHigh Level Controller

sonnenBatterie eco 8

Cabinet

Residential Product Portfolio Europe/Australia

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» Basic cabinet with 2 kWh (eco 8.0) - can be wall-mounted

» Extension cabinet for modular capacity up to 16 kWh (in 2 kWh steps) - Adding battery capacity at any time

» 10,000 cycles @ 100% DOD

» 10 year warranty

Residential Product Portfolio USA

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» Basic cabinet with 4 kWh (eco 4.0)

» Extension cabinet for modular capacity up to 16 kWh - Adding battery capacity at any time

» Back-Up + Off-Grid functionality included

» 10,000 cycles @ 100% DOD

» 10 year Warranty

sonnen is a multipile solution providerAbility to adress several use cases

Energy Management Hub for every Home

» Solar day & night

» Integration of Power and Heat

» Demand-Side-Management and Smart Home

» Tariff optimization (Time-of-Use Shifting)

» Back-Up-Power

» Data Monitoring and Analytics

Demand Charge Reduction

» Intelligent Peak Shaving

» Reduce commercial customers power bill by 20-50%

Grid Services and Energy Market Integration

» Remote Control and VPP aggregation

» Energy Trading / Arbitrage

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basic overview

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basic overview II

challenges – hardware - software

- Inverter Dynamic operation In Nano Grid operation

- Optimal Charge-Discharge

- Health monitoring of the batteries

- Software Releases Test

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Nano-grid Operation

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-Sources

-Scenarios

Real – Time Results

Power Electronics Model using eHS

Example: AC Start-Up simulator

Ts: 295 ns

Optimal Charge-Discharge and Software testing

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PV Inverter

Inverter

LiFePO4Batteries

Load Panel

ATSM

M

Internal sonnen computer(control)

Modbus Protocol

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ATS

Modbus RTUModbus TCP

Battery ModelPV ModelLow Frequency Inverter Model (on eHS)Modbus Communication

Ts = 225ns

Python scripts for automated testing

Battery Health Monitoring

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Battery Model (on eHS)PV ModelHigh Frequency Inverter Model(on eHS)

Battery Aging Diagnostic Through Internal Impedance Measurement

Summary

- Opal systems in specific OP4510 is allowing sonnen R&D group to develop :

- Analysis of the stability in Bi-directional inverter control topologies while connected to nano-grids.

- Testing the implementation of optimal battery charging and discharging under multiple scenarios involving real weather and demand data.

- Validation and testing of new software releases in an accelerated and automated way without the need of external hardware.

- Implementation of novel algorithms for measuring the battery impedance while using this information for aging diagnostic of the batteries.

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references

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Ginart, A. Salazar and R. Liou, "Transformerless Bidirectional Inverter for Residential Battery Storage Systems," 2016 IEEE Green Technologies Conference (GreenTech), Kansas City, MO, 2016, pp. 18-23.

Ginart, A. Salazar, D. Patel, J. Roach, C. Restrepo and H. Schweizer, "Air Conditioning (A/C) Startup Simulator for Evaluating NanogridOperation," 2016 IEEE Green Technologies Conference (GreenTech), Kansas City, MO, 2016, pp. 124-129.

Ginart, R. Riley, B. Hardman and M. Ernst, "Closed-Forms Solution for Simplified PV Modeling and Voltage Evaluation Including Irradiation and Temperature Dependence," 2013 IEEE Green Technologies Conference (GreenTech), Denver, CO, 2013, pp. 105-112.doi: 10.1109/GreenTech.2013.24

D. I. Stroe, M. Swierczynski, A. I. Stan, V. Knap, R. Teodorescu and S. J. Andreasen, "Diagnosis of lithium-ion batteries state-of-health based on electrochemical impedance spectroscopy technique," 2014 IEEE Energy Conversion Congress and Exposition (ECCE), Pittsburgh, PA, 2014, pp. 4576-4582.

Thank you.

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