© Hitachi, Ltd. 2014. All rights reserved. <Confidential>

Power System Information and Controls Div., Transmission & Distribution Systems Division, Power Systems Company, Hitachi, Ltd.

05/28/2014

Atsushi Nishioka

A brief introduction of June 20 presentations

© Hitachi, Ltd. 2014. All rights reserved.

Contents

1. Summary of June 20 presentations

2. TEPCO's operational technologies to prevent cascading outage

3. Power System Stabilization

4. Battery Energy Storage

1

© Hitachi, Ltd. 2014. All rights reserved. <Confidential>

1. Summary of June 20 presentations

2

■Contents of Cigre-TNC Technical Seminar on June 20. 13:00 – 14:45 Future Renewable Energy 1) “TEPCO's operational technologies to prevent cascading outage” presented by

Shinichi Imai, TEPCO • Voltage & Reactive Management • Observations and Recommendations on 2004 US Blackout • Adaptive UFLS operation in 311 earthquake

2) “Power System Stabilization” presented by Atsushi Nishioka, Hitachi

• Power System with Renewables --- What are the real issues? • Power System Analysis • Power System Stabilization Schemes • Energy Storage (Battery and Adjustable Speed PSH)

3) “Battery Energy Storage” presented by Kenji Takeda

• Storage System in general • Batteries and System • Energy Storage Solution

© Hitachi, Ltd. 2014. All rights reserved. <Confidential>

2. TEPCO's operational technologies to prevent cascading outage

3

“TEPCO's operational technologies to prevent cascading outage”, presented by Shinichi Imai, TEPCO, is a presentation from Japanese utility’s point of view, about their critical experiences and excellence of power system management.

This presentation includes:

• Voltage & Reactive Management --- Lesson learned from 1987 wide area blackout caused by voltage instability, what happened and how to improve power system voltage and reactive power management to prevent it.

• Observations and Recommendations on 2004 US Blackout --- TEPCO’s view to the 2003 North-East (US-Canada) blackout and recommendations for improvement of voltage and reactive management.

• Adaptive UFLS operation in 311 earthquake --- What happened at 311 great earthquake in 2011 and how UFLS saved power system from total collapse.

© Hitachi, Ltd. 2014. All rights reserved. <Confidential>

2-1. Voltage and Reactive Management

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Lesson Learned from 1987 blackout Improved voltage & reactive management

© Hitachi, Ltd. 2014. All rights reserved. <Confidential>

2-2. Observations and Recommendations on 2004 US Blackout

5

What happened in 2004 NE blackout

Recommendations on voltage management

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2-3. Adaptive UFLS operation in 311 earthquake

6

What happened in 2011 311 Great Earthquake

Recommendations on voltage management

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3. Power System Stabilization

7

“Power System Stabilization”, presented by Atsushi Nishioka, Hitachi, explains power system instability caused by a large scale of renewable integration and what we should do.

This presentation includes:

• Power System with Renewables --- What are the real issues? There are lots of discussions about renewable integration problems and solutions but some of them seem not realistic or not a big problem. We need to specify what are the real issues.

• Power System Analysis --- It is necessary to carefully study what are the real issues by extensive analysis of power system phenomena. This chapter explains what methods are possible for different phenomena with different reaction time.

• Power System Stabilization Schemes --- To maintain the power system stability, it is not sufficient by simple protection relays. It is necessary to consider the wide area protection scheme based on power system stability. This chapter explains “Transient Stability Control System” realized in Japan.

• Energy Storage (Battery and Adjustable Speed PSH) --- Supply/demand imbalance is another big issue for renewables integration. Energy storages are the solution for mitigating the imbalance and there are a lot of types of storage. This chapter explains Hitachi’s battery energy storage system and adjustable speed pumped storage hydro system.

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3-1. Power System with Renewables

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Demand/supply imbalance Voltage problem

Overload and stability issues

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3-2. Power System Analysis

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Various phenomena on power system

Various analysis

Example of study

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3-3. Power System Stabilization Schemes

10

Transient Stability Control System

Edison Award (2003)

Economical benefit of stability control

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3-4. Energy Storage (Battery and Adjustable Speed PSH)

11

Hitachi’s battery system

Adjustable Speed PSH

Benefits of Adjustable Speed PSH

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4. Battery Energy Storage

12

“Battery Energy Storage”, presented by Kenji Takeda, Hitachi, explains about battery energy storage from device level to system control.

This presentation includes:

• Storage System in general --- looks overview of global trend of energy storage system and Hitachi’s experiences for various applications.

• Batteries and System --- introduces lithium-ion, lead-acid batteries and charge/discharge control technologies.

• Energy Storage Solution --- explains various energy storage solutions including wind farm stabilization, hybrid BESS and smart grid simulation.

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4-1. Storage System in general

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Various ESS types and characteristics

Various applications

Hitachi’s experiences

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4-2. Batteries and System

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Lead-acid battery Lithium-ion battery

Charge / discharge control

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4-3. Energy Storage Solution

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Wind farm stabilization Hybrid BESS

Charge / discharge control Study with EGAT