IEC 61850-90-9 - Use of IEC 61850 for Electrical Energy Storage Systems

IEC TC 57 has just published a 114 page new draft technical report:

57/1998/DC

Draft IEC TR 61850-90-9, Communication networks and systems for power utility automation – Part 90-9: Use of IEC 61850 for electrical energy storage systems

Comments are welcome until 2018-08-17

"This technical report provides necessary information within 61850 based object model in order to model functions of a battery based electrical energy storage system as a DER unit. For intelligently operated and/or automated grids, storing energy for optimising the grid operation is a core function. Therefore shorter periods of storing energy with charging and discharging capability is also an indispensable function. Charging and discharging operations need to be modelled thoroughly and are in the focus of this technical report. ...
An Electrical Energy Storage system (EESS) is a system which is used for the purpose of intermediate storage of electrical energy. The type of storage, the amount of energy, charging and discharging rates as well as self-discharge rate and many other characteristics are technology dependent and therefore can be very different. However, the general meaning of the characteristics and parameters are identical.
The objective of this document is to define a standardized and general approach to information
modelling for operating an EESS regardless of any specific technique, which supports an efficient way of integrating an EESS into grid operation and other businesses.
Various types of EESS, such as battery, pumped hydro, superconducting magnetic energy storage, flywheels, etc., are defined in “IEC White Paper on Electrical Energy Storage.” According to the the white paper, EESS systems are classified by energy form, advantages/disadvantages to the specific usages or the purpose of the implementation. ... "

IEC 61850-90-9 Models for Electrical Energy Storage Systems

IEC 61850 Part 90-9: Use of IEC 61850 for Electrical Energy Storage Systems is progressing these days. The latest draft describes the basic functions of Electric Energy Storage System (EESS) and the information model of the interface to integrate EESS in intelligent grids and establish the necessary communication with standardised data objects. The next official draft is expected to be published soon.
This draft  is  connected  with  IEC 61850-7-420,  as  well  as  IEC 61850-7-4:2010, explaining how the control system and other functions in a battery based electric energy storage unit utilizes logical nodes and information  exchange services  within the IEC 61850 framework to specify the information exchanged between functions as well as information that individual functions need and generate. The first Edition of IEC 61850-7-420 provides an information model for batteries which was derived from the proposed data objects of part 7-4. Those data objects follow the requirements of batteries that are supposed to be used in substations as an auxiliary power system and as backup power supplies. For this purpose it was sufficient to only model the discharge function. Therefore it is necessary to prepare new logical nodes to be applicable for grid connected electrical energy storage systems.
This draft provides necessary information within 61850 based object model in order to model functions of a battery based electrical energy storage system as a DER unit. For intelligently operated and/or automated grids, storing energy for optimising the grid operation is a core function. Therefore shorter periods of storing energy with charging and discharging capability is also an indispensable function. Charging and discharging operations need to be modelled thoroughly and are in the focus of this technical report.

The draft lists several use-cases found in the real world:

UC1 Retrieve current status and capabilities of EESS
UC2 Set charging power to EESS
UC3 Set discharging power to EESS
UC4 Set Operating mode/ schedule  to EESS
UC5 EESS Alarm / Asset Monitoring

UC1 current capability /status information as an example:

1-2-1 EESS Generic Status Reporting
•  ES-DER on or off
•  Storage available or not available
•  Inverter/converter active power output
•  Inverter/converter reactive output
•  Storage remaining capacity (% and/or kW）
•  Storage Free capacity (% and/or kW）

1-2-2 EESS inverter /converter status
•  Current connect mode:  connected or disconnected at its ECP
•  Inverter on, off, and/or in stand-by status: inverter is switched on (operating), off
(not able to operate), or in stand-by
•  mode, e.g. capable of operating but currently not operating
•  DC current level available for operation:　there is sufficient current to operate
•  Value of the output power setpoint
•  Value of the output reactive power setpoint
•  Value of the power factor setpoint as angle (optional)
•  Value of the frequency setpoint (optional)

1-2-3 EESS (battery) internal status
 •  Amp-hour capacity rating
•  Nominal voltage of battery
•  Maximum battery discharge current
•  Maximum battery charge voltage
•  High and　Low battery voltage alarm level
•  Rate of output battery voltage change
•  Internal battery voltage
•  Internal battery current
•  State of charge (energy % of maximum charge level)
•  Reserve (Minimum energy charge level allowed, % of maximum charge level)
•  Available Energy (State of charge – Reserve)
•  Type of battery

1-2-4 Power measurements
•  Total Active Power (Total P): Value, High and Low Limits
•  Total Reactive Power (Total Q): Value, High and Low Limits
•  Average Power factor (Total PF): Value, High and Low Limits, and averaging time
•  Phase to ground voltages (VL1ER, …): Value, High and Low Limits

More to come ...

WWW - Water, Wine, and Watt-hours

When it comes to get prepared for a blackout, what do you need to survive? The "World Wide Web" (WWW) will likely not work anymore.

What's about "Water, Wine, and Watt-hours"? The new WWW.

It is still a challenge to store Watt-hours - a battery of, let's say 20 kWh would dry out within short time. It would not help in winter to survive. I would like to harvest the sun in summer, convert the electric kWh into hydrogen kWh or methane gas kWh and store it locally or somewhere outside the city.

In wintertime we could use it for heating and generate electricity.

I look forward to purchasing a system that could generate hydrogen or methane gas and store it. It may be round the corner - who knows.

IEC is about to prepare the "Use of IEC 61850 for electrical energy storage systems"

IEC TC 57 has just sent a 75+ pages draft document for comments by the national committees:

Draft IEC TR 61850-90-9 – Communication networks and systems for power utility automation – Part 90-9: Use of IEC 61850 for electrical energy storage systems

See: 57/1715/DC

The document is a very comprehensive document that provides a list of use-cases and solutions on how to use and extend the IEC 61850 models for electrical energy storage systems.

The



It is recommended for the various stakeholders to get more deeply involved into the further steps to get a standard information model for electrical storage systems!!

Sample use-case:



This document fits well into the set of drafts that are needed for power distribution systems.

More to come!

U-Bahn-Fahrplan Energiewende – Eine gute Übersicht

Energiewende – ein Begriff, der international bekannt ist! Was ist darunter zu verstehen? Sehr viel!! Es geht um Energie – weit über Strom-Erzeugung, –Transport, –Verteilung und –Verbrauch hinaus.

Eine sehr gut zu lesende und sehr leicht verständliche Zusammenfassung auf 16 Seiten sollte jedem Bürger über 15 Jahre als Pflicht-Lektüre empfohlen werden sollte!

Sehr interessant ist der “U-Bahn-Fahrplan”, der alle wesentlichen Aspekte der Energiewende grafisch darstellt:

Hier können Sie die komplette Grafik “Gesamtübersicht Energiewende” herunterladen [jpg, 1,6 MB]

Download der Zusammenfassung [16 Seiten, pdf, 4 MB]

Noch Fragen?

IEC 61850 wird in vielen, zur Realisierung der Energiewende notwendigen Technologien eine große Bedeutung zukommen – Mit Sicherheit!

Bildquelle: IFEU-Institut

Wind and Solar Gas – A Challenging Storage Option

As you know, there is a crucial challenge with renewable power generation – wind and solar power are often generated during times when it could not be transported to the load centers! Usually generation has to stop – even the wind is blowing and the sun is shining. So, how to work around?

In November 2011 there was a big conference in Berlin to discuss a new way of storing energy: the existing natural gas network may become a cornerstone for a renewable energy system that provides huge storage, transport and distribution capacities that are hundred times larger than the electric power grid.

Electrons and gas? Yes!

The “SolarFuel” power-to-gas method could convert renewable electricity into CO2 neutral, renewable natural gas.

What does it all mean:

• More renewable electricity could be generated.
• Renewable natural gas stores the energy for days, weeks and months due to huge capacities in the tubes used for transportation and distribution
• Energy is accessible everywhere and at any time.

I remember that our gas utility here in Karlsruhe buried huge tubes (some 100 cm in diameter) in the 90s – this allows to transport and store more gas (volume increases to the second of the diameter). Copper wires can transport more electric power with bigger cables – but the wires do not store more electric power ;-)

The gas storage in Germany could (if full) be tapped for some 6 month!!

The new discussion is about Hybrid Grids: Electric Power, Gas and Heat. More to come soon.

One thing is for sure: We will be challenged by a steep growing demand of Information Models to be added to IEC 61850 for the many aspects of hybrid grids. UCA (the forerunner of IEC 61850) was adapted by the GRI (Gas research institute, USA) for use by gas utilities. This effort culminated in an evaluation of UCA in a gas utility environment at Pacific Gas and Electric Company, San Francisco, in the 90s.

Excerpt of logical nodes (called Bricks in UCA) from the document: Integrated UCA(TM) for Gas Industry / Volume 2: Gas Industry Device Object Models.

• Pressure monitors for inlet, intermediate and outlet gas (PMON0, 1, 2 respectively)
• First stage pressure regulating valves (PRVL0, PRVM0 and PRVH0 for low, mid and high range valves respectively
• Gate station flow monitors for low, medium and high flow rates (GSFL0, GSFM0, and GSFH0 respectively)
• Gas quality monitor (QMON0):

Click HERE for the list of 6 reports from GTI (former GRI) [2000]
Click HERE to get some more information on wind and solar gas.
Click HERE for a comparison of IEC 61850 and UCA [2004].

IEC 61850 logical nodes for the gas and heat application domain could easily be defined and (if needed) standardized.