LVDC-Redefining Electricity
First International Conference on Low Voltage Direct Current
International
Electrotechnical
Commission
Bureau of
Indian Standards
New Delhi, India,
26 & 27 October 2015
Application of Energy Storage
Systems in LVDC
Pankaj Chaudhury
email : pankaj.chaudhury@vde.com
India
Contents :
1. Use Case :Telecom Tower (BTS) power supply topology with LVDC,
Renewable Integration and Energy Storage
2. Market Size and needed standardisation support for evolving ecosystem for telecom tower power supply with LVDC, Renewable
Integration and Energy Storage
3. Standardization status and activities for Li-ion battery energy
storage
Power Supply Schematic at Telecom Tower
BTS – Base Transceiver Station
PIU- Power Interface Unit
SMPS – Switch Mode power Supply
A typical Telecom Tower has power demand of 3-5 KW and to ensure a
continuous power supply, Diesel Generator is a permanent feature at
most of the sites.
Generation 1 Telecom Tower Power Supply Topology
( AC Solution)
When the power from electrical grid is available, PIU selects the best
phase and power is fed to SMPS. When the power from the grid is
interrupted, PIU will select batteries during transition and later send a
signal to diesel generator to turn on.
Source : ACME Telepower
Generation 2 Telecom Tower Power Supply Topology
(DC Solution)
In the absence of mains, DCPH ( Diesel generator producing 48V DC) is
feeding the power to BTS & Auxiliary loads which is also running on DC.
DCPH directly charges the batteries without any conversion loses.
Source : ACME Telepower
Off-grid Telecom Tower Power Supply Topology –
DC Nano-grid
LVDC Energy System with Renewable Integration and Energy Storage
Source : Mecc Alte
Off grid telecom tower : Renewable Integration with Energy
Storage
Source : Ecoultl
Summary
1. Telecom Tower is a best fit case for LVDC with renewable
integration and energy storage.
2. DC solutions at telecom tower are more efficient and
sustainable.
3. DC Nano-grids can easily be integrated with the existing
telecom towers ( off-grid or bad-grid or grid-secure sites) and as
these sites are directly serving the businesses so already a
business case exists.
4. Energy storage technologies is the key to integrate renewables
with DC Nano-grids.
5. Need for standards and open grid architectures that can help
integrate the increasing diversity of resources.
Market SizeTelecom Towers
Addition of Off-grid and Bad Grid
Telecom Towers (2014-2020 estimates)
 >5 million base stations
sites worldwide
 >3 million in developing
world
 Out of 3 million, 1.0 million
tied to unreliable grid
 650000 off-grid towers
 By 2020, global telecom
industry will deploy approx.
390,000 towers that are off-grid and 790,000 that are
in bad grid locations.
Source : www.gsma.com
Standardisation activities to support evolving
Eco-system
•
•
•
•
•
•
•
•
Energy Storage Systems
Battery Chargers , Rectifiers, DC-DC converters for LVDC application
DC Air-conditioning
DC operated Free Cooling Units
DC Generator
DC operated Auxiliary Loads (e.g. LED Lighting, Fan, Alarms)
DC Load Breakers, Fault protectors, Lightning Arrestors
Energy Management Unit
Standards addressing key issues of safety, interconnections and
interoperability will pave the way for faster integration of
Energy Storage Systems with LVDC power distribution.
Standards Li-ion energy storage systems
Source : VDE/DKE
Standards Li-ion energy storage systems
IEC 62485-2 Safety requirements for secondary batteries and
battery installations - Part 2: Stationary batteries
IEC 61427-1, -2 Secondary cells and batteries for renewable
energy storage - General requirements and methods of test - Part 1:
Photovoltaic off-grid application; Part 2: On-grid applications
Further Projects:
3 New Work Item Proposals (NWIP) IEC 62485-5 + -6, and
IEC 62619
DIN EN 50272-2 Safety requirements for secondary batteries
and battery installations - Part 2: Stationary batteries (predominantly
adopted in IEC 62485-2)
VDE AR-E 2510-2 Stationary electrical energy storage systems
intended for connection to the low voltage grid
VDE AR-E 2510-50 Stationary battery energy storage systems
Source : VDE/DKE
with lithium batteries – Safety requirements
Timeline for the standardization projects concerning stationary
Li-ion storage systems
Deadline for public comments VDE AR-E 2510-50
Deadline for public comments VDE AR-E 2510-2
Discussion of comments for VDE AR-E 2510-2
Discussion of comments for VDE AR-E 2510-50
CDV for IEC 62619; revised version
Decision on the NP projects in IEC
2016
2015
Revised version of VDE AR-E 2510-2
Revised version of VDE AR-E 2510-50
Source : VDE/DKE
Standards for LVDC – Deliverable of power distribution with better Energy Efficiency
IDENTIFICATION
TITLE
STATUS
1
EN 300 132-2 V2.4.6
Environmental Engineering (EE); Power supply interface at the input to
telecommunications and datacom (ICT) equipment;
Part 2: Operated by -48 V direct current (dc)
Publication – 12.2011
2
EN 300 132-3 V2.1.1
Environmental Engineering (EE);
Power supply interface at the input to telecommunications and
datacom (ICT) equipment;
Part 3: Operated by rectified current source, alternating
current source or direct current source up to 400 V;
Sub-part 0: Overview
Publication – 02.2012
3
EN 300 132-3-1
V2.1.1
Environmental Engineering (EE);
Power supply interface at the input to telecommunications and
datacom (ICT) equipment;
Part 3: Operated by rectified current source, alternating
current source or direct current source up to 400 V;
Sub-part 1: Direct current source up to 400 V
Publication – 02.2012
4
EN 301 605 V1.1.1
Environmental Engineering (EE);
Earthing and bonding of 400 VDC data and telecom (ICT) equipment
Publication – 10.2013
5
EN 302 999 V1.2.1
Safety; Remote Power Feeding Installations; Safety requirements for the
erection and operation of information technology installations with
remote power feeding
Publication – 03.2013
6
EN 302 099 V2.1.1
Environmental Engineering (EE);
Powering of equipment in access network
Publication – 08.2014
Thank You