September 03, 2021Liaison Report Ver 2.30

SyC LVDC & LVDC for Electricity Access

Since May 2017

30 members (22 P-members, 8 O-members)

Scope

Standardization in the field of Low Voltage Direct Current (hereinafter referred to as LVDC) in order to provide systems level standardization, coordination and guidance in the areas of LVDC and LVDC for Electricity Access.

To widely consult within the IEC community and the broader stakeholder community to provide overall systems level value, support and guidance to the TCs and other standards development groups, both inside and outside the IEC.

To bring urgency to development of standards for Electricity Access enabling inclusive development of all communities.

SyC

LVDC

WG1

LVDC publications

for Electricity

Access

CAG

Chair’s Advisory

Group

AhG2

DC Data Centres

and Industrial

Automation

AhG6

Organizing

Committee

World DC Summit

AhG5

Marketing work of

the SyC LVDC

JWG9

LVDC distribution

(Managed by TC

8)

WG2

Use-cases for

public LVDC

distribution

WG3

Parameters for

protection and

safety in DC

SyC LVDC

Open Forum (OF1)

700+ members

Reporting on global status of DC for Data Centers and DC supply for industrial automation. Likely to submit final report in Sept 2021

WG1LVDC publications for

Electricity Access

AhG2DC Data Centres and

Industrial Automation

JWG9LVDC distribution

(Managed by TC 8)

WG2Use-cases for public

LVDC distribution

WG3Parameters for

protection and safety

in DC

Since Feb 2017, working on LVDC standard on electricity access. Under discussion in the SMB

Developing SRD on some of the use-cases in the public LVDC distribution. Likely publication of SRD in mid-2021

Looking for differences between AC and DC protection and safety from fire and touch. Likely publication in 2021

Systems aspects of LVDC distribution. Assessment of standard voltages and power quality requirements for LVDC distribution (PWI TR 8-2 ED1)

AhG5LVDC Electrical

distribution draft

roadmap proposal

Prepare roadmap for LVDC distribution with due regard for safety, protection and installation rules. Submitting final report in Sept 2021

AhG6Organizing

Committee World DC

Summit

World DC Summit, Suzhou, CN, March 2022 // Hosted by the CN NC // Showcasing DC use-cases, current status of adoptions, opportunities, challenges

TC 1 TerminologyTC 8 System aspects of electrical energy supplyTC 13 Electrical energy measurement and controlTC 21 Secondary cells and batteriesTC 22 Power electronic systems and equipmentTC 23 Electrical accessoriesTC 34 Lighting

TC 59 Performance of household and similar electrical appliances

TC 61 Safety of household and similar electrical appliances

TC 62 Electrical equipment in medical practice

TC 64 Electrical installations and protection against electric shock

TC 82 Solar photovoltaic energy systemsTC 88 Wind energy generation systemsTC 100 Audio, video and multimedia systems and equipmentTC 105 Fuel cell technologies

TC 108Safety of electronic equipment within the field of audio/video, information technology and communication technology

TC 109 Insulation co-ordination for low-voltage equipment

TC 120 Electrical Energy Storage (EES) Systems

SC 121A Low-voltage switchgear and controlgear

CIS/BInterference relating to industrial, scientific and medical radio-frequency apparatus, to other (heavy) industrial equipment, to overhead power lines, to high voltage equipment and to electric traction

SyC SM Smart ManufacturingSyC Smart Cities Electrotechnical aspects of Smart CitiesSyC Smart Energy Smart Energy

AFSEC African Electrotechnical Standardization Commission

IEEE-SA IEEE Computer Society/Software & Systems Engineering Committee

ITU-T/SG 5 International telecommunication Union - Standardization Bureau - Study GroupGOGLA Global Offgrid Lighting Association for enabling lighting access

Lia

iso

ns

Why LVDC, and why now?

1950s~1890s~ 2000s~

AC dominates

Large power plants

Coal, oil, nuclear fuel

Mainstream, important

Environment & energy

efficiency; non-issues

Tech drivers: AC systems, high

power loads, GLS lighting,

electric motors

AC and DC coexist

Small power plants

Coal, oil, wood fuel

Novelty, elitist

Environment & energy

efficiency; non-issues

Tech drivers: AC, DC

innovation, replacing smoky

lighting

AC challenged

Small local power plants

Coal, oil, gas, wood, hydro,

Solar

Essential necessity

Environment & energy

efficiency; Global agenda

Tech drivers: Electronics,

solar PV, batteries, LED

lighting, Energy efficiency,

• AC is defined with a frequency and with some power

quality thresholds

• DC is not.

What is DC? How to define it?

• Guidelines for selecting suitable voltage and Earthing system in different operational environments

• Applicability of power electronics based protection equipment

• Fault detection and identification techniques

• Conformity testing of equipment and devices

• EMC requirements for networks, equipment and devices

• Standards for special d.c. products that do not exist in AC network

• Matrix of voltage, current and distance applicable in DC installations

• Economical Recommendations for wire cross sections in copper and aluminium

• Selectivity of connectors for LVDC (criterion of selection and use-cases)

• Topology for creating capacity for EVs and integrating EVs with Renewable Energy

• Classification & topology for practical DC Microgrids in on-grid and off-grid environment

• Safety and installation of photovoltaics for productive use applications (DC devices)

• DC power consumption metering

• Segregation between AC and DC circuits

• Protection against electric shock and updating of installation rules

• DC Use-cases in industry

Gaps in LVDC Standardization

List curated from Doc SMB/5958/R

TC8 / JWG9 Content TR 63282 ED1.0 (1)Assessment of standard voltages and power quality requirements for LVDC distribution

Work of the TC8 JWG9 (TC8 and SyC LVDC)

4. Topologies of DC systems 4.1. Passive DC systems 4.2. Active DC systems 4.3. Examples of use cases for LVDC 5. LVDC voltage/voltage band 6. Power quality phenomena relevant to LVDC networks 6.1. Relationships between Voltage band and Power Quality in LVDC systems 6.2. Supply voltage deviation6.3. Ripple and High Frequency Noise 6.4. Voltage swell and Voltage dip 6.4.1. Voltage swell6.4.2. Voltage dips

6.5. Voltage supply interruption 6.6. Rapid voltage change 6.7. Surge 6.8. Voltage Unbalance7. Recommandations 7.1. Recommended Voltages 7.2. EMC and Compatibility levels 7.3. Power Quality Recommendations 7.4. Measurement methods 7.4.1. DC system r.m.s. value integration time 7.4.2. DC power quality measurement methods

TR 63282 Introduction

03

02

01

04

Topologies of DC systems

Recommendations

LVDC voltage /voltage band

Power quality phenomena

The recommendations are offered forinput to several TCs in charge ofstandardization of different issues andcoordinated by SyC LVDC.

In DC system, the voltage should bemaintained at a certain range, defined asvoltage band. In a certain state theallowed voltage and dynamics aredifferent from AC system.

The topologies of DC system aredifferent from AC system. Thetopologies affect the DC systemperformance.

Power quality in DC system issimilar to AC system. Thephenomena in DC system isredefined.-

IEC TR 63282:2020 LVDC systems - Assessment of standard voltages and power quality requirements

11

TC8 / JWG9 Future Work

Further discussion on Preferred voltage or voltage band in DC systems

The voltage band is a new concept. We will revise in ED2 to make the definition clearly. We should specify the preferred

voltage based on the wide survey of the relevant technology. We will also communicate with TC8-MT1. The objective of

JWG9 is to provide input for TC8-MT1.

12

To identify the scope and framework of DC related power quality standardization

Committee SyC LVDC to formulate the road map of the standard, and we JWG9 will clarify the scope and framework of

TR under the guidance of the committee.

Publish Edition 2 incorporating updates and comments

JWG9 to update the TR with comments received and reorganize the document.

Electricity Access StandardizationIEC 63318 ED1WG1 work on Electricity accessEnabling each home to have up to;• 2 light bulbs,• Small TV,• USB charging point• Simple kitchen appliance

Work led by IN NC experts in WG1, following the World Bank Multi Tier Framework for energy access.

World Bank Multi Tier Framework (https://www.esmap.org/node/55526)

PT/63255 : Predicting Electrical Compatibility

• Project approved May 2019

• Will for the first time enable open LVDC electrical ecosystems, where an electrical engineer does not need to approve every attached load

• Essential to get LVDC to scale in homes, offices and shops

• We will not meet SDG#7 in 9yrs in off-grid areas (perhaps 150million households) without it!

• A proactive approach is essential – waiting for a de facto standard to emerge would:

− Take too long

− Entail large amounts of equipment that quickly becomes obsolete

− Possibly give one company an unreasonable monopoly

• The project is still unfunded

IEC SRD 63317 ED1: LVDC industry applications

• Collection of industrial applications and use-cases for LVDC− This systems reference deliverable applies to describe the certain

aspects of standardization of LVDC in industrial applications.− These industrial applications apply to the secondary economic

sector where the processing of resources obtains to theproduction, distribution and storage of physical goods, especiallyin a factory or special area.

− This document covers the generation, distribution andconsumption of LVDC power at these premises.

− This document follows the IEC Systems Approach from the domainto the gap analysis and give guidance by describing referenceimplementation

• Germany R&D Project, https://dc-industrie.zvei.org/ Source: DC-Industrie

PWI SyCLVDC-1 ED1: Use Cases of Last Mile LVDC Distribution(WG2)

• Typical use-cases are street lighting, road-side advertising, traffic signaling, public parks…

• Developing a repository of such use-cases

• Questionnaire to be circulated soon

• Schneider Electric acquires DC Systems B.V. to advance innovations in electrical distribution,

• UK Future Homes Standard

• Canada: Stakeholder feedback identified several key items that form the value proposition for DC microgrids in buildings. The highest-rated values included energy savings; interoperability of systems; integration of renewable energy, including the reliability/business continuity it provides; and improved experiences.

News from the world of DC

• LVDC work by EMerge Alliance,− The EMerge Alliance is an open, membership-based, not-for-profit industry

association formed in 2008 to create and promote the adoption of new standards for direct current “DC” and hybrid AC/DC power infrastructure in buildings, neighborhoods and communities to improve their flexibility, sustainability, resiliency and economic performance.

• NEMA manages IEC work on LVDC

@LVDC in USA

• Use case presentations

• LVDC business discussion

• Technical challenges and opportunities, dialog

• TC/SC/SyC engagement

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IEC: we make a difference!Bushfires should make us think about energy resilience, and micro-gridshttps://reneweconomy.com.au/bushfires-should-make-us-think-about-energy-resilience-and-micro-grids-97974/

For more Info

IEC LVDC Zone

includes content from past conferences

downloads area (brochures, mnemonic, public content)

IEC LVDC Open Forum

The LVDC Technology Paper

LVDC: electricity for the 21st century

LVDC TEDx Talk:

Direct Current, Electricity in the 21st Century, for all | TED Talk

IEC LVDC LinkedIn Group