WG Area

The following are template files for the submitting a new Technical Brochure and the establishing a new Working Group (TOR).

Template and Specifications for TB

For more information for TB, please check the following web site.


Template for TOR 

Advisory Groups

RefTitleConvenerDates (Creation - Disbanding)
AG C4.1Strategic DirectionsZ. Emin (UK)Permanent
AG C4.2Institutional LiaisonW. A. Radasky (USA)Permanent
AG C4.3Tutorials and ConferencesM. Val Escudero (Ireland)Permanent

Current Active Working Groups - Task Forces

RefTitleConvenerDates (Creation - Disbanding)
WG C4.23Guide to Procedures for Estimating the Lightning Performance of Transmission Lines C. Engelbrecht (Netherlands)2012 - 2015
WG C4.25Issues related to ELF Electromagnetic Field exposure and transient contact currentsK. Kopsidas (UK)2011 - 2014
WG C4.28Extrapolation of measured values of power frequency magnetic fields in the vicinity of power links P. Rojas (Brazil)2012 - 2015
WG C4.31/CIREDEMC between Communication Circuits and Power Systems D. Thomas (UK)2012 - 2016
WG C4.32 Understanding of the Geomagnetic Storm Environment for High Voltage Power Grids W. A. Radasky (USA)2013 - 2015
WG C4.33Impact of Soil-Parameter Frequency Dependence on the Response of Grounding Electrodes and on the Lightning Performance of Electrical SystemsS. Visacro (Brazil) 2013 - 2016
WG C4.36Winter Lightning – Parameters and Engineering Consequences for Wind Turbines M. Ishii (Japan)2014 - 2017 
WG C4.37Electromagnetic Computation Methods for Lightning Surge Studies with Emphasis on the FDTD Method Y. Baba (Japan)2014 - 2018 
JWG C4/B4.38Network Modelling for Harmonic Studies M. Val Escudero (Ireland)2014 - 2017 
WG C4.39Effectiveness of line surge arresters for lightning protection of overhead transmission linesK. Tsuge (Japan)2015 - 2017
JWG C4.40/CIREDRevisions to IEC Technical Reports 61000-3-6, 61000-3-7, 61000-3-13, and 61000-3-14M. Halpin (USA)2015 - 2018
JWG C4/B5.41Challenges with series compensation application in power systems when overcompensating linesL. Haarla (Finland)2015 - 2017
JWG C4.42/CIREDContinuous assessment of low-order harmonic emissions from customer installationsI. Papič (Slovenia)2015 - 2018
WG C4.43Lightning problems and lightning risk management for nuclear power plantsT. Shindo (Japan)2017 - 2020
WG C4.44EMC for Large Photovoltaic SystemsE. Salins (Sweden)2017 - 2019
WG C4.45Measuring techniques and characteristics of fast and very fast transient overvoltages in substations and converter stationsS. Xie (China)2017 - 2021
WG C4.46WG C4.46 Evaluation of Temporary Overvoltages in Power Systems due to Low Order Harmonic ResonancesF. F. da Silva  (Denmark)2017 - 2019
WG C4.47WG C4.47 Power System Resilience (PSR WG)M. van Harte (South Africa)2017 - 2020
WG C4.48WG C4.48 Overvoltage Withstand Characteristics of Power System Equipment 35-1200 kVI. Dudurych (Ireland)2017 - 2020
WG C4.49WG C4.49 Multi-frequency stability of converter-based modern power systemsŁ. Kocewiak (Denmark)2018 - 2021
WG C4.50WG C4.50 Evaluation of Transient Performance of Grounding Systems in Substations and Its Impact on Primary and Secondary SystemsB. Zhang (China)2018 - 2021
JWG A2/C4.52High-frequency transformer and reactor models for network studiesB. Gustavsen (NO)2014 - 2018
JWG A1/C4.52Wind generators and frequency-active power control of power systemsN. Miller (USA)2015 - 2018
JWG C2/C4.37Recommendations for Systematic Framework Design of Power System Stability ControlY. Fang (China)2015 - 2017
JWG B4/B1/C4.73Surge and extended overvoltage testing of HVDC Cable SystemsM. Saltzer (Sweden)2016 - 2017
JWG B5/C4.61Impact of Low Inertia Network on Protection and ControlR. Zhang (UK)2017 - 2020
JWG C1/C4.36Review of Large City & Metropolitan Area power system development trends taking into account new generation, grid and information technologies

V. Simoes (BR)

S. Utts (RU)

2017 - 2019
JWG C2/C4.41Impact of high penetration of inverter-based generation on system inertia of networksM. Rampokanyo (South Africa)2018 - 2020

Disbanded Working Groups - Task Forces

RefTitleConvenerPublished TB
WG C4.503Numerical techniques for the computation of power systems, from steady-state to switching transientsJ. Mahseredjian (Canada)TB736: Power system test cases for EMT-type simulation studies (Published: 2018-08)
JWG C4/C6.35/CIREDModelling and dynamic performance of inverter based generation in power system transmission and distribution studies

K. Yamashita (Japan)

A. Cerretti (Italy)

TB727: Modelling of inverter-based generation for power system dynamic studies (Published: 2018-05) 
JWG C4.24/CIREDPower Quality and EMC Issues associated with future electricity networksF. Zavoda (Canada)TB719: Power quality and EMC issues with future electricity networks (Published: 2018-03) 
WG C4.27Benchmarking of Power Quality Performance in Transmission Systems D. Vujatovic (UK)TB718: BENCHMARKING OF POWER QUALITY PERFORMANCE IN TRANSMISSION SYSTEMS (Published: 2018-02)
JWG A3/B5/C4.37System conditions for and probability of Out-of-Phase A. Janssen (the Netherlands)TB716: SYSTEM CONDITIONS FOR AND PROBABILITY OF OUT-OF-PHASE - BACKGROUND, RECOMMENDATIONS, DEVELOPMENTS OF INSTABLE POWER SYSTEMS - (Published: 2018-01) 
WG C4.30EMC in Wind Generation Systems WH Siew (UK)TB707: EMC in wind energy systems (Published: 2017-11) 
WG C4.26Evaluation of Lightning Shielding Analysis Methods for EHV and UHV DC and AC Transmission-lines JL. He (China)TB704: Evaluation of lightning shielding analysis methods for EHV and UHV DC and AC transmission lines (Published: 2017-11) 
WG C4.34Application of Phasor Measurement Units for monitoring power system dynamic performanceU. D. Annakkage (Canada)TB702: Application of phasor measurement units for monitoring power system dynamic performance (Published: 2017-11)
WG C4/C6.29Power-quality aspects of solar powerJ. Smith (USA)TB672: POWER QUALITY ASPECTS OF SOLAR POWER (Publised: 2016-12)
WG C4.305Practices in Insulation Coordination of Modern Electric Power Systems Aimed at the Reduction of the Insulation LevelA. S. Telento (Croatia)No Published Items
WG C4.111Review of LV and MV Compatibility Levels for Voltage FluctuationM. Halpin (USA)TB656: REVIEW OF LV AND MV COMPATIBILITY LEVELS FOR VOLTAGE FLUCTUATIONS (Published: 2016-05)
WG C4.603Analytical Techniques and Tools for Power Balancing AssessmentsK. Uhlen (Norway)TB648: ANALYTICAL TECHNIQUES AND TOOLS FOR POWER BALANCING ASSESSMENTS (Published: 2016-02)
WG C4.410Lightning Striking Characteristics to Very High StructuresT. Shindo (Japan)TB633: LIGHTNING STRIKING CHARACTERISTICS TO VERY HIGH STRUCTURES (Published: 2015-10)
WG C4.206Protection of the High Voltage Power Network Control Electronics Against Intentional Electromagnetic Interference (IEMI)W. Radasky (USA)TB600: PROTECTION OF HIGH VOLTAGE POWER NETWORK CONTROL ELECTRONICS AGAINST INTENTIONAL ELECTROMAGNETIC INTERFERENCE (IEMI) (Published: 2014-11)
WG C4.112 Power Quality Monitoring in Flexible Power Networks J. Milanovic (UK)TB596: GUIDELINES FOR POWER QUALITY MONITORING – MEASUREMENT LOCATIONS, PROCESSING AND PRESENTATION OF DATA (Published: 2014-10)
WG C4.207EMC with communication circuits, low voltage systems and metallic structures D. Thomas (UK) TB592: Guide for Assessment of Transferred EPR on Telecommunication Systems due to Faults in A.C. Power Systems (Published: 2014-08)
WG C4.208EMC in HV Substations and Generating StationsWH. Siew (UK)TB535: EMC within power plants and substations (Published: 2013-04)
WG C4.303Pollution and environmental influence on the electrical performance of power systemsC. Engelbrecht (NetherLand)



WG C4.306Insulation Coordination of UHV AC systemsE. Zaima (Japan) TB542: Insulation Coordination for UHV AC Systems (Published: 2013-06) 
WG C4.307Resonance and Ferroresonance in Power Networks and Transformer Energization Studies Z. Emin (UK) 

TB569: Resonance and Ferroresonance in Power Networks (Published: 2014-02) 

TB568: Transformer Energization in Power Systems: A Study Guide (Published: 2014-02)

JWG A2/C4.309Electrical Transient Interaction between Transformers and the Power System A. Rocha (Brazil) 


TB577B: Electrical Transient Interaction Between Transformers and the Power System  PART 2: CASE STUDIES  (Published: 2014-04)

WG C4.407Lightning Parameters for Engineering ApplicationsV. Rakov (USA)TB549: LIGHTNING PARAMETERS FOR ENGINEERING APPLICATIONS (Published: 2013-08)
WG C4.408Lightning Protection of Low-Voltage Networks A. Piantini (Brazil) TB550: LIGHTNING PROTECTION OF LOW-VOLTAGE NETWORKS (Published: 2013-08) 
WG C4.409Lightning Protection of Wind Turbine Blades S. Yokoyama (Japan) TB578: Lightning Protection of Wind Turbine Blades (Published: 2014-04) 
WG C4.502 Power system technical performance issues related to the application of long HVAC cables W. Wiechowski (Poland)TB556: POWER SYSTEM TECHNICAL PERFORMANCE ISSUES RELATED TO THE APPLICATION OF LONG HVAC CABLES (Published: 2013-10) 
JWG C4/B4/C1.604 Influence of Embedded HVDC Transmission on System Security and AC Network Performance S. Henry (France)TB536: Influence of Embedded HVDC Transmission on System Security and AC Network Performance (Published: 2013-04) 
WG C4.605Analytical Techniques and Tools for Power Balancing Assessments J. Milanovic (UK)TB566: MODELLING AND AGGREGATION OF LOADS IN FLEXIBLE POWER NETWORKS (Published: 2014-02) 

Background:The worldwide drive to reduce carbon emissions in the environment has led to the global community looking for alternative sources of energy that are less polluting and cheaper to harness than traditional primary energy sources that are currently widely used such as fossil fuel sources. This has led to the widespread introduction of renewable energy sources (RES) as alternative energy sources for the future. While the introduction of RES generation onto the electrical grid brings with it some major benefits, it is certainly not without challenges. 
Not all RES are non-synchronous but a majority of them are and this is expected to have a significant impact on the way the power system is operated. One major challenge with the introduction of non-synchronous generation on the grid is the reduction of natural inertia that is provided by conventional synchronous machines on the grid. This natural inertial response from synchronous generating sources helps in damping frequency excursions during system disturbances such as generator trips or sudden loss of a large load. With depleting inertial energy, the rate of change of frequency (RoCoF) increases substantially, leading to a lower nadir, such that Primary Frequency Response (PFR) systems and even defence schemes such as Under Frequency Load Shedding Schemes (UFLS) may fail to protect the system during major frequency excursions. This has become a big challenge for system operators across the globe as penetration of inverter-based renewable sources is increasing tremendously and RES are seen as an imminent replacement of conventional generating sources. System operators have to be prepared for a more dynamic system, not only operating the system within tight security constraints, but also performing congestion management and facilitating a competitive electricity market. 
Scope:The objective of this WG is to advise and formulate philosophies for system operations in order to prepare the on-going energy transition. Primary Frequency Response studies will be carried out (or existing studies will be reviewed) in order to analyse and mitigate against the impact of the reduction of synchronous inertial energy on the power system as a result of integration of non-synchronous renewable generation using various networks around the globe as case studies. The integration of the existing knowledge between system operation and system performance, as well as the interaction with system planning, is crucial to achieve the proposed goals.   
The JWG will address amongst others the following issues: 
a) Review of previous (CIGRE) work relating to the current topic (e.g. TB 527 and TB 666) and the connection with on-going work (e.g. JWG C2/B4.38 and JWG C4/C6.35).
b) Survey existing practises used to determine primary frequency response requirements. 
c) Define operational measures to manage the dispatch of inertia and reduce the risk when operating with low inertia on the system. 
d) Quantify Primary Frequency Requirements (PFR) with increasing RES penetration
Demand Response (DR) requirementsPrimary Reserves requirementsFast Frequency Response (FFR) techniques and requirementsTrade-offs between inertia and FFR /DR techniques (checking if FFR can be a substitute for inertial response) e) Methodology to establish rate of change of frequency (RoCoF) limits with increasing non-synchronous RES penetration levels, and the integration of the methodology into the operational environment. 
f) Review existing Grid Code policy around PFR requirements in light of higher penetration levels of RES. 
g) Investigate possible control strategies for inverter-based generation in order to provide wider future designs possibilities of inverters/converters and to achieve the most efficient way to use the technology. Also to work in connection with JWG C2/B4.38. 
h) Survey possible/ existing mitigation techniques and increased system controllability
Synthetic inertia (including technologies based on voltage source converters)Flywheels etc.FFRDR etc.Deliverables:Technical Brochure and Executive summary in Electra
Electra report
Time Schedule:Start: July 2018      Final Report: Dec 2020
Convener: Mpeli Rampokanyo (South Africa)