JWG C4.24/CIRED Power Quality and EMC Issues Associated with Future Electricity Networks

Background :

The increasing complexity of the electric power network and its management, growing demand and service quality expectations such as greater grid reliability, efficiency and security as well as environmental and energy sustainability concerns have triggered the next major step in the evolution of the electric power system towards a flexible power network or “Smart Grid”. To achieve this result requires the implementation of new technologies in power systems, including renewable energy sources (RES), distributed generation (DG) and latest information and communication technologies. Power quality is an important aspect of the power system, which cannot be neglected, and an adequate power quality guarantees the necessary compatibility between consumer equipment and the grid. The main factors influencing power quality are: generation equipment, end-user equipment and the grid itself. Each of these are expected to see significant changes in future electricity networks, and thus it is expected that power quality and EMC issues will also likely change. It should be noted here that the term power quality, as used by CIGRE, includes both voltage quality and continuity of supply. Two primary categories of issues have been identified:

  • At the consumer equipment level, which is connected to the distribution system,
  • At the power system level, that is on the transmission system.
Scope :

The following issues will be considered and addressed in further detail by the working group:

  • The emissions (harmonic and unbalance) by new types of devices connected to the distribution network as production (DG) or consumption (load), especially devices with active power-electronics interface including equipment connected to low-voltage and installations connected to higher voltage levels. This might require the evaluation of new measurement techniques, including a closer look at the frequency response of existing instrument transformers and sensors. The main question is, will this require new ways of considering power quality in the design?
  • The positive and negative impact of new smart distribution applications such as Volt &VAR control and feeder reconfiguration on power quality (voltage unbalance and harmonic flow) in the distribution system.
  • How these power quality issues at the distribution level may impact the transmission system.
Deliverables :

1. A CIGRE technical report/brochure providing answers to above issues, and guidelines for utilities and consumers.

2. An Electra publication containing major conclusions and recommendations.

Convener : F. Zavoda (Canada)

Progress Report 2013 (pdf, 80kB)

Progress Report 2014 (pptx, 140kB)

Progress Report 2015 (pptx, 140kB)

Progress Report 2016 (pptx, 142kB)