Page 80 - EV매거진_9호(3월)_e-book

IEA Country Report

price signal provided to users through retail requirements.
rates. Decreasing system inertia may start to become a
challenge at higher shares of VRE or in specific
regions with high concentrations of VRE. The
solutions range from the most technically mature,
such as maintaining a minimum of conventional
generation or installing synchronous condensers,
to introducing mechanisms to enable synthetic
inertia from VRE or developing grid-forming
converters. There is a growing body of
experience globally on technical solutions to
strengthen systems with a high penetration of
converter-based assets. Deployment strategies
should consider the technical and economic
Operational security implications.

System-friendly deployment of variable
renewables will be essential to ensure the Long-term planning
operational security of Korea’s power system. Better long-term planning will be needed to
This involves considering the technology mix ensure adequacy and operational security with
between different VRE resources, managing higher shares of renewables. For example,
their geographical spread and enabling their assuming that load patterns remain consistent,
participation in the provision of system services VRE deployment is expected to shift the system
(from frequency regulation to voltage, etc.). One peak later into the evening as well as increase
option is to co-ordinate network development it by around 10 GW by 2034. Additionally, while
and VRE deployment, as done with renewable Korea has already introduced probabilistic
energy zones (REZs), particularly given the plans planning to some extent, it may be helpful to
for offshore wind deployment and current grid introduce more detailed analysis of more
constraints. diversified scenarios that account for, among
Improving the visibility of VRE generators other factors, climate-related extreme events
and the quality of generation forecasts is and VRE or load variability.
important for maintaining operational security One of the main developments enhancing
and mitigating the cost of VRE integration. electricity system planning is making use
Improving the grid code is fundamental to of multiple reliability indicators rather than a
ensuring that all assets, from VRE to distributed single indicator. It is important to account for
energy resources, are correctly equipped and all dimensions of outage risk, such as average
all market participants share their forecasts and frequency, volume of energy not served and
real-time data with the system operator on frequency of extreme events. This approach
time. Korea has already taken significant steps is vital to understand extreme as opposed to
to update its grid code, but it is important to average events.
continuously review and update it to account for
both technological change and emerging system Developing an understanding of the economic