1. REN21:Renewables 2019 global status report.http://www.ren21.net/gsr‐2019(2019). Accessed 15 July 2020
2. MIGRATE:Deliverable D1.1 Report on systemic issues.https://www.h2020‐migrate.eu/downloads.html(2016). Accessed 15 July 2020
3. ENTSO‐E:Need for synthetic inertia (SI) for frequency regulation.https://consultations.entsoe.eu/system‐development/entso‐e‐connection‐codes‐implementation‐guidance‐d‐4(2017). Accessed 15 July 2020
4. Ørsted A/S:Enhanced frequency control capability (EFCC) ‐ Wind package report ‐ Frequency support uutlook.https://www.nationalgrideso.com/document/136161/download(2018). Accessed 15 July 2020