Open AccessHierarchical coordination strategy for three‐phase MV and LV distribution networks with high‐penetration residential PV units
Author(s) -
Tang Wei,
Cai Yongxiang,
Zhang Lu,
Zhang Bo,
Wang Zhaoqi,
Fu Yu,
Xiao Xiaobing
Publication year - 2020
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
eISSN - 1752-1424
pISSN - 1752-1416
DOI - 10.1049/iet-rpg.2020.0866
Subject(s) - voltage , ac power , power flow , power (physics) , computer science , control theory (sociology) , three phase , low voltage , electric power system , control (management) , engineering , electrical engineering , physics , quantum mechanics , artificial intelligence
This paper presents a hierarchical coordination method to improve operation conditions between the medium‐voltage distribution network (MVDN) and low‐voltage distribution networks (LVDN) considering high‐level residential PV units integrating LV distribution networks. It addresses the following issues: (i) rapid power fluctuations and unbalance caused by high‐level residential PV units passes to the MV distribution network via the point of common coupling (PCC) and thus increase operation challenges; (ii) power fluctuations, voltage violations and unbalance simultaneously happens in the LVDNs. A hierarchical coordination structure the MVDN and LVDN is proposed. In the MV level, a centralized dispatch method based on three‐phase optimal power flow is developed in the timescale of minutes to minimize the power losses, unbalance and PCC adjustments, which are achieved by regulating energy storage systems (ESSs) and PV inverters in the LV level. In the LV level, a distributed control model based on a consensus algorithm is proposed in the timescale of seconds to track the reference active (or reactive) power at the PCC given by the MV level and mitigate its fluctuations. Simulations studies are performed to verify the proposed method.