Open AccessVoltage control using smart transformer via dynamic optimal setpoints and limit tolerance in a residential distribution network with PV sources
Author(s) -
Manojkumar Rampelli,
Kumar Chandan,
Ganguly Sanjib,
Gooi Hoay Beng,
Mekhilef Saad
Publication year - 2020
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2020.0213
Subject(s) - photovoltaic system , voltage , voltage regulation , transformer , voltage drop , grid code , smart grid , distribution transformer , control theory (sociology) , engineering , automotive engineering , computer science , electrical engineering , electronic engineering , ac power , control (management) , artificial intelligence
Uncertainities and variations of power generation through photovoltaic (PV) sources are major challenges for their integration with the distribution grid. Voltage rise and voltage drop issues limit the increase in PV penetration and loading levels, respectively. Moreover, it is important to maintain voltage levels as per grid code while ensuring that the PV power generation is not curtailed. In this paper, a voltage control method using smart transformer (ST) via dynamic optimal setpoints and limit tolerance is proposed in a residential distribution network. Performance indicators are developed to understand the impact of the proposed method on the system voltage profile. A method to determine the optimal inputs for voltage control methods depending on the day‐ahead predictions of load demand and PV power profiles is developed. Further, a voltage control method of switching among three setpoints based on the voltage that determines the load side ac reference voltages for ST is proposed. The proposed method is compared with the method of switching between two setpoints based on current. The proposed method provides an improved voltage profile in the distribution network, which is tested on a CIGRE low voltage residential distribution network using PSCAD