Enhanced control strategies of VSG for EV charging station under a low inertia microgrid. Issue 13 (1st October 2020)

• Record Type: Journal Article
• Authors: Rasool, Aazim; Yan, Xiangwu; Rasool, Urfa; Abbas, Farukh; Numan, Muhammad; Rasool, Haaris; Jamil, Mohsin
• Is Part Of: IET power electronics. Volume 13:Issue 13(2020)
• Page Start: 2895
• Page End: 2904
• Publication Date: 2020-10-01
• Subjects: reactive power control -- synchronous generators -- power system stability -- distributed power generation -- power generation control -- damping -- voltage control -- electric vehicle charging -- machine control -- power generation reliability -- electric impedance -- battery powered vehicles; charging loads -- quadratic coordinates -- vector diagrams -- circuit diagrams -- line impedances -- low inertia microgrid stability -- VSG controller -- reactive power control modes -- active power control modes -- multiVSGs system -- reactive power sharing -- power ratings -- Q‐V droop control -- damping -- multiple variable electric vehicle -- system reliability -- reduced system complexity -- virtual synchronous generators -- autonomous power allocation -- EV charging station; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2019.1592
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : The droop control strategies can realise an autonomous power allocation among virtual synchronous generators (VSGs) that can provide the recompenses of reduced system complexity and enhanced reliability. The stability of a low‐inertia microgrid can be improved by implementing a VSG, designed for the coordination between multiple variable electric vehicle (EV) based charging loads. This study mainly investigates two control schemes. Firstly, the instantaneous contribution from EV charging control for any disturbance that can provide adequate damping and inertia to a low‐inertia microgrid without degradation of the battery. Secondly, the adjustment of Q – V droop control is suggested by correcting the excitation voltage of a VSG. This method can reduce the influence of line impedances and power ratings on reactive power sharing in a multi‐VSGs system. Additionally, four different active and reactive power control modes of VSG are discussed to emphasise EV charging and discharging control through the VSG controller. These modes are explained through circuit and vector diagrams in direct and quadratic coordinates. The efficacy of the proposed strategies and their influence on power sharing is theoretically demonstrated and analysed. Finally, the theoretical results are validated through extensive simulation and experimental verification.