Advanced frequency support strategy of photovoltaic system considering changing working conditions. Issue 2 (27th November 2017)

• Record Type: Journal Article
• Authors: Lyu, Xue; Xu, Zhao; Zhao, Jian; Wong, Kit Po
• Is Part Of: IET generation, transmission & distribution. Volume 12:Issue 2(2018)
• Page Start: 363
• Page End: 370
• Publication Date: 2017-11-27
• Subjects: photovoltaic power systems -- capacitors -- invertors -- frequency control -- solar power -- distributed power generation -- diesel‐electric generators -- power generation control; advanced frequency support strategy -- two‐stage three phase photovoltaic generation system -- direct current‐link capacitor -- deloading generation output -- inverter DC‐link capacitor -- virtual inertia characteristics -- deloading control strategy -- variable droop scheme -- frequency regulation -- microgrid system -- solar generator -- diesel generator -- DC‐link capacitor; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2017.0700
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : A novel system frequency support strategy is proposed for the two‐stage three phase photovoltaic generation system, which involves simultaneously utilising a direct current (DC)‐link capacitor and deloading generation output. When frequency variation is detected, the energy stored in an inverter DC‐link capacitor is utilised to enable virtual inertia characteristic for system frequency support. At the same time, a deloading control strategy is also activated to provide system frequency support based on reserved generation beforehand. To address impacts due to the changing working conditions with respect to irradiance and ambient temperature, a variable droop scheme is designed for dynamically adjusting the frequency regulation ability based on deloading. Case studies using a microgrid system embedded with a solar and diesel generator are carried out to verify the effectiveness of the proposed control strategy.