Reconfigurable and flexible voltage control strategy using smart PV inverters with integrated energy storage for advanced distribution systems. Issue 1 (30th September 2019)

• Record Type: Journal Article
• Authors: Shuvra, Mahfuz A.; Chowdhury, Badrul
• Is Part Of: IET smart grid. Volume 3:Issue 1(2020)
• Page Start: 22
• Page End: 30
• Publication Date: 2019-09-30
• Subjects: energy storage -- power generation control -- power grids -- distributed power generation -- battery storage plants -- photovoltaic power systems -- invertors -- overcurrent protection -- power distribution faults -- voltage control -- distribution networks -- power distribution control; reconfigurable -- flexible voltage control strategy -- smart PV inverters -- integrated energy storage -- advanced distribution systems -- circuit topology -- utility‐owned photovoltaic inverters -- integrated battery energy storage system -- state‐of‐the‐art configurations -- distribution networks -- tight voltage regulation -- BESS maintenance -- solar‐storage system -- high penetration induced voltage fluctuation -- overcurrent protection -- added advantage -- inverter size -- high ramp -- solar irradiance variation -- local voltage regulation -- permissible range -- modified IEEE 33 bus medium voltage distribution network -- multiple inverters; B8120J Distribution networks -- B8250 Solar power stations and photovoltaic power systems -- B8260 Other power stations and plants -- C3110B Voltage control -- C3340H Control of electric power systems -- B8120K Distributed power generation; Smart power grids -- Periodicals; Computer science -- Periodicals; Energy industries -- Periodicals; Broadcasting -- Periodicals; 333.79110285
• DOI: 10.1049/iet-stg.2019.0018
• Languages: English
• ISSNs: 2515-2947

Abstract

Abstract : A novel circuit topology is proposed for utility‐owned photovoltaic (PV) inverters with integrated battery energy storage system (BESS) and compared to two state‐of‐the‐art configurations. The proposed topology offers flexibility and can be applied to a range of distribution networks for tight voltage regulation. During BESS maintenance, the solar‐storage system reconfigures itself for a self‐run mode of operation, and actively compensates high penetration induced voltage fluctuation without activating overcurrent protection of the inverter, which is an added advantage of this strategy. This advantage is achieved by slightly increasing the inverter size to reserve a portion of inverter's current‐carrying capability. A dynamic model of the new configuration is also developed to analyse its performance in providing fast response for high ramp up/down solar irradiance variation. As the proposed control strategy is implemented at the device level, the local voltage regulation is quite guaranteed to be in the permissible range. Results from the analysis performed on a modified IEEE 33 bus medium voltage distribution network with multiple inverters show evidence that the proposed strategy has the potential to mitigate voltage fluctuation in several extreme cases.