Impact of digital time delay on the stable grid-hosting capacity of large-scale centralised PV plant
Peer reviewed, Journal article
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Original versionIET Renewable Power Generation. 2021, 15 (7), 1422-1435. 10.1049/rpg2.12097
Digital control system has been widely used for the inverters in PV plant. However, the effects of digital time delay of digital control system on grid-connected PV plants have not been fully studied. Therefore, in view of the stable grid-hosting capacity is a key parameter in the process of designing and operating of a grid-connected PV plant, this paper investigates in detail the influence of digital time delay on the stable grid-hosting capacity of large-scale centralised PV plant. Considering the practical situation of large-scale centralised PV plants, the stable grid-hosting capacity of plant is discussed with the conditions of inverters in PV plant have the same and different digital time delays. The analysis results revealed that stable grid-hosting capacity is varied with the digital time delay of inverter and the combination of the inverter with different digital time delays. Meanwhile, in order to realize a stable grid-connected PV plant in particular delay case, a procedure on how to determine the exact inverter number that can be used in a specific PV plant is provided. The theoretical analysis is verified by simulation and equivalent experiment results.