EMT Modelling Approach for Large Series Parallel DC Windfarm with HVDC Connection

This paper studies an aggregate Electro Magnetic Transient (EMT) model for system level studies of large DC series-parallel windfarms. This model prioritizes a trifecta of desirable functionalities: accuracy, computational efficiency, and versatility. It facilitates large scale windfarm simulations while enabling studies across various windfarm operations, including DC fault analysis, investigations within individual wind generator, and interaction studies between machines and strings within the windfarm. The model’s successful implementation is verified on PSCAD for a two-string 1 GW/525 kV test windfarm, demonstrating its ability to replicate the dynamics of a single-machine model under diverse operating conditions, and faults.