Benchmark Study on Impedance Identification Methods for Grid Connected Converters

Inhalt:
The increasing number of renewable energy sources connected to the grid also introduces large number of different power electronics converters into the system. This paper provides a comparative benchmark of methods to identify the frequency characteristics of a grid connected converter model. Analytical open-loop and closed-loop models are verified through offline simulations and real-time hardware-in-the-loop measurements. To verify the model and identify the transfer functions linking input and output variables, a pseudo-random binary sequence signal is used for perturbation in both cases.