Field Tests of Impedance Measurement Using a Megawatt-scale Full-power Grid Simulator

The impedance measurement is becoming widely accepted for characteristic depiction and stability analysis of renewable energy generation. Usually, it is conducted using software or controller hardware-in-the-loop simulations, but rarely in field tests. This work presents the impedance measurements of a voltage source converter and various wind turbines in field tests. The tests were conducted by full-power grid simulators, which have been used in grid adaptability tests in China for years. In this paper, the test setup is introduced. The test procedures are given according to the related standards and documents. The test results are illustrated and compared. These field tests give clear frequency-domain characteristics of the devices under test and validate the theoretical analysis.