Advanced Approach for Stability Assessment of PHIL Setups Coupled by Clarke-Park Transform

Power-Hardware-in-the-Loop (PHIL) has been playing an increasingly important role in testing and validating new technologies, especially in smart grids. Two main concerns related to PHIL-based testing are stability and accuracy. Amongst others, time delay compensation and inclusion of feedback low-pass filter (LPF) using Clarke-Park transform (or dq0 transform) seem promising candidates for improving the stability and accuracy of the PHIL setup. However, the method for evaluating these PHIL setups has not been thoroughly developed since only simple Single-Input-Single-Output (SISO) models have been adopted for various stability criteria such as Nyquist or Routh-Hurwitz stability criteria. Therefore, this paper will provide a new and more comprehensive Multi-Input-Multi-Output (MIMO) approach for assessing the stability of the dq0-based PHIL setups. Compared to the conventional SISO approach, the proposed MIMO model can provide a better evaluation, and its effectiveness has been verified through empirical simulations using MATLAB/Simulink.