NERC TPL-001-4 Compliance Study: Application of A New Composite Load Model in Dynamic Voltage Assessment

This paper presents a transient and dynamic voltage performance compliance study to demonstrate the compliance of the ITC transmission systems in Michigan with NERC TPL-0014 Standard. The study was focused on the Michigan Lower Peninsula area transmission systems. A new composite load model (CMLD) was parameterized, tuned and applied in the study as load modeling plays an important part in system voltage recovery following a disturbance. The study included testing CMLD for ITC's 2019 and 2022 system summer peak load conditions with normal generation dispatch and stressed generation dispatch. Dynamic simulations were performed for a selected set of critical stability contingencies representing TPL001-4 P3, P4, P5, P6 and P7 contingency events. Corrective action plans such as adding a SVC were tested to mitigate voltage issues under such contingency events. Additionally, an extensive investigation of transient and dynamic voltage performance criterion currently implemented in various transmission entities such as ISOs/RTOs was conducted. Based on this investigation and dynamic simulation results, revisions to the current ITC transient/dynamic voltage recovery and dip criteria were recommended. This paper serves as a useful reference for other transmission systems in compliance with TPL-001-4 and for application of the new model CMLD.