PJM System Stability Assessment Using Dynamic Load Models

This paper presents a stability study of the PJM system with the first-time and successful application of the latest composite load model (CMLD) proposed by NERC LMTF in the entire PJM footprint. The study follows NERC TPL-001-4 Standard which requires that system stability assessment include a load model representing the expected dynamic behavior of induction motors. The study investigated the impact of CMLD on the PJM system stability for normal and stressed operating conditions under various NERC planning and extreme contingency events. The study also compared the latest CMLD model with two other industry approaches of load modeling, i.e., complex load model (CLOD) and static load model (ZIP), both of which were previously used in the PJM system. Furthermore, for the first time, the study applied CMLD parameters to bus-level loads in the PJM system considering various factors such as weather, load class, location, etc. This paper focuses on the technical approach, critical contingency selection criteria developed, and dynamic load modeling used in the study of the PJM system. This paper contributes to the area of transmission planning as the industry is moving towards adopting CMLD in system stability assessment and serves as a useful reference for transmission planning studies using the CMLD model.