Modeling of the effect of distributive generation on voltage stability on a large metropolitan district

A theoretical foundation for modeling, analysis, and evaluation of large-scale application of distributive generation (DG) technologies connected to the bulk transmission grid is developed to answer questions concerning DG penetration levels as they affect system voltage.; This work examines the penetration of DG on a dense metropolitan area by developing a non-specific distribution feeder model. There is significant detail to measure the effects of the feeder and DG penetration. The modeling approach replaces the existing aggregate load with an approximated model of the feeder, distribution transformers, and load in order to study the effects of these devices on voltage stability. To capture the effects of increased DG, a non-specific (not based on technologies) inverter device is modeled on the end of each feeder. This inverter model allows for depiction of commutation failure due to low voltage on the feeder to be captured, and is used to develop the effects of the distribution feeder from a bulk transmission perspective.; A case study, using the methods developed in this research, demonstrated that a distributive generation penetration level of between 20% to 27% could be used to meet the electrical demands of a large metropolitan area. Following this level of DG penetration, the test system under single-outage conditions experienced rapid voltage decay similar to voltage collapse.; Contributions of this research are predominately in the field of electrical engineering and are focused on numerical modeling of power systems. Major contributions include: (1) Data collection and modeling of DG exceeds any previous attempts, due to at least in part to the availability of data and to computer limitations. (2) Development of an aggregated Universal Distributed Generation Feeder (UDGF) model for the distribution system is a new approach. Previous studies examined single distribution feeders as opposed to modeling the entire distribution and transmission system together. (3) Numerical valuation methods utilized in this research have not been previously used in this manner and represent a novel approach. This research used the point at which the load-flow Jacobian is singular to represent an undesirable operating point where system voltages collapse.; Groups interested in this research are bulk system planning engineers, power system operators, power system researchers, regulatory bodies and transmission system owners.