NERC TPL-001-4 transient voltage performance compliance study - criteria development, study methodology and case studies

This paper presents a transient voltage performance compliance study to demonstrate compliance with section R5 of the new NERC TPL-001-4 Transmission System Planning Performance Requirements, which is set to be effective on January 1, 2016. The study focused on the Michigan Lower Peninsula area transmission system, owned By ITC Holdings Corp. First, an extensive investigation of dynamic voltage performance criteria currently implemented in various transmission entities was conducted. Based on this investigation, appropriate dynamic voltage performance criteria were proposed for testing and implementation in the study. Next, a study methodology was proposed, tested, and implemented in the ITC transmission system that included automatic contingency ranking and screening assessment, selection of voltage critical contingencies/locations, load modeling, and voltage stability analysis. Then, dynamic simulations were performed for a selected set of the critical voltage disturbances for multiple system load and generation dispatch scenarios and the system voltage responses were evaluated against the proposed dynamic voltage performance criteria. The simulations indicated that the system is transiently stable and meets the proposed dynamic voltage performance criteria for all the critical disturbances and system scenarios simulated. Finally, study guidelines were recommended for periodical future evaluation of the transient voltage performance of the ITC transmission system with appropriate dynamic voltage performance criteria. This study provides a basis to establish R5 compliance with the new NERC TPL-001-4 Transmission System Planning Performance Requirements for the ITC transmission system. The study also serves a useful reference for other transmission systems in compliance with requirement R5.