Development and validation of detailed controls models of the Nelson River Bipole 1 HVDC system

With the Nelson River Bipole 1 mercury arc valve group replacement project and planning for the expansion of the Nelson River HVDC system with a third bipole underway, it was decided to pursue a program to develop and validate detailed models of the existing HVDC transmission facilities and their associated AC systems for use in system studies. The first phase of the program concentrated on the development of detailed controls models associated with the Bipole 1 transmission facility. A rationale for the development of detailed models, the method used in developing models related to Bipole 1, results of validation tests, difficulties encountered during the process, and the overall benefits resulting from the project are presented. As an example, the models are used to investigate a low-frequency oscillation that has occurred on the DC system in the past