Innovative network response-based special protection scheme for imminent loss of synchronism detection with surge arrester protection and energy monitoring functions

摘要

Hydro-Quebec has identified Special Protection Systems (SPSs) as a key element in the evolution of its defense plan in order to maintain its performance and meet the design criteria of its future network. In this context, an innovative project for a new SPS development was initiated. This new system, which is the last line of the defense plan, is required to avoid serious damage to strategic transmission devices. Specifically, it is dedicated to protect critical transmission equipment against overvoltage in case of an imminent loss of synchronism. The result of this successful project is the so-called special protection scheme 《Relais de Perte de Synchronisme》 (RPS). Its algorithm uses three-phase voltage and current local measurements at the substation where it is connected in order to obtain a robust solution with respect to telecommunications related problems. Moreover, the new system provides the decision signal by analyzing the network response to an event instead of an approach based on topology change analysis. In addition to the detection function, this SPS also includes dedicated surge arrester protection and energy monitoring functions. This innovative SPS algorithm developed in Matlab/Simulink has been intensively tested on PSSE and EMTP simulations, while the hardware integration solution was tested using Hydro-Quebec's Hypersim real-time simulator on a test bench replicating the typical on-site installation and meeting all substation standards and protocols. Field tests of the RPS solution were conducted at a major 735kV substation and a first implementation was successfully completed.