This paper describes the on‐going work done by Hydro‐Québec to optimize the settings of automatic devices installed in its main power plants to maintain secure operation under extreme contingencies. The automatic generator tripping and load shedding system (RPTC) described in this paper is installed at the Churchill Falls hydroelectric power plant (5,500 MW) in Labrador. Data mining techniques such as decision trees and regression trees have been used. Real time snapshots of the Hydro‐Québec power system collected over a 5 year period have been used to generate large amounts of results by transient stability simulations. The processing of these data has been done using software developed by the University of Liege. This approach gives the most relevant parameters and finds optimal settings for the RPTC system, minimizing the number of tripped generator units while maintaining the same performance in terms of security coverage. New operation rules can thus be established.
Grid Forming (GFM) converters are changing the way that power converters interact with the network to resemble synchronous machines (SM). Several GFM technologies including the Synchronverter, a particular member of Virtual Synchronous Machine (VSM), and GFM droop, based on standard current control and droop, have been suggested. The controllers have been compared and found to be equivalent to each other in steady state. The equivalence generally focusses on individual operating conditions and fails to address differences in dynamic properties. This paper provides a clear tuning guide of both controls in terms of SM properties and a discussion of the analytical equivalence using the output of time-domain medium-voltage DC (MVDC) converter models. Initially, the GFM droop is found to be less damped despite the equivalent tuning in terms of damping ratio. A parametric sweep of the cascaded control present within the GFM droop finds that the Voltage Control bandwidth and proportional gain can be tuned to adjust the damping of the response. The Voltage Control parameters are also found to affect the GFM droop's stability.
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