He introduced the dQ/dV index. A small change in reactive power (Q) causing a large change in Voltage (V) indicates proximity to collapse. When dQ/dV turns negative, collapse is imminent.
Introduction: The Silent Threat to Modern Power Grids In the world of electrical engineering, the term "stability" often conjures images of rotor angles swinging and generators losing synchronism. However, there is a quieter, more insidious threat that has led to some of the largest blackouts in history: Voltage Instability . power system voltage stability carson w taylor pdf free
Generators cannot supply infinite reactive power. When a generator hits its field current limit (stator or rotor), it converts from a voltage source to a constant current source. Taylor mapped exactly how this "limit" transition collapses margins. He introduced the dQ/dV index
But there is a catch. The book has been out of print for years. Used copies on Amazon often start at $300. This has led thousands of engineers to search for the elusive Introduction: The Silent Threat to Modern Power Grids