Publication
Multi-Loop Transient Stability Control via Power Modulation From Energy Storage Devices
Abstract
This paper presents an optimal transient-stability control strategy that modulates the real power injected and absorbed by distributed energy-storage devices. These devices are located at the high-voltage bus of several generators in a synchronous power system. The system is broken into areas based upon groupings of generators. The control strategy consists of two parallel feedback loops. One loop focuses on preserving the synchronism of the generator to its own area. The second loop focuses on preserving the synchronism of a given area to the other areas. Each control loop strategy is based upon local and center-of-inertia frequency measurements. The strategy is derived from two perspectives. With the first, the goal is to remove as much kinetic energy gained during a disturbance as quickly as possible before it is converted to potential energy. With the second perspective, an optimal transient control cost-function is minimized. Both perspectives result in the same strategy. The performance of the control strategy is evaluated on a four-machine power system model and on a 34-generator reduced-order model of the western North-American grid. The results show that this control approach significantly improves the transient stability of power systems.
AI Summary
This paper extends real-power modulation for transient-stability control into a coordinated multi-loop framework using distributed energy-storage devices. The control law is derived from both an energy-function interpretation and a minimum-time optimal-control formulation, leading to a practical strategy that absorbs or injects power based on generator and center-of-inertia frequency differences. One feedback loop keeps individual generators synchronized with their local area, while a second keeps coherent areas synchronized with the wider system. Tests on a four-machine system and a 34-generator reduced-order western North American system show that both the single-loop and multi-loop strategies improve critical clearing time and transient stability. The multi-loop approach provides additional benefit when groups of generators begin swinging against one another, directly addressing inter-area separation.
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