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.
Highlights
P OWER systems are subjected to a wide range of disturbances during daily operations
This paper presents an optimal transient-stability control strategy that modulates the real power injected and absorbed by energy storage systems (ESSs) located at the high-voltage bus of several generators in a synchronous power system
WORK In this paper, we developed and demonstrated an optimal control strategy that modulates the real power absorbed and injected by distributed energy storage devices in a synchronous power system
Summary
P OWER systems are subjected to a wide range of disturbances during daily operations. The ability of a power system to maintain synchronism during the few seconds after being subjected to a severe disturbance is known as transient stability [2]. The fast response times of many ESSs provide an opportunity to utilize them to enhance transient stability [6]–[8] All of these papers utilize frequency and/or angle feedback to modulate the ESS output power and are primarily focused on the stabilization of a given generator connected to the system. Use of a COI relative feedback signal assures that the control focuses on stability and not on frequency regulation. This paper presents an optimal transient-stability control strategy that modulates the real power injected and absorbed by ESSs located at the high-voltage bus of several generators in a synchronous power system. A combination of partial energy function and EAC is exploited
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