Abstract
Transient stability is highly correlated to the inertia connected to the synchronous grid. Most of the modern control schemes for maintaining transient stability involve generator tripping schemes. However, these type of schemes may become difficult to implement because of the inertia reduction associated with the increase in inverter-based and distributed generation. This paper presents the effect of using machine acceleration feedback in a real-power injection control scheme to improve transient stability without generator tripping. This scheme is based on the equal area criterion and tested on a one machine infinite bus and a two machine system. Its applicability in a multimachine power system is demonstrated on a reduced-order western North American power system. Simulation results indicate that the proposed control strategy provides a simple and effective method for improving transient stability.
AI Summary
This paper develops a feedback control strategy for improving transient stability without relying on generator tripping. Using the equal-area criterion as the physical basis, the controller modulates real-power injection or absorption near a generator in response to its acceleration so that excess kinetic energy gained during a disturbance is removed more quickly. The approach is first demonstrated on one-machine-infinite-bus and two-machine systems, then applied to a reduced-order model of the western North American power system. Across the test cases, the control action reduces rotor-speed separation and improves post-fault synchronism, showing that fast real-power modulation can provide an alternative mechanism for transient-stability support.
Full Paper
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