ADAPTIVE REMEDIAL ACTION SCHEMES USING SYNCHROPHASORS

Krishnanjan Gubba Ravikumar

With the advent of synchrophasor technology, the possibility of advanced power system monitoring and control has been widely expanded and explored. The technology has not only provided the path for inventing novel analysis algorithms but also has shown great potential for developing mitigation and control schemes such as synchrophasor-based remedial action schemes and system integrity protection schemes. A remedial action scheme (RAS) provides a highly dependable and rigorous platform to be able to protect the power system from stability and integrity issues. However, there has been a clear need for not only improving the power system stability and reliability, but also to enhance the grid resiliency to withstand numerous cyber and physical vulnerabilities. The overall goal of this work is to contribute towards the improvement of power system reliability, stability, security and resiliency. The objective of this work was to develop RAS control methodologies for improving power system stability and resiliency using technologies such as synchrophasors and real-time monitoring systems. The proposed settingless synchrophasor-based algorithm detects open line condition in high speed to reliably assist with time-critical RASs. Analysis and quantification of the impact of communication networks on RAS performance has been studied. This allows for understanding the critical role played by communication networks in power system control applications. A distributed RAS architecture was proposed to overcome the limitations observed in centralized architectures. RAS subclassification was also proposed based on DC and AC Optimal Power Flow (OPF) methods. With the aim to improve power system resiliency, distributed optimization techniques have been explored to formulate and implement optimization techniques for performing distributed AC OPF. Distributed AC OPF was applied to study the problem of transmission line overload conditions caused due to excessive wind generation. The work also investigated the application of an AC OPF RAS to a fault-induced delayed voltage recovery (FIDVR) problem and proposed a control methodology for detection and mitigation of slow voltage recovery on transmission system. Last\\ but not the least, the proposed distributed AC OPF method was quantified using resiliency metrics to understand the overall improvement in power system resiliency.

ADAPTIVE REMEDIAL ACTION SCHEMES USING SYNCHROPHASORS

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