Synchrophasor Based Voltage Stability Monitoring And Control of Power Systems

Saugata Swapan Biswas

With increasing loads, change in generation mix, environmental limitations on transmission system expansion and high competition amongst the power utilities, power systems are being pushed to voltage stability limits, thus increasing the chances of a voltage collapse that can lead to a blackout. Numerous voltage instability incidents occurring around the world in recent years have emphasized voltage stability studies during planning and operation of power systems. With the advent of synchrophasor technology, improved algorithms can be developed utilizing phasor measurements to efficiently monitor the voltage stability condition of a power system, thus enabling fast online control. Objective of this research is to develop new real time voltage stability monitoring tools and a voltage stability control tool using synchrophasor data. The developed tools are computationally efficient and suitable for real time monitoring and control. The local phasor measurement based real time voltage stability monitoring tool has been developed for implementation at substation(s), while the wide area voltage stability monitoring and control tools have been developed for use by system operators at control centers. Although these tools have been designed to make use of Phasor Measurement Unit (PMU) data, they can also be implemented using State Estimator data obtained from Supervisory Control And Data Acquisition (SCADA), as well as PMU data integrated with SCADA data. The proposed wide area voltage stability monitoring algorithm non-iteratively computes the voltage stability margin (in the form of an index) for all load buses using a unique 'system-centric reduced network equivalent' approach. An important consideration in real time monitoring using synchrophasor technology is data quality and accuracy of PMUs. Thus, a new semi-automated tool has been proposed to make PMU testing easy, fast and accurate. The proposed wide area voltage stability control algorithm aims at solving a voltage stability problem using minimal switching of control resources in 'normal mode', and in minimal time in 'emergency mode', properly coordinating the available control resources in the system. The proposed monitoring and control algorithms have been tested offline and online on several IEEE test cases under different voltage stability conditions, and their results have been validated with established analytical tools.

Synchrophasor Based Voltage Stability Monitoring And Control of Power Systems

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