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In this letter, a power-quality measurement network for the power system is proposed to integrate electric measurement units with the Internet, global positioning system (GPS), and Linux, Apache, MySQL, PHP (LAMP). A synchronized sensor network is formed to monitor the system's dynamics in a wide-area sense. CompactRIO by National Instruments is used as measurement units to capture voltage at the...
Power transmission systems of today are operating closer to their limit. In the event of a developing blackout, the disconnection of loads under controlled conditions can maintain system's stability. Undervoltage load shedding (UVLS) is an economical solution to the voltage stability problem, and provides protection for unusual disturbances outside the planning and operating criteria. In this paper,...
For power system, Thevenin equivalent at a node can represent the aggregation of systempsilas operation conditions, e.g. generator terminal voltages, load powers, and line impedances, seen from a bus. estimation of Thevenin equivalent can be challenging given that active controls in power systems vary the systempsilas states with time. Traditional Thevenin equivalent method using open-circuit and...
This paper investigates reactive power compensation strategies to mitigate voltage quality problem in power system such as flicker, sag, swell and unbalance. We choose to utilize STATCOM (Synchronous static compensator), which encompasses advantages including, but not limit to, rapid response time and the ability to provide reactive power at low voltage, and to provide voltage compensation. Based...
Frequency is an important parameter in understanding the operation of power systems. Dynamic visualization of frequency measurements provides a quick and direct way to view the state of the system. Tools are being developed to help observe frequency behavior from both simulations and real-time field measurements. Frequency replay from simulation data provides some insights of how the frequency electromechanical...
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