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This paper presents a study of the impact of severe generation imbalance on reactive power margins. In particular, the focus of the study is the analysis of characteristics of the reactive power margins under two common strategies A) generation redispatch and B) load shedding when a significant loss of generation occurs in a power system. Simulation results show that, at some buses, Strategy A may...
A hybrid simulation/measurement-based framework for online dynamic security assessment (DSA) is proposed in this work. It combines the strengths and features of simulation-based and measurement-based approaches to develop a tool that integrates the results and provides real-time situational awareness on available operating margins against major stability problems. High performance computing capability...
Power flow solvable boundary plays an important role in contingency analysis, security assessment, and planning processes. However, to construct the real solvable boundary in multidimensional parameter space is burdensome and time consuming. In this paper, we develop a new technique to approximate the solvable boundary of distribution systems based on Banach fixed point theorem. Not only the new technique...
This paper evaluates the effectiveness of reactive reserves provided by distributed energy resources to increase the loadability of a weak area of the Hellenic Interconnected System. The effect of static capacitor switching is compared to reactive support provided by electronic converters at the same substations. The investigation has been focused on a specific potentially unstable contingency of...
Voltage instability caused by integrating large-scale wind generation into a weak system is a well-known challenge. The ERCOT 2012 Long Term System Assessment report indicated that a voltage stability limit will constrain wind power delivery to the rest of the ERCOT system if the northwestern-most portion of the ERCOT Panhandle CREZ system becomes over-subscribed. To identify the system upgrades necessary...
Droop-controlled distributed generation (DG) units are widely used in microgrids for rural electrification applications. In these microgrids, power quality is vulnerable to voltage and frequency instabilities due to limited generation capacities of DG units. More importantly, droop-controlled rotational and electronic DG units have different frequency dynamics, making a comprehensive stability analysis...
To assess static voltage stability in power networks, critical load values were examined at each load bus as a voltage instability predictor. However, the information that is required to evaluate loadability conditions is usually not available at load buses. To predict impending voltage collapse in a droop-controlled power distribution network, this paper introduces a static voltage stability detector...
We use synchrophasor measurements of the complex voltage and current at both ends of multiple transmission lines that connect areas of a power system to monitor the online voltage collapse margin. A new reduction is used to reduce the multiple transmission lines to a single line equivalent and determine how to combine the synchrophasor measurements. Generator reactive power limits can be accommodated...
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