Voltage Stability Analysis of a Multiple-Infeed Load Center Using Phasor Measurement Data

Abstract

Abstract-Voltage stability is a security concern for modern power systems. It can be analyzed using detailed or equivalent models. In this paper a new approach is presented for voltage stability analysis using synchronized phasor measurement data. Simple equivalent models of the interconnected system and load side at a measurement point are estimated from the data, and then used for calculating PV curves and predicting the stability limit. Two different models are proposed, and compared based on the analyses performed on the event recordings from US Western Power System. Minimal modeling and formulation makes the method suitable for online calculations. The models are continuously updated to reflect the effects of different system components and changes.

Real-Time Reduced Steady-State Model Synthesis of Active Distribution Networks Using PMU Measurements

“…Steady state model synthesis of power system has been investigated in the past [5][6][7][8], mainly focusing on transmission systems where distribution networks represented by pure loads. The synthesized models, including only positive sequence networks, may not be used to represent unbalanced systems such as distribution networks.…”

“…The issue with these equivalents is that the physical behavior of the internal system is accurate whereas the behavior of the external system is approximated, hence limiting their ability to retain the characteristics of the entire system. The methods, proposed in [7] and [8], can use realtime PMU measurements, making them suitable for real-time applications; however, they are restricted to acquire PMU measurements from a single location, making them unable to synthesize models for multiple sections of power networks. Hence, there is clearly a need to develop a method that performs model synthesis in real-time for multiple sections of unbalanced distribution networks.…”

A short survey of methods for voltage instability detection

“…Two methods also relying on the Thévenin equivalent were presented in [21]. The first method relies on a single Thévenin equivalent, and uses the measurement samples to identify linear relationships between the active and reactive powers of loads; this is used to check a stability limit.…”

Voltage stability monitoring using sensitivities computed from synchronized phasor measurement data

“…Vertical and horizontal yellow and red dash-dot lines indicate the distance to the maximum power transfer (active power margin) for the dV i /dP ik thresholds that have been set by user. Determination of the PV and QV curves and P & Q margins for each bus can be carried out off-line through continuation studies, or on-line as proposed in [28]. All of these quantities can be updated dynamically as the data is processed and passed to the display for visualization.…”