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Nowadays, most substations are equipped with Intelligent Electronic Devices (IEDs) performing data collection. With the advancement of measurement techniques and growing availability of information captured by newly emerged IEDs such as Phasor Measurement Units (PMUs), it is imperative to integrate the various data sources with traditional Supervisory Control and Data Acquisition (SCADA)/Energy Management...
The stability of electrical transmission networks has been receiving more attention in recent years all over the world. Following several wide-area supply interruptions, so called blackouts, for example in Europe and North America, it is widely accepted that transmission networks have to be improved in terms of both capacity and stability. The quick building of new lines is usually not an option,...
It is critically important for improving the wide area situation awareness of the operators or operational engineers and regional reliability coordinators of a large interconnected systems to prevent large scale cascading system outages. This paper describes an advanced wide-area power system visualization application (WAPSVA) for the real-time reliability monitoring using real-time synchrophasor...
Smart Grid initiatives proposed by governments and industry organizations have the potential to support carbon mandates/targets. While the options and scope of the changes that might be deployed within the transmission and distribution system to respond to climate change initiatives, is not yet defined they options could include bi-directional power flow, the increased use of distributed variable...
The inter-area oscillations occurring in the Eastern Interconnection (EI) are investigated by six typical cases using the FNET data. The matrix pencil method of multiple signals is used for the modal analysis. The parameters related to mode shape are calculated. The mode shapes for the dominant mode are revealed for each case. Analysis results depict a view of inter-area mode distribution in the Eastern...
The high rate of data samples reported by devices that support PMU functionality forces the use of non-traditional methods in order to attempt realtime anomaly detection. Two methods discussed are offline machine learning and a realtime sliding window procedure. In using machine learning techniques it is possible to assert a classifier algorithm, which to a certain degree of accuracy can flag incoming...
In this paper we address the problem of placing Phasor Measurement Units (PMUs) on a long transmission line connecting two areas of a power system network. Dynamic measurements of electrical signals such as magnitudes and phases of bus voltages and line currents, corrupted with Gaussian noise, are available from these PMUs. Our objective is to determine the best locations for their placement such...
Summary form only given:Latency or delay in remote feedback signals can adversely affect the closed-loop damping performance. Accurate time-stamp information at both (PMU location and control center) ends offers a possibility to continuously compensate for time-varying latency. In this paper, an adaptive phasor power oscillation damping controller (APPOD) is proposed wherein the rotating coordinates...
This paper illustrates a new technique that identifies coherent clusters of synchronous generators in multi-machine power systems. The technique can be easily implemented in a wide-area measurement system. The importance of fast identification of coherent groups of generators based on wide-area signal measurements lies in its contribution to the design of wide-area based stability control schemes...
This paper is motivated by the need to automate adjustments of deviations in key output variables from their scheduled values. In particular, it is important to maintain load voltages within their pre-specified limits in response to many disturbances, for example load power factor deviations. Similarly, it is important to regulate real power line flows to within their pre-specified limits as disturbances...
Synchronized measurements technology plays a vital role in the deployment of the Smart Grid at transmission level by revolutionizing the way power systems are operated and controlled. Utilizing very precise time reference enabled by the GPS system allows for measurement synchronization and ultimately optimizes the management of power network behavior and performance. This paper presents SRP experience...
The paper proposes a systematic scheme for building compact and transparent fuzzy rule-based classifiers for rapid stability assessment; the classifiers are initialized by large accurate decision trees (DTs). The approach starts by selecting strategic monitoring buses where phasor measurement units (PMUs) are placed to capture wide-area response signals in real-time operation. These measurements are...
Monitoring of some of the effects of wind power on the transmission grid is possible from 120 V wall outlet measurements. The penetration levels of wind power are reflected in synchronized phasor measurements taken by the independent synchrophasor network located at the University of Texas at Austin. The independent synchrophasor network is unique because it takes single-phase synchronized voltage...
This paper proposes a method based on noise space decomposition (NSD) for the identification of low frequency oscillations in power systems. The proposed method uses a median filter to reduce the variance of the estimated modes. The signal utilized for estimating the modes is the power signal obtained from phasor measurement units (PMUs). The results with the proposed method has been compared with...
The electric power grid is a highly complex system with unique challenges for ensuring safety and reliability of operations. The high degree of interconnectivity and dynamics of loads, sources, and lines has introduced vulnerability. These challenges include such factors as - aging infrastructure, transmission expansion to meet growing demands, distributed resources, congestion management, reliability...
In this paper we present several new results on how to construct simplified inter-area models of large power networks by using dynamic measurements available from phasor measurement units (PMUs) installed at specific points on the transmission line. Our example of study in this paper is a widely encountered realistic system, namely the Pacific AC intertie, which closely resembles a star-connected...
Summary form only given. This paper proposes a regularized robust recursive least squares (R3LS) method for on-line estimation of power-system electromechanical modes based on synchronized phasor measurement unit (PMU) data. The proposed method utilizes an autoregressive moving average exogenous (ARMAX) model to account for typical measurement data, which includes low-level pseudo-random probing,...
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