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Interconnected power systems experienced a significant increase in size and complexity. It is computationally burdensome to represent the entire system in detail to conduct power system analysis. Therefore, the model of the study system must be retained in detail while the external system can be reduced using system reduction techniques. This paper proposes a measurement-based dynamic equivalent in...
Recent large penetrations of solar photovoltaic (PV) generation and the inertial characteristics of inverter-based generation technologies have caught the attention of those in the electric power industry in the United States. This paper presents a systematic approach to develop test cases of high penetrations of PV for the Western Interconnection. First, to examine the accuracy of the base case model,...
Wide-area-measurement systems (WAMSs) are used in smart grid systems to enable the efficient monitoring of grid dynamics. However, the overwhelming amount of data and the severe contamination from noise often impede the effective and efficient data analysis and storage of WAMS generated measurements. To solve this problem, we propose a novel framework that takes advantage of Multivariate Empirical...
Frequency monitoring network (FNET/GridEye), a wide-area monitoring system (WAMS) at distribution level, is known to be able to reveal many insights of power grid dynamics through the real time phasor measurement collected by frequency disturbance recorders (FDRs). A large number of FDR units are currently deployed in several power grids worldwide. This paper focuses on the inertial frequency responses...
The paper presents two groups of measurement based multi-inputs, multi-outputs (MIMO) system identification approaches, which are subspace state-space identification and transfer function identification. The purpose is to compare the performance and features of these methods in terms of electromechanical oscillation damping estimation. The selected methods are validated by using ambient data and ring-down...
Due to its economical and environmental benefits to society and industry, integrating solar power is continuously growing in many utilities and Independent System Operators (ISOs). However, the intermittent nature of the renewable energy brings new challenges to the system operators. One key to resolve this problem is to have a ubiquitously efficient solar power output forecasting system, so as to...
Inter-area oscillation in a large power systems draws much attention because it might severely influence system security and reduce transmission capability. The recent large-scale deployment of phasor measurement units (PMUs) enables online measurement-based monitoring and analysis on inter-area oscillatory modes. However, the nonstationary characteristics of measurements become obstacles for oscillation...
One of the main drawbacks of the existing wide-area damping controller (WADC) that are usually tuned based on several selected typical operating conditions, is its limited adaptability to continuous variations in operating conditions. An adaptive WADC employing the lead-lag structure using measurement-driven model is proposed in this paper. The state subspace model is identified online using ambient...
The power system is a typical complex and nonlinear system in nature. Theoretically, the nonlinear approach can describe a dynamic system more accurately than a linear approach, but to an actual power grid, a linear approach was usually used to model a nonlinear problem approximately. To investigate when the system can be linearized and “how small is small” to linearize the system accurately, this...
This paper studies the impact of wind generation on generator rotor angle and inter-area oscillation stability. A comparative simulation study is conducted based on a U.S. Eastern Interconnection (EI) planning model for year 2030. The wind penetration level is 17% of the total generation. Generator critical clearing time (CCT) and inter-area oscillation damping ratio are evaluated. It is observed...
One of the main drawbacks of the existing oscillation damping controllers is that they are designed based on offline simulations for assumed system conditions and are not adaptive to the varying power system operating conditions. With the increasing availability of wide-area measurements and the rapid development of system identification techniques, adaptive oscillation damping controllers can be...
With the increasing size and complexity of the power grid, wide-area measurement system (WAMS) has been studied and implemented more widely. As a pioneering WAMS deployed at the distribution level, the frequency monitoring network FNET/GridEye has been providing independent observation of dynamic performance of U.S. and other worldwide power grids continuously since 2004. By utilizing GPS-time-synchronized...
With the constantly changing power system topology and operation status, it is not yet feasible to update full power system simulation models in real time. Furthermore, the accuracy of models for dynamic simulation is a concern. In the large-scale power system dynamic simulation, usually only the dynamics of a local system need to be studied while external systems can be reduced. Thus, dynamic equivalencing...
This paper documents a dynamic simulation study of inertial response on the U.S. Eastern Interconnection (EI) in the year 2030. The 2030 EI model features 17% wind penetration, which is mainly located in the Midcontinent Independent System Operator (MISO) and the Southwest Power Pool (SPP) territories. This comparison study looks at the difference in system wide inertial responses between wind and...
In order to improve the capability of utilizing big data and business intelligence in the power industry, this paper presents a comprehensive solution through building an enterprise-level data platform based on the OSIsoft PI system to support big data driven applications and analytics. The platform has the features of scalability, real time, service-oriented architecture and high reliability. Compared...
The Electric Network Frequency (ENF) analysis of a digital recording is a two-step process. First, an ENF extraction algorithm is applied to the recording and the second step is comparing the extracted target sequence to subsequences contained in a grid reference database. In this paper, a new comparison algorithm is created that can remove the effects of oscillator errors from comparisons. Another...
Wide area measurement systems (WAMS) could provide enough information to estimate the electromechanical modes which characterize the dynamic properties of the power grid. Utilizing the measured synchrophasor data from frequency monitoring network (FNET/GridEye), this paper proposes an approach to estimate the oscillation frequency and damping regardless of ring-down or ambient condition in real-time...
Wide-area measurement systems enable the wide-area damping controller (WADC) to use remote signals to enhance the small signal stability of large scale interconnected power systems. Due to the global properties, conventional control input-output selection approach based on the detailed mathematical models are not available for the complicated systems. A new measurement-based damping control input-...
Accurate event analysis in real time is of paramount importance for high-fidelity situational awareness such that proper actions can take place before any isolated faults escalate to cascading blackouts. For large-scale power systems, due to the large intra-class variance and inter-class similarity, the nonlinear nature of the system, and the large dynamic range of the event scale, multi-event analysis...
The operation and control of power grids will increasingly rely on data. A high-speed, reliable, flexible and secure data architecture is the prerequisite of the next-generation power grid. This paper summarizes the challenges in collecting and utilizing power grid data, and then provides reference data architecture for future power grids. Based on the data architecture deployment, related research...
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