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Real-time Electromagnetic and Transient Stability Simulations for Active Distribution Networks
2013
This paper presents the solutions of a real-time parallel-processing based simulator, eMEGAsim, to perform electromagnetic transient and transient stability simulations for distribution power networks. The electromagnetic transient simulation can be distributed into several processors without adding an artificial delay, and the transient stability simulation tool can model three-phase unbalance systems. The simulator provides a flexible environment to interface discrete-time and phasor domains to create a hybrid simulation. HE distribution power systems were traditionally considered as passive networks that only involved end- users and loads. The simple topology of these systems and the utilization of cables instead of overhead lines made it less sensitive to transient stability phenomena. Distribution systems are usually coupled in a common bus with a strong transmission system. Therefore, disturbances such as short circuits in distribution networks were considered as localized phe...
On a new approach for the simulation of transients in power systems
Electric Power Systems Research, 2007
This paper presents a new simulation tool named EMTP-RV. EMTP-RV is a completely new program with a new graphical user interface and a new computational engine. The simulation uses a new matrix formulation for computing loadflow, steady-state and time-domain solutions. Theoretical advantages are emphasized and demonstrated through practical examples. An open-architecture graphical user interface (GUI) is developed to maximize flexibility and allow creating and maintaining complex designs.
Review of Methods to Accelerate Electromagnetic Transient Simulation of Power Systems
IEEE Access
Converter-based generators are increasingly replacing classical synchronous generation, resulting in significant challenges to the operation and planning of modern power systems. Power electronics (PE)-based equipment, along with non-linear PE-driven loads, introduce time-varying characteristics and fast switching behavior that increases the complexity of the power system model. Faster control actions are needed to overcome the fast switching dynamics to ensure the reliability and stability of future power systems. Thus, this requires advanced and detailed simulation methods and tools with highly accurate equivalent models to embody the relatively slower electromechanical to faster electromagnetic transient (EMT) phenomena. Conventional transient stability analysis using positive-sequence simulators has become inadequate for representing converter-dominated power systems, while EMT simulators suffer from the high computational burden. This review paper presents accelerated EMT simulation methods and tools that are categorized and discussed in three topics: system equivalents, simulation methods, and accelerating tools. Dynamic system equivalent techniques are discussed to model small to large interconnected external systems of the grid network. Moreover, a systematic review is made for existing EMT simulation methods, along with advanced co-simulation methods, for addressing simulation speed and accuracy issues in large power system networks. Emerging hardware-based simulation tools are reviewed that reduce the computational burden and increase the simulation efficiency of the power system model. Challenges and trends in EMT simulation are also presented and concluded by providing perspectives on this research topic.
Transient Modeling of a Full-Scale Distribution System: Comparison with Field Data
Journal of Water Resources Planning and Management, 2011
The usefulness of transient models depends on their predictive ability. Consequently, their results should ideally be validated with field data. Despite numerous theoretical developments in the area of surge analysis, comparisons between field and modeled data for large distribution systems (DSs) are scarce. Transient low-pressure events at a water treatment plant (WTP) resulted in negative pressures at numerous locations in the DS. Three distinct surge events were measured in a full-scale DS and modeled with transient analysis software. The simulated pressure profiles were compared with field data collected from 9-12 sites within the DS. The objective was to apply a commercial transient analysis algorithm to a large and detailed network model (≈15;000 nodes=pipes) to estimate transient pressure variations within the network. Results showed similar trends for the three low-pressure events analyzed: the modeled pressures matched reasonably well with the measured pressures, as long as they remained positive. Whenever the pressures reached negative values, the simulated amplitude was larger than that of the recorded pressures. Modeling parameters and factors that might explain such results were tentatively investigated. The importance of field data in understanding and confirming the model outputs is highlighted.
IEEE Transactions on Power Systems, 2016
This paper presents a new method for studying electromechanical transients in power systems using three phase, combined transmission and distribution models (hybrid models). The methodology models individual phases of an electric network and associated unbalance in load and generation. Therefore, the impacts of load unbalance, single phase distributed generation and line impedance unbalance on electromechanical transients can be studied without using electromagnetic transient simulation (EMTP) programs. The implementation of this methodology in software is called the Three Phase Dynamics Analyzer (TPDA). Case studies included in the paper demonstrate the accuracy of TPDA and its ability to simulate electromechanical transients in hybrid models. TPDA has the potential for providing electric utilities and power system planners with more accurate assessment of system stability than traditional dynamic simulation software that assume balanced network topology.
IEEE Transactions on Power Delivery, 1989
A time domain model will be described for predicting transient bus currents, electromagnetic fields, and cable coupling effects caused by switching actions in high voltage substations. Having been validated against measured transient data, the model provides a basis for predicting EM1 effects resulting from abnormal switching actions, such as phase to ground faults, which are difficult to stage for measurement. From such worst case estimates, the adequacy of neu-generation, microprocessor-controlled substation protection standards can be assessed.
The use of electric circuit simulation for power grid dynamics
Proceedings of the 2011 American Control Conference, 2011
Traditional grid models for large-scale simulations assume linear and quasi-static behavior allowing very simple models of the systems. In this paper, a scalable electric circuit simulation capability is presented that can capture a significantly higher degree of fidelity including transient dynamic behavior of the grid as well as allowing scaling to a regional and national level grid. A test case presented uses simple models, e.g. generators, transformers, transmission lines, and loads, but with the scalability feature it can be extended to include more advanced non-linear detailed models. The use of this scalable electric circuit simulator will provide the ability to conduct large-scale transient stability analysis as well as grid level planning as the grid evolves with greater degrees of penetration of renewables, power electronics, storage, distributed generation, and micro-grids.
Real-time methods for power-transmission networks simulation
ICDS '95. First International Conference on Digital Power System Simulators, 1995
This paper uses a new approach to the calculation of electromagnetic transients on transmission lines. The model is simple and well adapted to predict overvoltages and overcurrents. It takes into account initial conditions and sudden changes in the network configuration. This semi-analytical model gives immediate monitoring of the system's evolution. Starting from the real-time general concepts, reduction methods are applied to our model. The first level is partitioning and parallel processing. The second is the approximation of the characteristic impedance and the exponential propagation function. To reduce complexity and decrease execution time, Pad6 approximation is used.Transients responses of lossy transmission lines are simulated and a comparison between the proposed model and the EMTP model is carried out.