The Experts below are selected from a list of 8670 Experts worldwide ranked by ideXlab platform
Jean Mahseredjian - One of the best experts on this subject based on the ideXlab platform.
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Field validation of generic wind park models using fault records
Journal of Modern Power Systems and Clean Energy, 2019Co-Authors: Aboutaleb Haddadi, Ulas Karaagac, Evangelos Farantatos, Thomas Kauffmann, Ilhan Kocar, Jean MahseredjianAbstract:A challenge faced by protection and planning engineers is the development and validation of accurate wind turbine generator (WTG) models to study the impact of increased wind integration on system protection. This paper is on the experimental validation of a generic electromagnetic transient-type (EMT-type) model of aggregated WTGs or wind parks suitable for transient studies. The Phasor Domain equivalent of the generic model, suitable for protection tools based on steady-state solvers, is also considered. The model has been validated using two sets of actual relay records for the fault response of two wind parks consisting of Type-III WTGs and connected to 115 kV and 230 kV transmission systems. The objective is to show that the generic model can reproduce the actual fault response in simulations, and protection engineers can obtain accurate models of wind parks using fault records. A distinctive characteristic of a WTG is its substantially different negative sequence fault current contribution compared to a synchronous generator. The paper shows that the generic model provides enough options to reproduce the negative sequence behavior and hence is suitable for fault studies involving negative sequence-based protection.
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Phasor Domain modeling of type iii wind turbine generator for protection studies
Power and Energy Society General Meeting, 2015Co-Authors: Thomas Kauffmann, Ulas Karaagac, Ilhan Kocar, Jean Mahseredjian, Henry Gras, Baki Cetindag, Evangelos FarantatosAbstract:The integration level of renewable energy resources has been continuously increasing in recent years introducing several technical challenges for utility and Independent System Operator (ISO) protection and planning engineers. One major challenge is related to the development of reliable models for system protection studies and accurate evaluation of their short circuit contributions. Converter interfaced wind turbines produce significantly different current waveform signatures compared to the traditional synchronous or asynchronous generators. This paper proposes a new Phasor Domain modeling approach for Type III wind turbines (WTs) with doubly-fed induction generators (DFIGs), that considers the impact of DFIG control.
Alessandro Astolfi - One of the best experts on this subject based on the ideXlab platform.
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moment based discontinuous Phasor transform and its application to the steady state analysis of inverters and wireless power transfer systems
IEEE Transactions on Power Electronics, 2016Co-Authors: Giordano Scarciotti, Alessandro AstolfiAbstract:Power electronic devices are inherently discontinuous systems. Square waves, produced by interconnected transistors, are commonly used to control inverters. This paper proposes a novel Phasor transform, based on the theory of moments, which allows to analyze the steady-state behavior of discontinuous power electronic devices in closed-form, i.e. , without approximations. In the first part of this paper, it is shown that the Phasors of an electric circuit are the moments on the imaginary axis of the linear system describing the circuit. Exploiting this observation, in the second part of this paper, we focus on the analysis of circuits powered by discontinuous sources. The new “discontinuous Phasor transform” is defined and the $ v$ – $ i$ characteristics for inductors, capacitors, and resistors are described in terms of this new Phasor transform. Since the new quantities maintain their physical meaning, the instantaneous power and average power can be computed in the Phasor Domain. The analytic potential of the new tool is illustrated studying the steady-state response of power inverters and of wireless power transfer systems with non-ideal switches.
Giordano Scarciotti - One of the best experts on this subject based on the ideXlab platform.
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moment based discontinuous Phasor transform and its application to the steady state analysis of inverters and wireless power transfer systems
IEEE Transactions on Power Electronics, 2016Co-Authors: Giordano Scarciotti, Alessandro AstolfiAbstract:Power electronic devices are inherently discontinuous systems. Square waves, produced by interconnected transistors, are commonly used to control inverters. This paper proposes a novel Phasor transform, based on the theory of moments, which allows to analyze the steady-state behavior of discontinuous power electronic devices in closed-form, i.e. , without approximations. In the first part of this paper, it is shown that the Phasors of an electric circuit are the moments on the imaginary axis of the linear system describing the circuit. Exploiting this observation, in the second part of this paper, we focus on the analysis of circuits powered by discontinuous sources. The new “discontinuous Phasor transform” is defined and the $ v$ – $ i$ characteristics for inductors, capacitors, and resistors are described in terms of this new Phasor transform. Since the new quantities maintain their physical meaning, the instantaneous power and average power can be computed in the Phasor Domain. The analytic potential of the new tool is illustrated studying the steady-state response of power inverters and of wireless power transfer systems with non-ideal switches.
Nengling Tai - One of the best experts on this subject based on the ideXlab platform.
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a multi rate co simulation of combined Phasor Domain and time Domain models for large scale wind farms
IEEE Transactions on Energy Conversion, 2020Co-Authors: Dewu Shu, Fan Shi, Zheng Yan, Yiying Zhu, Nengling TaiAbstract:In the year 2015-2018, there are many sub- and super-synchronous interaction (S $^2$ SI) events, happened in China. However, traditional transient stability models, electro-magnetic transient (EMT) models and hybrid TS and EMT simulation methods fail to capture the desired wide frequency band interactions between large-scale AC grids and wind farms. To accurately and efficiently capture wide frequency band interactions between AC grids and wind farms, a simulation method which can extend the time-step to 500 $\mu$ s and further adopt the multi-rate structure is highly required. For this objective, we propose a multi-rate co-simulation method, in which the target system is partitioned into electro-magnetic transient (EMT) and shifted frequency Phasor (SFP) subsystems, represented by our proposed transformation based SFP models and the traditional EMT models, respectively. The simulation efficiency of simulating large-scale AC grids is significantly improved by adopting a much larger time-step. Further, the multi-rate multi-Domain transmission-line model (MD-TLM) and the multi-rate frequency dependent MD-TLM are respectively proposed to reflect wide-band interactions between AC grids and wind farms. Eventually, the multi-rate co-simulation is implemented based on the efficient SFP models, network partitioning, and so-called the multi-rate (FD)-MD-TLM. The performance (efficiency and accuracy) of the proposed method has been fully validated on a practical system integrating large AC grids and wind farms.
Igor Simone Stievano - One of the best experts on this subject based on the ideXlab platform.
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an iterative scheme for the power flow analysis of distribution networks based on decoupled circuit equivalents in the Phasor Domain
Energies, 2020Co-Authors: Zain Anwer Memon, Riccardo Trinchero, Yanzhao Xie, Flavio Canavero, Igor Simone StievanoAbstract:This paper presents an alternative solution for the power-flow analysis of power systems with distributed generation provided by heterogeneous sources. The proposed simulation approach relies on a suitable interpretation of the power network in terms of a nonlinear circuit in the Phasor Domain. The above circuit interpretation can be solved directly in the frequency-Domain via the combination of a standard tool for circuit analysis with an iterative numerical scheme, providing directly the steady-state solution of the power-flow of a generic distribution network. At each iteration, the resulting circuit turns out to be composed by two decoupled subnetworks, a large linear part and a set of smaller nonlinear pieces accounting for the load characteristics, with evident benefits in terms of the computational time. The feasibility and strength of the proposed simulation scheme have been verified on a large benchmark consisting of the IEEE 8500-node test feeder. Then it is applied to the statistical simulation of a power network accounting for the variability effects of renewable generators. According to the results, the proposed tool provides an effective alternative to the state-of-the-art approaches for power-flow analysis further highlighting the benefits of the application of well-established tools for circuit analysis to power-flow problems.