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dynamic phasor Modeling and Low-frequency Oscillation Analysis of Single-phase Vehicle-grid System

CSEE Journal of Power and Energy Systems 2023年第1期9卷 158-171页

作者： Xiaoqin Lyu Xiaoru Wang Yulong Che Longyuan Li School of Electrical Engineering Southwest Jiaotong UniversityChengdu 610031China

In practical operations,low-frequency oscillation(LFO)occurs and leads to converter blocking when multiple electrical rail vehicles at the platform are powered by the traction *** paper proposes a small-signal model in state-space form for multiple vehicle-grid systems based on a dynamic *** model uses the phasor amplitude and phase as variables to accurately describe the dynamics of the converter phase-domain *** eigenvalue based-method is introduced to investigate the LFO with advantages of acquiring all oscillatory modes and analyzing participation *** low-frequency dominant modes are identified by *** shape reveals that one of the modes involves the oscillations between the grid-connected converters and the traction network,and the other one involves the oscillations among these *** the sensitivities of these two low-frequency modes to different system parameters are *** factors of system state variables,when the number of connected vehicle increases,are ***,the theoretical analysis is verified by nonlinear time-domain simulations and the modal analysis based on the estimation of signal parameters via the rotational invariance techniques(ESPRIT)method.

关键词： dynamic phasor eigenvalue analysis electrical railway grid-connected converter low-frequency oscillation participation factors

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dynamic phasor-based hybrid simulation for multi-inverter grid-connected system

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Global Energy Interconnection 2023年第2期6卷 197-204页

作者： Peng Yang Qian Li Junyu Zhao Juanjuan Lu Yunfei Xu State Grid Hebei Electric Power Co.Ltd. Shijiazhuang 050021P.R.China State Grid Baoding Power Supply Company Baoding 071051P.R.China State Grid Smart Grid Research Institute Co.Ltd. Beijing 102200P.R.China

To realize the efficient transient simulation of a grid-connected power generation system based on multiple inverters, this paper proposes a hybrid simulation method integrating the models of electromagnetic transient and dynamic phasors. Based on a demonstration of the concepts and properties of dynamic phasors, the models of single-phase and three-phase inverters described by dynamic phasors are established first. Considering the numerical compatibility problem between dynamic phasors and instantaneous values, an interface scheme between dynamic phasors and instantaneous values is designed, and the efficiency and precision differences of various transformation methods are compared in ***, by utilizing MATLAB/Simulink, a hybrid simulation platform of a multi-inverter grid-connected system is built, and the efficiency and accuracy of the hybrid simulation are validated via comparison with the full electromagnetic transient simulation.

关键词： Multi-inverter grid-connected system Electromagnetic transient dynamic phasor Hybrid simulation

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Least square and Kalman based methods for dynamic phasor estimation:a review

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Protection and Control of Modern Power Systems 2017年第1期2卷 1-18页

作者： Jalal Khodaparast Mojtaba Khederzadeh Electrical and Computer Engineering Department Shahid Beheshti UniversityTehran 165895371Iran

The characterization of sinusoidal signals with time varying amplitude and phase is useful and applicable for many *** several algorithms have been suggested to estimate main aspects of these *** no standard approach to test the properties of these algorithms,it seems to be helpful to discuss a large class of algorithms according to their *** this paper,six methods of estimating dynamic phasor have been reviewed and discussed which three of them are based on least square and others are based on Kalman *** expansion is used as a first step and continued with least square or Kalman filter in accordance with the proposal observer of each *** theoretical processes of these methods are briefly *** characterizations have been made by some tests in time and frequency *** tests include amplitude step,phase step,frequency step,frequency response,total vector error,transient monitor,noise,sample number,computation time,harmonic and DC offset which build a framework to compare the different methods.

关键词： PMU dynamic phasor Kalman filter Taylor series Least square

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Improved State-space Modelling for Microgrids Without Virtual Resistances

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 584-596页

作者： Paranagamage S.A.Peiris Shaahin Filizadeh Dharshana Muthumuni Department of Electrical and Computer Engineering University of ManitobaWinnipegMBR3T 5V6Canada Manitoba HVDC Research Center 211 Commerce DriveWinnipegMBR3P 1A3Canada IEEE

Power converters and their interfacing networks are often treated as modular state-space blocks for small-signal stability studies in microgrids;they are interconnected by matching the input and output states of the network and *** resistors have been widely used in existing models to generate a voltage for state-space models of the network that require voltage *** paper accurately quantifies the adverse impacts of adding the virtual resistance and proposes an alternative method for network modelling that eliminates the requirement of the virtual resistor when interfacing converters with *** proposed nonlinear method allows initialization,time-domain simulations of the nonlinear model,and linearization and eigenvalue generation.A numerically linearized small-signal model is used to generate eigenvalues and is compared with the eigenvalues generated using the existing modelling method with virtual *** of the existing method and improvements offered by the proposed modelling method are clearly *** transient(EMT)simulations using detailed switching models are used for validation of the proposed modelling method.

关键词： Low-voltage converter state-space modelling dynamic phasor time-domain simulation eigenvalue analysis

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