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Online Inertia Estimation Using electromechanical oscillation Modal Extracted from Synchronized Ambient Data

Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 241-244页

作者： Bo Wang Deyou Yang Guowei Cai Jin Ma Zhe Chen Lixin Wang School of Electrical Engineering Northeast Electrical Power UniversityJilin 132012China School of Electrical and Information Engineering The University of SydneySydneyAustralia Department of Energy Technology Aalborg UniversityAalborgDenmark

An ambient modal framework for inertia estimation using synchrophasor data is proposed in this letter.Specifically,an analytical formulation is developed for the estimation of inertia based on the frequency and damping ratio modes extracted from ambient data.An advantage of the proposed framework is that it can rely on synchronized ambient data under non-disturbed conditions for online estimation and tracking of inertia.Ultimately,numerical simulation studies and physical experiments demonstrate the feasibility of the proposed approach.

关键词： Inertia electromechanical oscillation ambient modal

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Fast Uncertainty Quantification of electromechanical oscillation Frequency on Varying Generator Damping

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Journal of Modern Power Systems and Clean Energy 2023年第6期11卷 2043-2048页

作者： Yongli Zhu Chanan Singh Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTX77840USA

This letter develops a fast analytical method for uncertainty quantification of electromechanical oscillation frequency due to varying generator dampings. By employing the techniques of matrix determinant reduction, two types of uncertainty analysis are investigated to quantify the impact of the generator damping on electromechanical oscillation frequency, i.e., interval analysis and probabilistic analysis. The proposed analytical frequency estimation formula is verified against conventional methods on two transmission system models. Then, Monte Carlo experiments and interval analysis are respectively conducted to verify the established lower/upper bound formulae and probability distribution formulae. Results demonstrate the accuracy and speed of the proposed method.

关键词： electromechanical oscillation interval analysis Monte Carlo simulation quadratic eigenvalue problem uncertainty quantification

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Connection Between Damping Torque Analysis and Energy Flow Analysis in Damping Performance Evaluation for electromechanical oscillations in Power Systems

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 19-28页

作者： Yong Hu Siqi Bu Xin Zhang Chi Yung Chung Hui Cai Department of Electrical Engineering and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHong KongChina Shenzhen Research Institute The Hong Kong Polytechnic UniversityShenzhenChina Centre for Energy Systems and Strategy Cranfield UniversityCranfieldUK Department of Electrical and Computer Engineering University of SaskatchewanSaskatoonCanada State Grid Jiangsu Economic Research Institute NanjingChina

The damping performance evaluation for electromechanical oscillations in power systems is crucial for the stable operation of modern power systems.In this paper,the connection between two commonly-used damping performance evaluation methods,i.e.,the damping torque analysis(DTA)and energy flow analysis(EFA),are systematically examined and revealed for the better understanding of the oscillatory damping mechanism.First,a concept of the aggregated damping torque coefficient is proposed and derived based on DTA of multi-machine power systems,which can characterize the integration effect of the damping contribution from the whole power system.Then,the pre-processing of measurements at the terminal of a local generator is conducted for EFA,and a concept of the frequency-decomposed energy attenuation coefficient is defined to screen the damping contribution with respect to the interested frequency.On this basis,the frequency spectrum analysis of the energy attenuation coefficient is employed to rigorously prove that the results of DTA and EFA are essentially equivalent,which is valid for arbitrary types of synchronous generator models in multi-machine power systems.Additionally,the consistency between the aggregated damping torque coefficient and frequency-decomposed energy attenuation coefficient is further verified by the numerical calculation in case studies.The relationship between the proposed coefficients and the eigenvalue(or damping ratio)is finally revealed,which consolidates the application of the proposed concepts in the damping performance evaluation.

关键词： electromechanical oscillation damping performance damping torque analysis(DTA) energy flow analysis(EFA) frequency spectrum

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Small signal stability region of power systems with DFIG in injection space

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Journal of Modern Power Systems and Clean Energy 2013年第2期1卷 127-133页

作者： Chao QIN Yixin YU Key Laboratory of Smart Grid Tianjin UniversityTianjin 300072China

The modal analysis method is utilized to study the influence of doubly-fed induction generator(DFIG)on electromechanical oscillations.On this basis,the small signal stability region(SSSR)of power systems with DFIG in injection space is evaluated and the corresponding relationship between SSSR boundary and electromechanical oscillations is analyzed.The effects of the locations of DFIG on SSSR are considered.It is found that the boundary of SSSR consists of several smooth surfaces,which can be approximated with hyper-planes in engineering application.With the integration of DFIG,SSSR becomes smaller,thus indicating the deterioration of the small signal stability of the system.The 11-bus system with four generators is used to illustrate the proposed method.

关键词： Doubly-fed induction generator(DFIG) Modal analysis electromechanical oscillation Small signal stability region(SSSR)

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