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Mode-based Damping Torque Analysis in power system low-frequency oscillations

CSEE Journal of power and Energy systems 2023年第4期9卷 1337-1347页

作者： Jingtian Bi Huadong Sun Shiyun Xu Ruihua Song Bing Zhao Qiang Guo the State Key Laboratory of power Grid Safety and Energy Conservation China Electric Power Research InstituteBeijing 100192China

The mode-based damping torque analysis(M-DTA)method for studying the effect of an external controller on power system low-frequency oscillations is proposed in this paper.First,based on the interconnection model between the system and the controller in the frequency domain,the oscillation loop corresponding to the electromechanical oscillation mode is built,and then the mode-based damping torque of the controller can be calculated.Then,the application of the M-DTA method in the power system is illustrated.The derivation shows that in the single-machine infinite-bus power system,the M-DTA method is completely equivalent to the classical damping torque analysis(C-DTA)method.In the multi-machine power system,the mode-based damping torque directily reflects the effect of the controller on the oscillation mode,overcoming the shortcomings of the C-DTA method in which there is no direct correspondence between the damping torque and the oscillation mode.By deriving the relationship with the residue index,the M-DTA method shows higher accuracy than the residue method in applications,such as controller parameter adjustment.Finally,two example power systems are presented to demonstrate the application of the proposed M-DTA method.Index Terms-Electromechanical oscillation mode,FACTS,interconnection model in the frequency domain,mode-based damping torque analysis(M-DTA),power system low-frequency oscillation,PSS,residue method.

关键词： Electromechanical oscillation mode FACTS interconnection model in the frequency domain mode-based damping torque analysis(M-DTA) power system low-frequency oscillation PSS residue method.

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Small-signal Angular Stability of power system as Affected by Grid-connected Variable Speed Wind Generators—A Survey of Recent Representative Works

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CSEE Journal of power and Energy systems 2017年第3期3卷 223-231页

作者： Wenjuan Du Jingtian Bi H.F.Wang State Key Laboratory of Alternate Electric power systems(SKLAEPS)with New Energy Resources North China Electric Power UniversityBeijing 102206China

This paper reviews the status and progress of the investigation on power system small-signal angular stability as affected by grid-connected variable speed wind generators(VSWGs).The review is carried out on the basis of a survey of recently published representative papers.Strategies of the investigation made in those selected papers are classified into two groups:1)VSWGs displacing synchronous generators(SGs);2)VSWGs simply being added in a power system.The diversification of the results of the investigation is highlighted in the survey.Careful analysis on two strategies of the investigation is conducted in this paper.It is revealed that in the strategy of VSWGs displacing SGs,there are two factors which could affect power system small-signal angular stability differently:1)Withdrawing the SGs’dynamics;2)adding the VSWGs’dynamics.In the strategy of adding VSWGs in the power system,there are also two affecting factors:1)Change of load flow brought about by the VSWGs;2)dynamic interactions with the SGs introduced by the VSWGs.Hence diversified results of the investigation obtained so far are not only due to the dependence of the investigation on sample power systems used,but also caused by the mixture of different affecting factors.This paper is concluded with a summary of key issues of the investigation for future work.

关键词： Electromechanical oscillation modes power system dynamics power system low-frequency oscillation power system small-signal angular stability synchronous generators(SGs) variable speed wind generators(VSWGs)

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