Abstract
The rapid development of the modern power grid has resulted in significant changes to the dynamic characteristics of regional power grids. Moreover, the operating conditions of power grids are increasingly complex, and uncertainty factors are on the rise, which makes it difficult for a conventional power system stabilizer (PSS) to provide enough damping for the power system. To solve the problem where the conventional model and parameter-tuning method of a PSS cannot adapt to the multi-operating conditions of the modern power system, a new emergency control model of PSS (E-PSS) that can adapt to the multi-operating conditions of the local power grid and a method of parameter tuning based on probabilistic eigenvalue are proposed in this paper. An emergency control channel is also installed on the PSS2B. The conventional channel is used to control the system under normal operating conditions, which ensures that the system meets the conditions of dynamic stability in 99% of operating conditions, and the emergency control is adopted immediately in extreme conditions. Through the process of parameter tuning, the adaptability of the PSS to multi-operating conditions and damping coupling are both considered. Finally, it is verified that the emergency control model of the PSS and the parameter tuning method are effective and robust by a series of simulations based on MATLAB and its Power system analysis toolbox (PSAT). The rapidity of the emergency control can guarantee its effectiveness.
Highlights
The low-frequency oscillation caused by the lack of damping is one of the serious challenges for the development of the power system
The technologies of long-distance transmission, ultra high voltage (UHV) transmission, and the alternating currentdirect current (AC-DC) hybrid system are continuously applied in the power grid, which makes the local power systems work more closely together and brings more flexibility to the operating of local power system through the switching of different transmission lines
The conventional model of a power system stabilizer (PSS) is no longer adequate to meet the requirements of the power system development, and the reduced levels of damping and stability in the power system make problems even worse [3,4,5]
Summary
The low-frequency oscillation caused by the lack of damping is one of the serious challenges for the development of the power system. To improve the dynamic stability of the power grid, the design, siting, and parameter tuning of PSS have already been extensively researched for a long time. The multi-operating conditions and multi-machine damping coupling must be considered when a robust parameter tuning method for a PSS is designed. Research studies on the parameter tuning of a PSS have mainly focused on the effect of one aspect of multi-operating conditions or multi-machine coordination. The analytic method cannot be used in a multi-machine system considering the damping coupling and the multi-operating conditions of the system Aiming at these problems, an E-PSS power system stabilizer with emergency control function is designed first. TThheeEE--PPSSSSaaddddssaappaarraalllleelloouuttppuuttcchhaannnneellaannddaasseelleeccttoorrsswwiittcchhwwhheennccoommppaarreeddwwiitthhtthheePPSSSS22BB mmooddeel,l,wwhhicichhsosolvlvesesthteheprporbolbelmemofodfadmapminpgindgedteertieorriaotrioatniocnaucsaeudsebdy bdyamdpaminpgicnogucpoliunpgliinf gthief PthSeS ParSeS naortepnrootpperrolypceorlnyficgounrfeidguinretdheincathsee ocaf seemoefregmenecryg. eTnhcey.pTahraellpeal rcahlalenlncehlaonfneeml eorfgeemnceyrgceonnctyroclotnhtartoilstsheatt tiostsheetotouttshideeooufttshideePSoSf 2tBheanPdSSd2eBsiganndeddteosiingcnleuddetoaninicnltuedrfeacaenciannteardfjaucset cthaenpaadrjaumstettherespoafreammeertgeernscoyf ceomnterrogleinnctyimcoe,notruotlpuint tthime cea, lcouultaptuiotnthreesuclatlsctuolatthioenexrceistautlitosntoregthuelateoxrc,iatantdiotnhernegpualrattiocrip, aatnedintthheen tperamrtiinciaplavtoelitnagteheretgeurmlatinioanl.vMolotaregoevreerg, uthlaetdioens.igMnoorfetohveepr,etrhipehdeersailgcnhoanf ntheel spoelrviepshtehrealpcrhoabnlenmelwsohlevrees tthheePpSrSobplaermamwehteerrseathreedPiSffiScpualtratomcehtearnsgaeroendciefftichueylt atorecsheatn. ge once they are set
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