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Study On Influence Factor Of Flexible HVDC System Small-signal Stability

Posted on:2018-12-23Degree:MasterType:Thesis
Country:ChinaCandidate:J C ZhangFull Text:PDF
GTID:2382330515457579Subject:High Voltage and Insulation Technology
Abstract/Summary:PDF Full Text Request
Nowadays,with growing demand for new energy access and weak system or passive system power supply,the flexible HVDC system technology developed rapidly.Flexible HVDC system is a highly power electronic system,many controllable components provide convenience for its flexible and reliable operation.Flexible HVDC technology brings convenience and development for the power grid.Howerer,it is a challenge for the safety and stability analysis of power system.Voltage source converter has a high dynamic frequency range,which makes it complex to couple with the AC system,and makes it more difficult to analyze the stability of flexible HVDC system.In this paper,we did research on stability of double side flexible HVDC system facing small signal,and analyzed the effect of system influence factors on small signal stability.Based on the block modeling ideas,the VSC-HVDC system equation was linearized on steady-state operating point.Combined with the state space equation,it established double side flexible HVDC system and communication system double end small signal model,which Included inverter,control system,Ac system and dc lines.Meanwhile,MATLAB/Simulink small signal model was built.In this paper,we did research on stability of double side flexible HVDC system facing small signal,and analyzed the effect of system influence factors on small signal stability.Based on the block modeling ideas,the VSC-HVDC system equation was linearized on steady-state operating point.Combined with the state space equation,it established double side flexible HVDC system and communication system double end small signal model,which Included inverter,control system,Ac system and dc lines.Meanwhile,MATLAB/Simulink small signal model was built.Based on PSCAD/EMTDC electromagnetic transient simulation tool,it verified the accuracy of the small signal model established in this paper and the analysis on small signal stability.
Keywords/Search Tags:Flexible HVDC system, Small signal model, Short-circuit ratio, Typical control parameters, Small-signal stability
PDF Full Text Request
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