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The Research of HVDC Commutation Failure Transient Characteristics

Author: ZhangRuLian
Tutor: ZhaoChengYong
School: North China Electric Power University
Course: Proceedings of the
Keywords: HVDC Commutation failure Transient characteristics Prony Algorithm Distortion
CLC: TM721.1
Type: Master's thesis
Year: 2011
Downloads: 116
Quote: 1
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Abstract


The Ningdong - Shandong HVDC projects put into operation the safe and stable operation of the Shandong power grid will be challenges. In view of the special operational features of the DC system , DC system failure potential hazards to the security of the AC relay and AC grid , it is necessary to study the electrical transient characteristics of the DC system fault conditions when the exchange system . Shandong power grid with Ningdong - Shandong HVDC system in PSCAD / EMTDC environment , detailed electromagnetic transient modeling . Based on this model , caused by AC line fault inverter commutation failure simulation . Prony method is used to change the phase after the failure of the AC line electrical transient analysis , by fitting waveform simulation waveforms coincide , indicating the effectiveness of the algorithm . The Prony analysis showed that DC system to the AC line commutation failure to inject a lot of transient harmonic components of the AC line the electrical quantities waveform distortion , some components of the amplitude , may affect the AC protection devices the correct action . The different types of short-circuit failure occurs when the different position of Qingdao converter station near the AC line and DC systems commutation failure of the electrical transient characteristics of the AC system . The simulation results show that , commutation failure severe distortion of the fault line of the current of the parallel line and fault phase current distortion degree of fault location and fault type different fault than the line at both ends of the fault occurs , the middle of the line serious distortion of single phase short circuit fault distortion serious than the three-phase short-circuit fault . Cause analysis shows that the proportion of the AC line current distortion degree after the failure over the short-circuit current to flow with the lines , the harmonic currents generated by the DC system . Ingredients and ingredients affect the short-circuit current share of the proportion of factors failure distribution of the short-circuit current and short-circuit fault on the DC commutation failure degree of influence , the former with the entire network topology , operating mode and the location of the fault , the latter fault type . Shandong power grid power grid and specific operating conditions , in line single-phase short-circuit fault occurs in the middle , parallel line current distortion is the most serious .

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Transmission and distribution technology > Transmission system > DC system power transmission
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