• LU Zhixue

  LU Zhixue

  College of Electrical Engineering and Information Technology, Sichuan University, Chengdu 610065, China
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• LIU Tianqi

  LIU Tianqi

  College of Electrical Engineering and Information Technology, Sichuan University, Chengdu 610065, China
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• CHEN Xiang

  CHEN Xiang

  College of Electrical Engineering and Information Technology, Sichuan University, Chengdu 610065, China
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• HE Chuan

  HE Chuan

  College of Electrical Engineering and Information Technology, Sichuan University, Chengdu 610065, China
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• TAO Yan

  TAO Yan

  College of Electrical Engineering and Information Technology, Sichuan University, Chengdu 610065, China
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College of Electrical Engineering and Information Technology, Sichuan University, Chengdu 610065, China

In the high voltage direct current(HVDC)transmission system, there is a risk of harmonic instability when the DC system is connected to a weak AC system. For the single pole 12-pulse converter, a risk assessment method of harmonic instability in HVDC transmission system considering the effect of two-terminal converters is proposed based on the modulation theory of converter switching function, and under the condition of saturation of converter transformer core. The evaluation method takes into account the commutation angle of the commutation process and the mutual effect between the two-terminal AC system and DC system. When the equivalent harmonic impedance of the DC system is calculated, the commutation impedance of two-terminal converters is taken into account. A validation model is established, in which the existing criteria and the proposed criteria are used to make risk assessment under different network parameters and compared with the simulation results in the time domain. The comparison results verify the accuracy and superiority of the proposed evaluation method. The simulation results further demonstrate that the system harmonic impedance, commutation angles and core saturation will affect the harmonic instability of system.

high voltage direct current(HVDC)transmission system; switching function theory; harmonic analysis; engineering criterion