Design of hybrid series converter valve considering device switching characteristics. (October 2022)

• Record Type: Journal Article
• Authors: Zhan, Ruiqi; Ye, Yunxia; Xia, Jiahang; Zhao, Chengyong
• Is Part Of: International journal of electrical power & energy systems. Volume 141(2022)
• Publication Date: 2022-10
• Subjects: HVDC -- Commutation failure -- Hybrid series converter valve -- Turn-off time control -- Dynamic voltage equalization design; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2022.108224
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: The composition and working states of HSCV are designed. The turn-off process of HSCV is analyzed, and the reliability of commutation is proved. A turn-off time control strategy of HSCV is designed to turn off the switches in time. A principle of dynamic voltage equalization branch is proposed to solve the overvoltage problem of HSCV. The CFII ranges of HSCV-HVDC and ELCC-HVDC are compared. Abstract: The line commutated converter high voltage direct current (LCC-HVDC) has a weak ability to resist commutation failure (CF). In order to solve this problem, we studied a hybrid series converter valve (HSCV) composed of thyristors and the fully controllable switches in series. The working states of HSCV were designed, besides, the operating principle of HSCV was analyzed. Considering the characteristics of the device, HSCV's turn-off time control was provided. The voltage and current stress in the turn-off process of HSCV was analyzed, dynamic voltage equalization parameters of HSCV were designed also. The simulation results of SABER and PSCAD/EMTDC showed that HSCV increases the time for the thyristor to recover its forward blocking capability, thereby preventing the valve from re-conducting and switching phases. That is why HSCV-HVDC has stronger commutation failure suppression than LCC-HVDC and ELCC-HVDC. In addition, the parameter design principle proposed in this paper can reasonably design the dynamic voltage balancing branch, effectively solve the overvoltage problem of the turn-off tube, and meet the device parameter requirements.