A multi-area Thevenin equivalent based multi-rate co-simulation for control design of practical LCC HVDC system. (February 2020)

• Record Type: Journal Article
• Authors: Li, Yupeng; Shu, Dewu; Hu, Jingwei; Yan, Zheng; Zhou, Yun; Wang, Haifeng
• Is Part Of: International journal of electrical power & energy systems. Volume 115(2020)
• Publication Date: 2020-02
• Subjects: Line commutated converter (LCC) based HVDC -- Multi-rate co-simulation -- Multi-Area Thevenin Equivalent (MATE) -- Commutation failure -- Improved control strategy; 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.2019.105479
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: A multi-area Thevenin equivalent based multi-rate co-simulation is proposed, where the accuracy is guaranteed by the proposed MATE based transmission line model (MATE-TLM) and the efficiency is significantly improved. An improved control strategy based on the concept of virtual impedance is proposed to reduce commutation failures (CFs). The detailed comparative simulation results of practical large-scale AC/DC systems validate the effectiveness of the proposed MATE based multi-rate co-simulation and the improved control strategy. Abstract: The line commutated converter (LCC) based HVDC transmission is often adopted to transmit the large capacity of renewable energy, however, it is threatened by several critical issues, such as, commutation failures (CFs). In order to reduce CFs and improve the recovery characteristics of the HVDC, improved control and protection strategies are always desirable. On the other hand, an accurate and efficient electromagnetic transient (EMT) simulation method is highly necessary to design the so-called control strategy, where the traditional transient stability and EMT models cannot meet the accuracy and efficiency requirements simultaneously. To resolve these issues, a Multi-Area Thevenin Equivalent (MATE) based multi-rate co-simulation method is proposed, where the accuracy is guaranteed by the proposed MATE based transmission line model (MATE-TLM) and the efficiency is significantly improved by adopting several accelerating techniques, such as, the MATE-TLM and multi-rate co-simulation scheme. Further, a novel improved control strategy based on the concept of virtual impedance is proposed to reduce CFs and to increase the recovery speed of DC system. Simulation results of a practical AC/DC grid by the improved control strategy have well validated the effectiveness of the proposed MATE based multi-rate co-simulation method.