NDLI: Analytical modelling of point-to-point CCC-HVDC revisited

Content Provider	IET Digital Library
Author	Kaur, Jagdeep Chaudhuri, Nilanjan Ray
Abstract	Weak AC grids are incapable of providing the reactive power needed by the line-commutated converter (LCC) converters to maintain an acceptable system voltage, which leads to several operational challenges. Although voltage source converter-high-voltage DC (HVDC) can solve these issues, its power rating has not matched that of the LCC technology as yet. The available alternative is the capacitor-commutated converter (CCC) technology, which is currently in operation using back-to-back configuration. In order to explore the capability of this technology for long-distance transmission, this study proposes a comprehensive non-linear state-space averaged phasor model of CCC-HVDC connected to weak grids on both sides of HVDC. To that end, the analytical model of CCC is revisited and the need of including the capacitor dynamics and the contribution of unbalanced capacitor voltages to get a closer match with the detailed switched model is investigated. The proposed model is used to present the root-cause analysis of the dynamic performance and quantify the interaction of various states in the system with different modes, which is not possible through a detailed switched model.
Starting Page	916
Ending Page	926
Page Count	11
ISSN	17518687
Volume Number	13
e-ISSN	17518695
Issue Number	Issue 6, Mar (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/13/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2018.5257
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-12-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Grid Acceptable System Voltage Analytical Modelling Available Alternative Capacitor Capacitor Dynamics Capacitor-commutated Converter Technology Commutation Control of Electric Power System D.C. Transmission Detailed Switched Model Distributed Power Generation HVDC Power Converter HVDC Power Transmission LCC Technology Line-commutated Converter Long-distance Transmission Operational Challenges Other Power Apparatus And Electric Machine Phasor Model Point-to-point CCC-HVDC Power Capacitor Power Converter Power Grid Power Rating Power Supplies to Apparatus Power System Control Power System Transient Stability Reactive Power State Space Method Unbalanced Capacitor Voltage Voltage Source Converter-high-voltage DC Weak Grid
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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