Speaker：Jinhao Qiu
Location: SIST 1A-200
Time：22nd Apr. 2026 14:00
Host: Prof. Yu Liu
Abstract:
With the rapid growth of renewable energy, high-voltage direct current (HVDC) technology is emerging as a key solution for long-distance, large-scale power transmission. Among the different HVDC approaches, systems based on Modular Multilevel Converters (MMCs) are especially favored due to their outstanding controllability, high modularity, and relatively low switching losses. These features make MMC-HVDC systems highly competitive for integrating variable renewable energy sources into traditional AC networks. However, despite their promise, MMC-HVDC systems face considerable challenges under fault conditions. Compared with conventional transmission lines, their transient fault dynamics are more complex and severe, creating significant difficulties for transmission line protection.
This seminar will present an underground cable line protection scheme based on dynamic state estimation. Dynamic state estimation can track transient phenomena of the line and is often used in protection algorithms. It determines the line status in real time by detecting the consistency between the dynamic model and the actual line. First, starting from the traveling wave equations, the frequency-domain exact model of the line is derived, and then transformed into a time-domain high-order differential equation via the inverse Laplace transform. After discretization, a dynamic state estimation method is used to design the protection algorithm.
Biography:
Mr. Jinhao Qiu joined PSPAL in September 2022. He is currently a Ph.D student in PSPAL (starting from September 2025). He received the B.S. degree of Electrical and Electronic Engineering from ShanghaiTech University, in Summer 2023. His research interests include dynamic states estimation and protection of transmission lines.
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