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Data and Model Hybrid Driven Non-Intrusive Wideband Impedance Measurement for LCC-HVDC Systems
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PRE
AI
王
J
Z
张
DOI：10.1109/TPWRD.2025.3648375.png)
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Abstract
En 中文
Line commutated converter based high-voltage direct-current (LCC-HVDC) systems connected to weak grids are susceptible to wideband oscillations, threatening system stability. In this paper, a data driven modeling based non-intrusive wideband impedance measurement method is proposed for LCC-HVDC systems to monitor the dynamic characteristics of the receiving-end grid and assess the risk of wideband oscillations, without the need for additional primary equipment or external harmonic disturbances injection. First, the harmonic state-space (HSS) impedance model of LCC-HVDC is established, and the harmonic interaction mechanism between LCC system and the receiving-end grid is analyzed. Then, an impedance measurement method based on data-driven modeling is developed, incorporating an adaptive variable time-step (AVTS) sampling scheme and a dynamic frequency warping (DFW) technique to enable real-time assessment of oscillation risk profiles with reduced computational burden. Finally, the proposed method is validated by using the CIGRE benchmark system as well as the hardware-in-the-loop (HIL) tests.
Keywords:
Impedance
Impedance measurement
Wideband
Integrated circuit modeling
Harmonic analysis
Power system stability
Analytical models
Stability criteria
Oscillators
Voltage control
Line commutated converter (LCC)
high-voltage direct-current (HVDC)
non-intrusive impedance measurement
harmonic state space (HSS)
adaptive variable time step (AVTS)
dynamic frequency warping (DFW)
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