Authors: L. Xu, L. Fan and Z. Miao
Accepted by IEEE trans. Power Delivery
Abstract: Resonances can have negative impact on a Voltage Source Converter-High Voltage DC (VSC-HVDC) system. This paper develops dc impedance models for the rectifier and inverter
stations for a VSC-HVDC system when they are viewed from a dc terminal. The impedance models take converter controllers into account. The derived impedance models are validated by comparing frequency responses of the analytical model and the impedance measured at the dc terminal from a detailed VSC-HVDC model simulated in a real-time digital simulator. Resonances are examined in frequency domain (e.g., Bode plots and Nyquist plots) using the derived analytical impedance models. The analysis is verified by time-domain simulations. Real-time digital simulation in RT-Lab demonstrates that the dc capacitor has a significant impact on resonances while power transfer level
has an insignificant impact on resonances.
Index Terms—Admittance, impedance, resonance, VSCHVDC.
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