Virtual inertia and droop parameters quantitative determination method for VSC‐HVDC in receiving‐end area power systems with online inertia estimation based

Abstract

SummaryVoltage source converter‐based high voltage direct current (VSC‐HVDC) transmissions are commonly employed to deliver as much inertial and primary frequency regulation (PFR) power as possible to a frequency‐disturbed system to ensure stable operation, which causes the unreasonable application of limited frequency regulation resources. Hence, this paper, based on online inertia estimation results, presents a novel method to determine the virtual inertia and droop parameters (MDVID) for VSC‐HVDC to weaken this deficiency. Firstly, the measured ambient active power and frequency variation data are applied as input and output of the auto‐regressive moving average with extra input (ARMAX) identification model, which is used to obtain the effective inertia of the studied system. Next, compared with the expected system dynamic frequency response characteristics under disturbance, the required and quantitative variation of the studied system inertia and droop parameters is acquired through the system frequency response (SFR) model. Then, the obtained variation of inertia and droop parameters is assigned to VSC‐HVDC based on the ratio of the rated capacity of the studied system to that of VSC‐HVDC. Finally, the simulation results confirmed the predominance of the proposed MDVID compared with other strategies in the event of a fault and step load variation.