Optimization voltage-dependent current order limiter parameters for improving the voltage stability of multi-DC receiving-end power grid

• Published in: Journal of physics. Conference series 2024-09, Vol.2849 (1), p.12064
• Main Authors: Zhang, Yijing, Shi, Yanqiang, Liu, Jiachen, Huang, Minjie, Luo, Heyu, Liu, Xiaolong
• Format: Article
• Language: English
• Subjects: Alternating current; Commutation; Direct current; Electric power systems; Optimization; Optimization techniques; Parameters; Short circuits; Voltage stability
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/2849/1/012064

Power grids with multi-DC high voltage direct current (HVDC) commonly face challenges such as inadequate voltage support, exacerbated interactions between AC and DC, and complex and variable operation modes. Severe AC faults in these grids can easily trigger consecutive failures in DC commutation, potentially leading to a collapse in the voltage across the entire network. This study introduces a synchronized optimization technique aimed at improving voltage stability within receiving-end power systems by adjusting the parameters of the Voltage Dependent Current Order Limiter (VDCOL). Firstly, principles for adjusting VDCOL parameters are proposed grounded on voltage instability mode. Derived from the sorting outcomes of the multi-infeed short-circuit ratio, parameters of VDCOL are adjusted to ultimately suppress commutation failures and enhance the capability of receiving-end power grids to accept external power. Finally, the simulation result verifies that optimizing VDCOL parameters according to the proposed method significantly increases the capability of receiving-end power grids to accept external power.