Volume 60

Research on Collaborative Solution for Enhancing the Resilience of All DC Wind Farms Against Bipolar Short-Circuit Faults Kunyu Hong, Haiyun Wang, Junlong Lu, Huan Wang, Yibo Wang

Abstract

The inherent vulnerability of medium-voltage DC (MVDC) collection systems in all-DC wind farms to bipolar short-circuit faults represents a significant barrier to widespread adoption. Such faults induce uncontrolled over-currents, voltage collapse, and potential grid disconnection. Consequently, enhancing fault ride-through capability is critical for ensuring wind farm resilience. This paper proposes an integrated resilience enhancement scheme combining adaptive topology reconfiguration with grid-forming control. The fault evolution dynamics are first analyzed within representative MVDC wind farm architectures. An innovative solution is then introduced, incorporating a medium-voltage bus current-limiting module and an energy-storage capacitor compensation unit, which jointly enable rapid fault isolation and provide energy support. Furthermore, a three-tier coordinated response mechanism leverages the active power support capabilities of grid-side converters. Comprehensive simulation studies validate that the proposed integrated approach effectively mitigates the destructive effects of short-circuit faults, concurrently enhancing the system’s autonomous voltage recovery capability and significantly improving the efficiency of post-fault resilient power recovery.

Keywords onshore wind integration systems, pole-to-pole fault ride-through, system resilience, grid-forming control, transient overcurrent suppression