核心概念
The proposed extended admittance modeling method with explicit characterization of synchronization (sync) loops can intuitively reveal the impact of diverse sync dynamics on the oscillatory stability of converter-interlinked power systems.
摘要
The paper proposes an extended admittance modeling method to explicitly characterize the sync loops in converter-interlinked power systems for improved stability assessment.
Key highlights:
- An extended four-port impedance model (EIM) of a generic AC/DC converter is developed, which can explicitly represent the sync loop as a virtual port.
- The extended impedance network (EIN) is formulated by assembling the EIMs according to the system topology, allowing the frequency-domain modal analysis (FMA) to be directly applied to the sync nodes/branches.
- The interactions between typical grid-following (GFL) and grid-forming (GFM) sync loops on the system oscillatory stability are revealed through case studies of a point-to-point HVDC system.
- The sync-node extended FMA method can intuitively identify the dominant sync loops and their participation in the system instability, which is not possible with the conventional FMA based on the pure electrical impedance network.
統計資料
The following sentences contain key metrics or figures used to support the author's analysis:
"By decreasing the damping coefficient D, the EIN model will generate one pair of RHP-zeros at around 4.3974Hz (dq frame), indicating that the system is unstable."
"The predicted change Δλ is calculated by multiplying the theoretically calculated sensitivity with the corresponding component 5% increment, while the actual change is obtained by re-computing λ of the updated system model (replace the corresponding component value with 105% times of original value) and subtracting the original λ."
引述
"The proposed extended admittance modeling method with explicit characterization of synchronization (sync) loops can intuitively reveal the impact of diverse sync dynamics on the oscillatory stability of converter-interlinked power systems."
"The interactions between typical grid-following (GFL) and grid-forming (GFM) sync loops on the system oscillatory stability are revealed through case studies of a point-to-point HVDC system."