Impact of Model Complexity on Mixed AC/DC Transient Stability Analysis

Abstract

Model complexity may have a significant impact on transient stability results of mixed AC/DC systems. The dynamics of various mixed AC/DC models with a focus on different generator orders and multi-level modular converter (MMC) VSC-HVDC model types is investigated within this paper. MMC VSC-HVDC converter models are based on average value model (AVM) and simplified AVM, while 2 nd , 3 rd and 6 th order generator models are formulated within the research. The paper also considers the impact of inner current control bandwidth. Based on the simulation result, substantial change over the transient stability result is seen with respect to different types of modelling complexity used within the research.

Stability and control of mixed AC–DC systems with VSC‐HVDC: a review

“…Several case studies have been conducted in representative realistic power systems by using time-domain simulation in the electromechanical time frame to identify the impact of VSC-HVDC links on largedisturbance angle stability. The work in [65] explored the Table 4 Summary of key technical aspects related to small-disturbance angle stability Serial number Key aspect 1 system operating conditions and the control configurations of VSC-HVDC have a large influence on the small-disturbance angle stability of the system 2 fast and appropriately tuned controllers can significantly improve the small-disturbance angle stability of the system 3 the sensitivity of various control limits to the small-disturbance angle stability of the system has rarely been considered 4 the impact of MI-HVDC on small-disturbance angle stability with various VSC-HVDC control principles and operating conditions is yet to be comprehensively assessed 5 significant work has been conducted to design VSC-HVDC-based POD using complex control theories modelling complexity of VSC-HVDC system on transient stability. The analysis conducted in [65] used the generic average model (AVM) and simplified AVM of VSC-HVDC system with different bandwidths of inner and outer controllers.…”