Oscillation Suppression Method of Power Electronic Alternating Current Distribution System Based on Weak Point Location

doi:10.16183/j.cnki.jsjtu.2024.054

Abstract

Abstract:

In recent years, power electronic converters have been widely used in alternating current (AC) power distribution systems due to their controllability and flexibility. However, as the penetration of power electronic equipment continues to increase, the oscillation stability issues caused by high-penetration power electronics have become one of the key technical challenges faced by new power systems. In actual AC power distribution systems, the sub/super-synchronous oscillation problems occur frequently, seriously affecting industrial production and the safe and stable operation of power grid. Therefore, an oscillation suppression method for power electronic AC distribution system based on weak point location is proposed in this paper. First, the sub/super-synchronous stability of multi-machine system is analyzed based on dominant eigenvalue by constructing the frequency-domain impedance network of power electronic AC power distribution system and establishing the node admittance matrix model of the system. Then, the participation factor matrix of the weak mode of the system is further calculated to determine the weak nodes, and node coupling degree is defined to quantitatively evaluate the interaction between nodes. Finally, an oscillation suppression method based on DC voltage feedback active damping is proposed. The effectiveness of the proposed method is verified through case studies on an actual power electronic AC power distribution system.

Key words: power electronic based power system, subsynchronous oscillation, weak point location, node participation factor, frequency-domain modal analysis

CLC Number:

TM712

SHEN Bing, CHAI Wei, WANG Kai, LI Xiaoyuan, LÜ Jing. Oscillation Suppression Method of Power Electronic Alternating Current Distribution System Based on Weak Point Location[J]. Journal of Shanghai Jiao Tong University, 2026, 60(1): 32-41.

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