PSS design for damping of inter-area power oscillations by coherency-based equivalent model

Chun Liu*, Ryuichi Yokoyama, Kaoru Koyanagi, Kwang Y. Lee

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    24 Citations (Scopus)


    In Japan, low-frequency oscillations have been observed on trunk transmission systems, and have been the subject for studies in fields of operation, control, and devices by many power system utilities. Power system stabilizers (PSS) are very effective controllers in enhancing the damping of low-frequency oscillations, since the controllers can increase damping torque for inter area modes by introducing additional signals into the excitation controllers already equipped with generators. To analyze and solve the problem of long-term poor damping oscillation phenomena, a method is presented to find the best allocation and to design PSS for damping inter-area power oscillations. The method is based on the single-machine-infinite-bus models derived from the multi-machine power system by coherency-based reduction technique. Dynamic simulations using a 10-machine power system model are presented in order to show the effectiveness of the PSS designed according to the proposed method.

    Original languageEnglish
    Pages (from-to)539-548
    Number of pages10
    JournalInternational Journal of Electrical Power and Energy System
    Issue number7
    Publication statusPublished - 2004 Oct


    • Coherence
    • Frequency response method
    • Heffron-Phillips model
    • Low-frequency oscillation
    • Power system stabilizer

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering


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