多変数制御方式の段階的な適用による長周期動揺抑制制御

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  • Power System Stabilization by Stepwise Application Multivariable Control Scheme
  • タヘンスウ セイギョ ホウシキ ノ ダンカイテキ ナ テキヨウ ニヨル チョウ

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There is a possibility that increasing capacity and load flow of power system may weaken damping of low frequency interarea power swing. The present paper proposes a new control design method based on stepwise application of multi-variable control (MVC) scheme for damping such inter-area oscillations.<br> For the same purpose, many papers propose two input type power system stabilizer (PSS) which use information on electrical output power (ΔP) and rotor speed (Δω) of generators. In controller design procedures, however, most of them use single machine and infinite bus (SMIB) model which is not suitable for modeling low frequency oscillations in large scale power systems.<br> The present paper discusses the characteristics of low-frequency inter-area modes which can not be explained by SMIB model. In addition, the paper makes it clear that two input type PSS can be easily designed by the proposed method named stepwise application of MVC, in which modal reduction models are used for controller design instead of conventional SMIB model. The effectiveness of the proposed scheme is demonstrated through numerical examples using a 29-machine system model.

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