多機系統を考慮した発電機制御による系統安定化制御方式の検討

抄録

This paper proposes a new control scheme for a decentralized generator excitation and governor control system in multi-machine power systems. The authors have developed the adaptive, multivariable optimal generator control systems which coordinates the excitation and governor control systems. They are based on Linear Quadratic Integral (LQI) control theory. They are confirmed to be effective for the improvement of power system stability compared with conventional excitation and governor control systems. However, it is impossible to design the system considering overall power system stability because it is usually designed using one machine infinite bus system model. The proposed scheme is designed using a model of each generator considering relation among other generators. Interactions among generators are modeled as equivalent disturbance from other generators. The order of the model is reduced using model reduction methods. Therefore, the decentralized control is realized by applying a disturbance rejection control based on H_∞ control theory. The performance of the proposed scheme is evaluated by simulations using two different multi-machine power system models. Simulation results indicate that the proposed scheme improves overall power system stability and can outperform the conventional controls including LQI control.