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| DOI： |
| Received:February 01, 2004 |
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| Coordinated nonlinear robust control of TCSC and excitation for multi-machine systems |
| Shengwei MEI, Juming CHEN, Qiang LU, Akihiko YOKOYAMA, Masuo GOTO |
| (Department of Electrical Engineering, Tsinghua University, Beijing 100084, China; Department of Electrical Engineering, Tokyo University, Tokyo, Japan; 3. EcoTopia Science Institute, Nagoya University, Nagoya, Japan) |
| Abstract: |
| An advanced nonlinear robust control scheme is proposed for multi-machine power systems equipped with thyris-tor-controlled series compensation (TCSC). First, a decentralized nonlinear robust control approach based on the feedback linearization and H∞ theory is introduced to eliminate the nonlinearities and interconnections of the studied system, and to attenuate the exogenous disturbances that enter the system. Then, a system model is built up, which has considered all the generators' and TCSC's dynamics, and the effects of uncertainties such as disturbances. Next, a decentralized nonlinear robust coordinated control law is developed based on this model. Simulation results on a six-machine power system show that the transient stability of the power system is obviously improved and the power transfer capacity of long distance transmission lines is enhanced regardless of fault locations and system operation points. In addition, the control law has engineering practicality since all the variables in the expression of he control strategy can be measured locally. |
| Key words: Multi-machine power systems TCSC Nonlinear robust Decentralized coordinated control |
