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Controllers for Power Electronic Systems
Gerard Ledwich 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
There are many approaches to developing a switching controller which achieves a desired end. This paper aims to understand the constraints and the drawbacks of many different forms of control and the factors which make particular solutions more attractive.
On Power System Frequency Control in Emergency Conditions
Bevrani, H.,Ledwich, G.,Ford, J. J.,Dong, Z.Y. The Korean Institute of Electrical Engineers 2008 Journal of Electrical Engineering & Technology Vol.3 No.4
Frequency regulation in off-normal conditions has been an important problem in electric power system design/operation and is becoming much more significant today due to the increasing size, changing structure and complexity of interconnected power systems. Increasing economic pressures for power system efficiency and reliability have led to a requirement for maintaining power system frequency closer to nominal value. This paper presents a decentralized frequency control framework using a modified low-order frequency response model containing a proportional-integral(PI) controller. The proposed framework is suitable for near-normal and emergency operating conditions. An $H_{\infty}$ control technique is applied to achieve optimal PI parameters, and an analytic approach is used to analyse the system frequency response for wide area operating conditions. Time-domain simulations with a multi-area power system example show that the simulated results agree with those predicted analytically.
On Power System Frequency Control in Emergency Conditions
H. Bevrani,G. Ledwich,J. J. Ford,Z. Y. Dong 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.4
Frequency regulation in off-normal conditions has been an important problem in electric power system design/operation and is becoming much more significant today due to the increasing size, changing structure and complexity of interconnected power systems. Increasing economic pressures for power system efficiency and reliability have led to a requirement for maintaining power system frequency closer to nominal value. This paper presents a decentralized frequency control framework using a modified low-order frequency response model containing a proportional-integral (PI) controller. The proposed framework is suitable for near-normal and emergency operating conditions. An H∞ control technique is applied to achieve optimal PI parameters, and an analytic approach is used to analyse the system frequency response for wide area operating conditions. Time-domain simulations with a multi-area power system example show that the simulated results agree with those predicted analytically.
Han, Byung M.,Ledwich, Gerard John Wiley Sons, Ltd. 2008 European transactions on electrical power Vol.18 No.3
<P>This paper describes dynamic performance analysis of Unified Power Flow Controller (UPFC) composed of cascaded H-bridge and single-phase multi-winding transformers for isolation. The operational characteristic was analyzed through simulations with PSCAD/EMTDC, and experimental works with a scaled model. The UPFC proposed in this paper can be directly connected to the transmission line without series injection transformers. It has flexibility to expand the operation voltage by increasing the number of H-bridges. Copyright © 2007 John Wiley & Sons, Ltd.</P>