Observer-based decentralized control of inter-area oscillation in Multi-infeed HVDC system

An important concern in the operation of multi- infeed HVDC systems is the inter-area low frequency oscillation due to the long-distance bulk-power transmission. In this paper, a decentralized coordinated control design is presented for improvement of inter-area oscillations in the multi-infeed HVDC system. The DC modulation controller are designed based on LQR optimal method and decentralized observers. Without degradation of controller performance, only the local measurement output is required for each damping controller, which greatly reduces the communication burden. A 7-generator, 2-HVDC system was used as the test system. The eigenvalue analysis and nonlinear time domain simulation have demonstrated the validity of the proposed decentralized controllers.

[1]  Jong-Keun Park,et al.  Observer-based decentralized optimal controller design of PSS and TCSC for enhancement of power system dynamic stability , 2000, 2000 Power Engineering Society Summer Meeting (Cat. No.00CH37134).

[2]  Zheng Xu,et al.  Coordination and optimization of small signal modulators in multi-infeed HVDC systems , 2003, 2003 IEEE PES Transmission and Distribution Conference and Exposition (IEEE Cat. No.03CH37495).

[3]  Chao Lu,et al.  Approximate Dynamic Programming Coordinated Control in Multi-infeed HVDC Power System , 2006, 2006 IEEE PES Power Systems Conference and Exposition.

[4]  Zheng Xu,et al.  Study on the pure DC transmission scheme for China's future power transmission from the West to the East , 2004, IEEE Power Engineering Society General Meeting, 2004..

[5]  Wu Xiaochen,et al.  Researches on Coordinated Control Strategy for Inter-area Oscillations in AC/DC Hybrid Grid With Multi-infeed HVDC , 2005, 2005 IEEE/PES Transmission & Distribution Conference & Exposition: Asia and Pacific.

[6]  M. Szechtman,et al.  Synchronizing and damping torque modulation controllers for multi-infeed HVDC systems , 1995 .