DECENTRALIZED COORDINATED CONTROL OF MULTI-INFEED HVDC SYSTEM FOR DAMPING INTER-AREA OSCILLATION

F. Yang,∗ C. Chen,∗ X.T. Wang,∗ and Y.X. Xu∗

Keywords

Multiinfeed HVDC, lowfrequency oscillation, decentralized control, modulation controller, linearquadratic regulator, state observer

Abstract

An important concern in the operation of multi-infeed high voltage direct current (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 the improvement of inter-area oscillations in the multi-infeed HVDC system. The HVDC modulation controllers are designed based on Linear-quadratic regulator (LQR) optimal method and decentralized observers. Without degradation of controller performance, only the local measurements are 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.

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