Multi-Channel HVDC Supplementary Damping Controller Design Based on Multi-Stage Linear Quadratic Regulator Method
Ding Yuanyuan1, Liu Tianqi1, Gao Feng2, Li Xingyuan1
1. School of Electrical and Information Sichuan University Chengdu 610065 China; 2. State Grid Ningxia Electric Power Research Institute Yinchuan 750000 China
Abstract：The reduced order power system models and relevant oscillation frequencies were identified by the total least squares (TLS)-estimation of signal parameters via rotational invariance techniques (ESPRIT) algorithm. Firstly, using Butterworth band-pass filter to decompose oscillation frequencies into different channels based on system oscillation modes. Thereafter, the multi-channel HVDC supplementary damping controller was designed by the multi-stage LQR method and configured with the state observer by the Ackermann formula. It included one low frequency oscillation channel and two sub-synchronous oscillation channels, which worked separately. The designed multi-channel HVDC supplementary damping controller provided damping for different oscillation modes to suppress low frequency oscillation and sub-synchronous oscillation. The proposed control strategy was demonstrated detailedly in a realistic HVDC system model built in PSCAD. Compared with the multi-stage linear quadratic regulator (LQR) method, LQR method and PI method, the simulation results in power systems computer aided design (PSCAD) have verified the effectiveness and robustness of the designed controller. The multi-stage LQR method has the certain significance for the practical application.
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2017, Vol. 32 
