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同时抑制低频振荡和次同步振荡的多通道广域自适应阻尼控制
Multi-channel wide area adaptive damping control for suppressing low-frequency and sub-synchronous oscillation
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摘要: 设计了一种自适应控制算法并证明了其正确性。通过总体最小二乘旋转不变技术辨识出系统降阶模型及相关振荡模态，利用带通滤波器将不同的振荡模态分解到多个通道，然后基于所提的自适应算法对每个振荡模态设计了自适应控制器，减小了各个控制器间的影响。在电磁暂态程序PSCAD/EMTDC中对向上直流孤岛运行方式进行了仿真验证。结果表明：所提控制方法相对传统比例积分微分控制有更好的控制效果；对于系统发生不同故障时具有鲁棒性。对于系统信号传输引起的时滞导致的控制器效果变差的问题，可以通过相位补偿解决。Abstract: A model reference adaptive control scheme is developed based on hyper-stability theory and is proved. Both of reduced order models of the power system and relevant oscillation frequencies are acquired by TLS-ESPRIT algorithm. The band-pass filters (Butterworth) are utilized to decompose oscillation frequencies into different channels and con-trollers are designed for each oscillation mode based on adaptive control method, thus reducing the influences of the various controllers. Xiangjiaba-Shanghai DC link under island operation condition is simulated using electromagnetic transient program PSCAD/EMTDC to demonstrate proposed control strategy. The results validate that the proposed method is able to suppress low-frequency oscillation and sub-synchronous oscillation simultaneously and the proposed method has better control performance than the traditional PID control. The problem will lead to controller performance deterioration caused signal transmission delay in system and it is resolved by phase compensation.
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