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中文摘要：
火电机组经高压直流输电有可能引起轴系振荡,严重影响电力系统的稳定性,故为高压直流输电系统设计次同步阻尼控制器尤为重要。从系统状态方程的角度出发,基于系统状态方程,通过滤波器提取轴系各固有扭振模态,进而提出基于TLS-ESPRIT和射影定理设计直流附加次同步阻尼控制器,最终实现各个模态的分层控制。射影控制可保留系统的主导特征根,能够在保留系统实际信息的同时降低控制器的阶数。以某电网直流系统作为实例仿真模型,仿真结果表明,基于TLS-ESPRIT和射影定理分层控制的阻尼控制器可有效增大系统阻尼,实现次同步振荡的快速抑制,且控制器阶数较低,便于工程实现。
英文摘要：
The design of subsynchronous damping controller is particularly important for HVDC system to prevent the possible torsional vibration of connected large thermal power units. The shaft torsional vibration modes are extracted by filters based on the system state equation,the supplementary subsynchronous damping controller is designed based on TLS-ESPRIT and projective theorem to realize the hierarchical control for each vibration mode. The projective control retains the dominant eigenvalues of system,which reserves the actual system information while reduces the controller order. An actual DC system is taken as an example simulation model and the simulative results show that,the damping controller based on TLS-ESPRIT and projective theorem for hierarchical control increases the system damping effectively and achieves the quick damping of subsynchronous vibrations. The order of controller is low and its engineering implementa-tion is easy.
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