多馈入直流输电系统LQR调制控制器的设计

以含有多馈入直流系统的互联电网为研究对象，采用近似线性化的方法得到整个系统模型，设计了线性最优控制（LQR）直流电流调制控制器。电力系统中的转子角反馈控制一般是改变系统的振荡频率，而对转速的反馈控制改变的是系统的阻尼。结合这一特点，提出了3条实用的简化措施，使各条直流线路只需要自身直流电流及附近几台发电机的转速信号作为调制信号，大大减轻了信号采集和传输的负担。所提出的简化措施能够近似满足全状态反馈时的目标函数，即保证控制器性能与全状态反馈时基本相同。在IEEE 39节点系统上进行了仿真计算，仿真结果验证了所设计的控制器的有效性。

Design of LQR DC-current Modulation Controller for Multi-infeed HVDC Systems

Based on approximately linearized system model, a linear quadratic regulator (LQR) DC current modulation controller for multi-infeed HVDC system is presented. In power system, generally, using rotor angles as feedback signals can change oscillation frequencies, and using rotor speed as feedback signals can change the oscillation damps. Based on the above two characteristics, three measures are presented to simplify the implementation of the proposed LQR controller. Without degradation of good performance, for each DC link, the simplified LQR controller only requires the adjacent generators ' relative speeds as modulation signals. Thus the communication burden is greatly relieved because less information is needed to transmit around the system. Simulation results on a 10-machine 39-bus AC system with 5 DC links located in it show that the simplified LQR modulation controller is effective.