中文摘要：

研究了交直流联合输电系统（AC／DC）的模型和鲁棒控制问题。综合考虑AC／DC系统交、直流部分的动态特性及其实际电力系统中各发电机组的阻尼系数和惯性时间常数的不同性，提出了一类五阶非仿射非线性的控制模型。针对该系统模型的特点，引入相应的鲁棒控制策略，设计了系统的鲁棒线性控制器，通过对直流系统换流器触发角的控制，实现系统稳定和对外界干扰的抑制。仿真结果验证了提出控制策略的有效性和实用性。

英文摘要：

The model and robust controller design of AC/DC power system are investigated. A fifth-order uncertain non-affine nonlinear model is presented. The proposed model can describe the dynamic characteristics of both DC and AC system. The difference of damping factor and inertial time constant between generator units is considered in the model. A robust control strategy is introduced and the robust linear controller is designed. Through the firing angle control of the rectifier and converter, it is shown that the stability of system can be improved and the external perturbation can be suppressed. Simulation results illustrate the effectiveness and practicability of the proposed control strategy.