在高压直流系统(HVDC)中计算机作实时控制时,采样周期往往不同,本文采用将采样周期为T_2的离散状态变量X(kT_2)归一划到采样周期为T_1的离散时间序列上的处理方法,建立了系统的离散状态方程。根据这种模型,编制了仿真和静态稳定性计算程序,并以葛洲坝—上海高压直流系统作为算例,研究了该系统中各采样周期及调节器参数对静态稳定性的影响。 When the computer in HVDC system is under real-time control, the sampling period is often different. In this paper, the discrete state variable X (kT_2) with sampling period T_2 is normalized to the discrete time sequence with sampling period T_1 , Established the discrete state equation of the system. According to this model, the simulation and static stability calculation programs are compiled. Taking Gezhouba-Shanghai HVDC system as an example, the influence of each sampling period and regulator parameters on the static stability of the system is studied.