一种基于泰勒展开的临界降阶直流配电系统稳定控制算法

以中压直流（medium-voltage DC, MVDC）配电系统为研究对象，建立了直流系统的临界降阶模型，研究了恒功率负载对系统稳定性的影响。由于直流系统中恒功率负载的负阻抗特性会导致系统电压发生振荡失稳现象，给稳定运行带来不利影响，提出一种能够提高MVDC配电系统电压稳定性的稳定控制算法，通过状态反馈控制、下垂控制及电压控制中关键参数的分散灵活设计，改变系统主导极点在s域平面的位置，有效提高MVDC配电系统的稳定性。仿真结果验证了临界降阶模型的合理性以及基于泰勒展开控制算法的有效性。

A Stabilization Control Method of Supercritical Reduced-Order Medium-Voltage DC Distribution System Based on Taylor Expansion

In this paper, a typical medium voltage DC (MVDC) distribution system is taken as the research object, its supercritical reduced-order model is also established, and the effect of constant power load (CPL) on the system stability is also studied. The negative incremental resistance of CPL will lead to the voltage oscillation and instability of the system, which will adversely affect the stable operation of the system. For this reason, a stabilization control method which can improve the voltage stability of MVDC distribution system is proposed in this paper. The position of the dominant pole in the s-domain plane can be changed, which is due to the decentralized and flexible design of key control parameters in state feedback control, droop control and voltage control, and the stability of MVDC distribution system is improved. The simulation results verify the rationality of the supercritical reduced-order model and the effectiveness of the stabilization control method based on Taylor expansion.