Design of large signal stabilization strategy for DC-DC converter in multi-electric aircraft DC power supply system

多电飞机直流供电系统DC-DC变换器大信号致稳策略设计

¹ School of Electric Engineering, Sichuan University, Chengdu 610041, China
² School of Automation, Northwestern Polytechnical University, Xi'an 710072, China
³ Northwest University of Political Science and Law, Xi'an 710100, China

Received: 11 March 2024

Abstract

A large number of constant power loads with negative impedance characteristics are connected to the power supply system of the multi-electric aircraft, which poses great threats to the system stability. In order to ensure the stability and reliability of the multi-electric aircraft power supply system, the negative impedance feature of constant power loads must be overcome. In this paper, a novel backstepping control strategy based on nonlinear disturbance observer is designed for source-side Buck-Boost converter in the DC power supply system of multi-electric aircraft. The average state space model is converted to Brunovsky standard form by feedback linearization method, furthermore, the disturbances and uncertainties of the system are estimated by using the observer technique. Then the estimations are used as feedforward signals to design a novel backstepping controller, which guarantees the stability of the regulated power supply system. Finally, the effectiveness of the control strategy is verified by simulations and experiments.

摘要

具有负阻抗特性的恒功率负载大量接入多电飞机直流供电系统, 对其稳定运行产生了巨大威胁。为保证多电飞机直流供电系统的稳定性与可靠性, 必须克服恒功率负载负阻抗特性带来的负面影响。针对多电飞机直流供电系统中源侧Buck-Boost接口变换器系统, 设计了一种新的基于非线性扰动观测器的反步控制策略。通过反馈线性化方法将平均状态空间模型转换为布鲁诺夫斯基标准形式; 利用观测器对系统存在的干扰和不确定性进行估计, 并将观测器估计作为前馈信号设计反步控制律, 保证了系统母线电压的大信号稳定; 通过仿真和实验等手段验证了该控制策略的有效性。