Z源逆变器高阶微分反馈控制研究

Research on higher-order differential feedback control of Z-source inverters

摘要:

以航空静止变流器控制为研究对象，针对传统两级逆变结构效率低且系统复杂以及死区效应带来的死区波形畸变问题，引入Z源逆变器设计航空静止变流器。针对Z源逆变器系统高阶且非最小相位造成的控制器设计复杂的问题，引入了一种基于高阶微分器的反馈控制策略，该控制策略利用高阶微分器对系统各阶状态变量进行估计，具有不依赖于精确系统模型的特点。仿真实验表明，将此反馈控制器用于Z源逆变器输出电压控制时能够有效跟踪给定输出电压，系统受到外部扰动时依然能保持良好的静态和动态性能，满足静变流器控制需求。

Abstract:

Taking aeronautic static inverter as the research object, the Z-source inverter is introduced to design aeronautic static inverter For its traditional two-stage structure with low efficiency and complex system and the waveform distortion caused by the dead zone effect. This paper introduces a feedback control strategy based on a high-order differentiator for the problem of complex controller design due to the high order and non-minimum phase of Z-source inverter system. The controller uses higher-order differentiators to estimate the system state variables at each order and does not depend on an exact system model. Simulation experiments show that this feedback controller can effectively track the given output voltage when used for Z-source inverter output voltage control, and maintain good steady-state and dynamic performance when the system is subject to external disturbances, meeting the aeronautic static inverter control requirements