带恒功率负载的航空双向Buck-Boost三阶滑模控制

Three-order Sliding Mode Control of Bidirectional Aircraft Buck-Boost Converter with Constant Power Loads

为平抗航空电力系统中的恒功率负载的负阻抗特性影响,回收再利用恒功率负载的刹车制动能量,将机载单向DC/DC变换器改进为双向Buck-Boost结构。并针对双向Buck-Boost在传统的二阶滑模控制的基础上,提出其三阶滑模优化模型。在MATLAB中进行仿真实验,分析结果表明改进后的双向Buck-Boost变换器采用三阶滑模控制方式,在大扰动发生时有效限制了负载电压、电流响应峰值,系统具有良好的鲁棒性和优异的抗扰动性能。此设计方案为飞机电力系统中带恒功率负载的DC/DC变换器实施新的改进优化控制提供了理论依据。

To reduce the negative power characteristics of constant power loads in aircraft power system and recover their braking energy,a bidirectional Buck-Boost converter is modified from a unidirectional DC/DC converter. Based on the traditional secondorder sliding mode control,a three-order sliding mode control is proposed for the developed converter. Simulations in MATLAB Show that with the three-order sliding mode control,the bidirectional Buck-Boost converter effectively restrains the peak values of load voltages and currents when a large disturbance occurs,exhibiting good robustness and excellent anti-disturbance perfor-mance. The proposed scheme provides a theoretical basis for the implementation of an improved optimal control for the DC/DC converter which is connected to a constant power load in aircraft power system.