A third-order sliding-mode controller for DC/DC converters with constant power loads

Yue Zhao, W. Qiao
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引用次数: 22

Abstract

Incorporating a medium-voltage DC (MVDC) integrated power system is a goal for future surface combatants and submarines. In a MVDC shipboard power system, DC/DC converters are commonly employed to supply constant power to electric loads. These constant-power loads have a characteristic of negative incremental impedance, which may cause system instability during disturbances if the system is not properly controlled. This paper proposes a third-order sliding-mode controller (SMC) for DC/DC buck converters with constant-power loads. The SMC is able to stabilize the DC power systems over the entire operating range in the presence of significant variations in the load power and input voltage. The proposed SMC is validated by simulation studies in MATLAB/Simulink for stabilizing a DC/DC buck converter as well as a MVDC shipboard power system with constant-power loads for different operating conditions with significant variations in the load power and supply voltage.
恒功率负载DC/DC变换器的三阶滑模控制器
采用中压直流(MVDC)综合电力系统是未来水面战舰和潜艇的目标。在MVDC船舶电力系统中,DC/DC转换器通常用于向电力负载提供恒定功率。这些恒功率负载具有负增量阻抗的特性,如果系统控制不当,可能会导致系统在扰动期间不稳定。针对恒功率负载的DC/DC降压变换器,提出了一种三阶滑模控制器。SMC能够在负载功率和输入电压存在显著变化的整个工作范围内稳定直流电源系统。通过MATLAB/Simulink的仿真研究,验证了所提出的SMC在稳定DC/DC降压变换器和具有恒功率负载的MVDC船舶电力系统的不同工作条件下负载功率和电源电压的显著变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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