Balanced current sharing and output voltage control of paralleled DC–DC converter modules are essential requirements for enhanced reliability and power capacity. These control goals are challenging due to the load, supply voltage, line impedance uncertainties, inter-couplings of the converters, and open circuit faults. To achieve these goals, this paper proposes two novel adaptive fuzzy backstepping control methods for two sets of paralleled DC–DC converters. The proposed controllers are exercised in a master–slave architecture. First, a master–slave adaptive fuzzy backstepping controller is suggested for a set of paralleled buck converters to deal with matched and mismatched uncertainties, and to ensure balanced current sharing. To counteract uncertainties, as well as interactions among the converters, adaptive fuzzy estimators are employed. However, the suggested control strategy is not applicable to the paralleled boost converters due to their non-minimum-phase nature. Therefore, a novel master–slave adaptive fuzzy backstepping controller with a conventional proportional-integral reference current generator is proposed to encompass paralleled boost converters. Moreover, a simple fault-tolerant structure is suggested to detect the open circuit faults and re-share the inductor currents. The stability of the proposed controllers is guaranteed through the Lyapunov stability theorem. The proposed adaptive fuzzy backstepping control strategies offer good output voltage quality and current sharing, despite the uncertainties, inter-couplings, and open circuit faults. Comparative simulations are carried out on sets of three paralleled buck and boost converters to demonstrate the effectiveness and performance of the new control methods.

并联DC-DC转换器模块的平衡电流共享和输出电压控制是增强可靠性和功率容量的基本要求。由于负载，电源电压，线路阻抗不确定性，转换器的内部耦合以及开路故障，这些控制目标具有挑战性。为了实现这些目标，本文针对两组并联的DC-DC转换器提出了两种新颖的自适应模糊反推控制方法。提议的控制器在主从架构中运行。首先，对于一组并联的降压转换器，建议使用主从自适应模糊反步控制器，以处理匹配和不匹配的不确定性，并确保均衡的电流共享。为了抵消不确定性以及转换器之间的相互作用，采用了自适应模糊估计器。但是，由于其非最小相位特性，建议的控制策略不适用于并联升压转换器。因此，提出了一种具有常规比例积分参考电流发生器的新颖的主从自适应模糊反步控制器，以包含并联的升压转换器。此外，建议采用一种简单的容错结构来检测开路故障并重新共享电感电流。通过Lyapunov稳定性定理可以保证所提出控制器的稳定性。尽管存在不确定性，内部耦合和开路故障，但所提出的自适应模糊反步控制策略可提供良好的输出电压质量和电流共享。