This article presents a hybrid model predictive controller to ensure dc microgrid stability and enhance the performance of dc-dc boost converters interfaced with constant power loads (CPLs) in a hybrid system. Hybrid systems are dynamic systems with both continuous current mode and discontinuous current mode states. The main purpose in this article is to develop an advanced control technique for voltage regulation and stabilization of the converters in the presence of CPLs due to serious stability concerns, without considering the accurate modelling information of the system. In this regard, an automatic model, considering different modes of operation induced by semiconductor switches in dc-dc boost converters and highly non-linear nature of CPL is employed to design the proposed control approach. The non-linear CPL connected directly to a dc-dc boost converter is utilized to define an optimal tracking control problem by minimizing a finite-prediction horizon cost function, which is known as a finite control set MPC. The proposed controller, which is implemented in both continuous and discontinuous current modes, accounts for the regulation of output voltage within the predefined range. The effectiveness of the proposed hybrid model predictive control is verified using a comparative evaluation with discrete-time averaged model predictive control, continuous control set MPC, and the conventional PI control under experimental conditions. The results authenticate an improved dynamic performance, which can be applied to practical dc microgrids with CPLs.

中文翻译：

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具有恒定功率负载的DC-DC Boost转换器的混合模型预测控制

本文提出了一种混合模型预测控制器，以确保直流微电网的稳定性并增强混合系统中与恒定功率负载（CPL）相连的DC-DC升压转换器的性能。混合系统是具有连续电流模式和不连续电流模式状态的动态系统。本文的主要目的是开发一种先进的控制技术，用于由于严重的稳定性问题而在存在CPL的情况下实现转换器的电压调节和稳定，而无需考虑系统的准确建模信息。在这方面，考虑到由DC-DC升压转换器中的半导体开关引起的不同操作模式以及CPL的高度非线性特性，采用一种自动模型来设计所提出的控制方法。直接连接到DC-DC升压转换器的非线性CPL用于通过最小化有限预测范围成本函数（称为有限控制集MPC）来定义最佳跟踪控制问题。所提出的控制器在连续和不连续电流模式下均实现，可在预定范围内解决输出电压的调节问题。提出的混合模型预测控制的有效性通过使用离散时间平均模型预测控制，连续控制集MPC和常规PI控制在实验条件下的比较评估进行了验证。结果证明了改进的动态性能，可以将其应用于带有CPL的实际直流微电网。