This paper proposes an observer-based control scheme for a three-phase differential boost inverter in a hybrid PV-battery system. In a conventional control scheme for three-phase differential boost inverter (DBI)-based PV system, the measurements of input inductor current and voltage across output capacitors are required for obtaining the desired voltage at the load end. In a typical three-phase differential boost inverter operation, four voltage sensors and seven current sensors are required to achieve the desired AC voltage. In this paper, an observer-based strategy for elimination of these sensors without compromising power quality is reported. For estimation of boost inverter inductor current and output capacitor voltage, only DC-link capacitor voltage and the load currents are measured. A super-twisting sliding mode observer is used for estimation of the states of the boost inverter. A comparative study between the first-order sliding mode observer and super-twisting sliding mode observer is also presented. The simulation and experimental results show that the proposed observer-based control scheme works satisfactorily under various operating conditions such as sudden change of load, changes in solar insolation, and also under unbalanced load conditions.

中文翻译：

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基于升压逆变器的混合光伏电池系统控制的超扭滑模观测器

本文提出了一种基于观测器的控制方案，用于混合光伏电池系统中的三相差分升压逆变器。在基于三相差分升压逆变器 (DBI) 的光伏系统的传统控制方案中，需要测量输入电感器电流和输出电容器两端的电压，以获得负载端所需的电压。在典型的三相差分升压逆变器操作中，需要四个电压传感器和七个电流传感器来实现所需的交流电压。在本文中，报告了一种基于观察器的策略，用于在不影响电能质量的情况下消除这些传感器。为了估算升压逆变器电感电流和输出电容器电压，仅测量直流母线电容器电压和负载电流。超扭曲滑模观测器用于估计升压逆变器的状态。还介绍了一阶滑模观测器和超扭曲滑模观测器的对比研究。仿真和实验结果表明，所提出的基于观测器的控制方案在各种工作条件下都能令人满意地工作，例如负载突变、太阳日照变化以及不平衡负载条件。