The distributed control of dc microgrid requires communication of the voltage or per-unit current data between the neighboring nodes. This data is processed by the secondary controller to generate a reference for the primary controller. Any uncertainty in the communicated data leads to the oscillations in the dc bus voltage, disproportionate load sharing, or instability due to erroneous references generated. In this work, an ISMC based secondary controller is proposed, which tunes the voltage reference within the regulation range and also mitigates the bounded uncertainties in the communicated microgrid load data. The ISMC has the advantage of elimination of the reaching phase, as the desired node trajectories start from sliding manifold. This makes the secondary control robust throughout the operating range and facilitates proportional load sharing in uncertain operating conditions. The proposed secondary control compares the actual node parameters with the desired global reference values and generates the control signal, which is added with the primary controller's control signals. The proposed control methodology requires only local parameters for formulation. This eases the control design process. Further, a sliding mode control based primary control (SMPC) is proposed to regulate the voltage of a node and facilitate plug and play among the microgrid interfacing converters. The proposed robust SMPC has excellent control during load transients and plug-in and out of nodes from the dc bus. The proposed control is verified using simulations and experiments on a three-node dc microgrid.

中文翻译：

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直流微电网中基于自适应电压调整的负载分配

直流微电网的分布式控制需要相邻节点之间的电压或单位电流数据的通信。该数据由辅助控制器处理以生成主控制器的参考。通信数据中的任何不确定性都会导致直流总线电压的振荡、不成比例的负载分配或由于生成的错误参考而导致的不稳定。在这项工作中，提出了一种基于 ISMC 的二次控制器，它可以在调节范围内调整参考电压，并减轻通信微电网负载数据中的有界不确定性。ISMC 具有消除到达阶段的优点，因为所需的节点轨迹从滑动流形开始。这使得辅助控制在整个运行范围内保持稳健，并有助于在不确定的运行条件下按比例分配负载。建议的次级控制将实际节点参数与所需的全局参考值进行比较，并生成控制信号，该控制信号与初级控制器的控制信号相加。建议的控制方法只需要制定本地参数。这简化了控制设计过程。此外，提出了基于滑模控制的初级控制 (SMPC) 来调节节点的电压并促进微电网接口转换器之间的即插即用。建议的鲁棒 SMPC 在负载瞬变和从直流总线插入和拔出节点期间具有出色的控制。