This article investigates the current sharing and voltage regulation problem of a DC microgrid by a distributed supervisory control method. In the existing secondary control methods, current sharing feedback control loop and voltage regulation feedback control loop are linearly integrated to shift the droop equation. However, the linear combination of two loops may easily offset the control effect of each other, as the control dimension is less than the objective dimension. This fact motivates us to design a distributed supervisory secondary control (DSSC) scheme to achieve a more flexible configuring of each converter. The DSSC consists of two candidate controllers and a supervisor. The two controllers refer to current sharing configuring and DC bus voltage regulation respectively, and the supervisor is to orchestrate the switching between candidate controllers based on the system environment of DC microgrid. Under the proposed DSSC, each converter selects to configure the current sharing or regulates the DC bus voltage according to its need. Theoretical stability analysis is rigorously conducted. Finally, both simulation and experiment results are presented to demonstrate the effectiveness of DSSC.

中文翻译：

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直流微电网的分布式监控二次控制


本文通过分布式监控方法研究直流微电网的均流和电压调节问题。在现有的二次控制方法中，均流反馈控制环路和电压调节反馈控制环路被线性集成以移动下垂方程。然而，由于控制维度小于目标维度，两个环路的线性组合很容易抵消彼此的控制效果。这一事实促使我们设计分布式监控二次控制（DSSC）方案，以实现每个转换器更灵活的配置。 DSSC 由两名候选控制员和一名主管组成。两个控制器分别指均流配置和直流母线电压调节，监控器根据直流微电网的系统环境协调候选控制器之间的切换。在所提出的 DSSC 下，每个转换器根据需要选择配置均流或调节直流母线电压。严格进行理论稳定性分析。最后，仿真和实验结果证明了 DSSC 的有效性。