This article proposes an adaptive coordinated control strategy for the networked AC/DC microgrids (MGs) to enhance the frequency and dc voltage stability of the system while keeping proper power sharing. First, a control strategy based on the synchronverter and virtual dc machine (VDCM) for the converters connecting the AC and DC MGs is proposed, which is consisted of an adaptive virtual governor and an adaptive virtual inertia regulator besides the power sharing controller. Following, in order to enhance the system stability performance, the parameter design approach of the adaptive virtual inertia and virtual governor-gain is proposed accordingly, in which the adaptive virtual inertia and virtual governor-gain are comprehensively determined by the frequency and/or dc voltage, virtual rotor speed, and rate of change of the frequency (ROCOF) and/or dc voltage (ROCOV). After that, the small-signal stability analysis of the networked AC/DC MGs with the proposed control strategy is investigated to guide the design and selection of control parameters. Finally, simulation and experimental results demonstrate that the proposed method improves the frequency/dc voltage nadir and dynamic performance of the system.

中文翻译：

---

具有自适应虚拟惯量和调速器增益的联网AC / DC微电网的协调控制，以增强稳定性

本文针对网络AC / DC微电网（MGs）提出了一种自适应协调控制策略，以提高系统的频率和直流电压稳定性，同时保持适当的功率共享。首先，提出了一种基于同步器和虚拟直流电机（VDCM）的控制策略，用于连接交流和直流MG的转换器，该策略由功率分配控制器之外的自适应虚拟调节器和自适应虚拟惯性调节器组成。其次，为提高系统的稳定性能，提出了自适应虚拟惯性和虚拟调速器增益的参数设计方法，其中自适应虚拟惯性和虚拟调速器增益由频率和/或直流电综合确定。电压，虚拟转子速度，频率（ROCOF）和/或直流电压（ROCOV）的变化率。然后，研究了带有所提出的控制策略的网络AC / DC MG的小信号稳定性分析，以指导控制参数的设计和选择。最后，仿真和实验结果表明，该方法提高了系统的频率/直流电压最低点和动态性能。