Secondary control strategies in hybrid ac/dc microgrids have been conventionally designed independently for each side of the microgrid, neglecting the interaction between the ac and dc sides due to the power transferred through the interlinking converter. This has a negative effect on the power sharing and dynamic response of the system. In this article, a novel distributed secondary control strategy for hybrid ac/dc-microgrids is presented which coordinates the control actions of the ac and dc sides. The proposed control scheme simultaneously regulates ac-voltage magnitude and frequency, as well as the dc-voltage magnitude, by including the interlinking converters in the control strategy via a distributed consensus approach. This improves the power-sharing accuracy and secondary control restoration of the variables in both ac and dc sides of the microgrid. Moreover, the proposed methodology avoids the circulating currents which are typically produced in systems with multiple interlinking converters. Several simulation and experimental tests, such as load impacts and plug-and-play capability, are presented to validate the performance of the proposed control strategy using a 24-kW hybrid ac/dc-microgrid laboratory prototype.

中文翻译：

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基于共识的混合交流/直流微电网二次控制策略并进行实验验证


混合交流/直流微电网中的二次控制策略通常是针对微电网的每一侧独立设计的，忽略了由于通过互连转换器传输的功率而导致的交流侧和直流侧之间的相互作用。这对系统的功率共享和动态响应产生负面影响。在本文中，提出了一种用于混合交流/直流微电网的新型分布式二次控制策略，该策略协调交流侧和直流侧的控制行为。所提出的控制方案通过分布式一致性方法将互连转换器包含在控制策略中，同时调节交流电压幅度和频率以及直流电压幅度。这提高了微电网交直流侧的功率分配精度和变量的二次控制恢复。此外，所提出的方法避免了通常在具有多个互连转换器的系统中产生的循环电流。提出了一些模拟和实验测试，例如负载影响和即插即用能力，以使用 24 kW 混合交流/直流微电网实验室原型验证所提出的控制策略的性能。