A hybrid ac/dc microgrid, which consists of alternating current (ac) subgrid(s) and direct current (dc) subgrid(s), can efficiently integrate ac and dc loads, distributed generators (DGs) with minimum conversion stages. The ac and dc subgrids are connected by the bidirectional power converter (BPC) to realize power interaction between them. This paper proposes a decentralized economic operation control for the hybrid ac/dc microgrid, which aims to realize economic power sharing among all DGs and economic power interaction between subgrids. For the DGs, the nonlinear droop controls based on ac frequency-incremental cost and dc voltage-incremental cost are proposed, which can equalize DGs’ incremental costs autonomously, and hence decrease the subgrids’ generation costs with the equal incremental cost principle. For the BPC, the economic power interaction control is proposed to optimize the power interaction between the two subgrids and further decrease the total generation cost (TGC). In addition, the economic operation is categorized into different modes according to the load conditions. The hybrid microgrid with nonlinear incremental cost droops is modeled, and the overall stability analysis is conducted to ensure stable operation in all load conditions and modes. The performance of the proposed control is verified by the real-time hardware-in-loop (HIL) test.

中文翻译：

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AC / DC混合微电网的分散经济运行控制

由交流（ac）子电网和直流（dc）子电网组成的ac / dc混合微电网可以有效地集成交流和直流负载，具有最少转换级的分布式发电机（DG）。交流和直流子电网通过双向功率转换器（BPC）连接，以实现它们之间的功率交互。针对交流/直流混合微电网，提出了一种分散式的经济运行控制方法，旨在实现所有分布式电网之间的经济权力共享以及子电网之间的经济权力互动。针对分布式发电，提出了基于交流频率增量成本和直流电压增量成本的非线性下垂控制，它可以自主均衡分布式发电的增量成本，从而以相等的增量成本原理降低子电网的发电成本。对于BPC，提出了经济权力互动控制，以优化两个子电网之间的权力互动，并进一步降低总发电成本（TGC）。另外，根据负荷条件将经济运行分为不同的模式。对具有非线性增量成本下降的混合微电网进行建模，并进行整体稳定性分析以确保在所有负载条件和模式下均稳定运行。通过实时硬件在环（HIL）测试验证了所提出控件的性能。对具有非线性增量成本下降的混合微电网进行建模，并进行整体稳定性分析以确保在所有负载条件和模式下均稳定运行。通过实时硬件在环（HIL）测试验证了所提出控件的性能。对具有非线性增量成本下降的混合微电网进行建模，并进行整体稳定性分析以确保在所有负载条件和模式下均稳定运行。通过实时硬件在环（HIL）测试验证了所提出控件的性能。