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Distributed Optimal Power Sharing Strategy in an Islanded Hybrid AC/DC Microgrid to Improve Efficiency
IEEE Transactions on Power Delivery ( IF 4.4 ) Pub Date : 2022-08-09 , DOI: 10.1109/tpwrd.2022.3197434
Jae-Won Chang 1 , Suyong Chae 2 , Gyu-Sub Lee 3
Affiliation  

In an islanded hybrid ac/dc microgrid (IHMG), ac and dc subgrids are connected via interlinking converters (ICs). For reliable operation of an IHMG, achieving distributed generators’ power sharing (DGPS) throughout the entire IHMG and ICs’ power sharing (IPS) is the main objective in an IHMG. To improve efficiency of an IHMG, minimizing operating costs of DGs is required and thus cost-minimized DGPS needs to be achieved. Similarly, when multiple ICs operate in an IHMG, efficiency-maximized IPS can further improve the efficiency of an IHMG, as total loss of ICs can vary by the IPS ratios. Thus, this paper proposes a distributed power sharing strategy to achieve cost-minimized DGPS and efficiency-maximized IPS simultaneously, without any communication lines for DGs. Incremental cost-based droop controlled DGs and distributed controlled ICs are coordinated for cost-minimized DGPS and a distributed optimal power sharing method of ICs is proposed to achieve efficiency-maximized IPS. The proposed strategy secures both cost-minimized DGPS and efficiency-maximized IPS, with only sparse communication lines among ICs, thus resulting in a significant improvement in IHMG efficiency and reliability.

中文翻译:

孤岛混合 AC/DC 微电网中的分布式最优功率共享策略以提高效率

在孤岛式混合交流/直流微电网 (IHMG) 中,交流和直流子电网通过互连转换器 (IC) 连接。为了 IHMG 的可靠运行,在整个 IHMG 中实现分布式发电机的功率共享 (DGPS) 和 IC 的功率共享 (IPS) 是 IHMG 的主要目标。为了提高 IHMG 的效率,需要最小化 DG 的运行成本,因此需要实现成本最小化的 DGPS。同样,当多个 IC 在 IHMG 中运行时,效率最大化的 IPS 可以进一步提高 IHMG 的效率,因为 IC 的总损耗会因 IPS 比率而异。因此,本文提出了一种分布式电源共享策略,以同时实现成本最小化的 DGPS 和效率最大化的 IPS,而无需 DG 的任何通信线路。基于增量成本的下垂控制 DG 和分布式控制 IC 被协调用于成本最小化的 DGPS,并且提出了 IC 的分布式优化功率共享方法以实现效率最大化的 IPS。所提出的策略确保了成本最小化的 DGPS 和效率最大化的 IPS,IC 之间只有稀疏的通信线路,从而显着提高了 IHMG 的效率和可靠性。
更新日期:2022-08-09
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