The interest in the integration of distributed power generation and microgrids into power grids has significantly increased. In this context, interfacing microgrids with a host grid is of significant relevance, and therefore, in this paper, a cost-effective controllable grid interface for microgrids is proposed, modeled, and studied under various conditions, including smooth and abrupt power fluctuations, faults, and interface tripping. The proposed interface, named Microgrid Connector Controller (MGC), is an adequate and affordable alternative to the existing Back-to-Back (B2B) microgrid-grid interface, at a fraction of its capital costs. Thus, the proposed MGC’s performance is compared a B2B interface through detailed time-domain simulations in a realistic benchmark test system to demonstrate the controller’s capabilities. Compared with B2B, MGC’s direct frequency synchronization and power and voltage control capabilities makes it easier for microgrid operators to satisfy required standards and reduce wear and tear in grid equipment and customer loads. Finally, the MGC’s lower voltage ratings may translate into significantly smaller size and thus easier logistics and lower costs.

中文翻译：

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微电网的有效可控电网接口


人们对分布式发电和微电网并入电网的兴趣显着增加。在这种背景下，微电网与主电网的接口具有重要意义，因此，本文提出了一种经济高效的微电网可控电网接口，并在各种条件下进行建模和研究，包括平滑和突然的功率波动、故障和接口跳闸。所提出的接口名为微电网连接器控制器 (MGC)，是现有背对背 (B2B) 微电网-电网接口的充分且经济实惠的替代方案，且资本成本仅为其一小部分。因此，通过在实际的基准测试系统中进行详细的时域模拟，将所提出的 MGC 的性能与 B2B 接口进行比较，以展示控制器的功能。与B2B相比，MGC的直接频率同步和功率电压控制能力使微电网运营商更容易满足要求的标准，并减少电网设备和客户负载的磨损。最后，MGC 较低的额定电压可能会导致尺寸显着缩小，从而更方便的物流和更低的成本。