A microgrid (MG) is an effective way to integrate various distributed generators (DGs) into a power distribution system. The synchronization of DG voltage with MG voltage is indispensable to prevent inrush currents before connection to a MG system and for working in parallel with other DGs in the MG. In the past, synchronization in terms of both phase and magnitude was realized using additional voltage sensors to measure the MG voltage. However, this increased the system cost. In this paper, a cost-effective synchronization strategy is proposed to allow a DG to connect with an islanded MG system without any additional voltage sensors. The feasibility and effectiveness of the proposed strategy were validated by experiment with a scaled-down islanded microgrid.

微电网（MG）是将各种分布式发电机（DG）集成到配电系统中的有效方法。DG电压与MG电压的同步是必不可少的，以防止在连接到MG系统之前以及与MG中的其他DG并联工作时产生浪涌电流。过去，通过使用额外的电压传感器来测量MG电压，可以实现相位和幅度方面的同步。但是，这增加了系统成本。在本文中，提出了一种经济高效的同步策略，以允许DG与孤岛MG系统连接，而无需任何其他电压传感器。通过按比例缩小的岛状微电网进行实验，验证了所提策略的可行性和有效性。