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Recently, ordinary residential users&#x2019; tolerance for power outages has dropped much by the flourishing economy. To further improve the power supply reliability, a scheme of seamless closed-loop load transfer was proposed based on series compensation technology. For its field application, two points should be considered: 1) For the efficient utilization, the device is designed with high mobility. But its mobility is limited due to its power requirements and the usage of magnetic components. 2) The mobility leads to variable nodes interconnected each time, which puts forward high requirements for the control strategy. The following are proposed: 1) Proposing a novel control strategy based on online impedance estimation method to ensure the effectiveness of the mobile prototype in variable scenarios. 2) Employing modular design and series-parallel mode to reduce the individual cabinet&#x2019;s volume, while utilizing the short-term overload capacity of magnetic components to augment the power density. A mobile prototype is developed, and test results prove the effectiveness of the control strategy and the engineering feasibility of the prototype.

Control Strategy and Implementation of Seamless Closed-Loop Load Transfer Mobile Prototype for 400 V Distribution Network