Abstract
The series-connected system is widely used in the medium or high voltage applications. For the series-connected inverter system, the phase angle synchronization should be guaranteed to ensure the total output voltage. Usually, a centralized controller is used to send the same voltage command to each module downstream. In order to improve the flexibility and scalability of the modular system, a decentralized synchronization method is proposed in this letter. The synchronization principle, control strategy, and control parameter design guidance are introduced step by step. Finally, the performance of the proposed strategy is verified by a series-connected three-module inverters system.
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