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.

中文翻译：

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一种模块化串联逆变器的同步方法

串联系统广泛用于中压或高压应用。对于串联逆变系统，应保证相角同步，以保证总输出电压。通常，使用集中控制器向下游的每个模块发送相同的电压命令。为了提高模块化系统的灵活性和可扩展性，本文提出了一种分散同步的方法。分步介绍了同步原理、控制策略和控制参数设计指导。最后，通过串联的三模块逆变器系统验证了所提出策略的性能。