基于级联多电平变换器的固态变压器冗余设计的容错控制研究

应用固态变压器的综合能源互联系统的可靠性与组成固态变压器的级联多电平变换器的可靠性紧密相关。冗余变换器模块的引入使得固态变压器具备了承受元件故障的能力，从而提高了固态变压器以及相关电网的可靠性。基于可用于综合能源系统以及主动配电网的固态变压器，提出了一种基于冗余子模块的容错控制策略。对几种冗余配置的容错控制策略以及运行原理进行对比研究，基于Saber仿真平台对由级联多电平变换器模块组成的单相九电平固态变压器进行建模，并对所提出的冗余子模块容错控制方法进行了仿真。其仿真结果证明所提出的冗余子模块容错控制策略可以减少故障引起的用户侧电力中断时间以及降低对固态变压器设备的损害。

Research on Redundancy Design for Fault-tolerant Control of Solid-state Transformer Based on Cascaded Multi-level Converter

The reliability of an integrated energy interconnected system applying a solid-state transformer(SST) is hi-ghly related to that of the cascaded multi-level converter which forms the same SST. With the introduction of redundant converter modules, the SST can withstand component failures, thus improving the reliability of the SST and the associated power grid. Based on an SST which can be applied in the integrated energy system and active distribution network(ADN), a fault-tolerant control strategy is proposed based on redundant sub-modules. After a comparative study on several fault-tolerant strategies for redundancy arrangement and the corresponding operation principles, a single-phase 9-lelve SST consisting of cascaded multi-level converter modules is modeled in the Saber simulation platform, and the proposed fault-tolerant control method for redundant sub-modules is simulated. Simulation results verify that the proposed strategy can reduce the customer''s power interrupt time and the consequent damages to the SST device.