星形共直流母线多端口电力电子变压器多状态可靠性模型及应用

Multi-State Reliability Model and Its Application of Star Shaped Common DC Bus Multi-Port Power Electronic Transformer

星形共直流母线多端口电力电子变压器(star common DC bus multiport power electronic transformer,SBM-PET)各端口故障相互独立,具有多运行状态特点,目前缺少能有效表征其多状态可靠性的数学解析模型。为此提出一种SBM-PET多状态可靠性模型,并将其应用于交直流配电网可靠性评估。首先分析了SBM-PET结构及工作原理,根据SBM-PET各组成模块特点及故障影响范围对其进行功能模块划分,在此基础上考虑元件冗余配置建立SBM-PET各功能模块可靠性模型。然后根据SBM-PET各功能模块停运情况,基于马尔可夫过程建立SBM-PET多状态可靠性模型,求解SBM-PET不同状态下的概率、频率及平均持续时间可靠性指标,并基于此建立交直流配电网可靠性评估模型。最后算例分析计算了SBM-PET多状态可靠性及交直流配电网可靠性,结果验证了所提模型的有效性。

The faults at the ports of star common DC bus multi-port power electronic transformer(SBM-PET)are independent from each other and thus the SBM-PET has the characteristics of multiple operation state,but there is no mathematical analytical model that can effectively characterize its multi-state reliability.A SBM-PET multi-state reliability model is proposed and applied to the reli⁃ability evaluation of AC/DC distribution network.Firstly,the structure and working principle of SBM-PET are analyzed.The functional modules are divided according to the characteristics and fault influence range of each component module of SBM-PET.On this basis,considering the redundant configuration of components,the reliability model of each functional module of SBM-PET is established.Then,according to the outage of each functional module of SBM-PET,the multi-state reliability model of SBM-PET is established based on Markov process,the reliability indexes of probability,frequency and average duration time under different states of SBM-PET are solved,and the reliability evaluation model of AC/DC distribution network is established based on the solutions.Finally,the multi-state reliability of SBM-PET and the reliability of AC/DC distribution network are calculated by cases analysis,and the results verify the effectiveness of the proposed model.