多端口级联式电力电子变压器可靠性评估模型及其应用

杨汾艳; 李海波; 盛超; 黄辉; 熊天龙; 张小卉

引用本文:	杨汾艳,李海波,盛超,等.多端口级联式电力电子变压器可靠性评估模型及其应用[J].电力系统保护与控制,2019,47(20):41-49.
	YANG Fenyan,LI Haibo,SHENG Chao,et al.Reliability evaluation model of cascaded multiport power electronic transformer and its application[J].Power System Protection and Control,2019,47(20):41-49

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多端口级联式电力电子变压器可靠性评估模型及其应用
杨汾艳¹,李海波²,盛超¹,黄辉¹,熊天龙²,张小卉²
(1.广东电网有限责任公司电力科学研究院，广东广州 510080;2.清华四川能源互联网研究院，四川成都 610042)

摘要:

多端口级联式电力电子变压器(Power Electronic Transformer, PET)是未来实现多电压等级、交直流混联形态配电网的核心设备，其可靠性对于配电网可靠性水平影响较大。首先分析了多端口级联式PET典型拓扑结构及工作原理。其次基于工程可靠性原理研究建立了考虑器件冗余的PET可靠性评估模型。然后分析了PET对交直流混合配电网可靠性的影响。最后针对某“手拉手”结构交直流混合配电网进行算例分析。计算了PET不同设计模式、冗余度下的可靠性水平。进行了PET对交直流混合配电系统可靠性的影响及其灵敏度分析，验证了所提算法的正确性和有效性。

关键词: 多端口级联式电力电子变压器交直流混合配电网可靠性评估器件冗余

DOI：10.19783/j.cnki.pspc.181417

分类号:

基金项目:中国南方电网有限责任公司科技项目资助(GDKJQQ20161200)

Reliability evaluation model of cascaded multiport power electronic transformer and its application

YANG Fenyan¹,LI Haibo²,SHENG Chao¹,HUANG Hui¹,XIONG Tianlong²,ZHANG Xiaohui²

(1. Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China;2. Sichuan Energy Internet Research Institute, Tsinghua University, Chengdu 610042, China)

Abstract:

The cascaded multiport Power Electronic Transformer (PET) is a key equipment for future distribution grid with multi-voltage level and AC/DC hybrid feature, whose reliability has significant effect on the distribution grid reliability level. First, the typical topological structure and working principle of cascaded multiport PET are analyzed. Secondly, the reliability evaluation model for PET considering the device redundancy is established based on the engineering reliability theory. Then the effect of cascaded multiport PET on the AC/DC hybrid distribution network reliability is analyzed. Finally, the case studies are provided with a ‘hand in hand’ AC/DC hybrid power distribution network structure. The PET reliability levels under different design patterns and the redundancy levels are calculated. The influence of PET on reliability of AC/DC hybrid distribution system and its sensitivity analysis are carried out, which verifies the correctness and validity of the proposed algorithm. This work is supported by Science and Technology Project of China Southern Power Grid Co., Ltd. (No. GDKJQQ20161200).

Key words: cascaded multiport power electronic transformer AC/DC hybrid distribution network reliability evaluation device redundancy

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