第4卷第12期 2016年12月
DOI: 10.14171/j.2095-5944.sg.2016.12.001
智能电网 Smart Grid
文章编号：2095-5944 (2016)12-1163-08
中图分类号：TM76
Vol. 4 No. 12 Dec.2016
文献标志码：A
基于分散储能的配电网电力电子变压器高质量
供电研究
周柯1，王斌2，熊诵辉3，兰征3
（1.国网广西电网有限责任公司电力科学研究院，广西壮族自治区南宁市530023； 2.国网广西电网有限责任公司北海供电局，广西壮族自治区北海市536000；
3.湖南大学电气与信息工程学院，湖南省长沙市410082)
StudyonHighQualityPowerSupplyofPowerElectronicTransformerWith
Decentralized Energy Storage
ZHOUKe',WANGBin’,XIONG Yonghui',LAN Zheng
(1. Electric Power Research Institute of Guangxi Electric Power Co., Ltd. Nanning 530023, Guangxi Zhuang Autonomous Region, China; 2. State Grid Guangxi Power Grid Co., Ltd. Beihai Power Supply Bureau, Beihai 536000, Guangxi Zhuang Autonomou Region, China; 3. School of Electrical and Information Engineering, Changsha University of Science & Technology, Changsha
410082, Hunan Province, China)
ABSTRACT: With the rapid development of power distribution network, the traditional power distribution network has gradually shifted from passive mode to active mode. As the interface between the power distribution network and the users, power electronic transformer (PET) plays an important role in active control and dynamic management, such as controlling power flow and power quality, ctc. In order to improve the quality of power supply, minimize the influence of power supply failure on the users, and on the basis of cascaded modular PET, this paper proposes a topology structure which is based on decentralized energy storage PET. The scattered energy storage unit whose capacity is small connects with cascaded modules respectively, avoiding some disadvantages of using large capacity battery in the output of the PET. For the new topology structure which is based on decentralized energy storagc PET, this paper presents a control strategy of charging and discharging management which depends on the state of charge of energy storage unit. This control method can maintain the DC side voltage balance and power split balance under the bad operating condition of power distribution network so that the new PET can pass through the deep voltage drop and transient voltage interruption and realize the high reliable power supply. Simulation results prove the correctness and effectiveness of the proposed high power quality control strategy which is used for the proposed PET with decentralized energy storage.
KEY WORDS: power electronic transformer; decentralized energy storage; cascade rectification; power supply reliability; uninterrupted power supply
摘要：电力电子变压器可以作为配电网与用户的接口，对潮流和电能质量等因素进行主动控制，从而应用在从被动模式转变为主动模式的配电网中，为进一步提升供电质量，减少供电故障对用户的影响，提出一种基于分散储能的电力电子变压器拓扑结构，采用小容量储能单元与各个级联模块分散连接，避免电力电子变压器输出端使用大容量电池带来的弊端。在储能建模与充放电工作机理分析的基础上，进一步提出基于储能单元电荷状态的充放电管理控制策略，可以在配电网故障情况下维持电力电子变压器输出侧电压稳定，使电力电子变压器能够穿越配电网电压深度跌落和短时中断，实现对用户的高可靠供电。
仿真结果也证明所提基于分散储能的电力电子变压器拓扑结构及其高电能质量控制策略的正确性。关键词：电力电子变压器：分散储能：级联整流：供电可靠性：不间断供电
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引言
电力电子变压器(power electronictransformer，基金项目：广西电网公司科技项目《配电网智能电力电子变压器关
键技术研究与应用》研究成果。万方数据
PET)是一种新型电能变换装置。随着配电网技术的快速发展，传统配电网已遂渐从被动模式向主动模式转变。电力电子变压器(PET)可以作为主电网与低压配电网的接口，实现高效电压转换和能量传递。相比于传统变压器，PET具有很多优势，如采