
2013年第7卷第2期 2013,Vol.7, No.2
南方电网技术
SOUTHERNPOWER SYSTEM TECHNOLOGY
文章编号:1674-0629(2013)02-0073-05
中图分类号:TN713
分布式电源与微电网
Distributed Generation & Microgrid
文献标志码:A
滤波器对分布式发电并网变压器绝缘寿命影响
LCL
刘晨曦",王晓涛2
(1.四川省电力公司阿坝电力有限青任公司,四川茂县623299; 2.东泰制药四川电力公司检修公司纬阳分部,四川绵阳621000)
摘要:为了研究分市式发电并网对并网变压器绝缘寿命的影响,设计了一个分布式并网发电系统和LCL滤波器,搭建了并网变压器的热效应模型和单位寿命模型,对使用LCL滤波器与否的情形所得到的谐波数据造行了分析计算,并通过MatLab/SimuLink对所建立的变压器热效应模型及单位寿命模型进行了仿真分析,结果证明了所设计的分市式并网发
电系统经LCL滤减器滤波后能有效降低并网变压器绝缘的退化及其单住寿命损失。关键词:分布式发电;谐波;LCL滤波器;变压器绝缘:单位寿命
The Impact of LCLFilter on the Insulation Life of Distribution
Generation-IntegratedTransformer
LIU Chenxi',WANGXiaotao
(1. Aba Limited Power Company Sichuan Electric Power Company, Maoxian Sichuan 623299, China:
2. Mianyang Branch of Sichuan Electric Power Company Maintenance Company, Mianyang Sichuan 621000, China)
Abstract: In order to study the impact of LCL filter on the insulation life of distribution generation-integrated transformer, designing a distribution generation system and a LCL filter, setting up a thermal effect model and a per unit life model for the integrated transformer, this paper deals with the harmonic data in both the cases of with and without the LCL, and makes simulations to these models with MatLab/simuLink. The results show that the degradation of transformer insulation and the loss of its per unit life are
reduced effectively as the LCL filter is installed between the distributed generation system and the transformer. Key words: distributed generation; harmonic; LCL filter, transformer insulation; per unit life
随着分布式可再生能源的规模化开发,对变压器的数量与质量的要求也会越来越高,特别是对其绝缴性能的要求。只要掌握了电力变压器的绝缘性能影响因素,就能对变压器进行合理的运行维护,从而直接影响变压器的使用寿命、安全运行及供电的可靠性)。本文所设计的分布式并网发电系统经并网变压器并人配电网,如图1所示。
400V母线
直流总线
负载
分布式电源
AC/DC DC/DC
逆变器津波器
10kv母线
变压器+
负款
图1分布式并网发电系统经并网变压器并网结构图 Fig- 1 The Structure Diagram of the Grid-Connected Distributed
Generation Systems by the Grid Transformet
1LCL滤波器的设计
本文所采用的带LCL滤波器的单相并网变器的结构图如图2所示:
万
0.
e
Va
e
RC-e
t
带有LCL滤波器的单相全桥并网逆变器结构图
图2
Fig. 2 The Structure Diagram of the Single-Phase Full-Bridge
Grid-Connected Inverter with LCL Fiter
该LCL滤波器各参数数值的设计需要相互配合。本文借鉴前人的研究成果,从系统角度出发,使滤波器总电感量、谐振频率、滤波电容和阻尼电