考虑逆变类分布式电源特性的有源配电网反时限电流差动保护

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摘要

分析推导了有源配电网电流正序故障分量的分布特征,并基于正序故障分量提出了反时限电流差动保护方案。根据逆变类分布式电源(DG)故障后电流响应特征,建立了有源配电网正序故障分量复合序网,严格推导了保护区段两端电流正序故障分量计算表达式,定性分析了逆变类DG作用下区段两端电流正序故障分量的幅值和相位特征。以此为基础结合配电网特有的结构和参数特点,设计了反时限电流差动保护动作判据和整定方法。最后利用PSCAD建立有源配电网系统模型,对所提动作判据进行了仿真验证。结果表明,该保护方案可以有效区分电动机自起动过程和内部轻微故障,可以在保证对TA饱和足够制动能力的同时,提高保护灵敏度,且对有源配电网中DG出力随机性、馈线结构的多样性等具有较强的适应性。

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	李娟
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关键词 ：有源配电网, 逆变类DG, 不可测分支, 电流差动保护, 反时限

Abstract：

The positive-sequence fault components (PSFC) in the distribution network are analyzed and an inverse-time current differential protection scheme using the PSFC is discussed.According to the current responses of distributed generations (DGs) during fault,positive-sequence fault component complex network of short circuit fault is established.Secondly,the PSFC currents of two monitoring points of protection section are inferred rigorously.And the amplitude and phase characteristics of the PSFC current distribution are invested qualitatively.Combining with the configuration and parameters of the distribution networks,the inverse-time differential protection criterion and setting principle are proposed.Finally,simulations modeled by PSCAD are used to verify the effectiveness of the proposed protection criterion.Simulation results demonstrate that:(1) the scheme presented in this paper can distinguish motor self-starting and slight fault efficiently.(2) it can also solve the contradiction between enough ability for braking saturation current of the current transformer and improving sensitivity to internal faults.(3) it can adapt to multiple situations,e.g.output randomness of DG,variety configuration of feeders.

Key words： Active distribution network inverter-interfaced distributed generations unmonitored branch current differential protection inverse-time

收稿日期: 2016-01-22 出版日期: 2016-09-18

PACS:

TM773

基金资助:

国家高技术研究发展(863)计划重点项目(2012AA050213)、国家自然科学基金(51177096)和国网山东省电力公司科技项目(SGSDWF00YJJS1400563)资助。

作者简介: 李娟女,1987年生,博士研究生,研究方向为有源配电网保护与控制。E-mail:lijuandan@126.com;高厚磊男,1963年生,教授,博士生导师,研究方向为电力系统保护与控制。E-mail:houleig@sdu.edu.cn(通信作者)

引用本文:

李娟,高厚磊,朱国防. 考虑逆变类分布式电源特性的有源配电网反时限电流差动保护[J]. 电工技术学报, 2016, 31(17): 74-83. Li Juan, Gao Houlei,Zhu Guofang. Inverse-Time Current Differential Protection in Active Distribution Network Considering Characteristics of Inverter-Interfaced Distributed Generations. Transactions of China Electrotechnical Society, 2016, 31(17): 74-83.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I17/74

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