CN106877376A - 一种配电网反时限过电流保护 - Google Patents

一种配电网反时限过电流保护 Download PDF

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CN106877376A
CN106877376A CN201510914873.8A CN201510914873A CN106877376A CN 106877376 A CN106877376 A CN 106877376A CN 201510914873 A CN201510914873 A CN 201510914873A CN 106877376 A CN106877376 A CN 106877376A
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protection
time over
inverse time
current protection
distribution network
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魏莹
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    • H02J3/383
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02J3/386
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects

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  • Emergency Protection Circuit Devices (AREA)

Abstract

一种配电网反时限过电流保护,包括含分布式电源配电系统、通信系统和低电压加速反时限过电流保护三个部分。本发明提出低电压加速反时限过电流保护的配合方案。低电压加速反时限过电流保护应用到含DG的配电网中,可以加速反时限过电流保护的动作时间,尤其是改善了保护出口故障的动作时间,能够消除低电压加速因子对动作时限的影响,确保上下级保护动作时限的配合。方案的实施,可以有效改善反时限过电流保护在微电网中应用的动作特性以及保护之间的配合特性,具有良好的应用价值。

Description

一种配电网反时限过电流保护
所属技术领域
本发明涉及一种配电网的保护,尤其涉及一种配电网反时限过电流保护。
背景技术
随着电网智能化水平的提升,微电网技术得到了迅速的发展,包括光伏电池发电、风力发电、储能技术等分布式发电DG(DistributedGeneration)在配电网中得到了广泛的应用。微电网由负荷、微型电源和储能装置构成,可同时提供电能和热能,微电网内部电源主要由电力电子器件负载能量转换,并提供必要的控制及接口。微电网可分为交流和直流2类,由于传统大电网以交流形式存在,导致目前研究较多的是交流微电网。但是相比交流微电网,直流微电网不存在相位同步、谐波和无功功率损耗等方面问题,因此其研究得到了重视。
与传统配电网相比,含有微电源、线路与负荷的配电网具有一定的独立运行能力,但微电源的存在、复杂的故障特性等均给原有保护配置带来了新的问题,使得传统的配电网继电保护不再适用。结合微电网结构和故障特点提出了一种基于负荷阻抗的微电网反时限低阻抗保护,但该保护实现复杂,可靠性较低。
本发明提了适用于含DG配电网的反时限过电流保护方案,保护方案的实施,可以有效改善反时限过电流保护在微电网中应用的动作特性以及保护之间的配合特性,具有良好的应用价值。
发明内容
为了克服含DG配电网的反时限过电流保护中存在的难题,本发明提出一种配电网反时限过电流保护。
本发明解决其技术问题所采用的技术方案是。
反时限过电流保护的动作时间与被保护线路中的故障电流大小有关,它是利用继电器的反时限动作特性构成的,为了保证各保护之间动作的选择性,其动作时限逐级配合。
一种配电网反时限过电流保护,包括含分布式电源配电系统、通信系统和低电压加速反时限过电流保护三个部分。
所述含分布式电源配电系统包括系统电源、分布式电源和三段保护三个部分。
所述通信系统借助通信信道传递DG提供的短路电流信息,可以实现DG上、下级保护的有效配合。
所述低电压加速反时限过电流保护引入低电压加速因子,使得反时限过电流保护在时限上能够很好地配合。
本发明的有益效果是:本发明提出了低电压加速反时限过电流保护的配合方案。低电压加速反时限过电流保护应用到含DG的配电网中,可以加速反时限过电流保护的动作时间,尤其是改善了保护出口故障的动作时间,能够消除低电压加速因子对动作时限的影响,确保上下级保护动作时限的配合。方案的实施,可以有效改善反时限过电流保护在微电网中应用的动作特性以及保护之间的配合特性,具有良好的应用价值。
附图说明
图1含有分布式电源的配电系统结构。
图2低电压加速反时限过电流保护动作时间曲线。
具体实施方案
图1中,E为系统电源,DG为接入配电网的分布式电源。
(1)对于DG下游保护2和保护3,接入DG后该配电线路仍为单侧电源辐射状配电网络,按照传统的反时限过电流保护整定原则来进行整定,保护2和3的动作时间能够配合,满足继电保护对选择性和速动性的要求。
(2)对于DG上游保护1和下游保护2,接入DG后:当线路L2发生故障时,DG会向保护2提供助增电流IDG,流过保护2的故障电流Ik2为流过保护1的故障电流Ik1与IDG之和,大于Ik1,保护1和保护2的时间配合会受到影响;而流过保护1的故障电流和未接入DG时相比有所减小,保护1动作时间将延长,保护性能降低;当线路L1发生故障时,流过保护1的故障电流与DG支路无关。
借助通信信道传递DG提供的短路电流信息,可以实现DG上、下级保护的有效配合。在保护1和DG侧分别装设通信装置,借助通信信道,将DG侧的助增电流相量发送给主电源E侧保护1,流过保护1的故障电流加上接收到的DG的助增故障电流相量。作为保护1的反时限动作时间方程中的测量电流I。对于DG下游的保护2和保护3,接入DG前后,该配电线路均为单侧电源辐射状配电网络,不影响保护间的配合特性,可以按照传统的反时限过电流保护的整定原则整定。各段保护启动电流值为(i=2,3)。保护3在其出口处发生三相短路时,其动作时间整定为继电器的固有动作时间,则可以得到保护3的反时限动作时间常数。
引入加速因子后,在保护3出口发生三相短路时,保护2的动作时间比保护3高出,而在低电压加速因子的作用下,保护3瞬时动作,故保护2的动作时间为。对于DG上游的保护1,根据选择性的要求,一方面保护2出口三相短路时,保护1的动作时间要高出,而在低电压加速因子的作用下保护2可以瞬时动作,故保护1的动作时间为。在保护3出口三相短路时,保护1的动作时间要比保护3高出2,而保护3可瞬时动作,故保护1动作时间为2。
图2中,可以看出,在保护3出口三相短路时,保护2和3的动作时间差为,满足选择性的要求;而保护2、保护3出口三相短路时,保护1和保护2也能够配合,在其中一个短路位置处能够保证动作时间差最短。

Claims (4)

1.一种配电网反时限过电流保护,其特征在于:包括含分布式电源配电系统、通信系统和低电压加速反时限过电流保护三个部分。
2.如权利要求 1 所述的一种配电网反时限过电流保护,其特征在于所述含分布式电源配电系统包括系统电源、分布式电源和三段保护三个部分。
3.如权利要求 1 所述的一种配电网反时限过电流保护,其特征在于所述通信系统借助通信信道传递 DG 提供的短路电流信息,可以实现 DG 上、下级保护的有效配合。
4.如权利要求 1 所述的一种配电网反时限过电流保护,其特征在于所述低电压加速反时限过电流保护引入低电压加速因子,使得反时限过电流保护在时限上能够很好地配合。
CN201510914873.8A 2015-12-13 2015-12-13 一种配电网反时限过电流保护 Pending CN106877376A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109361198A (zh) * 2018-10-10 2019-02-19 上海交通大学 微电网多层级协同反时限线路保护方法与装置
CN111509683A (zh) * 2020-05-21 2020-08-07 南方电网科学研究院有限责任公司 一种配电网t接光伏接入后电流保护配置与整定方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109361198A (zh) * 2018-10-10 2019-02-19 上海交通大学 微电网多层级协同反时限线路保护方法与装置
CN111509683A (zh) * 2020-05-21 2020-08-07 南方电网科学研究院有限责任公司 一种配电网t接光伏接入后电流保护配置与整定方法
CN111509683B (zh) * 2020-05-21 2022-04-15 南方电网科学研究院有限责任公司 一种配电网t接光伏接入后电流保护配置与整定方法

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