电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2014年
9期
103-109
,共7页
分布式电源%区域保护%故障馈线选择%故障定位保护%电流突变量
分佈式電源%區域保護%故障饋線選擇%故障定位保護%電流突變量
분포식전원%구역보호%고장궤선선택%고장정위보호%전류돌변량
distributed generators%regional protection%fault feeder selection%fault location protection%break-variable of current
分布式电源（DG）的接入改变了传统配电网的拓扑结构，网络中潮流方向及短路电流会随着 DG出力及负荷情况实时变化，这都给现有配电网的三段式电流保护带来了严重影响。随着 DG的大量接入及渗透率的提高，依靠单点故障信息的保护算法很难同时满足继电保护四性的要求。提出一种基于通信技术的区域保护新方案，对配电网进行区域划分，通过一次和二次两步定位确定故障区域实现保护。利用故障时变电所母线处Bus-IED（智能电子装置）及馈线上A类IED的故障电流正序分量信息完成一次定位；利用相应开关动作后A类IED或B类IED处的电流突变量信息实现二次定位。所提方案自适应区域划分算法简单，占用存储空间小，实现方便，直观性好。故障定位所需信息量小，可靠性高，适应性强。最后通过PSCAD/EMTDC仿真，验证了方案的正确性。
分佈式電源（DG）的接入改變瞭傳統配電網的拓撲結構，網絡中潮流方嚮及短路電流會隨著 DG齣力及負荷情況實時變化，這都給現有配電網的三段式電流保護帶來瞭嚴重影響。隨著 DG的大量接入及滲透率的提高，依靠單點故障信息的保護算法很難同時滿足繼電保護四性的要求。提齣一種基于通信技術的區域保護新方案，對配電網進行區域劃分，通過一次和二次兩步定位確定故障區域實現保護。利用故障時變電所母線處Bus-IED（智能電子裝置）及饋線上A類IED的故障電流正序分量信息完成一次定位；利用相應開關動作後A類IED或B類IED處的電流突變量信息實現二次定位。所提方案自適應區域劃分算法簡單，佔用存儲空間小，實現方便，直觀性好。故障定位所需信息量小，可靠性高，適應性彊。最後通過PSCAD/EMTDC倣真，驗證瞭方案的正確性。
분포식전원（DG）적접입개변료전통배전망적탁복결구，망락중조류방향급단로전류회수착 DG출력급부하정황실시변화，저도급현유배전망적삼단식전류보호대래료엄중영향。수착 DG적대량접입급삼투솔적제고，의고단점고장신식적보호산법흔난동시만족계전보호사성적요구。제출일충기우통신기술적구역보호신방안，대배전망진행구역화분，통과일차화이차량보정위학정고장구역실현보호。이용고장시변전소모선처Bus-IED（지능전자장치）급궤선상A류IED적고장전류정서분량신식완성일차정위；이용상응개관동작후A류IED혹B류IED처적전류돌변량신식실현이차정위。소제방안자괄응구역화분산법간단，점용존저공간소，실현방편，직관성호。고장정위소수신식량소，가고성고，괄응성강。최후통과PSCAD/EMTDC방진，험증료방안적정학성。
The connection of DG transforms topology structure of traditional distribution network, power flow direction and fault current changes in real time with DG contributions and load conditions. These factors will bring serious influence on three-phase current protection of prevailing system. As DG quantity grows and penetration rate improves, protection algorithm relying on the single point fault information can’t meet the four basic requirements of relay protection simultaneously. So that, this paper introduces a new regional protection scheme based on communication technology. The distribution network should be divided into distinct regions. The protection algorithm is composed of two steps:first and secondary fault locating to discover the fault section and achieve protection. We can utilize fault current positive-sequence component information from Bus-IED in substation and A-IEDs in feeder during fault periods to achieve first fault location, then take advantage of break-variable of current information from A-IEDs or B-IEDs after the corresponding breaker action to realize secondary fault location. In this scheme, adaptive region division has features of simple algorithm, small storage space, easy realization and good visibility. The advantages of fault location are little information, high reliability and good adaptability. Finally, simulation results from PSCAD/EMTDC verify the correctness of the method.
