文章摘要
章坚民,相炜,罗刚,等.配电网30°相角差线路不停电转供的解决方案及关键分析[J].电力系统自动化,2018,42(1):74-81. DOI: 10.7500/AEPS20170425001.
ZHANG Jianmin,XIANG Wei,LUO Gang, et al.Solution and Its Key Issue Analysis for Load Transfer Without Power Interruption of Distribution Lines with 30° Phase Angle Difference[J].Automation of Electric Power Systems,2018,42(1):74-81. DOI: 10.7500/AEPS20170425001.
配电网30°相角差线路不停电转供的解决方案及关键分析
Solution and Its Key Issue Analysis for Load Transfer Without Power Interruption of Distribution Lines with 30° Phase Angle Difference
DOI:10.7500/AEPS20170425001
关键词: 配电网  负荷转供  30°相角差线路  合解环时间间隔  环流允许最大持续时间计算  仿真论证
KeyWords: distribution network  load transfer  distribution lines with 30° phase angle difference  time interval of loop closing-opening operation  maximum allowable time duration calculation of loop current  simulation based verification
上网日期:2017-11-14
基金项目:国家自然科学基金资助项目(51677047);已申请发明专利“一种配电线路30度相角差不停电快速解合环方法”
作者单位E-mail
章坚民 杭州电子科技大学自动化学院, 浙江省杭州市 310018 zhangjmhzcn@hdu.edu.cn 
相炜 杭州电子科技大学自动化学院, 浙江省杭州市 310018  
罗刚 国网绍兴供电公司, 浙江省绍兴市 312000  
朱炳铨 国网浙江省电力调度控制中心, 浙江省杭州市 310006  
谢栋 国网绍兴供电公司, 浙江省绍兴市 312000  
焦田利 杭州电子科技大学自动化学院, 浙江省杭州市 310018  
摘要:
      针对现实存在相当数量的配电网30°相角差线路的不停电转供难题,提出快速合解环以最大限度缩短环流持续时间、以断路器组顺序控制应对断路器解环拒动问题的解决方案。以实际网络为案例,首先,对故障和正常状态下30°相角差系统的环流特性进行了分析,得出了避免在系统最大运行方式下进行合解环操作则可以不考虑电动效应的结论。其次,对电网主设备热效应的环流允许持续时间、计及故障场景且不影响继电保护的环流越限最大持续时间进行了计算,两者小者可作为断路器组顺序控制的环流持续最大时间限制。然后,揭示了合环点两侧电压合环角、合解环间隔时间需要配合,才能得到最小合环电流。最后,对合解环的操作过电压影响进行了仿真论证,从而为基于高速通信和顺序控制的合解环自动化解决方案提供了关键计算支撑,并得到了试点成功案例验证。
Abstract:
      Aiming at the difficulties of load transfer without power interruption between two distribution lines with 30° phase angle difference which are existed in a fair amount in present power system in China, a scheme of fast closing and opening loop is proposed to shorten the duration of loop current, and the sequence control of pro-assigned circuit breaker group is proposed to copy with the possible refusing action of circuit breaker. Taking the real network as case study, firstly, the loop current characteristics under the fault and normal condition are analyzed. The electrodynamic force can be ignored if the corresponding power system is not working in its maximum operation mode. Secondly, the allowable loop current time duration of main electrical equipment to bear the thermal effect is estimated as well as the maximum duration of over limit loop current considering fault scenarios without affecting relay protection. And the minimum loop current time duration will be selected as the maximum operation time window for sequence control of pre-assigned circuit breaker group. Thirdly, it is revealed that the minimum loop current can be obtained under the coordinated selection between angle of voltage on two sides of the closing circuit breaker and the time interval of closing-opening of pre-assigned circuit breaker group. Finally, the overvoltage effect due to the loop closing-opening operation has been studied. The whole studies provide a calculation support for the proposed scheme of high-speed and sequence control automatic loop closing-opening to finish the load transfer without interruption operation, and it is proved by the pilot real applications.
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