一种基于自动换相技术的三相不平衡抑制方法
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摘要
农用配电网属于三相四线制系统,由于大量地使用单相负荷,导致三相负荷不平衡现象.针对三相负荷不平衡的问题,提出一种对农网中三相负荷进行平衡调节的自动换相装置及换相控制策略.换相装置由多组换相开关和一套监测控制系统组成,监测控制系统监测三相电流与负荷相关数据,并对母线的三相不平衡度进行分析.换相控制策略首先应用max-min准则对三相负荷进行调整,确定负荷的调整方案,其次将换相指令传达至换相开关执行换相操作,达到三相平衡状态,最后在算例中对换相前后的电流数据进行分析,验证换相控制策略的有效性.
The agricultural distribution network is a three-phase four-wire system.Due to the large-scale use of single-phase loads,the three-phase load imbalance occurs.Aiming at the problem of three-phase load imbalance,an automatic commutation device and commutation control strategy for balance adjustment of threephase load in rural power network are proposed.The commutation device is composed of multiple sets of commutation switches and a set of monitoring control system.Monitoring and control system monitors three-phase current and load related data,and analyzes three-phase imbalance of busbar.The commutation control strategy first applies max-min criterion to adjust the three-phase load,determines the load adjustment scheme,and secondly transmits the commutation command to the commutation switch to perform the commutation operation to reach the three-phase balance state.Finally,the current data before and after commutation are analyzed in the example to verify the effectiveness of the commutation control strategy.
The agricultural distribution network is a three-phase four-wire system.Due to the large-scale use of single-phase loads,the three-phase load imbalance occurs.Aiming at the problem of three-phase load imbalance,an automatic commutation device and commutation control strategy for balance adjustment of threephase load in rural power network are proposed.The commutation device is composed of multiple sets of commutation switches and a set of monitoring control system.Monitoring and control system monitors three-phase current and load related data,and analyzes three-phase imbalance of busbar.The commutation control strategy first applies max-min criterion to adjust the three-phase load,determines the load adjustment scheme,and secondly transmits the commutation command to the commutation switch to perform the commutation operation to reach the three-phase balance state.Finally,the current data before and after commutation are analyzed in the example to verify the effectiveness of the commutation control strategy.
引文
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[11]王芳尧,刘用森,张军财,等.基于改进粒子群算法的负荷不平衡调整策略[J].电气开关,2017,55(4):54-58.
[12]方恒福,盛万兴,王金丽,等.配电台区三相负荷不平衡实时在线治理方法研究[J].中国电机工程学报,2015,35(9):2185-2193.
[13]张万君,于庆广,崔玉东.电力系统负荷优化配置与转移的研究[J].电力电子技术,2009,43(5):45-47.
[14]张志华,李今宋,周捷,等.低压三相负荷不平衡治理控制策略研究[J].电气自动化,2016,38(2):69-71.
[15]满九方,郝全睿,高厚磊,等.基于MMC-UPFC对称分量控制的输电线路三相不平衡治理[J].中国电机工程学报,2017,37(24):7143-7153.
[16]许志荣,杨苹,张育嘉,等.考虑不平衡度约束的单三相混联多微网日前经济优化[J].电网技术,2017,41(1):40-47.
[2]王代弟.配电网三相不平衡问题的分析与研究[D].沈阳:沈阳工业大学,2007.
[3]王彪,郑涛,倪斌,等.计及三相负荷不平衡的农村低压配电网理论线损计算[J].电力科学与技术学报,2013,28(1):81-85.
[4]张五一,张言滨,刘华伟.配电网三相负荷不对称的线损分析[J].继电器,2007(7):24-27.
[5]苏海锋,赵可为,李岩,等.规模化电动汽车三相负荷平衡充电选线装置与仿真分析[J].电力自动化设备,2018,38(6):103-108.
[6]吴丽娜,邵龙,刘观起,等.含无功补偿装置的风电并系统暂态电压稳定性研究[J].电网与清洁能源,2014,30(9):66-71.
[7]张明江,纪延超,顾强.三相不平衡与无功功率的综合补偿方法[J].电网技术,2008,32(s1):20-23.
[8]黄国栋,杨仁刚,冯小明.三相不平衡负载无功补偿方法的研究[J].电测与仪表,2011,48(4):23-26.
[9]陆惠斌,徐勇,伍宇翔,等.基于换相技术的三相不平衡治理装置研究[J].电力电容器与无功补偿,2016,37(6):64-69.
[10]张明,谢珊珊,罗云峰.低压配电网三相负荷不平衡优化模型的研究[J].武汉科技大学学报,2015,38(1):59-62.
[11]王芳尧,刘用森,张军财,等.基于改进粒子群算法的负荷不平衡调整策略[J].电气开关,2017,55(4):54-58.
[12]方恒福,盛万兴,王金丽,等.配电台区三相负荷不平衡实时在线治理方法研究[J].中国电机工程学报,2015,35(9):2185-2193.
[13]张万君,于庆广,崔玉东.电力系统负荷优化配置与转移的研究[J].电力电子技术,2009,43(5):45-47.
[14]张志华,李今宋,周捷,等.低压三相负荷不平衡治理控制策略研究[J].电气自动化,2016,38(2):69-71.
[15]满九方,郝全睿,高厚磊,等.基于MMC-UPFC对称分量控制的输电线路三相不平衡治理[J].中国电机工程学报,2017,37(24):7143-7153.
[16]许志荣,杨苹,张育嘉,等.考虑不平衡度约束的单三相混联多微网日前经济优化[J].电网技术,2017,41(1):40-47.