10kV配电网铁磁谐振及其抑制措施仿真研究及应用
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摘要
变电站的10 kV母线上常接有YN接线的电磁式电压互感器,在一定条件下容易发生励磁特性饱和从而与系统对地电容形成参数匹配,激发铁磁谐振,导致高压熔丝频繁熔断甚至损坏电压互感器,对系统的安全稳定运行造成严重影响。以山东省某变电站A为研究对象,利用电磁暂态分析软件ATP-EMTP建立仿真模型,对该变电站10 kV系统不同运行方式下的铁磁谐振及各种抑制谐振措施进行了相应的仿真计算,结果表明单相接地故障清除时易引起系统分频谐振,而在电压互感器中性点经消谐器接地或在电源侧变压器中性点经消弧线圈接地时,可以有效抑制系统的铁磁谐振。
The 10 kV bus of substation is usually connected with electromagnetic voltage transformer with YN connection.Under certain conditions,the saturation of excitation characteristics is easy to occur and the inductance parameter is matched to the ground capacitance of the system,which excites ferroresonance and causes the damage of the fuse or the voltage transformer,seriously affecting the safe and stable operation of the power system.In this paper,a substation A in Shandong province was taken as the research object,and the simulation models were established by using the electromagnetic transient analysis software ATP-EMTP.The ferroresonance of the 10 kV system under different operation modes and various measures to suppress the ferroresonance were simulated.The results show that the frequency-dividing resonance of the system can be easily caused when the single-phase grounding fault is removed.When the neutral point of voltage transformer is grounded by resonance eliminator or the neutral point of power transformer is grounded by arc suppression coil,the ferroresonance of the system can be effectively suppressed.
The 10 kV bus of substation is usually connected with electromagnetic voltage transformer with YN connection.Under certain conditions,the saturation of excitation characteristics is easy to occur and the inductance parameter is matched to the ground capacitance of the system,which excites ferroresonance and causes the damage of the fuse or the voltage transformer,seriously affecting the safe and stable operation of the power system.In this paper,a substation A in Shandong province was taken as the research object,and the simulation models were established by using the electromagnetic transient analysis software ATP-EMTP.The ferroresonance of the 10 kV system under different operation modes and various measures to suppress the ferroresonance were simulated.The results show that the frequency-dividing resonance of the system can be easily caused when the single-phase grounding fault is removed.When the neutral point of voltage transformer is grounded by resonance eliminator or the neutral point of power transformer is grounded by arc suppression coil,the ferroresonance of the system can be effectively suppressed.
引文
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[11]许志龙,黄建华,王大忠.10 kV电网TV铁磁谐振过电压数字仿真及研究[J].电力自动化设备,2001,21(2):27-29.
[2]翁利民,陈灵欣,靳剑峰.配电网电压互感器铁磁谐振的特点与抑制[J].电力系统保护与控制,2004,32(20):40-42.
[3]陈飞,田园.10 kV电压互感器高压熔丝频繁熔断的分析[J].高电压技术,2005,31(9):88-89.
[4]武万才,吴志勇,边疆,等.地区电网电磁式电压互感器烧损和高压熔丝熔断原因分析[J].高压电器,2011,47(3):87-92.
[5] SHOTT H S,PETERSON H A.Criteria for neutral stability of wye-grounded-primary broken-delta-secondary transformer circuit[J].Transaction on AIEE,1941,24(4):997-1002.
[6]王盛阳.配电网铁磁谐振过电压的研究[D].杭州:浙江大学,2016.
[7]王亮,施围,沙玉洲,等.采用4TV法的配电网中铁磁谐振的研究[J].高电压技术,2005,31(10):15-17.
[8]司马文霞,郭飞,杨庆,等.变电站铁磁谐振仿真分析及抑制措施研究[J].电力自动化设备,2007,27(6):22-26.
[9]周默,孙岩洲.电网中性点不同接地方式下铁磁谐振的消谐研究[J].高压电器,2015,51(1):80-85.
[10]张永胜,刘守豹.配电网铁磁谐振综合抑制措施研究[J].高压电器,2016,11(16):137-142.
[11]许志龙,黄建华,王大忠.10 kV电网TV铁磁谐振过电压数字仿真及研究[J].电力自动化设备,2001,21(2):27-29.