| 引用本文: | 谢冰若,陈乔夫,程路,张宇,康崇皓.磁通可控消弧线圈对地电容检测方法的改进[J].电力自动化设备,2009,(3): |
| .Improved grid-to-earth capacitance measuring of arc suppression coil based on controllable magnetic flux[J].Electric Power Automation Equipment,2009,(3): |
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| 摘要: |
| 磁通可控消弧线圈采用变频信号注入法进行对地电容检测,当中性点位移电压较大时,逆变器输出的变频电流中将含有较强的工频干扰,不利于逆变器的稳定运行,也使得通过比较变频信号电流和电压相位判定谐振频率的方法准确率下降.将电压前馈控制引入数字PI控制器,使逆变器实时输出一个与工频干扰电压相同的电压以抵消其干扰作用,保证逆变器输出电流为一较理想的变频恒流源.同时,采用一种新型相量滤波技术滤除中性点位移电压中的工频分量而得到其变频分量,根据并联谐振时中性点变频电压最大的特征来判断谐振频率并计算出对地电容值.800 kV·A消弧线圈样机的实验结果表明,改进措施简便、有效,能够准确检测出不同中性点偏压下的对地电容值. |
| 关键词: 变频信号注入法 磁通可控 消弧线圈 电压前馈 相量滤波 |
| DOI： |
| 分类号:TM475 |
| 基金项目:国家自然科学基金? |
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| Improved grid-to-earth capacitance measuring of arc suppression coil based on controllable magnetic flux |
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XIE Bingruo,CHEN Qiaofu,CHENG Lu,ZHANG Yu,KANG Chonghao
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| Abstract: |
| The arc suppression coil based on controllable magnetic flux uses the variable-frequency current injection to measure the grid-to-earth capacitance. When the neutral displacement voltage is high,there is strong power-frequency interference in the output variable-frequency current of inverter,which goes against the stable operation of inverter and the precise detection of resonant frequency by comparing the phases of variable-frequency current and voltage. The neutral displacement voltage feed-forward contro... |
| Key words: variable-frequency current injection magnetic flux controllable arc suppression coil voltage feed-forward phasor filter |
