基于扫频法电容电流测量装置的研制
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摘要
近几年来随着城市电网的发展,供配电网中电缆线路日益增多或加长,使得电网对地电容电流随之增大,远远超过规程要求,需要装配消弧线圈。而准确测量系统对地电容电流是决定装设消弧线圈与否和正确选择消弧线圈容量的依据,也是消弧线圈准确补偿的依据。本文主要围绕系统对地电容电流测量展开研究。
本文首先对谐振接地系统的基本工作原理进行了深入的研究,对现有的用于各种自动跟踪消弧补偿装置的电容电流测量计算方法进行了综合的比较分析。分析表明扫频法测量系统电容电流具有较高的测量精度,并且适用于各种形式的消弧线圈,因此本文依据扫频法研制电容电流自动测量装置。基于扫频法电容电流自动测量装置包括扫频信号源和控制器两部分。扫频信号源是一个基于IGBT单相全桥逆变器,其主要功能是发出频率随时间变化的方波信号;控制器是在高性能单片机C8051F020基础开发的,实现数据采集、谐振点判断、结果显示和远程通讯等功能。
在PSCAD平台上搭建了的扫频法测量电容电流的仿真系统,验证了这种方法的可行性。在动模实验室对自动测量装置进行了试验,装置的测量误差在1%以内,10ms左右即可完成电容电流测量,表明基于扫频法电容电流自动测量装置具有很高的精度和良好的实时性。
Recently power cables in the distribution electric power network are used more than ever, and the capacitive current between lines and the ground is rose with the development of the city. It is recommended to install the Arc Suppression Coil when the capacitive current is greater than the permitted value 10 A in the distribution network. Just to know the exact value of capacitive current, the Arc Suppression Coil can do the right act.
The paper has carried on deep studies to resonance ground system and compensation principles and analyzed various methods of capacitive current calculation of the automatic Arc Suppression Coil. The method of scanning frequency has been shown that it is more accurate than others and it can be used for all kinds of the Arc Suppression Coils, so the method of scanning frequency is chosen. The capacitive current measuring unit is composed of the signal generator and the controller. The signal generator is a voltage source inverter with IGBT, which produces square-wave output voltage with variable frequency. The four driving signals of IGBT are generated by the controller based micro-chip C8051F020. The controller is also used to sample the analog signals, to decide the resonance frequency, to show the result, and to communicate with computers.
The simulative system is carried on in PSCAD/EMTDC. It is shown that the method of scanning frequency is feasible. The test is conducted in the laboratory and the result of the experimentation show that the calculation the capacitive current is vary approach to the real capacitive current and the time of the whole course is only 10 ms.
本文首先对谐振接地系统的基本工作原理进行了深入的研究,对现有的用于各种自动跟踪消弧补偿装置的电容电流测量计算方法进行了综合的比较分析。分析表明扫频法测量系统电容电流具有较高的测量精度,并且适用于各种形式的消弧线圈,因此本文依据扫频法研制电容电流自动测量装置。基于扫频法电容电流自动测量装置包括扫频信号源和控制器两部分。扫频信号源是一个基于IGBT单相全桥逆变器,其主要功能是发出频率随时间变化的方波信号;控制器是在高性能单片机C8051F020基础开发的,实现数据采集、谐振点判断、结果显示和远程通讯等功能。
在PSCAD平台上搭建了的扫频法测量电容电流的仿真系统,验证了这种方法的可行性。在动模实验室对自动测量装置进行了试验,装置的测量误差在1%以内,10ms左右即可完成电容电流测量,表明基于扫频法电容电流自动测量装置具有很高的精度和良好的实时性。
Recently power cables in the distribution electric power network are used more than ever, and the capacitive current between lines and the ground is rose with the development of the city. It is recommended to install the Arc Suppression Coil when the capacitive current is greater than the permitted value 10 A in the distribution network. Just to know the exact value of capacitive current, the Arc Suppression Coil can do the right act.
The paper has carried on deep studies to resonance ground system and compensation principles and analyzed various methods of capacitive current calculation of the automatic Arc Suppression Coil. The method of scanning frequency has been shown that it is more accurate than others and it can be used for all kinds of the Arc Suppression Coils, so the method of scanning frequency is chosen. The capacitive current measuring unit is composed of the signal generator and the controller. The signal generator is a voltage source inverter with IGBT, which produces square-wave output voltage with variable frequency. The four driving signals of IGBT are generated by the controller based micro-chip C8051F020. The controller is also used to sample the analog signals, to decide the resonance frequency, to show the result, and to communicate with computers.
The simulative system is carried on in PSCAD/EMTDC. It is shown that the method of scanning frequency is feasible. The test is conducted in the laboratory and the result of the experimentation show that the calculation the capacitive current is vary approach to the real capacitive current and the time of the whole course is only 10 ms.
引文
[1] 中华人民共和国电力部. DL/T 620《交流电气装置的过电压保护和绝缘配合》. 北京:中华人民共和国电力行业标准,1997.
[2] 要焕年,曹梅月.电力系统谐振接地. 北京. 中国电力出版社,2000
[3] Lian Hongbo,Yang Yihan,Zhu Xunkai.Research on the Compensate on Mode and New Principal-auxiliary Arc Suppression Coil in the Resonant Grounded System.International Conference an Power System Technology – POWERCON Singapore:2004.723～728
[4] 钟新华. 配电网电容电流估算公式修正. 电力建设,2004,Vol.25(5):23～26
[5] 吴峥嵘. 预调式和随调式消弧线圈暨铁磁谐振分析. 上海电力,2005,5:505～508
[6] 李锋,傅正财,江秀臣等. 调匝式消弧电抗器的自动调谐. 上海交通大学学报,1996,30(1):71～77
[7] 江宏伟,宋国富. 气隙调感式消弧线圈结构设计及计算. 变压器,2002,39(2):5～7
[8] 蔡旭. 新型偏磁式消弧线圈及其控制. 电力系统自动化,2002,26(10):32～34
[9] 刘和平. 新型快速可调消弧线圈接地系统研究:[博士学位论文]. 重庆:重庆大学,2004. 5～10
[10] Caixu. A new arc-suppression coil with magnetic bias and its characteristics analysis. Electrical Machines and Systems , 2003. ICEMS 2003. Sixth International Conference on Volume 21 Nov. 2003. 903～906
[11] Zeng Guohui,Zhang Xiubin,Zhang Feng.Study on a New Resonant Grounding System.Power Electronics and Motion Control Conference, 2004 IPEMC 2004. The 4th International,Volume 3. 2004:1717～1721
[12] Liu Yancun,Fu Chuang. Application of thyristor in auto-tuning arc suppression coils. Applied Power Electronics Conference and Exposition, 2005 APEC 2005. Twentieth Annual IEEE Volume 3. 2005:1811～1816
[13] Liu Yancun,Lu Tiecheng,Fu Chuang. Automatic Arc Suppression Equipment with Fast Response Based on TSC Control Technology. The 30th AnnualConference of the IEEE Industrial Electronics Society. Korea:Busan,2004. 520~523
[14] Xu Yuqin,Chen Zhiye. The method for automatic compensation and detection of earth faults in distribution network. Power System Technology, POWERCON 2002. International Conference on Volume 3, 13-17 ,2002. 1753～ 1757
[15] 邵剑.谐振接地系统电容电流测量方法的研究:[硕士论文]. 北京:华北电力大学,2003.13～15
[16] 赵牧函,纪延超. 消弧线圈自动调谐原理的研究. 电力系统及其自动化学报. 2002,14(4):50～54
[17] 连鸿波,裴扇鹏,曲轶龙等. 谐振接地电网的电容电流自动跟踪测量. 郑州大学学报(工学版),2005,26(2):51～54
[18] 曾祥君,尹相根,于永源等. 基于注入变频信号法的消弧线圈自动调谐新技术. 电力系统自动化,2000,5:38～41
[19] 曾祥君,尹相根,于永源等. 基于注入变频信号法的经消弧线圈接地系统控制与保护新方法. 中国电机工程学报,2000,20(1):29～32
[20] 朱彩虹,李玲玲,杨岐等. 补偿电网脱谐度自动测量系统. 中国仪器仪表,2001,3:29～32
[21] 李玲玲,孙鹤旭,王晓宏等. 谐振接地电力网自动调谐的新方法. 中国电机工程学报,2003,23(6):77～80
[22] 郭世明,黄念慈. 电力电子技术. 成都. 西南交通大学出版社. 2002
[23] 潘磊,姜学东,汪至中. 新型 IGBT/MOSFET 驱动模块 SKHI22A/B 及应用. 国外电子器件,2003,3:54～56
[24] 尹海,李思海,张光东. IGBT 驱动电路性能分析. 电力电子技术,1998,3:86～89
[25] 吴新科,姜三勇,鲁明明. 一种适用于桥式变化器的 IGBT 高频驱动电路. 电力电子技术,2002,36(5):72～74
[26] 马喜顺,陶庸. 高速 SoC 单片机 C8051F. 电子产品世界. 2002 (5):63～64
[27] 骆松洁,付梦印. C8051F 高速 SoC 在 GPS 导航系统中的应用. 微型机与应用. 2005 (1):25～28
[28] 宋明权,周纯杰,杨樊等. 基于 C8051F040 的 CAN 通讯接口的开发与应用. 计算机技术与自动化. 2005,24(1):42～45
[29] 黄颖,李瑞强,张鹿平. 基于 C8051F 的耐压及绝缘阻抗测试系统的设计. 微计算机信息. 2005,21(8-2):64～65
[30] 黄艳华,梅顺良. 一种大容量电缆自动测试仪的设计和实现. 微计算机信息. 2005,21(10-2):45～47
[31] 章勇高,宋平岗,高彦丽等. 光线连接在高压变频器中的应用研究. 电力电子技术. 2004,38(1):78～80
[32] 朱明林,朱子书. 接地变故障的计算和试验研究. 高电压技术,2000,26(3):54～56
[33] 平绍勋. 接地变压器及其容量计算方法. 变压器,2000,37(4):17～19
[34] 韩挺,胡德飞. Znyn 曲折接线接地变压器德原理及试验方法. 水利电力机械,2004,26(6):37～40
[2] 要焕年,曹梅月.电力系统谐振接地. 北京. 中国电力出版社,2000
[3] Lian Hongbo,Yang Yihan,Zhu Xunkai.Research on the Compensate on Mode and New Principal-auxiliary Arc Suppression Coil in the Resonant Grounded System.International Conference an Power System Technology – POWERCON Singapore:2004.723～728
[4] 钟新华. 配电网电容电流估算公式修正. 电力建设,2004,Vol.25(5):23～26
[5] 吴峥嵘. 预调式和随调式消弧线圈暨铁磁谐振分析. 上海电力,2005,5:505～508
[6] 李锋,傅正财,江秀臣等. 调匝式消弧电抗器的自动调谐. 上海交通大学学报,1996,30(1):71～77
[7] 江宏伟,宋国富. 气隙调感式消弧线圈结构设计及计算. 变压器,2002,39(2):5～7
[8] 蔡旭. 新型偏磁式消弧线圈及其控制. 电力系统自动化,2002,26(10):32～34
[9] 刘和平. 新型快速可调消弧线圈接地系统研究:[博士学位论文]. 重庆:重庆大学,2004. 5～10
[10] Caixu. A new arc-suppression coil with magnetic bias and its characteristics analysis. Electrical Machines and Systems , 2003. ICEMS 2003. Sixth International Conference on Volume 21 Nov. 2003. 903～906
[11] Zeng Guohui,Zhang Xiubin,Zhang Feng.Study on a New Resonant Grounding System.Power Electronics and Motion Control Conference, 2004 IPEMC 2004. The 4th International,Volume 3. 2004:1717～1721
[12] Liu Yancun,Fu Chuang. Application of thyristor in auto-tuning arc suppression coils. Applied Power Electronics Conference and Exposition, 2005 APEC 2005. Twentieth Annual IEEE Volume 3. 2005:1811～1816
[13] Liu Yancun,Lu Tiecheng,Fu Chuang. Automatic Arc Suppression Equipment with Fast Response Based on TSC Control Technology. The 30th AnnualConference of the IEEE Industrial Electronics Society. Korea:Busan,2004. 520~523
[14] Xu Yuqin,Chen Zhiye. The method for automatic compensation and detection of earth faults in distribution network. Power System Technology, POWERCON 2002. International Conference on Volume 3, 13-17 ,2002. 1753～ 1757
[15] 邵剑.谐振接地系统电容电流测量方法的研究:[硕士论文]. 北京:华北电力大学,2003.13～15
[16] 赵牧函,纪延超. 消弧线圈自动调谐原理的研究. 电力系统及其自动化学报. 2002,14(4):50～54
[17] 连鸿波,裴扇鹏,曲轶龙等. 谐振接地电网的电容电流自动跟踪测量. 郑州大学学报(工学版),2005,26(2):51～54
[18] 曾祥君,尹相根,于永源等. 基于注入变频信号法的消弧线圈自动调谐新技术. 电力系统自动化,2000,5:38～41
[19] 曾祥君,尹相根,于永源等. 基于注入变频信号法的经消弧线圈接地系统控制与保护新方法. 中国电机工程学报,2000,20(1):29～32
[20] 朱彩虹,李玲玲,杨岐等. 补偿电网脱谐度自动测量系统. 中国仪器仪表,2001,3:29～32
[21] 李玲玲,孙鹤旭,王晓宏等. 谐振接地电力网自动调谐的新方法. 中国电机工程学报,2003,23(6):77～80
[22] 郭世明,黄念慈. 电力电子技术. 成都. 西南交通大学出版社. 2002
[23] 潘磊,姜学东,汪至中. 新型 IGBT/MOSFET 驱动模块 SKHI22A/B 及应用. 国外电子器件,2003,3:54～56
[24] 尹海,李思海,张光东. IGBT 驱动电路性能分析. 电力电子技术,1998,3:86～89
[25] 吴新科,姜三勇,鲁明明. 一种适用于桥式变化器的 IGBT 高频驱动电路. 电力电子技术,2002,36(5):72～74
[26] 马喜顺,陶庸. 高速 SoC 单片机 C8051F. 电子产品世界. 2002 (5):63～64
[27] 骆松洁,付梦印. C8051F 高速 SoC 在 GPS 导航系统中的应用. 微型机与应用. 2005 (1):25～28
[28] 宋明权,周纯杰,杨樊等. 基于 C8051F040 的 CAN 通讯接口的开发与应用. 计算机技术与自动化. 2005,24(1):42～45
[29] 黄颖,李瑞强,张鹿平. 基于 C8051F 的耐压及绝缘阻抗测试系统的设计. 微计算机信息. 2005,21(8-2):64～65
[30] 黄艳华,梅顺良. 一种大容量电缆自动测试仪的设计和实现. 微计算机信息. 2005,21(10-2):45～47
[31] 章勇高,宋平岗,高彦丽等. 光线连接在高压变频器中的应用研究. 电力电子技术. 2004,38(1):78～80
[32] 朱明林,朱子书. 接地变故障的计算和试验研究. 高电压技术,2000,26(3):54～56
[33] 平绍勋. 接地变压器及其容量计算方法. 变压器,2000,37(4):17～19
[34] 韩挺,胡德飞. Znyn 曲折接线接地变压器德原理及试验方法. 水利电力机械,2004,26(6):37～40