基于电容补偿技术的电性源CSAMT高频供电研究
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摘要
在CSAMT勘查时,回路导线上的感性阻抗会随着发送信号频率的升高而增大,因此,当发电机供电电压和接地电阻一定时,供电电流会随着发送信号频率的升高而急剧下降,导致接收端接收到的信号变弱,影响了勘探效果。本文通过分析发送回路的阻抗特性及RCL串联谐振电路,对比发送回路不增加电容和增加不同容值电容的幅频特性仿真曲线,证明了在发送回路中增加不同容值的补偿电容可提高高频发送信号的发送电流。基于此,设计了带有电容补偿电路的电性源CSAMT发送机。发送机工作时,首先通过试供的方法确定发送回路的阻抗情况,然后在发送过程中根据发送信号频率自动调整电容补偿电路的开关,切换不同容值的补偿电容进入发送回路,实现高频区发送电流的有效增大。在野外施工时对该方案进行了初步验证测试,结果表明串入不同容值的电容后,高频区特定频点或频段信号的发送电流比没有串接电容提高明显。预期该方法可增强高频区信号的发送电流,提升CSAMT的观察数据质量。
In the CSAMT survey,the inductive on transmitting circuit wire increases with the increasing frequency of the transmitting signal. When the power supply voltage and grounding resistance is constant,the transmitting current will drop with the increasing frequency of the transmitting signal,so the received signal in the receiver becomes weak,and the exploration effect is seriously affected.In this paper,by analyzing the impedance characteristics of the transmitting circuit and RCL series resonant circuit and simulating the amplitude and frequency characteristic curve of transmitting circuit which adds the different value compensating capacitors,the authors proved that it is possible to increase the transmitting current of the high frequency signal by adding the different compensation capacitor in the transmitting circuit. On such a basis,the authors designed electrical source CSAMT transmitter based on compensation capacitors technology. Through the high and low frequency signal transmitting,the transmission circuit impedance is determined,then in the transmission process it can be sent with the signal frequency changes and the compensation capacitor is constantly adjusted to achieve effective increase of high frequency band send current. In the working process,first the test method is used to determine the impedance of the transmitting circuit,and then the transmitter will automatically adjust the capacitor compensation network switch with the changing of the frequency of the transmitting signal,the different compensation capacitors are switched into the transmitting circuit to achieve the transmitting current increases. The scheme was tested and verified in practice. The recorded data show that the current in the high frequency area is improved obviously after the compensating capacitor is connected in transmitting circuit. It is expected that this method will enhance the transmitting current of the high frequency area and improve the observation data quality of CSAMT.
In the CSAMT survey,the inductive on transmitting circuit wire increases with the increasing frequency of the transmitting signal. When the power supply voltage and grounding resistance is constant,the transmitting current will drop with the increasing frequency of the transmitting signal,so the received signal in the receiver becomes weak,and the exploration effect is seriously affected.In this paper,by analyzing the impedance characteristics of the transmitting circuit and RCL series resonant circuit and simulating the amplitude and frequency characteristic curve of transmitting circuit which adds the different value compensating capacitors,the authors proved that it is possible to increase the transmitting current of the high frequency signal by adding the different compensation capacitor in the transmitting circuit. On such a basis,the authors designed electrical source CSAMT transmitter based on compensation capacitors technology. Through the high and low frequency signal transmitting,the transmission circuit impedance is determined,then in the transmission process it can be sent with the signal frequency changes and the compensation capacitor is constantly adjusted to achieve effective increase of high frequency band send current. In the working process,first the test method is used to determine the impedance of the transmitting circuit,and then the transmitter will automatically adjust the capacitor compensation network switch with the changing of the frequency of the transmitting signal,the different compensation capacitors are switched into the transmitting circuit to achieve the transmitting current increases. The scheme was tested and verified in practice. The recorded data show that the current in the high frequency area is improved obviously after the compensating capacitor is connected in transmitting circuit. It is expected that this method will enhance the transmitting current of the high frequency area and improve the observation data quality of CSAMT.
引文
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[18]石福升.大功率多功能发射系统研究[J].地球物理学进展,2009,24(3):1109-1114.
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[20]薛开昶.地电场电性源发射机可靠性关键技术研究[D].长春:吉林大学,2015.
[21]刘俊峰,邓居智,张志勇,等.电性源发射端接地电阻的理论计算及影响因素分析[J].工程地球物理学报,2012,9(4):380-384.
[22]邱关源,罗先觉.电路(第五版)[M].北京:高等教育出版社,2006:281-285.
[23]广东意壳电子科技有限公司.Snubber[EB/OL].[2016-10-9].http://www. eaco. com/a/zhongwenban/wodechanpin/Snubber/.html.
[2]王显祥,底青云,唐静,等.三维地电结构下CSAMT分辨能力研究[J].地球物理学进展,2014,29(5):2258-2265.
[3]李帝铨,胡艳芳.强干扰矿区中广域电磁法与CSAMT探测效果对比[J].物探与化探,2015,39(5):967-972.
[4]胡瑞华,林君,孙彩堂,等.均匀大地CSAMT静态效应模拟及其特征研究[J].物探与化探,2015,39(6):1150-1155.
[5]李帝铨,胡艳芳.强干扰矿区中广域电磁法与CSAMT探测效果对比[J].物探与化探,2015,39(5):967-972.
[6]李建华,林品荣,张振海,等.甘肃柳园地区典型矿床的多功能电法应用试验[J].物探与化探,2016,40(4):737-742.
[7]卓贤军,底青云,张佳炜.谐波信号在人工源电磁法WEM中的应用[J].物探与化探,2013,37(5):830-833,838.
[8]陈光源,邓明,金胜,等.井地电磁发送机嵌入式人机交互软件设计[J].地球物理学进展,2016,31(5):2319-2325.
[9]王珺璐,王萌,李荡,等.磁化率对大地电磁响应的影响及其提取方法[J].物探与化探,2015,39(6):1292-1298.
[10]李荡,王珺璐,李勇,等. CSAMT发射系统抗干扰供电技术初步研究[J].物探化探计算技术,2016,38(2):175-179.
[11]余飞.高压大功率电磁发射机供电关键技术的研究[D].北京:北京工业大学,2013.
[12] Yu F,Zhang Y M. Modeling and control method for high-power electromagnetic transmitter power supplies[J]. Journal of Power Electronics,2013,13(4):679-691.
[13]真齐辉,底青云,王亚璐.大功率CSAMT发射机发射大电流的实现[A]//中国地球物理学会年会,2014.
[14]真齐辉,底青云,刘汉北.励磁控制的CSAMT发送机若干技术研究[J].地球物理学报,2013,56(11):3751-3760.
[15]万云霞,程德福,卢浩,等.混场源电磁探测仪器发射天线设计[J].吉林大学学报:工学版,2012,42(6):1432-1436.
[16]程德福,王君,李秀平,等.混场源电磁法仪器研制进展[J].地球物理学进展,2004,19(4):778-781.
[17]林品荣,郭鹏,石福升.大深度多功能电磁探测技术研究[J].地球学报,2010,31(4):149-154.
[18]石福升.大功率多功能发射系统研究[J].地球物理学进展,2009,24(3):1109-1114.
[19]石福升,刘莺莺,郭鹏.小功率智能多频发射系统研究与应用[J].物探与化探,2007,31(10):11-18.
[20]薛开昶.地电场电性源发射机可靠性关键技术研究[D].长春:吉林大学,2015.
[21]刘俊峰,邓居智,张志勇,等.电性源发射端接地电阻的理论计算及影响因素分析[J].工程地球物理学报,2012,9(4):380-384.
[22]邱关源,罗先觉.电路(第五版)[M].北京:高等教育出版社,2006:281-285.
[23]广东意壳电子科技有限公司.Snubber[EB/OL].[2016-10-9].http://www. eaco. com/a/zhongwenban/wodechanpin/Snubber/.html.