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海洋可控源电磁发射机的研究与实现

发布时间:2018-05-21 16:13

  本文选题:电磁勘探 + 全桥变换器 ; 参考:《北京工业大学》2015年硕士论文


【摘要】:作为一种重要的海洋电磁勘探方法,海洋可控源电磁探测在固体矿产探测、海洋油气勘探和海底工程评价中都发挥着非常重要的作用。它的基本原理是在海底的上方牵引一个能够发射低频率电磁脉冲信号的人工电磁场源,在人工电磁场源的上方或海洋底部投放电磁接收机阵列,海底地层受到人工电磁场的激励从而产生电磁散射响应,电磁接收机采集电磁散射响应所产生的相关响应信息,最终通过电磁场源发射的信息和接收机采集的信息来处理和分析研究海底地层的相关电性特征。作为可控源电磁场的人工激励场源,海洋可控源电磁发射机是可控源电磁探测方法的硬件基础之一,也是整个海洋可控源电磁探测系统中的重要环节。本文对开关电源的常用拓扑结构进行了理论分析与对比,根据各个拓扑的结构特点及适用的功率范围,本文独创性地提出了双交直整流+H桥逆变的主电路拓扑结构并详细论述了该结构的优越性,针对该主电路重要元器件的选型和计算给出了详细的方案。同时,对硬开关技术和软开关技术进行了对比与分析,并确定了采用硬开关技术对全桥变换器进行控制的技术方案。电源系统热设计的优劣决定着电源电气性能的好坏,是电源设计中至关重要的一环,本文对电路各部分的损耗做了详细的理论计算并使用ICEPAK进行热分析,对发射机在使用过程中的热量及热量的分布有一个清晰的认识;根据热仿真结果设计了一套独立的水冷循环系统。在大量实验的基础上所研发的6kW低压大功率电磁发射机,通过在实验室系统开环、闭环的实验,验证了系统的功率拓扑的正确性、控制方法的有效性。通过在天津海域的实验验证,证明了发射机的性能指标完全符合要求,可以满足海洋勘探的需求。
[Abstract]:As an important method of ocean electromagnetic exploration, ocean controlled source electromagnetic detection plays a very important role in solid mineral exploration, offshore oil and gas exploration and submarine engineering evaluation. Its basic principle is to pull an artificial electromagnetic field source over the sea floor that can transmit low-frequency electromagnetic pulse signals, and place an electromagnetic receiver array over the artificial electromagnetic field source or at the bottom of the ocean. The undersea strata are excited by the artificial electromagnetic field to produce electromagnetic scattering response. The electromagnetic receiver collects the relevant response information generated by the electromagnetic scattering response. Finally, the related electrical characteristics of the undersea strata are analyzed and analyzed through the information from the electromagnetic field source and the information collected by the receiver. As the artificial excitation field source of controllable source electromagnetic field, the marine controllable source electromagnetic transmitter is one of the hardware foundation of the electromagnetic detection method of controllable source, and it is also an important link in the whole ocean controllable source electromagnetic detection system. In this paper, the common topology of switching power supply is analyzed and compared theoretically, according to the characteristics of each topology and the applicable power range, In this paper, the topological structure of the main circuit of double alternating rectifier H-bridge inverter is presented, and the advantages of the structure are discussed in detail. The selection and calculation of the important components of the main circuit are given in detail. At the same time, the hard switching technology and soft switching technology are compared and analyzed, and the technical scheme of using hard switching technology to control the full-bridge converter is determined. The thermal design of the power system determines the electrical performance of the power supply and is a crucial link in the power supply design. In this paper, the loss of various parts of the circuit is calculated in detail and thermal analysis is carried out by using ICEPAK. There is a clear understanding of the heat and the distribution of heat during the use of the transmitter, and a set of independent water-cooled circulation system is designed according to the results of thermal simulation. On the basis of a large number of experiments, the 6kW low-voltage and high-power electromagnetic transmitter is developed. Through the experiments of open loop and closed loop in the laboratory system, the correctness of the power topology of the system and the effectiveness of the control method are verified. The experimental results in Tianjin sea area show that the transmitter performance meets the requirements and can meet the requirements of ocean exploration.
【学位授予单位】:北京工业大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:P631.33

【参考文献】

相关期刊论文 前1条

1 林品荣,赵子言;分布式被动源电磁法系统及其应用[J];地震地质;2001年02期



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