本文選題：電磁勘探 + 全橋變換器�。� 參考：《北京工業(yè)大學(xué)》2015年碩士論文

【摘要】：作為一種重要的海洋電磁勘探方法,海洋可控源電磁探測在固體礦產(chǎn)探測、海洋油氣勘探和海底工程評價中都發(fā)揮著非常重要的作用。它的基本原理是在海底的上方牽引一個能夠發(fā)射低頻率電磁脈沖信號的人工電磁場源,在人工電磁場源的上方或海洋底部投放電磁接收機陣列,海底地層受到人工電磁場的激勵從而產(chǎn)生電磁散射響應(yīng),電磁接收機采集電磁散射響應(yīng)所產(chǎn)生的相關(guān)響應(yīng)信息,最終通過電磁場源發(fā)射的信息和接收機采集的信息來處理和分析研究海底地層的相關(guān)電性特征。作為可控源電磁場的人工激勵場源,海洋可控源電磁發(fā)射機是可控源電磁探測方法的硬件基礎(chǔ)之一,也是整個海洋可控源電磁探測系統(tǒng)中的重要環(huán)節(jié)。本文對開關(guān)電源的常用拓撲結(jié)構(gòu)進行了理論分析與對比,根據(jù)各個拓撲的結(jié)構(gòu)特點及適用的功率范圍,本文獨創(chuàng)性地提出了雙交直整流+H橋逆變的主電路拓撲結(jié)構(gòu)并詳細論述了該結(jié)構(gòu)的優(yōu)越性,針對該主電路重要元器件的選型和計算給出了詳細的方案。同時,對硬開關(guān)技術(shù)和軟開關(guān)技術(shù)進行了對比與分析,并確定了采用硬開關(guān)技術(shù)對全橋變換器進行控制的技術(shù)方案。電源系統(tǒng)熱設(shè)計的優(yōu)劣決定著電源電氣性能的好壞,是電源設(shè)計中至關(guān)重要的一環(huán),本文對電路各部分的損耗做了詳細的理論計算并使用ICEPAK進行熱分析,對發(fā)射機在使用過程中的熱量及熱量的分布有一個清晰的認識;根據(jù)熱仿真結(jié)果設(shè)計了一套獨立的水冷循環(huán)系統(tǒng)。在大量實驗的基礎(chǔ)上所研發(fā)的6kW低壓大功率電磁發(fā)射機,通過在實驗室系統(tǒng)開環(huán)、閉環(huán)的實驗,驗證了系統(tǒng)的功率拓撲的正確性、控制方法的有效性。通過在天津海域的實驗驗證,證明了發(fā)射機的性能指標(biāo)完全符合要求,可以滿足海洋勘探的需求。
[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.
【學(xué)位授予單位】：北京工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P631.33

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相關(guān)期刊論文 前1條

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本文編號：1919894