Abstract
Marine electromagnetic transmitter transmits large power variable frequency electromagnetic wave to the seabed so as to obtain the submarine structure and mineral resources. The mathematical model of controlled source circuit needs to be established to realize closed loop control for increasing control precision and output transient performance of the electromagnetic wave. The operation process of controlled circuit is analyzed in continuous current mode, two equivalent switching states of controlled source circuit are obtained through the analysis of the different states of the switch in a switching period. A small signal equivalent model of the system is established using small ripple approximation. For high output voltage fluctuation problem in single loop control, double loop control strategy of voltage loop and current loop is designed. The simulation and experimental results show that, the system has the advantages of fast transient response speed and good regulation performance.
Highlights
The exploration and exploitation of marine resources has the high cost of drilling and investment risk
The marine controlled source electromagnetic detection has become one of the most important means to reduce the risk in deep-water drilling oil and gas resources for distinguishing between oil and water traps nature, exposing "the high impedance body" under the coverage [2]
Primary and secondary voltage and current waveforms of transformer in the marine electromagnetic detection transmitter controlled source circuit are shown in Fig. (13)
Summary
The exploration and exploitation of marine resources has the high cost of drilling and investment risk. The marine controlled source electromagnetic detection has become one of the most important means to reduce the risk in deep-water drilling oil and gas resources for distinguishing between oil and water traps nature, exposing "the high impedance body" under the coverage [2]. Marine controlled source electromagnetic detection system supplies the transmitter on the seabed by tug. Calculating the apparent resistivity and phase, or using directly the electric and magnetic fields detect distribution characteristics of the underground electrical. It can reveal the distribution of the underlying structure, oil and gas and other mineral resources [3]
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