海洋可控源电磁发射机建模与控制方法

Modeling and A Control Method of Marine Controlled Source Electromagnetic Transmitter

海洋可控源电磁发射机是瞬变电磁勘探法的重要设备,针对一种以全桥直流变换器为拓扑结构的电磁发射机进行研究.为了设计这种电磁发射机,基于元件平均模型和能量守恒平均法,提出了非理想电磁发射机的大信号平均模型和交流小信号模型,同时,给出其峰值电流控制器的设计方法.通过对所提出的非理想模型的等效功率级传递函数和闭环输出阻抗进行详细的理论分析,完善了非理想模型,并说明了非理想模型的必要性和合理性.最后,实验结果验证了所提出的非理想模型的正确性和优越性.

Marine controlled source electromagnetic transmitter is a central device for transient electromagnetic method. An electromagnetic transmitter with topology of full-bridge DC converter is designed in this paper. Based on the switching element average model and the law of energy conservation,an averaging large signal non-ideal model and an AC small signal non-ideal model were proposed in order to design a marine controlled source electromagnetic transmitter with full-bridge DC converter as topology. Simultaneously,the design method of peak current control for the transmitter was obtained. The detailed theoretical analysis for equivalent power level transfer function and closed-loop output impedance of the proposed non-ideal model was presented. Finally,the correctness and superiority of the proposed model were further verified by the experimental results.