Generating Mechanism and Suppression of Impulse Voltage on Secondary Bus of Marine Electromagnetic Transmitter

doi:10.16183/j.cnki.jsjtu.2022.403

Abstract

Abstract:

Electromagnetic detection is the main method of marine oil and gas resources exploration, and marine electromagnetic transmitter is the key equipment of marine electromagnetic detection system. At present, when the underwater towed body of the marine electromagnetic transmitter operates for a long time, the switch devices will be damaged. First, the commutation process of the transmitting bridge with unidirectional controlled-source circuit is analyzed. It is found that the feedback energy of the transmitting dipole parasitic inductor makes the secondary bus generate impulse voltage, which increases the voltage stress of the switch devices. Then, the operating mode of bidirectional controllable source circuit is analyzed, and a dual variable decoupling control strategy is proposed. Based on the model established at the front and back of the transformer, the original coupling nonlinear system is globally linearized into two single input single output systems, so as to obtain the functional relationship of the sliding mode controller. The simulation and experimental results show that the designed controllable source circuit can significantly reduce the impulse voltage of bus capacitor and the voltage stress of switch device, and improve the dynamic performance and efficiency of the system.

Key words: electromagnetic transmitter, bidirectional controlled-source circuit, impulse voltage, decoupling control

CLC Number:

TM464

TAO Haijun, DU Changshun, ZHANG Jinsheng, ZHENG Zheng. Generating Mechanism and Suppression of Impulse Voltage on Secondary Bus of Marine Electromagnetic Transmitter[J]. Journal of Shanghai Jiao Tong University, 2023, 57(12): 1597-1608.

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工作模式	功率下限	功率上限
模式1	0	1
模式2	-0.5	0.5
模式3	-0.5	0.5
模式4	-1	0

工作模式	开关管	约束条件	开关管	约束条件
模式1	Q₁、Q₂ Q₃、Q₄	i_L(t₀)≤0 i_L(t₄)≥0	Q₅、Q₈ Q₆、Q₇	i_L(t₂)≥0 i_L(t₅)≤0
模式2	Q₁、Q₂ Q₃、Q₄	i_L(t₀)≤0 i_L(t₅)≥0	Q₅、Q₈ Q₆、Q₇	i_L(t₄)≥0 i_L(t₆)≤0
模式3	Q₁、Q₂ Q₃、Q₄	i_L(t₀)≤0 i_L(t₅)≥0	Q₅、Q₈ Q₆、Q₇	i_L(t₁)≥0 i_L(t₄)≤0
模式4	Q₁、Q₂ Q₃、Q₄	i_L(t₀)≤0 i_L(t₄)≥0	Q₅、Q₈ Q₆、Q₇	i_L(t₅)≥0 i_L(t₂)≤0

参数	取值	参数	取值
U_in/V	500	L/μH	10
U_o/V	100	f/kHz	20
n	4.7	发射桥频率/Hz	50
C₂/μF	2 200	R_L/Ω	0.3
C₁/μF	30	L₁/mH	0.5

参数	取值	参数	取值
U_in/V	15	L/H	1×10^-5
U_o/V	15	n	1
C₁/μF	2 200	C₂/μF	2 200
f/kHz	20	发射桥频率/Hz	50
R_L/Ω	0.33	L₁/μH	500