为了改善电磁发射机的性能，减小电磁发射机的体积和质量，设计了一种基于脉冲宽度调制(PWM)整流技术的电磁发射机电路结构，并对其中永磁同步发电机(PMSG)的PWM整流器的控制结构和参数进行设计.在同步旋转坐标系下，建立PMSG中PWM整流器的数学模型；根据电动机双闭环调速理论设计了转子磁链定向的PWM整流器电压电流双闭环控制系统，以实现有功电流和无功电流的解耦控制；为了提高系统的动态性能和稳定性，提出PWM整流器比例积分(PI)控制器的参数整定方法.仿真和实验结果表明，采用PWM整流技术的电磁发射机不仅可以满足地球物理探测的实际需要，而且具有结构简单、功率因数高和电流谐波小等优点.所提出控制器设计方法能够确定PI参数，从而简化了系统设计.
In order to improve the power factor and power density of electromagnetic transmitter, and make the transmitter small in size and light in weight, a novel electromagnetic transmitter circuit based on pulse width modulation (PWM) rectifier is presented in this paper. Parameters for the permanent synchronous generator (PMSG) PWM rectifier in the transmitter are designed. First, the mathematical model of the PMSG PWM rectifier is established, and then based on the flux oriented control theory in motor speed control system, a double closed loop control strategy, which consists of a decoupling current controller and an outer voltage controller is proposed. The active and reactive current decoupling control is obtained. To improve the dynamic performance and stability of the PMSG PWM rectifier, parameters in the PI controller are designed. Simulation and experimental results show that the proposed transmitter can not only meet the needs of geophysical exploration, but also has the advantages of simple structure, high power factor and low current harmonics. The proposed design method of controller can effectively determine the PI parameters and simplify control system.
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