Abstract
The low-voltage and high-current permanent magnet synchronous generator (PMSG), which has characteristics of high power density, small size, and excellent energy saving, is representative of the generators. As a key module of the integrated DC output system of PMSG, the low-voltage and high-current rectifier module is also a nonlinear time-varying system that is readily influenced by parametric changes and external disturbances. Aiming at the shortcomings of traditional control strategies, this paper proposes a novel low-voltage and high-power rectifier module control strategy based on nonlinear feed-forward PID control. The controller has a wide range of environmental applications because of its greater robustness. At the same time, the introduction of feed-forward control shortens regulation time of the system. Therefore, the combination of the two control methods can improve the dynamic performance of the system without influencing the steady-state performance. The simulation model of an integrated rectifier system based on SVPWM control was constructed by Simulink, which can achieve a rated output of 5 V/300 A. At the same time, the simulation model of the controller is constructed and applied to the rectifier output system of a 5 V/300 A synchronous generator to complete the nonlinear feed-forward PID control. Through the comparison between simulation and experiment, it has been proven that the control method can effectively resist the load disturbances and improve the response speed of the system.
Highlights
In the fields of shipping, electrolysis and electroplating, direct current (DC) power supply is required to operate in low-voltage and high-current modes
The process of commutating the rectification current leads to the distortion of the alternating current (AC) voltage waveform, which leads to harmonic loss
For the convenience of the study, a single three-phase rectifier module is selected, which consists of the three-phase AC input voltage section, the rectification and filtering section, the phase locked loop section, and the double closed-loop control section
Summary
In the fields of shipping, electrolysis and electroplating, direct current (DC) power supply is required to operate in low-voltage and high-current modes. In electric propulsion systems, generators have an obligation to have lower-voltage and higher-power output characteristics due to the limitation of output voltage. The process of commutating the rectification current leads to the distortion of the alternating current (AC) voltage waveform, which leads to harmonic loss. Realizing that high performance and high-power DC power supply system is an issue has received considerable attention in recent years. Many scholars have conducted significant research and proposed various control methods that improve the problems. The methods include the PID control, the direct power control, the intelligent control, and the nonlinear PID control, etc
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