Abstract
Based on the topology and mathematical model of the three-phase voltage source PWM rectifier with LCL filter, the resonance produced by the LCL filter and the design method of filter parameters is analyzed. For the resonance problem of the LCL filter, a direct power control strategy of the LCL PWM rectifier based on power damping feedback is proposed. The double-loop control structure is constructed for the inner loop power and outer loop current. The virtual voltage source is constructed as equivalent to power damping in the power loop. The power loop of the output is adopted as a command value in the input current loop, and the current loop is designed to use deadbeat control to ensure the accuracy of current tracking. SVPWM is introduced in this novel direct power control method to generate PWM signals to drive the rectifier power switch and achieve a fixed switching frequency. The experimental results show that this proposed control method can achieve the unit power factor operation of the rectifier while it’s suppressing the resonance, and the system has a better dynamic and static performance.
Highlights
Three-phase pulse width modulation (PWM) rectifiers use the single inductor as a filter because the harmonics are generated when the power device is switched
The outer loop power and inner loop current are controlled by two loops, and various LCL filter active damping methods can be adopted for both loops
The experimental platform of the PWM rectifier system based on LCL filtering is built, shown in Fig. 12, to verify the effectiveness of the control method proposed in this paper and to compare it with the traditional direct power control
Summary
Three-phase PWM rectifiers use the single inductor as a filter because the harmonics are generated when the power device is switched. The direct power control (DPC) method directly controls the input power of the PWM rectifier, which has the advantages of high efficiency, fast response, good dynamic and static performance. It can realize unit power factor operation [16]. In [21], the idea of direct power control with the current loop and the existing active damping method is proposed, but it needs to be added to the extra sensors, and the system is less stable at the same time. The required PWM switch signal is obtained after adjustment In this method, the resonant is damped while the switching frequency is fixed, and the response speed of the system is improved by the direct control of the current. The system simulation model is built to verify its effectiveness
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