Grid-side Power Factor Control Method of Dual-Stage Matrix Converter Based on Quasi-PR Control

Abstract

The invention discloses a method for controlling the power factor of the grid side of a two-stage matrix converter based on quasi-PR control. The closed-loop voltage control method normalizes the grid-side voltage and current, uses the quasi-PR controller to realize the normalized value of the grid-side current to track the normalized value of the grid-side voltage, and determines the parameters of the quasi-PR controller based on root locus theoretical analysis , so as to ensure that the system has a large stability margin and steady-state accuracy. The output of the controller is used as the current modulation vector on the input side of the dual-stage matrix converter, so that the grid-side voltage and grid-side current are in phase. Beneficial effects of the present invention: the rotation coordinate transformation is avoided, the amount of calculation is reduced, and the same performance as that of the PI control can be obtained; when the system parameters change, the adaptive adjustment of the current vector at the input side can be realized, thereby realizing the unit power factor at the grid side , with better robustness.

Description

technical field [0001] The invention relates to a dual-stage matrix converter, in particular to a quasi-PR control-based dual-stage matrix converter grid-side power factor control method, which belongs to the field of dual-stage matrix converter control. Background technique [0002] The two-stage matrix converter (Two-Stage Matrix Converter, TSMC) is derived on the basis of the traditional matrix converter (Conventional Matrix Converter, CMC). The DC link in the middle of the traditional AC-DC-AC converter is omitted, so the power density of the converter is improved to a certain extent. In addition, TSMC also has many advantages such as bidirectional energy flow, sinusoidal input current, and controllable input power factor. It has great development potential in many fields such as motor drive, power quality improvement and wind power generation. [0003] Its topology is divided into a rectification stage and an inverter stage. The rectification stage is a current source...

AI Technical Summary

Problems solved by technology

Regardless of which modulation strategy the rectifier stage adopts, the phase of its input current space vector comes from the phase of the grid-side voltage vector. In general, the phase of the grid-side voltage vector is directly used to replace the phase of the input-side current vector of the converter, so as to obtain the phase of the rectifier stage Switching duty cycle, but due to the existence of the input filter and changes in other system parameters, various reasons may cause the phase shift of the grid side current

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