Grid-side unit power factor control method for two-stage matrix converter

Abstract

The invention discloses a grid-side unit power factor control method for a two-stage matrix converter. The method is characterized by reconstructing a grid-side current, implementing amplitude tracking of a grid-side voltage by the reconstructed grid-side current based on a least mean square (LMS) algorithm, then implementing the closed-loop control over the current, taking the deviation between the reconstructed grid-side current and the grid-side voltage as the input of an integrator, and taking the output of the integrator as a correction value of the rectifier stage input current space vector modulation phase, and thus, compensating for the influence of system parameters on a grid-side power factor. The beneficial effects of the invention are that only the three-phase grid-side voltageand the one-phase grid-side current need to be detected, the hardware cost is reduced, off-line calculation of parameters is omitted, when the system parameters change, the LMS algorithm can achieveadaptive tracking of the amplitude, and the integrator achieves adaptive adjustment of a phase compensation angle and has good robustness.

Description

technical field [0001] The invention relates to a dual-stage matrix converter, in particular to a method for controlling the grid-side power factor of the dual-stage matrix converter, and belongs to the field of dual-stage matrix converter control. Background technique [0002] The matrix converter has the advantages of high power density, four-quadrant operation, sinusoidal input current, and adjustable input power factor. Voltage transfer ratio, etc. [0003] The two-stage matrix converter (Two-Stage Matrix Converter, TSMC) is derived on the basis of the traditional matrix converter (Conventional Matrix Converter, CMC). Compared with CMC, its topology is divided into rectification stage and inverter stage, so it not only inherits all the advantages of CMC, but also overcomes the shortcomings of CMC such as large clamping circuit and complicated commutation method, and can realize zero current commutation, which is It also makes TSMC have better development potential and ...

AI Technical Summary

Problems solved by technology

Among them, the current space vector control of the rectification stage only relies on the input voltage phase information to calculate the duty cycle of the rectification stage switch, which is an approximate open-loop control, and does not consider the phase of the input current is affected by the filter parameters and load. , so that the input current always leads or lags behind the grid voltage, and the unit power factor cannot be guaranteed

However, in the current research, there are few studies on the influence of system parameters on the power factor of the grid side.

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