A kind of dual output rectifier control method

Abstract

The invention provides a dual-output rectifier control method, which belongs to the field of power electronic converter control. The dual-output rectifier consists of 12 switching tubes, two filter capacitors and three filter inductors, and can provide two DC output voltage ports at the same time, that is, a low-voltage DC port and a high-voltage DC port. The control part of the dual-output rectifier includes a high-voltage control loop, a low-voltage control loop, a grid-side current control loop, high-voltage and low-voltage mode switching, and SPWM modulation. The maximum value in the absolute value of the phase voltage after normalization is compared to obtain the high and low voltage switching signal. The switching phase is determined according to the time of the high and low voltage switching signals, and the corresponding phase modulation wave is corrected according to the principle of inductive volt-second balance, so as to realize smooth switching between high and low voltage ports. The power distribution and control method of the dual-output rectifier proposed by the present invention can realize the power transfer from the AC side to the two DC ports, and the single-phase switching mode can reduce the complexity of switching between high and low voltage, and the control is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters and their control, and in particular relates to a control method for a dual-output rectifier. Background technique [0002] In recent years, with the development of power electronics technology, three-phase PWM rectifiers have gradually replaced uncontrolled rectifiers, and have been widely used in electric vehicles, new energy power generation, microgrids and other fields. The three-phase PWM rectifier is a typical power electronic converter that converts alternating current (AC) into direct current (DC), while the traditional three-phase PWM rectifier has only one DC voltage output port. In a microgrid system, multiple PWM rectifiers are usually required, which increases the cost and complexity of the system. [0003] For multi-output rectifiers, some literatures have proposed solutions. Y.Nishida et al. in "A new 3-phase buck-boost unity power factor rectifier with two ind...

AI Technical Summary

Problems solved by technology

The three-phase PWM rectifier is a typical power electronic converter that converts alternating current (AC) into direct current (DC), while the traditional three-phase PWM rectifier has only one DC voltage output port. In a microgrid system, multiple PWM rectifiers are usually required, which increases the cost and complexity of the system

W.-L.Ming et al. proposed a method by adding The N-line inductance is used to realize the two-way DC voltage output scheme. The N-line inductance added in this scheme must not only flow through the input current of the AC side, but also flow through the difference between the two DC load currents, so its inductance value is large. Increased volumetric weight of the system

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