Non-isolated staggered parallel control method and control device

Abstract

The invention discloses a non-isolated staggered parallel control method and a control device. The non-isolated staggered parallel control method comprise steps that: when an inductor of a three-phase full bridge staggered parallel circuit operates in a current continuous mode, three phases of voltages Va, Vb and Vc at the alternating current side and corresponding sectors are acquired; a switch state of each switch tube is determined according to the three phases of voltages Va, Vb and Vc at the alternating current side and the corresponding sectors; pulse-width modulated waves are sent to the switch tubes according to the three phases of voltages Va, Vb and Vc at the alternating current side and the corresponding sectors. According to the method and the device, not only can the maximum value of the common-mode circulation peak value be reduced, the dimension of the common-mode inductor is reduced, but also the differential-mode current is further reduced, the dimension of an EMC filter and the ripple current of a direct current side capacitor are reduced, moreover, the power fluctuation caused by discontinuous output current during sector switching in a control progress can be reduced.

Description

technical field [0001] The invention relates to the technical field of control, in particular to a non-isolated interleaved parallel control method and device. Background technique [0002] The traditional SVPWM (Space Vector Pulse Width Modulation, Space Vector Pulse Width Modulation) is based on the ideal flux circle of the three-phase symmetrical motor stator when the three-phase symmetrical sine wave voltage is supplied as the reference standard, and the different switching modes of the three-phase inverter are used as the reference standard. Appropriate switching to form a PWM (Pulse Width Modulation, pulse width modulation) wave, and use the formed actual flux vector to track its accurate flux circle. The traditional SPWM method starts from the point of view of the power supply to generate a sine wave power supply with adjustable frequency and voltage, while the SVPWM method considers the inverter system and the asynchronous motor as a whole. The model is relatively si...

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Problems solved by technology

[0005] The peak value of the common-mode circulating current generated by the traditional SVPWM wave transmission method is relatively large, resulting in a large size of the common-mode inductor; the differential-mode current generated by the traditional SVPWM wave transmission method is also large, resulting in the size of the EMC filter and the capacitance of the DC side. The ripple current is relatively large; the traditional SVPWM wave transmission method causes power fluctuations due to the discontinuity of the output current caused by sector switching during the control process

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