Current-sharing control method and current-sharing control device for carrier phase-shifting parallel circuit

Abstract

The invention discloses a current-sharing control method and a current-sharing control device for a carrier phase-shifting parallel circuit. The current-sharing control method comprises the followingsteps: acquiring current of each phase of bridge arm; calculating the current change slope of each phase of bridge arm according to the PWM signal of each phase of bridge arm; and adjusting the duty ratio of the PWM signals output by the bridge arm according to the current change slope, so that the current of each phase of bridge arm is kept consistent. According to the embodiment of the invention, the current output state of each phase of bridge arm is finely adjusted according to the current change slope of each phase of bridge arm, so that output currents of all phases in the carrier phase-shifting parallel circuit can be kept completely consistent, the effect of current sharing control is achieved, the control precision of multi-phase currents in the carrier phase-shifting parallel circuit is guaranteed, and electric energy output by the carrier phase-shifting parallel circuit has high stability.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a current sharing control method of a carrier phase-shifting parallel circuit and a current sharing control device of a carrier phase-shifting parallel circuit. Background technique [0002] Since high-voltage frequency conversion and voltage modulation have become key technologies that affect the safety and stability of power systems, the carrier phase-shift modulation method has been rapidly developed, and the carrier phase-shift modulation method has been widely used. The principle is to use multiple H-bridge units to cascade multi-level control in advance, and each H-bridge unit adopts the switching frequency SPWM (Sinusoidal Pulse Width Modulation, sinusoidal pulse width modulation) modulation method; through the carrier phase-shift modulation method Each H-bridge can output a corresponding control signal, and further, output stable DC power after DC-DC...

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Problems solved by technology

[0006] In view of this, an embodiment of the present invention provides a current sharing control method for a carrier phase-shifting parallel circuit and a current sharing control device for a carrier phase-shifting parallel circuit, aiming at solving the problem of the traditional technical solution for each phase output in the carrier phase-shifting circuit. The sampling error of the current is large, and the carrier phase shift circuit cannot realize the current sharing control

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