Double SVPWM power control method of bidirectional DC-DC full-bridge circuit

A full-bridge circuit and power control technology, which is applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc., can solve unbalanced power and heat distribution, long conduction time, calculation Large amount of problems, to improve the effect of long conduction time, eliminate even harmonics, and save system resources

Active Publication Date: 2021-08-20
NORTHEASTERN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] In the actual application of bidirectional DC-DC converters, the phase-shifting control method is complicated, and the amount of calculation is large at the same time, which is not conducive to digital realization
Often under phase-shift control, there is a certain switching device of a certain bridge arm that conducts for too long, and there is an imbalance in power and heat distribution.

Method used

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  • Double SVPWM power control method of bidirectional DC-DC full-bridge circuit
  • Double SVPWM power control method of bidirectional DC-DC full-bridge circuit
  • Double SVPWM power control method of bidirectional DC-DC full-bridge circuit

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Embodiment Construction

[0023] As shown in the figure, after the fundamental wave equivalent of the square wave output by the full bridge is carried out, the equivalent sine wave is controlled; when the triangular carrier (the modulating wave is intersected with the triangular carrier, the conduction time of the switch tube is obtained, and then the circuit output sine wave) the peak will be the modulation time T of the first half cycle a with T b Interchange, so that the positive and negative half cycles of the output voltage are symmetrical, and only calculate the time of the positive cycle in a single cycle and discard the calculation of the negative cycle, and only calculate once in a single cycle;

[0024] The power output equation is:

[0025]

[0026] Among them, the input power of the primary side is The active power is The reactive power is k is the transformation ratio of the transformer; ω is the rotational angular velocity; θ is the phase shift angle; j is the imaginary unit in ...

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Abstract

The invention belongs to the technical field of power electronics, and particularly relates to a double SVPWM power control method for a bidirectional DC-DC full-bridge circuit. The invention provides the double SVPWM power control method of the bidirectional DC-DC full-bridge circuit. The method comprises the following steps that after high-frequency square waves output by a full bridge are subjected to voltage fundamental wave equivalence, the whole space where the high-frequency square wave voltage output by the full bridge is located is divided into a sector I and a sector II, the sector I is a time period when a bidirectional DC-DC full bridge circuit works in [0, pi], and the sector II is a time period when the bidirectional DC-DC full bridge circuit works in [pi, 2pi]; for a given expected output vector voltage, according to a ''volt-second balance'' principle, modulation time Ta and Tb of the sector is acquired; and a triangular carrier and modulation time Ta and Tb of each sector are input, and the vector voltage output by the full-bridge circuit is combined as a control signal of a sum time switch tube.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a double SVPWM power control method of a bidirectional DC-DC full bridge circuit. Background technique [0002] Space Vector Pulse Width Modulation (SVPWM) technology is a very practical pulse width modulation (PWM) method. It is widely used in digitally controlled voltage source inverters. [0003] In the actual bidirectional DC-DC converter application, the phase-shifting control method is complicated, and the calculation amount is large at the same time, which is not conducive to digital realization. Often under phase-shift control, there is a certain switching device of a certain bridge arm that conducts for too long, and there is an imbalance in power and heat distribution. Therefore, a dual-SVPWM power control method based on a bidirectional DC-DC converter is proposed. This modulation method equates the fundamental wave of the square wave voltage, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/08H02M1/088
CPCH02M3/33584H02M1/08H02M1/088
Inventor 宋崇辉王文文宋家祥刁乃哲孙先瑞赵青青陈庆邢旭进
Owner NORTHEASTERN UNIV
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