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Dual svpwm power control method for 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, and calculation Large amount of problems, to improve the conduction time is too long, eliminate even-order harmonics, save system resources

Active Publication Date: 2022-08-05
NORTHEASTERN UNIV LIAONING
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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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  • Dual svpwm power control method for bidirectional dc-dc full bridge circuit
  • Dual svpwm power control method for bidirectional dc-dc full bridge circuit
  • Dual svpwm power control method for bidirectional dc-dc full bridge circuit

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Embodiment Construction

[0023] As shown in the figure, after the square wave output by the full bridge is equivalent to the fundamental wave, the equivalent sine wave is controlled; when the triangular carrier (the modulation wave and the triangular carrier are crossed, the on-time of the switch tube is obtained, and then the circuit is made The output sine wave) vertex will be the modulation time T of the first half cycle a with T b Swap, so that the positive and negative half cycles of the output voltage are symmetrical, only the time of the positive cycle is calculated in a single cycle and the calculation of the negative cycle is discarded, and it is only calculated once in a single cycle;

[0024] The power output equation is:

[0025]

[0026] Among them, the input power on the primary side is Active power is The reactive power is k is the transformer ratio; ω is the rotational angular velocity; θ is the phase shift angle; j is the imaginary unit in the complex number; r 1 with r 2 ...

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Abstract

A dual SVPWM power control method for a bidirectional DC-DC full-bridge circuit belongs to the technical field of power electronics, and in particular relates to a dual SVPWM power control method for a bidirectional DC-DC full-bridge circuit. The invention provides a dual SVPWM power control method of a bidirectional DC-DC full bridge circuit. The invention includes the following steps: after the high-frequency square wave output by the full bridge is equivalent to the fundamental voltage of the voltage, the entire space where the high-frequency square wave voltage output by the full bridge is located is divided into sector I and sector II, and sector I is divided into sectors I and II. It is a bidirectional DC-DC full-bridge circuit that works in the [0, π] time period, and sector II is a bidirectional DC-DC full-bridge circuit that works in the [π, 2π] time period; for a given desired output vector voltage according to "V "Second balance" principle, the modulation time T of the sector is obtained a and T b ;Input triangular carrier and modulation time T for each sector a , T b , and the vector voltage output by the full-bridge circuit is the control signal of the switch tube when and when.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a dual 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 useful pulse width modulation (PWM) method. It is widely used in digitally controlled voltage source inverters. [0003] In the actual application of the bidirectional DC-DC converter, in the phase shift control, the control method is complicated, and the amount of calculation is large, which is not conducive to digital realization. Often under phase-shift control, a certain switching device of a certain bridge arm has a too long conduction time, and there is an imbalance of power and heat distribution. Therefore, a dual SVPWM power control method based on a bidirectional DC-DC converter is proposed. The modulation method is equivalent to the square wave voltage fundamental wave, so a...

Claims

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Application Information

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Patent Type & Authority Patents(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 LIAONING
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