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Cascaded h-bridge pwm rectification system and its control method

A technology of rectification system and control method, which is applied in the direction of converting AC power input into DC power output, output power conversion device, electrical components, etc., and can solve problems that do not meet the high voltage range of the power system, large space volume and weight, and failure to reach capacity, etc. problem, to achieve the effect of increasing the equivalent switching frequency, simple control method, and reducing loss

Inactive Publication Date: 2019-09-13
HARBIN UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the rectification device composed of the existing three-phase rectifier bridge cannot reach a large capacity due to the limitation of the withstand voltage value of the power switch tube and its switching frequency, and does not meet the high voltage range and space of the power system. Due to the problems of large volume and weight and inconvenient use, a cascaded H-bridge PWM rectification system and its control method are proposed

Method used

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  • Cascaded h-bridge pwm rectification system and its control method
  • Cascaded h-bridge pwm rectification system and its control method
  • Cascaded h-bridge pwm rectification system and its control method

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specific Embodiment approach 1

[0060] Specific implementation mode one: combine Figure 1-3 Describe this embodiment, the cascaded H-bridge PWM rectification system of this embodiment is as follows figure 1 As shown, including: three-phase AC power supply, signal detection unit, control unit, isolated drive unit and rectifier circuit unit;

[0061] The output end of the three-phase AC power supply is connected to the input end of the signal detection unit, the output end of the signal detection unit is connected to the input end of the control unit, the output end of the signal control unit is connected to the input end of the drive unit, and the drive unit The output end of the unit is connected to the input end of the rectification circuit unit; the output end of the rectification circuit unit is connected to the signal detection unit;

[0062] The signal detection unit adopts the current Hall module CHB-25NP to realize three-phase current detection, and the secondary side current of the Hall sensor is d...

specific Embodiment approach 2

[0066] Specific implementation mode two: as Figure 4 As shown, this embodiment is further limited on the basis of specific embodiment 1. The optocoupler TLP250 chip is used in the circuit of the isolated drive unit. The use of optocoupler can reduce signal delay and realize the isolation of strong current and weak current. Improved reliability.

specific Embodiment approach 3

[0067] Specific implementation mode three: this implementation mode is further limited on the basis of specific implementation mode one, such as Figure 5 As shown, the signal detection unit uses the voltage Hall module CHV-50P to reduce the three-phase voltage to a sinusoidal signal with the same frequency and phase as the power grid with an amplitude of 5±0.5V. The square wave signal of V meets the requirements of DSP2812 on the input voltage, and the zero-crossing point of the grid voltage can be obtained by capturing the falling edge of the square wave signal through the DSP capture unit CAP3.

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Abstract

The invention relates to a high-voltage rectification device and a control method thereof, in particular to a cascaded H-bridge PWM rectification system and a control method thereof, and belongs to the field of high-voltage high-power power electronics. The present invention aims to solve the problem that the existing rectifying device composed of a three-phase rectifying bridge cannot reach a large capacity due to the limitation of the withstand voltage value of the power switch tube and its switching frequency, and does not meet the high voltage range of the power system. The cascaded H-bridge PWM rectification system of the present invention includes: a three-phase AC power supply, a signal detection unit, a control unit, an isolated drive unit, and a rectifier circuit unit; the control method of the cascaded H-bridge PWM rectification system of the present invention adopts The carrier phase shift sine wave pulse width modulation strategy suitable for cascaded H-bridge multilevel converters adopts a three-level control method, first controlling the overall DC side voltage, then controlling the voltage balance between phases, and finally controlling the voltage balance within the phase, which can Better balance the capacitor voltages of each phase and the DC side of each unit.

Description

technical field [0001] The invention relates to a high-voltage rectification device and a control method thereof, in particular to a cascaded H-bridge PWM rectification system and a control method thereof, and belongs to the field of high-voltage high-power power electronics. Background technique [0002] As an energy necessary for people's life, electric energy represents the comprehensive national strength of our country in terms of coverage and application. With the development of economy and technology, especially the rapid development of power electronics technology, it has been widely used in the field of electric power. Since the traditional rectification system is not limited by the withstand voltage and switching frequency of the power tube, or is limited by the volume and weight of the application space, the research on new multilevel converters in the future must develop in the direction of high efficiency, compactness, and more flexible control. . [0003] In th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219H02M7/217
CPCH02M7/2173H02M7/219H02M1/007
Inventor 孟大伟汤昊岳
Owner HARBIN UNIV OF SCI & TECH
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