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Three-level midpoint potential balance control method based on zero sequence voltage injection

A technology of zero-sequence voltage and potential balance, applied in electrical components, output power conversion devices, AC power input conversion to AC power output, etc., can solve problems such as complex calculations and high-precision acquisition circuits

Inactive Publication Date: 2010-06-23
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] The technology of the present invention solves the problem: it overcomes the complexity of the existing SVPWM midpoint potential balance control method, and the existing point potential balance control method based on zero-sequence voltage injection requires complex calculations and high-precision acquisition circuits. In the modulation mode, a novel and simple neutral point potential balance control method based on zero-sequence voltage injection is proposed

Method used

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  • Three-level midpoint potential balance control method based on zero sequence voltage injection
  • Three-level midpoint potential balance control method based on zero sequence voltage injection
  • Three-level midpoint potential balance control method based on zero sequence voltage injection

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Embodiment Construction

[0117] figure 1 It is a three-level inverter control system structure diagram, which mainly includes two main loops 80 and a control loop 85. The main circuit 80 is composed of a transformer 77, a rectifier bridge 78, a three-level inverter 79, and a motor load 86; the control circuit 85 includes a DSP control board 3, 12 PWM optical fiber sending and receiving circuits 83, and 12 fault signal optical fiber sending and receiving circuits. Receiving circuit 81, power supply module 82. In the main circuit 80, the transformer 77 is connected to the rectifier bridge 78. The rectifier bridge 78 converts the three-phase AC power provided by the transformer 77 into DC power for the three-level inverter 79. The rectifier bridge 78 is connected to the three-level inverter 79 , The inverter 79 is connected to the motor 86, the three-level inverter 79 converts the DC power output from the rectifier bridge 78 into a three-phase AC of the desired frequency f, and supplies it to the motor l...

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Abstract

The invention provides a three-level midpoint potential balance control method based on zero sequence voltage injection, which is a control method capable of effectively controlling the balance of the midpoint potential in a high-power diode clamped three-level inverter. The control method comprises: collecting to obtain voltage values and three-phase output current values of two capacitors on the two sides of a direct current bus through voltage and current sampling circuits, calculating the voltage difference of two capacitors, judging whether the midpoint level is balanced and judging the relation of the three-phase output current and midpoint current during vector output under multi-carrier wave PWM modulation policy, calculating to generate a three-phase modulation voltage by using a zero sequence voltage injection method according to a zero sequence voltage selection principle, comparing with carrier waves to generate a needed switching sequence so as to achieve the purpose of controlling the midpoint level balance in the three-level inverter. The invention not only controls the midpoint level effectively, but also has the advantages of simple control method and strong robustness, and can ensure the inverter to work stably in a total range.

Description

Technical field [0001] The invention relates to a three-level mid-point potential balance control method based on zero sequence voltage injection, which is used for the balance control of the mid-point potential of a high-power diode clamped three-level inverter, and is particularly suitable for low switching frequency and calculation For simple high-voltage and high-power applications, this control method is also suitable for the midpoint potential balance control of PWM rectifiers and active power filters with the same main circuit structure. Background technique [0002] Three-level inverters have been widely used in high-voltage and high-power applications due to their mature topology and low output voltage harmonic content. Compared with the two-level inverter, the three-level inverter has: under the condition of a certain DC bus voltage, the withstand voltage level of the switching device is reduced by half; under the same switching frequency, the three-level inverter The ...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M7/537
Inventor 周京华章小卫刘辉臣
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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