Control method of high-voltage cascade energy feedback converter power module

An energy feedback, power module technology, applied in the field of power electronics, can solve problems such as damage to frequency conversion equipment, grid-side current imbalance, harmonic amplitude increase, etc., to achieve the effect of enhanced stability and fast dynamic response

Inactive Publication Date: 2013-05-22
SOUTHEAST UNIV +1
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Problems solved by technology

However, the general-purpose inverters currently used have problems such as large grid-side current harmonic pollution, irreversible energy, and large DC-side capacitors, which are easily damaged.
[0003] However, most of the frequency converters targeted at the research on PWM rectifier control strategy in unbalanced state of the powe

Method used

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  • Control method of high-voltage cascade energy feedback converter power module
  • Control method of high-voltage cascade energy feedback converter power module
  • Control method of high-voltage cascade energy feedback converter power module

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0032] The main circuit of the control device is composed of five parts, which are: the three-phase grid-connected filter inductor connected to the grid side; the fuse is connected in series with the incoming line of the power module to protect the module in case of overcurrent; the power circuit on the grid-connected side is Three-phase rectifier bridge, the rectifier bridge is composed of IGBTs; the DC filter voltage equalization link is connected in parallel through resistors and capacitors; the inverter side is composed of H bridges.

[0033] The system adopts modular programming, separates the functions of DSP and CPLD, and clearly defines the division of labor between DSP and CPLD. DSP is responsible for the calculation of the grid side, which includes the calculation of the software phase...

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Abstract

The invention discloses a control method of a high-voltage cascade energy feedback converter power module. Network-side voltage is oriented by a software phase-locked ring. The network-side voltage is subjected to positive and negative sequence component separation before calculation of the software phase-locked ring so that positive sequence component in the network-side voltage is extracted. The positive sequence component is used as an input single of the software phase-locked ring to allow for phase tracking for the network-side voltage positive sequence component. A three-phase inverter mathematical model with positive and negative sequence independent control in a rotating coordinate system is used on the grid-connection side, so that normal operation of the system is guaranteed in case of grid distortion. A double closed-loop vector control system with a voltage outer loop and a current inner loop is used, the voltage outer loop is used for controlling DC-side voltage of the power module and provides current command signals to the current ring loop, and fast response of the system can be achieved.

Description

technical field [0001] The invention belongs to the field of energy-saving and environment-friendly power electronics, and in particular relates to a control method for a high-voltage cascaded energy feedback frequency converter with energy bidirectional flow. Background technique [0002] With the development of power electronic devices, modern control theory, and computer technology, the control performance of AC motor frequency conversion speed regulation technology has been greatly improved. Frequency conversion speed regulation has become the trend of contemporary AC motor speed regulation, and has been widely used in various fields of industrial control. Wide range of applications. However, the general-purpose inverters currently used have problems such as large grid-side current harmonic pollution, irreversible energy, and large DC-side capacitors that are easily damaged. [0003] However, most of the frequency converters targeted at the research on PWM rectifier con...

Claims

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Application Information

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IPC IPC(8): H02J3/40
Inventor 张俊成刘春松胡炫杨奇穆天柱李冰钱诗宝郑亚孙晓洁叶桦
Owner SOUTHEAST UNIV
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