GSC control method based on resonance second order sliding mode

A control method and second-order sliding mode technology, which is applied in the direction of converting irreversible AC power input to DC power output, and irreversible DC power input to AC power output, can solve the problem of reducing the system response speed, rapidity and Adverse effects on stability, unstable operation of the system, etc.

Active Publication Date: 2013-09-11
ZHEJIANG UNIV
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Problems solved by technology

The above-mentioned extraction of negative sequence and harmonic components introduces a large number of coordinate transformations and notch filters, resulting in a large control delay, easy to cause unstable operation of the system, and reduce the rapidity of system response

Method used

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  • GSC control method based on resonance second order sliding mode
  • GSC control method based on resonance second order sliding mode
  • GSC control method based on resonance second order sliding mode

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Embodiment Construction

[0045] In order to describe the present invention more specifically, the GSC control method of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0046] Such as figure 2 As shown, a GSC control method based on the resonant second-order sliding mode includes the following steps:

[0047] (1) Use the voltage Hall sensor 2 to collect the three-phase incoming line voltage U of the GSC a ~ U c and DC bus voltage U dc , using the current Hall sensor 3 to collect the three-phase incoming line current I of the GSC a ~ I c ;

[0048] Use the Clark transformation module 4 to pair the three-phase incoming line voltage U a ~ U c and three-phase incoming line current I a ~ I c Perform Clark transformation to obtain the α-axis component U of the three-phase incoming line voltage in the static α-β coordinate system α and the β-axis component U β And the α-axis component I of the three-phase ...

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Abstract

The invention discloses a GSC control method based on a resonance second order sliding mode. The control method is performed directly in a rest frame, power grid voltage phase estimation is omitted; complex negative sequence and harmonic component extraction is unnecessary, so that disintegration delay is avoided, and control speed is increased; adverse effect caused by power grid voltage imbalance and harmonic waves, so that stable output, low steady error state and good dynamic response features are achieved, and expected control effect is achieved; by the method, enhanced GSC control can be achieved under weak power grid voltage, and power output capacity of the converters during power grid faults is increased effectively.

Description

technical field [0001] The invention belongs to the technical field of converter control, and in particular relates to a GSC control method based on a resonant second-order sliding mode. Background technique [0002] GSC (grid-connected three-phase voltage source converter) has been widely used in power factor compensation, renewable energy, DC transmission, active filtering, etc. field. At present, in the research of GSC, it is generally assumed that the power grid is an ideal sinusoidal voltage, and the vector directional control method is used to control the stability of the DC bus voltage and maintain excellent output power quality. However, in practice, the power grid shows more non-ideal characteristics of imbalance and harmonic distortion. GSC operating in this case will show harsh power fluctuations and harmonic currents, which will further pollute the power grid and destroy the operation stability of the power grid. At the same time, it will also cause fluctuation...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02M7/48
Inventor 年珩全宇
Owner ZHEJIANG UNIV
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