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Controlling method for predicting direct power of three-phase voltage source type PWM converter

A three-phase voltage and power control technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve rapid reduction, switching frequency is not fixed, difficult output filter design, etc. problem, to achieve the effect of responding to power changes and rapid power changes

Active Publication Date: 2013-09-25
湖南中聚福能源科技有限公司
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AI Technical Summary

Problems solved by technology

Direct power also has a direct power control strategy based on power hysteresis control, but the switching frequency of this control method is not fixed, and it is difficult to design the output filter
The fixed-frequency virtual flux linkage directional direct power control method based on PI adjustment can realize fixed-frequency direct power control, but the rapidity is reduced

Method used

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  • Controlling method for predicting direct power of three-phase voltage source type PWM converter

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Embodiment Construction

[0028] Further illustrate the present invention below in conjunction with accompanying drawing.

[0029] Such as figure 1 As shown, the main circuit topology of the three-phase voltage source type PWM converter used in the present invention includes six IGBT switching devices, connecting reactance L, DC side capacitor C and so on. e a 、e b and e c is the phase voltage of the three-phase grid; i a i b and i c is the three-phase grid current; v a , v b and v c is the AC side voltage output value of the three-phase voltage source PWM converter; v dc is the DC side voltage; L and R are the AC side inductance and resistance values ​​respectively. Three-phase voltage source PWM converter according to the DC side current i dc Different directions can work in the rectification and inverter states respectively. The predicted direct power control steps of the present invention are as follows:

[0030] According to the theoretical knowledge of the circuit, we can get the ci...

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Abstract

The invention discloses a controlling method for predicting direct power of a three-phase voltage source type PWM converter. The dead-beat controlling concept in predictive control is introduced into the direct power controlling strategy of the three-phase voltage source type PWM converter, two controllers, namely a voltage controlling ring and a dead-beat power controlling ring, finish power decoupling control and direct current voltage stabilizing control together, and a phase-locked loop is not needed. In addition, the space vector modulation manner is used so as to achieve switching frequency constancy controlled by direct power, and therefore an output filter is easy to design and engineering is easy to achieve. The controller is simple in design and good in performance of controlling and has the advantages of being fast in response speed, high in controlling precision and good in robustness.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a direct power control method for a three-phase voltage source type PWM converter, in particular to a direct power control method based on power prediction deadbeat regulation. Background technique [0002] With the continuous development of power electronics technology and the continuous improvement of the performance of power semiconductor switching devices, the three-phase voltage source PWM converter has already realized the sinusoidal grid-side current, and operates at unity power factor, and even bidirectional energy transmission. Due to its controlled current source characteristics, the three-phase voltage source PWM converter has been widely used, such as static var generator (SVG), active power filter (APF), light high voltage direct current transmission (HVDC ), grid-connected power generation of renewable energy such as wind energy, etc. [0003] Grid-connected contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02J3/38
Inventor 黄守道叶虹志高剑罗德荣张文娟
Owner 湖南中聚福能源科技有限公司
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