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Control method of three-phase voltage type PWM rectifier under unbalance voltage of power grid

A three-phase voltage, grid voltage technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output and other directions, can solve the problems of inconvenient practical application, complicated system structure, etc. Effect

Inactive Publication Date: 2009-12-30
北京英特利科技有限公司 +1
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Problems solved by technology

However, because the control scheme uses two sets of rotating coordinate systems, four coordinate transformations and four current PI inner loops are required, which makes the system structure complicated and not convenient for practical application.

Method used

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  • Control method of three-phase voltage type PWM rectifier under unbalance voltage of power grid
  • Control method of three-phase voltage type PWM rectifier under unbalance voltage of power grid
  • Control method of three-phase voltage type PWM rectifier under unbalance voltage of power grid

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] Such as figure 1 As shown, the hardware circuit of the present invention includes a current sensor 1, a voltage sensor 2, a signal conditioning unit 3, an A / D converter 4, a DSP processing unit 5, a drive protection circuit 6, and a three-phase filter inductor 7 (wherein R a , R b and R c are the equivalent series resistance of the three-phase filter inductor 7 ), the rectifier bridge circuit 8 and the DC support capacitor 9 .

[0038] Current sensor 1 measures the PWM rectifier AC current i a i b i c . Voltage sensor 2 measures three-phase unbalanced grid voltage e a 、e b 、e c and DC voltage V dc. The current and voltage measured by the current sensor 1 and the voltage sensor 2 are input to the signal conditioning unit 3, and then enter the A / D converter 4 for A / D conversion after signal conditioning to obtain the PWM rectifier AC current, three-phas...

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Abstract

The invention relates to a control method of three-phase voltage type PWM rectifier under unbalance voltage of a power grid, relates to the technical field of power electrons. The method comprises the following steps: detecting three-phase power grid voltage value, and transforming to be under a two-phase static coordinate system; carrying out digital filtering on an Alpha-axis voltage component and a Beta-axis voltage component under the two-phase static coordinate system by a positive-negative sequence filter, and obtaining the Alpha-axis positive-negative sequence component and Beta-axis positive-negative sequence component; calculating and obtaining the Alpha-axis and Beta-axis current instruction according to the Alpha-axis and Beta-axis positive-negative sequence voltage component under the given active and reactive power and two-phase static coordinate system; detecting three-phase alternating current, transforming to be under the two-phase static coordinate system, adopting a predicting current control method, calculating and obtaining Alpha-axis input voltage instruction and Beta-axis input voltage instruction of the alternating side under the two-phase static coordinate system. SVPWM modulation is adopted to obtain driving pulse. The control method eliminates direct current voltage harmonic component of three-phase PWM rectifier under the unbalance voltage of the power grid and realizes the operation of controlled power coefficient.

Description

technical field [0001] The invention relates to a control method of a three-phase voltage type PWM rectifier, in particular to a method for suppressing DC voltage fluctuations under the condition of unbalanced grid voltage, and belongs to the technical field of power electronics. Background technique [0002] In the research process of the control strategy of the three-phase voltage-type PWM rectifier, it is generally assumed that the grid voltage is balanced. In fact, the grid voltage is often in an unbalanced state, that is, the amplitude or phase of the three-phase grid voltage is asymmetrical. When the grid voltage is unbalanced, the three-phase voltage-type PWM rectifier designed based on the three-phase grid voltage balance will appear in an abnormal operating state: a negative sequence component appears in the AC current of the PWM rectifier, making the AC current asymmetrical; DC voltage and AC current Non-characteristic harmonic components appear in the circuit, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/155
Inventor 林飞郑琼林黄泳均高吉磊游小杰杨中平郝瑞祥张立伟黄先进孙湖贺明智王琛琛李虹
Owner 北京英特利科技有限公司
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