PWM (pulse width modulation) rectifier input and output power compensation control method in voltage asymmetry
A voltage asymmetry, input and output technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problems of increasing the amount of calculation of the control scheme and failing to realize the unit power factor operation of the system, etc. , to achieve the effect of guaranteed input and output quality, simple algorithm, and easy implementation
Inactive Publication Date: 2015-05-06
HENAN NORMAL UNIV
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Problems solved by technology
Although this method avoids the calculation of positive and negative sequences in the current inner loop, in order to calculate the given value of positive and negative sequence currents, it is necessary to decompose the positive and negative sequences of each component in the system, which increases the calculation amount of the control scheme
In addition, this method cannot achieve unity power factor operation of the system
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[0012] The present invention will be further described below in conjunction with the accompanying drawings. The main circuit structure of the three-phase voltage-type PWM converter is as follows: figure 1 as shown, figure 1 middle, P i , Q i with P o , Q o are grid input power and rectifier output power, respectively, u a , u b , u c is a three-phase voltage source on the AC side, i a , i b , i c is the input current of the three-phase AC side, v a , v b , v c is the three-phase voltage at the input side of the power bridge, u dc is the DC side voltage, O is the grid midpoint, L with R are the incoming inductance and its equivalent resistance, respectively, C is the DC bus capacitor. In an ideal situation, it can be considered that the input power of the grid is equal to the sum of the output power of the rectifier and the power consumed by the incoming inductance and equivalent resistance, and the output power of the rectifier is equal to the ...
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The invention discloses a PWM (pulse width modulation) rectifier input and output power compensation control method in voltage asymmetry. The technical scheme mainly includes that the PWM rectifier input and output power compensation control method in voltage asymmetry includes: negating an output active power actual value and an input reactive power actual value of a system prior to respectively enabling the negated values to pass through band-pass filters and PI (proportional integral) controllers, performing second harmonic compensation voltage computation to obtain an output active power second harmonic compensation item and an input reactive power second harmonic compensation item respectively, adding voltage reference values obtained by vector control with the second harmonic compensation items respectively, and performing reverse Park transformation by using a network voltage position angle as a transformation angle, so that reference voltages in a two-phase static coordinate system are obtained, and switching signals of a power device are generated after voltage signals are subjected to space vector pulse width modulation. By the PWM rectifier input and output power compensation control method in voltage asymmetry, input reactive power pulses and output active power pulses of a PWM rectifier can be compensated directly, and stable control of unity power factor running and direct-current bus voltage of the system is realized.
Description
technical field [0001] The invention relates to a compensation control method for input and output power of a PWM rectifier when the voltage is asymmetrical, belonging to the control field of power electronic power conversion devices, in particular to a compensation control method for the input and output power of a PWM rectifier when the voltage is asymmetrical. Background technique [0002] When the three-phase voltage of the power grid is unbalanced due to the unbalanced fault of the grid voltage, the input reactive power of the PWM rectifier designed based on the voltage three-phase balance condition will have double frequency harmonics, which cannot achieve unit power factor operation; the output active power will appear double Double frequency harmonics, resulting in double frequency fluctuations in the DC bus voltage. [0003] Aiming at the control of three-phase PWM rectifier under grid voltage asymmetry fault, some scholars propose to establish two current controlle...
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IPC IPC(8): H02M7/219H02M1/12
Inventor 王萌施艳艳
Owner HENAN NORMAL UNIV
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