A method for suppressing the starting current impact of a three-phase voltage type pwm rectifier

A technology of starting current and three-phase voltage, which is applied to electrical components, output power conversion devices, etc., can solve the problems of large starting current shock and starting current shock, and achieve the effect of suppressing current shock, improving reliability, and being easy to implement.

Inactive Publication Date: 2016-08-24
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a method for suppressing the starting current impact of a three-phase voltage type PWM rectifier that solves the problem of large starting current impact in the direct current control technology

Method used

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  • A method for suppressing the starting current impact of a three-phase voltage type pwm rectifier
  • A method for suppressing the starting current impact of a three-phase voltage type pwm rectifier
  • A method for suppressing the starting current impact of a three-phase voltage type pwm rectifier

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Embodiment

[0028] In the present invention, the steady-state output voltage value of the DC side is 300V, the rated load is 30Ω, the rated capacity is 3kW, the peak value of the AC side voltage is 100V, and the given value of the outer ring voltage is u dc * The change curve of y=kx 2 Take k=3500000, Δt 1 =6.5ms, take the DC side capacitor current i c Time Δt as a given value for the reactive current loop 2 =4.5ms, for simulation verification.

[0029] figure 2 , Figure 4 and Figure 6 It is the waveform diagram of the original voltage and current double closed-loop control. image 3 , Figure 5 and Figure 7 It is a waveform diagram after adopting the control method of the present invention. Depend on figure 2 and image 3 It can be seen from the comparison that after adopting the control method of the present invention, the no-load start-up impulse current of the rectifier is reduced from 3 times of the original steady state current to 1.3 times of the steady state curre...

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Abstract

The invention relates to the PWM rectification control field, in particular to a three-phase voltage type PWM rectifier starting current surge suppression method. The alternating current side network voltage, the input current and the direct current side bus voltage of a rectifier are detected, the detected network voltage and the detected input current are subjected to 3s / 2r conversion, components of the network voltage and the input current under a dq coordinate system are acquired, a given voltage value changes according to a first rule and then is output through a voltage adjuster to serve as a given active current component id, a given idle current value changes according to a second rule, voltage vector instruction values of the active current and the idle current under the dq coordinate system are output through a current adjuster, then the voltage vector instruction values are converted into instruction values under an alpha beta coordinate system through 2r / 2s conversion, and next, a switching signal for controlling a power device is generated through modulation of an SVPWM module. With the method, current surge of the rectifier under no-load or load starting conditions can be effectively suppressed, and the reliability of the system is improved.

Description

technical field [0001] The invention relates to the field of PWM rectification control, in particular to a method for suppressing the starting current impact of a three-phase voltage type PWM rectifier. Background technique [0002] The voltage-type PWM rectifier has the advantages of low harmonics of AC current on the AC side, unity power factor, bidirectional energy flow and constant DC voltage control, etc., and has attracted people's attention day by day. In the PWM rectifier control system, the control of the AC side current is an important performance index of the voltage-type PWM rectifier. [0003] The direct current control strategy of the three-phase voltage PWM rectifier is a control method that makes it follow the current given signal through direct control of the AC side current. The rectifier control system is composed of the AC current inner loop and the DC voltage outer loop. The direct current control method of coordinate transformation has high control pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M1/32
Inventor 姚绪梁王旭杨光仪冯丽媛从晓丹张文清汪光照孙亚王伟谢科星
Owner HARBIN ENG UNIV
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