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Double closed loop control method of Vienna rectifier

A double-closed-loop control and rectifier technology, applied in the direction of irreversible AC power input conversion to DC power output, high-efficiency power electronic conversion, output power conversion device, etc., can solve the problem of large harmonic content of grid-side current and slow dynamic response speed , poor anti-interference performance and other problems, to achieve the effect of stable output DC voltage, small amount of calculation, and improved response speed

Inactive Publication Date: 2017-06-20
李福来
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of slow dynamic response speed, poor anti-interference performance, and large content of grid-side current harmonics (THD) in Vienna rectifiers, the present invention proposes a double closed-loop control method for Vienna rectifiers

Method used

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Embodiment Construction

[0013] figure 1 In, each bidirectional switch consists of a switching power device and four diodes, the structure is as follows figure 1 Shown in the right half; there are two fast recovery diodes (phase a) on each bridge arm. The active power flows from the AC side to the DC side in one direction, while the reactive power only flows on the AC side. The coupling relationship between the two is reflected by the AC inductance; the DC capacitor does not consume power in one switching cycle, but only provides a stable DC voltage. ;Active power is represented by the square of the value of the DC voltage, the output of the voltage outer loop is used as the active given value of the power inner loop, and the reactive given value is set to zero.

[0014] The sliding mode controller adopts the exponential reaching rate to design the sliding mode controller, which is used to reduce the chattering of the sliding mode variable structure control. By selecting parameters reasonably, the d...

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Abstract

A double closed loop control method of a Vienna rectifier comprises a three-phase Vienna main circuit, a voltage outer-loop sliding-mode control part and a power inner-loop sliding-mode control part. An algorithm is simple in control structure and low in computational burden. The introduction of a voltage square feedback system makes the system have a good dynamic voltage tracking effect. When the system is started and subjected to a load sudden change, the double closed loop sliding-mode control improves the system response speed and improves the anti-interference performance of the system. Further, the double closed loop sliding-mode control algorithm can meet the control performance requirement of the system: the grid side is a unit power factor, the input current is high in sinusoidal degree and low in harmonic content, the output DC voltage is stable and small in ripple.

Description

technical field [0001] The invention relates to a control method of a Vienna rectifier, in particular to a double closed-loop control method of a Vienna rectifier. Background technique [0002] Sliding Mode Control (Sliding Mode Control, SMC) is a discontinuous nonlinear control that quickly switches the control state of the system on a pre-designed sliding mode surface. It has high-frequency switching characteristics and is especially suitable for switching power electronic devices. control. Moreover, SMC does not require high precision of the system model, is insensitive to parameter changes and external disturbances, and has the advantages of fast dynamic response, strong anti-interference ability, simple control law and easy implementation. Three-phase Vienna rectifier, because of its few switches, simple circuit structure, no output voltage bridge arm pass-through, no need to set switch dead zone, low input current harmonic content, and can realize input unit power fac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/06H02M1/12H02M1/14H02M1/42
CPCH02M1/12H02M1/14H02M1/4208H02M7/06H02M1/0006Y02B70/10
Inventor 李福来
Owner 李福来
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