Optimizing control of single-phase PWM (Pulse-Width Modulation) rectifiers based on d-q coordinates

A Technology of Optimizing Control and Rectifier

Inactive Publication Date: 2015-07-15
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

Where L is the reactance connected to the AC side of the converter, R is the inductance resistance, and ω is the angular frequency of the grid side voltage. This control method is relatively complicated, and the calculation process includes differential operators, which affects the stable range of the system, and the controller implementation is also relatively complicated.

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  • Optimizing control of single-phase PWM (Pulse-Width Modulation) rectifiers based on d-q coordinates
  • Optimizing control of single-phase PWM (Pulse-Width Modulation) rectifiers based on d-q coordinates
  • Optimizing control of single-phase PWM (Pulse-Width Modulation) rectifiers based on d-q coordinates

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[0023] image 3 It is the optimal control of the single-phase PWM rectifier based on the d-q coordinate proposed by the present invention. Specifically, it is divided into two parts: the mathematical model of optimized d-q control, the detection of active current and reactive current. 1. Mathematical model of optimized d-q decoupling control

[0024] right Figure 4 Using Kirchhoff's voltage law for the shown rectifier gives:

[0025] u ab (t)=u s (t)-Ri s (t)-Ldi s / dt (4)

[0026] Among them, u ab is the AC port voltage, u s is the single-phase power supply voltage, L is the inductance connected to the AC side, and R is the internal resistance of the inductance.

[0027] Putting formulas (1)-(3) into formula (4), the mathematical model of the rectifier in the d-q coordinate system can be obtained as:

[0028] u d =U s -ωLI q -(R-Lp)I d (5)

[0029] u q =ωLI d -(R-Lp)I q (6)

[0030] Among them, p is a differential operator.

[0031] Equations (5) a...

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Abstract

The invention discloses an optimizing control method of single-phase PWM (Pulse-Width Modulation) rectifiers based on d-q coordinates. The reactive components and the power factors of the current of a rectifier are controlled by adopting double closed loops of an outer voltage loop and an inner current loop; a mathematic model of the single-phase rectifier is optimized based on conventional single-phase d-q decoupling control, the components Ud and Uq of the port voltage of a converter on the d-q coordinate system respectively consist of one component and adopt the crossing control of active and reactive power. Compared with the conventional d-q decoupling control, the optimizing control method disclosed by the invention has the advantages that the control structure is simpler, the digitalization of a controller is easy to realize, the dynamic response speed of the system is higher, the settling time of the system is shorter, the reactive components of the electric current of the rectifier can be controlled, and random power factors are easy to control.

Description

technical field [0001] The invention relates to a control of a single-phase PWM rectifier, in particular to an optimal control based on d-q coordinates. Background technique [0002] The single-phase PWM rectifier mainly needs to accomplish the following two control objectives: first, the voltage on the DC side is kept within the allowable deviation range; second, the power factor on the AC side is close to 1 or -1, that is, unit power factor control. [0003] In order to achieve the above two control objectives, the control system of the PWM rectifier widely adopts the double-loop control with the voltage as the outer loop and the current as the inner loop. At present, the current control mainly used is the transient current control, and its essence is the feedforward of the disturbance quantity. Voltage and current double closed-loop control. according to u ab (t)=u s (t)-ωLIcosωt-P[Isinωt-i s (t)] get as figure 1 The block diagram of the control is shown. Among them...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02M7/12H02M1/42
CPCY02B70/10Y02P80/10
Inventor 舒泽亮宋莎莎林静英陈亚军何晓琼
Owner SOUTHWEST JIAOTONG UNIV
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