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Cooperative control system and method of voltage-type PWM rectifier based on LCL filtering

A technology of collaborative control and control method, applied in electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the problem that active damping control strategies rarely occur, and achieve good convergence speed and control accuracy, THD The effect of reduction enhancement, higher harmonic filtering effect enhancement

Inactive Publication Date: 2020-04-28
HUBEI UNIV OF ARTS & SCI
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Problems solved by technology

As an excellent control strategy, the cooperative control strategy has received extensive attention, but it rarely appears as an active damping control strategy in LCL-VSR

Method used

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  • Cooperative control system and method of voltage-type PWM rectifier based on LCL filtering
  • Cooperative control system and method of voltage-type PWM rectifier based on LCL filtering
  • Cooperative control system and method of voltage-type PWM rectifier based on LCL filtering

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Embodiment Construction

[0063] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0064] The voltage-type PWM rectifier cooperative control system based on LCL filtering in this embodiment includes an AC power supply module, a voltage signal acquisition sensor, a phase-locked loop, a current signal acquisition sensor, a controller module, a rectifier bridge power switch tube, and a DC power supply. The AC power module is respectively connected with the rectifier bridge power switch tube, the voltage signal acquisition sensor, and the current signal acquisition sensor through wires. The rectifier bridge power switch tube is respectively connected with the DC power supply and the controller module through wires; the voltage signal acquisition sensor is respectively connected with the phase-locked loop and the controller module through wires; the current signal acquisition sensor is connected with the controller module through wires. T...

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Abstract

The invention relates to a power electronic nonlinear control technology, and particularly relates to a cooperative control system and method of a voltage-type PWM rectifier based on LCL filtering. The method comprises the steps of obtaining an LCL-VSR mathematical model under a three-phase abc coordinate system according to KVL and KCL, obtaining a mathematical model under a dq coordinate systemby adopting equivalent coordinate transformation, and further obtaining a switching function model of the LCL-VSR; searching for an appropriate manifold, and constructing the manifold in a proportion-integration form; and conducting comprehensive control, solving a system control rule, and designing a cooperative controller. A controller module obtains a voltage control signal through conversion according to a d-axis switching function and a q-axis switching function, controls a rectifier bridge power switching tube according to a space vector pulse width modulation algorithm, and rectifies alternating current output by an alternating current power supply module into direct current. The method is good in anti-interference performance, the high-order harmonic filtering effect and THD reduction are significantly improved, and the resonance is effectively removed. The LCL-VSR controller based on a cooperative control strategy is good in convergence rate and control precision, and the stability of the system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of power electronic nonlinear control, in particular to a cooperative control system and method of a voltage-type PWM rectifier based on LCL filtering. Background technique [0002] With the development of electronic control technology, LCL filter PWM voltage source rectifier (VSR) has better high-order harmonic filtering effect than traditional L filter PWM rectifier, so it has been widely researched and promoted. However, the introduction of the filter capacitor increases the resonance phenomenon. If it cannot be effectively removed, it will cause the increase of the total harmonic distortion (THD) and damage the system stability. In order to avoid the resonance problem, many control theories are applied to the VSR of LCL filter (LCL-VSR), such as sliding mode control theory, direct power control strategy, virtual resistance method, undamped control strategy, etc. These methods are designed in different wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/12H02M1/42
CPCH02M7/219H02M1/12H02M1/4233Y02B70/10
Inventor 王晓东高维士马强汪云
Owner HUBEI UNIV OF ARTS & SCI
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