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LC serial-type three-phase PWM rectifier current iterative learning control method

An iterative learning control and rectifier technology, which is applied in the direction of converting AC power input to DC power output, electrical components, and output power conversion devices, which can solve the problems of high cost, large size, and low reliability.

Active Publication Date: 2015-08-12
新源智储能源发展(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in medium and high voltage applications, APF generally adopts multiple technologies and needs to be connected to the power grid through a step-down transformer, which is large in size, high in cost and low in reliability.

Method used

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  • LC serial-type three-phase PWM rectifier current iterative learning control method

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Embodiment Construction

[0027] figure 1 It is an LC series three-level PWM rectifier. Each bridge arm of the PWM converter is composed of four switching tubes and two clamping diodes, and the DC side is composed of two capacitors connected in series. The midpoint of the switching tube of each bridge arm is connected to the power grid through the LC filter branch, and the midpoint of the clamping diode of each bridge arm is connected to the midpoint of the two DC capacitors. Each switching tube only bears half of the DC side voltage, so this topology can be applied to medium and high voltage applications to achieve high power output.

[0028] There are four common filtering branches, L filter, LC filter, LCL filter, and LC series filter. In the three-phase inverter, the research and application of the first three filtering branches are more, and the last one is less. A high-power PWM rectifier that can take both reactive power and harmonic compensation into consideration will be studied here, and t...

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Abstract

The invention discloses an LC serial-type three-phase PWM rectifier current iterative learning control method. The power converter not only can rectify output power to power a load, but also can compensate reactive and harmonic currents generated by an adjacent nonlinear load. For the compensation for the adjacent nonlinear load, effective integration of a PWM rectification function and a power compensation function is achieved by using an LC serial filter, and high-power reactive and harmonic compensation output is realized. Through adoption of an iterative learning algorithm, the response performance of the control system is improved, and the capacitive inertia damping effect of the LC serial filter is overcome.

Description

technical field [0001] The invention relates to the field of current control of three-phase PWM converters, in particular to an LC series-type three-phase PWM rectifier current iterative learning control method. Background technique [0002] In high-voltage and high-power applications, the traditional two-level converter topology is difficult to meet. In the absence of a fundamental breakthrough in the level of power devices, in order to achieve high-frequency and low-harmonic high-voltage high-power conversion, an effective means is to start with circuit topology and control methods to find solutions to problems. Compared with the two-level converter, the multi-level converter has the advantages of good harmonic characteristics and small switching voltage stress, and is a research hotspot in the field of high-power, medium-high voltage converters. Among them, the three-level PWM converter is a kind of multi-level converter that is widely used in industrial enterprises at p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
Inventor 马伏军毕然徐千鸣周奔
Owner 新源智储能源发展(北京)有限公司
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