Three-phase Vienna rectifier-based dead-beat forecast direct power control method

A power control and rectifier technology, which is applied in the conversion of AC power input to DC power output, output power conversion devices, and AC networks to reduce harmonics/ripples, etc. waves etc.

Active Publication Date: 2017-11-03
河南纽瑞电气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this invention relates to improving efficiency by eliminating all power device's energy loss when they switch on or off.

Problems solved by technology

In this patented technical problem addressed in this patents relating to improving the power supply system's characteristics without causing any negative effects like increased electrical stresses caused by noise sources and reduced energy transfer capacity due to improved linearity and impedance properties. There were various ways to achieve these goals through different techniques including design principles, control strategies, and analysis tools.

Method used

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  • Three-phase Vienna rectifier-based dead-beat forecast direct power control method
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  • Three-phase Vienna rectifier-based dead-beat forecast direct power control method

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Embodiment Construction

[0137] The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0138] figure 1 It is a flow chart of the control strategy of the three-phase Vienna rectifier.

[0139] Step 1: Establish the mathematical model of the three-phase Vienna rectifier in the αβ coordinate system based on Kirchhoff's law and coordinate transformation technology.

[0140] Step 2: Measure the input current i on the AC side through the ammeter and voltmeter x(x＝a、b、c) , three-phase grid voltage e x(x＝a、b、c) and DC side upper and lower capacitor voltage V C1 , V C2 , load voltage V dc .

[0141] Step 3: Transform the AC side grid voltage and inductor current in the abc coordinate system measured in step 2 to obtain e in the αβ coordinate system α 、e β i α i β .

[0142] Step 4: On the basis of the principle of instantaneous active a...

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Abstract

A three-phase Vienna rectifier-based dead-beat forecast direct power control method comprises the steps of firstly, building a mathematical model under a two-phase static Alpha-Beta coordinate system according to a working principle of a Vienna rectifier and a coordinate conversion technology; secondly, deducting a dead-beat forecast direct power model in detail on the basis of an instantaneous active power and reactive power principle of a three-phase circuit, estimating an active power at a (k+2)th moment by combining a Lagrange linear interpolation method, and calculating a control voltage vector under the Alpha-Beta coordinate system; and finally, controlling a rectifier switch device by employing space vector width modulation (SVPWM) having an embedded medium point voltage balancing function. By the control method, an error brought by control delay is eliminated to a great extent, the influence of the control delay on power control is improved, the harmonic distortion of an input current is effectively reduced, and the current distortion is eliminated.

Description

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Claims

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Application Information

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Owner 河南纽瑞电气科技有限公司
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