Neutral-point-potential balance control device and method for direct current side of VIENNA rectifier

A potential balance and control method technology, applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc.

Active Publication Date: 2015-08-12
SOUTHEAST UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a VIENNA rectifier DC side mid

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  • Neutral-point-potential balance control device and method for direct current side of VIENNA rectifier

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] figure 1 It is the main circuit topology diagram of the three-phase three-level (VIENNA) rectifier, in the figure L a , L b , L c is the AC side inductance, i a i b i c Enter the current for the AC side. S a , S b , Sc It is a two-way switch. V dc is the DC side output voltage, C 1 、C 2 are the DC support capacitors, V c1 , V c2 is the capacitance C 1 、C 2 voltage across. V MID is the midpoint voltage, under normal circumstances, the midpoint voltage does not shift, V MID =V dc / 2. However, due to the inconsistency of the supporting capacitor parameters, unbalanced load, and different modulation strategies, the charging and discharging of the capacitor will be unbalanced, resulting in fluctuations in the midpoint voltage, and the midpoint voltage fluctuation value ΔV dc defined as ΔV dc =V c1 -V c2 .

[0036] figure 2 It is a functiona...

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Abstract

The invention discloses a neutral-point-potential control method for a direct current side of a three-phase three-level rectifier and a neutral-point-potential control system for direct current side of the three-phase three-level rectifier, which are applied to digital one-cycle control. The principle of the control method is as follows: firstly collecting a current value of an input side of the rectifier and voltage values of an upper capacitor and a lower capacitor at the direct current side, then calculating an integral initial value of each period in the one-cycle control so as to control the duty ratio of a three-phase switch tube, thereby balancing the neutral-point-potential of the direct current side. A core control system is composed of a DSP and an FPGA. The DSP is mainly used for calculating a zero sequence duty ratio, carrying out PI control over the voltage differences of the upper capacitor and the lower capacitor at the direct current side, calculating the integral initial value of a single cycle, communicating with an upper computer, etc. The FPGA is mainly used for collecting data, judging failures, protecting, realizing the one-cycle control method and the like. The method has the characteristics that the algorithm is simple and easy to realize, the hardware cost is low and the control effect is excellent.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a DC side midpoint potential balance control method and system for a VIENNA rectifier applied to digital single-cycle control. Background technique [0002] With the rapid development of power electronics technology, the use of nonlinear components injects a large number of harmonics into the power grid. In order to solve this problem, power factor correction circuits are more and more applied to power electronic equipment. VIENNA rectifier is an excellent three-phase three-level power factor correction rectifier, which has the advantages of simple structure and easy maintenance, less number of switches, less stress on power devices, and no danger of output voltage through-through. [0003] One Cycle Control (OCC for short) is a new type of PWM control technology proposed by Professor Keyue M.Smedley of the University of California in the early 1990s. The basic idea is...

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Application Information

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IPC IPC(8): H02M7/217
Inventor 赵剑锋高铁峰张松波
Owner SOUTHEAST UNIV
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