CN202085077U

CN202085077U - High-voltage frequency converter

Info

Publication number: CN202085077U
Application number: CN 201120172490
Authority: CN
Inventors: 余维成; 李强; 栗晋杰
Original assignee: Jiangsu Lipu Electronics Science & Technology Co Ltd
Current assignee: Jiangsu Lipu Electronics Science & Technology Co Ltd
Priority date: 2011-05-26
Filing date: 2011-05-26
Publication date: 2011-12-21
Anticipated expiration: 2021-05-26

Abstract

The utility model discloses a high-voltage frequency converter, which comprises a bypass cabinet, a transformer cabinet, a power cabinet, a control cabinet and an electric motor, wherein a phase shifting transformer is arranged in the transformer cabinet, a secondary side of the phase shifting transformer comprises twenty seven secondary side windings, twenty seven power units are arranged in the power cabinet, every nine power units form one phase, and the total number of the phases is three, and the twenty seven power units are respectively connected with the twenty seven sub side windings one by one and are also connected with the control cabinet. The high-voltage frequency converter has the advantages that all power modules are made into a unified unit, the interchangeability is greatly improved, the maintenance is convenient, and in addition, a main body structure is formed by connecting a plurality of groups of power units in series, so the required high-voltage output is generated through overlying each group of low voltage, the pollution on electric network harmonics is little, the input current harmonic aberration rate is lower than 3 percent, the input voltage harmonic aberration rate of an electric network is lower than 1.5 percent, and IEEE518-1882 harmonic suppression standards are directly met.

Description

A kind of high voltage converter

Technical field

The utility model relates to a kind of frequency converter, specifically high voltage converter.

Background technology

Frequency converter VFD (Variable-frequency Drive) uses converter technique and microelectric technique, and the frequency by changing the machine operation power supply and the mode of amplitude are controlled the Electric Drive element of alternating current motor.Frequency converter is integrated high-voltage high-power transistor technology and electron controls technology are used widely.The effect of frequency converter is frequency and the amplitude that changes the alternating current machine power supply, thereby changes the cycle of its moving magnetic field, reaches the purpose of level and smooth control motor speed.The appearance of frequency converter, make complicated speed regulating control oversimplify, with frequency converter+mouse cage AC formula induction motor combination replacement the most of work that originally can only finish with direct current machine, dwindled volume, reduced maintenance rate, made drive technology develop into the new stage.Present frequency converter interchangeability is relatively poor, maintenance is difficult for, the noise height, and harmonic content is bigger, causes the torque pulsation of motor easily.

The utility model content

For overcoming the deficiencies in the prior art, the utility model provides that a kind of interchangeability is good, easy to maintenance, noise is low, harmonic content is little, can not cause the high voltage converter of motor torque ripple.

For achieving the above object, technical solution adopted in the utility model is a kind of high voltage converter, comprises bypass cabinet, transformer case, power cabinet, control cubicle and motor; Be provided with phase shifting transformer in the described transformer case, the secondary of phase shifting transformer comprises that 27 are paid the limit winding, be provided with 27 power cells in the described power cabinet, per nine power cells are formed a phase, be total to three-phase, 27 power cells and 27 pairs of limit windings join one by one, and 27 power cells also join with control cubicle.

For guaranteeing the safety of circuit, be provided with manual bypass and auto by pass in the described bypass cabinet, manual bypass and auto by pass all join with the three-phase that phase shifting transformer and power cell are formed.

Beneficial effect: the utility model is made into unified unit with all power models, improved interchangeability greatly, easy to maintenance, and agent structure is formed by many groups power unit cascade, thereby produce the high pressure output that needs by each group low pressure stack, it is little to harmonic pollution in electric power net, the Harmonics of Input distortion is less than 3%, the harmonic distortion of electrical network input voltage is less than 1.5%, the harmonic wave that directly satisfies IEEE518-1882 suppresses standard, the input power factor height needn't adopt input harmonics filter and power factor compensation device; The output waveform quality is good, and output current harmonics distorts less than 2%, and problems such as additional heating of the motor that does not exist harmonic wave to cause and torque pulsation, noise, output dv/dt, common-mode voltage needn't add output filter, just can use common asynchronous machine.

Description of drawings

Fig. 1 is the utility model structured flowchart;

Fig. 2 is the circuit connecting of a kind of embodiment of the present utility model, is manual bypass in the bypass cabinet wherein, and 10 is voltage transformer among the figure, and 11 is motor.

Embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, present embodiment is being to implement under the prerequisite with technical solutions of the utility model, should understand these embodiment only be used to the utility model is described and be not used in the restriction scope of the present utility model.

As shown in Figure 1, a kind of high voltage converter comprises bypass cabinet 1, transformer case 2, power cabinet 3, control cubicle 4 and motor 5; In bypass cabinet 1, be provided with manual bypass 8 and auto by pass 9, in transformer case 2, be provided with phase shifting transformer 5, the secondary of phase shifting transformer 5 comprises that 27 are paid limit winding 6, in power cabinet 3, be provided with 27 power cells 7, per nine power cells 7 are formed a phase, be total to three-phase, manual bypass 8 and auto by pass 9 all join with the three-phase that phase shifting transformer 5 and power cell 7 are formed, and 27 power cells 7 and 27 pairs of limit windings 6 join one by one, and 27 power cells 7 also join with control cubicle 4.

Fig. 2 is a kind of circuit connecting of the present utility model, wherein each power cell and each pair limit winding join one by one, voltage transformer joins with manual bypass and control cubicle respectively, motor and manual bypass are joined, when breaking down, frequency converter can make high-voltage motor go to power frequency operation, circuit is running as usual, does not influence production work.

What the utility model governing system adopted is the Gao-high scheme of power unit cascade, has adopted many windings high pressure phase shifting transformer, and the electric current that flows through in the secondary side winding when the transformer primary side superposes, forms and approaches very much sinusoidal wave current waveform.Through actual test, during the 50Hz operation, current on line side harmonic wave＜2%, motor side harmonic wave of output voltage＜1.5% (even when 40Hz, still＜2%), the efficient of the complete sets of equipment＞86%, power factor＞85%.Satisfied the requirement of IEEE 518-1882 fully to voltage, current harmonic content.

The utility model is provided with the power frequency bypass and switches cabinet, when breaking down, frequency converter can make high-voltage motor go to power frequency operation, bypass is switched has manual bypass and auto by pass to switch two kinds of patterns, manual bypass needs manual operation, time is longer, be adapted to not have reserve arrangement or unessential operating condition, auto by pass can directly be converted to power frequency operation automatically after frequency converter breaks down.

The utility model adopts the units in series multiple inverter configuration, the every unit 8 series connection of 9KV series, the unit is more, to bear voltage lower for IGBT like this, can have broad overvoltage region (〉=1.15Ue), equipment dependability is higher.

Claims

1. a high voltage converter is characterized in that: comprise bypass cabinet (1), transformer case (2), power cabinet (3) and control cubicle (4); Be provided with phase shifting transformer (5) in the described transformer case (2), the secondary of phase shifting transformer (5) comprises that 27 are paid limit winding (6), be provided with 27 power cells (7) in the described power cabinet (3), per nine power cells (7) are formed a phase, be total to three-phase, 27 power cells (7) join one by one with 27 pairs of limit windings (6), and 27 power cells (7) also join with control cubicle (4).

2. according to the described a kind of high voltage converter of claim 1, it is characterized in that: be provided with manual bypass (8) and auto by pass (9) in the described bypass cabinet (1), manual bypass (8) and auto by pass (9) all join with the three-phase that phase shifting transformer (5) and power cell (7) are formed.