CN202221959U - Three-phase PWM rectifier soft start device - Google Patents
Three-phase PWM rectifier soft start device Download PDFInfo
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- CN202221959U CN202221959U CN2011202263874U CN201120226387U CN202221959U CN 202221959 U CN202221959 U CN 202221959U CN 2011202263874 U CN2011202263874 U CN 2011202263874U CN 201120226387 U CN201120226387 U CN 201120226387U CN 202221959 U CN202221959 U CN 202221959U
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- pwm rectifier
- phase pwm
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- soft start
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Abstract
The utility model relates to a three-phase PWM rectifier soft start device, belonging to the technical field of the power electronic current converting. The three-phase PWM rectifier soft start device comprises three input bidirectional thyristors and a controller, wherein the bidirectional thyristors are accessed to the space between a three-phase electric network and a rectifier. At the starting moment, the conduction angle of the bidirectional thyristor is greatly increased by the control of the controller until the bidirectional thyristor is at the full conducting state. Before the PWM rectifier works at the normal state, a bus voltage rises to a certain value and then the rectifier is started, thus the direct current bus voltage slowly rises without relatively large impact and a power device is effectively protected. The three-phase PWM rectifier soft start device is widely used in the products such as three-phase PWM rectifiers, active electric power filters, reactive compensators and four-quadrant operation frequency converters.
Description
Technical field
The utility model relates to the soft starting device of a kind of three-phase PWM (pulse width modulation) rectifier, belongs to power electronics, Semiconductor Converting Technology field.
Background technology
Rectifier is as the part that all is absolutely necessary in the application of supply unit in all trades and professions that electric energy is become direct current by interchange.Traditional rectifier is the uncontrollable rectification circuit that is constituted by a diode or constitutes the phase control rectifier circuit of being made up of thyristor, because its control is simple, reliable operation has obtained using widely in the transformation of electrical energy field of power electronic equipment.Yet this type rectifier exists the current on line side harmonic content higher, and from the electrical network absorbing reactive power, power factor of electric network is more on the low side, energy can only unidirectional delivery etc. shortcoming, make it use the more and more requirement of incompatibility modern power electronic development.
In nineteen seventies, the someone begins the PWM technology is introduced the rectification field and obtained good effect.Adopt the PWM rectification can obtain unity power factor and sineization input current.Compare with phase control rectifier, the PWM rectifier reduces the demand of electric capacity, this type of reactor passive filtering element or energy-storage travelling wave tube greatly, and dynamic property also improves a lot.The hf rectifier long period does not afterwards but obtain promoting, and a reason is the restriction that has received full control device development level, and Another reason is that harmonic problem is very not outstanding, lacks demand motive force.The PWM rectifier application that develops into of big capacity self-turn-off device provides hardware foundation.Along with seriousization of harmonic problem, the harmonic standard that various countries formulate is that the development of PWM rectifier provides power.
The high-power PWM rectifier of three-phase soft Starting Technology is one of key that has PWM rectifier practicability.Because the AC side inductance of PWM rectifier is very little, DC side only has electric capacity, if directly control without soft start-up process, with producing very big impulse current, causes the dc voltage fluctuation bigger, and the safety of power device is threatened.The soft start main purpose is the unfavorable factors such as rush of current and dc voltage overshoot that suppress in the start-up course, guarantees that the PWM rectifier can also devote oneself to work smoothly in the startup of safety and steady ground.
Summary of the invention
Defective in view of the prior art existence; When the purpose of the utility model provides the high-power PWM rectifier of a kind of solution three-phase and starts; Owing to the too fast rising of DC bus-bar voltage electrical network is produced impact, and the Three-Phase PWM Rectifier soft starting device of possible wasted power device.
For realizing above-mentioned purpose; The technical scheme that the utility model adopted is: a kind of Three-Phase PWM Rectifier soft starting device, form by 3 input bidirectional triode thyristors and controller, and wherein bidirectional triode thyristor inserts between three phase network and the rectifier; Starting moment; Through the control of controller, make the angle of flow of bidirectional triode thyristor in official hour, increase gradually, until fully conducting state.
Described bidirectional triode thyristor is selected two-way inverse parallel controllable silicon for use; Can select specification according to input voltage and electric current, because after the three-phase PWM rectification entering normal operating conditions, silicon-controlled device will be operated in fully conducting state always; Therefore, device chooses surplus and should suitably increase.
Use this device can make the PWM rectifier before operate as normal, busbar voltage rises to certain value, starts rectifier on this basis, and DC bus-bar voltage is risen gently, greater impact can not occur, has effectively protected power device.This device can be widely used in the product in fields such as Three-Phase PWM Rectifier, Active Power Filter-APF, reactive-load compensator, four quadrant running frequency converter.
Description of drawings
Fig. 1 is the Three-Phase PWM Rectifier system block diagram.
Among the figure: 1, three phase network, 2, bidirectional triode thyristor, 3, controller, 4, rectifier.
Embodiment
A kind of Three-Phase PWM Rectifier soft starting device as shown in Figure 1 mainly is made up of 3 input bidirectional triode thyristors 2 and controller 3.Wherein bidirectional triode thyristor 2 inserts between three phase network 1 and the rectifier 4, starting moment, through the control of controller 3, makes the angle of flow of bidirectional triode thyristor 2 in official hour, increase gradually, until fully conducting state.In this process, IGBT (insulated gate bipolar transistor) is in off state, because the existence of fly-wheel diode, so rectifier is in the diode rectification state of deploying to ensure effective monitoring and control of illegal activities, and DC bus-bar voltage steadily rises.After DC bus-bar voltage is stable, start PWM control, Three-Phase PWM Rectifier will get into normal operating conditions stably.
Said bidirectional triode thyristor 2 is selected two-way inverse parallel controllable silicon for use; Can select specification according to input voltage and electric current, because after the three-phase PWM rectification entering normal operating conditions, silicon-controlled device will be operated in fully conducting state always; Therefore, device chooses surplus and should suitably increase.
This device can make the PWM rectifier before operate as normal, and busbar voltage rises to certain value, starts rectifier on this basis, and DC bus-bar voltage is risen gently, greater impact can not occur, has effectively protected power device.
Claims (2)
1. a Three-Phase PWM Rectifier soft starting device is characterized in that being made up of 3 bidirectional triode thyristors (2) and controller (3), and bidirectional triode thyristor (2) device adds between three phase network (1) and the PWM rectifier (4).
2. according to requiring 1 described a kind of Three-Phase PWM Rectifier soft starting device in the circle, it is characterized in that bidirectional triode thyristor (2) selects two-way inverse parallel controllable silicon for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202263874U CN202221959U (en) | 2011-06-30 | 2011-06-30 | Three-phase PWM rectifier soft start device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202263874U CN202221959U (en) | 2011-06-30 | 2011-06-30 | Three-phase PWM rectifier soft start device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202221959U true CN202221959U (en) | 2012-05-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202263874U Expired - Fee Related CN202221959U (en) | 2011-06-30 | 2011-06-30 | Three-phase PWM rectifier soft start device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202221959U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753332A (en) * | 2015-04-22 | 2015-07-01 | 浙江乔兴建设集团湖州智能科技有限公司 | Single-phase UPS (uninterrupted power supply) busbar voltage soft start method utilizing bidirectional SCR (silicon-controlled rectifier) input switch |
-
2011
- 2011-06-30 CN CN2011202263874U patent/CN202221959U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753332A (en) * | 2015-04-22 | 2015-07-01 | 浙江乔兴建设集团湖州智能科技有限公司 | Single-phase UPS (uninterrupted power supply) busbar voltage soft start method utilizing bidirectional SCR (silicon-controlled rectifier) input switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120516 Termination date: 20140630 |
|
| EXPY | Termination of patent right or utility model |