CN202026265U - High-voltage variable-frequency soft start system - Google Patents

High-voltage variable-frequency soft start system Download PDF

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Publication number
CN202026265U
CN202026265U CN201120065149XU CN201120065149U CN202026265U CN 202026265 U CN202026265 U CN 202026265U CN 201120065149X U CN201120065149X U CN 201120065149XU CN 201120065149 U CN201120065149 U CN 201120065149U CN 202026265 U CN202026265 U CN 202026265U
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CN
China
Prior art keywords
frequency
variable
switch
voltage
conversion
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Application number
CN201120065149XU
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Chinese (zh)
Inventor
杨培新
韩伟
赵珊
董睿
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襄樊大力电工有限公司
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Priority to CN201120065149XU priority Critical patent/CN202026265U/en
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Publication of CN202026265U publication Critical patent/CN202026265U/en

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Abstract

A high-voltage variable-frequency soft start system comprises a high-voltage frequency conversion device and an electric motor, wherein a variable-frequency soft starter is arranged in the high-voltage frequency conversion device; the input terminal of the variable-frequency soft starter is connected with a variable-frequency input switch; the other end of the variable-frequency input switch is connected with a high-voltage input switch; the other end of the high-voltage input switch is connected with a power frequency grid; the output terminal of the variable-frequency soft starter is connected with a variable-frequency output switch; the other end of the variable-frequency output switch is connected with the electric motor; and a power frequency switch is arranged between the variable-frequency input switch and the variable-frequency output switch. The high-voltage variable-frequency soft start system avoids secondary current impact and circumferential flow, and has a better phase-locked control effect and lower control demand.

Description

A kind of high-pressure frequency-conversion Soft Starting System
Technical field
The utility model relates to a kind of Soft Starting System, relates in particular to a kind of high-pressure frequency-conversion Soft Starting System, specifically is applicable to when reducing high-tension motor starts the rush of current to common frequency power network.
Background technology
At present; high-tension motor can cause very big rush of current to electrical network when starting; usually need to adopt the soft device that opens of high-pressure frequency-conversion that motor start-up is switched to power frequency operation again after rated speed for this reason; thereby when effectively reducing motor start-up to the rush of current of electrical network; and motor and electrical network played a protective role; but when it switches to power frequency from frequency conversion, can cause that secondary current impacts because exist inconsistent between frequency conversion frequency and the mains frequency.
Existing high-pressure frequency-conversion soft initiator switching is adopted asynchronous switching often and is switched this dual mode synchronously:
Asynchronous switching: be exactly that actuating motor is after rated frequency, earlier frequency conversion output is disconnected from motor machine end, Deng the motor set end voltage is common frequency power network to be switched on the motor after zero again, because reducing to zero, the motor set end voltage needs the long period, so switching time usually with second level be unit, not only switching time is longer, and motor also can to cause rotating speed to descend because of the state that the long period is in the free reduction of speed of no power supply a lot, thereby cause when common frequency power network switches, causing bigger secondary current impact;
Switch synchronously: be exactly that actuating motor is after rated frequency, earlier common frequency power network is switched on the motor, this moment, variable frequency soft starter and common frequency power network were powered to motor simultaneously, and then frequency conversion output disconnected from motor machine end, because the motor power supply exists all the time, so the secondary current that does not exist rotating speed decline to cause impacts, but to when exporting, frequency conversion can realize common frequency power network is switched on the motor, just must guarantee the frequency of the voltage of frequency conversion output voltage and common frequency power network, phase place, the amplitude strict conformance, otherwise can produce bigger circulation because of the difference of voltage waveform, cause handoff failure, its control requires high, and reliability is lower.
Summary of the invention
The purpose of this utility model is to overcome the secondary current that easily causes that exists in the prior art to impact, can produce the defective and the problem of having relatively high expectations than big circulation, control, provides a kind of secondary current that can not cause to impact, can not produce circulation, the lower high-pressure frequency-conversion Soft Starting System of control requirement.
For realizing above purpose, technical solution of the present utility model is: a kind of high-pressure frequency-conversion Soft Starting System, comprise high voltage frequency converter and motor, one end of described high voltage frequency converter is connected with common frequency power network, the other end is connected with motor, and is provided with variable frequency soft starter in the inside of high voltage frequency converter; The input of described variable frequency soft starter is connected with the frequency conversion input switch, the other end of frequency conversion input switch is connected with common frequency power network, the output of variable frequency soft starter is connected with frequency conversion output switch, the other end of frequency conversion output switch is connected with motor, and is provided with the power frequency switch between frequency conversion input switch, frequency conversion output switch.
The other end of described frequency conversion input switch is connected with common frequency power network by motor operation cabinet.
The inside of described motor operation cabinet is provided with the high pressure input switch, and an end of high pressure input switch is connected with common frequency power network, and the other end is connected with the other end of frequency conversion input switch.
The voltage range of described common frequency power network is 6 – 10KV.
Compared with prior art, the beneficial effects of the utility model are:
1, owing to be provided with variable frequency soft starter in the inside of high voltage frequency converter in a kind of high-pressure frequency-conversion Soft Starting System of the utility model, the two ends of this variable frequency soft starter respectively with the frequency conversion input switch, frequency conversion output switch is connected, the other end of frequency conversion input switch is connected with common frequency power network, the other end of frequency conversion output switch is connected with motor, and at the frequency conversion input switch, be provided with the power frequency switch between the frequency conversion output switch, during use, earlier finish phase-locked control with the common frequency power network frequency by variable frequency soft starter, finish soft handover with common frequency power network voltage by variable frequency soft starter again, thereby realize that finally high-tension motor switches to the soft start of power frequency from frequency conversion; Wherein, the process of phase-locked control is: variable frequency soft starter rises to the setpoint frequency value with output voltage frequency earlier, the phase angle of detection of grid voltage again, when the phase angle of line voltage is in phase-locked calculated value, variable frequency soft starter begins frequency conversion, when output voltage frequency is consistent with the line voltage frequency, finish phase-locked control, this moment output frequency and common frequency power network frequency, phase place, it is consistent that amplitude reaches, whole process only needs variable frequency soft starter, the frequency conversion input switch, cooperate and to realize between the frequency conversion output switch, do not need special phase-locked frequency locking circuit, can be because of again frequency being caused phase-locked failure to phase again yet, its control method realizes easily, and to after finishing mutually, the frequency between frequency conversion output voltage and the common frequency power network voltage, the error of phase place is also minimum.Therefore not only the effect of phase-locked control is better for the utility model, and control requires lower.
2, because the variable frequency soft starter in a kind of high-pressure frequency-conversion Soft Starting System of the utility model can be after the phase-locked control of finishing with the common frequency power network frequency, continue to finish soft handover with common frequency power network voltage, its soft switching process is: control power frequency switch adhesive earlier, frequency conversion output pulse is blocked in time-delay before the adhesive of power frequency switch main contacts, and control of conversion output switch disconnects, forward power frequency operation until motor to from frequency conversion, motor dead electricity handoff procedure is controlled at Millisecond and finishes; At first and since in the handoff procedure motor dead electricity time be controlled at Millisecond and finish, the motor set end voltage changes very little, is consistent with common frequency power network voltage basically, common frequency power network voltage can not cause when switching to the motor operation that secondary current impacts; Secondly, because motor is when common frequency power network is powered to motor in the handoff procedure, frequency conversion output pulse is blocked, and therefore will not have the problem of output voltage waveforms difference between variable frequency soft starter and common frequency power network, thereby the circulation phenomenon can not occur, just can not produce circulation yet.Therefore the utility model can not cause that not only secondary current impacts, and can not produce circulation.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Among the figure: high voltage frequency converter 1, motor 2, common frequency power network 3, variable frequency soft starter 4, motor operation cabinet 5, frequency conversion input switch KM1, frequency conversion output K switch M2, power frequency K switch M3, high pressure input switch QF.
Embodiment
Below in conjunction with description of drawings and embodiment the utility model is described in further detail
Referring to Fig. 1, a kind of high-pressure frequency-conversion Soft Starting System comprises high voltage frequency converter 1 and motor 2, and an end of described high voltage frequency converter 1 is connected with common frequency power network 3, the other end is connected with motor 2, and is provided with variable frequency soft starter 4 in the inside of high voltage frequency converter 1; The input of described variable frequency soft starter 4 is connected with frequency conversion input switch KM1, the other end of frequency conversion input switch KM1 is connected with common frequency power network 3, the output of variable frequency soft starter 4 is connected with frequency conversion output K switch M2, the other end of frequency conversion output K switch M2 is connected with motor 2, and is provided with power frequency K switch M3 between frequency conversion input switch KM1, frequency conversion output K switch M2.
The other end of described frequency conversion input switch KM1 is connected with common frequency power network 3 by motor operation cabinet 5.
The inside of described motor operation cabinet 5 is provided with high pressure input switch QF, and the end of high pressure input switch QF is connected with common frequency power network 3, and the other end is connected with the other end of frequency conversion input switch KM1.
The voltage range of described common frequency power network 3 is 6 – 10KV.
During use, earlier with variable frequency soft starter 4 and frequency conversion input switch KM1, frequency conversion output K switch M2 connects, and disconnection power frequency output K switch M3, then variable frequency soft starter 4 is begun to start from initial frequency, stable operation when output voltage frequency reaches phase-locked setpoint frequency, detect the phase angle of common frequency power network 3 voltages simultaneously, when the phase angle equals phase-locked calculated value, variable frequency soft starter 4 beginning frequency conversions, when its output voltage frequency and common frequency power network 3 electric voltage frequencies are approaching, the phase place of the phase place of its output voltage and common frequency power network 3 voltages is also approaching, thereby when output voltage frequency is consistent with common frequency power network 3 electric voltage frequencies, its output voltage phase place is also just in time consistent with common frequency power network 3 voltage-phases, promptly finish the phase-locked control of frequency conversion, at this moment the output frequency of variable frequency soft starter 4 and the frequency of common frequency power network 3 frequencies, phase place, amplitude is identical.
After variable frequency soft starter 4 is finished the phase-locked control of above-mentioned frequency conversion, elder generation's stable operation a period of time, when the output frequency of determining variable frequency soft starter 4 and the frequency of common frequency power network 3 frequencies, phase place, after amplitude is identical, control power frequency K switch M3 adhesive again, frequency conversion output pulse is blocked in time-delay before the adhesive of KM3 main contacts, the dead electricity handoff procedure of motor 2 just can be controlled at Millisecond and finishes like this, when common frequency power network 3 voltages turn on the motor 2, the set end voltage of motor 2 voltage with common frequency power network 3 basically is identical, thereby there is not secondary current to impact, control of conversion output K switch M2 disconnects in the handoff procedure, at this moment motor 2 has forwarded power frequency operation to from frequency conversion, has realized docking of motor 2 and common frequency power network 3.
Therefore the utility model can not cause that not only secondary current impacts, can not produce circulation, and the effect of phase-locked control is better, control requires lower.

Claims (4)

1. high-pressure frequency-conversion Soft Starting System, comprise high voltage frequency converter (1) and motor (2), one end of described high voltage frequency converter (1) is connected with common frequency power network (3), the other end is connected with motor (2), and be provided with variable frequency soft starter (4) in the inside of high voltage frequency converter (1), it is characterized in that: the input of described variable frequency soft starter (4) is connected with frequency conversion input switch (KM1), the other end of frequency conversion input switch (KM1) is connected with common frequency power network (3), the output of variable frequency soft starter (4) is connected with frequency conversion output switch (KM2), the other end of frequency conversion output switch (KM2) is connected with motor (2), and at frequency conversion input switch (KM1), be provided with power frequency switch (KM3) between the frequency conversion output switch (KM2).
2. a kind of high-pressure frequency-conversion Soft Starting System according to claim 1 is characterized in that: the other end of described frequency conversion input switch (KM1) moves cabinet (5) by motor and is connected with common frequency power network (3).
3. a kind of high-pressure frequency-conversion Soft Starting System according to claim 2, it is characterized in that: the inside of described motor operation cabinet (5) is provided with high pressure input switch (QF), one end of high pressure input switch (QF) is connected with common frequency power network (3), and the other end is connected with the other end of frequency conversion input switch (KM1).
4. according to claim 1,2 or 3 described a kind of high-pressure frequency-conversion Soft Starting System, it is characterized in that: the voltage range of described common frequency power network (3) is 6 – 10KV.
CN201120065149XU 2011-03-14 2011-03-14 High-voltage variable-frequency soft start system CN202026265U (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102946136A (en) * 2012-10-24 2013-02-27 国电南京自动化股份有限公司 Circuit and method for switching from power frequency of high-voltage inverter to variable frequency without disturbance
CN105281609A (en) * 2015-10-23 2016-01-27 首钢京唐钢铁联合有限责任公司 Control system and control method for external bypass running of soft starter
CN105391348A (en) * 2015-12-18 2016-03-09 成都成发科能动力工程有限公司 Variable-frequency soft starting system for axial flow compressor and method thereof
CN105676742A (en) * 2016-03-14 2016-06-15 广东明阳龙源电力电子有限公司 Control method for non-disturbance switching between power frequency and variable frequency of high-voltage inverter
CN105871291A (en) * 2016-04-11 2016-08-17 西南交通大学 Bumpless transfer method used for frequency converter and common frequency power network
CN106026787A (en) * 2016-07-11 2016-10-12 太原理工大学 Five-stage discrete frequency-conversion soft-start device based on power factor angle closed-loop control
CN107959442A (en) * 2017-11-29 2018-04-24 武汉纺织大学 A kind of human action data management system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102946136A (en) * 2012-10-24 2013-02-27 国电南京自动化股份有限公司 Circuit and method for switching from power frequency of high-voltage inverter to variable frequency without disturbance
CN102946136B (en) * 2012-10-24 2015-05-13 国电南京自动化股份有限公司 Circuit and method for switching from power frequency of high-voltage inverter to variable frequency without disturbance
CN105281609A (en) * 2015-10-23 2016-01-27 首钢京唐钢铁联合有限责任公司 Control system and control method for external bypass running of soft starter
CN105391348A (en) * 2015-12-18 2016-03-09 成都成发科能动力工程有限公司 Variable-frequency soft starting system for axial flow compressor and method thereof
CN105391348B (en) * 2015-12-18 2018-03-27 成都成发科能动力工程有限公司 A kind of variable frequency soft start system and method for axial flow compressor
CN105676742A (en) * 2016-03-14 2016-06-15 广东明阳龙源电力电子有限公司 Control method for non-disturbance switching between power frequency and variable frequency of high-voltage inverter
CN105676742B (en) * 2016-03-14 2018-07-03 广东明阳龙源电力电子有限公司 The control method of switching undisturbed between a kind of high-voltage frequency converter power frequency and frequency conversion
CN105871291A (en) * 2016-04-11 2016-08-17 西南交通大学 Bumpless transfer method used for frequency converter and common frequency power network
CN105871291B (en) * 2016-04-11 2018-03-20 西南交通大学 One kind is used for frequency converter with common frequency power network without impact switching method
CN106026787A (en) * 2016-07-11 2016-10-12 太原理工大学 Five-stage discrete frequency-conversion soft-start device based on power factor angle closed-loop control
CN107959442A (en) * 2017-11-29 2018-04-24 武汉纺织大学 A kind of human action data management system

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Effective date of registration: 20111128

Address after: 441000 Hubei high tech Zone in Xiangyang City, HangYu Road No. 5

Patentee after: Big Pawer Electrical Technology Xiangyang Co., Ltd.

Address before: 441003 Hubei high tech Zone in Xiangfan City, HangYu Road No. 5

Patentee before: Xiangfan Big Pawer Electrical Engineering Co., Ltd.

Effective date of registration: 20111128

Address after: 441000 Hubei high tech Zone in Xiangyang City, HangYu Road No. 5

Patentee after: Big Pawer Electrical Technology Xiangyang Co., Ltd.

Address before: 441003 Hubei high tech Zone in Xiangfan City, HangYu Road No. 5

Patentee before: Xiangfan Big Pawer Electrical Engineering Co., Ltd.

C41 Transfer of patent application or patent right or utility model
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Owner name: BIG PAWER ELECTRICAL TECHNOLOGY XIANGYANG CO., LTD

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