CN208461470U - A kind of anti-low voltage ride through device of frequency converter - Google Patents
A kind of anti-low voltage ride through device of frequency converter Download PDFInfo
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- CN208461470U CN208461470U CN201821207142.5U CN201821207142U CN208461470U CN 208461470 U CN208461470 U CN 208461470U CN 201821207142 U CN201821207142 U CN 201821207142U CN 208461470 U CN208461470 U CN 208461470U
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Abstract
The utility model relates to power equipment safeguards technique fields, and in particular to a kind of anti-low voltage ride through device of frequency converter, including battery cupboard, main control module cabinet and feed out cabinet；The battery cupboard is internally provided with battery and battery protecting circuit；The main control module cabinet is internally provided with charger module UR, voltage dip protective device VSP, power conversion module BHQ, display module HMI, main monitoring module GC-MASTER and signal acquisition module；AC power source is connect by charger module UR with battery, and battery is that voltage dip protective device VSP and power conversion module BHQ powers by battery protecting circuit；The main monitoring module GC-MASTER is connect with display module HMI and signal acquisition module respectively；Circuit is protected in the execution that is internally provided with for feeding out cabinet, and the execution protection circuit is connect with the output end of voltage dip protective device VSP.The utility model improves the ability of the anti-low voltage crossing of frequency converter.
Description
Technical field
The utility model relates to power equipment safeguards technique fields, and in particular to a kind of anti-low voltage crossing dress of frequency converter
It sets.
Background technique
With being growing for power grid, the probability that electric system is broken down is consequently increased, due to supplying in practical application
The a variety of causes such as electric user increases, complex circuit, the case where causing electric system instantaneous low-voltage generation.And frequency converter is producing
It is got more and more applications in system, but the anti-low voltage ride-through capability of frequency converter is poor, therefore the low-voltage of power grid can be to change
Frequency device generates large effect, easily causes frequency converter stoppage in transit, causes process units to stop transport, while also occurring because of process
Biggish secondary accident of safety and environmental protection etc. caused by not in time.It is as far as possible enterprise to guarantee the continuous production of process units
Industry reduces loss and reduces accident rate, and the safety and stability long-term operation of crucial Frequency Converter Control equipment, which seems, especially to close
Key and important.
Summary of the invention
Shutdown caused by order to solve frequency converter when low-voltage occurs for power grid, it is anti-that the utility model provides a kind of frequency converter
Low voltage ride through device improves the ability of the anti-low voltage crossing of frequency converter.
In order to achieve the above object, the technical solution adopted in the utility model is:
The anti-low voltage ride through device of a kind of frequency converter provided by the utility model, including battery cupboard, main control module cabinet and feedback
It offers for sale；
The battery cupboard is internally provided with battery and battery protecting circuit；
The main control module cabinet is internally provided with charger module UR, voltage dip protective device VSP, power supply modulus of conversion
Block BHQ, display module HMI, main monitoring module GC-MASTER and signal acquisition module；AC power source passes through charger module UR
It is connect with battery, battery is that voltage dip protective device VSP and power conversion module BHQ is supplied by battery protecting circuit
Electricity, the out-put supply of the power conversion module BHQ is as control power supply, the voltage dip protective device VSP in frequency conversion tank
Output voltage be inverter supply；The main monitoring module GC-MASTER respectively with display module HMI and signal acquisition module
Connection；
Circuit, the execution protection circuit and voltage dip protective device are protected in the execution that is internally provided with for feeding out cabinet
The output end of VSP connects.
Further, the battery cupboard is internally provided with battery data logging device, the input terminal and storage of the battery data logging device
Battery connection, the output end of battery data logging device are connect with main monitoring module GC-MASTER.
Further, the battery protecting circuit includes first fuse FU1 and the first circuit breaker Q F1, the battery
Output end successively pass through first fuse FU1, the first circuit breaker Q F1 be voltage dip protective device VSP and power supply modulus of conversion
Block BHQ.
Further, the main control module cabinet is internally provided with power quality analyzer PQR, the power quality analysis
Instrument PQR is connect with ac bus.
Further, the signal acquisition module is for detecting AC-input voltage and average anode current, and will test
Signal real-time Transmission give main monitoring module GC-MASTER, the signal acquisition module use voltage sensor and current sense
Device.
Further, the display module HMI uses touch screen.
Further, the voltage dip protective device VSP includes boost chopper and isolation circuit.
Further, the boost chopper includes preliminary filling electrical circuit, the first inductance L1, the second inductance L2, bridge-type
IGBT module, the first DC capacitor C1 and the second DC capacitor C2, the preliminary filling electrical circuit include the normally opened touching of the first relay
Point KM1, the normally opened contact KM2 of the second relay and resistance R1, the normally opened contact KM1 and the second relay of first relay
Normally opened contact KM2 it is in parallel, the resistance R1 connects with the normally opened contact KM1 of the first relay；The direct current of battery output
The the first inductance L1 and the second inductance L2, bridge-type IGBT module and series connection that source is successively passed through preliminary filling electrical circuit, is connected in parallel
The first DC capacitor C1 and the second DC capacitor C2 connection；The isolation circuit is anti-including the first counnter attack diode D1 and second
The output end of anti-diode D2, the boost chopper connect change by the first counnter attack diode D1 and the second counnter attack diode D2
The DC bus of frequency device.
Further, the execution protection circuit includes isolating diode D0, the second circuit breaker Q F2 and second fuse
FU2, it is molten that the output end of the voltage dip protective device VSP successively passes through isolating diode D0, the second circuit breaker Q F2 and second
Disconnected device FU2 is inverter supply.
Further, the execution protection circuit includes discharge examination unit, and the discharge examination unit is using Hall electricity
Press element HOE.
Compared with prior art, the positive beneficial effect of the utility model is:
1, when low-voltage occurs for power grid, voltage dip protective device VSP comes into operation, voltage dip protective device VSP
The frequency converter continuous working period can be maintained not less than 40S, when network voltage restores, voltage dip protective device VSP is automatic
Working condition is exited, stand-by heat is switched to, shutdown caused by effectively preventing frequency converter when low-voltage occurs for power grid.
2, voltage dip, voltage interruption and voltage are occurred for detecting in record power grid using power quality analyzer PQR
The power quality problems such as harmonic wave analyze power failure point convenient for user query.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of the anti-low voltage ride through device of frequency converter of the utility model；
Fig. 2 is a kind of connection schematic diagram of the cabinet body of the anti-low voltage ride through device of frequency converter of the utility model；
Fig. 3 is a kind of work flow diagram of the anti-low voltage ride through device of frequency converter of the utility model；
Fig. 4 is the connection schematic diagram of voltage dip protective device VSP and frequency converter；
Fig. 5 is the circuit diagram that protective device VSP temporarily drops in pressure.
Meaning representated by serial number in figure are as follows: 1. battery cupboards, 2. main control module cabinets, 3. feed out cabinet, 4. batteries, and 5. first
Fuse, 6. first breakers, 7. charger modules, 8. voltage dip protective devices, 9. power conversion modules, 10. isolation two
Pole pipe, 11. second breakers, 12. second fuses, 13. display modules, 14. main monitoring modules, 15. signal acquisition modules,
16. battery data logging device, 17. power quality analyzers, 18. first inductance, 19. second inductance, 20. bridge-type IGBT modules, 21.
One DC capacitor, 22. second DC capacitors, the normally opened contact of 23. first relays, the normally opened contact of 24. second relays,
25. resistance, 26. first counnter attack diodes, 27. second counnter attack diodes, 28. execute protection circuit.
Specific embodiment
Embodiment one, as shown in Fig. 2, a kind of anti-low voltage ride through device of frequency converter, including battery cupboard 1, main control module cabinet 2
With feed out cabinet 3.
As shown in Figure 1, the battery cupboard 1 is internally provided with battery 4, battery data logging device 16 and battery protecting circuit.
Each battery 4 is connected comprising 32 section single batteries, and single battery voltage class is 12V, rated capacity 75AH, according to load
Size, which determines, configures several group storage batteries 4；The input terminal of the battery data logging device 16 is connect with battery 4, battery data logging device 16
Output end is connect with main monitoring module (GC-MASTER) 14, and battery data logging device 16 is used to monitor the operating condition of battery pack, and will
Battery voltage condition sends main monitoring module (GC-MASTER) 14 to.The battery protecting circuit includes first fuse (FU1)
5 and first breaker (QF1) 6.
The main control module cabinet is internally provided with charger module (UR) 7, power quality analyzer (PQR) 17, voltage
Temporarily drop protective device (VSP) 8, power conversion module (BHQ) 9, display module (HMI) 13, main monitoring module (GC-MASTER) 14
With signal acquisition module 15.AC power source is connect by charger module (UR) 7 with battery 4, and battery 4 is by the first fusing
The 5, first breaker of device (FU1) (QF1) 6 is voltage dip protective device (VSP) 8 and power conversion module (BHQ) 9 is powered, institute
The out-put supply of power conversion module (BHQ) 9 is stated as control power supply, the voltage dip protective device (VSP) 8 in frequency conversion tank
Output voltage by feed out cabinet 3 be inverter supply.The main monitoring module (GC-MASTER) 14 respectively with display module
(HMI) 13 and signal acquisition module 15 connect.
Further, the charger module (UR) 7 is used to alternating voltage being converted to DC voltage；Power conversion module
(BHQ) 9 for being converted to 220V DC voltage for the DC voltage that battery 4 exports；The display module (HMI) 13 is mainly used
In display AC-input voltage, DC output voltage, operation instruction, indicating fault, shake electricity SOE record, charging voltage, single only electricity
Cell voltage etc., uses touch screen；The main monitoring module (GC-MASTER) 14 is for monitoring that the anti-low-voltage of entire frequency converter is worn
More device, monitoring AC-input voltage, DC output voltage, battery voltage condition, charger module UR operation conditions etc.；It is described
The signal real-time Transmission that signal acquisition module 15 is used to detect AC-input voltage and average anode current, and will test is to main prison
Module (GC-MASTER) 14 is controlled, the signal acquisition module 15 includes voltage sensor, current sensor and battery data logging device
16。
As shown in Figure 4 and Figure 5, the voltage dip protective device (VSP) 8 includes boost chopper and isolation circuit.
The boost chopper include preliminary filling electrical circuit, the 18, second inductance of the first inductance (L1) (L2) 19, bridge-type IGBT module 20,
First DC capacitor (C1) 21 and the second DC capacitor (C2) 22, the preliminary filling electrical circuit include the normally opened contact of the first relay
(KM1) normally opened contact (KM2) 24 and resistance (R1) 25 of the 23, second relay, the normally opened contact (KM1) of first relay
23 is in parallel with normally opened contact (KM2) 24 of the second relay, the normally opened contact (KM1) of the resistance (R1) 25 and the first relay
23 series connection；The first inductance (L1) 18 and second that the DC power supply that battery 4 exports successively passes through preliminary filling electrical circuit, is connected in parallel
Inductance (L2) 19, bridge-type IGBT module 20 and the first DC capacitor (C1) 21 being connected in series and the second DC capacitor (C2) 22 connect
It connects；The isolation circuit includes the first counnter attack diode (D1) 26 and the second counnter attack diode (D2) 27, the boost chopper electricity
The output end on road connects the DC bus of frequency converter by the first counnter attack diode (D1) 26 and the second counnter attack diode (D2) 27.It is logical
DC input voitage, can be upgraded to the higher DC voltage of grade, and be stored in by the conducting dutycycle for crossing adjustment lower bridge arm IGBT
On first DC capacitor (C1) 21 and the second DC capacitor (C2) 22, preliminary filling electrical circuit realizes the first direct current in initial power-on
Hold the steady charging of (C1) 21 and the second DC capacitor (C2) 22,4 DC power supply of battery is as voltage dip protective device
(VSP) 8 input, it is straight that output end through internal first counnter attack diode (D1) 26 and the second counnter attack diode (D2) 27 connects frequency converter
Flow bus.The advanced technology of the use of voltage dip protective device (VSP) 8, economical rationality, safe and applicable, maintenance is few, Ke Yiyou
The reduction operating cost of effect.When low-voltage occurs for power grid, voltage dip protective device (VSP) 8 can maintain frequency converter to continue
Runing time is not less than 40S, and when network voltage restores, voltage dip protective device (VSP) 8 automatically exits from working condition, turns
For stand-by heat.
The power quality analyzer (PQR) 17 connect with ac bus, and voltage dip, electricity occur in power grid for detecting
Pressure is interrupted and the power quality problems such as voltage harmonic, and user can be helped to search and position power failure point, and prediction prevents three-phase
The problem of with single phase distribution system, using the tendency chart shown on screen and can be caught with on-line real time monitoring power quality situation
The event obtained, and in the data of backstage record, can quickly diagnose fault.
Circuit 28 is protected in the execution that is internally provided with for feeding out cabinet 3, and the execution protection circuit 28 includes two poles of isolation
Manage (D0) 10, second breaker (QF2) 11, second fuse (FU2) 12 and discharge examination unit, the voltage dip protection dress
The output end for setting (VSP) 8 successively passes through the 10, second breaker of isolating diode (D0) (QF2) 11 and second fuse (FU2) 12
For inverter supply.The discharge examination unit uses Hall voltage element HOE.Wherein, isolating diode (D0) 10 utilizes list
It realizes and is isolated to the principle of conducting, Hall voltage element HOE real-time detection voltage swing, it is ensured that the reliability of voltage is fed out, it will
The signal detected is transmitted to main monitoring module (GC-MASTER) 14.
Working principle is as follows:
As shown in figure 3, AC power source is converted to DC voltage by charger module (UR) 7 as battery pack BAT charging, electricity
Pond group is monitored by operating condition of the battery cruise instrument 16 to battery pack, and battery pack is voltage dip guarantor by battery protecting circuit
Protection unit (VSP) 8 and power conversion module (BHQ) 9 are powered, and voltage dip protective device (VSP) 8 is after boosting, pressure stabilizing
Voltage is inverter supply by feeding out cabinet 3, and the voltage that battery pack exports is converted to 220VDC by power conversion module (BHQ) 9
As controlling power supply in frequency conversion tank.
Analog detection method is as follows:
When frequency converter works normally, three-phase alternating current input power is cut off, system automatically switches into battery direct current supply,
Guarantee that frequency converter and motor run without interruption before the deadline, wherein frequency converter frequency and motor speed are unchanged.So
After serve three-phase alternating-current supply, frequency converter and motor continue to operate in AC power source working condition.
When AC-input voltage is normal, input voltage, output voltage, DC bus-bar voltage and the control power supply electricity of frequency converter
Pressure is normal, and frequency converter runs well, and voltage dip protective device (VSP) 8 does not put into operation, is in hot stand-by duty；In electricity
When net voltage finds low voltage crossing, there is electric voltage exception in the input voltage of frequency converter, and frequency converter is caused the feelings of under-voltage occur
The frequency converter under-voltage threshold value of condition, general under-voltage threshold value VDC-min direct current 430V(different model is different), voltage is temporary at this time
Drop protective device (VSP) 8, which automatically engages operation, ensures that output voltage, DC bus-bar voltage and control supply voltage keep normal,
Guarantee the working properly of frequency converter.When input ac voltage is restored to normal voltage, the input voltage of frequency converter restores normal
When, voltage dip protective device (VSP) 8 automatically exits from operation, and frequency converter is switched to normal communication power supply, and frequency converter and equipment are all
It runs well, 8 single of voltage dip protective device (VSP) can maintain 40 seconds or more.
It should be noted that voltage dip protective device (VSP) has very reliable insulation blocking to set between 8 and frequency converter
Meter will not influence other frequency converters and operate normally when a frequency converter failure；In Measuring error, every circuit direct current
Support system can be separated individually with bus, in order to repair；Protection frequency converter is had in voltage dip protective device (VSP) 8
Busbar voltage is shaken electricity, power loss, charging voltage and is recorded in real time, can pass through record in subsequent inquiry；Voltage dip protective device (VSP) 8
The DC voltage that frequency converter is supplied to during support is constant, guarantees that frequency converter frequency, motor speed are unchanged；Power quality analysis
Instrument (PQR) 17 can record each voltage dip time, and produce waveform diagram, provide evidence for analysis electric network fault.
The above-mentioned description to embodiment is for that can understand and apply this practical convenient for those skilled in the art
It is novel.Person skilled in the art obviously easily can make various modifications to these embodiments, and illustrating herein
General Principle be applied in other embodiments without having to go through creative labor.Therefore, those skilled in the art are according to this
The announcement of utility model, does not depart from improvement that the utility model scope is made and modification all should be in the protection of the utility model
Within the scope of.
Claims (10)
1. a kind of anti-low voltage ride through device of frequency converter, which is characterized in that including battery cupboard, main control module cabinet and feed out cabinet；
The battery cupboard is internally provided with battery and battery protecting circuit；
The main control module cabinet is internally provided with charger module UR, voltage dip protective device VSP, power conversion module
BHQ, display module HMI, main monitoring module GC-MASTER and signal acquisition module；AC power source by charger module UR with
Battery connection, battery are that voltage dip protective device VSP and power conversion module BHQ powers by battery protecting circuit,
For the out-put supply of the power conversion module BHQ as power supply is controlled in frequency conversion tank, the voltage dip protective device VSP's is defeated
Voltage is inverter supply out；The main monitoring module GC-MASTER connects with display module HMI and signal acquisition module respectively
It connects；
Circuit, the execution protection circuit and voltage dip protective device VSP are protected in the execution that is internally provided with for feeding out cabinet
Output end connection.
2. the anti-low voltage ride through device of frequency converter according to claim 1, which is characterized in that the inside of the battery cupboard is set
It is equipped with battery data logging device, the input terminal of the battery data logging device is connect with battery, the output end of battery data logging device and main monitoring
Module GC-MASTER connection.
3. the anti-low voltage ride through device of frequency converter according to claim 1, which is characterized in that the battery protecting circuit packet
Include first fuse FU1 and the first circuit breaker Q F1, the output end of the battery successively passes through first fuse FU1, first disconnected
Road device QF1 is that voltage dip protective device VSP and power conversion module BHQ powers.
4. the anti-low voltage ride through device of frequency converter according to claim 1, which is characterized in that the main control module cabinet it is interior
Portion is provided with power quality analyzer PQR, and the power quality analyzer PQR is connect with ac bus.
5. the anti-low voltage ride through device of frequency converter according to claim 1, which is characterized in that the signal acquisition module is used
In detection AC-input voltage and average anode current, and the signal real-time Transmission that will test gives main monitoring module GC-MASTER,
The signal acquisition module includes voltage sensor and current sensor.
6. the anti-low voltage ride through device of frequency converter according to claim 1, which is characterized in that the display module HMI is adopted
Use touch screen.
7. the anti-low voltage ride through device of frequency converter according to claim 1, which is characterized in that the voltage dip protection dress
Setting VSP includes boost chopper and isolation circuit.
8. the anti-low voltage ride through device of frequency converter according to claim 7, which is characterized in that the boost chopper packet
Include preliminary filling electrical circuit, the first inductance L1, the second inductance L2, bridge-type IGBT module, the first DC capacitor C1 and the second DC capacitor
C2, the preliminary filling electrical circuit include the normally opened contact KM2 and resistance R1 of the normally opened contact KM1 of the first relay, the second relay,
The normally opened contact KM1 of first relay and the normally opened contact KM2 of the second relay are in parallel, the resistance R1 and the first relay
The normally opened contact KM1 of device connects；The first inductance that the DC power supply of battery output successively passes through preliminary filling electrical circuit, is connected in parallel
L1 and the second inductance L2, bridge-type IGBT module are connect with the first DC capacitor C1 and the second DC capacitor C2 being connected in series；Institute
Stating isolation circuit includes the first counnter attack diode D1 and the second counnter attack diode D2, and the output end of the boost chopper passes through
First counnter attack diode D1 and the second counnter attack diode D2 connects the DC bus of frequency converter.
9. the anti-low voltage ride through device of frequency converter according to claim 1, which is characterized in that circuit packet is protected in the execution
Include the output end of isolating diode D0, the second circuit breaker Q F2 and second fuse FU2, the voltage dip protective device VSP according to
Secondary isolating diode D0, the second circuit breaker Q F2 and the second fuse FU2 of passing through is inverter supply.
10. the anti-low voltage ride through device of frequency converter according to claim 9, which is characterized in that circuit is protected in the execution
Including discharge examination unit, the discharge examination unit uses Hall voltage element HOE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821207142.5U CN208461470U (en) | 2018-07-27 | 2018-07-27 | A kind of anti-low voltage ride through device of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821207142.5U CN208461470U (en) | 2018-07-27 | 2018-07-27 | A kind of anti-low voltage ride through device of frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN208461470U true CN208461470U (en) | 2019-02-01 |
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ID=65178538
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821207142.5U Active CN208461470U (en) | 2018-07-27 | 2018-07-27 | A kind of anti-low voltage ride through device of frequency converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109888805A (en) * | 2019-02-28 | 2019-06-14 | 深圳供电局有限公司 | Voltage sag protection system and method for frequency converter |
| CN113595180A (en) * | 2021-07-16 | 2021-11-02 | 风帆有限责任公司 | Power battery device |
| CN118472995A (en) * | 2024-07-10 | 2024-08-09 | 常州博瑞电力自动化设备有限公司 | Net-structured high-voltage cascading direct-hanging energy storage system |
-
2018
- 2018-07-27 CN CN201821207142.5U patent/CN208461470U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109888805A (en) * | 2019-02-28 | 2019-06-14 | 深圳供电局有限公司 | Voltage sag protection system and method for frequency converter |
| CN113595180A (en) * | 2021-07-16 | 2021-11-02 | 风帆有限责任公司 | Power battery device |
| CN113595180B (en) * | 2021-07-16 | 2024-03-19 | 风帆有限责任公司 | Power battery device |
| CN118472995A (en) * | 2024-07-10 | 2024-08-09 | 常州博瑞电力自动化设备有限公司 | Net-structured high-voltage cascading direct-hanging energy storage system |
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