CN209593273U - A kind of anti-shake electric installation for frequency converter - Google Patents
A kind of anti-shake electric installation for frequency converter Download PDFInfo
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- CN209593273U CN209593273U CN201920252924.9U CN201920252924U CN209593273U CN 209593273 U CN209593273 U CN 209593273U CN 201920252924 U CN201920252924 U CN 201920252924U CN 209593273 U CN209593273 U CN 209593273U
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- direct current
- frequency converter
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- power grid
- valve group
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Abstract
The utility model discloses a kind of anti-shake electric installation for frequency converter, the anti-shake electric installation includes DCC direct current buffer system, and the DCC direct current buffer system includes charging module of the access in parallel on power grid three-phase input voltage node；The charging module is connect by energy-storage module with full control current path module, and the full control current path module includes the direct current valve group of multiple parallel connections, the direct current supply terminal connection of the frequency converter of each direct current valve group corresponding thereto；The DCC direct current buffer system further includes MCU control module, MCU control module is for being persistently monitored the three-phase input voltage of power grid, when monitoring the three-phase input voltage exception of power grid, the full control current path module of control opens direct current valve group, energy-storage module passes through direct current valve group to the corresponding inverter supply of direct current valve group, for maintaining the frequency converter at least uptime of 5s.The utility model can effectively promote the protective capacities that frequency converter shakes electricity to power grid.
Description
Technical field
The utility model belongs to anti-shake electro-technical field more particularly to a kind of anti-shake electric installation for frequency converter.
Background technique
As the complexity of production technology is higher and higher, a large amount of frequency converter is used in production system, and
When applying frequency converter under many flow production line, key production technology thereof section operating conditions, being required to frequency converter can be highly reliably continuous
Operation.However caused network voltage shakes electric problem and sets to critical process section frequency converter as a consequence of an irresistible cause in recent years
Standby continuous highly reliably operation causes tremendous influence, once production suspension induced losses caused by shutting down are huge, so research frequency converter
Anti-shake electric equipment ensures that its normal continuous operation is significant in the case where power grid shakes electric condition.
Frequency converter is isolated operation mode at present, and general direct current component design has the DC storage capacitor of certain capacity
Group, on the one hand steamed bun shape pulsation wave head that these direct current capacitors are used to inhibit to generate after rectification, still further aspect are used for direct current
Energy storage provides the Constant Direct Current energy of rear class inverter, so there is frequency converter certain anti-power grid to shake electric energy power.But due to
DC storage capacitor capacity is limited, and general frequency converter can only bear the power grid within 40mS and shake electricity (or interruption), and for
What network system often occurred is greater than power grid rolling electric situation of the 40mS less than 5s, and frequency converter can be because direct current capacitors energy be insufficient
And under-voltage protection is shut down.It can see from the statistical data of presently relevant authoritative department, the timing time that power grid shakes electricity focuses mostly on
In 50mS-5s, so frequency converter needs to be promoted by other technologies to the protective capacities that power grid shakes electricity.
Summary of the invention
In order to solve the problems in the existing technology, the utility model provides a kind of anti-shake Denso for frequency converter
It sets, the power grid for enabling frequency converter to bear the long period shakes electrical phenomena, effectively promotes the protection energy that frequency converter shakes electricity to power grid
Power.
In order to achieve the above object, the technical solution that the utility model is taken is as follows:
A kind of anti-shake electric installation for frequency converter, including be connected in parallel between power grid three-phase input voltage node and frequency converter
DCC direct current buffer system, the DCC direct current buffer system includes the charging being connected in parallel on power grid three-phase input voltage node
Module；The charging module is connect by energy-storage module with full control current path module, and the full control current path module includes
Multiple direct current valve groups being in parallel, each direct current valve group are connected with the direct current supply terminal of a frequency converter；
The DCC direct current buffer system further includes persistently controlling mould to the MCU that the three-phase input voltage of power grid is monitored
Block, the MCU control module is connected with charging module and full control current path module respectively, when MCU control module monitors
When the three-phase input voltage exception of power grid, control signal is issued to full control current path module；The full control current path module
Direct current valve group is opened after receiving control signal, energy-storage module passes through direct current valve group to inverter supply, to maintain frequency converter extremely
The uptime of few 5s.
Further, the MCU control module controls chip using ARM, and the three-phase input voltage for monitoring power grid is low
In normal alternating current 80% and be electric voltage exception when continuing 20mS or more.
Further, the energy-storage module is direct current capacitors group.
Further, the direct current capacitors group is the DC capacitor of the connection type composition of capacitor simultaneously using two strings ten
Device group.
Further, the capacitor uses the capacitor of 4700 μ F/450 of model.
Further, the charging module uses the charging module of model EVR430-15000B.
Further, the direct current valve group uses IGBT module.
Further, the MCU control module is also circumscribed with the touch screen display unit set and displayed for parameter
HMI。
The utility model has the advantages that compared with prior art, the utility model passes through charging module and energy-storage module first, in power grid electricity
When positive pressure is normal, input alternating current Vin is charged by charging module to energy-storage module, achievees the purpose that energy storage；Then by it is multiple simultaneously
The setting of the direct current valve group of connection, and the direct current supply terminal of the frequency converter by each direct current valve group corresponding thereto connects (its
In each direct current valve group be in close state when voltage is normal), be convenient for electric voltage exception when MCU control module control direct current valve group
It opens, energy-storage module is that its corresponding frequency converter carries out direct current supply by direct current valve group, can effectively promote frequency converter pair
Power grid shakes the protective capacities of electricity；Three-phase input voltage is continued to monitor and judged finally by MCU control module, works as monitoring
To after three-phase input voltage abnormal (80% i.e. lower than normal alternating current is more than a cycle (20mS)), MCU control module is to complete
It controls current path module and issues control signal, complete control after current path module receives control signal opens direct current valve group, energy storage
Module by direct current valve group to the corresponding inverter supply of direct current valve group, for maintain frequency converter at least the normal operation of 5s when
Between；Conversely, the full control current path module of MCU control module control closes straight-wavy valve when monitoring that three-phase input voltage is normal
Group, energy-storage module continue energy storage.
The power grid that anti-shake electric installation described in the utility model enables frequency converter to bear the long period shakes electrical phenomena, effectively
Promote the protective capacities that frequency converter shakes electricity to power grid.
Detailed description of the invention
Fig. 1 is a kind of circuit connection diagram of anti-shake electric installation for frequency converter.
Specific embodiment
The utility model is further elaborated with reference to the accompanying drawings and examples.
Embodiment 1
With reference to Fig. 1, a kind of anti-shake electric installation for frequency converter, including be connected in parallel on power grid three-phase input voltage node and become
DCC direct current buffer system between frequency device；The DCC direct current buffer system includes being connected in parallel on power grid three-phase input voltage node
Charging module R1；The charging module R1 is connect by energy-storage module with full control current path module, and the full control electric current is logical
Road module includes multiple direct current valve groups being in parallel, and each direct current valve group is connect with the direct current supply terminal of a frequency converter；
The DCC direct current buffer system further includes MCU control module, the MCU control module respectively with charging module R1
Connect with full control current path module, and be used to persistently be monitored the three-phase input voltage of power grid, when monitoring power grid
When three-phase input voltage exception, control signal is issued to full control current path module；The full control current path module receives
Direct current valve group is opened after controlling signal, energy-storage module, to the corresponding inverter supply of direct current valve group, is used for by direct current valve group
Maintain the frequency converter at least uptime of 5s.
It should be noted that with reference to Fig. 1, the utility model passes through charging module R1 and energy-storage module first, in power grid electricity
When positive pressure is normal, input alternating current Vin is charged by charging module R1 to energy-storage module, achievees the purpose that energy storage；Then by multiple
The setting of direct current valve group in parallel, and the direct current supply terminal connection of the frequency converter by each direct current valve group corresponding thereto,
Direct current supply is carried out for its corresponding frequency converter by direct current valve group convenient for energy-storage module when electric voltage exception, can effectively be promoted
Frequency converter shakes the protective capacities of electricity to power grid；Three-phase input voltage is continued to monitor and sentenced finally by MCU control module
It is disconnected, after monitoring three-phase input voltage abnormal (80% i.e. lower than normal alternating current is more than a cycle (20mS)), MCU control
Module issues control signal to full control current path module, and complete control after current path module receives control signal opens straight-wavy valve
Group, energy-storage module pass through direct current valve group to the corresponding inverter supply of direct current valve group, for maintaining frequency converter at least 5s just
Normal runing time；Conversely, the full control current path module of MCU control module control is closed when monitoring that three-phase input voltage is normal
Direct current valve group is closed, energy-storage module continues energy storage.
The power grid that anti-shake electric installation described in the utility model enables frequency converter to bear the long period shakes electrical phenomena, effectively
Promote the protective capacities that frequency converter shakes electricity to power grid.
Further, the three-phase input voltage of the power grid refers to that MCU control module monitors voltage lower than normal city extremely
Electricity 80% and continue 20mS or more.
Further, with reference to Fig. 1, the MCU control module controls chip using ARM, and ARM controls the preferred model of chip
The ARM of STM32F427I controls chip.
Further, with reference to Fig. 1, the energy-storage module uses direct current capacitors group C1.
It further, include the connection of 20 capacitors simultaneously using two strings ten with reference to Fig. 1, the direct current capacitors group C1
The direct current capacitors group that mode forms, the capacitor of the preferred 4700 μ F/450 of model of capacitor.
Further, the charging module R1 uses the charging module of model EVR430-15000B.
Further, with reference to Fig. 1, the direct current valve group uses IGBT module, the preferred model of IGBT module
The IGBT module of FF150R12KT4.
With reference to Fig. 1, under normal electricity consumption situation, three-phase input voltage Vin by normal supply access to frequency converter VFD1,
VFD2...VFDn powers, and is the schematic diagram of anti-shake electric equipment DCC direct current buffer system in Fig. 1 dashed box, inputs alternating current Vin at this time
It is charged by charging module R1 to direct current capacitors group C1, achievees the purpose that energy storage, and DCC direct current buffer system direct current output is logical
Cross direct current valve group D1, D2...Dn connection with direct current valve group relative to frequency converter VFD1, VFD2...VFDn direct current supply
Terminal connection.Under normal electricity consumption situation, MCU control module persistently monitors network voltage, once there are line voltage abnormal conditions
(general voltage, which is lower than the 80% of normal alternating current and continues 20mS or more, then thinks city's electrical anomaly), MCU control module is in 5mS
Issue control signal open direct current valve group D1, D2...Dn, by DC storage capacitor group C1 by direct current valve group to the back-end with it is straight
Corresponding frequency converter VFD1, VFD2...VFDn power supply of valve group is flowed, to inhibit power grid to shake influence of the electricity to frequency converter.When MCU is controlled
Molding block monitor network voltage it is normal when, controller MCU1 issue control signal-off straight-wavy valve D1, D2...Dn so that DCC
Direct current buffer system is returned to charged state, and is persistently monitored to network voltage.
It should be noted that designing the DC storage capacitor group of DCC direct current buffer system under conventional operating condition can support
Frequency converter normal operation for 5 seconds in rear end can pass through the DC energy storage for increasing DC storage capacitor group under special operation condition
Capacity ensures frequency converter operation 10 minutes or the longer time.DC energy storage element is typically chosen the thin-film capacitor lasted a long time,
Duration if necessary is longer, then is changed to electrolytic capacitor or battery group.
Embodiment 2
On the basis of embodiment 1, for the ease of the display of parameter and setting, the MCU control module is also external useful
In the touch screen display unit HMI of parameter set and displayed, the preferred model DOP-B07S411 of touch screen display unit HMI
Touch screen, in addition to carry out complexes three-phase input voltage, running current, each valve group state display other than, can also set
Set operating parameter and the protection threshold value etc. of device.
The power grid that anti-shake electric installation described in the utility model enables frequency converter to bear the long period shakes electrical phenomena, effectively
Promote the protective capacities that frequency converter shakes electricity to power grid.
It is preferred embodiments of the present invention above, it is noted that for those skilled in the art
For, without departing from the principle of this utility model, several improvements and modifications can also be made, these improvements and modifications
It is considered as the protection scope of the utility model.
Claims (8)
1. a kind of anti-shake electric installation for frequency converter, it is characterised in that: including be connected in parallel on power grid three-phase input voltage node with
DCC direct current buffer system between frequency converter；The DCC direct current buffer system includes being connected in parallel on power grid three-phase input voltage node
On charging module；The charging module is connect by energy-storage module with full control current path module, the full control current path
Module includes multiple direct current valve groups being in parallel, and each direct current valve group is connected with the direct current supply terminal of a frequency converter；
The DCC direct current buffer system further includes the MCU control module being persistently monitored to the three-phase input voltage of power grid, institute
It states MCU control module to be connected with charging module and full control current path module respectively, when MCU control module monitors power grid
When three-phase input voltage exception, control signal is issued to full control current path module；The full control current path module receives
Direct current valve group is opened after controlling signal, energy-storage module passes through direct current valve group to inverter supply, to maintain frequency converter at least 5s's
Uptime.
2. a kind of anti-shake electric installation for frequency converter according to claim 1, it is characterised in that: the MCU controls mould
Block controls chip using ARM, and the three-phase input voltage for monitoring power grid is lower than the 80% of normal alternating current and continues 20mS or more
When be electric voltage exception.
3. a kind of anti-shake electric installation for frequency converter according to claim 1, it is characterised in that: the energy-storage module is
Direct current capacitors group.
4. a kind of anti-shake electric installation for frequency converter according to claim 3, it is characterised in that: the direct current capacitors
Group is the direct current capacitors group of the connection type composition of capacitor simultaneously using two strings ten.
5. a kind of anti-shake electric installation for frequency converter according to claim 4, it is characterised in that: the capacitor uses
The capacitor of 4700 μ F/450 of model.
6. a kind of anti-shake electric installation for frequency converter according to claim 1, it is characterised in that: the charging module is adopted
With the charging module of model EVR430-15000B.
7. a kind of anti-shake electric installation for frequency converter according to claim 1, it is characterised in that: the direct current valve group is adopted
Use IGBT module.
8. a kind of anti-shake electric installation for frequency converter according to claim 1, it is characterised in that: the MCU controls mould
Block is also circumscribed with the touch screen display unit HMI set and displayed for parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920252924.9U CN209593273U (en) | 2019-02-28 | 2019-02-28 | A kind of anti-shake electric installation for frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920252924.9U CN209593273U (en) | 2019-02-28 | 2019-02-28 | A kind of anti-shake electric installation for frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209593273U true CN209593273U (en) | 2019-11-05 |
Family
ID=68370940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920252924.9U Active CN209593273U (en) | 2019-02-28 | 2019-02-28 | A kind of anti-shake electric installation for frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209593273U (en) |
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2019
- 2019-02-28 CN CN201920252924.9U patent/CN209593273U/en active Active
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