CN109787534A - A kind of frequency converter and frequency-converting control device powered using high voltage direct current - Google Patents
A kind of frequency converter and frequency-converting control device powered using high voltage direct current Download PDFInfo
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- CN109787534A CN109787534A CN201910150312.3A CN201910150312A CN109787534A CN 109787534 A CN109787534 A CN 109787534A CN 201910150312 A CN201910150312 A CN 201910150312A CN 109787534 A CN109787534 A CN 109787534A
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Abstract
The embodiment of the invention discloses a kind of frequency converters and frequency-converting control device powered using high voltage direct current, wherein frequency converter includes: first voltage converter and inverter；The output end of inverter is connected with motor；The input terminal of the first voltage converter is for inputting high-voltage direct current.Voltage conversion and inversion, output voltage and the adjustable alternating current of frequency are successively carried out to high-voltage direct current by frequency converter, motor is controlled.The frequency converter of the present embodiment eliminates rectifier in the prior art, simplifies frequency changer under the premise of realizing variable voltage variable frequency function；And the present embodiment combines high voltage direct current power supply module with the frequency converter powered using high voltage direct current, instead of the combination of uninterruptible power supply and traditional frequency conversion device, eliminate the rectifier in the inverter and traditional frequency conversion device in uninterruptible power supply, simplify structure, reduce the number of processes to input AC electricity, energy consumption is reduced, the power supply efficiency of motor is improved.
Description
Technical field
The present embodiments relate to converter technology field more particularly to it is a kind of using high voltage direct current power supply frequency converter and
Frequency-converting control device.
Background technique
Frequency converter (Variable-frequency Drive, VFD) is using converter technique and microelectric technique, by changing
Power transformation motivation frequency mode of working power supply controls the electric control appliance of ac motor.For example, in the large size of data center
In water-cooling system, for preferably energy conservation and control, pump motor is controlled using frequency converter, realizes the pressure of data center end
Difference and flow control.
As shown in Figure 1, traditional frequency converter includes sequentially connected rectifier, electric pressure converter (DC-DC) and inverter
(DC-AC), alternating current is input in frequency converter, rectified, transformation and inverter operation output voltage and the adjustable alternating current of frequency,
To carry out frequency conversion and speed regulating control to motor.
But existing frequency converter needs repeatedly to handle alternating current, energy consumption is higher, so that the power supply of motor is imitated
Rate is lower.
Summary of the invention
The embodiment of the present invention provides a kind of frequency converter and frequency-converting control device powered using high voltage direct current, to provide one kind
The frequency conversion of energy-efficient motor, voltage control scheme.
In a first aspect, the embodiment of the invention provides a kind of frequency converters powered using high voltage direct current, comprising: first voltage
Converter, and the inverter being connected with the output end of the first voltage converter；
The output end of the inverter is connected with motor；
The input terminal of the first voltage converter is for inputting high-voltage direct current.
Second aspect, the embodiment of the invention also provides a kind of frequency-converting control devices powered using high voltage direct current, comprising:
The frequency converter and high voltage direct current power supply module powered described in any embodiment using high voltage direct current；
The output end of the high voltage direct current power supply module is connected with the input terminal of frequency converter, to input high straightening to frequency converter
Galvanic electricity stream.
The embodiment of the invention provides a kind of frequency converter powered using high voltage direct current, which includes the to be connected
One electric pressure converter and inverter, the input of frequency converter are high-voltage direct current, by frequency converter to high-voltage direct current successively
Voltage conversion and inversion, output voltage and the adjustable alternating current of frequency are carried out, to carry out frequency conversion and speed regulating control to motor.This
The frequency converter that embodiment provides eliminates rectifier in the prior art, simplifies under the premise of realizing variable voltage variable frequency function
Frequency changer reduces energy consumption, improves the power supply efficiency of motor.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of frequency converter in the prior art；
Fig. 2 is a kind of structural schematic diagram for frequency converter using high voltage direct current power supply that the embodiment of the present invention one provides；
Fig. 3 a is the structural schematic diagram of the first frequency converter powered using high voltage direct current provided by Embodiment 2 of the present invention；
Fig. 3 b is the structural schematic diagram of the second provided by Embodiment 2 of the present invention frequency converter using high voltage direct current power supply；
Fig. 3 c is the structural schematic diagram of the third frequency converter powered using high voltage direct current provided by Embodiment 2 of the present invention；
Fig. 4 is a kind of structural representation for frequency-converting control device using high voltage direct current power supply that the embodiment of the present invention three provides
Figure；
Fig. 5 a is that a kind of structure for frequency-converting control device using high voltage direct current power supply that the embodiment of the present invention four provides is shown
It is intended to；
Fig. 5 b is the structure for the frequency-converting control device that the another kind that the embodiment of the present invention four provides is powered using high voltage direct current
Schematic diagram.
Wherein, 10, frequency converter；11, first voltage converter；12, inverter；13, frequency modulation logic controller；131, hilted broadsword
Commutator；20, motor；30, host computer；40, high voltage direct current power supply module；41, rectifier；42, second voltage converter；
43, battery pack；50, power grid.
Specific embodiment
The embodiment of the present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this
Locate described specific embodiment and is used only for explaining the embodiment of the present invention, rather than the restriction to the embodiment of the present invention.In addition also
It should be noted that only parts related to embodiments of the present invention are shown rather than entire infrastructure for ease of description, in attached drawing.
Embodiment one
Fig. 2 is a kind of structural schematic diagram for frequency converter using high voltage direct current power supply that the embodiment of the present invention one provides.Knot
Fig. 2 is closed, frequency converter 10 includes: first voltage converter (DC-DC) 11 and inverter (DC-AC) 12.
In order to facilitate describing and distinguish, the electric pressure converter in frequency converter 10 is known as first voltage converter 11.First electricity
Pressure converter 11 is a kind of device of electric energy that the electric energy of a voltage value is become to another voltage value in DC circuit, packet
Include boost converter, buck converter and type of voltage step-up/down converter.Optionally, first voltage converter 11 can be input voltage
Be converted to the converter of a fixed voltage, or the conversion adjustable converter of voltage.
First voltage converter 11 includes input terminal and output end, wherein input terminal is for inputting high-voltage direct current.Example
Such as, it is capable of providing the power supply unit of high-voltage direct current, in input terminal connection to input high-voltage direct current.Output end and inversion
The input terminal of device 12 is connected, and the high-voltage direct current after converting the voltage into is input to inverter 12.The output end of inverter 12 with
Motor 20 is connected.Wherein, inverter 12 be direct current energy (battery, battery) is transformed into alternating current (generally 220V,
50Hz sine wave) equipment.It is made of inverter bridge, control logic and filter circuit.In the present embodiment, inverter 12 is by first
The high voltage direct current that electric pressure converter 11 transmits, is converted to alternating current, and alternating current is input in motor 20.The present embodiment
In, inverter 12 is variable-frequency inverter 12, and the ac frequency of output is adjusted.
The embodiment of the invention provides a kind of frequency converter 10 powered using high voltage direct current, which includes being connected
First voltage converter 11 and inverter 12, the input of frequency converter 10 is high-voltage direct current, by frequency converter 10 to high pressure
DC current successively carries out voltage conversion and inversion, output voltage and the adjustable alternating current of frequency, to become to motor 20
Frequency and speed regulating control.Frequency converter 10 provided in this embodiment eliminates the prior art under the premise of realizing variable voltage variable frequency function
In rectifier, simplify 10 structure of frequency converter, while reducing energy consumption, improve motor 20 power supply efficiency.
Embodiment two
On the basis of the above embodiment 1, the present embodiment illustratively shows three kinds of changes using high voltage direct current power supply
The structure of frequency device.Fig. 3 a is the structural representation of the first frequency converter powered using high voltage direct current provided by Embodiment 2 of the present invention
Figure, Fig. 3 b are the structural schematic diagram of the second provided by Embodiment 2 of the present invention frequency converter using high voltage direct current power supply, Fig. 3 c
It is the structural schematic diagram of the third frequency converter powered using high voltage direct current provided by Embodiment 2 of the present invention.
In conjunction with Fig. 3 a- Fig. 3 c, frequency modulation logic controller 13 is increased on the basis of Fig. 2, frequency modulation logic controller 13
Input terminal is connected with the motor 20 or host computer 30, output end and the inverter 12 and/or first voltage converter
11 are connected.Specifically, in fig. 3 a, the input terminal of frequency modulation logic controller 13 passes through single-pole double-throw switch (SPDT) 131 and motor
20 are connected with host computer 30.When single-pole double-throw switch (SPDT) 131 connects the contact A, frequency modulation logic controller 13 is connected with motor 20；
When single-pole double-throw switch (SPDT) 131 connects B contact, frequency modulation logic controller 13 is connected with host computer 30.
It is worth noting that the frequency modulation logic controller 13 shown in Fig. 3 a can be by single-pole double-throw switch (SPDT) 131 electronic
It is switched between machine 20 and host computer 30, but not limited to this.Frequency modulation logic controller 13 can pass through wired mode or nothing
Line mode only connects motor 20, can also only connect host computer 30 by wired or wireless mode.
Frequency modulation logic controller 13 is used to acquire the expected frequency of motor 20, alternatively, the expectation control of acquisition motor 20
Parameter processed, and expected frequency is calculated according to the desired control parameter.Specifically, frequency modulation logic controller 13 is in real time from electronic
Perhaps host computer 30 acquires the expected frequency or acquire in real time from motor 20 or host computer 30 that motor 20 needs to machine 20
Desired control parameter of motor 20, such as expectation flow control parameter, preferred temperature control parameter etc., further according to desired control
Parameter calculates expected frequency.Such as according to 0.1 tph of desired flow, calculate 100 hertz of expected frequency.It is worth explanation
, the method and the structure of motor 20, the control logic phase of control system of expected frequency are calculated according to desired control parameter
It closes, those skilled in the art can calculate expected frequency using existing motor control method, and details are not described herein again.
The output end of frequency modulation logic controller 13 is connected with inverter 12.Frequency modulation logic controller 13 is also used to it is expected frequency
Rate feeds back to the inverter 12, to adjust the output frequency of the inverter 12.Specifically, inverter 12 is controlled including frequency
The output end of device (not shown), frequency modulation logic controller 13 is connect with the frequency controller of inverter 12, is used for expected frequency
It feeds back in the frequency controller of inverter 12.Frequency controller adjusts the inverter 12 according to the expected frequency received
Output frequency.
Similarly with Fig. 3 a, in fig 3b, the input terminal of frequency modulation logic controller 13 passes through single-pole double-throw switch (SPDT) 131 and electricity
Motivation 20 is connected with host computer 30, but not limited to this.Frequency modulation logic controller 13 can pass through wired mode or wireless mode
Motor 20 is only connected, host computer 30 can also only be connected by wired or wireless mode.
The frequency modulation logic controller 13 is used to acquire the expectation voltage of motor 20, alternatively, the phase of acquisition motor 20
It hopes control parameter, and desired voltage is calculated according to the desired control parameter.Specifically, frequency modulation logic controller 13 in real time from
Perhaps host computer 30 acquires the expectation voltage of the needs of motor 20 or in real time from motor 20 or host computer 30 motor 20
Desired control parameter of motor 20, such as expectation flow control parameter, preferred temperature control parameter etc. are acquired, further according to expectation
Control parameter calculates desired voltage.It is worth noting that according to desired control parameter calculate expectation voltage method with it is electronic
Structure, the control logic of control system of machine 20 are related, and those skilled in the art can use existing motor control method meter
Expectation voltage is calculated, details are not described herein again.
The output end of frequency modulation logic controller 13 is connected with first voltage converter 11.Frequency modulation logic controller 13 is also used to
By the expectation Voltage Feedback to first voltage converter 11, to adjust the output voltage of first voltage converter 11.Specifically,
First voltage converter 11 includes voltage controller (not shown), and the output end and first voltage of frequency modulation logic controller 13 are converted
The voltage controller of device 11 connects, for Voltage Feedback will it is expected into the voltage controller of first voltage converter 11.Voltage
Controller adjusts the output voltage of first voltage converter 11 according to the expectation voltage received.
Complex chart 3a and Fig. 3 b, Fig. 3 c provide one kind based on the feedback signal while realizing the frequency converter 10 of transformation and frequency conversion
Structure.The input terminal of frequency modulation logic controller 13 is connected with the motor 20 or host computer 30.It will be in Fig. 3 a and Fig. 3 b
The input terminal of structure composition, frequency modulation logic controller 13 can also pass through single-pole double-throw switch (SPDT) 131 (as shown in Figure 3c), Huo Zhetong
Cross it is wired, be wirelessly connected with motor 20 and host computer 30.
Frequency modulation logic controller 13 is used to acquire the expectation voltage and expected frequency of motor 20, alternatively, acquisition motor
20 desired control parameter, and desired voltage and expected frequency are calculated according to the desired control parameter.Specifically, frequency modulation is patrolled
Volume controller 13 in real time from motor 20 perhaps host computer 30 acquire expectation voltage and expected frequency that motor 20 needs or
The desired control parameter of motor 20, such as expectation flow control parameter, phase are acquired from motor 20 or host computer 30 in real time
It hopes temperature control parameter etc., calculates desired voltage and expected frequency further according to desired control parameter.
The output end of frequency modulation logic controller 13 is connected with the first voltage converter 11 and the inverter 12 respectively.
Frequency modulation logic controller 13 is also used to it is expected Voltage Feedback to first voltage converter 11, it would be desirable to which frequency feedback is to described inverse
Become device 12, to adjust the output voltage of first voltage converter 11 and the output frequency of inverter 12.Specifically, frequency modulation logic
The frequency control with the voltage controller (not shown) of first voltage converter 11 and inverter 12 respectively of the output end of controller 13
Device (not shown) connection processed, for Voltage Feedback will it is expected into voltage controller, it would be desirable to frequency feedback to frequency controller
In.Voltage controller adjusts the output voltage of first voltage converter 11 according to the expectation voltage received；Frequency controller root
According to the expected frequency received, the output frequency of inverter 12 is adjusted.
In the embodiment of the present invention, voltage and/or expected frequency it is expected by the feedback of frequency modulation logic controller 13, to close
Ring controls the output voltage and output frequency of frequency converter 10, realizes the automatic pressure-transforming frequency control of motor 20.
Embodiment three
Fig. 4 is a kind of structural representation for frequency-converting control device using high voltage direct current power supply that the embodiment of the present invention three provides
Figure.Frequency-converting control device provided in this embodiment includes the frequency converter 10 powered using high voltage direct current that the various embodiments described above provide
And high voltage direct current power supply module 40.
Wherein, high voltage direct current power supply module 40 does not power to high voltage direct current for exporting high-voltage direct current, the present embodiment
The structure of module 40 is defined, and any module that can export high-voltage direct current is in the protection scope of the present embodiment.
The output end of high voltage direct current power supply module 40 is connected with the input terminal of frequency converter 10, is connected especially by DC bus, with to change
Frequency device 10 inputs high-voltage direct current.DC bus can effectively improve the power consumption efficiency of frequency-converting control device.In conjunction with above-mentioned each
The structure for the frequency converter 10 that embodiment provides, Fig. 4 are high by taking frequency converter 10 includes first voltage converter 11 and inverter 12 as an example
The output end of straightening stream power supply module 40 is connected with the input terminal of first voltage converter 11.
The output end of frequency-converting control device, i.e., the output end of inverter 12 connects motor 20 in frequency converter 10, passes through height
Straightening stream power supply module 40 and the combined scheme of frequency converter 10 guarantee electricity while output voltage and frequency adjustable alternating current
The backup power supply of motivation 20；Meanwhile energy consumption is reduced, improve the power supply efficiency of motor 20.
Example IV
Fig. 5 a is that a kind of structure for frequency-converting control device using high voltage direct current power supply that the embodiment of the present invention four provides is shown
It is intended to, Fig. 5 b is the structural representation for the frequency-converting control device that the another kind that the embodiment of the present invention four provides is powered using high voltage direct current
Figure.The present embodiment illustratively provides the structure of several high voltage direct current power supply modules 40.
As shown in Figure 5 a, high voltage direct current power supply module 40 includes rectifier (AC-DC) 41 and second voltage converter (DC-
DC) 42, it describes and distinguishes for convenience, the electric pressure converter in high voltage direct current power supply module 40 is known as second voltage converter
42.Wherein, the input terminal of rectifier 41 is connected with power grid 50, for the High Level AC Voltage inputted from power grid 50 to be converted into high pressure
Direct current.The output end of rectifier 41 is connected with second voltage converter 42, for high voltage direct current to be input to second voltage
In converter 42.The output end of the second voltage converter 42 is connected with the input terminal of the first voltage converter 11, uses
After by high voltage direct current transformation, output carries out transformation and inversion into frequency converter 10.
Fig. 5 b increases battery pack 43 on the basis of Fig. 5 a.In conjunction with Fig. 5 b, high voltage direct current power supply module 40 includes rectification
Device 41, second voltage converter 42 and battery pack 43.Wherein, battery pack 43 includes multiple being serially connected, being in parallel or series-parallel
Battery.The anode of the battery pack 43 is connected with the anode of high voltage direct current output module, the cathode of the battery pack 43 and institute
The cathode for stating high voltage direct current output module is connected.
In 50 normal power supply of power grid, rectification and change of the alternating current through high voltage direct current power supply module 40 that power grid 50 provides
Pressure, is converted to high voltage direct current, stores into battery pack 43, and be input in frequency converter 10 by DC bus, by frequency conversion
The transformation and inversion of device 10, output voltage and the adjustable alternating current of frequency are into motor 20.When power grid 50 powers off, battery pack
43 input high voltage direct current, by the transformation and inversion of frequency converter 10, output voltage and frequency to frequency converter 10 by DC bus
The adjustable alternating current of rate is into motor 20, from regardless of being capable of providing uninterruptible power supply extremely whether power grid 50 powers normal
In frequency converter 10, guarantee the normal work of motor 20.
Those skilled in the art are, it should be understood that existing uninterruptible power supply (Uninterruptible Power System/
Uninterruptible Power Supply, UPS) it include sequentially connected rectifier, electric pressure converter and inverter.This reality
Apply example offer high voltage direct current power supply module 40 only include rectifier 41 and second voltage converter 42, compared to it is existing not between
Power-off source, eliminates inverter, simplifies the structure of high voltage direct current power supply module 40；Pass through high voltage direct current power supply module and this reality
The frequency converter combination for applying example offer, instead of the combination of UPS and traditional frequency conversion device, the inverter and tradition eliminated in UPS becomes
Rectifier in frequency device, simplifies structure, reduces the number of processes to input AC electricity, reduces energy consumption, improves motor 20
Power supply efficiency.
The frequency-converting control device using high voltage direct current power supply that the various embodiments described above provide can be applicable to the water of data center
In cooling system, it is based on this, motor 20 includes the terminal water pump in data center's water-cooling system, and power grid 50 uses state's net electric power,
Then rectifier 41 is three-phase rectifier, and inverter 12 is three-phase inverter.It is provided in an embodiment of the present invention to be supplied using high voltage direct current
The combination of the high voltage direct current power supply module 40 of electricity and the frequency converter 10 using high voltage direct current power supply, compared to existing UPS
With the combination of traditional frequency conversion device shown in fig. 1, the demand of terminal water pump backup power supply had not only been met, but also had been eliminated in UPS
Inverter and traditional frequency conversion device in rectifier, reduce power conversion link, improve power supply efficiency, general 6%；Together
When, original logic can be still continued to use in the control logic and control mode of frequency conversion and transformation.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. it is a kind of using high voltage direct current power frequency converter characterized by comprising first voltage converter, and with it is described
The connected inverter of the output end of first voltage converter；
The output end of the inverter is connected with motor；
The input terminal of the first voltage converter is for inputting high-voltage direct current.
2. frequency converter according to claim 1, which is characterized in that the frequency converter further includes frequency modulation logic controller；
The input terminal of the frequency modulation logic controller is connected with the motor or host computer, the frequency modulation logic controller
Output end is connected with the inverter；
The frequency modulation logic controller is used to acquire the expected frequency of motor, alternatively, the desired control parameter of acquisition motor,
And expected frequency is calculated according to the desired control parameter；The expected frequency is fed back into the inverter, to adjust
State the output frequency of inverter.
3. frequency converter according to claim 1, which is characterized in that the frequency converter further includes frequency modulation logic controller；
The input terminal of the frequency modulation logic controller is connected with the motor or host computer, the frequency modulation logic controller
Output end is connected with the first voltage converter；
The frequency modulation logic controller is used to acquire the expectation voltage of motor, alternatively, the desired control parameter of acquisition motor,
And desired voltage is calculated according to the desired control parameter；By the expectation Voltage Feedback to first voltage converter, to adjust
Save the output voltage of first voltage converter.
4. frequency converter according to claim 1, which is characterized in that the frequency converter further includes frequency modulation logic controller；
The input terminal of the frequency modulation logic controller is connected with the motor or host computer, the frequency modulation logic controller
Output end is connected with the first voltage converter and the inverter respectively；
The frequency modulation logic controller is used to acquire the expectation voltage and expected frequency of motor, alternatively, the phase of acquisition motor
It hopes control parameter, and desired voltage and expected frequency is calculated according to the desired control parameter；By the expectation Voltage Feedback
To first voltage converter, the expected frequency is fed back into the inverter, to adjust the output electricity of first voltage converter
The output frequency of pressure and inverter.
5. a kind of frequency-converting control device powered using high voltage direct current, which is characterized in that including described in claim any one of 1-4
Using high voltage direct current power frequency converter and high voltage direct current power supply module；
The output end of the high voltage direct current power supply module is connected with the input terminal of frequency converter, to input high voltage direct current to frequency converter
Stream.
6. device according to claim 5, which is characterized in that the high voltage direct current power supply module include rectifier and with
The connected second voltage converter of the output end of the rectifier；
The input terminal of the rectifier is connected with power grid；
The output end of the second voltage converter is connected with the input terminal of the first voltage converter.
7. device according to claim 6, which is characterized in that the high voltage direct current power supply module further includes battery pack；
The anode of the battery pack is connected with the anode of high voltage direct current output module, the cathode of the battery pack and the high straightening
The cathode for flowing output module is connected.
8. device according to claim 6 or 7, which is characterized in that the inverter is three-phase inverter, the rectifier
For three-phase rectifier.
9. according to the described in any item devices of claim 5-7, which is characterized in that the output end of high voltage direct current power supply module and change
The input terminal of frequency device is connected by DC bus.
10. according to the described in any item devices of claim 5-7, which is characterized in that the motor includes data center's water cooling
Terminal water pump in system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910150312.3A CN109787534A (en) | 2019-02-28 | 2019-02-28 | A kind of frequency converter and frequency-converting control device powered using high voltage direct current |
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| CN201910150312.3A CN109787534A (en) | 2019-02-28 | 2019-02-28 | A kind of frequency converter and frequency-converting control device powered using high voltage direct current |
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| CN112202195A (en) * | 2020-09-10 | 2021-01-08 | 深圳供电局有限公司 | Converter station control method, converter station control device, computer equipment and readable storage medium |
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Application publication date: 20190521 |
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| RJ01 | Rejection of invention patent application after publication |