CN109861534A - Compensation device temporarily drops in DC voltage and compensation method temporarily drops in DC voltage - Google Patents
Compensation device temporarily drops in DC voltage and compensation method temporarily drops in DC voltage Download PDFInfo
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- CN109861534A CN109861534A CN201910189443.2A CN201910189443A CN109861534A CN 109861534 A CN109861534 A CN 109861534A CN 201910189443 A CN201910189443 A CN 201910189443A CN 109861534 A CN109861534 A CN 109861534A
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Abstract
The present invention, which discloses a kind of DC voltage and temporarily drops compensation device, controller, DC voltage, temporarily drops compensation method.Wherein, compensation device temporarily drops in DC voltage, it include: first switch tube, first switch tube anti-paralleled diode, second switch, second switch anti-paralleled diode, inductance and supercapacitor group and controller, first switch tube is connected in parallel with first switch tube anti-paralleled diode, second switch is connected in parallel with second switch anti-paralleled diode, the supercapacitor group is as energy-storage units, the inductance, the first switch tube and its anti-paralleled diode and the second switch and its anti-paralleled diode form two-way DC/DC topological circuit and carry out charge and discharge, realize energy in bidirectional flow.By the above-mentioned means, can be realized DC voltage temporarily drop compensation device structure it is simple, small in size and at low cost.
Description
Technical field
The present invention relates to technical field of electric power, temporarily drop compensation device more particularly to a kind of DC voltage and DC voltage is temporary
Compensation method is dropped.
Background technique
With the arrival of information age, more and more precision electrical equipments are put into power grid, these precision equipments
It is difficult to work normally in biggish voltage change range, therefore inhibits load supplying Voltage Drop particularly important.Existing one
It is to install compensation equipment additional in load-side, and install DVR (Dynamic Voltage in load-side that kind, which inhibits the measure of Voltage Drop,
Compensation device temporarily drops in Regulator, DC voltage) it is one of current balanced load most effective measure of voltage.
Referring to Figure 1, Fig. 1 is the structural schematic diagram of existing voltage sag compensation device.As shown in Figure 1, the voltage dip
Compensation device includes energy-storage units, inversion unit, filter, series transformer and the charging circuit for energy-storage units charging.Its
In, charging circuit can charge when network voltage is normal for energy-storage units, and energy-storage units are followed by inversion unit, and direct current is turned
Change alternating current into, inversion unit is followed by filter, for filtering out higher hamonic wave, the voltage dip is mended through transformer after filter
Device is repaid to be connected in power grid.Since single-phase earthing is the most common failure of electric system, in the voltage sag compensation device
Inversion unit is usually needed using three independent single-phase inverters, can inject positive sequence, negative phase-sequence and residual voltage for route.The electricity
The working principle that compensation device temporarily drops in pressure includes that when the grid voltage is normal, charging circuit can charge for energy-storage units, works as electricity
When net Voltage Drop, direct current is converted to alternating current, then through transformer and load in series, mentioned for load by inversion unit work
For the adjustable alternating voltage of phase and amplitude, achieve the purpose that frequency converter busbar voltage is inhibited to fall.But existing voltage
Temporarily drop compensation device needs three independent single-phase inverters and additional charging circuit, leads to existing voltage dip compensation dress
Set that structure is complicated, volume is big and at high cost.
Summary of the invention
It is an object of the invention to propose that compensation device temporarily drops in a kind of DC voltage and compensation method, energy temporarily drop in DC voltage
Enough realize DC voltage temporarily drop compensation device structure it is simple, small in size and at low cost.
On the one hand the embodiment of the present invention, provides a kind of DC voltage and temporarily drops compensation device, comprising:
First switch tube, first switch tube anti-paralleled diode, second switch, second switch anti-paralleled diode,
Inductance, supercapacitor group and controller；
First switch tube is connected in parallel with first switch tube anti-paralleled diode, and second switch and second switch are instead simultaneously
Union II pole pipe is connected in parallel, and the circuit that supercapacitor group, inductance and first switch tube are followed in series to form is as a whole
It is connected in series with second switch, is subsequently used for connecing at frequency changer direct current bus both ends；
Inductance, first switch tube, first switch tube anti-paralleled diode, second switch and second switch inverse parallel two
Pole pipe forms two-way DC/DC topological circuit and carries out charge and discharge, the voltage of the first input end access supercapacitor group of controller
Signal, the second input terminal of controller are used to access the voltage signal of frequency changer direct current bus, and the output end of controller connects respectively
First switch tube and second switch are connect, for the electricity according to frequency changer direct current bus voltage signal and supercapacitor group both ends
Press the on off operating mode of signal control first switch tube and second switch.
On the other hand, the embodiment of the invention also provides a kind of DC voltages temporarily to drop compensation method, comprising:
The voltage signal of sampling frequency converter DC bus and the voltage signal at supercapacitor group both ends, sample two-way DC
The current signal of the inductance of DC topological circuit；
According to the state of the frequency changer direct current bus voltage status of monitoring and supercapacitor group, frequency changer direct current bus
Voltage signal, the voltage signal of supercapacitor group and two-way DC DC topological circuit inductance current signal, generate first adjust
Wave processed or the second modulating wave；
The first driving signal is generated according to the first modulating wave and preset triangular wave, and using the first driving signal control the
One switching tube turns on and off, or, generate the second driving signal according to the second modulating wave and preset triangular wave, and using the
Two driving signal control second switch turns on and off.
Frequency changer direct current bus voltage status and supercapacitor group voltage status are monitored in one of the embodiments,
Step includes:
The voltage signal of frequency changer direct current bus is compared with temporary drop voltage threshold；
The voltage signal of supercapacitor group and full voltage preset value are compared；
According to comparison result, frequency changer direct current bus voltage status and supercapacitor group voltage status are judged.
In one of the embodiments, according to comparison result, frequency changer direct current bus voltage status and super capacitor are judged
The step of device group voltage status includes:
If the voltage of frequency changer direct current bus is higher than temporarily drop voltage threshold and the voltage at supercapacitor group both ends is lower than
Full voltage preset value then determines that the voltage of current frequency changer direct current bus is normal and the underfill of supercapacitor group is electric.
In one of the embodiments, according to comparison result, frequency changer direct current bus voltage status and super capacitor are judged
The step of device group voltage status includes:
If the voltage of frequency changer direct current bus is higher than temporarily drop voltage threshold and the voltage at supercapacitor group both ends is not low
In full voltage preset value, then determine that the voltage of current frequency changer direct current bus is normal and supercapacitor group is fully charged.
In one of the embodiments, according to comparison result, frequency changer direct current bus voltage status and super capacitor are judged
The step of device group voltage status includes:
If the voltage of frequency changer direct current bus determines the voltage of current frequency changer direct current bus lower than temporarily drop voltage threshold
Fall.
In one of the embodiments, according to frequency changer direct current bus voltage status and supercapacitor group voltage status,
The voltage signal of frequency changer direct current bus and two-way DC DC topological circuit inductance current signal, generate the first modulating wave, packet
It includes:
If the Voltage Drop of current frequency changer direct current bus, second switch shutdown is controlled, makes second switch instead simultaneously
Union II pole pipe is connected into circuit；
According to the voltage signal of frequency changer direct current bus and two-way DC DC topological circuit inductance current signal by default
The first modulating wave generate model generate the first modulating wave Um1, preset first modulating wave generation model are as follows:
Iref=KVp1*(Udc-Uf_dc)+KVi1*∑(Udc-Uf_dc)；
Um1=KIp1*(Iref-If_L)+KIi1*∑(Iref-If_L)；
Wherein, KVp1For preset Voltage loop proportionality coefficient, KVi1For preset Voltage loop integral coefficient, UdcTemporarily to drop voltage
Threshold value, Uf_dcFor the voltage signal for sampling obtained frequency changer direct current bus, IrefFor given value of current, If_LTo sample obtained electricity
The current signal of sense, KIp1For preset electric current loop proportionality coefficient, KIi1For preset electric current loop integral coefficient.
In one of the embodiments, according to frequency changer direct current bus voltage status and supercapacitor group voltage status,
The voltage signal of supercapacitor group and two-way DC DC topological circuit inductive current, generate the second modulating wave Um2, comprising:
If the voltage of current frequency changer direct current bus is normal and the underfill of supercapacitor group is electric, first switch is controlled
Pipe shutdown, makes first switch tube anti-paralleled diode be connected into circuit；
According to the voltage signal of supercapacitor group and two-way DC DC topological circuit inductance current signal by preset
Second modulating wave generates model and generates the second modulating wave Um2, preset second modulating wave generation model are as follows:
Iref=KVp2*(Usc-Uf_sc)+KVi2*∑(Usc-Uf_sc)；
Um2=KIp2*(Iref-If_L)+KIi2*∑(Iref-If_L)；
Wherein, KVp2For preset Voltage loop proportionality coefficient, KVi2For preset Voltage loop integral coefficient, UscIt is pre- for full voltage
If value, Uf_scFor the voltage signal for sampling obtained supercapacitor group, IrefFor given value of current, If_LTo sample obtained inductance
Current signal, KIp2For preset electric current loop proportionality coefficient, KIi2For preset electric current loop integral coefficient.
Temporarily drop voltage threshold is set as guaranteeing frequency converter bus when motor operates normally in one of the embodiments,
Minimum voltage and frequency converter bus voltage rating median.
Full voltage preset value is set as the voltage rating of supercapacitor group both end voltage in one of the embodiments,.
It can be found that above scheme, which temporarily drops compensation device and is suitable for supporting direct current to supply containing DC bus
The frequency converter of electricity, its advantage is that without changing its ac power supply circuit, while can by control the first switch tube and this
Two switching tubes turn on and off, and make frequency changer direct current bus voltage when normal, super to this by frequency changer direct current bus
The charging of capacitor group, makes frequency changer direct current bus voltage when falling, and the supercapacitor group is by same set of circuit to frequency conversion
The electric discharge of device DC bus, enables energy two-way flow, does not need additional charging equipment, reduces voltage dip compensation dress
The volume set, reduces costs.
Further, above scheme, which temporarily drops compensation device can be directly from the frequency changer direct current bus side
It compensates, it is only necessary to acquire the voltage of the frequency changer direct current bus side and the supercapacitor group both ends, sampled data is few, number
It is simple according to analysis, while sampling window can be smaller, can be realized reaction speed faster, dynamic effect it is more preferable.
Further, above scheme, which temporarily drops compensation device can be by the supercapacitor group as storage
Energy unit, the energy density of the supercapacitor group is big, and energy storage is high, can substantially reduce the volume of energy-storage units；Also, this is super
Grade capacitor group charge/discharge speed is fast, can be realized faster and better reply DC voltage and temporarily drops problem.
Further, above scheme, the DC voltage temporarily drop compensation device due to the presence of booster circuit, compared to existing
DC voltage compensation device temporarily drops, the voltage of the supercapacitor group can be even lower down, when discharging identical energy,
The capacitance of the supercapacitor group wants small.
Further, compensation method control first switch tube can temporarily drop in above scheme, the controller using above-mentioned direct current
It is super to this by frequency changer direct current bus when keeping frequency changer direct current bus voltage normal with turning on and off for second switch
Grade capacitor group charging, when making frequency changer direct current bus Voltage Drop, the supercapacitor group is by same set of circuit to frequency conversion
The electric discharge of device DC bus, enables energy two-way flow, does not need additional charging equipment, further reduce DC voltage
The temporarily volume and cost of drop compensation device, can be realized DC voltage temporarily drop compensation device structure is simple, small in size and cost
It is low.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of existing voltage sag compensation device；
Fig. 2 is the structural schematic diagram that one embodiment of compensation device temporarily drops in DC voltage of the present invention；
Fig. 3 is the structural schematic diagram of one embodiment of controller of the present invention；
Fig. 4 is the flow diagram that one embodiment of compensation method temporarily drops in DC voltage of the present invention；
Fig. 5 is that the frequency changer direct current bus voltage status and supercapacitor group voltage are monitored in one embodiment of the invention
The flow diagram of the step of state；
Fig. 6 is the flow diagram that another embodiment of compensation method temporarily drops in DC voltage of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is described in further detail.It is emphasized that following implement
Example is merely to illustrate the present invention, but is not defined to the scope of the present invention.Likewise, following embodiment is only portion of the invention
Point embodiment and not all embodiments, institute obtained by those of ordinary skill in the art without making creative efforts
There are other embodiments, shall fall within the protection scope of the present invention.
The present invention provides a kind of DC voltage and temporarily drops compensation device, can be realized the structure that compensation device temporarily drops in DC voltage
Simply, small in size and at low cost.
Fig. 2 is referred to, Fig. 2 is the structural schematic diagram that one embodiment of compensation device temporarily drops in DC voltage of the present invention.Such as Fig. 2 institute
Show, which temporarily drops compensation device 20 and include: first switch tube 27, first switch tube anti-paralleled diode 28, second open
Close pipe 29, second switch anti-paralleled diode 210, inductance 211, supercapacitor group 212 and controller 213.First switch
Pipe 27 is connected in parallel with first switch tube anti-paralleled diode 28, second switch 29 and second switch anti-paralleled diode
210 are connected in parallel, and the circuit that supercapacitor group 212, inductance 211 and first switch tube 27 are followed in series to form is whole as one
Body and second switch 29 are connected in series, and are subsequently used for connecing at 22 DC bus both ends of frequency converter；Inductance 211, first switch tube
27, first switch tube anti-paralleled diode 28, second switch 29 and second switch anti-paralleled diode 210 form two-way
DC/DC topological circuit carries out charge and discharge, and the first input end of controller 213 is separately connected the both ends of supercapacitor group 212, controls
Second input terminal of device 213 processed is used to be separately connected the both ends of 22 DC bus of frequency converter, and the output end of controller 213 connects respectively
First switch tube 27 and second switch 29 are connect, for according to 22 DC bus-bar voltage of frequency converter and 212 liang of supercapacitor group
The on off operating mode of voltage the control first switch tube 27 and second switch 29 at end.
Wherein, the application scenarios of compensation device 20, frequency converter 22 are temporarily dropped as DC voltage provided in an embodiment of the present invention
Including rectifier 23, dc-link capacitance 24 and inverter 25.
The rectifier 23 be used for the AC power source 21 be connected in series, the rectifier 23 also with 25 company of series connection of inverter
It connects, which is connected with the DC bus both ends of the frequency converter 22, and the inverter 25 and the rectifier 23 are somebody's turn to do
Motor 26 is connected in series connection respectively.
DC voltage is temporarily dropped for compensation device, supercapacitor group 212 therein is used as energy-storage units, the inductance
211, the first switch tube 27 and its anti-paralleled diode 28 and the second switch 29 and its 210 groups of anti-paralleled diode it is in pairs
To DC DC topological circuit carry out charge and discharge, can be realized energy in bidirectional flow.Controller 213 is according to the direct current of the frequency converter 22
The voltage of bus capacitor 24 and the voltage at 212 both ends of supercapacitor group control the first of the two-way DC/DC topological circuit and open
Close the on off operating mode of pipe 27 and second switch 29.
When the Voltage Drop of frequency changer direct current bus, the second switch 29 shutdown, the second switch inverse parallel two
Pole pipe 210 connects in circuit, which samples the voltage signal U of the frequency changer direct current busf_dcWith the super capacitor
The voltage signal U at 212 both ends of device groupf_sc, and according to the voltage signal U of the frequency changer direct current bus of acquisitionf_dcWith the electric current of inductance
Signal If_LModel, which is generated, by preset first modulating wave generates the first modulating wave Um1, preset first modulating wave generation model are as follows:
Iref=KVp1*(Udc-Uf_dc)+KVi1*∑(Udc-Uf_dc)；
Um1=KIp1*(Iref-If_L)+KIi1*∑(Iref-If_L)；
Wherein, KVp1For preset Voltage loop proportionality coefficient, KVi1For preset Voltage loop proportionality coefficient, UdcTemporarily to drop voltage
Threshold value, Uf_dcFor the dc-link capacitance voltage that the sampling obtains, IrefFor given value of current, If_LThe inductance obtained for the sampling
211 electric currents, KIp1For preset electric current loop proportionality coefficient, KIi1For preset electric current loop proportionality coefficient.
The controller 213 can generate the first driving signal according to the modulating wave and preset triangular wave, control this first
Switching tube 27 turns on and off, at this time the inductance, the first switch tube 27 and its anti-paralleled diode 28 and the second switch
Pipe anti-paralleled diode 210 forms booster circuit, which is 22 inverter side of frequency converter power supply, prevents this electronic
26 supply voltage of machine falls.
When the voltage of frequency changer direct current bus is normal, and when the 212 underfill electricity of supercapacitor group, controller 213 can
To control the first switch tube 27 shutdown, connect the first switch tube anti-paralleled diode 28 in circuit, controller 213 is adopted
The voltage of sample 22 DC bus-bar voltage of frequency converter and 212 both ends of supercapacitor group, and according to the electric signal of acquisition by pre-
If the second modulating wave generate model generate the second modulating wave Um2, preset second modulating wave generation model are as follows:
Iref=KVp2*(Usc-Uf_sc)+KVi2*∑(Usc-Uf_sc)；
Um2=KIp2*(Iref-If_L)+KIi2*∑(Iref-If_L)；
Wherein, KVp2For preset Voltage loop proportionality coefficient, KVi2For preset Voltage loop integral coefficient, UscIt is super to preset
Capacitor bank voltage value, Uf_scFor the voltage for the supercapacitor group 212 that the sampling obtains, IrefFor given value of current, If_LFor this
Sample obtained 211 electric current of inductance, KIp2For preset electric current loop proportionality coefficient, KIi2For preset electric current loop integral coefficient.
Then the controller 213 can generate the second driving signal according to the second modulating wave and preset triangular wave, and defeated
The second driving signal is to second switch 29 out, to control turning on and off for the second switch 29, at this time the inductance 211,
The first switch tube anti-paralleled diode 28 and the second switch 29 and its anti-paralleled diode 210 form reduction voltage circuit, should
Frequency converter 22 is the supercapacitor group 212 charging.
When the voltage of frequency changer direct current bus is normal, and the supercapacitor group 212 is fully charged, controller 213 is controlled
The first switch tube 27 and the second switch 29 are turned off, and the voltage of the supercapacitor group 212 is less than the frequency converter 22
DC bus-bar voltage, the motor 26 are only powered by AC power source for it.
In the present embodiment, the first switch tube 27 can for such as insulated gate bipolar transistor (IGBT,
Insulated Gate Bipolar Transistor) or Metal-Oxide Semiconductor field effect transistor (MOSFET,
Metal-Oxide-Semiconductor Field-Effect Transistor) constant power transistor, the present invention do not limited
It is fixed.
In the present embodiment, second switch 29 can be such as insulated gate bipolar transistor (IGBT, Insulated
Gate Bipolar Transistor) or Metal-Oxide Semiconductor field effect transistor (MOSFET, Metal-Oxide-
Semiconductor Field-Effect Transistor) constant power transistor.
Optionally, which temporarily drops the controller 213 in compensation device, can be also used for: sampling the frequency converter 25
The sampled data is simultaneously sent into single-chip microcontroller by DC bus-bar voltage and the voltage at 212 both ends of supercapacitor group, and analysis should
Sampled data, by the voltage signal of 25 DC bus of frequency converter and temporarily, drop voltage threshold is compared, by super capacitor respectively
The voltage signal at 212 both ends of device group obtains comparison result compared with full voltage preset value, and is worked as according to comparison result judgement
The voltage ratings of preceding frequency changer direct current bus.
Optionally, this temporarily drops voltage threshold, can be 25 bus of frequency converter guaranteed when the motor 26 operates normally
Minimum voltage and the 25 bus voltage rating of frequency converter median etc..About the size of the temporary drop voltage threshold, the present invention
It is not limited.
Optionally, the full voltage preset value can be the voltage rating of 212 both end voltage of supercapacitor group.About
The size of the full voltage preset value, the present invention are not limited.
Optionally, the controller 213, can be specifically used for: sampling the voltage signal of 25 DC bus of frequency converter and be somebody's turn to do
The voltage signal at 212 both ends of supercapacitor group, and it is corresponding with the temporary drop voltage threshold and the full voltage preset value respectively compared with,
It is higher than 212 liang of the temporary drop voltage threshold and the supercapacitor group in the voltage signal for comparing 25 DC bus of frequency converter
When the voltage signal at end is lower than the full voltage preset value, then judge that the voltage of current frequency changer direct current bus is normal and judges to be somebody's turn to do
Supercapacitor group 212 underfill electricity.
Optionally, which can be also used for comparing 25 DC bus-bar voltage of frequency converter higher than the temporary drop
When voltage threshold and the voltage at 212 both ends of supercapacitor group are not less than the full voltage preset value, then current frequency conversion is judged
The voltage of device DC bus is normal and judges that the supercapacitor group 212 is fully charged.
Optionally, which can also be specifically used for comparing 25 DC bus-bar voltage of frequency converter lower than this
Temporarily when drop voltage threshold, then judges the Voltage Drop of current frequency changer direct current bus and judge that the supercapacitor group 212 is
The inverter side of the frequency converter 25 is powered.
The present invention also provides a kind of controller, can be realized can be by controlling 28 He of first switch tube anti-paralleled diode
Second switch anti-paralleled diode 210 turns on and off, when the voltage of frequency changer direct current bus is normal, frequency converter direct current
Bus is the charging of supercapacitor group, and in the Voltage Drop of frequency changer direct current bus, supercapacitor group can be by same
Set circuit discharges, and enables energy two-way flow, does not need additional charging equipment, further reduce DC voltage
The temporarily volume and cost of drop compensation device, can be realized DC voltage temporarily drop compensation device structure is simple, small in size and cost
It is low.
Fig. 3 is referred to, Fig. 3 is the structural schematic diagram of one embodiment of controller of the present invention.In the present embodiment, the controller 30
For the controller in above-described embodiment, which includes signal acquisition module 31, computer equipment 32, driving signal generation
Module 33.
The signal acquisition module 31, for sampling the voltage and the supercapacitor group 212 of 25 DC bus of frequency converter
Voltage, sample the two-way DC DC topological circuit 211 electric current of inductance.
The computer equipment 32, for the frequency changer direct current bus voltage status and supercapacitor group shape according to monitoring
The voltage signal of state, the voltage signal of frequency changer direct current bus and the supercapacitor group 212 judges frequency changer direct current bus electricity
212 voltage status of pressure condition and supercapacitor group, thus determine that the working condition of compensation device 20 temporarily drops in the DC voltage, and
Generate first modulating wave or the second modulating wave.
The driving signal generation module 33, for generating first according to the first modulating wave of the generation and preset triangular wave
Driving signal, and turning on and off for the first switch tube 27 is controlled, or, according to the second modulating wave of the generation and preset three
Angle wave generates the second driving signal, and controls turning on and off for the second switch 29.
Optionally, the computer equipment 32 may include memory, processor and be stored on the memory and can be at this
The instruction run on processor, the processor execute the function that the controller is able to achieve when the instruction.
The present invention also provides a kind of DC voltages temporarily to drop compensation method, can be realized the knot that compensation device temporarily drops in DC voltage
Structure is simple, small in size and at low cost.
Fig. 4 is referred to, Fig. 4 is the flow diagram that one embodiment of compensation method temporarily drops in DC voltage of the present invention.It should be noted
If having substantially the same as a result, method of the invention is not limited with process sequence shown in Fig. 4.As shown in figure 4,
This method comprises the following steps:
S401: the voltage signal of sampling frequency converter DC bus and the voltage signal at supercapacitor group both ends, sampling are double
To DC DC topological circuit inductance current signal.
S402: straight according to the frequency changer direct current bus voltage status of monitoring and supercapacitor group voltage status, frequency converter
Flow the voltage signal of bus, the voltage signal of supercapacitor group and two-way DC DC topological circuit inductance current signal, it is raw
At the first modulating wave or the second modulating wave.
S403: the first driving signal is generated according to the first modulating wave and preset triangular wave, and uses the first driving signal
Control first switch tube turns on and off, or, the second driving signal is generated according to the second modulating wave and preset triangular wave, and
Using turning on and off for the second driving signal control second switch.
In one of the embodiments, as shown in figure 5, monitoring frequency changer direct current bus voltage status and supercapacitor group
The step of voltage status may include:
S4021: the voltage signal of frequency changer direct current bus is compared with temporary drop voltage threshold；
S4022: the voltage signal of supercapacitor group and full voltage preset value are compared；
S4023: according to comparison result, judge frequency changer direct current bus voltage status and supercapacitor group voltage status.
Specifically, according to the electricity of the voltage signal of 22 DC bus of frequency converter of sampling and the supercapacitor group 212
Signal is pressed, by the voltage signal of the voltage signal of 22 DC bus of frequency converter of sampling and the supercapacitor group 212, respectively
Comparison result is obtained compared with corresponding with temporarily drop voltage threshold and full voltage preset value, the comparison result obtained according to this judges to become
212 voltage status of frequency device DC bus-bar voltage state and supercapacitor group, to determine that compensation device temporarily drops in the DC voltage
20 working condition.
In one of the embodiments, as shown in fig. 6, according to comparison result, frequency changer direct current bus voltage status is judged
Include: with the step of supercapacitor group voltage status
S40231: if the voltage of frequency changer direct current bus determines currently lower than temporarily drop voltage threshold than frequency converter direct current
The Voltage Drop of bus.
By the voltage of 22 DC bus of frequency converter of sampling and the voltage signal of the supercapacitor group 212 respectively with this
The temporary drop voltage threshold of the DC bus-bar voltage of frequency converter 22 and the full voltage preset value of 212 both end voltage of supercapacitor group
Compare to obtain comparison result, is 22 DC bus-bar voltage of frequency converter lower than the temporary drop voltage threshold in the obtained comparison result
When, determine the Voltage Drop of current frequency changer direct current bus and the supercapacitor group 212 is the inverter side of the frequency converter 22
Power supply.
In one of the embodiments, as shown in fig. 6, according to comparison result, frequency changer direct current bus voltage status is judged
Include: with the step of supercapacitor group voltage status
S40233: if the voltage of frequency changer direct current bus is higher than temporarily drop voltage threshold and the electricity at supercapacitor group both ends
It presses signal to be lower than full voltage preset value, then determines that the voltage of current frequency changer direct current bus is normal and supercapacitor group is not filled
Full electricity.
It samples the voltage signal of 22 DC bus of frequency converter and the voltage signal of the supercapacitor group 212 and this is two-way
DC DC topological circuit inductive current, then respectively by the voltage signal of 22 DC bus of frequency converter and the supercapacitor group
It is 22 direct current of frequency converter in comparison result compared with 212 voltage signal is corresponding with temporarily drop voltage threshold and full voltage preset value
The voltage signal of bus is higher than the temporary drop voltage threshold and the voltage signal at 212 both ends of supercapacitor group is full electric lower than this
When pressing preset value, therefore, it is determined that the voltage of current frequency changer direct current bus is normal and 212 underfill of supercapacitor group is electric.
In one of the embodiments, as shown in fig. 6, according to comparison result, frequency changer direct current bus voltage status is judged
Include: with the step of supercapacitor group state
S40232: if the voltage of frequency changer direct current bus is higher than temporarily drop voltage threshold and the electricity at supercapacitor group both ends
Pressure is not less than full voltage preset value, then determines that the voltage of current frequency changer direct current bus is normal and supercapacitor group is full of
Electricity.
By the voltage of 22 DC bus of frequency converter of sampling and the voltage of the supercapacitor group 212 and according to sampling
The two-way DC DC topological circuit inductive current respectively with the temporary drop voltage threshold of the DC bus-bar voltage of the frequency converter 22 and should
The full voltage preset value of 212 both end voltage of supercapacitor group relatively obtains comparison result, is this in the obtained comparison result
22 DC bus-bar voltage of frequency converter is higher than the temporary drop voltage threshold and the voltage at 212 both ends of supercapacitor group is not less than this
When full voltage preset value, determine that the voltage of current frequency changer direct current bus is normal and the supercapacitor group 212 is fully charged.
In one of the embodiments, as shown in fig. 6, this is according to frequency changer direct current bus voltage status and supercapacitor
Group voltage status, the voltage signal of frequency changer direct current bus, the voltage signal of supercapacitor group and two-way DC DC topological circuit
Inductance current signal, generate the first modulating wave the step of, may include:
S4024: if the Voltage Drop of current frequency changer direct current bus, second switch shutdown is controlled, second switch is made
Pipe anti-paralleled diode is connected into circuit；
S4025: according to the voltage signal U of frequency changer direct current busf_dcWith two-way DC DC topological circuit inductance electric current
Signal If_LModel, which is generated, by preset first modulating wave generates the first modulating wave Um1, preset first modulating wave generation model are as follows:
Iref=KVp1*(Udc-Uf_dc)+KVi2*∑(Udc-Uf_dc)；
Um1=KIp1*(Iref-If_L)+KIi1*∑(Iref-If_L)；
Wherein, KVp1For preset Voltage loop proportionality coefficient, KVi1For preset Voltage loop integral coefficient, UdcTo preset bus
Capacitance voltage value, Uf_dcFor the voltage for sampling obtained frequency changer direct current bus, IrefFor given value of current, If_LSampling obtains
Inductive current, KIp1For preset electric current loop proportionality coefficient, KIi1For preset electric current loop integral coefficient.
After generating the first modulating wave, further comprise the steps of:
S4208: the first driving signal is generated according to the first modulating wave and preset triangular wave, and uses the first driving signal
Control first switch tube turns on and off.
Wherein, this, which temporarily drops voltage threshold setting, to be 22 bus of frequency converter when guaranteeing that the motor 26 operates normally
Minimum voltage and the 22 bus voltage rating of frequency converter median.
Wherein, which can be set to the voltage rating of 212 both end voltage of supercapacitor group.
Wherein, as shown in fig. 6, according to frequency changer direct current bus voltage status and supercapacitor group voltage status, super
The voltage signal of capacitor group and two-way DC DC topological circuit inductance current signal, generate the second modulating wave Um2It can wrap
It includes:
S4026: it if the voltage of current frequency changer direct current bus is normal and supercapacitor group underfill electricity, controls
First switch tube shutdown, makes first switch tube anti-paralleled diode be connected into circuit；
S4027: according to the voltage signal U at supercapacitor group both endsf_scWith two-way DC DC topological circuit inductance electricity
Flow signal If_LModel, which is generated, by preset second modulating wave generates the second modulating wave Um2, preset second modulating wave generation model
Are as follows:
Iref=KVp2*(Usc-Uf_sc)+KVi2*∑(Usc-Uf_sc)；
Um2=KIp2*(Iref-If_L)+KIi2*∑(Iref-If_L)；
Wherein, KVp2For preset Voltage loop proportionality coefficient, KVi2For preset Voltage loop integral coefficient, UscIt is pre- for full voltage
If value, Uf_scFor the voltage signal for sampling obtained supercapacitor group, IrefFor given value of current, If_LTo sample obtained inductance
Current signal, KIp2For preset electric current loop proportionality coefficient, KIi2For preset electric current loop integral coefficient.
After generating the second modulating wave, further comprise the steps of:
S4029: the second driving signal is generated according to the second modulating wave and preset triangular wave, and uses the second driving signal
Control second switch turns on and off.
In addition, voltage is U before discharging if setting the capacitor of the supercapacitor group 212 as C1, electricity after the Δ t time is discharged
Pressure is U2If 26 input power of motor is P, then there is (1) formula:
In the present embodiment, to prevent ovennodulation, the voltage at i.e. 212 both ends of supercapacitor group of usual energy-storage units is wanted
Guarantee the output voltage for being greater than the inverter 22, cause energy-storage units i.e. 212 voltage change range of supercapacitor group relatively narrow,
Identical energy is exported, capacitor's capacity must be larger known to above-mentioned (1) formula, causes energy-storage units volume larger.In this reality
It applies in example, since when the supercapacitor group 212 is load supplying, circuit works in boost pressure-increasning state, the super capacitor
The voltage at 212 both ends of device group can be fallen too low down, i.e. the voltage conversion range at 212 both ends of supercapacitor group is wider,
Identical energy is exported, the capacitor's capacity known to above-mentioned (1) formula can be smaller, so that the energy-storage units i.e. supercapacitor
212 small volumes of group, greatly reduce energy storage cost.
It can be found that above scheme, which temporarily drops compensation device and is suitable for supporting direct current to supply containing DC bus
The frequency converter of electricity, its advantage is that without changing its ac power supply circuit, while can by control the first switch tube and this
Two switching tubes turn on and off, and make frequency changer direct current bus voltage when normal, super to this by frequency changer direct current bus
The charging of capacitor group, makes frequency changer direct current bus voltage when falling, and the supercapacitor group is by same set of circuit to frequency conversion
The electric discharge of device DC bus, enables energy two-way flow, does not need additional charging equipment, reduces voltage dip compensation dress
The volume set, reduces costs.
Further, above scheme, which temporarily drops compensation device can be directly from the frequency changer direct current bus side
It compensates, it is only necessary to acquire the voltage of the frequency changer direct current bus side and the supercapacitor group both ends, sampled data is few, number
It is simple according to analysis, while sampling window can be smaller, can be realized reaction speed faster, dynamic effect it is more preferable.
Further, above scheme, the DC voltage temporarily drop compensation device due to the presence of booster circuit, compared to existing
DC voltage compensation device temporarily drops, the voltage of the supercapacitor group can be even lower down, when discharging identical energy,
The capacitance of the supercapacitor group wants small.
Further, above scheme, the controller can by control first switch tube and second switch open and
Shutdown when keeping frequency changer direct current bus voltage normal, is charged to the supercapacitor group by frequency changer direct current bus, makes frequency conversion
When device DC bus-bar voltage falls, which is discharged by same set of circuit to frequency changer direct current bus, is made it possible to
Amount can two-way flow, do not need additional charging equipment, further reduce DC voltage temporarily drop compensation device volume and
Cost, can be realized DC voltage temporarily drop compensation device structure it is simple, small in size and at low cost.
It should be understood by those ordinary skilled in the art that: the discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under thinking of the invention, above embodiments
Or can also be combined between the technical characteristic in different embodiments, step can be realized with random order, and be existed such as
Many other variations of the upper different aspect of the invention, for simplicity, they are not provided in details.
In addition, to simplify explanation and discussing, and in order not to obscure the invention, it can in provided attached drawing
It is connect with showing or can not show with the well known power ground of integrated circuit (IC) chip and other components.Furthermore, it is possible to
Device is shown in block diagram form, to avoid obscuring the invention, and this has also contemplated following facts, i.e., about this
The details of the embodiment of a little block diagram arrangements be height depend on will implementing platform of the invention (that is, these details should
It is completely within the scope of the understanding of those skilled in the art).Elaborating that detail (for example, circuit) is of the invention to describe
In the case where exemplary embodiment, it will be apparent to those skilled in the art that can be in these no details
In the case where or implement the present invention in the case that these details change.Therefore, these descriptions should be considered as explanation
Property rather than it is restrictive.
Although having been incorporated with specific embodiments of the present invention, invention has been described, according to retouching for front
It states, many replacements of these embodiments, modifications and variations will be apparent for those of ordinary skills.Example
Such as, discussed embodiment can be used in other memory architectures (for example, dynamic ram (DRAM)).
The embodiment of the present invention be intended to cover fall into all such replacements within the broad range of appended claims,
Modifications and variations.Therefore, all within the spirits and principles of the present invention, any omission, modification, equivalent replacement, the improvement made
Deng should all be included in the protection scope of the present invention.
Claims (10)
1. compensation device temporarily drops in a kind of DC voltage characterized by comprising
First switch tube, first switch tube anti-paralleled diode, second switch, second switch anti-paralleled diode, inductance,
Supercapacitor group and controller；
The first switch tube is connected in parallel with the first switch tube anti-paralleled diode, the second switch and described the
Two switching tube anti-paralleled diodes are connected in parallel, and the supercapacitor group, the inductance and the first switch tube are successively gone here and there
Join the circuit constituted to be connected in series with the second switch as a whole, is subsequently used for connecing in frequency changer direct current bus two
End；
The inductance, the first switch tube, the first switch tube anti-paralleled diode, the second switch and described
Two switching tube anti-paralleled diodes form two-way DC/DC topological circuit and carry out charge and discharge, and the first input end of the controller connects
Enter the voltage signal of the supercapacitor group, the second input terminal of the controller is for accessing the frequency changer direct current bus
Voltage signal, the output end of the controller is separately connected the first switch tube and the second switch, is used for basis
The frequency changer direct current bus voltage signal and the voltage signal at supercapacitor group both ends control the first switch tube
With the on off operating mode of the second switch.
2. compensation method temporarily drops in a kind of DC voltage characterized by comprising
The voltage signal of sampling frequency converter DC bus and the voltage signal at supercapacitor group both ends, sample two-way DC DC open up
Flutter the current signal of the inductance of circuit；
According to the frequency changer direct current bus voltage status of monitoring and supercapacitor group voltage status, the frequency changer direct current bus
Voltage signal, the supercapacitor group voltage signal and the two-way DC DC topological circuit inductance current signal,
Generate the first modulating wave or the second modulating wave；
The first driving signal is generated according to first modulating wave and preset triangular wave, and uses the first driving signal control
First switch tube processed turns on and off, or, the second driving signal is generated according to second modulating wave and preset triangular wave,
And turning on and off using second driving signal control second switch.
3. compensation method temporarily drops in DC voltage as claimed in claim 2, which is characterized in that monitor the frequency changer direct current bus
The step of voltage status and supercapacitor group voltage status includes:
The voltage signal of the frequency changer direct current bus is compared with temporary drop voltage threshold；
The voltage signal of the supercapacitor group and full voltage preset value are compared；
According to comparison result, frequency changer direct current bus voltage status and supercapacitor group voltage status are judged.
4. compensation method temporarily drops in DC voltage as claimed in claim 3, which is characterized in that described according to comparison result, judgement
The step of frequency changer direct current bus voltage status and supercapacitor group voltage status includes:
If the voltage of the frequency changer direct current bus is higher than the temporary drop voltage threshold and supercapacitor group both ends
Voltage is lower than the full voltage preset value, then determines that the voltage of current frequency changer direct current bus is normal and the supercapacitor
Group underfill electricity.
5. compensation method temporarily drops in DC voltage according to claim 3, which is characterized in that it is described according to comparison result, sentence
The step of disconnected frequency changer direct current bus voltage status and supercapacitor group voltage status includes:
If the voltage of the frequency changer direct current bus is higher than the temporary drop voltage threshold and supercapacitor group both ends
Voltage is not less than the full voltage preset value, then determines that the voltage of current frequency changer direct current bus is normal and the super capacitor
Device group is fully charged.
6. compensation method temporarily drops in DC voltage as claimed in claim 3, which is characterized in that described according to comparison result, judgement
The step of frequency changer direct current bus voltage status and supercapacitor group voltage status includes:
If the voltage of the frequency changer direct current bus is lower than the temporary drop voltage threshold, current frequency changer direct current bus is determined
Voltage Drop.
7. compensation method temporarily drops in DC voltage as claimed in claim 6, which is characterized in that described according to the frequency converter direct current
Bus state and supercapacitor group voltage status, the voltage signal of the frequency changer direct current bus and the two-way DC DC open up
The current signal of the inductance of circuit is flutterred, the first modulating wave is generated, comprising:
If the Voltage Drop of current frequency changer direct current bus, the second switch shutdown is controlled, the second switch is made
Anti-paralleled diode is connected into circuit；
According to the voltage signal of the frequency changer direct current bus and two-way DC DC topological circuit inductance current signal by default
The first modulating wave generate model generate the first modulating wave Um1, the preset first modulating wave generation model are as follows:
Iref=KVp1*(Udc-Uf_dc)+KVi1*∑(Udc-Uf_dc)；
Um1=KIp1*(Iref-If_L)+KIi1*∑(Iref-If_L)；
Wherein, KVp1For preset Voltage loop proportionality coefficient, KVi1For preset Voltage loop integral coefficient, UdcTemporarily to drop voltage threshold
Value, Uf_dcFor the voltage signal for sampling obtained frequency changer direct current bus, IrefFor given value of current, If_LIt is sampled to be described
The current signal of the inductance arrived, KIp1For preset electric current loop proportionality coefficient, KIi1For preset electric current loop integral coefficient.
8. compensation method temporarily drops in DC voltage as claimed in claim 4, which is characterized in that described according to the frequency converter direct current
Bus and supercapacitor group voltage status, the voltage signal of the supercapacitor group and the two-way DC DC topological circuit
Inductive current, generate the second modulating wave Um2, comprising:
If the voltage of current frequency changer direct current bus is normal and the supercapacitor group underfill electricity, described first is controlled
Switching tube shutdown, makes the first switch tube anti-paralleled diode be connected into circuit；
According to the voltage signal of the supercapacitor group and two-way DC DC topological circuit inductance current signal by preset
Second modulating wave generates model and generates the second modulating wave Um2, the preset second modulating wave generation model are as follows:
Iref=KVp2*(Usc-Uf_sc)+KVi2*∑(Usc-Uf_sc)；
Um2=KIp2*(Iref-If_L)+KIi2*∑(Iref-If_L)；
Wherein, KVp2For preset Voltage loop proportionality coefficient, KVi2For preset Voltage loop integral coefficient, UscIt is default for full voltage
Value, Uf_scFor the voltage signal for sampling obtained supercapacitor group, IrefFor given value of current, If_LIt is obtained for the sampling
Inductance current signal, KIp2For preset electric current loop proportionality coefficient, KIi2For preset electric current loop integral coefficient.
9. compensation method temporarily drops in the DC voltage as described in any one of claim 2-8, which is characterized in that the temporary drop voltage
Threshold value is set as guaranteeing that the minimum voltage of frequency converter bus when motor operates normally and the frequency converter bus are specified
The median of voltage.
10. compensation method temporarily drops in the DC voltage as described in any one of claim 2-8, which is characterized in that the full voltage
Preset value is set as the voltage rating of the supercapacitor group both end voltage.
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Application publication date: 20190607 |