CN106849331A - Uninterruptible power system and its power adjusting control circuit - Google Patents
Uninterruptible power system and its power adjusting control circuit Download PDFInfo
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- CN106849331A CN106849331A CN201710093884.3A CN201710093884A CN106849331A CN 106849331 A CN106849331 A CN 106849331A CN 201710093884 A CN201710093884 A CN 201710093884A CN 106849331 A CN106849331 A CN 106849331A
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- 230000033228 biological regulation Effects 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 17
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Abstract
A kind of power adjusting control circuit of uninterruptible power system, including：Frequency detection circuit, power-sensing circuit, mode switching circuit, and power conditioning circuitry, are connected with the frequency detection circuit, the power-sensing circuit and the mode switching circuit respectively；Output end of the power conditioning circuitry also with the uninterruptible power system is connected, to receive its output voltage value of feedback；The power conditioning circuitry is used to determine power regulating signals according to power output value of feedback, first frequency value of feedback, output voltage value of feedback, frequency set-point and output voltage set-point.The power adjusting control circuit of above-mentioned uninterruptible power system has preferably regulation real-time such that it is able to ensures the power output and workload demand power match of uninterruptible power system, meets the power demands of load.
Description
Technical field
The present invention relates to power supply technical field, more particularly to a kind of uninterruptible power system and its power adjusting control
Circuit processed.
Background technology
With the rapid growth of data center power sources load in recent years, energy efficiency indexes requirement more and more higher.For being applied to
The uninterruptible power system (UPS) of high-density data center, will not only power for information technoloy equipment, also ensure the sky of information technoloy equipment operation
The auxiliary equipments such as tune are powered, and power supply requirement can continue to increase.Because the densification of data center is a kind of inevitable trend, because
This proposes brand-new requirement to the UPS that electric power safeguard is provided for it.Traditional UPS when load changes, power output
Can not be adjusted in time, so as to cause power output to be mismatched with workload demand power, it is impossible to meet the electricity consumption need of user
Ask.
The content of the invention
Based on this, it is necessary to provide a kind of power adjusting control of preferable uninterruptible power system of power adjusting real-time
Circuit, also provides a kind of uninterruptible power system.
A kind of power adjusting control circuit of uninterruptible power system, including：Frequency detection circuit, for it is described not between
The frequency for powering off origin system output voltage is detected and exported as first frequency value of feedback；The frequency detection circuit is also used
Detected in the frequency to line voltage and exported as second frequency value of feedback；Power-sensing circuit, for it is described not
The power output of uninterruptible power system is detected and exported as power output value of feedback；Mode switching circuit, including first
Grid-connected contact, the first off-network contact, the second grid-connected contact and the second off-network contact；Examined with the frequency the first grid-connected contact
Slowdown monitoring circuit is connected, to receive the second frequency value of feedback；The first off-network contact is used to receive default given frequency value；Institute
The second grid-connected contact is stated for receiving line voltage value of feedback；The second off-network contact is used to receive default given magnitude of voltage；
The mode switching circuit is used for the input of the described first grid-connected contact under grid-connect mode as frequency set-point, by described in
The input of the second grid-connected contact is exported as output voltage set-point, and by the defeated of the first off-network contact under off-network pattern
Enter and exported as frequency set-point, using the input of the second off-network contact as output voltage set-point；And power adjusting
Circuit, is connected with the frequency detection circuit, the power-sensing circuit and the mode switching circuit respectively；The power is adjusted
Output end of the economize on electricity road also with the uninterruptible power system is connected, to receive its output voltage value of feedback；The power adjusting
Circuit is used for according to the power output value of feedback, the first frequency value of feedback, the output voltage value of feedback, the frequency
Set-point and the output voltage set-point determine power regulating signals.
The power adjusting control circuit of above-mentioned uninterruptible power system, mode switching circuit can be according to uninterrupted power source system
The mode of operation of system is switched over to the output voltage set-point and frequency set-point that export, so that power conditioning circuitry can
With frequency (namely first frequency value of feedback), output voltage value of feedback, output work according to uninterruptible power system output voltage
Rate value of feedback, frequency set-point and output voltage set-point determine power regulating signals, with preferable real-time, so as to
Enough ensure the power output and workload demand power match of uninterruptible power system, meet the power demands of load.
Wherein in one embodiment, the frequency detection circuit includes that first frequency detection unit and second frequency are detected
Unit；The first frequency detection unit is used to that the frequency of the uninterruptible power system output voltage detect and conduct
First frequency value of feedback is exported；The second frequency detection unit is used to detect and as second the frequency of line voltage
Frequency feedback value is exported.
Wherein in one embodiment, the first frequency detection unit includes the first phaselocked loop and the first converter unit；
First phaselocked loop is connected with the output end and first converter unit of the uninterruptible power system respectively；Described first
Phaselocked loop is used to detect the phase of the uninterruptible power system output voltage；First converter unit is used for according to input
Phse conversion obtains the first frequency value of feedback.
Wherein in one embodiment, the second frequency detection unit includes the second phaselocked loop and the second converter unit；
Second phaselocked loop is connected with power network and second converter unit respectively；Second phaselocked loop is used to detect line voltage
Phase；Second converter unit is used to obtain the second frequency value of feedback according to the phse conversion of input.
Wherein in one embodiment, the mode switching circuit includes the first switching switch, the second switching switch and controls
Unit processed；The fixing end of the first switching switch is connected with the power conditioning circuitry；The first of the first switching switch
Contact is the described first grid-connected contact；Second contact of the first switching switch is the first off-network contact；Described second
The fixing end for switching switch is connected with the power conditioning circuitry；First contact of the second switching switch is for described second simultaneously
Net contact；Second contact of the second switching switch is the second off-network contact；Described control unit is used for according to described
The mode of operation of uninterruptible power system switches over control to the described first switching switch and the described second switching switch.
Wherein in one embodiment, the power-sensing circuit is used for the active of uninterruptible power system output
Power and reactive power detect and active power of output value of feedback and reactive power value of feedback；The power conditioning circuitry bag
Include active adjustment unit and Reactive-power control unit；The first input end of the active adjustment unit connects with the frequency detection circuit
Connect, to receive the first frequency value of feedback；Second input of the active adjustment unit and the described first switching switch
Fixing end is connected, to receive the frequency set-point；3rd input of the active adjustment unit also with the power detection
Circuit is connected, to receive the active power feedback value；The active adjustment unit be used for according to the first frequency value of feedback,
The frequency set-point and the active power feedback value determine active power regulation signal；The first of the Reactive-power control unit
Input is connected with the output end of the uninterruptible power system, to receive the output voltage value of feedback；The Reactive-power control
Second input of unit is connected with the fixing end of the described second switching switch, to receive the output voltage set-point；It is described
3rd input of Reactive-power control unit is also connected with the power-sensing circuit, to receive the reactive power value of feedback；Institute
Reactive-power control unit is stated for being fed back according to the output voltage value of feedback, the output voltage set-point and the reactive power
Value determines reactive power Regulate signal.
Wherein in one embodiment, the active adjustment unit includes the frequency loop and active power ring that are sequentially connected；
The frequency loop includes the first adder and frequency ring controller that are sequentially connected；The first input end of the first adder is made
It is the first input end of the active adjustment unit；Second input of the first adder is used as the active adjustment unit
The second input；The first adder is used to ask for the difference between the frequency set-point and the first frequency value of feedback
It is worth and exports to the frequency ring controller；The frequency ring controller is active for carrying out closed-loop control generation to the difference
Power set-point；The active power ring includes the second adder and active ring controller that are sequentially connected；Second addition
The first input end of device as the active adjustment unit the 3rd input；Second input of the second adder and institute
State the connection of frequency ring controller；The second adder is used to ask for the active power set-point and the active power feedback
Difference between value is simultaneously exported to the active ring controller；The active ring controller is used to carry out closed loop to the difference being input into
Control generation active power regulation signal.
Wherein in one embodiment, the Reactive-power control unit includes the Voltage loop and the reactive power ring that are sequentially connected；
The Voltage loop includes the 3rd adder and the voltage ring controller that are sequentially connected；The first input end of the 3rd adder is made
It is the first input end of the Reactive-power control unit；Second input of the 3rd adder is used as the Reactive-power control unit
The second input；3rd adder is used to ask between the output voltage set-point and the output voltage value of feedback
Difference and export to the voltage ring controller；The voltage ring controller is used to carry out closed-loop control life to the difference being input into
Into reactive power set-point；The reactive power ring includes the 4th adder being sequentially connected and idle ring controller；Described
The first input end of four adders as the Reactive-power control unit the 3rd input；Second input of the 4th adder
End is connected with the voltage ring controller；4th adder is used to ask for the reactive power set-point and the idle work(
Difference between rate value of feedback is simultaneously exported to the idle ring controller；The idle ring controller is used to enter the difference being input into
Row closed-loop control generates reactive power Regulate signal.
Wherein in one embodiment, also including control signal generative circuit and drive circuit；The control signal generation
Circuit is connected with the power conditioning circuitry；The control signal generative circuit also with the output end of the uninterruptible power system
Connection, to receive its output current value of feedback；The control signal generative circuit is used for according to the power regulating signals and institute
State output current value of feedback generation control signal；The drive circuit is connected with the control signal generative circuit, for by institute
State after control signal is converted to drive signal and export to the uninterruptible power system.
A kind of uninterruptible power system, including：Energy storage device；Current transformer, is connected to the energy storage device and commonly connected
Between point；And the power adjusting control circuit as described in foregoing any embodiment；The power adjusting control circuit is used for defeated
Go out the power regulating signals to be controlled with the output to the current transformer to the current transformer, thus realize to it is described not between
Power off the control of power system output power.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the uninterruptible power system in an embodiment；
Fig. 2 is the circuit theory diagrams of the uninterruptible power system in an embodiment.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 is the circuit block diagram of the uninterruptible power system (hereinafter referred to as UPS) in an embodiment.The UPS includes energy storage
Device 110, current transformer 120 and power adjusting control circuit 200.
Energy storage device 110 is used to store electric energy and outwards discharges electric energy.Energy storage device 110 is connected with current transformer 120 and is followed by
Enter points of common connection PCC (hereinafter referred to as PCC points), and be connected with power network 10 and load 20 by PCC points.Current transformer 120 is used for
Output to uninterruptible power system is controlled, so as to meet the power demands of load.
Power adjusting control circuit 200 includes frequency detection circuit 210, power-sensing circuit 220, mode switching circuit
230 and power conditioning circuitry 240.Wherein, the output end respectively with current transformer 120 of frequency detection circuit 210, power network (namely PCC
The civil power side of point) connection.Frequency detection circuit 210 is used to detect the frequency of UPS (namely current transformer 120) output voltage
And feed back f as first frequencyinvOutput.Frequency detection circuit 210 is additionally operable to that the frequency of line voltage is carried out to detect and conduct
Second frequency value of feedback fgridOutput.
Power-sensing circuit 220 is connected with the output end of current transformer 120, is carried out for the power output to current transformer 120
Detect and power output value of feedback.Power-sensing circuit 220 can determine output work according to the output current of UPS and output voltage
Rate.
Mode switching circuit 230 includes the first grid-connected contact S1, the first off-network contact S2, the second grid-connected contact S3 and second
Off-network contact S4.Wherein, the first grid-connected contact S1 is connected with frequency detection circuit 210, to receive second frequency value of feedback fgrid。
First off-network contact S2 is then used to receive default given frequency value fREF.In the present embodiment, given frequency value f is presetREFFor
50Hz, namely f50Hz.In other examples, it is also possible to according to load need for electricity setting.Second grid-connected contact S3 and electricity
Net connection, to receive line voltage value of feedback Ugd.Second off-network contact S4 is used to receive default given magnitude of voltage UREF.In this reality
Apply in example, preset given magnitude of voltage UREFIt is 220V, namely U220V.In other examples, given magnitude of voltage U is presetREFCan
To be set as needed.Mode switching circuit 230 is used for when UPS is in grid-connect mode, by the first grid-connected contact S1's
Input as frequency set-point, and using the input of the second grid-connected contact S3 as exporting to power adjusting after output voltage set-point
Circuit 240.Mode switching circuit 230 gives the input of the first off-network contact S2 as frequency when UPS is in off-network pattern
Value, and using the input of the second off-network contact S4 as exporting to power conditioning circuitry 240 after output voltage set-point.
Power conditioning circuitry 240 respectively with frequency detection circuit 210, power-sensing circuit 220 and mode switching circuit 230
Connection.Output end of the power conditioning circuitry 240 also with current transformer 120 is connected, to receive its output voltage value of feedback Ud.Power is adjusted
Economize on electricity road 240 is used for according to power output value of feedback, first frequency value of feedback finv, output voltage value of feedback Ud, frequency set-point
Determine power regulating signals with output voltage set-point.Specifically, when UPS is in grid-connect mode, mode switching circuit 230 will
The input of the first grid-connected contact S1 as frequency set-point, and using the input of the second grid-connected contact S3 as output voltage set-point
After export to power conditioning circuitry 240.That is, now frequency set-point is second frequency value of feedback fgrid, namely line voltage
Frequency feedback value；Output voltage set-point is line voltage value of feedback Ugd.Determine that power adjusting is believed using frequency and voltage
Number, it can be ensured that power regulating signals can in time follow the change of load and change, so that power adjusting has
Preferable real-time.
In one embodiment, power adjusting control circuit 200 also includes control signal generative circuit 250 and drive circuit
260.Control signal generative circuit 250 is connected with power conditioning circuitry 240.Control signal generative circuit 250 also with current transformer 120
Output end connection, to receive its output current value of feedback.The output end of control signal generative circuit 250 and drive circuit 260
Control end connection.Control signal generative circuit 250 is used to be given birth to according to the output current value of feedback and the power regulating signals
Exported after into control signal to drive circuit 260.Drive circuit 260 is according to defeated after the corresponding drive signal of control signal generation
Go out to current transformer 120, so as to be controlled to the work in current transformer 120, and then realize to the power output of current transformer 120
Control so that UPS power outputs disclosure satisfy that loading demand.
The power adjusting control circuit of above-mentioned UPS, mode switching circuit 230 can be according to the mode of operation of UPS to output
Output voltage set-point and frequency set-point switch over so that power conditioning circuitry 240 can according to UPS export electricity
The frequency (namely first frequency value of feedback) of pressure, output voltage value of feedback, power output value of feedback, frequency set-point and output electricity
Set-point is pressed to determine power regulating signals, with preferable real-time such that it is able to which the power output and load for ensuring UPS are needed
Power match is sought, the power demands of load are met.
Fig. 2 is the circuit theory diagrams of the UPS in an embodiment.In the present embodiment, frequency detection circuit 210 includes first
Frequency detecting unit 212 and second frequency detection unit 214.First frequency detection unit 212 is used for the frequency to UPS output voltages
Rate is detected and as first frequency value of feedback finvOutput.Wherein, first frequency detection unit 212 includes the first phaselocked loop
2122 and first converter unit 2124.The input of the first phaselocked loop 2122 is connected with the output end of current transformer 120, the first lock phase
The output end of ring 2122 is connected with the input of the first converter unit 2124.First phaselocked loop 2122 is used to detect current transformer 120
The phase theta of output voltageinv.First converter unit 2124 is used for according to the phase thetainvConversion obtains corresponding first frequency feedback
Value finv.Second frequency detection unit 214 is used to detect and as second frequency value of feedback f the frequency of line voltagegrid
Output.Second frequency detection unit 214 includes the second phaselocked loop 2142 and the second converter unit 2144.Wherein, the second phaselocked loop
2142 input is connected to the grid side of PCC points, namely is connected with power network.The output end of the second phaselocked loop 2142 becomes with second
Change the input connection of unit 2144.The operation principle of second frequency detection unit 214 and the work of first frequency detection unit 212
Make principle identical.
In the present embodiment, power-sensing circuit 220 is used to detect the active power and reactive power of UPS outputs
And active power of output value of feedback P and reactive power value of feedback Q.Power-sensing circuit 220 includes the first three-phase static coordinate system
Rotated to two-phase to two-phase rotating coordinate system conversion module (an abc/dq conversion modules) the 222, second three-phase static coordinate system
Coordinate system transformation module (the 2nd abc/dq conversion modules) 224 and power calculation unit 226.Wherein, an abc/dq becomes mold changing
The input of block 222 is connected with the output end of current transformer 120, the three-phase current (i for receiving its outputA、iB、iC、).First
Abc/dq conversion modules 222 are used for the three-phase current (i that will be receivedA、iB、iC) be converted to d axles under two-phase rotating coordinate system
Electric current IdWith q shaft currents IqExported respectively by d axles output end and q axle output ends afterwards.2nd abc/dq conversion modules 224 it is defeated
Enter end to be connected with the output end of current transformer 120, the three-phase voltage (u for receiving its outputA、uB、uC) and by the three-phase voltage
(uA、uB、uC) be converted to d shaft voltages U under two-phase rotating coordinate systemdWith q shaft voltages UqExported by d axles output end and q axles afterwards
End exports respectively.Power calculation unit 226 respectively with an abc/dq conversion modules 222 and the 2nd abc/dq conversion modules 224
Connection.The d axles that power calculation unit 226 is exported according to an abc/dq conversion modules 222 and the 2nd abc/dq conversion modules 224
Voltage UdWith d shaft currents IdIt is calculated active power feedback value P.Power calculation unit 226 becomes mold changing always according to an abc/dq
Block 222 and the q shaft voltages U of the output of the 2nd abc/dq conversion modules 224qWith q shaft currents IqIt is calculated reactive power value of feedback Q.
Referring to Fig. 2, mode switching circuit 230 includes the first switching switch the 232, second switching switch 234 and control unit
(not shown).Wherein, the fixing end of the first switching switch 232 is connected with power conditioning circuitry 240.First switching switch 232
The first contact 1 as mode switching circuit 230 the first grid-connected contact S1, namely first switching switch 232 the first contact 1
Output end with second frequency detection unit 214 is connected, to receive the second frequency value of feedback f of its outputgird(namely power network electricity
The frequency feedback value of pressure).Second switches the second contact 2 of switch 232 as the first off-network contact of mode switching circuit 230
S2.That is, the second contact 2 of the first switching switch 232 is used to receive default given frequency value f50Hz.Second switching switch 234
Fixing end be connected with power conditioning circuitry 240.First contact 1 of the second switching switch 234 is used as mode switching circuit 230
Second grid-connected contact S3, namely be connected to receive its line voltage value of feedback U with power networkgd.The second of second switching switch 234 touches
Point 2 as mode switching circuit 230 the second off-network contact S4, namely it is used to receiving default given magnitude of voltage U220V.Control
Unit is used to switch over control to the first switching switch 232 and the second switching switch 234 according to the mode of operation of UPS.Specifically
Ground, control unit under grid-connect mode, connect its first contact 1 and control the second switching switch by the switching of control first switch 232
234 connect its first contact 1, so as to by second frequency value of feedback fgridAs frequency set-point and by line voltage value of feedback Ugd
As output voltage set-point.Control unit then controls the first switching to switch 232 under off-network pattern and connects its second contact 2 simultaneously
The switching of control second switch 234 connects its second contact 2, so that by default given frequency value f50HzAs frequency set-point and general
Default given magnitude of voltage U220VExported as output voltage set-point.
Power conditioning circuitry 240 includes active adjustment unit 242 and Reactive-power control unit 244.Wherein, active adjustment unit
242 first input end is used to be connected with the output end of the first frequency detection unit 212 of frequency detection circuit 210, to receive
First frequency value of feedback finv.Second input of active adjustment unit 242 is connected with the fixing end of the first switching switch 232, with
Receive the frequency set-point of the output of the first switching switch 232.3rd input of active adjustment unit 242 is also electric with power detection
The output end connection of the power calculation unit 226 in road 220, to receive active power feedback value P.Active adjustment unit 242 is used
According to first frequency value of feedback finv, frequency set-point and active power feedback value P determine active power regulation signal Id *。
In one embodiment, active adjustment unit 242 includes the frequency loop 310 and active power ring 320 that are sequentially connected.Frequently
Rate ring 310 includes the first adder 312 and frequency ring controller 314 that are sequentially connected.The first input end of first adder 312
(-) receives first frequency value of feedback f as the first input end of active adjustment unit 242inv.The second of first adder 312
Input (+) as active adjustment unit 242 the second input, receives frequency set-point.First adder 312 is used to ask for
Frequency set-point and first frequency value of feedback finvBetween difference and export to frequency ring controller 314.Frequency ring controller
The difference of 314 pairs of inputs carries out closed-loop control and generates active power set-point P*.Frequency ring controller 314 can be PI controls
Device.
Active power ring 320 includes the second adder 322 and active ring controller 324 that are sequentially connected.Second adder
322 first input end (-) receives active power feedback value P as the 3rd input of active adjustment unit 242.Second adds
Second input (+) of musical instruments used in a Buddhist or Taoist mass 322 is connected with the output end of frequency ring controller 314, and the active power for receiving its output gives
Value P*.Second adder 322 is used to ask for active power set-point P*And difference between active power feedback value P and export to
Active ring controller 324.Active ring controller 324 is used to carry out the difference closed-loop control generation active power regulation signal
Id *.Active ring controller 324 can be PI controllers.
The first input end of Reactive-power control circuit 244 is connected with the output end of UPS, to receive its output voltage value of feedback
Ud.Second input of Reactive-power control unit 244 is connected with the fixing end of the second switching switch 234, is opened with receiving the second switching
Close the output voltage set-point of 234 outputs.3rd input of Reactive-power control unit 244 also with power-sensing circuit 220 in
The output end connection of power calculation unit 226, to receive reactive power value of feedback Q.Reactive-power control unit 244 is used for according to output
Voltage feedback value Ud, output voltage set-point and reactive power value of feedback Q determine reactive power Regulate signal Iq *。
In one embodiment, Reactive-power control unit 244 includes the Voltage loop 330 and the inactivity ring 340 that are sequentially connected.Voltage
Ring 330 includes the 3rd adder 332 and the voltage ring controller 334 that are sequentially connected.The first input end of the 3rd adder 332
(-) receives output voltage value of feedback U as the first input end of Reactive-power control unit 244d.The second of 3rd adder 332 is defeated
Enter second input of the end (+) as Reactive-power control unit 244, receive output voltage set-point.3rd adder 332 is used to ask
Take output voltage set-point and output voltage value of feedback UdDifference and export to voltage ring controller 334.Voltage ring controller
The difference of 334 pairs of inputs carries out closed-loop control and generates reactive power set-point Q*.Voltage ring controller 334 can be PI controls
Device.
Reactive power ring 340 includes the 4th adder 342 and the idle ring controller 344 that are sequentially connected.4th adder
342 first input end (-) receives reactive power value of feedback Q as the 3rd input of Reactive-power control unit 244.4th adds
Second input (+) of musical instruments used in a Buddhist or Taoist mass 342 is connected with the output end of voltage ring controller 334, and the reactive power for receiving its output gives
Value Q*.4th adder 342 is used to ask for reactive power set-point Q*And difference between reactive power value of feedback Q and export to
Idle ring controller 344.Idle ring controller 344 is used to carry out the difference closed-loop control generation reactive power Regulate signal
Iq *.Idle ring controller 344 can be PI controllers.
Control signal generative circuit 250 includes active electric current loop 252 and reactive current ring 254.Wherein, watt current ring
252 include adder 2522 and electric current loop d axis controllers 2524.The first input end (-) of adder 2522 is used as watt current
The first input end of ring 252, to receive d shaft currents Id.Second input (+) of adder 2522 is used as watt current ring 252
The second input be connected with the output end of active ring controller 244, to receive active power regulation signal Id *.Adder 2522
For obtaining active power regulation signal Id *With d shaft currents IdBetween difference and export to electric current loop d axis controllers 2524.Electricity
Stream ring d axis controllers 2524 are used to carry out the difference closed-loop control so as to generate d axle control signals udo.Reactive current ring 254
Structure and operation principle it is similar with watt current ring 252, not repeat introduce.In one embodiment, control signal generation
Circuit 250 also includes two-phase rotating coordinate system to three-phase static coordinate system conversion module (dq/abc conversion modules) 256.dq/abc
Conversion module 256 is used for the d axle control signals u for exporting watt current ring 252 and reactive current ring 254doWith q axle control signals
uqoBe converted to three-phase control signal (Varef2、Vbref2、Vcref2、)。
The input of drive circuit 260 is connected with the output end of control signal generative circuit 250.Drive circuit 260 it is defeated
Go out end to be connected with current transformer 120.Drive circuit 260 is used for according to the three-phase control signal (V for receivingaref2、Vbref2、Vcref2、)
Exported to current transformer 120 after generating corresponding drive signal, to control current transformer 120 to be adjusted power output, meet negative
Lotus need for electricity.
The course of work with regard to power adjusting control circuit under different mode is described further separately below：
Under grid-connect mode, the first switching switch 232 connects the first contacts 1, so as to by second frequency value of feedback fgridMake
It is frequency set-point.Under grid-connect mode, first frequency value of feedback finv(namely frequency feedback value of the output voltage of UPS) connects
Nearly second frequency value of feedback fgrid(namely frequency feedback value of line voltage), therefore by the effect of frequency ring controller 314, frequency
The output valve very little of rate ring 310, active power set-point P*Very little, current transformer 120 not active power of output, energy consumption very little.
Under the pattern, current transformer 120 can according to circumstances carry out idle harmonic compensation to power network, improve the quality of power supply of PCC points.Together
When, the second switching switch 234 connects its first contact 1, so as to by line voltage value of feedback UgdAs output voltage set-point.This
When, the output voltage value of feedback U of UPSdEqual to line voltage value of feedback Ugd, Voltage loop 330 is output as zero, namely reactive power
Set-point Q*It is zero, so that the not output reactive power of current transformer 120.
Under off-network pattern, the first switching switch 232 connects the second contacts, so that by default given frequency value f50HzAs
Frequency set-point.That is, it is 50Hz that off-network pattern lower frequency set-point is constant.In load variations, the frequency of UPS output voltages
Namely first frequency value of feedback finvCan change accordingly.For example, when load is uprushed, the wattful power of the output of current transformer 120
Rate occurs vacancy, causes the frequency feedback value of current transformer 120 namely first frequency value of feedback finvDiminish.Therefore, frequency loop
310 frequency set-point and first frequency value of feedback finvBetween error become big, therefore by the effect of frequency ring controller 314,
Active power set-point P*Become big, the control increase active power output of current transformer 120 is final to cause having for the output of current transformer 120
Work(power is equal with workload demand power, meets load need for electricity.Conversely, when load dump, first frequency value of feedback finv
Become big, by the effect of frequency ring controller 314, active power set-point P*Diminish, control current transformer 120 reduces active power
Output, meets load need for electricity.In a word, the change of load consumption active power is embodied directly in the change of the frequency of output voltage
In change, the frequency feedback value compares with fixed 50Hz set-points, and by the regulation of frequency ring controller 314, final control
The active power of current transformer 120 meets load power demands.
Meanwhile, under off-network pattern, the second switching switch 234 connects its second contact, so that will default given magnitude of voltage
U220VAs output voltage set-point.That is, under off-network pattern, it is 220V that output voltage set-point is constant.In this mode, lead to
Cross the demand of the magnitude of voltage de-regulation reactive load changed power of the reality output of current transformer 120.Specifically, in the idle work(of load
When rate increases, the reactive power of the output of current transformer 120 equally occurs vacancy, so as to cause the output voltage of current transformer 120
Amplitude declines.The output voltage set-point U of Voltage loop 330220VWith output voltage value of feedback UdBetween error become big, therefore pass through
The adjustment effect of voltage ring controller 334, reactive power set-point Q*Become big, the control increase reactive power output of current transformer 120,
The final reactive power for causing the output of current transformer 120 is equal with workload demand power, and then quick maintenance current transformer 120 exports electricity
The stabilization of pressure amplitude value, the demand that the full load quality of power supply high is powered, on the contrary situation is as the same.
Circuit is controlled by above-mentioned power adjusting, the quick output to current transformer 120 can be adjusted in load variations
Section, with preferable real-time, disclosure satisfy that load need for electricity.Above-mentioned power adjusting control circuit is also applied for many UPS
In combining system.When load is active and during reactive power changes in demand, the frequency and amplitude of many UPS outputs all can synchronously occur
Change, therefore each UPS can be by the control action of frequency adjusting control circuit 200, quick average mark distribution transforming stream device 120
The active power and reactive power size of output, finally cause active and reactive power and workload demand that many current transformers are exported
Power is equal, and then quickly maintains the stabilization of current transformer output voltage amplitude, the demand that the full load quality of power supply high is powered.This
Kind of power regulating method compared to traditional by interconnection line and the ups power system of machine, real-time, power-sharing and
Reliability aspect, with extraordinary effect.
Above-mentioned UPS can realize grid-connect mode to the seamless switching of off-network pattern.When current transformer 120 is in grid-connect mode,
Frequency loop 310 and Voltage loop 330 do not work substantially, and current transformer 120 is according to active power ring 320, reactive power ring 330, active
Electric current loop 132 and reactive current ring 134 work, i.e. the work of PQ (active/idle) control mode.And in this mode, unsteady flow
Device 120 can carry out idle harmonic compensation to power network current according to actual conditions, improve the quality of power supply of PCC point civil powers.
City's electrical anomaly, current transformer 120 from grid-connect mode switch seamlessly to off-network pattern when, current transformer 120 is according to frequency loop 310, voltage
Ring 330, active power ring 320, reactive power ring 330, watt current ring 132 and reactive current ring 134 work, i.e. VF (constant pressure/
Constant frequency) control mode work, by the control to current transformer output voltage frequency and amplitude so that reach to current transformer export
The regulation of active power and reactive power, real-time response load power change demand, and then quick maintenance current transformer 120 exports electricity
The stabilization of pressure amplitude value, the demand that the full load quality of power supply high is powered.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of power adjusting of uninterruptible power system controls circuit, it is characterised in that including：
Frequency detection circuit, is detected and as first frequency for the frequency to the uninterruptible power system output voltage
Value of feedback is exported；The frequency detection circuit is additionally operable to detect the frequency of line voltage and as second frequency value of feedback
Output；
Power-sensing circuit, is detected for the power output to the uninterruptible power system and is fed back as power output
Value output；
Mode switching circuit, including the first grid-connected contact, the first off-network contact, the second grid-connected contact and the second off-network contact；Institute
State the first grid-connected contact to be connected with the frequency detection circuit, to receive the second frequency value of feedback；First off-network is touched
Point is for receiving default given frequency value；The second grid-connected contact is used to receive line voltage value of feedback；Second off-network
Contact is used to receive default given magnitude of voltage；The mode switching circuit is used for the described first grid-connected contact under grid-connect mode
Input exported as frequency set-point, using the input of the described second grid-connected contact as output voltage set-point, and in off-network
Using the input of the first off-network contact as frequency set-point, using the input of the second off-network contact as output under pattern
Voltage set-point is exported；And
Power conditioning circuitry, connects with the frequency detection circuit, the power-sensing circuit and the mode switching circuit respectively
Connect；Output end of the power conditioning circuitry also with the uninterruptible power system is connected, to receive its output voltage value of feedback；
The power conditioning circuitry is used for anti-according to the power output value of feedback, the first frequency value of feedback, the output voltage
Feedback value, the frequency set-point and the output voltage set-point determine power regulating signals.
2. power adjusting according to claim 1 controls circuit, it is characterised in that the frequency detection circuit includes first
Frequency detecting unit and second frequency detection unit；The first frequency detection unit is used for defeated to the uninterruptible power system
The frequency for going out voltage is detected and exported as first frequency value of feedback；The second frequency detection unit is used for power network electricity
The frequency of pressure is detected and exported as second frequency value of feedback.
3. power adjusting according to claim 2 controls circuit, it is characterised in that the first frequency detection unit includes
First phaselocked loop and the first converter unit；First phaselocked loop respectively with the output end of the uninterruptible power system and described
First converter unit is connected；First phaselocked loop is used to detect the phase of the uninterruptible power system output voltage；It is described
First converter unit is used to obtain the first frequency value of feedback according to the phse conversion of input.
4. power adjusting according to claim 2 controls circuit, it is characterised in that the second frequency detection unit includes
Second phaselocked loop and the second converter unit；Second phaselocked loop is connected with power network and second converter unit respectively；It is described
Second phaselocked loop is used to detect the phase of line voltage；Second converter unit is used to be obtained according to the phse conversion of input
To the second frequency value of feedback.
5. power adjusting according to claim 1 controls circuit, it is characterised in that the mode switching circuit includes first
Switching switch, the second switching switch and control unit；
The fixing end of the first switching switch is connected with the power conditioning circuitry；First contact of the first switching switch
It is the described first grid-connected contact；Second contact of the first switching switch is the first off-network contact；
The fixing end of the second switching switch is connected with the power conditioning circuitry；First contact of the second switching switch
It is the described second grid-connected contact；Second contact of the second switching switch is the second off-network contact；
Described control unit is used to switch and described described first switching according to the mode of operation of the uninterruptible power system
Second switching switch switches over control.
6. power adjusting according to claim 5 controls circuit, it is characterised in that the power-sensing circuit is used for institute
The active power and reactive power for stating uninterruptible power system output detect and active power of output value of feedback and idle work(
Rate value of feedback；
The power conditioning circuitry includes active adjustment unit and Reactive-power control unit；First input of the active adjustment unit
End is connected with the frequency detection circuit, to receive the first frequency value of feedback；Second input of the active adjustment unit
Hold and be connected with the fixing end of the described first switching switch, to receive the frequency set-point；The 3rd of the active adjustment unit
Input is also connected with the power-sensing circuit, to receive the active power feedback value；The active adjustment unit is used for
Determine that active power regulation is believed according to the first frequency value of feedback, the frequency set-point and the active power feedback value
Number；
The first input end of the Reactive-power control unit is connected with the output end of the uninterruptible power system, described defeated to receive
Go out voltage feedback value；Second input of the Reactive-power control unit is connected with the fixing end of the described second switching switch, to connect
Receive the output voltage set-point；3rd input of the Reactive-power control unit is also connected with the power-sensing circuit, with
Receive the reactive power value of feedback；The Reactive-power control unit is used for according to the output voltage value of feedback, output electricity
Pressure set-point and the reactive power value of feedback determine reactive power Regulate signal.
7. power adjusting according to claim 6 controls circuit, it is characterised in that the active adjustment unit is included successively
The frequency loop and active power ring of connection；
The frequency loop includes the first adder and frequency ring controller that are sequentially connected；First input of the first adder
Hold as the first input end of the active adjustment unit；Second input of the first adder is used as the active regulation
Second input of unit；The first adder is used to ask between the frequency set-point and the first frequency value of feedback
Difference and export to the frequency ring controller；The frequency ring controller is used to carry out closed-loop control generation to the difference
Active power set-point；
The active power ring includes the second adder and active ring controller that are sequentially connected；The first of the second adder
Input as the active adjustment unit the 3rd input；Second input of the second adder and the frequency loop
Controller is connected；The second adder is used to ask between the active power set-point and the active power feedback value
Difference is simultaneously exported to the active ring controller；The active ring controller is used to carry out closed-loop control generation to the difference being input into
Active power regulation signal.
8. power adjusting according to claim 6 controls circuit, it is characterised in that the Reactive-power control unit is included successively
The Voltage loop and reactive power ring of connection；
The Voltage loop includes the 3rd adder and the voltage ring controller that are sequentially connected；First input of the 3rd adder
Hold as the first input end of the Reactive-power control unit；Second input of the 3rd adder is used as the Reactive-power control
Second input of unit；3rd adder is used to ask for the output voltage set-point and the output voltage value of feedback
Between difference and export to the voltage ring controller；The voltage ring controller is used to carry out closed loop control to the difference being input into
System generation reactive power set-point；
The reactive power ring includes the 4th adder being sequentially connected and idle ring controller；The first of 4th adder
Input as the Reactive-power control unit the 3rd input；Second input and the Voltage loop of the 4th adder
Controller is connected；4th adder is used to ask between the reactive power set-point and the reactive power value of feedback
Difference is simultaneously exported to the idle ring controller；The idle ring controller is used to carry out closed-loop control generation to the difference being input into
Reactive power Regulate signal.
9. power adjusting according to claim 1 control circuit, it is characterised in that also including control signal generative circuit and
Drive circuit；
The control signal generative circuit is connected with the power conditioning circuitry；The control signal generative circuit also with it is described not
The output end connection of uninterruptible power system, to receive its output current value of feedback；The control signal generative circuit is used for basis
The power regulating signals and output current value of feedback generation control signal；
The drive circuit is connected with the control signal generative circuit, after the control signal is converted into drive signal
Export to the uninterruptible power system.
10. a kind of uninterruptible power system, it is characterised in that including：
Energy storage device；
Current transformer, is connected between the energy storage device and points of common connection；And
Power adjusting control circuit as described in claim 1~9 is any；The power adjusting control circuit is used to export described
Power regulating signals are controlled to the current transformer with the output to the current transformer, so as to realize to the uninterrupted power source
The control of system output power.
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