CN107887968A - Uninterruptible power system - Google Patents

Uninterruptible power system Download PDF

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Publication number
CN107887968A
CN107887968A CN201610872568.1A CN201610872568A CN107887968A CN 107887968 A CN107887968 A CN 107887968A CN 201610872568 A CN201610872568 A CN 201610872568A CN 107887968 A CN107887968 A CN 107887968A
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CN
China
Prior art keywords
current
phase
loop
voltage
circuit
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Application number
CN201610872568.1A
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Chinese (zh)
Inventor
张涛
于玮
徐海波
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East Group Co Ltd
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East Group Co Ltd
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Priority to CN201610872568.1A priority Critical patent/CN107887968A/en
Publication of CN107887968A publication Critical patent/CN107887968A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02J9/061—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 for DC powered loads
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

A kind of uninterruptible power system, including：Energy storage device；Current transformer；Cutting-in control circuit；Off-network control circuit includes outer voltage circuit, current inner loop circuit and load-side current harmonics suppression circuit；Mode selector switch and control circuit.The above-mentioned uninterruptible power system harmonic wave and reactive component extraction harmonics and reactive compensation command signal of meeting in civil power during grid-connected carries out idle harmonic compensation to output, reduces electric energy loss.Off-network control circuit is not involved in controlling in grid-connect mode, but can generate off-network control signal.When system by it is grid-connected be switched to off-network pattern when, current transformer according to off-network control signal to output be controlled, realize the seamless switching of grid-connected/off-network pattern.Meanwhile uninterruptible power system, when being in off-network pattern, current transformer carries out harmonic compensation under the control of off-network control signal to load current, and the harmonic content in load current is suppressed into minimum, the high quality of power supply power supply to load is realized.

Description

Uninterruptible power system
Technical field
The present invention relates to power supply technical field, more particularly to a kind of uninterruptible power system.
Background technology
With the rapid growth of data center power sources load in recent years, energy efficiency indexes require more and more higher.For applied to The uninterruptible power system (UPS) of high-density data center, to be not only that information technoloy equipment is powered, also to ensure the sky of information technoloy equipment operation The power supply of the auxiliary equipments such as tune, 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 providing the UPS of electric power safeguard for it.In traditional data center's power supply mode, typically using base In the on line type UPS power supply of double converter techniques.The major defect of this on line type UPS is the electric energy powered in forceful electric power net under environment It is lost larger, operating cost is higher, also, traditional UPS can not effectively be improved in power network quality of power supply difference, therefore Can not meet the needs of data center's high quality power supply.
The content of the invention
Based on this, it is necessary to provide a kind of uninterruptible power system that high quality of power supply power supply can be carried out to load.
A kind of uninterruptible power system, including：Energy storage device, for storing and discharging electric energy；Current transformer, it is connected to described Between energy storage device and points of common connection, for according to cutting-in control signal or off-network control signal to the uninterrupted power source The output voltage or output current of system are controlled；Cutting-in control circuit, the input difference of the cutting-in control circuit The output end of civil power side, the current transformer with the points of common connection is connected；It is described become cutting-in control circuit output end with The grid-connected contact point connection of mode selector switch；The cutting-in control circuit is for the harmonic wave in mains current and idle point Amount extraction harmonics and reactive compensation command signal, and exported according to the harmonics and reactive compensation command signal, the current transformer The output current feedback signal at end generates the cutting-in control signal；In off-network control circuit, including outer voltage circuit, electric current Loop circuit and load-side current harmonics suppression circuit；The first input end of the outer voltage circuit and the output of the current transformer End connection, to receive the output voltage feedback signal of the current transformer；Second input of the outer voltage circuit is used to connect Receive Voltage loop given voltage value；The outer voltage circuit is used for according to the Voltage loop given voltage value and the output voltage Feedback signal generates current inner loop Setting signal and exports the first input end to the current inner loop circuit；The load-side electricity Stream harmonic suppression circuit is connected between the load-side of the points of common connection and the second input of the current inner loop circuit； The load-side current harmonics suppression circuit is used to the harmonic component in load-side electric current is detected and extracted and is generated negative Carry side current harmonics compensating instruction signal；3rd input of the current inner loop circuit connects with the output end of the current transformer Connect, to receive the output current feedback signal of the current transformer；The output end of the current inner loop circuit and the pattern switching The off-network contact portion of switch；The current inner loop circuit is used for according to the current inner loop Setting signal, load-side electricity Flow harmonic compensation command signal and the output current feedback signal generates the off-network control signal；The pattern switching is opened Close, the fixing end of the mode selector switch is connected with the control terminal of the current transformer；The movable end of the mode selector switch With the grid-connected contact or the off-network contact portion；And control circuit, it is connected with the mode selector switch；The control Circuit processed is used to control the mode selector switch to connect grid-connected contact when civil power is normal, and the uninterruptible power system enters Grid-connect mode；The control circuit is additionally operable to connect off-network contact in mode selector switch described in city's electrical anomaly time control system, described Uninterruptible power system enters off-network pattern.
In one of the embodiments, the load-side current harmonics suppression circuit includes first harmonic and suppresses unit, the Two harmonics restraint units and summing elements；The first harmonic suppresses load-side and the institute that unit is connected to the points of common connection State between summing elements；The second harmonic suppresses unit and is connected to the load-side of the points of common connection and the summing elements Between；The first harmonic suppresses unit and the second harmonic suppresses unit and is used for the different subharmonic in load-side electric current Component is extracted and forms corresponding harmonic component compensating instruction signal；The summing elements are used to press down the first harmonic The harmonic component compensating instruction signal that unit processed and the second harmonic suppress unit extraction is negated and added up to obtain State load-side current harmonics compensating instruction signal.
In one of the embodiments, it is that 5 subharmonic suppress unit that the first harmonic, which suppresses unit,；5 subharmonic Suppressing unit includes the first three phase static coordinate for being sequentially connected with to two-phase rotating coordinate system conversion module, the first LPF Device, first liang of cordic phase rotator to three-phase static coordinate system conversion module and the second three phase static coordinate to two cordic phase rotators It is conversion module；The first three phase static coordinate is used for 5 in load-side electric current to two-phase rotating coordinate system conversion module Subharmonic is transformed to DC quantity and is transformed to other order harmonic components in load-side electric current to form d axles electricity after AC ripple amount Stream and q shaft currents；First low pass filter is used to filter out the AC ripple amount in the d shaft currents and the q shaft currents D axles direct current signal and q axle direct current signals that 5 subharmonic suppress unit are generated afterwards；First liang of cordic phase rotator is quiet to three-phase Only coordinate system transformation module is used to 5 subharmonic suppressing the d axles direct current signal of unit and q axle direct current signals are transformed to 5 times The three-phase output harmonic wave compensating instruction signal of harmonic component；The second three phase static coordinate becomes to two-phase rotating coordinate system to change the mold Block is used for 5 subharmonic being transformed to the three-phase output harmonic wave compensating instruction signal of 5 order harmonic components under dq axis coordinate systems Component compensation command signal, and export to the summing elements.
In one of the embodiments, it is that 7 subharmonic suppress unit that the second harmonic, which suppresses unit,；7 subharmonic Suppressing unit includes the 3rd three phase static coordinate that is sequentially connected with to two-phase rotating coordinate system conversion module, the second LPF Device, second liang of cordic phase rotator to three-phase static coordinate system conversion module and the 4th three phase static coordinate to two cordic phase rotators It is conversion module；The 3rd three phase static coordinate is used for 7 in load-side electric current to two-phase rotating coordinate system conversion module Subharmonic is transformed to DC quantity and is transformed to other order harmonic components in load-side electric current to form d axles electricity after AC ripple amount Stream and the output of q shaft currents；Second low pass filter exchanges arteries and veins for filtering out the d shaft currents with the q shaft currents D axles direct current signal and q axle direct current signals that 7 subharmonic suppress unit are generated after momentum；Second liang of cordic phase rotator is to three Phase rest frame conversion module is used to 7 subharmonic suppressing the d axles direct current signal of unit and q axle direct current signals are transformed to The three-phase output harmonic wave compensating instruction signal of 7 order harmonic components；The 4th three phase static coordinate becomes to two-phase rotating coordinate system Mold changing block is used for 7 times be transformed to the three-phase output harmonic wave compensating instruction signal of 7 order harmonic components under dq axis coordinate systems Harmonic component compensating instruction signal, and export to the summing elements.
In one of the embodiments, in addition to drive signal generator；The drive signal generator is connected to described Between the fixing end of mode selector switch and the control terminal of the current transformer；The drive signal generator is used for according to simultaneously Net control signal or off-network control signal generation drive signal, to be controlled to the current transformer.
In one of the embodiments, the cutting-in control circuit includes the harmonic and reactive currents extraction electricity being sequentially connected Road and current loop control circuit；The 5th three phase static that the harmonic and reactive currents extraction circuit includes being sequentially connected with is sat Mark system arrives two-phase rotating coordinate system conversion module, the 3rd low pass filter, the 3rd liang of cordic phase rotator to three-phase static coordinate system Conversion module and the first three-phase adder；Input of the 5th three phase static coordinate to two-phase rotating coordinate system conversion module End is connected to the civil power side of the points of common connection, and the input also with the first three-phase adder is connected；Described 5th Three phase static coordinate is used to be converted to low frequency line three-phase mains electric current to two-phase rotating coordinate system conversion module The 3rd low pass filter, which is sent into, after the d axles DC quantity and q axle DC quantities of ripple is filtered processing respectively；3rd two-phase Rotational coordinates is used to the d axles DC quantity after processing and q axle DC quantities being converted into three-phase to three-phase static coordinate system conversion module Power network current fundametal compoment；The first three-phase adder is used for the three phase network for obtaining harmonic and reactive currents extraction circuit Current first harmonics component obtains three-phase mains electric current harmonics and reactive compensation after being subtracted each other with the three-phase mains electric current instructs Signal.
In one of the embodiments, the current loop control circuit of the cutting-in control circuit includes second be sequentially connected with Three-phase adder and the first current loop controller；The input of the second three-phase adder respectively with the one or three additive process The output end of device, the connection of the output end of current transformer；The output end of first current loop controller and the mode selector switch Grid-connected contact portion；The second three-phase adder is used to the harmonics and reactive compensation of the three-phase mains electric current instructing letter Number with the output current feedback signal subtracted each other after obtain three-phase error signal；First current loop controller is then used for Closed-loop control is carried out according to the three-phase error signal and generates three-phase grid control signal.
In one of the embodiments, the outer voltage circuit includes the Voltage loop adder and Voltage loop being serially connected Controller；The first input end of the Voltage loop adder is connected with the output end of the current transformer；The Voltage loop adder The second input be used for receive the Voltage loop given voltage value；The Voltage loop adder is used to give the Voltage loop Magnitude of voltage is subtracted each other to obtain voltage error signal with the output voltage feedback signal；The voltage ring controller is used for basis The error signal carries out closed-loop control and generates the current inner loop Setting signal；The current inner loop circuit includes sequentially connecting The electric current loop adder and the second current loop controller connect；The first input end of the electric current loop adder and the Voltage loop control The output end connection of device processed；Second input of the electric current loop adder is defeated with the load-side current harmonics suppression circuit Go out end connection；3rd input of the electric current loop adder is connected with the output end of the current transformer；Second electric current loop The output end of controller and the off-network contact portion of the mode selector switch；The second electric current loop adder is used for by described in After current inner loop Setting signal is subtracted each other with the output current feedback signal, with the load-side current harmonics compensating instruction Signal is added to obtain current error signal；Second current loop controller is used to carry out closed loop according to the current error signal Control and generate the off-network control signal.
In one of the embodiments, the outer voltage circuit also includes the 6th three phase static coordinate to two-phase rotation seat Mark system conversion module；The Voltage loop adder includes Voltage loop d axles adder and Voltage loop q axle adders；The Voltage loop Controller includes Voltage loop d axis controllers and Voltage loop q axis controllers；The 6th three phase static coordinate to two cordic phase rotators It is that the input of conversion module is connected with the output end of the current transformer, the 6th three phase static coordinate to two cordic phase rotators It is that the output end of conversion module is connected with the Voltage loop d axles adder, Voltage loop q axle adders respectively；The current inner loop It is quiet to three-phase to two-phase rotating coordinate system conversion module and the 4th liang of cordic phase rotator that circuit also includes the 7th three phase static coordinate Only coordinate system transformation module；The electric current loop adder includes electric current loop d axles adder and electric current loop q axle adders；Described Two current loop controllers include electric current loop d axis controllers and electric current loop q axis controllers；The 7th three phase static coordinate is to two-phase The input of rotating coordinate system conversion module is connected with the output end of the current transformer；The 7th three phase static coordinate is to two-phase The output end of rotating coordinate system conversion module is connected with the electric current loop d axles adder, the electric current loop q axle adders respectively； The input of the 4th liang of cordic phase rotator to three-phase static coordinate system conversion module controls with the electric current loop d axles respectively The output end connection of device, electric current loop q axis controllers, the 4th liang of cordic phase rotator to three-phase static coordinate system conversion module The output end then off-network contact portion with the mode selector switch.
In one of the embodiments, the current transformer is two way convertor；The control circuit is additionally operable to the storage Either residual capacity carries out monitoring and output voltage values or remaining capacity value in real time to the voltage of energy device；The uninterrupted power source System also includes comparison circuit；The comparison circuit is connected with the control circuit, the two way convertor respectively；The comparison Circuit is used to judge whether the magnitude of voltage or the remaining capacity value are less than preset value in grid-connect mode, and in the electricity Pressure value or the remaining capacity value export charging signals when being less than preset value；The current transformer is according to the charging signals by inverse Change state switchs to rectification state and the energy storage device is charged.
Above-mentioned uninterruptible power system has off-network and grid-connected two kinds of mode of operations.When civil power is normal, uninterrupted power source System is grid-connect mode, and harmonic wave and reactive component extraction harmonics and reactive compensation of the cutting-in control circuit in mains current refer to Make and cutting-in control signal is generated according to harmonics and reactive compensation instruction and output current feedback signal, with to current transformer Output is controlled, so as to which harmonics and reactive compensation electric current is injected into power network to carry out harmonics and reactive compensation, and then to electricity Net quality is improved, and reduces electric energy loss, has the higher quality of power supply.Also, during grid-connected, off-network control electricity Although road is not involved in controlling, but still in running status, it can be according to the given letter of the current inner loop of outer voltage circuit evolving Number, output current feedback signal and load-side current harmonics suppression circuit output load-side current harmonics compensating instruction signal Generate off-network control signal.Therefore, when uninterruptible power system switches to off-network pattern from grid-connect mode, current transformer can root It is exported according to the off-network control signal of off-network control circuit output and is controlled, so as to realize the seamless of grid-connected/off-network pattern Switching, avoids current transformer overcurrent protection interruption of power supply problem caused by switching shock.Meanwhile uninterruptible power system be in from During net pattern, current transformer can carry out harmonic compensation under the control of off-network control signal to load current, by load current Harmonic content be suppressed to minimum, realize to the power supply of the high quality of power supply of load.
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；
Fig. 3 is the effect diagram improved when uninterruptible power system is run to the quality of power supply；
The effect diagram that Fig. 4 is that uninterruptible power system is grid-connected when arriving off-network seamless switching.
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 in an embodiment.The uninterruptible power system fills including energy storage 110, current transformer 120, cutting-in control circuit 130, off-network control circuit 140, mode selector switch 150, drive signal is put to occur Device 160 and control circuit.
Energy storage device 110 is used to store electric energy, so as to outwards export electric energy so that load carries out normal work.Energy storage Device 110 can be realized using the battery types that uninterruptible power system is commonly used.
Current transformer 120 is connected between energy storage device 110 and points of common connection PCC.Current transformer 120 is used for according to simultaneously network control The off-network control signal that the cutting-in control signal or off-network control circuit 140 that circuit 130 processed exports export is to uninterrupted power source The output voltage or output current of system are controlled, so as to meet the power demands of load.
Cutting-in control circuit 130 is used to generate cutting-in control signal, and the work to current transformer 120 during grid-connected is carried out Control.Specifically, the input of cutting-in control circuit 130 respectively the civil power side with points of common connection PCC, current transformer 120 it is defeated Go out end connection.The output end of cutting-in control circuit 130 and the grid-connected contact portion of mode selector switch 150.Cutting-in control circuit 130 harmonic waves being used in mains current and reactive component extraction harmonics and reactive compensation command signal, and according to the harmonic wave With reactive-load compensation command signal, the output current feedback signal of the output end of current transformer 120 generation cutting-in control signal.Specifically, Cutting-in control circuit 130 includes harmonic and reactive currents extraction circuit 132 and current loop control circuit 134.Harmonic wave and idle electricity The input of stream extraction circuit 132 is connected to points of common connection PCC civil power side, output end then with current loop control circuit 134 Input connection.Output end of the input of current loop control circuit 134 also with current transformer 120 is connected, to receive current transformer 120 output current feedback signal.The output end of current loop control circuit 134 connects with the grid-connected contact of mode selector switch 150 Connect.Harmonic and reactive currents extraction circuit 132 is used for harmonic wave in mains current and reactive component extraction harmonic wave and idle Compensating instruction signal is simultaneously sent in current loop control circuit 134.Current loop control circuit 134 refers to according to harmonics and reactive compensation The output current feedback signal of signal and current transformer 120 is made to generate cutting-in control signal.
Off-network control circuit 140 is used to generate off-network control signal, is carried out with the work to current transformer during off-network 120 Control.Off-network control circuit 140 includes outer voltage circuit 142, load-side current harmonics suppression circuit 144 and current inner loop electricity Road 146.Wherein, the first input end of outer voltage circuit 142 is connected with the output end of current transformer 120, to receive current transformer 120 Output voltage feedback signal.Second input of outer voltage circuit 142 is used for receiving voltage ring given voltage value.Outside voltage Loop circuit 142 is used to generate current inner loop Setting signal according to Voltage loop given voltage value and output voltage feedback signal.Electric current The first input end of interior loop circuit 146 is connected with the output end of outer voltage circuit 142, with the current inner loop that receiver exports to Determine signal.Second input of current inner loop circuit 146 is connected with the output end of load-side current harmonics suppression circuit 144.Electricity The 3rd input of loop circuit 146 is connected with the output end of current transformer 120 in stream, anti-to receive the output current of current transformer 120 Feedback signal.The output end of current inner loop circuit 146 and the off-network contact portion of mode selector switch 150.Load-side current harmonics The input of suppression circuit 144 is connected to points of common connection PCC load-side.Load-side current harmonics suppression circuit 144 is used for Harmonic component in load-side electric current is detected and extracted and generates load-side current harmonics compensating instruction signal.Specifically Ground, load-side current harmonics suppression circuit 144 include first harmonic and suppress unit 1442, second harmonic suppression unit 1444 and tire out Add unit 1446.First harmonic suppress unit 1442 be connected to points of common connection PCC load-side and summing elements 1446 it is defeated Enter between end.Second harmonic suppresses unit 1444 and is connected to points of common connection PCC load-side and the input of summing elements 1446 Between end.The output end of summing elements 1446 is connected with the second input of current inner loop circuit 146.First harmonic suppresses unit 1442 and second harmonic suppress unit 1444 and be used to extract the different order harmonic components in load-side electric current and be formed pair Exported after the harmonic component compensating instruction signal answered to summing elements 1446 negate it is cumulative (also will result to be multiplied by -1 tired Add) so as to obtaining load-side current harmonics compensating instruction signal.In the present embodiment, it is 5 times that first harmonic, which suppresses unit 1442, Harmonics restraint unit, second harmonic suppress unit 1444 and then suppress unit for 7 subharmonic.First harmonic suppresses unit 1442 and the Two harmonics restraint units 1444 maximum to harmonic content in load-side electric current 5 times and 7 order harmonic components are extracted, so as to right 5 subharmonic and 7 order harmonic components in the output current of uninterrupted power source compensate, by the harmonic wave in final load current Content is suppressed to minimum, while ensures that whole load-side current harmonics suppression circuit 144 will not be excessively complicated.Current inner loop circuit 146 are believed according to the current inner loop Setting signal of input, output current feedback signal and load-side current harmonics compensating instruction Number generation off-network control signal.Off-network control signal can be entered according to load-side current harmonics compensating instruction signal to load current Row harmonic compensation, so as to which the harmonic content in load current is suppressed into minimum, realize the high quality of power supply power supply to load. In the present embodiment, cutting-in control circuit 130 and off-network control circuit 140 are located always in uninterruptible power system running In running status, but it is whether that participating in control then needs to control according to the state of mode selector switch 150.
The fixing end of mode selector switch 150 is connected with the input of drive signal generator 160, and is connected with control circuit Connect.The movable end of mode selector switch 150 and the grid-connected contact of mode selector switch 150 or off-network contact portion.Pattern is cut Change switch 150 to be used to switch under the control of control circuit, so as to be controlled output.Drive signal generator 160 Drive signal is generated according to the output signal of mode selector switch 150, to be controlled to current transformer 120, and then controls unsteady flow Device 120 is controlled to output voltage or output current, to meet the power supply quality demand of load-side.In the present embodiment, Control circuit includes observation circuit 172 and gate-controlled switch 174.Whether observation circuit 172 is normal for monitoring civil power, and is supervising Measure civil power it is normal when export the first monitoring signals, in city during electrical anomaly namely commercial power interruption power supply or civil power occur drastically become Change the unstable monitoring signals of timing output second.Wherein, it is grid-connected tactile to be used for the connection of control mode switch switch 150 for the first monitoring signals Point, the second monitoring signals are then used for control mode switch switch 150 and connect off-network contact.Gate-controlled switch 174 be connected to civil power and Between points of common connection PCC.Gate-controlled switch 174 turns under the control of the first monitoring signals so that uninterruptible power system enters Enter grid-connect mode, it disconnects under the control of the second monitoring signals, so that uninterruptible power system enters off-network pattern.
Control circuit grid-connected contact of control mode switch switch connection when civil power is normal, uninterruptible power system enter simultaneously Net pattern.Now, the cutting-in control signal output that mode selector switch 150 generates cutting-in control module 130 is to drive signal Generator 160.Drive signal generator 160 is according to the control terminal of the cutting-in control signal generation drive signal to current transformer 120. Current transformer 120 exports under the control of the drive signal to be actually needed harmonics and reactive compensation electric current and is injected into power network, and original Harmonic and reactive currents in power network current offset, and so as to realize power network current sineization, the effect of unity power factor, subtract Small electric energy loss, improves energy efficiency index.For control circuit in city's electrical anomaly, control mode switch switch 150 connects off-network Contact, and grid-connected contact is disconnected, uninterruptible power system enters off-network pattern, is individually supplied from uninterruptible power system to load Electricity.Because off-network control circuit 140 is also at running status in the pattern of being incorporated into the power networks.Therefore be able to will be given birth to when switching and completing Into off-network control signal export to current transformer 120.Current transformer 120 can be according to the off-network control signal to uninterrupted power source system The output current of system is controlled, and carries out harmonic compensation to load current, so as to offset the harmonic component in load-side electric current, Realize and the high quality of power supply of load is powered.Before and after pattern switching, the off-network control signal of the output of off-network control circuit 140 It is identical, without big mutation, so as to reduce uninterruptible power system as it is grid-connected switch to off-network pattern when caused by switch punching Hit, realize grid-connected/off-network pattern seamless switching.
Above-mentioned uninterruptible power system has off-network and grid-connected two kinds of mode of operations.When civil power is normal, uninterrupted power source System is grid-connect mode, and harmonic wave and reactive component of the cutting-in control circuit 130 in mains current extract harmonic wave and idle benefit Repay instruction and cutting-in control signal is generated according to harmonics and reactive compensation instruction and output current feedback signal, with to unsteady flow The output of device is controlled, so as to which harmonics and reactive compensation electric current is injected into power network to carry out harmonics and reactive compensation, and then Power grid quality is improved, reduces electric energy loss, there is the higher quality of power supply.Also, during grid-connected, off-network control Although circuit 140 processed is not involved in controlling, still in running status, it can be according to the current inner loop of outer voltage circuit evolving The load-side current harmonics compensation of Setting signal, output current feedback signal and the output of load-side current harmonics suppression circuit refers to Make signal generation off-network control signal.Therefore, when uninterruptible power system switches to off-network pattern from grid-connect mode, current transformer 120 can export to it and be controlled according to the off-network control signal that off-network control circuit 140 exports, so as to realize it is grid-connected/from The seamless switching of net pattern, avoid current transformer overcurrent protection interruption of power supply problem caused by switching shock.Meanwhile uninterrupted electricity When source system is in off-network pattern, the load-side current harmonics compensation generated by load-side current harmonics suppression circuit 144 refers to Signal is made to carry out harmonic compensation to uninterruptible power system output current, so as to offset the harmonic component in load current, Further realize and the high quality of power supply of load is powered.
In the present embodiment, above-mentioned uninterruptible power system also includes filter circuit 180 and reactor 190 and bypass is opened Close (not shown).Filter circuit 180 is connected between the output end of current transformer 120 and points of common connection PCC.Filter circuit 180 are used to be filtered processing to the output current of current transformer 120.Specifically, filter circuit 120 is LC filter circuits.Reactance Device 190 is connected between gate-controlled switch 174 and points of common connection PCC.Reactor 190 is used to open civil power and load isolation, really Protect the sineization of grid side electric current.By-pass switch is then connected between load and civil power, and is connected with control circuit.By-pass switch For being turned on when uninterruptible power system needs and repaired, so as to directly be powered to the load by civil power, it is ensured that uninterrupted electricity Load still is able to normal work during the system exception of source.
Fig. 2 is the circuit theory diagrams of the uninterruptible power system in an embodiment.In the present embodiment, harmonic wave and idle electricity Stream extraction circuit 132 includes the 5th three phase static coordinate that is sequentially connected with to two-phase rotating coordinate system conversion module the (the i.e. the 5th Abc/dq conversion modules) the 1322, the 3rd low pass filter 1324, the 3rd liang of cordic phase rotator to three-phase static coordinate system become change the mold Block (i.e. the 3rd dq/abc conversion modules) 1326 and the first three-phase adder 1328.5th abc/dq conversion modules 1322 it is defeated Enter the civil power side that end is connected to points of common connection PCC, for receiving three-phase mains electric current (igA、igB、igC).5th abc/dq becomes Input of the input also with the first three-phase adder 1328 for changing the mold block 1322 be connected, so that by three-phase mains electric current (igA、 igB、igC) input into the first three-phase adder 1328.5th abc/dq conversion modules 1322 are used to realize that abc three phase statics are sat Mark is to the conversion of dq two-phase rotating coordinate systems, i.e., by three-phase mains electric current (igA、igB、igC) be converted to the d containing low-frequency ripple Axle DC quantity IgdhWith q axle DC quantities Igqh, and be respectively fed into the 3rd low pass filter 1324.3rd low pass filter 1324 Respectively to the d axle DC quantities I of inputgdhWith q axle DC quantities IgqhProcessing is filtered to obtain corresponding pure d axle DC quantities IgdWith q axle DC quantities Igq.The input of 3rd dq/abc conversion modules 1326 and the output end of the 3rd low pass filter 1324 connect Connect, input of its output end then with the first three-phase adder 1328 is connected.3rd dq/abc conversion modules 1326 are used for will be defeated The d axle DC quantities I enteredgdWith q axle DC quantities IgqIt is converted into three phase network current first harmonics component (igAf、igBf、igCf).General three-phase Power network current can be analyzed to fundamental current, harmonic and reactive currents two parts, i.e.,：
igA=igAf+igAh；
igB=igBf+igBh；
igC=igCf+igCh。
First three-phase adder 1328 is then used for three phase network current first harmonics component (igAf、igBf、igCf) and three-phase mains Electric current (igA、igB、igC) subtracted each other after obtain the harmonics and reactive compensation command signal (i of three-phase mains electric currentgAhref、 igBhref、igChref), i.e.,：
igAf- igA=igAf- (igAf+igAh)=- igAh=igAhref。
igBf- igB=igBf- (igBf+igBh)=- igBh=igBhref。
igCf- igC=igCf- (igCf+igCh)=- igCh=igChref。
The the second three-phase adder 1342 and the first current loop controller 1344 that current loop control circuit 134 is sequentially connected with. Wherein, the input of the second three-phase adder 1342 output end and current transformer 120 with the first three-phase adder 1328 respectively Output end connection.Input of the output end of second three-phase adder 1342 then with the first current loop controller 1344 is connected. The output end of first current loop controller 1344 is connected with the grid-connected contact 1 of mode selector switch 150.Second three-phase adder The 1342 harmonics and reactive compensation command signal (i for the first three-phase adder 1328 to be exportedgAhref、igBhref、igChref) with Output current feedback signal (the i of the output end of current transformer 120A、iB、iC) subtracted each other after obtain error signal after be sent to first In current loop controller 1344.First current loop controller 1344 is used to carry out closed-loop control and generation three according to the error signal Phase cutting-in control signal (Varef1、Vbref1、Vcref1).In the present embodiment, the first current loop controller 1344 is pi regulator.
Outer voltage circuit 142 includes the 6th three phase static coordinate to two-phase rotating coordinate system conversion module the (the i.e. the 6th Abc/dq conversion modules) 310, Voltage loop adder and voltage ring controller.Wherein, Voltage loop adder includes Voltage loop d Axle adder 322 and Voltage loop q axles adder 324；Voltage ring controller equally includes Voltage loop d axis controllers 332 and voltage Ring q axis controllers 334.The input of 6th abc/dq conversion modules 310 is connected with the output end of current transformer 120, its output end Then it is connected respectively with Voltage loop d axles adder 322, Voltage loop q axles adder 324.Voltage loop d axles adder 322 and Voltage loop d Axis controller 332 is connected, and Voltage loop q axles adder 324 is then connected with Voltage loop q axis controllers 334.6th abc/dq becomes mold changing Block 310 is used for the three-phase output voltage (u of the output end of current transformer 120A、uB、uC) be converted to d shaft voltage values of feedback UdWith q axles electricity Press value of feedback UqThe first input end to Voltage loop d axles adder 322 and Voltage loop q axles adder 324 is respectively fed to afterwards.Voltage Second input of ring d axles adder 322 is then used for receiving voltage ring d axle given voltage values Udref *.Voltage loop q axle adders 324 the second input is then used for receiving voltage ring q axle given voltage values Uqref *.Voltage loop d axles adder 322 is by the electricity of input Pressure ring d axle given voltage values Udref *With d shaft voltage values of feedback UdVoltage loop d axles are sent to after error signal is obtained after being subtracted each other In controller 332.Voltage loop d axis controllers 332 are used to carry out closed-loop control according to the error signal and generate d shaft current inner ring Setting signal Id *.Voltage loop q axles adder 334 is similar with the operation principle of Voltage loop q axis controllers 332, not repeat specification.
It is that 5 subharmonic suppress unit that first harmonic, which suppresses unit 1442,.5 subharmonic suppress that unit includes being sequentially connected with One three phase static coordinate is to two-phase rotating coordinate system conversion module (Cabc/dq 5Conversion module) the 412, first low pass filter (LPF) 414th, first liang of cordic phase rotator is to three-phase static coordinate system conversion module (Cdq/abc 5Conversion module) 416 and second three-phase it is quiet Only coordinate is to two-phase rotating coordinate system conversion module (the 2nd abc/dq conversion modules) 418.Cabc/dq 5Conversion module 412 is used for will Load-side electric current (iLA、iLB、iLC) in 5 subharmonic be transformed to DC quantity and by other order harmonic components in load-side electric current D shaft currents i is formed after being transformed to AC ripple amountLd5With q shaft currents iLq5.First low pass filter 414 is used to filter out d shaft currents iLd5With q shaft currents iLq5In AC ripple amount after generate 5 subharmonic suppress unit d axle direct current signals iLd5_dcWith 5 subharmonic Suppress the q axle direct current signals i of unitLq5_dc。Cdq/abc 5The d axles direct current that conversion module 416 is used to suppress 5 subharmonic unit is believed Number iLd5_dcSuppress the q axle direct current signals i of unit with 5 subharmonicLq5_dcIt is transformed to the three-phase output harmonic wave compensation of 5 order harmonic components Command signal (iLA5h、iLB5h、iLC5h).2nd abc/dq conversion modules 418 are used for the three-phase output harmonic wave of 5 order harmonic components Compensating instruction signal (iLA5h、iLB5h、iLC5h) it is transformed to 5 order harmonic components compensating instruction signal (i under dq axis coordinate systemsL5hd、 iL5hq), and export to summing elements 1446.Cabc/dq 5Conversion module 412 is to enter line translation based on 5 subharmonic (250Hz) , i.e., 5 subharmonic are converted into DC quantity and other order harmonic components in load-side electric current are transformed to AC ripple amount.
It is that 7 subharmonic suppress unit that second harmonic, which suppresses unit 1444,.7 subharmonic suppress that unit includes being sequentially connected with Three three phase static coordinates are to two-phase rotating coordinate system conversion module (Cabc/dq 7Conversion module) the 422, second low pass filter 424, Second liang of cordic phase rotator is to three-phase static coordinate system conversion module (Cdq/abc 7Conversion module) 426 and the 4th three phase static sit Mark two-phase rotating coordinate system conversion module (the 4th abc/dq conversion modules) 428.Cabc/dq 7Conversion module 422 is used for will load Side electric current (iLA、iLB、iLC) in 7 subharmonic be transformed to DC quantity and by load-side electric current other order harmonic components convert To form d shaft currents i after AC ripple amountLd7With q shaft currents iLq7.Second low pass filter 424 is used to filter out d shaft currents iLd7 With q shaft currents iLq7In AC ripple amount after generate 7 subharmonic suppress unit d axle direct current signals iLd7_dcPress down with 7 subharmonic The q axle direct current signals i of unit processedLq7_dc。Cdq/abc 7Conversion module 426 is used for the d axle direct current signals that 7 subharmonic are suppressed to unit iLd7_dcSuppress the q axle direct current signals i of unit with 7 subharmonicLq7_dcThe three-phase output harmonic wave compensation for being transformed to 7 order harmonic components refers to Make signal (iLA7h、iLB7h、iLC7h).4th abc/dq conversion modules 428 are used to mend the three-phase output harmonic wave of 7 order harmonic components Repay command signal (iLA7h、iLB7h、iLC7h) it is transformed to 7 order harmonic components compensating instruction signal (i under dq axis coordinate systemsL7hd、 iL7hq), and export to summing elements 1446.Cabc/dq 7Conversion module 422 is to enter line translation based on 7 subharmonic, i.e., by 7 Subharmonic is converted to DC quantity and other order harmonic components in load-side electric current is transformed into AC ripple amount.In the present embodiment Other abc/dq conversion modules referred to are to enter line translation based on the fundametal compoment in electric current, i.e., by fundamental wave (50Hz) Be converted to DC quantity and other harmonic components in load-side electric current are transformed to AC ripple amount.
The 5 order harmonic components compensating instruction signal (i that summing elements 1446 export first harmonic suppression unit 1442L5hd、 iL5hq) and second harmonic suppress unit 1444 export 7 order harmonic components compensating instruction signal (iL7hd、iL7hq) negated simultaneously Load-side current harmonics compensating instruction signal (i is obtained after cumulativeLhd、iLhq).In the present embodiment, summing elements 1446 include taking Reverse block 432 and cumulative adder 434.Module 432 is negated to be used to first harmonic suppressing unit 1442 and second harmonic suppression After -1 completion inversion operation is multiplied by the output of unit 1444, exports and added up to cumulative adder 434.
Current inner loop circuit 146 includes the 7th three phase static coordinate to two-phase rotating coordinate system conversion module the (the i.e. the 7th Abc/dq conversion modules) 340, electric current loop adder, the second current loop controller and the 4th liang of cordic phase rotator it is quiet to three-phase Only coordinate system transformation module (i.e. the 4th dq/abc conversion modules) 370.Wherein, electric current loop adder includes electric current loop d axle additions Device 352 and electric current loop q axles adder 354, the second current loop controller equally include electric current loop d axis controllers 362 and electric current loop q Axis controller 364.The input of 7th abc/dq conversion modules 340 is connected with the output end of current transformer 120, defeated to receive three-phase Go out current feedback signal (iA、iB、iC).The output end of 7th abc/dq conversion modules 340 respectively with electric current loop d axles adder 352 The 3rd input, electric current loop q axles adder 354 the 3rd input connection.Second input of electric current loop d axles adder 352 End is connected with the d axle output ends of the cumulative adder 434 in load-side current harmonics suppression circuit 144, to receive the d of its output Axle load side current harmonics compensating instruction signal iLhd.The second input and load-side electric current of electric current loop q axles adder 354 are humorous The q axles output end connection of cumulative adder 434 in ripple suppression circuit 144, to receive the q axle loads side current harmonics of its output Compensating instruction signal iLhq.The first input end of electric current loop d adders 352 then connects with the output end of Voltage loop d axis controllers 332 Connect, its output end is then connected with electric current loop d axis controllers 362.The first input end of electric current loop q axles adder 354 and Voltage loop q The output end connection of axis controller 334, its output end are then connected with electric current loop q axis controllers 364.Electric current loop d axis controllers 362 It is connected with input of the output end of electric current loop q axis controllers 364 respectively with the 4th dq/abc conversion modules 370.4th dq/ The output end of abc conversion modules 370 is then connected with the off-network contact 2 of mode selector switch 150.Wherein, the 7th abc/dq is converted Module 340 is used for the three-phase output current (i of current transformer 120A、iB、iC) be converted to d shaft currents IdWith q shaft currents IqAnd respectively It is fed through in electric current loop d axles adder 352 and electric current loop q axles adder 354.Electric current loop d axles adder 352 is by the d axles of input Current inner loop Setting signal Id *With d shaft currents IdSubtract each other rear and d axle loads side current harmonics compensating instruction signal iLhdAddition obtains Error signal is simultaneously sent to electric current loop d axis controllers 362 to generate d axle control signals udo.Likewise, electric current loop q axis controllers Also q axle control signals u can be generatedqo.4th dq/abc conversion modules 370 are according to the d axle control signals u of inputdoAnd q axle controls Signal u processedqoGenerate three-phase off-network control signal (Varef2、Vbref2、Vcref2).In the present embodiment, the second current loop controller and Voltage ring controller is pi regulator.
The operation principle of above-mentioned uninterruptible power system is as follows：
After system start-up, whether the continuous firing of observation circuit 172, monitoring civil power are normal.
When civil power is normal, observation circuit 172 exports the first monitoring signals control gate-controlled switch 174 and turned on, uninterrupted electricity Source system enters grid-connect mode.Now, mode selector switch 150 is connected to grid-connected contact 1, so as to defeated by cutting-in control circuit 130 Cutting-in control signal (the V gone outaref1、Vbref1、Vcref1) via drive signal generator generate drive signal after to current transformer 120 Output be controlled.The harmonics and reactive compensation electric current that current transformer 120 is actually needed according to the drive signal output received And power network is injected into, and the harmonic and reactive currents in original power network current offset, so as to realize power network current sineization, list The effect of position power factor.The schematic diagram improved when Fig. 3 is incorporated into the power networks for uninterruptible power system to the PCC point A phases quality of power supply. In t0Before moment, uninterruptible power system is not connected to the grid, by civil power powering load.Contain when loading in A phase currents During harmonic wave, A phase power network currents igAWave distortion is serious, while the advanced A phase currents of A phase voltages at PCC points, illustrates A phases power network electricity Flow igAMiddle reactive component is also bigger, it is necessary to compensate.In t0At the moment, ups power system input, it is connected to the grid, to A phases power network electricity Harmonic wave in stream and idle compensate.Because power network current, which can be analyzed to fundamental current harmonic, adds reactive current two parts, That is igA=igAf+igAh.UPS output harmonic waves and harmonic wave in reactive-load compensation Current on Grid electric current and idle compensate.Compensation Afterwards, A phases power network current waveform is changed into pure sinusoid, and A phase currents are consistent with voltage-phase, eliminates idle, only exists active component, Therefore the function that the quality of power supply improves is completed well, reduces electric energy loss.
In grid-connect mode, observation circuit 172 is also monitored and defeated to the voltage or dump energy of energy storage device 110 Go out magnitude of voltage and residual electric quantity.Uninterruptible power system then also includes comparison circuit (not shown).Comparison circuit is wherein One input is connected with observation circuit 172, and another input is then used to receive preset value, output end then with current transformer 120 Control terminal connects.Comparison circuit is used for input voltage value or remaining capacity value compared with preset value, judges battery electricity Whether pressure value or remaining capacity value are less than preset value, if it is export charging signals (for level signal).Current transformer 120 exists Rectification state is converted to by inverter mode under the control of the charging signals, carried out after rectification is carried out to civil power to energy storage device 110 Charging.After system start-up, observation circuit 172 and comparison circuit are constantly in working condition, so as to realize it is grid-connected during The control charged to energy storage device 110.Off-network control circuit is also at running status, but and be not involved in grid-connect mode Control process.
In grid-connect mode, uninterruptible power system is incorporated into the power networks with power network, but observation circuit 172 can be to civil power simultaneously Three-phase voltage is monitored in real time.Once monitoring city's electrical anomaly or interruption, gate-controlled switch 174 will be disconnected, uninterrupted power source System enters off-network pattern.Mode selector switch 150 is then forwarded to the second contact 2 by the first contact 1.Off-network control circuit 140 By the off-network control signal (V of generationaref2、Vbref2、Vcref2) by the second contact 2 be sent in drive signal generator 160 with Generate drive signal.Current transformer 120 is exported to it under the control of the drive signal and is controlled, so as to powering load.Fig. 4 A phase effect schematic diagrames when arriving off-network seamless switching for uninterruptible power system is grid-connected.In t0Before moment, uninterrupted power source system System is incorporated into the power networks, and supplies electricity to important load power supply by city, while current transformer charges from civil power power taking to energy storage device, i.e. igA=iLA+ iA.Due to charging current iAVery little, therefore load current iLANo better than mains current igA.In t0Moment, ups power system from Grid-connect mode is switched to off-network pattern, mains current igAIt is zero, current transformer 120 is switched to inversion working condition from charged state, By energy storage device 110 through the powering load of current transformer 120, now load current iLAIt is equal to UPS output currents iA, i.e. iLA= iA.During off-network, off-network control circuit 140 can extract the harmonic component in load-side electric current, and current transformer 120 is in off-network Control signal (Varef2、Vbref2、Vcref2) control under can to load current carry out harmonic compensation, will be humorous in load current Ripple content is suppressed to minimum, realizes the high quality of power supply power supply to load.
When line voltage recovers normal, gate-controlled switch 174 will be reclosed, and important load power supply is supplied electricity to by city, and Harmonic wave and reactive component in mains current carry out harmonics and reactive compensation, improve the quality of power supply of PCC points.
Above-mentioned uninterruptible power system consumes energy at least in the case of forceful electric power net, and efficiency highest, maintenance cost is extremely low, its battery Life-span be longer than traditional UPS.And whole system may be mounted at open air, the valuable interior space is saved for user.
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 that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come 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 the protection of the present 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 1. uninterruptible power system, it is characterised in that including：
    Energy storage device, for storing and discharging electric energy；
    Current transformer, it is connected between the energy storage device and points of common connection, for according to cutting-in control signal or off-network control Signal processed is controlled to the output voltage or output current of the uninterruptible power system；
    Cutting-in control circuit, the input civil power side with the points of common connection, the change respectively of the cutting-in control circuit Flow the output end connection of device；The grid-connected contact point of the output end for becoming cutting-in control circuit and mode selector switch connects；Institute Harmonic wave and the reactive component extraction harmonics and reactive compensation command signal that cutting-in control circuit is used in mains current are stated, and It is described grid-connected according to the harmonics and reactive compensation command signal, the generation of the output current feedback signal of the current transformer output end Control signal；
    Off-network control circuit, including outer voltage circuit, current inner loop circuit and load-side current harmonics suppression circuit；The electricity The first input end of the outer loop circuit of pressure is connected with the output end of the current transformer, to receive the output voltage of current transformer feedback Signal；Second input of the outer voltage circuit is used for receiving voltage ring given voltage value；The outer voltage circuit is used According to the Voltage loop given voltage value and the output voltage feedback signal generate current inner loop Setting signal and export to The first input end of the current inner loop circuit；The load-side current harmonics suppression circuit is connected to the points of common connection Between second input of load-side and the current inner loop circuit；The load-side current harmonics suppression circuit is used for load Harmonic component in the electric current of side is detected and extracted and generates load-side current harmonics compensating instruction signal；The current inner loop 3rd input of circuit is connected with the output end of the current transformer, to receive the output current feedback signal of the current transformer； The output end of the current inner loop circuit and the off-network contact portion of the mode selector switch；The current inner loop circuit is used for According to the current inner loop Setting signal, the load-side current harmonics compensating instruction signal and the output current feedback signal Generate the off-network control signal；
    The mode selector switch, the fixing end of the mode selector switch are connected with the control terminal of the current transformer；The mould The movable end and the grid-connected contact or the off-network contact portion of formula switching switch；And
    Control circuit, it is connected with the mode selector switch；The control circuit is used to control the pattern when civil power is normal Switch the grid-connected contact of switch connection, the uninterruptible power system enters grid-connect mode；The control circuit is additionally operable in civil power The mode selector switch is controlled to connect off-network contact when abnormal, the uninterruptible power system enters off-network pattern.
  2. 2. uninterruptible power system according to claim 1, it is characterised in that the load-side current harmonics suppression circuit Suppress unit including first harmonic, second harmonic suppresses unit and summing elements；The first harmonic suppresses unit and is connected to institute State between the load-side of points of common connection and the summing elements；The second harmonic suppression unit is connected to described commonly connected Between the load-side of point and the summing elements；The first harmonic suppresses unit and the second harmonic suppresses unit and is used for pair Different order harmonic components in load-side electric current are extracted and form corresponding harmonic component compensating instruction signal；It is described cumulative Unit is used to the first harmonic suppressing unit and the second harmonic suppresses the harmonic component compensating instruction letter of unit extraction Number negated and cumulative to obtain the load-side current harmonics compensating instruction signal.
  3. 3. uninterruptible power system according to claim 2, it is characterised in that it is 5 times that the first harmonic, which suppresses unit, Harmonics restraint unit；5 subharmonic suppresses the first three phase static coordinate to two cordic phase rotators that unit includes being sequentially connected with It is conversion module, the first low pass filter, first liang of cordic phase rotator to three-phase static coordinate system conversion module and the two or three Phase static coordinate is to two-phase rotating coordinate system conversion module；The first three phase static coordinate becomes to two-phase rotating coordinate system to change the mold Block is used to 5 subharmonic in load-side electric current being transformed to DC quantity and converts other order harmonic components in load-side electric current To form d shaft currents and q shaft currents after AC ripple amount；First low pass filter is used to filter out the d shaft currents and institute D axles direct current signal and q axle direct current signals that 5 subharmonic suppress unit are generated after stating the AC ripple amount in q shaft currents；Described One or two cordic phase rotator is used for the d axle direct current signals that 5 subharmonic is suppressed to unit to three-phase static coordinate system conversion module The three-phase output harmonic wave compensating instruction signal of 5 order harmonic components is transformed to q axle direct current signals；The second three phase static coordinate It is used to the three-phase output harmonic wave compensating instruction signal of 5 order harmonic components being transformed to two-phase rotating coordinate system conversion module 5 order harmonic components compensating instruction signals under dq axis coordinate systems, and export to the summing elements.
  4. 4. uninterruptible power system according to claim 2, it is characterised in that it is 7 times that the second harmonic, which suppresses unit, Harmonics restraint unit；7 subharmonic suppresses the 3rd three phase static coordinate to two cordic phase rotators that unit includes being sequentially connected with It is conversion module, the second low pass filter, second liang of cordic phase rotator to three-phase static coordinate system conversion module and the four or three Phase static coordinate is to two-phase rotating coordinate system conversion module；The 3rd three phase static coordinate becomes to two-phase rotating coordinate system to change the mold Block is used to 7 subharmonic in load-side electric current being transformed to DC quantity and converts other order harmonic components in load-side electric current To form d shaft currents and the output of q shaft currents after AC ripple amount；Second low pass filter is used to filter out the d shaft currents With the d axles direct current signal and q axle direct current signals that 7 subharmonic suppression unit is generated after the AC ripple amount in the q shaft currents；Institute State the d axle direct currents that second liang of cordic phase rotator is used to suppressing 7 subharmonic into unit to three-phase static coordinate system conversion module Signal and q axle direct current signals are transformed to the three-phase output harmonic wave compensating instruction signal of 7 order harmonic components；4th three phase static Coordinate is used to become the three-phase output harmonic wave compensating instruction signal of 7 order harmonic components to two-phase rotating coordinate system conversion module 7 order harmonic components compensating instruction signals being changed under dq axis coordinate systems, and export to the summing elements.
  5. 5. uninterruptible power system according to claim 1, it is characterised in that also including drive signal generator；It is described Drive signal generator is connected between the fixing end of the mode selector switch and the control terminal of the current transformer；The driving Signal generator is used to generate drive signal according to the cutting-in control signal or the off-network control signal, with to the change Stream device is controlled.
  6. 6. uninterruptible power system according to claim 1, it is characterised in that the cutting-in control circuit includes connecting successively The harmonic and reactive currents extraction circuit and current loop control circuit connect；
    The harmonic and reactive currents extraction circuit includes the 5th three-phase static coordinate system to two cordic phase rotators being sequentially connected with It is conversion module, the 3rd low pass filter, the 3rd liang of cordic phase rotator to three-phase static coordinate system conversion module and the one or three It is added musical instruments used in a Buddhist or Taoist mass；The input of 5th three phase static coordinate to the two-phase rotating coordinate system conversion module is connected to the public company The civil power side of contact, and the input also with the first three-phase adder is connected；The 5th three phase static coordinate is to two-phase Rotating coordinate system conversion module is used to be converted to three-phase mains electric current d axles DC quantity and q axles with low-frequency ripple The 3rd low pass filter is sent into after DC quantity and is filtered processing respectively；The 3rd liang of cordic phase rotator is to three phase static Coordinate system transformation module is used to the d axles DC quantity after processing and q axle DC quantities being converted into three phase network current first harmonics component；Institute State the first three-phase adder be used for by the harmonic and reactive currents obtained three phase network current first harmonics component of extraction circuit with it is described Three-phase mains electric current obtains the harmonics and reactive compensation command signal of three-phase mains electric current after being subtracted each other.
  7. 7. uninterruptible power system according to claim 6, it is characterised in that the electric current loop control of the cutting-in control circuit Circuit processed includes the second three-phase adder and the first current loop controller being sequentially connected with；The input of the second three-phase adder The output end with the first three-phase adder, the output end of current transformer are connected respectively at end；First current loop controller Output end and the grid-connected contact portion of the mode selector switch；The second three-phase adder is used for three-phase mains electricity The harmonics and reactive compensation command signal of stream obtains three-phase error signal after being subtracted each other with the output current feedback signal；Institute The first current loop controller is stated then to be used to carry out closed-loop control according to the three-phase error signal and generate three-phase grid control letter Number.
  8. 8. uninterruptible power system according to claim 1, it is characterised in that the outer voltage circuit includes mutually string The Voltage loop adder and voltage ring controller of connection；The first input end of the Voltage loop adder and the output of the current transformer End connection；Second input of the Voltage loop adder is used to receive the Voltage loop given voltage value；The Voltage loop adds Musical instruments used in a Buddhist or Taoist mass is used to be subtracted each other to obtain voltage error signal by the Voltage loop given voltage value and the output voltage feedback signal； The voltage ring controller is used to carry out closed-loop control according to the error signal and generates the current inner loop Setting signal；
    The current inner loop circuit includes the electric current loop adder and the second current loop controller being sequentially connected with；The electric current loop adds The first input end of musical instruments used in a Buddhist or Taoist mass is connected with the output end of the voltage ring controller；Second input of the electric current loop adder with The output end connection of the load-side current harmonics suppression circuit；3rd input of the electric current loop adder and the unsteady flow The output end connection of device；The output end of second current loop controller and the off-network contact portion of the mode selector switch； The second electric current loop adder is used to be subtracted each other the current inner loop Setting signal and the output current feedback signal Afterwards, it is added to obtain current error signal with the load-side current harmonics compensating instruction signal；Second current loop controller For carrying out closed-loop control according to the current error signal and generating the off-network control signal.
  9. 9. uninterruptible power system according to claim 8, it is characterised in that the outer voltage circuit also includes the 6th Three phase static coordinate is to two-phase rotating coordinate system conversion module；The Voltage loop adder includes Voltage loop d axles adder and electricity Pressure ring q axle adders；The voltage ring controller includes Voltage loop d axis controllers and Voltage loop q axis controllers；Described 6th 3 Phase static coordinate is connected to the input of two-phase rotating coordinate system conversion module with the output end of the current transformer, and the described 6th 3 Phase static coordinate to two-phase rotating coordinate system conversion module output end respectively with the Voltage loop d axles adder, Voltage loop q axles Adder connects；
    The current inner loop circuit also includes the 7th three phase static coordinate to two-phase rotating coordinate system conversion module and the 4th two-phase Rotational coordinates is to three-phase static coordinate system conversion module；The electric current loop adder includes electric current loop d axles adder and electric current loop q Axle adder；Second current loop controller includes electric current loop d axis controllers and electric current loop q axis controllers；Described 7th 3 Phase static coordinate is connected to the input of two-phase rotating coordinate system conversion module with the output end of the current transformer；Described 7th 3 Phase static coordinate to two-phase rotating coordinate system conversion module output end respectively with the electric current loop d axles adder, the electric current Ring q axles adder connects；The 4th liang of cordic phase rotator to three-phase static coordinate system conversion module input respectively with institute State the output end connection of electric current loop d axis controllers, electric current loop q axis controllers, the 4th liang of cordic phase rotator to three phase static The output end of the coordinate system transformation module then off-network contact portion with the mode selector switch.
  10. 10. uninterruptible power system according to claim 1, it is characterised in that the current transformer is two way convertor；Institute State control circuit be additionally operable to the voltage of the energy storage device either residual capacity carry out monitoring and output voltage values in real time or Remaining capacity value；
    The uninterruptible power system also includes comparison circuit；The comparison circuit respectively with the control circuit, described two-way Current transformer connects；The comparison circuit is used to judge whether the magnitude of voltage or the remaining capacity value are low in grid-connect mode In preset value, and charging signals are exported when the magnitude of voltage or the remaining capacity value are less than preset value；The current transformer Switch to rectification state by inverter mode according to the charging signals to charge to the energy storage device.
CN201610872568.1A 2016-09-29 2016-09-29 Uninterruptible power system Pending CN107887968A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110007743A (en) * 2019-04-14 2019-07-12 北京中大科慧科技发展有限公司 A kind of uninterruptible power supply
EP4170846A3 (en) * 2021-10-20 2023-05-03 Huawei Digital Power Technologies Co., Ltd. Power supply system, power supply method, control apparatus, and computer storage medium
CN116526658A (en) * 2023-07-03 2023-08-01 广州市锦路电气设备有限公司 UPS uninterrupted power source control management system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105633959A (en) * 2016-03-04 2016-06-01 易事特集团股份有限公司 Uninterruptible power supply and control method thereof
CN205489525U (en) * 2016-03-04 2016-08-17 易事特集团股份有限公司 Uninterruptible power supply system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105633959A (en) * 2016-03-04 2016-06-01 易事特集团股份有限公司 Uninterruptible power supply and control method thereof
CN205489525U (en) * 2016-03-04 2016-08-17 易事特集团股份有限公司 Uninterruptible power supply system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110007743A (en) * 2019-04-14 2019-07-12 北京中大科慧科技发展有限公司 A kind of uninterruptible power supply
EP4170846A3 (en) * 2021-10-20 2023-05-03 Huawei Digital Power Technologies Co., Ltd. Power supply system, power supply method, control apparatus, and computer storage medium
CN116526658A (en) * 2023-07-03 2023-08-01 广州市锦路电气设备有限公司 UPS uninterrupted power source control management system
CN116526658B (en) * 2023-07-03 2023-10-24 广州市锦路电气设备有限公司 UPS uninterrupted power source control management system

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Application publication date: 20180406