CN105633959B - Uninterruptible power system and its control method - Google Patents
Uninterruptible power system and its control method Download PDFInfo
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- CN105633959B CN105633959B CN201610126000.5A CN201610126000A CN105633959B CN 105633959 B CN105633959 B CN 105633959B CN 201610126000 A CN201610126000 A CN 201610126000A CN 105633959 B CN105633959 B CN 105633959B
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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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
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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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- 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
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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
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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
- 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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- 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
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- 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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- Business, Economics & Management (AREA)
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Abstract
A kind of uninterruptible power system, including energy storage battery；Observation circuit；Controllable switch；Cutting-in control circuit, including harmonic and reactive currents extract circuit and current loop control circuit；Off-network control circuit, including outer voltage circuit and current inner loop circuit；Mode selector switch and current transformer.For above-mentioned uninterruptible power system when grid-connected, cutting-in control circuit according to the harmonic wave and reactive component extraction harmonics and reactive compensation command signal in alternating current and carries out idle and harmonic compensation by closed-loop current control, reduces electric energy loss.Off-network control circuit is not involved in control in grid-connect mode, but still in operating status, can generate off-network according to Voltage loop given voltage value, output voltage feedback signal and output current feedback signal and control signal.When system by it is grid-connected be switched to off-network mode when, current transformer according to off-network control signal output is controlled, realize grid-connected/off-network mode seamless switching.The invention further relates to a kind of control methods of uninterruptible power system.
Description
Technical field
The present invention relates to power supply technical fields, more particularly to a kind of uninterruptible power system and its control method.
Background technique
With the rapid growth of data center power sources load in recent years, energy efficiency indexes require higher and higher.For being applied to
The uninterruptible power system (UPS) of high-density data center will not only power for information technoloy equipment, also guarantee the sky of information technoloy equipment operation
The power supply of the ancillary equipments such as tune, power supply requirement can continue to increase.Since the densification of data center is a kind of inevitable trend, because
This proposes completely new requirement to for its UPS for providing electric power safeguard.In traditional data center's power supply mode, base is generally used
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 under environment in forceful electric power net
It is lost larger, operating cost is higher, also, traditional UPS cannot effectively be improved in grid power quality difference, therefore
It is not able to satisfy the demand of data center's high quality power supply.
Summary of the invention
Based on this, it is necessary to it is smaller and can be realized and improved not to grid power quality to provide a kind of electric energy loss
Uninterruptible power system and its control method.
A kind of uninterruptible power system, including energy storage battery, further includes: observation circuit, for whether just to monitor alternating current
Often, and when alternating current is normal the first monitoring signals are exported, export the second monitoring signals when electrical anomaly in city；Controllable switch, connection
It is connect between alternating current and points of common connection and with the observation circuit；Control of the controllable switch in first monitoring signals
The lower conducting of system, so that the uninterruptible power system enters grid-connect mode；The controllable switch is in second monitoring signals
Control is lower to be disconnected, so that the uninterruptible power system enters off-network mode；Cutting-in control circuit, including harmonic and reactive currents
Extract circuit and current loop control circuit；The harmonic and reactive currents extract the circuit alternating current with the points of common connection respectively
Side, the current loop control circuit connection；The current loop control circuit is also connect with the output end of current transformer, to receive unsteady flow
The output current feedback signal of device；The harmonic and reactive currents extract circuit and are used for according to the harmonic wave of mains current and idle point
Amount extracts harmonics and reactive compensation command signal；The current loop control circuit is used to be instructed according to the harmonics and reactive compensation
Signal, the output current feedback signal generate cutting-in control signal；Off-network control circuit, including outer voltage circuit and electric current
Interior loop circuit；The first input end of the outer voltage circuit and the output end of current transformer connect, to receive the output of current transformer
Voltage feedback signal；Second input terminal of the outer voltage circuit is for receiving Voltage loop given voltage value；Outside the voltage
The output end of loop circuit is connect with the first input end of the current inner loop circuit；Second input terminal of the current inner loop circuit
It is connect with the output end of the current transformer, to receive the output current feedback signal of the current transformer；The outer voltage circuit
For generating the given letter of current inner loop according to the output voltage feedback signal of the Voltage loop given voltage value and the current transformer
Number；The current inner loop circuit is used to generate off-network according to the current inner loop Setting signal and the output current feedback signal
Control signal；Mode selector switch；The fixing end of the mode selector switch is connect with the control terminal of the current transformer；The mould
First contact of formula switching switch is connect with the output end of the cutting-in control circuit；Second contact of the mode selector switch
It is connect with the output end of the off-network control circuit；The mode selector switch is used under the control of first monitoring signals
The first contact is connected, connects the second contact under the control of second monitoring signals；And current transformer, the current transformer connection
Between the energy storage battery and the points of common connection；The current transformer is used for according to the cutting-in control signal or institute
Off-network control signal is stated to control output voltage or output electric current.
It in one of the embodiments, further include 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
Network control signal or off-network control signal generate driving signal, to control the current transformer.
It includes that sequentially connected first three-phase is quiet that the harmonic and reactive currents, which extract circuit, in one of the embodiments,
Only coordinate turns to two-phase rotating coordinate system conversion module, low-pass filter, first liang of cordic phase rotator to three-phase static coordinate system
Change the mold block and the first three-phase adder；Input terminal of the first three phase static coordinate to two-phase rotating coordinate system conversion module
It is connected to the alternating current side of the points of common connection, and is also connect with the input terminal of the first three-phase adder；Described 1st
Phase static coordinate is to two-phase rotating coordinate system conversion module for being converted to three-phase mains electric current with low-frequency ripple
D axis DC quantity and q axis DC quantity after be sent into the low-pass filter and be filtered respectively；The first two-phase rotation is sat
It is electric for treated d axis DC quantity and q axis DC quantity to be converted into three phase network to mark three-phase static coordinate system conversion module
Flow fundametal compoment；The first three-phase adder is used for the three phase network electric current base for obtaining harmonic and reactive currents extraction circuit
Wave component and the three-phase mains electric current obtain the harmonics and reactive compensation command signal of three-phase mains electric current after being subtracted each other；Institute
The current loop control circuit for stating cutting-in control circuit includes sequentially connected second three-phase adder and current loop controller；It is described
The input terminal of second three-phase adder is connect with the output end of the output end of the first three-phase adder, current transformer respectively；Institute
The output end for stating current loop controller is connect with the first contact of the mode selector switch；The second three-phase adder is used for
After the harmonics and reactive compensation command signal of the three-phase mains electric current and three-phase output current feedback signal are subtracted each other
To three-phase error signal；The current loop controller is then used to carry out closed-loop control according to the three-phase error signal and generates three
Phase cutting-in control signal.
The outer voltage circuit includes the Voltage loop adder and Voltage loop being serially connected in one of the embodiments,
Controller；The first input end of the Voltage loop adder is connect with the output end of the current transformer, for receiving output voltage
Feedback signal；Second input terminal of the Voltage loop adder is for receiving the Voltage loop given voltage value；The Voltage loop
Adder is used to be subtracted each other the Voltage loop given voltage value and the output voltage feedback signal to obtain voltage error letter
Number；The voltage ring controller is used to carry out closed-loop control according to the error signal and generates current inner loop Setting signal；Institute
Stating current inner loop circuit includes sequentially connected electric current loop adder and current loop controller；The second of the electric current loop adder
Input terminal is connect with the output end of the current transformer, to receive output current feedback signal；The first of the electric current loop adder
Input terminal is connect with the output end of the voltage ring controller；The output end of the current loop controller is opened with the pattern switching
The the second contact connection closed；The electric current loop adder is used for the current inner loop Setting signal and the output current feedback
Signal is subtracted each other to obtain current error signal；The current loop controller is used to carry out closed loop according to the current error signal
It controls and generates off-network control signal.
The outer voltage circuit further includes that the second three phase static coordinate is sat to two-phase rotation in one of the embodiments,
Mark system conversion module；The Voltage loop adder includes Voltage loop d axis adder and Voltage loop q axis adder；The Voltage loop
Controller includes Voltage loop d axis controller and Voltage loop q axis controller；The second three phase static coordinate is to two cordic phase rotators
It is that the input terminal of conversion module is connect with the output end of the current transformer, the second three phase static coordinate to two cordic phase rotators
It is that the output end of conversion module is connect with the Voltage loop d axis adder, Voltage loop q axis adder respectively；The current inner loop
Circuit further includes that third three phase static coordinate is quiet to three-phase to two-phase rotating coordinate system conversion module and second liang of cordic phase rotator
Only coordinate system conversion module；The electric current loop adder includes electric current loop d axis adder and electric current loop q axis adder；The electricity
Flowing ring controller includes electric current loop d axis controller and electric current loop q axis controller；The third three phase static coordinate is rotated to two-phase
The input terminal of coordinate system conversion module is connect with the output end of the current transformer；The third three phase static coordinate is rotated to two-phase
The output end of coordinate system conversion module is connect with the electric current loop d axis adder, the electric current loop q axis adder respectively；It is described
Second liang of cordic phase rotator to three-phase static coordinate system conversion module input terminal respectively with the electric current loop d axis controller, electricity
Flow the output end connection of ring q axis controller, the output of second liang of cordic phase rotator to three-phase static coordinate system conversion module
End is then connect with the second contact of the mode selector switch.
The voltage ring controller and the current loop controller are pi regulator in one of the embodiments,.
The current transformer is bidirectional converter in one of the embodiments,；The observation circuit is also used to the storage
The voltage or residual capacity of energy storage device carry out real-time monitoring and output voltage values or remaining capacity value；The uninterrupted electricity
Source system further includes comparison circuit；The comparison circuit is connect with the observation circuit, the bidirectional converter respectively；The ratio
It is used to judge whether the voltage value or the remaining capacity value are lower than preset value in grid-connect mode compared with circuit, and described
Voltage value or the remaining capacity value export charging signals when being lower than preset value；The current transformer according to the charging signals by
Inverter mode switchs to rectification state and charges to the energy storage battery.
It in one of the embodiments, further include reactor；The input terminal of the reactor is defeated with the controllable switch
Outlet connection；The output end of the reactor accesses points of common connection.
It in one of the embodiments, further include by-pass switch；The by-pass switch is connected with alternating current, load respectively；Institute
By-pass switch is stated directly to be powered to the load for being connected when the uninterruptible power system needs to repair by alternating current.
A kind of control method of uninterruptible power system, for controlling the uninterruptible power supply as described in aforementioned any embodiment
System switches between grid-connect mode and off-network mode, and the control method includes: whether monitoring alternating current is normal；If alternating current
It is normal then export the control controllable switch conducting of the first monitoring signals so that the uninterruptible power system and alternating current be incorporated into the power networks into
Enter grid-connect mode；The first contact of control mode switch switch connection；It controls the harmonic and reactive currents and extracts circuit according to city
The harmonic wave and reactive component of electric current extract harmonics and reactive compensation command signal；The current loop control circuit is controlled according to institute
State harmonics and reactive compensation command signal, the output current feedback signal generates cutting-in control signal to the current transformer
Output electric current is controlled；It controls off-network control circuit work, but and is not involved in the control process of cutting-in control circuit, institute
It is given according to the Voltage loop given voltage value and output voltage feedback signal generation current inner loop to state outer voltage circuit
Signal；The current inner loop circuit generates off-network control according to the current inner loop Setting signal and the output current feedback signal
Signal processed；It exports the second monitoring signals control controllable switch if city's electrical anomaly to disconnect, so that the uninterruptible power system is only
It is vertical to power to the load, into off-network mode；Control mode switch switch is connected to the second contact from the first contact；According to the off-network
Control signal controls the output voltage of the current transformer.
Above-mentioned uninterruptible power system has grid-connected and two kinds of operating modes of off-network.When alternating current is normal, cutting-in control electricity
Road is according to the harmonic wave and reactive component extraction harmonics and reactive compensation command signal in mains current and passes through the electricity to current transformer
It flows closed-loop control and harmonics and reactive compensation electric current is injected into power grid to carry out idle and harmonic compensation, thus to power grid electric energy matter
Amount is improved, and electric energy loss, energy efficiency index with higher are reduced.Also, off-network control circuit in grid-connect mode not
Control is participated in, but still it is in operating status, it can be according to Voltage loop given voltage value, output voltage feedback signal and output electric current
Feedback signal generates off-network and controls signal.When uninterruptible power system switches to off-network mode by grid-connect mode, current transformer root
It is exported according to the off-network control signal of off-network control circuit output and is controlled, to realize the seamless of grid-connected/off-network mode
Switching.
Detailed description of the invention
Fig. 1 is the circuit block diagram of the uninterruptible power system in an embodiment；
Fig. 2 is the circuit diagram of the uninterruptible power system in Fig. 1；
The schematic diagram that PCC point A phase power quality is improved when Fig. 3 is incorporated into the power networks for uninterruptible power system；
Fig. 4 be uninterruptible power system it is grid-connected to off-network seamless switching when A phase effect schematic diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
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, which includes that energy storage stores
Battery 110, observation circuit (not shown), controllable switch 120, cutting-in control circuit 130, off-network control circuit 140, mode are cut
Change switch 150 and current transformer 160.
Energy storage battery 110 is for storing electric energy, so as to export electric energy outward so that load is worked normally.Storage
Energy storage device 110 can be realized using the common battery types of uninterruptible power system.
Observation circuit is for being monitored alternating current, to judge whether alternating current is normal according to monitoring situation.Specifically, it supervises
Slowdown monitoring circuit is monitored judge whether alternating current is normal by the three-phase voltage to alternating current.In the present embodiment, alternating current is normally
Refer to alternating current voltage be in stable state, will not occur change dramatically (voltage has biggish promotion or decline in the short time) and
It can normally export and be powered to load；City's electrical anomaly then refers to that the voltage of alternating current plays pendulum or interrupts (i.e. not
Powering load can normally be exported).Observation circuit exports the first monitoring signals when monitoring that alternating current is normal, and in city's electrical anomaly
When export the second monitoring signals.
Controllable switch 120 is connected between alternating current and load, for controlling the connection between alternating current and load.Specifically,
Controllable switch 120 includes input, output end and control terminal.The input terminal of controllable switch 120 is electrically connected with city, and output end is then
It is connected by points of common connection PCC and load.The control terminal of controllable switch 120 is then connect with observation circuit.Controllable switch 120 is used
It is carried out accordingly in the first monitoring signals and the second monitoring signals that receive observation circuit output, and according to the monitoring signals received
Operation.The conducting when receiving the first monitoring signals of controllable switch 120 so that alternating current and load connect, from alternating current to
Load supplying, uninterruptible power system are incorporated into the power networks, into grid-connect mode.Control of the controllable switch 120 in the second monitoring signals
Lower disconnection avoids the harm caused by load of city's electrical anomaly to disconnect the connection between alternating current and load.Uninterrupted electricity at this time
Source system independently powers to the load, into off-network mode.
Cutting-in control circuit 130 is controlled for generating cutting-in control signal with the work to grid-connected current transformer in the process
System.Specifically, cutting-in control circuit 130 includes that harmonic and reactive currents extract circuit 132 and current loop control circuit 134.It is humorous
The input terminal that wave and reactive current extract circuit 132 is connected to the alternating current side of points of common connection PCC, output end then with electric current loop control
The input terminal of circuit 134 processed connects.The input terminal of current loop control circuit 134 is also connect with the output end of current transformer 160, to connect
Receive the output current feedback signal of current transformer 160.The of the output end of current loop control circuit 134 and mode selector switch 150
The connection of one contact.Harmonic and reactive currents extract circuit 132 be used for according in mains current harmonic wave and reactive component extract it is humorous
Wave and reactive compensation command signal are simultaneously sent in current loop control circuit 134.Current loop control circuit 134 is according to harmonic wave and nothing
The output current feedback signal of function compensating instruction signal and current transformer 160 generates cutting-in control signal.
Off-network control circuit 140 is controlled for generating off-network control signal with the work to current transformer during off-network
System.Off-network control circuit 140 includes outer voltage circuit 142 and current inner loop circuit 144.Wherein, outer voltage circuit 142
First input end is connect with the output end of current transformer 160, to receive the output voltage feedback signal of current transformer 160.Outer voltage
Second input terminal of circuit 160 is for receiving Voltage loop given voltage value.In the present embodiment, Voltage loop given voltage value is
The voltage provided when alternating current normally powers to the load.It in other examples, can also be according to alternating current in practical grid-connect mode
Supply voltage be configured.The output end of outer voltage circuit 142 is connect with the first input end of current inner loop circuit 144.
Second input terminal of current inner loop circuit 144 is then connect with the output end of current transformer 160, to receive the output electricity of current transformer 160
Flow feedback signal.The output end of current inner loop circuit 144 is connect with the second contact of mode selector switch 150.Outer voltage electricity
Road 142 is used to generate current inner loop Setting signal according to Voltage loop given voltage value and output voltage feedback signal.Current inner loop
Circuit 144 then generates off-network according to the output current feedback signal of current inner loop Setting signal and current transformer 160 and controls signal.?
In the present embodiment, cutting-in control circuit 130 and off-network control circuit 140 are located always in uninterruptible power system operational process
In operating status, but it is whether that participating in control then needs to be controlled according to the state of mode selector switch 150.
The fixing end of mode selector switch 150 is connect with the control terminal of current transformer 160, the control of mode selector switch 150
End is then connect with observation circuit.Mode selector switch 150 connects under the control of the first monitoring signals (namely grid-connect mode)
One contact, to exporting the cutting-in control signal that cutting-in control circuit 130 generates to the control terminal of current transformer 160.Current transformer
160 export harmonics and reactive compensation electric current actually required under the control of the cutting-in control signal is injected into power grid, and original
Harmonic and reactive currents in power network current offset, to realize the effect of power network current sine, unity power factor, subtract
Small electric energy loss, improves energy efficiency index.Mode selector switch 150 is turned under the control of the second monitoring signals by the first contact
It is connected to the second contact.Since off-network control circuit 140 is also at operating status in grid-connect mode, can be completed in switching
When will generate off-network control signal export to current transformer 160.Current transformer 160 controls signal according to the off-network and carries out to output
Control, to meet the power demands of load.Since the off-network that before and after pattern switching, off-network control circuit 140 is exported controls letter
Number identical, not big mutation reduces switching caused by when uninterruptible power system is switched to off-network mode as grid-connect mode
Grid-connected/off-network mode seamless switching is realized in impact.
Above-mentioned uninterruptible power system has grid-connected and two kinds of operating modes of off-network.When alternating current is normal, cutting-in control electricity
Road 130 is according to the harmonic wave and reactive component extraction harmonics and reactive compensation command signal in mains current and by current transformer
Harmonics and reactive compensation electric current is injected into power grid to carry out idle and harmonic compensation, thus to PCC by 160 closed-loop current control
Point power quality is improved, and electric energy loss, energy efficiency index with higher are reduced.Also, off-network control circuit 140 is simultaneously
Control is not involved in when net mode, but still in operating status, can according to Voltage loop given voltage value, output voltage feedback signal with
And output current feedback signal generates off-network and controls signal.When uninterruptible power system switches to off-network mode by grid-connect mode
When, the off-network control signal that current transformer 160 is exported according to off-network control circuit 140, which exports it, to be controlled.Before pattern switching
Afterwards, the off-network control signal that off-network control circuit 140 exports is identical, to realize grid-connected/off-network mould of uninterruptible power system
Formula seamless switching.
In the present embodiment, above-mentioned uninterruptible power system further include drive signal generator 170, filter circuit 180,
Reactor 190 and by-pass switch (not shown).Drive signal generator 170 is connected to the fixation of mode selector switch 150
Between end and the control terminal of current transformer 160.Drive signal generator 170 is grid-connected for being transmitted according to mode selector switch 150
It controls signal or off-network control signal generates driving signal, to control current transformer 160.In the present embodiment, it drives
Signal generator 170 is SPWM signal generator, and current transformer 160 is PWM converter.
Filter circuit 180 is connected between the output end of current transformer 160 and points of common connection PCC.Filter circuit 180 is used
It is filtered in the output electric current to current transformer 160.Specifically, filter circuit 180 is LC filter circuit.
Reactor 190 is connected between controllable switch 120 and points of common connection PCC.Reactor 190 is used for alternating current and bears
Load is kept apart, it is ensured that the sineization of grid side electric current.By-pass switch is then connected between load and alternating current, in uninterrupted electricity
Conducting when source system needs to repair, to directly be powered to the load by alternating current, it is ensured that born when uninterruptible power system exception
Load still is able to work normally.
In the present embodiment, it includes sequentially connected first three phase static coordinate that harmonic and reactive currents, which extract circuit 132,
To two-phase rotating coordinate system conversion module (i.e. the first abc/dq conversion module) 1322, low-pass filter 1324, the rotation of the first two-phase
Turn coordinate to three-phase static coordinate system conversion module (i.e. the first dq/abc conversion module) 1326 and the first three-phase adder
1328.The input terminal of first abc/dq conversion module 1322 is connected to the alternating current side of points of common connection PCC, for receiving three-phase city
Electric current (igA、igB、igC).Input of the input terminal of first abc/dq conversion module 1322 also with the first three-phase adder 1328
End connection, thus by three-phase mains electric current (igA、igB、igC) be input in the first three-phase adder 1328.First abc/dq turns
Block 1322 is changed the mold for realizing abc three-phase static coordinate system to the conversion of dq two-phase rotating coordinate system, i.e., by three-phase mains electric current
(igA、igB、 igC) be converted to the d axis DC quantity I containing low-frequency ripplegdhWith q axis DC quantity IgqH, and be respectively fed to low pass filtered
In wave device 1324.Low-pass filter 1324 is respectively to the d axis DC quantity I of inputgdhWith q axis DC quantity IgqhBe filtered with
Obtain corresponding pure d axis DC quantity IgdWith q axis DC quantity Igq.The input terminal of first dq/abc conversion module 1326 with it is low
The output end of bandpass filter 1324 connects, and output end is then connect with the input terminal of the first three-phase adder 1328.First dq/
Abc conversion module 1326 is used for the d axis DC quantity I that will be inputtedgdWith q axis DC quantity IgqIt is converted into three phase network current first harmonics point
Measure (igAf、igBf、igCf).General three phase network electric current can be analyzed to fundamental current, harmonic and reactive currents two parts, it may be assumed that
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), it may be assumed that
igAf- igA=igAf(igAf+igAh)=- igAh=igAhref。
igBf- igB=igBf(igBf+igBh)=- igBh=igBhref。
igCf- igC=igCf(igCf+igCh)=- igCh=igChref。
Current loop control circuit 134 includes sequentially connected second three-phase adder 1342 and current loop controller 1344.
Wherein, the input terminal of the second three-phase adder 1342 respectively with the output end and current transformer 160 of the first three-phase adder 1328
Output end connection.The output end of second three-phase adder 1342 is then connect with the input terminal of current loop controller 1344.Electric current
The output end of ring controller 1344 is connect with the first contact 1 of analog switching switch 150.Second three-phase adder 1342 is used for
Harmonics and reactive compensation command signal (the i that first three-phase adder 1328 is exportedgAhref、igBhref、igChref) and current transformer
Output current feedback signal (the i of 160 output endsA、iB、iC) subtracted each other after obtain error signal after be sent to current loop control
In device 1344.Current loop controller 1344 is used to carry out closed-loop control according to the error signal and generates three-phase grid control signal
(Varef1、 Vbref1、Vcref1).In the present embodiment, current loop controller 1344 is pi regulator.
Outer voltage circuit in off-network control circuit 140 includes that the second three phase static coordinate turns to two-phase rotating coordinate system
Change the mold block (i.e. the 2nd abc/dq conversion module) 310, Voltage loop adder and voltage ring controller.Wherein, Voltage loop addition
Device includes Voltage loop d axis adder 322 and Voltage loop q axis adder 324；Voltage ring controller equally includes Voltage loop d axis control
Device 332 and Voltage loop q axis controller 334 processed.The input terminal of 2nd abc/dq conversion module 310 and the output end of current transformer 160
Connection, output end are then connect with Voltage loop d axis adder 322, Voltage loop q axis adder 324 respectively.Voltage loop d axis addition
Device 322 is connect with Voltage loop d axis controller 332, and Voltage loop q axis adder 324 is then connect with Voltage loop q axis controller 334.The
Two abc/dq conversion modules 310 are used for the three-phase output voltage (u of 160 output end of current transformerA、uB、uC) be converted to d shaft voltage
Value of feedback UdWith q shaft voltage UqIt is respectively fed to afterwards first defeated to Voltage loop d axis adder 322 and Voltage loop q axis adder 324
Enter end.Second input terminal of Voltage loop d axis adder 322 is then used to receive Voltage loop d axis given voltage value Udref *.Voltage loop q
Second input terminal of axis adder 324 is then used to receive Voltage loop q axis given voltage value Uqref *.Voltage loop d axis adder 322
By the Voltage loop d axis given voltage value U of inputdref *With d shaft voltage value of feedback UdIt is sent into after obtaining error signal after being subtracted each other
Into Voltage loop d axis controller 332.Voltage loop d axis controller 332 is 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 axis adder 334 is similar with the working principle of Voltage loop q axis controller 332, no
Repeated explanation.
Current inner loop circuit in off-network control circuit 140 includes that third three phase static coordinate turns to two-phase rotating coordinate system
Change the mold block (i.e. the 3rd abc/dq conversion module) 340, electric current loop adder, current loop controller and second liang of cordic phase rotator
To three-phase static coordinate system conversion module (i.e. the 2nd dq/abc conversion module) 370.Wherein, electric current loop adder includes electric current loop
D axis adder 352 and electric current loop q axis adder 354, current loop controller equally include electric current loop d axis controller 362 and electric current
Ring q axis controller 364.The input terminal of 3rd abc/dq conversion module 340 is connect with the output end of current transformer 160, to receive three
Mutually output current feedback signal (iA、 iB、iC).The output end of 3rd abc/dq conversion module 340 respectively with electric current loop d axis addition
The second input terminal connection of the second input terminal, electric current loop q axis adder 354 of device 352.The first of electric current loop d adder 352 is defeated
Enter end then to connect with the output end of Voltage loop d axis controller 332, output end is then connect with electric current loop d axis controller 362.Electricity
Stream ring q axis adder 354 first input end connect with the output end of Voltage loop q axis controller 334, output end then with electric current
Ring q axis controller 364 connects.The output end of electric current loop d axis controller 362 and electric current loop q axis controller 364 is respectively with second
The input terminal of dq/abc conversion module 370 connects.The output end of 2nd dq/abc conversion module 370 then with mode selector switch
150 the second contact 2 connection.Wherein, the 3rd abc/dq conversion module 340 is used to the three-phase of current transformer 160 exporting electric current
(iA、iB、iC) be converted to d shaft current IdWith q shaft current IqAnd it is respectively fed to electric current loop d axis adder 352 and electric current loop q axis add
In musical instruments used in a Buddhist or Taoist mass 354.Electric current loop d axis adder 352 is by the d shaft current inner ring Setting signal I of inputd *With d shaft current IdAfter subtracting each other
To error signal and electric current loop d axis controller 362 is sent to generate d axis control signal udo.Likewise, electric current loop q axis controls
Device can also generate q axis control signal uqo.2nd dq/abc conversion module 370 controls signal u according to the d axis of inputdoAnd q axis
Control signal uqoIt generates three-phase off-network and controls signal (Varef2、Vbref2、Vcref2).In the present embodiment, current loop controller and electricity
Pressure ring controller is pi regulator.
The control method of above-mentioned uninterruptible power system is as follows:
After system start-up, observation circuit continues working, and whether monitoring alternating current is normal.
When alternating current is normal, observation circuit exports the first monitoring signals control controllable switch 120 and is connected, uninterruptible power supply system
System enters grid-connect mode.At this point, mode selector switch 150 is connected to the first contact 1, thus exported by cutting-in control circuit 130
Cutting-in control signal (Varef1、Vbref1、Vcref1) via drive signal generator 170 generate driving signal after to current transformer 160
Output controlled.Current transformer 160 exports harmonics and reactive compensation electric current actually required according to the driving signal received
And it is injected into power grid, and the harmonic and reactive currents in power network current offseted originally, to realize power network current sine, list
The effect of position power factor.The signal that PCC point A phase power quality is improved when Fig. 3 is incorporated into the power networks for uninterruptible power system
Figure.In t0Before moment, uninterruptible power system is not connected to the grid, by alternating current powering load.Contain when in load A phase current
When having harmonic wave, A phase power network current igAWave distortion is serious, while the advanced A phase current of A phase voltage at PCC point, illustrates A phase power grid
Electric current igAMiddle reactive component is also bigger, needs to compensate.In t0Moment, ups power system investment are connected to the grid, to A phase power grid
It harmonic wave in electric current and idle compensates.Because power network current can be analyzed to fundamental current and harmonic wave adds reactive current two
Point, i.e. igA=igAf+igAh.It UPS output harmonic wave and harmonic wave in reactive compensation Current on Grid electric current and idle compensates.It mends
After repaying, A phase power network current waveform becomes pure sinusoid, and A phase current is consistent with voltage-phase, eliminates idle, only exists active point
Amount, therefore the function that power quality improves is completed well, reduce electric energy loss.
In grid-connect mode, observation circuit is also monitored the voltage or remaining capacity of energy storage battery 110 and defeated
Voltage value and residual electric quantity out.Uninterruptible power system then further includes comparison circuit (not shown).Comparison circuit is wherein
One input terminal is connect with observation circuit, and another input terminal is then used to receive preset value, the output end then control with current transformer 160
End connection.Comparison circuit judges battery voltage value for input voltage value or remaining capacity value to be compared with preset value
Or whether remaining capacity value is lower than preset value, if it is exports charging signals (for level signal).Current transformer 160 is filled at this
Rectification state is converted to by inverter mode under the control of electric signal, is filled after being rectified to alternating current to energy storage battery 110
Electricity.After system start-up, observation circuit and comparison circuit are constantly in working condition, to realize grid-connected in the process to energy storage
The control that battery 110 charges.Off-network control circuit is also at operating status, but and is not involved in control in grid-connect mode
Process.
In grid-connect mode, uninterruptible power system is incorporated into the power networks with bulk power grid, but observation circuit can be to alternating current simultaneously
Three-phase voltage carries out real-time monitoring.Once monitoring city's electrical anomaly or interruption, controllable switch 120 will be disconnected, uninterruptible power supply
System enters off-network mode.Mode selector switch 150 is then forwarded to the second contact 2 by the first contact 1.Off-network control circuit 140
The off-network of generation is controlled into signal (Varef2、Vbref2、Vcref2) by the second contact 2 be sent in drive signal generator 170 with
Generate driving signal.Current transformer 160 exports it under the control of the driving signal and controls, thus powering load.Fig. 4
For uninterruptible power system it is grid-connected to off-network seamless switching when A phase effect schematic diagram.In t0Before moment, uninterruptible power supply system
System is incorporated into the power networks, and supplies electricity to important load power supply by city, while current transformer takes from alternating current and supplies electricity to energy storage battery charging, 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 is switched to off-network mode, mains current i from grid-connect modegAIt is zero, current transformer 160 is switched to inversion work from charged state
State, by energy storage battery 110 through 160 powering load of current transformer, load current i at this timeLAIt is equal to UPS output electric current
iA, i.e. iLA=iA。
When line voltage restores normal, controllable switch 120 will be reclosed, and supply electricity to important load power supply by city, and
According to the harmonic wave and reactive component progress harmonics and reactive compensation in mains current, improve the power quality of PCC point.
Above-mentioned uninterruptible power system has two kinds of operating modes of grid-connect mode and off-grid operation.It is incorporated to when alternating current is normal
Power grid, harmonic wave and reactive component in mains current carry out harmonics and reactive compensation, improve the power quality of PCC point alternating current, together
When energy storage battery 110 voltage or capacity be lower than preset value when give energy storage battery 110 charge.It is seamless when electrical anomaly in city
Switch to off-network mode, the continued power of proof load.Above-mentioned uninterruptible power system consumes energy at least in forceful electric power net, energy
Imitate highest, maintenance cost is extremely low, and the service life of battery is longer than traditional UPS, and whole system may be mounted at open air, for
Save the valuable interior space in family.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies 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, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of uninterruptible power system, including energy storage battery, which is characterized in that further include:
Observation circuit, it is whether normal for monitoring alternating current, and the first monitoring signals are exported when alternating current is normal, in city when electrical anomaly
Export the second monitoring signals；
Controllable switch is connected between alternating current and points of common connection and connect with the observation circuit；The controllable switch is in institute
It states and is connected under the control of the first monitoring signals, so that the uninterruptible power system enters grid-connect mode；The controllable switch exists
It is disconnected under the control of second monitoring signals, so that the uninterruptible power system enters off-network mode；
Cutting-in control circuit, including harmonic and reactive currents extract circuit and current loop control circuit；The harmonic wave and idle electricity
Stream extract circuit respectively with the alternating current side of the points of common connection, the current loop control circuit connection；The current loop control
Circuit is also connect with the output end of current transformer, to receive the output current feedback signal of current transformer；The harmonic and reactive currents
Circuit is extracted to be used to extract harmonics and reactive compensation command signal according to the harmonic wave and reactive component of mains current；The electric current loop
Control circuit is used to generate cutting-in control letter according to the harmonics and reactive compensation command signal, the output current feedback signal
Number；
It includes that sequentially connected first three phase static coordinate arrives that the harmonic and reactive currents of the cutting-in control circuit, which extract circuit,
Two-phase rotating coordinate system conversion module, low-pass filter, first liang of cordic phase rotator to three-phase static coordinate system conversion module with
And the first three-phase adder；The input terminal of first three phase static coordinate to the two-phase rotating coordinate system conversion module is connected to institute
The alternating current side of points of common connection is stated, and is also connect with the input terminal of the first three-phase adder；First three phase static is sat
Two-phase rotating coordinate system conversion module is marked for being converted to the d axis direct current with low-frequency ripple to three-phase mains electric current
The low-pass filter is sent into after amount and q axis DC quantity to be filtered respectively；First liang of cordic phase rotator is to three-phase
Rest frame conversion module is used to treated d axis DC quantity and q axis DC quantity being converted into three phase network current first harmonics point
Amount；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
The three-phase mains electric current obtains the harmonics and reactive compensation command signal of three-phase mains electric current after being subtracted each other；
Off-network control circuit, including outer voltage circuit and current inner loop circuit；The first input end of the outer voltage circuit
It is connect with the output end of current transformer, to receive the output voltage feedback signal of current transformer；The second of the outer voltage circuit is defeated
Enter end for receiving Voltage loop given voltage value；The first of the output end of the outer voltage circuit and the current inner loop circuit
Input terminal connection；Second input terminal of the current inner loop circuit is connect with the output end of the current transformer, to receive the change
Flow the output current feedback signal of device；The outer voltage circuit is used for according to the Voltage loop given voltage value and the unsteady flow
The output voltage feedback signal of device generates current inner loop Setting signal；The current inner loop circuit is used for according to the current inner loop
Setting signal and the output current feedback signal generate off-network and control signal；
Mode selector switch；The fixing end of the mode selector switch is connect with the control terminal of the current transformer；The mode is cut
The first contact for changing switch is connect with the output end of the cutting-in control circuit；Second contact of the mode selector switch and institute
State the output end connection of off-network control circuit；The mode selector switch under the control of first monitoring signals for connecting
The second contact is connected under the control of second monitoring signals in first contact；And
Current transformer, the current transformer are connected between the energy storage battery and the points of common connection；The current transformer is used for
Output voltage or output electric current are controlled according to the cutting-in control signal or off-network control signal.
2. uninterruptible power system according to claim 1, which is characterized in that further include 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 driving signal according to the cutting-in control signal or off-network control signal, to the change
Stream device is controlled.
3. uninterruptible power system according to claim 1, which is characterized in that the electric current loop control of the cutting-in control circuit
Circuit processed includes sequentially connected second three-phase adder and current loop controller；The input terminal of the second three-phase adder point
It is not connect with the output end of the output end of the first three-phase adder, current transformer；The output end of the current loop controller with
First contact of the mode selector switch connects；The second three-phase adder is used for the harmonic wave of the three-phase mains electric current
Three-phase error signal is obtained after being subtracted each other with reactive compensation command signal and three-phase output current feedback signal；The electric current loop
Controller is then used to carry out closed-loop control according to the three-phase error signal and generates three-phase grid control signal.
4. uninterruptible power system according to claim 1, which is characterized in that the outer voltage circuit includes mutually going here and there
The Voltage loop adder and voltage ring controller of connection；The output of the first input end and the current transformer of the Voltage loop adder
End connection, for receiving output voltage feedback signal；Second input terminal of the Voltage loop adder is for receiving the voltage
Ring given voltage value；The Voltage loop adder is used for the Voltage loop given voltage value and the output voltage feedback signal
Subtracted each other to obtain voltage error signal；The voltage ring controller is used to carry out closed-loop control and life according to the error signal
At current inner loop Setting signal；
The current inner loop circuit includes sequentially connected electric current loop adder and current loop controller；The electric current loop adder
The second input terminal connect with the output end of the current transformer, to receive output current feedback signal；The electric current loop adder
First input end connect with the output end of the voltage ring controller；The output end of the current loop controller and the mode
The second contact connection of switching switch；The electric current loop adder is used for the current inner loop Setting signal and output electricity
Stream feedback signal is subtracted each other to obtain current error signal；The current loop controller be used for according to the current error signal into
Row closed-loop control simultaneously generates off-network control signal.
5. uninterruptible power system according to claim 4, which is characterized in that the outer voltage circuit further includes second
Three phase static coordinate is to two-phase rotating coordinate system conversion module；The Voltage loop adder includes Voltage loop d axis adder and electricity
Pressure ring q axis adder；The voltage ring controller includes Voltage loop d axis controller and Voltage loop q axis controller；Described 2nd 3
The input terminal of phase static coordinate to two-phase rotating coordinate system conversion module is connect with the output end of the current transformer, and the described 2nd 3
Phase static coordinate to two-phase rotating coordinate system conversion module output end respectively with the Voltage loop d axis adder, Voltage loop q axis
Adder connection；
The current inner loop circuit further includes third three phase static coordinate to two-phase rotating coordinate system conversion module and the second two-phase
Rotational coordinates is to three-phase static coordinate system conversion module；The electric current loop adder includes electric current loop d axis adder and electric current loop q
Axis adder；The current loop controller includes electric current loop d axis controller and electric current loop q axis controller；The third three-phase is quiet
Only the input terminal of coordinate to two-phase rotating coordinate system conversion module is connect with the output end of the current transformer；The third three-phase is quiet
Only coordinate to two-phase rotating coordinate system conversion module output end respectively with the electric current loop d axis adder, the electric current loop q axis
Adder connection；Second liang of cordic phase rotator to three-phase static coordinate system conversion module input terminal respectively with the electric current
The output end connection of ring d axis controller, electric current loop q axis controller, second liang of cordic phase rotator to three-phase static coordinate system
The output end of conversion module is then connect with the second contact of the mode selector switch.
6. uninterruptible power system according to claim 4, which is characterized in that the voltage ring controller and the electric current
Ring controller is pi regulator.
7. uninterruptible power system according to claim 1, which is characterized in that the current transformer is bidirectional converter；Institute
State observation circuit be also used to carry out real-time monitoring to the voltage or residual capacity of the energy storage battery and output voltage values or
Person's remaining capacity value；
The uninterruptible power system further includes comparison circuit；The comparison circuit respectively with the observation circuit, described two-way
Current transformer connection；The comparison circuit is for judging whether the voltage value or the remaining capacity value are low in grid-connect mode
Charging signals are exported in preset value, and when the voltage value or the remaining capacity value are lower than preset value；The current transformer
Switch to rectification state by inverter mode according to the charging signals to charge to the energy storage battery.
8. uninterruptible power system according to claim 1, which is characterized in that further include reactor；The reactor
Input terminal is connect with the output end of the controllable switch；The output end of the reactor accesses points of common connection.
9. uninterruptible power system according to claim 1, which is characterized in that further include by-pass switch；The bypass is opened
It closes and is connected respectively with alternating current, load；The by-pass switch is used for the conducting when the uninterruptible power system needs to repair
To directly be powered to the load by alternating current.
10. a kind of control method of uninterruptible power system, for controlling the uninterrupted electricity as described in claim 1~9 is any
Source system switches between grid-connect mode and off-network mode, which is characterized in that the control method includes:
Whether normal monitor alternating current；
If alternating current normally if export the first monitoring signals control controllable switch conducting so that the uninterruptible power system and alternating current
It is incorporated into the power networks and enters grid-connect mode；The first contact of control mode switch switch connection；The harmonic and reactive currents are controlled to extract
Circuit extracts harmonics and reactive compensation command signal according to the harmonic wave and reactive component of mains current；Control the current loop control
Circuit generates cutting-in control signal to institute according to the harmonics and reactive compensation command signal, the output current feedback signal
The output electric current for stating current transformer is controlled；The off-network control circuit work is controlled, but and is not involved in cutting-in control circuit
Control process, the outer voltage circuit generate electricity according to the Voltage loop given voltage value and the output voltage feedback signal
Flow inner ring Setting signal；The current inner loop circuit is according to the current inner loop Setting signal and the output current feedback signal
It generates off-network and controls signal；
The second monitoring signals control controllable switch is exported if city's electrical anomaly to disconnect so that the uninterruptible power system it is independent to
Load supplying, into off-network mode；Control mode switch switch is connected to the second contact from the first contact；It is controlled according to the off-network
Signal controls the output voltage of the current transformer.
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| CN201610126000.5A CN105633959B (en) | 2016-03-04 | 2016-03-04 | Uninterruptible power system and its control method |
| PCT/CN2016/101470 WO2017148150A1 (en) | 2016-03-04 | 2016-10-08 | Uninterruptible power system and control method thereof |
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| CN201610126000.5A CN105633959B (en) | 2016-03-04 | 2016-03-04 | Uninterruptible power system and its control method |
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| CN107887920A (en) * | 2016-09-29 | 2018-04-06 | 易事特集团股份有限公司 | UPS |
| CN107887968A (en) * | 2016-09-29 | 2018-04-06 | 易事特集团股份有限公司 | UPS |
| CN107968479A (en) * | 2016-10-19 | 2018-04-27 | 易事特集团股份有限公司 | Uninterruptible power supply system |
| CN106786583B (en) * | 2016-12-26 | 2019-05-17 | 易事特集团股份有限公司 | Uninterruptible power system and its harmonic wave of output voltage suppression circuit |
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| High Performance Stand-alone and Grid Connected Inverter Using Adaptive Total Sliding Mode Controller;Mohan A等;《International Conference on Advanced Computing and Communication Systems》;20131231;全文 |
| Improved Performance and Control of Hybrid Cascaded H-bridge Inverter for Utility Interactive Renewable Energy Applications;Li H等;《Power Electronics Specialists Conference》;20071231;全文 |
| Indirect Current Control Based Seamless Transfer of Three-phase Inverter in Distributed Generation;Liu Z等;《IEEE Transactions on Power Electronics》;20141231;第29卷(第7期);全文 |
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| CN105633959A (en) | 2016-06-01 |
| WO2017148150A1 (en) | 2017-09-08 |
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