CN105633959A - Uninterruptible power supply and control method thereof - Google Patents
Uninterruptible power supply and control method thereof Download PDFInfo
- Publication number
- CN105633959A CN105633959A CN201610126000.5A CN201610126000A CN105633959A CN 105633959 A CN105633959 A CN 105633959A CN 201610126000 A CN201610126000 A CN 201610126000A CN 105633959 A CN105633959 A CN 105633959A
- Authority
- CN
- China
- Prior art keywords
- current
- loop
- voltage
- circuit
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000012544 monitoring process Methods 0.000 claims abstract description 34
- 238000004146 energy storage Methods 0.000 claims abstract description 19
- 239000000284 extract Substances 0.000 claims abstract description 17
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims description 54
- 230000003068 static effect Effects 0.000 claims description 34
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 9
- 230000008439 repair process Effects 0.000 claims description 3
- 238000010615 ring circuit Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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
- H02J3/00—Circuit arrangements for ac mains or ac distribution 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
- H02J3/01—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
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Inverter Devices (AREA)
Abstract
An uninterruptible power supply comprises an energy storage battery, a monitoring circuit, a controllable switch, a grid-connected control circuit, an off-network control circuit, a mode changeover switch and a converter, wherein the grid-connected control circuit comprises a harmonic and reactive current extraction circuit and a current ring control circuit, and the off-network control circuit comprises a voltage outer ring circuit and a current inner ring circuit. When the above uninterruptible power supply is in grid connection, the grid-connected control circuit extracts a harmonic and reactive compensation instruction signal according to harmonic and reactive components in a mains supply and carries out reactive and harmonic compensation through current closed-loop control so as to reduce electric energy loss; the off-network control circuit does not take participate in controlling in a grid-connected mode while still is in a running state, and an off-network control signal can be generated according to a given voltage value of a voltage ring, an output voltage feedback signal and an output current feedback signal; and when the system is switched to an off-network mode from a grid-connected mode, the converter controls the output according to the off-network control signal so as to achieve seamless switching between the grid-connected mode and the off-network mode. The invention also relates to a control method of an uninterruptible power supply system.
Description
Technical field
The present invention relates to power supply technical field, particularly relate to a kind of uninterruptible power supply system and control method thereof.
Background technology
Along with the fast growth of data center power sources load in recent years, energy efficiency indexes requires more and more higher. For the uninterruptible power supply system (UPS) being applied to high-density data center, not only being powered for IT equipment, also to be ensured that the utility appliance such as the air-conditioning that IT equipment runs are powered, power supply demand can continue to increase. Owing to the densification of Data centre is a kind of inevitable trend, therefore the UPS of electric power safeguard is provided to propose brand-new requirement to for it. In traditional Data centre's power supply mode, general employing is based on the on line type UPS power supply of two conversion technology. The main drawback of this kind of on line type UPS is that the electric energy loss under environment powered by forceful electric power net is bigger, running cost is higher, further, traditional UPS can not effectively improve when electrical network quality of power supply difference, therefore can not meet the demand that Data centre's high quality is powered.
Summary of the invention
Based on this, it is necessary to provide a kind of electric energy loss less and the uninterruptible power supply system the electrical network quality of power supply improved and control method thereof can be realized.
Whether a kind of uninterruptible power supply system, comprises energy storage battery, also comprises: monitoring circuit, normal for monitoring city's electricity, and exports the first monitor signal when city's electricity is normal, exports the 2nd monitor signal when city's electrical anomaly; Controlled switch, is connected to and is connected between city's electricity and points of common connection and with described monitoring circuit; Described controlled switch conducting under the control of described first monitor signal so that described uninterruptible power supply system enters grid-connect mode; Described controlled switch disconnects under the control of described 2nd monitor signal so that described uninterruptible power supply system enters from net pattern; Cutting-in control circuit, comprises harmonic and reactive currents and extracts circuit and current loop control circuit; Described harmonic and reactive currents extracts circuit and is connected with the electricity side, city of described points of common connection, described current loop control circuit respectively; Described current loop control circuit is also connected with the output terminal of current transformer, to receive the outward current feedback signal of current transformer; Described harmonic and reactive currents extracts circuit and is used for the harmonic wave according to mains current and wattless component extraction harmonics and reactive compensation instruction signal; Described current loop control circuit is used for generating cutting-in control signal according to described harmonics and reactive compensation instruction signal, described outward current feedback signal; From net pilot circuit, comprise outer voltage circuit and current inner loop circuit; First input terminus of described outer voltage circuit is connected with the output terminal of current transformer, to receive the output voltage feedback signal of current transformer; 2nd input terminus of described outer voltage circuit is used for the given magnitude of voltage of receiver voltage ring; The output terminal of described outer voltage circuit is connected with the first input terminus of described current inner loop circuit; 2nd input terminus of described current inner loop circuit is connected with the output terminal of described current transformer, to receive the outward current feedback signal of described current transformer; Described outer voltage circuit is used for the output voltage feedback signal according to the given magnitude of voltage of described Voltage loop and described current transformer and generates current inner loop Setting signal; Described current inner loop circuit is used for generating from net control signal according to described current inner loop Setting signal and described outward current feedback signal; Mode selector switch; The inboardend of described mode selector switch is connected with the control end of described current transformer; First contact of described mode selector switch is connected with the output terminal of described cutting-in control circuit; 2nd contact of described mode selector switch is connected with the described output terminal from net pilot circuit; Described mode selector switch, for connecting the first contact under the control of described first monitor signal, connects the 2nd contact under the control of described 2nd monitor signal; And current transformer, described current transformer is connected between described energy storage battery and described points of common connection; Described current transformer is used for according to described cutting-in control signal or described output voltage or outward current is controlled from net control signal.
Wherein in an embodiment, also comprise drive signal generator; Described drive signal generator is connected between the inboardend of described mode selector switch and the control end of described current transformer; Described drive signal generator be used for according to described cutting-in control signal or described from net control signal generate actuate signal, so that described current transformer is controlled.
Wherein in an embodiment, described harmonic and reactive currents extracts circuit and comprises the first three phase static coordinate connected in turn to two-phase rotating frame conversion module, low-pass filter, first liang of cordic phase rotator to three-phase static coordinate system conversion module and the first three-phase totalizer; Described first three phase static coordinate is connected to the electricity side, city of described points of common connection to the input terminus that two-phase rotating frame changes module, and also input terminus with described first three-phase totalizer is connected; Described first three phase static coordinate is changed module to two-phase rotating frame and is carried out filtering process respectively for sending into described low-pass filter after three-phase mains electric current is converted to the d axle DC quantity with low-frequency ripple and q axle DC quantity; Described first liang of cordic phase rotator changes module for converting the d axle DC quantity after process and q axle DC quantity to three-phase electrical network current first harmonics component to three-phase static coordinate system; The three-phase electrical network current first harmonics component that described first three-phase totalizer obtains for harmonic and reactive currents extracts circuit and described three-phase mains electric current obtain the harmonics and reactive compensation instruction signal of three-phase mains electric current after subtracting each other; The current loop control circuit of described cutting-in control circuit comprises the 2nd three-phase totalizer and the current loop controller connected in turn; The input terminus of described 2nd three-phase totalizer is connected with the described output terminal of the first three-phase totalizer, the output terminal of current transformer respectively; The output terminal of described current loop controller is connected with the first contact of described mode selector switch; Described 2nd three-phase totalizer obtains three-phase error signal after the harmonics and reactive compensation instruction signal of described three-phase mains electric current and three-phase outward current feedback signal being subtracted each other; Described current loop controller is then for carrying out closed-loop control according to described three-phase error signal and generate three-phase grid control signal.
Wherein in an embodiment, described outer voltage circuit comprises Voltage loop totalizer and the Voltage loop controller of series connection mutually; First input terminus of described Voltage loop totalizer is connected with the output terminal of described current transformer, for receiving output voltage feedback signal; 2nd input terminus of described Voltage loop totalizer is for receiving the given magnitude of voltage of described Voltage loop; Described Voltage loop totalizer is for being undertaken subtracting each other obtaining voltage error signal by given for described Voltage loop magnitude of voltage and described output voltage feedback signal; Described Voltage loop controller is used for carrying out closed-loop control according to described error signal and generating current inner loop Setting signal; Described current inner loop circuit comprises the electric current loop totalizer and current loop controller that connect in turn; 2nd input terminus of described electric current loop totalizer is connected with the output terminal of described current transformer, to receive outward current feedback signal; First input terminus of described electric current loop totalizer is connected with the output terminal of described Voltage loop controller; The output terminal of described current loop controller is connected with the 2nd contact of described mode selector switch; Described electric current loop totalizer is for being undertaken subtracting each other obtaining current error signal by described current inner loop Setting signal and described outward current feedback signal; Described current loop controller is used for carrying out closed-loop control according to described current error signal and generates from net control signal.
Wherein in an embodiment, described outer voltage circuit also comprises the 2nd three phase static coordinate and changes module to two-phase rotating frame; Described Voltage loop totalizer comprises Voltage loop d axle totalizer and Voltage loop q axle totalizer; Described Voltage loop controller comprises Voltage loop d axis controller and Voltage loop q axis controller; The input terminus that described 2nd three phase static coordinate changes module to two-phase rotating frame is connected with the output terminal of described current transformer, and the output terminal that described 2nd three phase static coordinate changes module to two-phase rotating frame is connected with described Voltage loop d axle totalizer, Voltage loop q axle totalizer respectively; Described current inner loop circuit also comprises the 3rd three phase static coordinate and changes module to two-phase rotating frame conversion module and the 2nd liang of cordic phase rotator to three-phase static coordinate system; Described electric current loop totalizer comprises electric current loop d axle totalizer and electric current loop q axle totalizer; Described current loop controller comprises electric current loop d axis controller and electric current loop q axis controller; The input terminus that described 3rd three phase static coordinate changes module to two-phase rotating frame is connected with the output terminal of described current transformer; The output terminal that described 3rd three phase static coordinate changes module to two-phase rotating frame is connected with described electric current loop d axle totalizer, described electric current loop q axle totalizer respectively; The input terminus that described 2nd liang of cordic phase rotator changes module to three-phase static coordinate system respectively output terminal with described electric current loop d axis controller, electric current loop q axis controller is connected, described 2nd liang of cordic phase rotator is then connected with the 2nd contact of described mode selector switch to the output terminal of three-phase static coordinate system conversion module.
Wherein in an embodiment, described Voltage loop controller and described current loop controller are pi regulator.
Wherein in an embodiment, described current transformer is two-way current transformer; Described monitoring circuit is also for carrying out Real-Time Monitoring and output voltage values or remaining capacity value to the voltage of described energy storage battery or surplus capacity; Described uninterruptible power supply system also comprises comparison circuit; Described comparison circuit is connected with described monitoring circuit, described two-way current transformer respectively; Described comparison circuit for judging that when grid-connect mode whether described magnitude of voltage or described remaining capacity value are lower than preset value, and in described magnitude of voltage or described remaining capacity value lower than exporting charging signals during preset value; Described current transformer transfers rectification state according to described charging signals to by inverter mode and is charged by described energy storage battery.
Wherein in an embodiment, also comprise reactor; The input terminus of described reactor is connected with the output terminal of described controlled switch; The output terminal access points of common connection of described reactor.
Wherein in an embodiment, also comprise bypass switch; Described bypass switch is connected with city's electricity, load respectively; Described bypass switch is for the conducting when described uninterruptible power supply system needs to keep in repair thus by city's electricity directly to load supplying.
A control method for uninterruptible power supply system, switches at grid-connect mode with between net pattern for controlling the uninterruptible power supply system as described in aforementioned any embodiment, and described control method comprises: whether monitoring city electricity is normal; If city's electricity is normal, exports the first monitor signal and control controlled switch conducting so that described uninterruptible power supply system and city's electricity are incorporated into the power networks and enter grid-connect mode; The first contact connected by control mode switch switch; Control described harmonic and reactive currents and extract circuit according to the harmonic wave of mains current and wattless component extraction harmonics and reactive compensation instruction signal; Control described current loop control circuit to generate cutting-in control signal control with the outward current to described current transformer according to described harmonics and reactive compensation instruction signal, described outward current feedback signal; Controlling described from network control circuit working, but do not participate in the control process of cutting-in control circuit, described outer voltage circuit generates current inner loop Setting signal according to the given magnitude of voltage of described Voltage loop and described output voltage feedback signal; Described current inner loop circuit generates from net control signal according to described current inner loop Setting signal and described outward current feedback signal; If city's electrical anomaly, export the 2nd monitor signal and control the disconnection of controlled switch so that described uninterruptible power supply system independently powers to the load, and enters from net pattern; Control mode switch switch is connected to the 2nd contact from the first contact; The output voltage of described current transformer is controlled from net control signal according to described.
Above-mentioned uninterruptible power supply system has grid-connected and from net two kinds of operating mode. When city's electricity is normal, cutting-in control circuit extract harmonics and reactive compensation instruction signal according to the harmonic wave in mains current and wattless component and by the closed-loop current control of current transformer by harmonics and reactive compensation pulse current injectingt to electrical network to carry out idle and harmonic wave compensation, thus the electrical network quality of power supply is improved, decrease electric energy loss, there is higher energy efficiency index. Further, do not participate in control when grid-connect mode from net pilot circuit, but still it is in running status, can generate from net control signal according to the given magnitude of voltage of Voltage loop, output voltage feedback signal and outward current feedback signal. When uninterruptible power supply system is switched to from net pattern by grid-connect mode, current transformer its output is controlled from net control signal according to exporting from net pilot circuit, thus realize grid-connected/from the seamless switching of net pattern.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of the uninterruptible power supply system in an embodiment;
Fig. 2 is the schematic circuit diagram of the uninterruptible power supply system in Fig. 1;
The schematic diagram that the PCC point A phase quality of power supply is improved when being the operation of uninterruptible power supply system grid connection by Fig. 3;
Fig. 4 is that uninterruptible power supply system grid connection is to A phase effect schematic diagram during switching seamless from net.
Embodiment
In order to make the object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. It is to be understood that specific embodiment described herein is only in order to explain the present invention, it is not intended to limit the present invention.
Fig. 1 is the circuit block diagram of the uninterruptible power supply system in an embodiment, and Fig. 2 is the schematic circuit diagram of the uninterruptible power supply system in Fig. 1. This uninterruptible power supply system comprise energy storage battery 110, monitoring circuit (not shown), controlled switch 120, cutting-in control circuit 130, from net pilot circuit 140, mode selector switch 150 and current transformer 160.
Energy storage battery 110 is for storage of electrical energy, such that it is able to outwards output electric energy carries out normal operation for load. The battery types that energy storage battery 110 can adopt uninterruptible power supply system conventional realizes.
Monitoring circuit is for monitoring city's electricity, thus judges that whether city's electricity is normal according to monitoring situation. Specifically, monitor circuit and judge that whether city's electricity is normal by the three-phase voltage of city's electricity being carried out monitoring. In the present embodiment, city's electricity normally refers to that the voltage of city's electricity is in steady state, can not occur sharply to change (in the short period of time, voltage has bigger lifting or decline) and can normally export to load to power; City's electrical anomaly then refers to that the voltage of city's electricity plays pendulum or interrupts (namely can not normally export to load supplying). Monitoring circuit exports the first monitor signal when monitoring city's electricity and be normal, and exports the 2nd monitor signal when city's electrical anomaly.
Controlled switch 120 is connected between city's electricity and load, for the connection controlled between city's electricity and load. Specifically, controlled switch 120 comprises input terminus, output terminal and control end. The input terminus of controlled switch 120 is electrically connected with city, and output terminal is then connected with load by points of common connection PCC. The control end of controlled switch 120 is then connected with monitoring circuit. The first monitor signal that controlled switch 120 exports for receiving monitoring circuit and the 2nd monitor signal, and operate accordingly according to the monitor signal received. Controlled switch 120 conducting when receiving the first monitor signal, so that city's electricity is connected with load, powers to the load by city's electricity, and uninterruptible power supply system grid connection is run, and enters grid-connect mode. Controlled switch 120 disconnects under the control of the 2nd monitor signal, thus disconnects the connection between city's electricity and load, avoids the harm that load is caused by city's electrical anomaly. Now uninterruptible power supply system independently powers to the load, and enters from net pattern.
Cutting-in control circuit 130 for generating cutting-in control signal, with to and in network process the work of current transformer control. Specifically, cutting-in control circuit 130 comprises harmonic and reactive currents extraction circuit 132 and current loop control circuit 134. The input terminus that harmonic and reactive currents extracts circuit 132 is connected to the electricity side, city of points of common connection PCC, output terminal then input terminus with current loop control circuit 134 be connected. The input terminus of current loop control circuit 134 also output terminal with current transformer 140 be connected, to receive the outward current feedback signal of current transformer 140. The output terminal of current loop control circuit 134 is connected with the first contact of mode selector switch 150. Harmonic and reactive currents extracts circuit 132 and for extracting harmonics and reactive compensation instruction signal according to the harmonic wave in mains current and wattless component and is sent in current loop control circuit 134. Current loop control circuit 134 generates cutting-in control signal according to the outward current feedback signal of harmonics and reactive compensation instruction signal and current transformer 160.
From net pilot circuit 140 for generating from net control signal, to control from the work of current transformer in network process. Outer voltage circuit 142 and current inner loop circuit 144 is comprised from net pilot circuit 140. Wherein, the first input terminus of outer voltage circuit 142 is connected with the output terminal of current transformer 160, to receive the output voltage feedback signal of current transformer 160. 2nd input terminus of outer voltage circuit 160 is used for the given magnitude of voltage of receiver voltage ring. In the present embodiment, the given magnitude of voltage of Voltage loop is the voltage provided when city's electricity normally powers to the load. In other examples, it is also possible to arrange according to the service voltage of city's electricity in actual grid-connect mode. The output terminal of outer voltage circuit 142 is connected with the first input terminus of current inner loop circuit 144. 2nd input terminus of current inner loop circuit 144 then output terminal with current transformer 160 be connected, to receive the outward current feedback signal of current transformer 160. The output terminal of current inner loop circuit 144 is connected with the 2nd contact of mode selector switch 150. Outer voltage circuit 142 is for generating current inner loop Setting signal according to the given magnitude of voltage of Voltage loop and output voltage feedback signal. 144, current inner loop circuit generates from net control signal according to the outward current feedback signal of current inner loop Setting signal and current transformer 160. In the present embodiment, cutting-in control circuit 130 and be always in running status in uninterruptible power supply system operation from net pilot circuit 140, but whether participate in controlling, need the state according to mode selector switch 150 to control.
The inboardend of mode selector switch 150 is connected with the control end of current transformer 160, and the control end of mode selector switch 150 is then connected with monitoring circuit. Mode selector switch 150 connects the first contact under the control of the first monitor signal (being also grid-connect mode), thus the cutting-in control signal generated by cutting-in control circuit 130 exports the control end of current transformer 160 to. Current transformer 160 exports the harmonics and reactive compensation pulse current injectingt of actual needs to electrical network under the control of this cutting-in control signal, offset with the harmonic and reactive currents in original power network current, thus realize the effect of power network current sineization, unit power factor, reduce electric energy loss, it is to increase energy efficiency index. Mode selector switch 150 is forwarded to the 2nd contact by the first contact under the control of the 2nd monitor signal. Owing to being also in running status when grid-connect mode from net pilot circuit 140, what therefore can be about to when having switched generate exports to current transformer 160 from net control signal. Output is controlled from net control signal by current transformer 160 according to this, thus meets the power demands of load. Before and after pattern switching, from net pilot circuit 140 export identical from net control signal, it does not have big sudden change, reduces uninterruptible power supply system and switches to from the switching shock caused during net pattern by grid-connect mode, it is achieved grid-connected/from the seamless switching of net pattern.
Above-mentioned uninterruptible power supply system has grid-connected and from net two kinds of operating mode. When city's electricity is normal, cutting-in control circuit 130 extract harmonics and reactive compensation instruction signal according to the harmonic wave in mains current and wattless component and by the closed-loop current control of current transformer 160 by harmonics and reactive compensation pulse current injectingt to electrical network to carry out idle and harmonic wave compensation, thus the PCC point quality of power supply is improved, decrease electric energy loss, there is higher energy efficiency index. Further, do not participate in control when grid-connect mode from net pilot circuit 140, but still it is in running status, can generate from net control signal according to the given magnitude of voltage of Voltage loop, output voltage feedback signal and outward current feedback signal. When uninterruptible power supply system is switched to from net pattern by grid-connect mode, current transformer 160 its output is controlled from net control signal according to exporting from net pilot circuit 140. Pattern switching before and after, from net pilot circuit 140 export identical from net control signal, thus realize uninterruptible power supply system grid-connected/from the seamless switching of net pattern.
In the present embodiment, above-mentioned uninterruptible power supply system also comprises drive signal generator 170, filtering circuit 180, reactor 190 and bypass switch (not shown). Drive signal generator 170 is connected between the inboardend of mode selector switch 150 and the control end of current transformer 160. Drive signal generator 170 generates actuate signal for the cutting-in control signal that transmits according to mode selector switch 150 or from net control signal, to be controlled by current transformer 160. In the present embodiment, drive signal generator 170 is SPWM signal generator, and current transformer 160 is PWM converter.
Filtering circuit 180 is connected between the output terminal of current transformer 160 and points of common connection PCC. Filtering circuit 180 is for carrying out filtering process to the outward current of current transformer 160. Specifically, filtering circuit 180 is LC filtering circuit.
Reactor 190 is connected between controlled switch 120 and points of common connection PCC. Reactor 190 is for leaving city's electricity with load isolation, it is ensured that the sineization of grid side electric current. Bypass switch is then connected between load and city's electricity, for the conducting when uninterruptible power supply system needs to keep in repair, thus by city's electricity directly to load supplying, it is ensured that during uninterruptible power supply system exception, load still can normal operation.
In the present embodiment, harmonic and reactive currents extraction circuit 132 comprises the first three phase static coordinate connected in turn to two-phase rotating frame conversion module (namely an abc/dq changes module) 1322, low-pass filter 1324, first liang of cordic phase rotator to three-phase static coordinate system conversion module (namely a dq/abc changes module) 1326 and the first three-phase totalizer 1328. The input terminus of the one abc/dq conversion module 1322 is connected to the electricity side, city of points of common connection PCC, for receiving three-phase mains electric current (igA��igB��igC). The input terminus that one abc/dq changes module 1322 also input terminus with the first three-phase totalizer 1328 be connected, thus by three-phase mains electric current (igA��igB��igC) input in the first three-phase totalizer 1328. One abc/dq changes module 1322 for realizing the conversion of abc three-phase static coordinate system to dq two-phase rotating frame, by three-phase mains electric current (igA��igB��igC) be converted to the d axle DC quantity I containing low-frequency ripplegdhWith q axle DC quantity Igqh, and be fed through respectively in low-pass filter 1324. Low-pass filter 1324 is respectively to the d axle DC quantity I of inputgdhWith q axle DC quantity IgqhCarry out filtering process to obtain d axle DC quantity I pure accordinglygdWith q axle DC quantity Igq. The input terminus that one dq/abc changes module 1326 is connected with the output terminal of low-pass filter 1324, its output terminal then input terminus with the first three-phase totalizer 1328 be connected. One dq/abc changes module 1326 for the d axle DC quantity I by inputgdWith q axle DC quantity IgqConvert three-phase electrical network current first harmonics component (i togAf��igBf��igCf). General three-phase power network current can be analyzed to fundamental current, harmonic and reactive currents two portions, that is:
igA=igAf+igAh;
igB=igBf+igBh;
igC=igCf+igCh��
First three-phase totalizer 1328 is for by three-phase electrical network current first harmonics component (igAf��igBf��igCf) and three-phase mains electric current (igA��igB��igC) subtract each other after obtain the harmonics and reactive compensation instruction signal (i of three-phase mains electric currentgAhref��igBhref��igChref), that is:
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 140 comprises the 2nd three-phase totalizer 1342 and current loop controller 1344 that connect in turn. Wherein, the input terminus of the 2nd three-phase totalizer 1342 is connected with the output terminal of the first three-phase totalizer 1328 and the output terminal of current transformer 130 respectively. The output terminal of the 2nd three-phase totalizer 1342 then input terminus with current loop controller 1344 be connected. The output terminal of current loop controller 1344 is connected with the first contact 1 of analog change-over switch 150. Harmonics and reactive compensation instruction signal (the i of 2nd three-phase totalizer 1342 for the first three-phase totalizer 1328 is exportedgAhref��igBhref��igChref) with the outward current feedback signal (i of current transformer 160 output terminalA��iB��iC) subtract each other after obtain error signal after be sent in current loop controller 1344. Current loop controller 1344 is for carrying out closed-loop control according to this error signal and generates three-phase grid control signal (Varef1��Vbref1��Vcref1). In the present embodiment, current loop controller 1344 is pi regulator.
Comprise the 2nd three phase static coordinate from the outer voltage circuit in net pilot circuit 140 and change module (namely the 2nd abc/dq changes module) 310, Voltage loop totalizer and Voltage loop controller to two-phase rotating frame. Wherein, Voltage loop totalizer comprises Voltage loop d axle totalizer 322 and Voltage loop q axle totalizer 324; Voltage loop controller comprises Voltage loop d axis controller 332 and Voltage loop q axis controller 334 equally. The input terminus that 2nd abc/dq changes module 310 is connected with the output terminal of current transformer 160, and its output terminal is then connected with Voltage loop d axle totalizer 322, Voltage loop q axle totalizer 324 respectively. Voltage loop d axle totalizer 322 is connected with Voltage loop d axis controller 332, and Voltage loop q axle totalizer 324 is connected with Voltage loop q axis controller 334. 2nd abc/dq changes module 310 for the three-phase output voltage (u by current transformer 160 output terminalA��uB��uC) be converted to d axle voltage feedback value UdWith q axle voltage UqRear it is fed through Voltage loop d axle totalizer 322 and the first input terminus of Voltage loop q axle totalizer 324 respectively. 2nd input terminus of Voltage loop d axle totalizer 322 is then for the receiver voltage given magnitude of voltage U of ring d axledref *. 2nd input terminus of Voltage loop q axle totalizer 324 is then for the receiver voltage given magnitude of voltage U of ring q axleqref *. Voltage loop d axle totalizer 322 is by the given magnitude of voltage U of Voltage loop d axle of inputdref *With d axle voltage feedback value UdIt is sent to after obtaining error signal after subtracting each other in Voltage loop d axis controller 332. Voltage loop d axis controller 332 is for carrying out closed-loop control according to this error signal and generates d shaft current inner ring Setting signal Id *. The principle of work of Voltage loop q axle totalizer 334 and Voltage loop q axis controller 332 is similar, does not repeat explanation.
Comprise the 3rd three phase static coordinate from the current inner loop circuit in net pilot circuit 140 and change module (namely the 3rd abc/dq changes module) 340, electric current loop totalizer, current loop controller and the 2nd liang of cordic phase rotator to three-phase static coordinate system conversion module (namely the 2nd dq/abc changes module) 370 to two-phase rotating frame. Wherein, electric current loop totalizer comprises electric current loop d axle totalizer 352 and electric current loop q axle totalizer 354, and current loop controller comprises electric current loop d axis controller 362 and electric current loop q axis controller 364 equally. The input terminus that 3rd abc/dq changes module 340 is connected with the output terminal of current transformer 160, to receive three-phase outward current feedback signal (iA��iB��iC). The output terminal that 3rd abc/dq changes module 340 is connected with the 2nd input terminus of electric current loop d axle totalizer 352, the 2nd input terminus of electric current loop q axle totalizer 354 respectively. First input terminus of electric current loop d totalizer 352 then output terminal with Voltage loop d axis controller 332 be connected, its output terminal is then connected with electric current loop d axis controller 362. First input terminus of electric current loop q axle totalizer 354 is connected with the output terminal of Voltage loop q axis controller 334, and its output terminal is then connected with electric current loop q axis controller 364. The input terminus that the output terminal of electric current loop d axis controller 362 and electric current loop q axis controller 364 changes module 370 with the 2nd dq/abc respectively is connected. The output terminal that 2nd dq/abc changes module 370 is then connected with the 2nd contact 2 of mode selector switch 150. Wherein, the 3rd abc/dq changes module 340 for by the three-phase outward current (i of current transformer 160A��iB��iC) be converted to d shaft current IdWith q shaft current IqAnd be fed through respectively in electric current loop d axle totalizer 352 and electric current loop q axle totalizer 354. Electric current loop d axle totalizer 352 is by the d shaft current inner ring Setting signal I of inputd *With d shaft current IdObtain error signal after subtracting each other and it is sent to electric current loop d axis controller 362 to generate d axle control signal udo. Same, electric current loop q axis controller also can generate q axle control signal uqo. 2nd dq/abc changes module 370 according to the d axle control signal u of inputdoAnd q axle control signal uqoGenerate three-phase from net control signal (Varef2��Vbref2��Vcref2). In the present embodiment, current loop controller and Voltage loop controller are pi regulator.
The control method of above-mentioned uninterruptible power supply system is as follows:
After system start-up, monitoring circuit continues work, and whether monitoring city electricity is normal.
When city's electricity is normal, monitoring circuit exports the first monitor signal and controls the conducting of controlled switch 120, and uninterruptible power supply system enters grid-connect mode. Now, mode selector switch 150 is connected to the first contact 1, thus the cutting-in control signal (V exported by cutting-in control circuit 130aref1��Vbref1��Vcref1) generate actuate signal via drive signal generator 170 after the output of current transformer 160 is controlled. Current transformer 160 exports the harmonics and reactive compensation electric current of actual needs according to the actuate signal received and is injected into electrical network, and the harmonic and reactive currents in original power network current offsets, thus realizes the effect of power network current sineization, unit power factor. The schematic diagram that the PCC point A phase quality of power supply is improved when being the operation of uninterruptible power supply system grid connection by Fig. 3. At t0Before moment, uninterruptible power supply system is not connected to the grid, by city's electricity powering load. When in load A phase current containing harmonic wave, A phase power network current igAWaveform distortion is serious, and the PCC point place advanced A phase current of A phase voltage, illustrates A phase power network current i simultaneouslygAMiddle wattless component is also bigger, it is necessary to compensate. At t0In the moment, ups power system drops into, and is connected to the grid, to the harmonic wave in A phase power network current with idle compensate. Because power network current can be analyzed to fundamental current and harmonic wave adds wattless current two portions, i.e. igA=igAf+igAh. Humorous in power network current is involved idle compensating by UPS output harmonic wave and reactive-load compensation electric current. After compensation, A phase power network current waveform turns into pure sinusoid, and A phase current is consistent with voltage-phase, eliminates idle, only there is watt component, therefore well completes the function that the quality of power supply is improved, and reduces electric energy loss.
When grid-connect mode, the voltage of energy storage battery 110 or residue electricity are also carried out monitoring and output voltage values and residual electric quantity by monitoring circuit. Uninterruptible power supply system then also comprises comparison circuit (not shown). One of them input terminus of comparison circuit is connected with monitoring circuit, another input terminus then for receiving preset value, output terminal then control end with current transformer 160 be connected. Comparison circuit is used for comparing input voltage value or remaining capacity value and preset value, judges that whether battery voltage value or remaining capacity value are lower than preset value, if it is exports charging signals (for level signal). Current transformer 160 is converted to rectification state by inverter mode under the control of this charging signals, charges to after city's electricity is carried out rectification energy storage battery 110. After system start-up, monitoring circuit and comparison circuit always in running order, thus realize and network process in energy storage battery 110 charge control. From net pilot circuit when grid-connect mode, also it is in running status, but does not participate in control process.
When grid-connect mode, uninterruptible power supply system and bulk power grid are incorporated into the power networks, but the three-phase voltage simultaneously monitoring circuit Hui Dui city electricity carries out Real-Time Monitoring. Once monitor city's electrical anomaly or interruption, controlled switch 120 will be disconnected, and uninterruptible power supply system enters from net pattern. Mode selector switch 150 is forwarded to the 2nd contact 2 by the first contact 1. From net pilot circuit 140 by generate from net control signal (Varef2��Vbref2��Vcref2) be sent in drive signal generator 170 to generate actuate signal by the 2nd contact 2. Its output is controlled by current transformer 160 under the control of this actuate signal, thus powering load. Fig. 4 is that uninterruptible power supply system grid connection is to A phase effect schematic diagram during switching seamless from net. At t0Before moment, uninterruptible power supply system grid connection is run, and gives important load supplying by city's electricity, and current transformer charges from city's electricity power taking to energy storage battery simultaneously, i.e. igA=iLA+iA. Due to charging current iAVery little, therefore load current iLAAlmost equal mains current igA. At t0In the moment, ups power system is switched to from net pattern from grid-connect mode, mains current igABeing zero, current transformer 160 is switched to inversion working order from charging state, by energy storage battery 110 through current transformer 160 powering load, and now load current iLAIt is equal to UPS outward current iA, i.e. iLA=iA��
When city's electricity voltage resume is normal, controlled switch 120 will be closed again, gives important load supplying by city's electricity, and carries out harmonics and reactive compensation according to the harmonic wave in mains current and wattless component, improves the quality of power supply of PCC point.
Above-mentioned uninterruptible power supply system has grid-connect mode and from network operation two kinds of operating mode. Being connected to the grid when city's electricity is normal, harmonic wave and wattless component in mains current carry out harmonics and reactive compensation, improve the quality of power supply of PCC point city electricity, and while charges to energy storage battery 110 lower than during preset value at voltage or the capacity of energy storage battery 110. Switch seamlessly to when city's electrical anomaly from net pattern, ensure the lasting power supply of load. Above-mentioned uninterruptible power supply system consumes energy minimum in forceful electric power net situation, and efficiency is the highest, and maintenance cost is extremely low, and the life-span of its battery is longer than tradition UPS, and whole system can be arranged on open air, for user saves the valuable interior space.
Each technology feature of the above embodiment can combine arbitrarily, for making description succinct, each all possible combination of technology feature in above-described embodiment is not all described, but, as long as the combination of these technology features does not exist contradiction, all it is considered to be the scope that this specification sheets is recorded.
The above embodiment only have expressed several enforcement modes of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent. , it is also possible to make some distortion and improvement, it should be appreciated that for the person of ordinary skill of the art, without departing from the inventive concept of the premise these all belong to protection scope of the present invention. Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a uninterruptible power supply system, comprises energy storage battery, it is characterised in that, also comprise:
Monitoring circuit, whether normal for monitoring city's electricity, and export the first monitor signal when city's electricity is normal, the 2nd monitor signal is exported when city's electrical anomaly;
Controlled switch, is connected to and is connected between city's electricity and points of common connection and with described monitoring circuit; Described controlled switch conducting under the control of described first monitor signal so that described uninterruptible power supply system enters grid-connect mode; Described controlled switch disconnects under the control of described 2nd monitor signal so that described uninterruptible power supply system enters from net pattern;
Cutting-in control circuit, comprises harmonic and reactive currents and extracts circuit and current loop control circuit; Described harmonic and reactive currents extracts circuit and is connected with the electricity side, city of described points of common connection, described current loop control circuit respectively; Described current loop control circuit is also connected with the output terminal of current transformer, to receive the outward current feedback signal of current transformer; Described harmonic and reactive currents extracts circuit and is used for the harmonic wave according to mains current and wattless component extraction harmonics and reactive compensation instruction signal; Described current loop control circuit is used for generating cutting-in control signal according to described harmonics and reactive compensation instruction signal, described outward current feedback signal;
From net pilot circuit, comprise outer voltage circuit and current inner loop circuit; First input terminus of described outer voltage circuit is connected with the output terminal of current transformer, to receive the output voltage feedback signal of current transformer; 2nd input terminus of described outer voltage circuit is used for the given magnitude of voltage of receiver voltage ring; The output terminal of described outer voltage circuit is connected with the first input terminus of described current inner loop circuit; 2nd input terminus of described current inner loop circuit is connected with the output terminal of described current transformer, to receive the outward current feedback signal of described current transformer; Described outer voltage circuit is used for the output voltage feedback signal according to the given magnitude of voltage of described Voltage loop and described current transformer and generates current inner loop Setting signal; Described current inner loop circuit is used for generating from net control signal according to described current inner loop Setting signal and described outward current feedback signal;
Mode selector switch; The inboardend of described mode selector switch is connected with the control end of described current transformer; First contact of described mode selector switch is connected with the output terminal of described cutting-in control circuit; 2nd contact of described mode selector switch is connected with the described output terminal from net pilot circuit; Described mode selector switch, for connecting the first contact under the control of described first monitor signal, connects the 2nd contact under the control of described 2nd monitor signal; And
Current transformer, described current transformer is connected between described energy storage battery and described points of common connection; Described current transformer is used for according to described cutting-in control signal or described output voltage or outward current is controlled from net control signal.
2. uninterruptible power supply system according to claim 1, it is characterised in that, also comprise drive signal generator; Described drive signal generator is connected between the inboardend of described mode selector switch and the control end of described current transformer; Described drive signal generator be used for according to described cutting-in control signal or described from net control signal generate actuate signal, so that described current transformer is controlled.
3. uninterruptible power supply system according to claim 1, it is characterized in that, described harmonic and reactive currents extracts circuit and comprises the first three phase static coordinate connected in turn to two-phase rotating frame conversion module, low-pass filter, first liang of cordic phase rotator to three-phase static coordinate system conversion module and the first three-phase totalizer; Described first three phase static coordinate is connected to the electricity side, city of described points of common connection to the input terminus that two-phase rotating frame changes module, and also input terminus with described first three-phase totalizer is connected; Described first three phase static coordinate is changed module to two-phase rotating frame and is carried out filtering process respectively for sending into described low-pass filter after three-phase mains electric current is converted to the d axle DC quantity with low-frequency ripple and q axle DC quantity; Described first liang of cordic phase rotator changes module for converting the d axle DC quantity after process and q axle DC quantity to three-phase electrical network current first harmonics component to three-phase static coordinate system; The three-phase electrical network current first harmonics component that described first three-phase totalizer obtains for harmonic and reactive currents extracts circuit and described three-phase mains electric current obtain the harmonics and reactive compensation instruction signal of three-phase mains electric current after subtracting each other;
The current loop control circuit of described cutting-in control circuit comprises the 2nd three-phase totalizer and the current loop controller connected in turn; The input terminus of described 2nd three-phase totalizer is connected with the described output terminal of the first three-phase totalizer, the output terminal of current transformer respectively; The output terminal of described current loop controller is connected with the first contact of described mode selector switch; Described 2nd three-phase totalizer obtains three-phase error signal after the harmonics and reactive compensation instruction signal of described three-phase mains electric current and three-phase outward current feedback signal being subtracted each other; Described current loop controller is then for carrying out closed-loop control according to described three-phase error signal and generate three-phase grid control signal.
4. uninterruptible power supply system according to claim 1, it is characterised in that, described outer voltage circuit comprises Voltage loop totalizer and the Voltage loop controller of series connection mutually; First input terminus of described Voltage loop totalizer is connected with the output terminal of described current transformer, for receiving output voltage feedback signal; 2nd input terminus of described Voltage loop totalizer is for receiving the given magnitude of voltage of described Voltage loop; Described Voltage loop totalizer is for being undertaken subtracting each other obtaining voltage error signal by given for described Voltage loop magnitude of voltage and described output voltage feedback signal; Described Voltage loop controller is used for carrying out closed-loop control according to described error signal and generating current inner loop Setting signal;
Described current inner loop circuit comprises the electric current loop totalizer and current loop controller that connect in turn; 2nd input terminus of described electric current loop totalizer is connected with the output terminal of described current transformer, to receive outward current feedback signal; First input terminus of described electric current loop totalizer is connected with the output terminal of described Voltage loop controller; The output terminal of described current loop controller is connected with the 2nd contact of described mode selector switch; Described electric current loop totalizer is for being undertaken subtracting each other obtaining current error signal by described current inner loop Setting signal and described outward current feedback signal; Described current loop controller is used for carrying out closed-loop control according to described current error signal and generates from net control signal.
5. uninterruptible power supply system according to claim 4, it is characterised in that, described outer voltage circuit also comprises the 2nd three phase static coordinate and changes module to two-phase rotating frame; Described Voltage loop totalizer comprises Voltage loop d axle totalizer and Voltage loop q axle totalizer; Described Voltage loop controller comprises Voltage loop d axis controller and Voltage loop q axis controller; The input terminus that described 2nd three phase static coordinate changes module to two-phase rotating frame is connected with the output terminal of described current transformer, and the output terminal that described 2nd three phase static coordinate changes module to two-phase rotating frame is connected with described Voltage loop d axle totalizer, Voltage loop q axle totalizer respectively;
Described current inner loop circuit also comprises the 3rd three phase static coordinate and changes module to two-phase rotating frame conversion module and the 2nd liang of cordic phase rotator to three-phase static coordinate system; Described electric current loop totalizer comprises electric current loop d axle totalizer and electric current loop q axle totalizer; Described current loop controller comprises electric current loop d axis controller and electric current loop q axis controller; The input terminus that described 3rd three phase static coordinate changes module to two-phase rotating frame is connected with the output terminal of described current transformer; The output terminal that described 3rd three phase static coordinate changes module to two-phase rotating frame is connected with described electric current loop d axle totalizer, described electric current loop q axle totalizer respectively; The input terminus that described 2nd liang of cordic phase rotator changes module to three-phase static coordinate system respectively output terminal with described electric current loop d axis controller, electric current loop q axis controller is connected, described 2nd liang of cordic phase rotator is then connected with the 2nd contact of described mode selector switch to the output terminal of three-phase static coordinate system conversion module.
6. uninterruptible power supply system according to claim 4, it is characterised in that, described Voltage loop controller and described current loop controller are pi regulator.
7. uninterruptible power supply system according to claim 1, it is characterised in that, described current transformer is two-way current transformer; Described monitoring circuit is also for carrying out Real-Time Monitoring and output voltage values or remaining capacity value to the voltage of described energy storage battery or surplus capacity;
Described uninterruptible power supply system also comprises comparison circuit; Described comparison circuit is connected with described monitoring circuit, described two-way current transformer respectively; Described comparison circuit for judging that when grid-connect mode whether described magnitude of voltage or described remaining capacity value are lower than preset value, and in described magnitude of voltage or described remaining capacity value lower than exporting charging signals during preset value; Described current transformer transfers rectification state according to described charging signals to by inverter mode and is charged by described energy storage battery.
8. uninterruptible power supply system according to claim 1, it is characterised in that, also comprise reactor; The input terminus of described reactor is connected with the output terminal of described controlled switch; The output terminal access points of common connection of described reactor.
9. uninterruptible power supply system according to claim 1, it is characterised in that, also comprise bypass switch; Described bypass switch is connected with city's electricity, load respectively; Described bypass switch is for the conducting when described uninterruptible power supply system needs to keep in repair thus by city's electricity directly to load supplying.
10. a control method for uninterruptible power supply system, for control as arbitrary in claim 1��9 as described in uninterruptible power supply system switch at grid-connect mode with between net pattern, it is characterised in that, described control method comprises:
Whether monitoring city electricity is normal;
If city's electricity is normal, exports the first monitor signal and control controlled switch conducting so that described uninterruptible power supply system and city's electricity are incorporated into the power networks and enter grid-connect mode; The first contact connected by control mode switch switch; Control described harmonic and reactive currents and extract circuit according to the harmonic wave of mains current and wattless component extraction harmonics and reactive compensation instruction signal; Control described current loop control circuit to generate cutting-in control signal control with the outward current to described current transformer according to described harmonics and reactive compensation instruction signal, described outward current feedback signal; Controlling described from network control circuit working, but do not participate in the control process of cutting-in control circuit, described outer voltage circuit generates current inner loop Setting signal according to the given magnitude of voltage of described Voltage loop and described output voltage feedback signal; Described current inner loop circuit generates from net control signal according to described current inner loop Setting signal and described outward current feedback signal;
If city's electrical anomaly, export the 2nd monitor signal and control the disconnection of controlled switch so that described uninterruptible power supply system independently powers to the load, and enters from net pattern; Control mode switch switch is connected to the 2nd contact from the first contact; The output voltage of described current transformer is controlled from net control signal according to described.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610126000.5A CN105633959B (en) | 2016-03-04 | 2016-03-04 | Uninterruptible power system and its control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105633959A true CN105633959A (en) | 2016-06-01 |
| CN105633959B CN105633959B (en) | 2019-02-12 |
Family
ID=56048626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610126000.5A Active CN105633959B (en) | 2016-03-04 | 2016-03-04 | Uninterruptible power system and its control method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105633959B (en) |
| WO (1) | WO2017148150A1 (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786583A (en) * | 2016-12-26 | 2017-05-31 | 易事特集团股份有限公司 | Uninterruptible power system and its harmonic wave of output voltage suppression circuit |
| CN106786582A (en) * | 2016-12-26 | 2017-05-31 | 易事特集团股份有限公司 | Uninterruptible power system and its harmonic wave of output voltage suppression circuit |
| CN106803678A (en) * | 2017-03-31 | 2017-06-06 | 易事特集团股份有限公司 | Uninterruptible power system and its power adjusting control circuit |
| CN106849331A (en) * | 2017-02-21 | 2017-06-13 | 易事特集团股份有限公司 | Uninterruptible power system and its power adjusting control circuit |
| WO2017148150A1 (en) * | 2016-03-04 | 2017-09-08 | 易事特集团股份有限公司 | Uninterruptible power system and control method thereof |
| CN107887968A (en) * | 2016-09-29 | 2018-04-06 | 易事特集团股份有限公司 | Uninterruptible power system |
| CN107887920A (en) * | 2016-09-29 | 2018-04-06 | 易事特集团股份有限公司 | Uninterruptible power system |
| CN107968479A (en) * | 2016-10-19 | 2018-04-27 | 易事特集团股份有限公司 | Uninterruptible power system |
| CN109066817A (en) * | 2018-07-09 | 2018-12-21 | 中山大学 | A kind of light storage micro-grid system and reactive power support control method based on Active Disturbance Rejection Control |
| CN109066816A (en) * | 2018-07-09 | 2018-12-21 | 中山大学 | A kind of micro-grid connection control system can provide reactive power support |
| CN109066704A (en) * | 2018-07-09 | 2018-12-21 | 中山大学 | A kind of micro-grid connection control method based on Active Disturbance Rejection Control |
| CN109585955A (en) * | 2018-12-29 | 2019-04-05 | 浙江南都电源动力股份有限公司 | Data center's energy storage preparation time support method and system |
| CN109728625A (en) * | 2018-12-29 | 2019-05-07 | 浙江南都电源动力股份有限公司 | Data center's energy storage SOC calibration method, apparatus and system |
| CN110739680A (en) * | 2019-09-30 | 2020-01-31 | 云南大红山管道有限公司 | power supply system applied to large-scale water delivery and transfer system and operation method |
| TWI694326B (en) * | 2018-08-24 | 2020-05-21 | 台達電子工業股份有限公司 | Uninterruptible power supply and method of operating the same |
| CN111900752A (en) * | 2020-07-01 | 2020-11-06 | 广州智光电气技术有限公司 | Energy storage converter output voltage control method, device, equipment and storage medium |
| CN112366794A (en) * | 2020-11-30 | 2021-02-12 | 科华恒盛股份有限公司 | Battery charging control device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10734821B2 (en) | 2018-03-08 | 2020-08-04 | Saudi Arabian Oil Company | Power control system |
| CN108880317B (en) * | 2018-09-12 | 2024-01-09 | 珠海泰通电气技术有限公司 | Three-ring control device and method for converter |
| CN114039410A (en) * | 2021-11-11 | 2022-02-11 | 深圳市华宝新能源股份有限公司 | Automatic continuous power supply and system |
| CN117239813B (en) * | 2023-11-15 | 2024-01-26 | 国网江苏省电力有限公司 | Low-voltage energy storage converter control method considering harmonic suppression |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07219660A (en) * | 1994-02-04 | 1995-08-18 | Fuji Electric Co Ltd | Control method for noninterruptive power unit |
| CN101917013A (en) * | 2010-08-10 | 2010-12-15 | 华中科技大学 | Double-feed wind power generating system with energy storage function |
| KR20140065573A (en) * | 2012-11-16 | 2014-05-30 | 전자부품연구원 | Control operating system and method for energy development source |
| CN104134997A (en) * | 2014-07-16 | 2014-11-05 | 清华大学 | Unified power quality controller employing resonant electronic switch, and method |
| CN104377723A (en) * | 2014-08-29 | 2015-02-25 | 中国人民解放军海军工程大学 | Transient state process control method for static medium-frequency power supply networking system |
| CN205489525U (en) * | 2016-03-04 | 2016-08-17 | 易事特集团股份有限公司 | Uninterruptible power supply system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2114507A1 (en) * | 1994-01-28 | 1995-07-29 | Seshadri Sivakumar | Bimodal fast transfer off-line uninterruptible power supply |
| CN102882237B (en) * | 2011-07-15 | 2014-12-10 | 珠海银隆新能源有限公司 | Intelligent energy storage machine and operating method thereof |
| CN105633959B (en) * | 2016-03-04 | 2019-02-12 | 易事特集团股份有限公司 | Uninterruptible power system and its control method |
-
2016
- 2016-03-04 CN CN201610126000.5A patent/CN105633959B/en active Active
- 2016-10-08 WO PCT/CN2016/101470 patent/WO2017148150A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07219660A (en) * | 1994-02-04 | 1995-08-18 | Fuji Electric Co Ltd | Control method for noninterruptive power unit |
| CN101917013A (en) * | 2010-08-10 | 2010-12-15 | 华中科技大学 | Double-feed wind power generating system with energy storage function |
| KR20140065573A (en) * | 2012-11-16 | 2014-05-30 | 전자부품연구원 | Control operating system and method for energy development source |
| CN104134997A (en) * | 2014-07-16 | 2014-11-05 | 清华大学 | Unified power quality controller employing resonant electronic switch, and method |
| CN104377723A (en) * | 2014-08-29 | 2015-02-25 | 中国人民解放军海军工程大学 | Transient state process control method for static medium-frequency power supply networking system |
| CN205489525U (en) * | 2016-03-04 | 2016-08-17 | 易事特集团股份有限公司 | Uninterruptible power supply system |
Non-Patent Citations (3)
| Title |
|---|
| LI H等: "Improved Performance and Control of Hybrid Cascaded H-bridge Inverter for Utility Interactive Renewable Energy Applications", 《POWER ELECTRONICS SPECIALISTS CONFERENCE》 * |
| LIU Z等: "Indirect Current Control Based Seamless Transfer of Three-phase Inverter in Distributed Generation", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》 * |
| MOHAN A等: "High Performance Stand-alone and Grid Connected Inverter Using Adaptive Total Sliding Mode Controller", 《INTERNATIONAL CONFERENCE ON ADVANCED COMPUTING AND COMMUNICATION SYSTEMS》 * |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017148150A1 (en) * | 2016-03-04 | 2017-09-08 | 易事特集团股份有限公司 | Uninterruptible power system and control method thereof |
| CN107887968A (en) * | 2016-09-29 | 2018-04-06 | 易事特集团股份有限公司 | Uninterruptible power system |
| CN107887920A (en) * | 2016-09-29 | 2018-04-06 | 易事特集团股份有限公司 | Uninterruptible power system |
| CN107968479A (en) * | 2016-10-19 | 2018-04-27 | 易事特集团股份有限公司 | Uninterruptible power 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 |
| CN106786582A (en) * | 2016-12-26 | 2017-05-31 | 易事特集团股份有限公司 | Uninterruptible power system and its harmonic wave of output voltage suppression circuit |
| CN106786583A (en) * | 2016-12-26 | 2017-05-31 | 易事特集团股份有限公司 | Uninterruptible power system and its harmonic wave of output voltage suppression circuit |
| CN106786582B (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 |
| CN106849331B (en) * | 2017-02-21 | 2019-05-17 | 易事特集团股份有限公司 | Uninterruptible power system and its power regulation control circuit |
| CN106849331A (en) * | 2017-02-21 | 2017-06-13 | 易事特集团股份有限公司 | Uninterruptible power system and its power adjusting control circuit |
| CN106803678A (en) * | 2017-03-31 | 2017-06-06 | 易事特集团股份有限公司 | Uninterruptible power system and its power adjusting control circuit |
| CN106803678B (en) * | 2017-03-31 | 2019-07-09 | 易事特集团股份有限公司 | Uninterruptible power system and its power regulation control circuit |
| CN109066704A (en) * | 2018-07-09 | 2018-12-21 | 中山大学 | A kind of micro-grid connection control method based on Active Disturbance Rejection Control |
| CN109066816A (en) * | 2018-07-09 | 2018-12-21 | 中山大学 | A kind of micro-grid connection control system can provide reactive power support |
| CN109066817A (en) * | 2018-07-09 | 2018-12-21 | 中山大学 | A kind of light storage micro-grid system and reactive power support control method based on Active Disturbance Rejection Control |
| TWI694326B (en) * | 2018-08-24 | 2020-05-21 | 台達電子工業股份有限公司 | Uninterruptible power supply and method of operating the same |
| CN109728625A (en) * | 2018-12-29 | 2019-05-07 | 浙江南都电源动力股份有限公司 | Data center's energy storage SOC calibration method, apparatus and system |
| CN109585955A (en) * | 2018-12-29 | 2019-04-05 | 浙江南都电源动力股份有限公司 | Data center's energy storage preparation time support method and system |
| CN110739680A (en) * | 2019-09-30 | 2020-01-31 | 云南大红山管道有限公司 | power supply system applied to large-scale water delivery and transfer system and operation method |
| CN111900752A (en) * | 2020-07-01 | 2020-11-06 | 广州智光电气技术有限公司 | Energy storage converter output voltage control method, device, equipment and storage medium |
| CN111900752B (en) * | 2020-07-01 | 2023-12-19 | 广州智光电气技术有限公司 | Method, device, equipment and storage medium for controlling output voltage of energy storage converter |
| CN112366794A (en) * | 2020-11-30 | 2021-02-12 | 科华恒盛股份有限公司 | Battery charging control device |
| CN112366794B (en) * | 2020-11-30 | 2023-04-28 | 科华恒盛股份有限公司 | Battery charging control device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017148150A1 (en) | 2017-09-08 |
| CN105633959B (en) | 2019-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105633959A (en) | Uninterruptible power supply and control method thereof | |
| CN205489525U (en) | Uninterruptible power supply system | |
| CN103427430B (en) | A kind of energy management method of mixed energy storage system in microgrid | |
| US20120044728A1 (en) | Electric power converter | |
| CN104810858A (en) | Control method for grid-connected power generation system of optical storage microgrid | |
| KR100944528B1 (en) | Power converter apparatus for charging battery of electric vehicle and method for controlling the same | |
| CN201374571Y (en) | Online UPS | |
| CN104218840A (en) | Micro-grid energy storage topological inverter and method for operating same | |
| CN105406583A (en) | Uninterrupted power system and control method thereof | |
| CN105471092A (en) | Uninterruptible power system | |
| CN107887920A (en) | Uninterruptible power system | |
| CN107887968A (en) | Uninterruptible power system | |
| CN205791773U (en) | Non-interrupted power supply system | |
| CN205319794U (en) | Uninterruptible power supply system | |
| CN205429759U (en) | Little grid system | |
| WO2018060129A1 (en) | A power converter system for power quality compensation and load balancing connected to an electric power distribution grid | |
| CN205283241U (en) | Uninterruptible power supply system | |
| CN111313451A (en) | Medium-voltage direct-current power distribution network starting method based on half-bridge MMC | |
| US20220224225A1 (en) | Converter and on-board charger | |
| Nasiri et al. | Uninterruptible power supplies | |
| CN202712946U (en) | UPS charging module device | |
| CN201319509Y (en) | Full digital control three-phase input and output power frequency online UPS power supply | |
| CN204258300U (en) | Supplying power allocation safeguards system | |
| CN202817886U (en) | Uninterruptible power source | |
| CN102522813A (en) | Photovoltaic power generation voltage stabilizer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Tao Inventor after: Yu Wei Inventor after: Xu Haibo Inventor after: Su Jianhui Inventor after: Jasmine Inventor after: Zhang Liuchen Inventor before: Zhang Tao Inventor before: Yu Wei Inventor before: Xu Haibo |
|
| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20160601 Assignee: Guangdong Rongtong Financial Leasing Co.,Ltd. Assignor: EAST GROUP Co.,Ltd. Contract record no.: X2022980014040 Denomination of invention: Uninterruptible power supply system and control method thereof Granted publication date: 20190212 License type: Exclusive License Record date: 20220905 |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Uninterruptible power supply system and control method thereof Effective date of registration: 20220907 Granted publication date: 20190212 Pledgee: Guangdong Rongtong Financial Leasing Co.,Ltd. Pledgor: EAST GROUP Co.,Ltd. Registration number: Y2022980014695 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20231101 Granted publication date: 20190212 Pledgee: Guangdong Rongtong Financial Leasing Co.,Ltd. Pledgor: EAST GROUP Co.,Ltd. Registration number: Y2022980014695 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: Guangdong Rongtong Financial Leasing Co.,Ltd. Assignor: EAST GROUP Co.,Ltd. Contract record no.: X2022980014040 Date of cancellation: 20231124 |
|
| EC01 | Cancellation of recordation of patent licensing contract |