CN205283241U - Uninterruptible power supply system - Google Patents

Uninterruptible power supply system Download PDF

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Publication number
CN205283241U
CN205283241U CN201521061369.XU CN201521061369U CN205283241U CN 205283241 U CN205283241 U CN 205283241U CN 201521061369 U CN201521061369 U CN 201521061369U CN 205283241 U CN205283241 U CN 205283241U
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CN
China
Prior art keywords
load
current
uninterruptible power
idle
monitor signal
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Withdrawn - After Issue
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CN201521061369.XU
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Chinese (zh)
Inventor
张涛
徐海波
马强
龚兵辉
郭蕾
苏建徽
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East Group Co Ltd
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East Group Co Ltd
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Priority to CN201521061369.XU priority Critical patent/CN205283241U/en
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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
    • 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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Abstract

The utility model relates to an uninterruptible power supply system, including the battery, still include: the observation circuit for whether the monitoring commercial power is normal, and just often exports first monitor signal at the commercial power, output second monitor signal when the commercial power is unusual, controllable switch, controllable switch's input is used for and mains connection, and controllable switch's output passes through the common connecting point and is connected with the load, controllable switch's control end and monitoring circuit connection, and the converter, controllable switch switches on under the control of first monitor signal, disconnection under the control of second monitor signal, the converter carries out idle and harmonic compensation under the control of first monitor signal, the converter output current under the control of second monitor signal normally work for the load. Above -mentioned uninterruptible power supply system's efficiency index is higher and can satisfy load continued work's power demand.

Description

Uninterruptible power system
Technical field
This utility model relates to power grid control field, particularly relates to a kind of uninterruptible power system.
Background technology
Along with the quick of data center power sources load increases in recent years, energy efficiency indexes requires more and more higher. Corresponding to the uninterruptible power system (UninterruptiblePowerSystem, UPS) of high-density data center, not only powering for information technoloy equipment, to be also ensure that the auxiliary equipment such as air-conditioning etc. that information technoloy equipment runs is powered, power supply requirement continues to increase. Traditional data center's power supply mode is generally adopted the on line type UPS power supply based on double; two converter techniques. Major downside is that of on line type UPS powers the electric energy loss under environment relatively greatly at forceful electric power net, and operating cost is high, therefore can not meet the demand that data center's high-quality is powered.
Utility model content
Based on this, it is necessary to provide a kind of energy efficiency index higher and disclosure satisfy that the uninterruptible power system of load continuous work power demands.
A kind of uninterruptible power system, including accumulator, also includes: observation circuit, is used for whether normally monitoring civil power, and exports the first monitor signal when described civil power is normal, exports the second monitor signal when city's electrical anomaly; Gate-controlled switch, including input, outfan and control end; The input of described gate-controlled switch is for electrically connecting with city, and the outfan of described gate-controlled switch is connected with load by points of common connection; The control end of described gate-controlled switch is connected with described observation circuit; And current transformer, it is connected between described points of common connection and described accumulator; Described gate-controlled switch turns under the control of described first monitor signal, disconnects under the control of described second monitor signal; Described current transformer exports idle and harmonic compensation current to carry out idle and harmonic compensation according to the idle and harmonic component in load current under the control of described first monitor signal; Described current transformer exports electric current for load normal operation under the control of described second monitor signal.
Wherein in an embodiment, described current transformer includes idle and harmonic wave current extracting circuit; Described idle and harmonic wave current extracting circuit includes the DC quantity change-over circuit, low pass filter, first-harmonic amount change-over circuit and the subtraction device that are sequentially connected with; The input of described DC quantity change-over circuit is connected with points of common connection; The input of described DC quantity change-over circuit is also connected with the input of described subtraction device; Described DC quantity change-over circuit is for receiving load current and load current converting to the DC quantity containing low-frequency ripple; Described low pass filter is for being filtered the described DC quantity with low-frequency ripple; Described first-harmonic amount change-over circuit is for converting the DC quantity after filtration to load current fundametal compoment; Described subtraction device obtains idle and harmonic wave compensation current for described load current fundametal compoment deducts load current; Described current transformer is according to described idle and harmonic wave compensation current output compensating instruction value; Described accumulator is additionally operable to according to described compensating instruction value, the DC side of described current transformer be powered, so that described current transformer output idle and harmonic compensation current accordingly is to points of common connection.
Wherein in an embodiment, described current transformer is two way convertor; Described observation circuit is additionally operable to the voltage to described accumulator or residual capacity carries out monitoring output voltage values or remaining capacity value in real time; Described uninterruptible power system also includes comparison circuit; Described comparison circuit is connected with described observation circuit, described two way convertor respectively; Described comparison circuit is used for judging that whether described magnitude of voltage or described remaining capacity value are lower than preset value, and controls described two way convertor when described magnitude of voltage or described remaining capacity value are lower than preset value and transferred to rectification state by inverter mode described accumulator is charged.
Wherein in an embodiment, described comparison circuit includes comparator; The first input end of described comparator is connected with described observation circuit, is used for receiving described magnitude of voltage or described remaining capacity value; Second input of described comparator is as the reference voltage or with reference to residual capacity input; The outfan of described comparator is connected with described two way convertor.
Wherein in an embodiment, by the three-phase voltage of civil power carries out monitoring in real time, described observation circuit judges that whether civil power is normal.
Wherein in an embodiment, also include reactor; The input of described reactor is connected with the outfan of described gate-controlled switch; The outfan of described reactor is for being connected with load.
Wherein in an embodiment, also include by-pass switch; Described by-pass switch is connected with civil power, load respectively; Described by-pass switch is for turning on thus directly being powered to the load by civil power when described uninterruptible power system needs to keep in repair.
Above-mentioned uninterruptible power system, can when civil power is normal by mains-supplied and by current transformer according to the idle and harmonic component in load current export idle with harmonic compensation current to carry out idle and harmonic compensation, thus the PCC point quality of power supply is improved, and then there is higher energy efficiency index. And when city's electrical anomaly, gate-controlled switch disconnects powers to current transformer DC side thereby through accumulator, it is ensured that load still is able to normal operation under the power supply of uninterruptible power system when city's electrical anomaly, stability is better, it is possible to meet the power demands of load continuous work.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of the uninterruptible power system in an embodiment;
Fig. 2 is the theory diagram of the idle and harmonic wave current extracting circuit in the current transformer in Fig. 1;
Fig. 3 is the schematic diagram that the PCC point quality of power supply is improved when being incorporated into the power networks by the uninterruptible power system in Fig. 1;
The uninterrupted system that Fig. 4 is in Fig. 1 is switched to effect schematic diagram during off-network mode of operation by grid-connected mode of operation.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, this utility model is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain this utility model, be not used to limit this utility model.
Fig. 1 is the circuit block diagram of the uninterruptible power system in an embodiment, and this uninterruptible power system includes accumulator 110, observation circuit 120, gate-controlled switch 130 and current transformer 140.
Accumulator 110 is used for storing electric energy, such that it is able to outwards output electric energy carries out normal operation with supply load. The battery types that accumulator 110 can adopt uninterruptible power system field conventional realizes.
Observation circuit 120 is for being monitored civil power, thus judging that whether civil power is normal according to monitoring situation. Specifically, observation circuit 120 judges that whether civil power is normal by the three-phase voltage of civil power is monitored. In the present embodiment, civil power is just referring to the voltage of civil power and is being in steady statue, sharply change (in the short time, voltage has bigger lifting or decline) will not occur and can normally export and be powered to load; City's electrical anomaly then refers to that the voltage of civil power plays pendulum or interrupts (namely can not normally export powering load) state. Observation circuit 120 exports the first monitor signal when monitoring civil power and being normal, and exports the second monitor signal when city's electrical anomaly.
Gate-controlled switch 130 is connected between civil power and load, for controlling the connection between civil power and load. Specifically, gate-controlled switch 130 includes input, outfan and control end. The input of gate-controlled switch 130 electrically connects with city. The outfan of gate-controlled switch 130 is connected with load by points of common connection (PCC). The control end of gate-controlled switch 130 is then connected with observation circuit 120. Gate-controlled switch 130 is for receiving the first monitor signal and second monitor signal of observation circuit 120 output, and operates accordingly according to the monitor signal received. Gate-controlled switch 130 turns on when receiving the first monitor signal, so that civil power is connected with load, civil power powers to the load. Now uninterruptible power system enters grid-connected mode of operation. Gate-controlled switch 130 disconnects when receiving the second monitor signal, thus the connection disconnected between civil power and load, it is to avoid the harm that load is caused by city's electrical anomaly. Now uninterruptible power system enters off-network mode of operation.
Current transformer 140 is connected between PCC point and accumulator 110. Current transformer 140 is for processing the output of accumulator 110, and output is controlled by the monitoring result according to observation circuit 120. Specifically, current transformer 140 under the control of the first monitor signal according to load current iloadIn the output of idle and harmonic component is idle and harmonic compensation current improves with the quality of power supply to PCC point place, thus offsetting PCC point load current iloadIn idle and harmonic (load current iloadGenerally can be analyzed to fundamental current iUPSfReactive current i is added with harmonic waveUPSh, it may be assumed that iload=iUPSf+iUPSh), finally make mains current igridContaining only there being real component, it is thus eliminated that idle and harmonic wave Current on Grid harm, it is possible to make the quality of power supply of points of common connection PCC be improved preferably and then improve the energy efficiency index of electrical network. And by idle and harmonic compensation, the load current i of PCC pointloadWaveform becomes pure sine wave, and phase current can be consistent with phase current potential, therefore also improves the power supply quality of load to a certain extent. In the present embodiment, current transformer 140 is provided with idle and harmonic wave current extracting circuit, is used for extracting load current iloadIn idle and harmonic wave current value. Fig. 2 is the theory diagram of the idle and harmonic wave current extracting circuit in current transformer 140. Referring to Fig. 2, idle and harmonic wave current extracting circuit includes DC quantity change-over circuit 210, low pass filter 220, first-harmonic amount change-over circuit 230 and subtraction device 240. Wherein, DC quantity change-over circuit 210, low pass filter 220, first-harmonic amount change-over circuit 230 and subtraction device 240 are sequentially connected with. The input of DC quantity change-over circuit 210 is connected with PCC point. The input of DC quantity change-over circuit 210 is also connected with the input of subtraction device 240. Specifically, load current iloadFirst pass through DC quantity change-over circuit 210 and load current is converted to the DC quantity I containing low-frequency rippleloadh, it is filtered into pure DC quantity I again through low pass filter 220load. Then the effect of first-harmonic amount change-over circuit 230 is by DC quantity IloadConvert load current fundametal compoment i toUPSf, fundametal compoment i in final load electric currentUPSfLoad current i is deducted by the effect of subtraction device 240loadObtain the idle and harmonic wave compensation current needing to compensate, it may be assumed that
iUPSf-iload=iUPSf-(iUPSf+iUPSh)=-iUPSh��
Current transformer 140 has only to-iUPShInject electrical network and PCC point load current iloadIn idle and harmonic wave current segment iUPShOffset, and then PCC point load current i can be realizedloadEffect with the voltage sinusoidal of PCC point, unity power factor.
Fig. 3 is the schematic diagram that the PCC point quality of power supply is improved when being incorporated into the power networks by uninterruptible power system. At t0Before moment, uninterruptible power system is not connected to the grid, by civil power powering load, load current iloadEqual to mains current igrid, i.e. iload=igrid. Now, the civil power quality of power supply is poor, and containing harmonic wave in the electric current of a certain phase of load, wave distortion is comparatively serious, simultaneously the phase voltage leading load phase current of this phase of PCC point place, and namely in load current, idle component is also relatively larger. At t0In the moment, uninterruptible power system puts into, and is connected to the grid, and current transformer 140 exports idle and harmonic compensation current and PCC point is carried out idle and harmonic compensation, but it does not export watt current. Now load current iloadMains current i before grid-connected equal to UPSgrid(UPS grid-connected before, mains current igrid=iload=iUPSf+iUPSh) and uninterruptible power system grid-connected after compensation electric current iUPS(iUPS=-iUPSh) sum, namely
igrid+iUPS=(iUPSf+iUPSh)+(-iUPSh)=iUPSf��
Therefore after compensating, the load current i of PCC pointloadThe phase place that waveform becomes pure sinusoid, phase current and phase voltage is consistent. Uninterruptible power system output electric current iUPSCounteract i in load currentloadIdle and harmonic so that the grid-connected rear mains current i of UPSgridContaining only there being real component, decreasing idle and harmonic current flowing in electrical network, thus well completing the function improving the PCC point quality of power supply, and then improve the energy efficiency index of electrical network.
In one embodiment, observation circuit 120 is additionally operable to the voltage to accumulator 110 or residual capacity carries out monitoring output voltage values or remaining capacity value in real time. In the present embodiment, current transformer 140 is two way convertor; Uninterruptible power system also includes comparison circuit (not shown). Comparison circuit is connected with observation circuit 120, current transformer 140 respectively. Comparison circuit is for receiving the magnitude of voltage of observation circuit output or capacitance and judging that whether magnitude of voltage that observation circuit 120 export or remaining capacity value are lower than preset value, and control current transformer 140 is transferred to rectification state by inverter mode accumulator 110 is charged when lower than preset value. When magnitude of voltage or remaining capacity value are more than or equal to preset value, then current transformer 140 does not charge to accumulator 110. In one embodiment, magnitude of voltage and remaining capacity value can also be monitored by observation circuit 120 simultaneously, thus any one in the two lower than preset value or both lower than preset value time control current transformer 140 accumulator 110 be charged.
Referring to Fig. 1, current transformer 140 is additionally operable to when receiving the second monitor signal, namely during city's electrical anomaly, is adjusted with output load current the output of accumulator 110 for load normal operation. Now, uninterruptible power system enters off-network mode of operation. Above-mentioned uninterruptible power system can switch seamlessly to off-network mode of operation from grid-connected mode of operation. In one embodiment, for guarantee important load can normal operation, when off-network mode of operation, important load can be only powered by uninterruptible power system, and stops to insignificant load supplying.
Fig. 4 is that uninterrupted system is switched to effect schematic diagram during off-network mode of operation by grid-connected mode of operation, at t0Before moment, ups power system grid connection is run, city supply electricity to important load and power; Current transformer 140 charges from civil power power taking to accumulator 110 simultaneously, i.e. igrid=iload+iUPS. Due to the charging current i being charged to accumulatorUPSOnly small, the therefore load current i of PCC point outputloadNo better than mains current igrid. At t0In the moment, uninterruptible power system switches to off-network mode of operation, mains current i from grid-connected mode of operationgridBeing zero, current transformer 140 is switched to inversion duty from charged state, by accumulator 110 through current transformer 140 powering load, now load current iloadIt is equal to UPS and exports electric current iUPS ��, i.e. iload=iUPS ����
When line voltage recovers normal, gate-controlled switch 130 will turn on again, by civil power powering load, and carry out idle and harmonic compensation according to loading demand, improve the quality of power supply of PCC point.
Above-mentioned uninterruptible power system, can when civil power is normal by mains-supplied and by current transformer 140 according to the idle and harmonic component in load current export idle with harmonic current to carry out idle and harmonic compensation, it is thus possible to improve the quality of power supply of points of common connection, and then there is higher energy efficiency index. And when city's electrical anomaly, gate-controlled switch 130 disconnects powers to current transformer DC side thereby through accumulator 110, it is ensured that load still is able to normal operation when city's electrical anomaly, and stability is better, it is possible to meet the power demands of load continuous work.
Referring to Fig. 1, above-mentioned uninterruptible power system also includes reactor 150 and by-pass switch 160. Wherein, reactor 150 is connected between gate-controlled switch 130 and load, and the outfan of current transformer 140 is connected between reactor 150 and load. Reactor 150 is for leaving civil power and load isolation, it is ensured that the sineization of grid side electric current. By-pass switch 160 is connected between load and civil power, for the conducting when uninterruptible power system needs to keep in repair thus directly being powered to the load by civil power, it is ensured that during uninterruptible power system exception, load still is able to normal operation.
In one embodiment, above-mentioned uninterruptible power system also includes control circuit. Control circuit user obtains the severity level accessing load, and power supply electric energy is allocated by the severity level according to each load. Specifically, control circuit can carry out long-term and short-term prediction according to the electricity consumption situation of important load, thus energy is allocated, to guarantee that important load can continuous firing.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics is absent from contradiction, all it is considered to be the scope that this specification is recorded.
Embodiment described above only have expressed several embodiments of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope. It should be pointed out that, for the person of ordinary skill of the art, without departing from the concept of the premise utility, it is also possible to make some deformation and improvement, these broadly fall into protection domain of the present utility model. Therefore, the protection domain of this utility model patent should be as the criterion with claims.

Claims (7)

1. a uninterruptible power system, including accumulator, it is characterised in that also include:
Observation circuit, is used for whether normally monitoring civil power, and exports the first monitor signal when described civil power is normal, export the second monitor signal when city's electrical anomaly;
Gate-controlled switch, including input, outfan and control end; The input of described gate-controlled switch is for electrically connecting with city, and the outfan of described gate-controlled switch is connected with load by points of common connection; The control end of described gate-controlled switch is connected with described observation circuit; And
Current transformer, is connected between described points of common connection and described accumulator;
Described gate-controlled switch turns under the control of described first monitor signal, disconnects under the control of described second monitor signal; Described current transformer exports idle and harmonic compensation current to carry out idle and harmonic compensation according to the idle and harmonic component in load current under the control of described first monitor signal; Described current transformer exports electric current for load normal operation under the control of described second monitor signal.
2. uninterruptible power system according to claim 1, it is characterised in that described current transformer includes idle and harmonic wave current extracting circuit; Described idle and harmonic wave current extracting circuit includes the DC quantity change-over circuit, low pass filter, first-harmonic amount change-over circuit and the subtraction device that are sequentially connected with; The input of described DC quantity change-over circuit is connected with points of common connection; The input of described DC quantity change-over circuit is also connected with the input of described subtraction device;
Described DC quantity change-over circuit is for receiving load current and load current converting to the DC quantity containing low-frequency ripple;
Described low pass filter is for being filtered the described DC quantity with low-frequency ripple;
Described first-harmonic amount change-over circuit is for converting the DC quantity after filtration to load current fundametal compoment;
Described subtraction device obtains idle and harmonic wave compensation current for described load current fundametal compoment deducts load current; Described current transformer is according to described idle and harmonic wave compensation current output compensating instruction value;
Described accumulator is additionally operable to according to described compensating instruction value, the DC side of described current transformer be powered, so that described current transformer output idle and harmonic compensation current accordingly is to points of common connection.
3. uninterruptible power system according to claim 1, it is characterised in that described current transformer is two way convertor; Described observation circuit is additionally operable to the voltage to described accumulator or residual capacity carries out monitoring output voltage values or remaining capacity value in real time;
Described uninterruptible power system also includes comparison circuit; Described comparison circuit is connected with described observation circuit, described two way convertor respectively; Described comparison circuit is used for judging that whether described magnitude of voltage or described remaining capacity value are lower than preset value, and controls described two way convertor when described magnitude of voltage or described remaining capacity value are lower than preset value and transferred to rectification state by inverter mode described accumulator is charged.
4. uninterruptible power system according to claim 3, it is characterised in that described comparison circuit includes comparator; The first input end of described comparator is connected with described observation circuit, is used for receiving described magnitude of voltage or described remaining capacity value; Second input of described comparator is as the reference voltage or with reference to residual capacity input; The outfan of described comparator is connected with described two way convertor.
5. uninterruptible power system according to claim 1, it is characterised in that by the three-phase voltage of civil power carries out monitoring in real time, described observation circuit judges that whether civil power is normal.
6. uninterruptible power system according to claim 1, it is characterised in that also include reactor; The input of described reactor is connected with the outfan of described gate-controlled switch; The outfan of described reactor is for being connected with load.
7. uninterruptible power system according to claim 1, it is characterised in that also include by-pass switch; Described by-pass switch is connected with civil power, load respectively; Described by-pass switch is for turning on thus directly being powered to the load by civil power when described uninterruptible power system needs to keep in repair.
CN201521061369.XU 2015-12-16 2015-12-16 Uninterruptible power supply system Withdrawn - After Issue CN205283241U (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105406583A (en) * 2015-12-16 2016-03-16 易事特集团股份有限公司 Uninterrupted power system and control method thereof
CN107492946A (en) * 2016-06-12 2017-12-19 周锡卫 A kind of two-way controllable uninterruptible power system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105406583A (en) * 2015-12-16 2016-03-16 易事特集团股份有限公司 Uninterrupted power system and control method thereof
CN107492946A (en) * 2016-06-12 2017-12-19 周锡卫 A kind of two-way controllable uninterruptible power system

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