CN104753140A - Double-T-shaped three-level online UPS (uninterrupted power supply) - Google Patents
Double-T-shaped three-level online UPS (uninterrupted power supply) Download PDFInfo
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- CN104753140A CN104753140A CN201510164265.XA CN201510164265A CN104753140A CN 104753140 A CN104753140 A CN 104753140A CN 201510164265 A CN201510164265 A CN 201510164265A CN 104753140 A CN104753140 A CN 104753140A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a double-T-shaped three-level online UPS (uninterrupted power supply) which comprises a three-phase input end, an input filter circuit, an output filter circuit, an input static switch, a three-phase T-shaped three-level rectifier, a three-phase T-shaped three-level inverter, a direct current bus, two battery packs and control static switches used for controlling the battery packs. Phases of the three-phase input end are sequentially connected with the input filter circuit and the input static switch and then connected in the three-phase T-shaped three-level rectifier which is parallelly connected with the three-phase T-shaped three-level inverter through the direct-current bus, one of the battery packs is parallelly connected between an anode of the direct current bus and a null line of the three-phase input end through one control static switch, the other battery pack is parallelly connected between a cathode of the direct current bus and the null line of the three-phase input end through the other control static switch, and the three-phase T-shaped three-level inverter outputs through the output filter circuit. By the double-T-shaped three-level online UPS, input power factor can be increased, and total harmonic distortion degree of output voltage can be lowered.
Description
Technical field
The present invention relates to ups power, be specifically related to a kind of double-T shaped three level on line type UPS power supply.
Background technology
In the high power UPS power supply that current three-phase is online, conventional main circuit structure is divided into two kinds of main circuit frame modes: uncontrollable rectifier device (diode rectification) and two level three-phase inverters combine, controlled rectification (silicon controlled rectifier) combines with three-phase bridge two-level inverter.Due to diode and silicon controlled nonlinear characteristic, cause UPS Harmonics of Input large, input power factor is low, badly influences power grid quality; Two conventional level bridge-type inverters, direct control IGBT pipe carries out sinusoidal pulse width modulation (SPWM) to DC bus, inversion sine wave output voltage, because only producing two level (generating positive and negative voltage), so the total harmonic wave of inverter output voltage (THD) distortion factor is large, cause output filter requirement higher, and DC bus voltage is directly added on the single tube of IGBT, need select withstand voltage higher IGBT, cost is high.
Summary of the invention
Technical problem to be solved by this invention, was just to provide a kind of double-T shaped three level on line type UPS power supply, and can improves input power factor, reduced output voltage total harmonic distortion rate.
For solving the problems of the technologies described above, the technical scheme that the present invention takes is as follows:
A kind of double-T shaped three level on line type UPS power supply, comprise three-phase input end, input filter circuit, output filter circuit, input static switch, the T-shaped three-level rectifier of the three-phase be made up of IGBT pipe, the T-shaped three-level inverter of the three-phase be made up of IGBT pipe, DC bus, two battery pack and the control static switch for controlling battery pack, the each of three-phase input end connects input filter circuit mutually separately successively, the T-shaped three-level rectifier of three-phase is accessed after input static switch, the T-shaped three-level rectifier of three-phase is in parallel by DC bus with the T-shaped three-level inverter of three-phase, the input of the T-shaped three-level rectifier of every phase three-phase and every phase three-phase T-shaped three-level inverter output are all on respective three level mid point, wherein a battery pack controls static switch by one and is connected in parallel between the zero line that DC bus positive pole and three-phase input, and another battery pack is connected in parallel between the zero line that DC bus negative pole and three-phase input by another control static switch, the T-shaped three-level inverter of three-phase exports through output filter circuit.
Preferably, described input filter circuit comprises the first inductance, the second inductance and the first electric capacity, first inductance and the second inductance are serially connected between a wherein phase of three-phase input end and input static switch, one end of first electric capacity is connected to the tie point of the first inductance and the second inductance, and the other end of the first electric capacity is connected with the zero line of three-phase input end.
Preferably, the first Hall current sensor is serially connected with between described second inductance and input static switch.
Preferably, described output filter circuit comprises the 3rd inductance, the 4th inductance and the second electric capacity, 3rd inductance and the 4th inductance are serially connected with the output of the T-shaped three-level inverter of three-phase, one end of second electric capacity is connected to the tie point of the 3rd inductance and the 4th inductance, and the other end of the second electric capacity is connected with the zero line of three-phase input end.
Preferably, wherein a positive interpolar controlling static switch and DC bus is serially connected with one second Hall current sensor, is serially connected with another the second Hall current sensor between the negative pole of another control static switch and DC bus.
The present invention is compared to the beneficial effect of prior art:
The present invention is added on two IGBT pipes of the T-shaped three-level rectifier of three-phase and the T-shaped three-level inverter of three-phase by DC bus generating positive and negative voltage respectively, then the withstand voltage of IGBT pipe can be chosen by the half of DC bus voltage, this main circuit is adopted to carry out rectification, input input power factor can be made to bring up to close to 1, greatly reducing the pollution to power grid quality, output voltage total harmonic distortion rate (THD) can control to less than 5%.
Accompanying drawing explanation
Fig. 1 is the connection diagram of the present invention's double-T shaped three level on line type UPS power supply.
Embodiment
A kind of double-T shaped three level on line type UPS power supply as shown in Figure 1, comprise three-phase input end Lin_A, Lin_B, Lin_C, input filter circuit, output filter circuit, input static switch T1, T2, T3, the T-shaped three-level rectifier of the three-phase be made up of IGBT pipe, the T-shaped three-level inverter of the three-phase be made up of IGBT pipe, DC bus BUS+, BUS-, two battery pack BT1, BT2 and for controlling battery pack BT1, the control static switch T4 of BT2, T5, three-phase input end Lin_A, Lin_B, the each of Lin_C connects input filter circuit mutually separately successively, input static switch T1, T2, the T-shaped three-level rectifier of three-phase is accessed after T3, the T-shaped three-level rectifier of three-phase and the T-shaped three-level inverter of three-phase are by DC bus BUS+, BUS-is in parallel, the input of the T-shaped three-level rectifier of every phase three-phase and every phase three-phase T-shaped three-level inverter output are all on respective three level mid point, wherein a battery pack BT1 controls static switch T4 by one and is connected in parallel between the zero line N that DC bus positive pole BUS+ and three-phase input, and another battery pack BT2 is connected in parallel between the zero line N that DC bus negative pole BUS-and three-phase input by another control static switch T5, the T-shaped three-level inverter of three-phase exports through output filter circuit.
As preferred embodiment, input filter circuit comprises the first inductance L g1, Lg2, Lg3, the second inductance L 1, L2, L3 and first electric capacity C1, C2, C3, first inductance and the second inductance are serially connected between a wherein phase of three-phase input end and input static switch T1, T2, T3, one end of first electric capacity is connected to the tie point of the first inductance and the second inductance, and the other end of the first electric capacity is connected with the zero line N of three-phase input end.
As preferred embodiment, the second inductance L 1, L2, L3 and be serially connected with first Hall current sensor H1, H2, H3 between input static switch T1, T2, T3.
As preferred embodiment, output filter circuit comprises the 3rd inductance L o1, Lo2, Lo3, the 4th inductance L oA, LoB, LoC and second electric capacity Co1, Co2, Co3,3rd inductance and the 4th inductance are serially connected with the output of the T-shaped three-level inverter of three-phase, one end of second electric capacity is connected to the tie point of the 3rd inductance and the 4th inductance, and the other end of the second electric capacity is connected with the zero line N of three-phase input end.
As preferred embodiment wherein a positive interpolar controlling static switch and DC bus be serially connected with one second Hall current sensor H4, be serially connected with another second Hall current sensor H5 between another negative pole controlling static switch and DC bus.
The present invention adopts T-shaped three level IGBT module (the T-shaped tri-level circuit be made up of IGBT pipe), each inductance and each electric capacity to form three-phase four-wire system IGBT rectifier and inverter, adopt bidirectional triode thyristor composition electrical network input control circuit and charge-discharge control circuit, composition three-phase four-wire system on line type UPS power supply.Due to the T-shaped IGBT module that the T-shaped three-level rectifier of three-phase and the T-shaped three-level inverter of three-phase adopt, upper pipe knee-joint DC bus positive pole, lower pipe knee-joint DC bus negative pole, transverse tube knee-joint electrical network zero line is DC bus ground wire altogether, the input of the T-shaped three-level rectifier of every phase three-phase and three-phase T-shaped three-level inverter output are all on the mid point of T-shaped IGBT module, positive level is exported when upper pipe arm is opened, negative level is exported when lower pipe arm is opened, corresponding upper and lower transverse tube arm exports zero level when opening, the T-shaped three-level rectifier of three-phase and the T-shaped three-level inverter of three-phase are all operated in the pattern of three level.Because DC bus generating positive and negative voltage is added on two IGBT pipes respectively, then the withstand voltage of IGBT pipe can be chosen by the half of DC bus voltage.Adopt the present invention to carry out rectification, input input power factor can be made to bring up to close to 1, greatly reducing the pollution to power grid quality, output voltage total harmonic distortion rate (THD) can control to less than 5%.Wherein, control static switch to be connected by corresponding crystal drive circuit with three level IGBT module.
As in Fig. 1, three-phase input end Lin_A, Lin_B, Lin_C, respectively after the input filter circuit LCL filtering of correspondence, are added on each phase mid point of the T-shaped three-level rectifier of three-phase through input static switch T1, T2, T3.DSP control algolithm produces SPWM and drives four of every mutually T-shaped IGBT module inside to work by all means, makes it be operated in positive level, under the state of negative level and zero level three level.DSP passes through SPWM Duty ratio control, and the voltage on DC bus is raised to ± 440V, controls to carry out digital servo-control to input by algorithm; Adopt first current Hall transducer H1, H2, H3 to calculate the collection of three-phase input current signal respectively, input current total harmonic distortion rate (THDI) is controlled below 5%, and power factor controlling is more than 0.99.
As in Fig. 1, DC bus one tunnel is through controlling static switch T4, T5 to batteries charging, second current Hall transducer H4, H5 is adopted to carry out current acquisition to the positive and negative electrode of battery pack respectively, control the given voltage of DC bus BUS+, BUS-by DSP algorithm, reach battery pack constant current charge; Another road inputs as the direct current of the T-shaped three-level inverter of three-phase, the mid point of each mutually T-shaped three level IGBT module is that the T-shaped three-level inverter of three-phase exports, the same with the T-shaped three-level rectifier of three-phase, DSP is according to the sampling parameter of output voltage signal, export SPWM and drive ripple, under four IGBT controlling every mutually T-shaped three level IGBT module are operated in three level mould state, regulate duty ratio that output voltage waveforms is controlled to be less than 3% in total harmonic distortion rate (THD) value by algorithm.
Ups power of the present invention is simple for structure, and practicality is high, input, export the quality of power supply high, cost is lower.
Above-described embodiment is only preferred embodiment of the present invention, is not used for limiting practical range of the present invention; I.e. all changes of doing according to content of the present invention and modification, all by the claims in the present invention scope required for protection is contained.
Claims (5)
1. a double-T shaped three level on line type UPS power supply, it is characterized in that: comprise three-phase input end, input filter circuit, output filter circuit, input static switch, the T-shaped three-level rectifier of the three-phase be made up of IGBT pipe, the T-shaped three-level inverter of the three-phase be made up of IGBT pipe, DC bus, two battery pack and the control static switch for controlling battery pack, the each of three-phase input end connects input filter circuit mutually separately successively, the T-shaped three-level rectifier of three-phase is accessed after input static switch, the T-shaped three-level rectifier of three-phase is in parallel by DC bus with the T-shaped three-level inverter of three-phase, the input of the T-shaped three-level rectifier of every phase three-phase and every phase three-phase T-shaped three-level inverter output are all on respective three level mid point, wherein a battery pack controls static switch by one and is connected in parallel between the zero line that DC bus positive pole and three-phase input, and another battery pack is connected in parallel between the zero line that DC bus negative pole and three-phase input by another control static switch, the T-shaped three-level inverter of three-phase exports through output filter circuit.
2. double-T shaped three level on line type UPS power supply according to claim 1, it is characterized in that: described input filter circuit comprises the first inductance, the second inductance and the first electric capacity, first inductance and the second inductance are serially connected between a wherein phase of three-phase input end and input static switch, one end of first electric capacity is connected to the tie point of the first inductance and the second inductance, and the other end of the first electric capacity is connected with the zero line of three-phase input end.
3. double-T shaped three level on line type UPS power supply according to claim 2, is characterized in that: be serially connected with the first Hall current sensor between described second inductance and input static switch.
4. double-T shaped three level on line type UPS power supply according to claim 1, it is characterized in that: described output filter circuit comprises the 3rd inductance, the 4th inductance and the second electric capacity, 3rd inductance and the 4th inductance are serially connected with the output of the T-shaped three-level inverter of three-phase, one end of second electric capacity is connected to the tie point of the 3rd inductance and the 4th inductance, and the other end of the second electric capacity is connected with the zero line of three-phase input end.
5. the double-T shaped three level on line type UPS power supply according to any one of Claims 1 to 4, it is characterized in that: wherein a positive interpolar controlling static switch and DC bus is serially connected with one second Hall current sensor, between the negative pole of another control static switch and DC bus, be serially connected with another the second Hall current sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510164265.XA CN104753140A (en) | 2015-04-07 | 2015-04-07 | Double-T-shaped three-level online UPS (uninterrupted power supply) |
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| CN201510164265.XA CN104753140A (en) | 2015-04-07 | 2015-04-07 | Double-T-shaped three-level online UPS (uninterrupted power supply) |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071524A (en) * | 2015-08-10 | 2015-11-18 | 佛山市柏克新能科技股份有限公司 | UPS control system |
| CN106712156A (en) * | 2016-10-19 | 2017-05-24 | 佛山市柏克新能科技股份有限公司 | Multi-energy-converted inversion device and control method thereof |
| WO2021218266A1 (en) * | 2020-04-30 | 2021-11-04 | 华为数字能源技术有限公司 | Alternating-current power supply circuit, control method therefor, and alternating-current power supply |
| WO2023098027A1 (en) * | 2021-11-30 | 2023-06-08 | 广东志成冠军集团有限公司 | Method and system for predicting electrical state quantity of uninterruptible power supply (ups) system, and ups system control method and ups system |
| CN117155138A (en) * | 2023-10-31 | 2023-12-01 | 胜利油田海洋电气有限责任公司 | Three-level four-quadrant frequency converter and control method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001051A (en) * | 2006-01-12 | 2007-07-18 | 力博特公司 | Output-less transistor UPS |
| CN102723744A (en) * | 2011-03-29 | 2012-10-10 | 力博特公司 | UPS module and UPS system |
| CN102790422A (en) * | 2012-07-30 | 2012-11-21 | 广东易事特电源股份有限公司 | Uninterrupted power supply (UPS) charging module device and control method thereof |
| CN103187785A (en) * | 2011-12-27 | 2013-07-03 | 力博特公司 | UPS module and UPS system |
| CN103368231A (en) * | 2013-07-05 | 2013-10-23 | 华为技术有限公司 | Uninterruptible power supply circuit |
| CN103944433A (en) * | 2014-04-29 | 2014-07-23 | 华为技术有限公司 | Three-phase three-level inverter circuit and uninterruptible power supply |
| CN204578144U (en) * | 2015-04-07 | 2015-08-19 | 佛山市柏克新能科技股份有限公司 | A kind of double-T shaped three level on line type UPS power supply |
-
2015
- 2015-04-07 CN CN201510164265.XA patent/CN104753140A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001051A (en) * | 2006-01-12 | 2007-07-18 | 力博特公司 | Output-less transistor UPS |
| CN102723744A (en) * | 2011-03-29 | 2012-10-10 | 力博特公司 | UPS module and UPS system |
| CN103187785A (en) * | 2011-12-27 | 2013-07-03 | 力博特公司 | UPS module and UPS system |
| CN102790422A (en) * | 2012-07-30 | 2012-11-21 | 广东易事特电源股份有限公司 | Uninterrupted power supply (UPS) charging module device and control method thereof |
| CN103368231A (en) * | 2013-07-05 | 2013-10-23 | 华为技术有限公司 | Uninterruptible power supply circuit |
| CN103944433A (en) * | 2014-04-29 | 2014-07-23 | 华为技术有限公司 | Three-phase three-level inverter circuit and uninterruptible power supply |
| CN204578144U (en) * | 2015-04-07 | 2015-08-19 | 佛山市柏克新能科技股份有限公司 | A kind of double-T shaped three level on line type UPS power supply |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071524A (en) * | 2015-08-10 | 2015-11-18 | 佛山市柏克新能科技股份有限公司 | UPS control system |
| CN105071524B (en) * | 2015-08-10 | 2018-01-09 | 佛山市柏克新能科技股份有限公司 | Ups power control system |
| CN106712156A (en) * | 2016-10-19 | 2017-05-24 | 佛山市柏克新能科技股份有限公司 | Multi-energy-converted inversion device and control method thereof |
| WO2021218266A1 (en) * | 2020-04-30 | 2021-11-04 | 华为数字能源技术有限公司 | Alternating-current power supply circuit, control method therefor, and alternating-current power supply |
| WO2023098027A1 (en) * | 2021-11-30 | 2023-06-08 | 广东志成冠军集团有限公司 | Method and system for predicting electrical state quantity of uninterruptible power supply (ups) system, and ups system control method and ups system |
| CN117155138A (en) * | 2023-10-31 | 2023-12-01 | 胜利油田海洋电气有限责任公司 | Three-level four-quadrant frequency converter and control method thereof |
| CN117155138B (en) * | 2023-10-31 | 2024-01-12 | 胜利油田海洋电气有限责任公司 | Three-level four-quadrant frequency converter and control method thereof |
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Application publication date: 20150701 |