CN104333023A - UPS (Uninterruptible Power Supply) three-phase input current-sharing controller and UPS current-sharing control method - Google Patents
UPS (Uninterruptible Power Supply) three-phase input current-sharing controller and UPS current-sharing control method Download PDFInfo
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- CN104333023A CN104333023A CN201410605954.5A CN201410605954A CN104333023A CN 104333023 A CN104333023 A CN 104333023A CN 201410605954 A CN201410605954 A CN 201410605954A CN 104333023 A CN104333023 A CN 104333023A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention relates to the UPS (Uninterruptible Power Supply) system control technical field and particularly discloses a UPS three-phase input current-sharing controller and a UPS current-sharing control method. The UPS three-phase input current-sharing controller comprises an input voltage judgment device, an adjustment device and a PWM (Pulse Width Modulation) generator; the input voltage judgment device is used for performing real-time detection and judgment on the input voltage of a UPS and selecting the appropriate given voltage of the controller; the adjustment device is used for adjusting the output voltage of a boost converter; the PWM generator is used for converting the output voltage of the adjustment device into PWM signals; the real-time detection is performed on the input voltage and a direct current bus voltage value through the controller, a given output value of the boost converter is increased through the controller when any phase of input voltage is detected to exceed a certain range, and accordingly an input voltage peak value can be within the output voltage range of the boost converter. According to the UPS three-phase input current-sharing controller and the UPS current-sharing control method, the amplitude of the output voltage is judged to improve the bus voltage correspondingly so as to enable the three-phase input current-sharing effect to be achieved and accordingly the damage to the UPS due to the input non-current-sharing condition is avoided.
Description
Technical field
The present invention relates to ups system control technology field, particularly the current-sharing control method of a kind of UPS three-phase input equal current-sharing controller and UPS.
Background technology
Communication uninterrupted power supply (UPS) industry standard YD/T 1095-2008 requires as follows to the input voltage variable range of on line type UPS:
That is, UPS will reach 1 class standard, and the maximum of its input phase voltage needs to reach 275V.
In actual use, can there is certain deviation and unbalanced situation in the voltage of three phase network, and especially in some remote districts and rural area, the power of substation transformer was not very large originally, and the voltage ripple of power network in these areas can be larger.And along with the development of society, the power consumption equipment in these areas is increasing again fast, and major part is all single-phase load, that phase voltage making single-phase load connect like this due to load excessive thus dragged down, other two phase voltages are higher, thus cause three-phase power grid voltage may occur serious unbalanced situation.
When the three-phase input phase voltage of UPS is any one mutually excessive and when occurring uneven, can cause three-phase input current not current-sharing.When three-phase input current is serious uneven and the load capacity of UPS is larger, maximum that of electric current is crossed conference due to electric current and is caused the internal component of UPS to damage because the super rule of electric current.
Summary of the invention
For solving the problem; the invention provides a kind of UPS three-phase input equal current-sharing controller; it can detect the value of input voltage and DC bus-bar voltage in real time; and according to input voltage value regulation output magnitude of voltage; make input voltage within the control range of booster converter; keep three-phase to be in equal stream mode all the time, protection components and parts are not damaged.
The present invention also provides has the UPS device of above-mentioned three-phase equalizing controller and the current-sharing control method of this device.
For achieving the above object, the technical solution adopted in the present invention is:
A kind of UPS three-phase input equal current-sharing controller, it comprises: input voltage determining device, for detecting in real time the input voltage of UPS, judge, and the given voltage that selection control is suitable; Adjuster, for regulating the output voltage of booster converter; And PWM generator, for the output voltage of adjuster is converted to pwm signal.
A kind of UPS device, the three-phase input equal current-sharing controller described in its tool.
A kind of UPS three-phase input current-sharing control method, wherein UPS comprises rectifier, booster converter and controller, described controller comprises input voltage determining device, for detecting in real time the input voltage of UPS, judge, and the given voltage that selection control is suitable; Adjuster, for regulating the output voltage of booster converter; And PWM generator, for the output voltage of adjuster is converted to pwm signal; Input voltage determining device detects in real time to input voltage, when input voltage determining device detects that arbitrary phase input voltage exceedes certain limit, suitable given voltage is selected to booster converter, make input voltage peak value within the output voltage range of booster converter, avoid input voltage to fill with dc-link capacitance and cause inputting not current-sharing.
Described UPS three-phase inputs current-sharing control method specifically:
When detecting that the peak value of any phase input voltage is less than the output voltage Vdc of booster converter, using the given voltage of Vdc_ref0 as adjuster.
When detecting that the peak value of any phase input voltage is in output voltage Vdc to the K1*Vdc scope of booster converter, using given as adjuster of Vdc_ref1, the control signal of controller changes, and makes the output voltage of booster converter finally be stabilized in Vdc1, Vdc1=Vdc_ref1.
When detecting that the peak value of three-phase input voltage is less than Vdc, again using given as adjuster of Vdc_ref0, the control signal of controller changes, and makes the output voltage of booster converter finally be stabilized in Vdc, Vdc=Vdc_ref0.
When detecting that the peak value of any phase input voltage is in K1*Vdc to K2*Vdc scope, using given as adjuster of Vdc_ref2, the control signal of controller changes, and makes the output voltage of booster converter finally be stabilized in Vdc2, Vdc2=Vdc_ref2.
When detecting that the peak value of three-phase input voltage is in Vdc to K1*Vdc scope, again using given as adjuster of Vdc_ref1, the control signal of controller changes, and makes the output voltage of booster converter finally be stabilized in Vdc1, Vdc1=Vdc_ref1.
Preferably, described Vdc value is 360V when UPS nominal operation.
Preferably, described Vdc_ref0 value is 360V.
Preferably, described Vdc_ref1 value is 375V.
Preferably, described Vdc_ref2 value is 390V.
Preferably, described K1 value is 1.042.
Preferably, described K2 value is 1.083.
The current-sharing control method of UPS three-phase input equal current-sharing controller of the present invention and UPS, its beneficial effect is:
This controller has input voltage determining device, can detect arbitrary phase voltage of UPS and judge whether it is greater than output voltage Vdc value, adjuster carries out voltage-regulation for the set-point of the selection of input voltage determining device, avoids input voltage to be greater than output voltage, makes three-phase input current-sharing.
The current-sharing control method of UPS three-phase input equal current-sharing controller of the present invention and UPS, its beneficial effect is:
This control method, by judging that the amplitude of input voltage promotes busbar voltage accordingly and makes three-phase input current-sharing, is avoided causing UPS damage owing to inputting uneven conductance, is extended the useful life of UPS.
Accompanying drawing explanation
Fig. 1 is the structure chart of embodiment of the present invention ups system;
Fig. 2 is the structural representation of embodiment of the present invention UPS three-phase input equal current-sharing controller.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
Embodiment:
Please refer to Fig. 1, on line type UPS of the present invention, be made up of AC-DC rectifier, DC-DC boost converter and equalizing controller, during UPS nominal operation, its DC bus-bar voltage threshold value is Vdc, when the peak value inputting phase voltage is greater than Vdc, equalizing controller changes the set-point of booster converter, and DC bus-bar voltage is raised.
Under normal circumstances, the input voltage of booster circuit is less than output voltage, and output voltage stabilization can be made when such booster circuit normally works at Vdc.When the input voltage of booster circuit is greater than output voltage, output voltage does not just control by booster circuit, and now input voltage is directly poured on dc-link capacitance, and output voltage depends on the peak value of input voltage.
When three-phase input voltage is consistent and peak value is all greater than Vdc, three-phase input voltage all can fill with dc-link capacitance, and now three-phase input current depends on the impedance of three-phase input circuit, and when the impedance of three-phase input circuit is inconsistent, input current will be uneven.
When three-phase voltage peak value is less than Vdc, three-phase input can be made to keep current-sharing by software flow equalize technology; When occurring that input voltage fills with dc-link capacitance, DC bus-bar voltage is not controlled, and software sharing control just can not play a role.
When the arbitrary phase peak value of three-phase input voltage be greater than Vdc and imbalance of three-phase voltage time, its input current of that phase that input voltage is the highest is maximum, and its input current of that phase that input voltage is minimum is minimum, now can cause serious input not current-sharing.
Please refer to Fig. 2, UPS three-phase equalizing controller of the present invention, it comprises input voltage determining device, for detecting in real time the input voltage of UPS, judge, and the given voltage that selection control is suitable; Adjuster, for regulating the output voltage of booster converter; And PWM generator, for the output voltage of adjuster is converted to pwm signal.
The input voltage determining device of controller detects in real time to input voltage, when input voltage determining device detects that arbitrary phase input voltage exceedes certain limit, suitable given voltage is selected to booster converter, make input voltage peak value within the output voltage range of booster converter, avoid input voltage filling dc-link capacitance to cause inputting the phenomenon of not current-sharing.
Be operated in the probability of high voltage to reduce dc-link capacitance, what two grades or many grades can be divided into increase DC-DC boost converter exports to definite value, specific as follows:
When detecting that the peak value of any phase input voltage is less than the output voltage Vdc of DC-DC boost converter, using the given voltage of Vdc_ref0 as adjuster, Vdc value can be taken as 360V, and now Vdc_ref is 360V.
When detecting that the peak value of any phase input voltage is in output voltage Vdc to the 1.042Vdc scope of DC-DC boost converter, using given as controller of Vdc_ref1, the control signal of controller changes, make the output voltage of DC-DC boost converter finally be stabilized in Vdc1, now Vdc1=Vdc_ref1 is 375V.
When detecting that the peak value of three-phase input voltage is less than Vdc again, again using given as controller of Vdc_ref0, the control signal of controller changes, and makes the output voltage of DC-DC boost converter finally be stabilized in Vdc, and now Vdc=Vdc_ref0 is 360V.
When detecting that the peak value of any phase input voltage is in 1.042Vdc to 1.083Vdc scope, using given as controller of Vdc_ref2, the control signal of controller changes, make the output voltage of DC-DC boost converter finally be stabilized in Vdc2, now Vdc2=Vdc_ref2 is 390V.
When detecting that the peak value of three-phase input voltage is again in Vdc to 1.042Vdc scope, again using given as controller of Vdc_ref1, the control signal of controller changes, make the output voltage of DC-DC boost converter finally be stabilized in Vdc1, now Vdc1=Vdc_ref1 is 375V.
Illustrate:
When arbitrary phase input voltage is in 255-265V scope, busbar voltage is lifted to 375V; When arbitrary phase input voltage is in 265-275V scope, busbar voltage is lifted to 390V.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a UPS three-phase input equal current-sharing controller, is characterized in that, comprising: input voltage determining device, for detecting in real time the input voltage of UPS, judge, and the given voltage that selection control is suitable; Adjuster, for regulating the output voltage of booster converter; And PWM generator, for the output voltage of adjuster is converted to pwm signal.
2. a UPS device, is characterized in that: have three-phase input equal current-sharing controller according to claim 1.
3. a UPS three-phase input current-sharing control method, wherein UPS comprises rectifier, booster converter and controller, it is characterized in that: described controller comprises input voltage determining device, for detecting in real time the input voltage of UPS, judge, and the given voltage that selection control is suitable; Adjuster, for regulating the output voltage of booster converter; And PWM generator, for the output voltage of adjuster is converted to pwm signal;
Input voltage determining device detects in real time to input voltage, when input voltage determining device detects that arbitrary phase input voltage exceedes certain limit, suitable given voltage is selected to booster converter, make input voltage peak value within the output voltage range of booster converter, avoid input voltage to fill with dc-link capacitance and cause inputting not current-sharing.
4. UPS three-phase according to claim 3 input current-sharing control method, is characterized in that, control method specifically:
When detecting that the peak value of any phase input voltage is less than the output voltage Vdc of booster converter, using the given voltage of Vdc_ref0 as adjuster;
When detecting that the peak value of any phase input voltage is in output voltage Vdc to the K1*Vdc scope of booster converter, using given as adjuster of Vdc_ref1, the control signal of controller changes, and makes the output voltage of booster converter finally be stabilized in Vdc1, Vdc1=Vdc_ref1;
When detecting that the peak value of three-phase input voltage is less than Vdc, again using given as adjuster of Vdc_ref0, the control signal of controller changes, and makes the output voltage of booster converter finally be stabilized in Vdc, Vdc=Vdc_ref0;
When detecting that the peak value of any phase input voltage is in K1*Vdc to K2*Vdc scope, using given as adjuster of Vdc_ref2, the control signal of controller changes, and makes the output voltage of booster converter finally be stabilized in Vdc2, Vdc2=Vdc_ref2;
When detecting that the peak value of three-phase input voltage is in Vdc to K1*Vdc scope, again using given as adjuster of Vdc_ref1, the control signal of controller changes, and makes the output voltage of booster converter finally be stabilized in Vdc1, Vdc1=Vdc_ref1.
5. UPS three-phase input current-sharing control method according to claim 4, it is characterized in that, described Vdc value is 360V when UPS nominal operation.
6. UPS three-phase input current-sharing control method according to claim 4, it is characterized in that, described Vdc_ref0 value is 360V.
7. UPS three-phase input current-sharing control method according to claim 4, it is characterized in that, described Vdc_ref1 value is 375V.
8. UPS three-phase input current-sharing control method according to claim 4, it is characterized in that, described Vdc_ref2 value is 390V.
9. UPS three-phase input current-sharing control method according to claim 4, it is characterized in that, described K1 value is 1.042.
10. UPS three-phase input current-sharing control method according to claim 4, it is characterized in that, described K2 value is 1.083.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410605954.5A CN104333023B (en) | 2014-10-30 | UPS three-phase input equal current-sharing controller and the current-sharing control method of UPS |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410605954.5A CN104333023B (en) | 2014-10-30 | UPS three-phase input equal current-sharing controller and the current-sharing control method of UPS |
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| Publication Number | Publication Date |
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| CN104333023A true CN104333023A (en) | 2015-02-04 |
| CN104333023B CN104333023B (en) | 2017-01-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995057A (en) * | 2018-01-03 | 2019-07-09 | 维谛技术有限公司 | UPS current equalizing method and equipment |
| CN110677032A (en) * | 2019-10-21 | 2020-01-10 | 宁波奥克斯电气股份有限公司 | Current sharing control method and device for staggered parallel PFC circuit and air conditioner |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006271080A (en) * | 2005-03-23 | 2006-10-05 | Nec Corp | Power supply system and input current balancing control method |
| CN201408996Y (en) * | 2008-10-07 | 2010-02-17 | 厦门科华恒盛股份有限公司 | Three-phase input equal current-sharing controller with power factor correction |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006271080A (en) * | 2005-03-23 | 2006-10-05 | Nec Corp | Power supply system and input current balancing control method |
| CN201408996Y (en) * | 2008-10-07 | 2010-02-17 | 厦门科华恒盛股份有限公司 | Three-phase input equal current-sharing controller with power factor correction |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995057A (en) * | 2018-01-03 | 2019-07-09 | 维谛技术有限公司 | UPS current equalizing method and equipment |
| CN109995057B (en) * | 2018-01-03 | 2020-11-20 | 维谛技术有限公司 | UPS current equalizing method and equipment |
| CN110677032A (en) * | 2019-10-21 | 2020-01-10 | 宁波奥克斯电气股份有限公司 | Current sharing control method and device for staggered parallel PFC circuit and air conditioner |
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