CN101630854A - Uninterrupted power supply and method for detecting bypass fault of uninterrupted power supply - Google Patents
Uninterrupted power supply and method for detecting bypass fault of uninterrupted power supply Download PDFInfo
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Abstract
The invention discloses an uninterrupted power supply capable of carrying out bypass current backward flowing detection. The uninterrupted power supply comprises a UPS main circuit and a tri-line UPS bypass coupled to the UPS main circuit; and the midpoint of a bus of the UPS main circuit is connected with each one of three lines of an input end of the UPS bypass through dummy load respectively. In the uninterrupted power supply for carrying out short-circuit detection before electrification of a bypass thyristor, the midpoint of the bus of the UPS main circuit is connected with each one of the three lines of an output end of the UPS bypass through the dummy load. In the uninterrupted power supply capable of carrying out bypass current backward flowing detection and short-circuit detection before electrification of the bypass thyristor, the midpoint of the bus of the UPS main circuit is connected with each one of the three lines of the output end and each one of the three lines of the input end of the UPS bypass through the dummy load. The invention also discloses a method for detecting bypass fault of the uninterrupted power supply. The method realizes bypass detection through current detection, does not cause detection coupling as the UPS is connected with a common bypass source, and has no misinformation and omissive report in parallel operation.
Description
Technical field
The present invention relates to uninterrupted power supply (Uninterruptible Power Supply, be called for short UPS), be specifically related to a kind of carry out bypass counter irritate detections, bypass thyristor power on preceding short-circuit detecting and the two all can uninterrupted power supply and method for detecting bypass fault thereof.
Background technology
Along with the progress of power electronic technology and the develop rapidly of IT industry in recent years; people recognize the important function of UPS aspect protected data day by day, and UPS has also obtained application more and more widely in fields such as industry, communication, aerospace, military project and family lives.Particularly over the past two years, more and more enterprises was had higher requirement to self stability of network and safety of data, and global enterprise has had a bigger raising for the demand of UPS, and this plays spread effect to the improvement of power quality undoubtedly.
Bypass is counter irritates the important assurance that defencive function is the UPS trouble free service, and especially for north America region, it is the test event that safety requires, and purpose is the safety that guarantees attendant when bypass does not have input.The anti-realization action of irritating protection of bypass mainly is to occur can disconnecting bypass air switch/contactor rapidly when bypass is counter irritates, thereby guarantees effectively to avoid energy to feed back to output with any approach.
For traditional three-phase ups system, bypass is counter irritates protection and normally adopts the mode of voltage detecting to realize.A kind of is directly to judge by bypass voltage, and another kind is again that comprehensive bypass mid point is judged the voltage of bus mid point.Thisly judge whether to take place the anti-mode of irritating of bypass by voltage detecting and under some operating mode, exists and report by mistake and fail to report possibility, thereby bring misleading, and strengthened the insecurity of system to the user.In the parallel operation system, this voltage detecting scheme can be to connect together owing to the bypass source of parallel operation system all generally, and causes fault to enlarge; And the three-phase three-wire system system of failing to report that mainly occurs in, because the bus mid-point voltage may indefinite causing.Such as, just may report by mistake, fail to report in following two kinds of operating modes: battery inversion power supply under 1, the parallel operation system, there is a UPS that the anti-fault of irritating of bypass takes place, because the bypass of all machines is to connect together, cause normal machine also to detect anti-filling voltage, thereby all quote " the anti-fault of irritating of bypass " and disconnect the bypass sky and open, make normal machine also lose the bypass power supply ability, make troubles to the user; 2, battery inversion power supply under the parallel operation system has a UPS that bypass thyristor short trouble takes place, but owing to be in all not power supply state, and other normal machine all can be owing to detecting anti-filling voltage, quotes " the anti-fault of irritating of bypass " and disconnects the bypass sky and open; On the contrary, the fault machine but may can't detect this fault owing to mid-point voltage is in suspended state.
Fig. 1 is a three-phase three-wire system ups system block diagram, and voltage Vbackfeed wherein detects the bypass mid point exactly to the bus mid-point voltage.In case detect Vbackfeed greater than certain set point, states such as more comprehensive again air switches, thyristor just can decision-making system have taken place that bypass is counter irritates, thereby protect action.For three-phase four-wire system and single phase system, wrong report also is sure existence under the parallel operation system, and to fail to report situation quite a lot of relatively.
Summary of the invention
Main purpose of the present invention solves the problems of the prior art exactly, and a kind of anti-uninterrupted power supply and detection method of irritating detection of bypass of carrying out is provided, and can carry out exactly that bypass is counter irritates detection, wrong report can not occur and fails to report.
Another object of the present invention provides a kind of uninterrupted power supply and detection method that the bypass thyristor detects of carrying out, and whether the bypass thyristor that can accurately detect uninterrupted power supply before powering on is short-circuited.
A further object of the present invention provides and a kind ofly can provide uninterrupted power supply and the detection method with above-mentioned two kinds of functions.
For achieving the above object, the present invention is by the following technical solutions:
A kind of anti-uninterrupted power supply of irritating detection of bypass that carries out, comprise UPS main circuit and the three-way UPS bypass that is coupling on the described UPS main circuit, it is characterized in that the bus mid point of described UPS main circuit links to each other by each bar in dummy load and described UPS bypass input three-way respectively.
Preferably, described dummy load is resistive or inductive or capacitive character dummy load.
The anti-detection method of irritating of a kind of bypass of uninterrupted power supply is characterized in that, may further comprise the steps:
A1, the bus mid point of UPS main circuit is connected to each bar in UPS bypass input three-way by dummy load respectively;
The total current that flows through described dummy load is detected in B1, the back that powers on;
C1, judge that whether detected value surpasses setting threshold,, judge and take place that bypass is counter irritates if surpass.
A kind of carry out the bypass thyristor power on before the uninterrupted power supply of short-circuit detecting, comprise UPS main circuit and the three-way UPS bypass that is coupling on the described UPS main circuit, it is characterized in that the bus mid point of described UPS main circuit links to each other by each bar in dummy load and described UPS bypass output three-way respectively.
Preferably, described dummy load is resistive or inductive or capacitive character dummy load.
A kind of bypass thyristor detection method of uninterrupted power supply, be used for detecting power on before the whether short circuit of bypass thyristor, it is characterized in that, may further comprise the steps:
A1, the bus mid point of UPS main circuit is connected to each bar in UPS bypass output three-way by dummy load respectively;
The total current of described dummy load is flow through in B1, the preceding detection that powers on;
C1, judge that whether detected value surpasses setting threshold, if surpass, judges the short circuit of bypass thyristor.
A kind ofly carry out anti-filling of bypass and detect and the power on uninterrupted power supply of preceding short-circuit detecting of bypass thyristor, comprise UPS main circuit and the three-way UPS bypass that is coupling on the described UPS main circuit, it is characterized in that, the bus mid point of described UPS main circuit links to each other by each bar in dummy load and described UPS bypass input three-way respectively, and links to each other by each bar in dummy load and described UPS bypass output three-way respectively.
Preferably, described dummy load is resistive or inductive or capacitive character dummy load.
A kind of method for detecting bypass fault of uninterrupted power supply is characterized in that, may further comprise the steps:
A1, the bus mid point of UPS main circuit is connected to each bar in each bar in UPS bypass input three-way and UPS bypass output three-way by dummy load respectively;
The total current of the dummy load that is connected on UPS bypass output is flow through in B1, the preceding detection that powers on;
C1, judge that whether detected value surpasses setting threshold, if surpass, judges the short circuit of bypass thyristor;
The total current that flows through the dummy load that is connected on UPS bypass input is detected in D1, the back that powers on;
E1, judge that whether detected value surpasses setting threshold,, judge and take place that bypass is counter irritates if surpass.
Beneficial technical effects of the present invention is:
In first kind of uninterrupted power supply of the present invention, the bus mid point of UPS main circuit links to each other by each bar in dummy load and UPS bypass input three-way respectively, after powering on, the total current of the dummy load in the UPS bypass is flow through in detection, judge whether the total current value flow through dummy load surpasses the threshold value that sets, and then can judge whether to have taken place that bypass is counter irritates; In the another kind of uninterrupted power supply of the present invention, the bus mid point of UPS main circuit links to each other by each bar in dummy load and UPS bypass output three-way respectively, before powering on, the total current of the dummy load in the UPS bypass is flow through in detection, judge that whether the total current value that flows through dummy load surpasses the threshold value that sets, and then can judge whether the bypass thyristor short circuit has taken place;
In another uninterrupted power supply of the present invention, the bus mid point of UPS main circuit links to each other by each bar in dummy load and UPS bypass input three-way respectively, and link to each other by each bar in dummy load and UPS bypass output three-way respectively, before powering on, the total current of the dummy load that is connected on UPS bypass output is flow through in detection, judge whether the total current value that flows through dummy load surpasses the threshold value that sets, and then can judge whether the bypass thyristor short circuit has taken place, after powering on, the total current of the dummy load that is connected on UPS bypass input is flow through in detection, judge whether the total current value flow through dummy load surpasses the threshold value that sets, and then can judge whether to have taken place that bypass is counter irritates.
The mode that is different from the voltage detecting of prior art employing, the present invention realizes that by the detection to electric current the bypass of UPS detects, therefore, can not cause detecting coupling owing to UPS is connected to common bypass source, thus the defective that under the parallel operation system, can not have wrong report and fail to report.Compare with voltage detecting, the present invention has higher reliability, thereby can improve the performance and the competitiveness of product.
Description of drawings
Fig. 1 is the UPS circuit theory diagrams;
Fig. 2 can carry out the anti-circuit theory diagrams of irritating the UPS embodiment of detection of bypass for the present invention;
Fig. 3 is the circuit theory diagrams of the absorption circuit of bypass thyristor and parallel connection thereof;
Fig. 4 is the functional block diagram of the current detection circuit that adopts among a kind of embodiment;
Fig. 5 for the present invention can carry out the bypass thyristor power on before the circuit theory diagrams of UPS embodiment of short-circuit detecting;
Fig. 6 for the present invention can carry out bypass counter irritate detect and the bypass thyristor power on before the circuit theory diagrams of UPS embodiment of short-circuit detecting;
Fig. 7 is the anti-flow chart of irritating detection method embodiment of UPS bypass of the present invention;
Fig. 8 is the flow chart of UPS bypass thyristor detection method embodiment of the present invention;
Fig. 9 is the flow chart of UPS method for detecting bypass fault embodiment of the present invention.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
Embodiment
Please refer to Fig. 2, a kind of anti-uninterrupted power supply of irritating detection of bypass that carries out comprises UPS main circuit and UPS bypass, and UPS bypass and UPS main circuit are coupled, and all is connected to a thyristor on three-way between the input/output terminal of bypass.Irritate for judging whether that by detection the UPS bypass is counter bypass three-phase common mode current, (dummy load among the present invention refers in circuit in order to receive the components and parts of electrical power to have set up three capacitive dummy loads, it is unofficial load, distinguish mutually with the terminate load of circuit output end mouth), be first capacitor C 1, second capacitor C 2 and the 3rd capacitor C 3 among Fig. 2, the bus mid point N of UPS main circuit links to each other by one in first capacitor C 1, second capacitor C 2 and the 3rd capacitor C 3 and UPS bypass input three-way respectively.
Carry out that bypass is counter irritates when detecting, on UPS bypass output three-way, current detection circuit is set.Current detection circuit comprises bypass instrument transformer CT and detector (not shown), bypass instrument transformer and bypass output three-way is coupled and induces electric current, the output of bypass instrument transformer connects the input of detector, and detector is judged size of current according to the output signal of bypass instrument transformer.
In the parallel operation ups system that adopts present embodiment, when UPS works on power, the fault if one of them bypass thyristor is short-circuited, the thyristor of that phase of short circuit just has little electric current and flows through.The absorption circuit of bypass thyristor parallel connection as shown in Figure 3, particularly, each capacitive dummy load C1～C3 can be taken as 0.47 μ F, when the bypass thyristor is not short-circuited fault, owing to be connected in parallel on the capacitance very little (for example being 0.022 μ F) of the buffer capacitor C0 at bypass thyristor two ends, its resistance value is very big, so before the short circuit almost there is not power frequency component.When bypass thyristor normal turn-off, the total current that flows through on capacitive dummy load C1～C3 is:
I≈ωCU＝60*6.28*277*0.022/100000＝2.3(mA)
And when the bypass thyristor was short-circuited fault, the total current that flows through on capacitive dummy load C1～C3 was:
I＝ωCU＝60*6.28*277*0.47/1000000＝50(mA)
Therefore under these two kinds of operating modes, there is notable difference in the two current value, can judge whether to have taken place that bypass is counter irritates by detecting this electric current.Because each machine all can detect the electric current that flows to capacitive dummy load C1～C3, therefore can not cause detecting coupling between each machine owing to being connected to common bypass source, when system's parallel operation operation,, counter other machine of irritating of bypass can not report by mistake in case appearring in a certain machine yet.
Fig. 4 has showed the composition of the detector of the current detection circuit that is used for present embodiment, comprises the current sampling circuit, first order operational amplifier, block isolating circuit, absolute value circuit, filter circuit and the comparison circuit that connect successively.
Basic principle is: work on power, when the short circuit of bypass thyristor takes place when, after inducing the sampling of electric current among the bypass instrument transformer CT, import high-precision first order operational amplifier, after detecting, operational amplifier becomes voltage signal, the voltage signal of output is handled through block isolating circuit, the null offset that the filtering operational amplifier brings, carry out halfwave rectifier through absolute value circuit and filter circuit again, AC signal is become direct current, compare by comparison circuit and DC reference voltage signal Vref then, obtain one at last and have only the output signal of high-low level to send into control board.Software is analyzed according to this hardware detection signal, judges whether current value exceeds setting threshold, if exceed, just can implement protection to the anti-fault of irritating of bypass.
For example, when the parameter of thyristor circuit was got aforementioned numerical value, the current detecting threshold value that can set capacitive dummy load C1～C3 was 40mA, and when detecting electric current greater than 40mA, the comparator upset among Fig. 4 is judged the short circuit of bypass thyristor is taken place.
As shown in Figure 5, in another aspect of this invention, also provide a kind of uninterrupted power supply that the bypass thyristor detects that carries out.Be that with the aforementioned anti-difference of irritating the uninterrupted power supply of detection of bypass of carrying out in this uninterrupted power supply, the bus mid point of UPS main circuit links to each other by each bar in capacitive dummy load C4～C6 and UPS bypass output three-way respectively.
The concrete principle of current detecting is similar to preceding a kind of uninterrupted power supply, difference only is, the detection of this moment, be before the parallel operation system powers on, the total current that flows through capacitive dummy load C4～C6 to be detected, whether there has been short trouble thereby judge UPS bypass thyristor, so that the thyristor short trouble that will exist is in advance got rid of.
As shown in Figure 6, in still another aspect of the invention, also provide a kind of and carry out anti-filling of bypass and detect and the power on uninterrupted power supply of preceding short-circuit detecting of bypass thyristor.Be with the anti-difference of irritating the uninterrupted power supply of detection of aforementioned band bypass, in this uninterrupted power supply, the bus mid point of UPS main circuit not only links to each other by each bar in capacitive dummy load C1～C3 and UPS bypass input three-way respectively, and each bar that also passes through respectively in capacitive dummy load C4～C6 and UPS bypass output three-way links to each other.When implementing to detect; can before powering on, the parallel operation system detect earlier the total current that flows through capacitive dummy load C4～C6; thereby judge whether UPS bypass thyristor has existed short trouble; and after the parallel operation system powers on; then can the total current that flow through capacitive dummy load C1～C3 be detected; thereby judge whether UPS takes place that bypass is counter irritates, and can implement in view of the above that bypass is counter irritates protection.Owing to combine two kinds of detections, the fault-detecting ability of this uninterrupted power supply is stronger, the protection better effects if.
As shown in Figure 7, the anti-detection method of irritating of a kind of bypass of uninterrupted power supply, specifically can adopt following steps:
S11, the bus mid point of UPS main circuit is connected to each bar in UPS bypass input three-way by a capacitive dummy load respectively;
The total current that flows through each capacitive dummy load is detected in S12, the back that powers on;
S13, judge that whether detected value surpasses setting threshold,, judge and take place that bypass is counter irritates if surpass.
As shown in Figure 8, a kind of bypass thyristor of uninterrupted power supply preceding method for detecting short circuit that powers on, specifically can adopt following steps:
S21, the bus mid point of UPS main circuit is connected to each bar in UPS bypass output three-way by a capacitive dummy load respectively;
The total current of capacitive dummy load is flow through in S22, the preceding detection that powers on;
S23, judge that whether detected value surpasses setting threshold,, judge the short circuit of bypass thyristor takes place if surpass.
As shown in Figure 9, a kind of method for detecting bypass fault of uninterrupted power supply, specifically can adopt following steps:
S31, the bus mid point of UPS main circuit is connected to each bar in each bar in UPS bypass input three-way and UPS bypass output three-way by dummy load respectively;
The total current of the dummy load that is connected on UPS bypass output is flow through in S32, the preceding detection that powers on;
S33, judge that whether detected value surpasses setting threshold, if surpass, judges the short circuit of bypass thyristor;
The total current that flows through the dummy load that is connected on UPS bypass input is detected in S34, the back that powers on;
S35, judge that whether detected value surpasses setting threshold,, judge and take place that bypass is counter irritates if surpass.
Implementation process can repeat no more referring to the explanation of aforementioned uninterrupted power supply embodiment herein more specifically.
Employed dummy load among the present invention both can be the capacitive character dummy load, also can be resistive or inductive dummy load, or the dummy load of three types of combination in any.
The present invention utilizes the current characteristic when the UPS bypass is counter irritates, and detects that bypass is counter irritates, the current characteristic when utilizing bypass thyristor short circuit before powering on, detect power on before bypass thyristor short trouble.By between bus mid point and bypass, increasing dummy load, detect through the electric current in the capacitive dummy load and realize this two kinds of error protections.Compare with the voltage detecting scheme, the present invention has higher reliability, thereby can improve the performance and the competitiveness of product.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. one kind can be carried out the anti-uninterrupted power supply of irritating detection of bypass, comprise UPS main circuit and the three-way UPS bypass that is coupling on the described UPS main circuit, it is characterized in that the bus mid point of described UPS main circuit links to each other by each bar in dummy load and described UPS bypass input three-way respectively.
2. uninterrupted power supply as claimed in claim 1 is characterized in that, described dummy load is resistive or inductive or capacitive character dummy load.
3. the anti-detection method of irritating of the bypass of a uninterrupted power supply is characterized in that, may further comprise the steps:
A1, the bus mid point of UPS main circuit is connected to each bar in UPS bypass input three-way by dummy load respectively;
The total current that flows through described dummy load is detected in B1, the back that powers on;
C1, judge that whether detected value surpasses setting threshold,, judge and take place that bypass is counter irritates if surpass.
One kind can carry out the bypass thyristor power on before the uninterrupted power supply of short-circuit detecting, comprise UPS main circuit and the three-way UPS bypass that is coupling on the described UPS main circuit, it is characterized in that the bus mid point of described UPS main circuit links to each other by each bar in dummy load and described UPS bypass output three-way respectively.
5. uninterrupted power supply as claimed in claim 4 is characterized in that, described dummy load is resistive or inductive or capacitive character dummy load.
6. the bypass thyristor detection method of a uninterrupted power supply, be used for detecting power on before the whether short circuit of bypass thyristor, it is characterized in that, may further comprise the steps:
A1, the bus mid point of UPS main circuit is connected to each bar in UPS bypass output three-way by dummy load respectively;
The total current of described dummy load is flow through in B1, the preceding detection that powers on;
C1, judge that whether detected value surpasses setting threshold, if surpass, judges the short circuit of bypass thyristor.
7. one kind can be carried out anti-filling of bypass and detects and the power on uninterrupted power supply of preceding short-circuit detecting of bypass thyristor, comprise UPS main circuit and the three-way UPS bypass that is coupling on the described UPS main circuit, it is characterized in that, the bus mid point of described UPS main circuit links to each other by each bar in dummy load and described UPS bypass input three-way respectively, and links to each other by each bar in dummy load and described UPS bypass output three-way respectively.
8. uninterrupted power supply as claimed in claim 7 is characterized in that, described dummy load is resistive or inductive or capacitive character dummy load.
9. the method for detecting bypass fault of a uninterrupted power supply is characterized in that, may further comprise the steps:
A1, the bus mid point of UPS main circuit is connected to each bar in each bar in UPS bypass input three-way and UPS bypass output three-way by dummy load respectively;
The total current of the dummy load that is connected on UPS bypass output is flow through in B1, the preceding detection that powers on;
C1, judge that whether detected value surpasses setting threshold, if surpass, judges the short circuit of bypass thyristor;
The total current that flows through the dummy load that is connected on UPS bypass input is detected in D1, the back that powers on;
E1, judge that whether detected value surpasses setting threshold,, judge and take place that bypass is counter irritates if surpass.
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