CN103187789B - Quick uninterruptible power system and control method thereof - Google Patents
Quick uninterruptible power system and control method thereof Download PDFInfo
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- CN103187789B CN103187789B CN201110456463.5A CN201110456463A CN103187789B CN 103187789 B CN103187789 B CN 103187789B CN 201110456463 A CN201110456463 A CN 201110456463A CN 103187789 B CN103187789 B CN 103187789B
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Abstract
The present invention relates to a kind of uninterruptible power system and method fast, its system comprises power transfer device and back-up power apparatus, and wherein, the main power source side of power transfer device connects the main power source for load supplying, back-up source side connects back-up power apparatus, and is provided with the first switch in main power source side; And the power transfer device signal of telecommunication be used for by gathering from main power source side and back-up source side judges the operating state of main power source and back-up power apparatus, and disconnect the first switch when judging that main power source occurs abnormal; When judging that main power source recovers normal, conducting first switch when judging that main power source is identical with the supply power voltage phase place of back-up power apparatus further by the signal of telecommunication gathered.System provided by the invention and control method thereof, back-up source can be switched to fast when main power source occurs abnormal to power, and main power source recovers will just be switched back to as load supplying when it is identical with back-up source phase place normally, therefore handoff procedure is completely without impacting flickering.
Description
Technical field
The present invention relates to uninterrupted power supply technology, particularly relate to a kind of uninterruptible power system fast.
Background technology
Along with the development of enriching constantly of power electronics information technology, the requirement for electric power system is also more and more higher.UPS (Uninterruptible Power Supply, uninterrupted power supply) be the general name of uninterruptible power system, act on when ensureing grid cut-off or exception and power to the uninterrupted high-quality of load, rapidity, stability and fail safe are the basic demands of uninterruptible power system.The uninterruptible power system of current application, judges rapid not, comprehensive and clear for electrical network is abnormal, the determination methods of abnormal to various electrical network (overvoltage/undervoltage, cross under-frequency, phase shortage, serious harmonic excess etc.) can not make accurate description; Electrical source exchange and control strategy for inverter are not combined closely by it simultaneously, make handoff procedure really can not realize power supply completely uninterrupted, even there will be impact.In addition, the back-up source modular structure in existing uninterruptible power system is often very complicated, needs extra rectification charging equipment to be battery charging.
Summary of the invention
The object of this invention is to provide a kind of uninterruptible power system and control method thereof fast, to solve like product Problems existing in above-mentioned correlation technique.
In order to achieve the above object, embodiments of the invention propose a kind of uninterruptible power system fast, comprise power transfer device and back-up power apparatus, the main power source side of described power transfer device connects the main power source for load supplying, back-up source side connects described back-up power apparatus, and is provided with the first switch in described main power source side; And the described power transfer device signal of telecommunication be used for by gathering from described main power source side and back-up source side judges the operating state of described main power source and described back-up power apparatus, and disconnect described first switch when judging that described main power source occurs abnormal; When judging that described main power source recovers normal, the first switch described in conducting when judging that described main power source is identical with the supply power voltage phase place of described back-up power apparatus further by the described signal of telecommunication gathered; Described back-up power apparatus receives the on-off model from described first switch, and replace described main power source to be described load supplying when receiving the signal that described first switch disconnects, stop when receiving the signal of described first switch conduction as described load supplying.
The embodiment of the present invention also proposed a kind of control method of quick uninterrupted power supply, comprises the following steps: monitoring line voltage; Described line voltage is carried out based on Clark transformation of coordinates to generate the DQ transform component of line voltage; Described DQ transform component and predetermined threshold value are compared, and judges that whether described line voltage is abnormal according to comparative result; And if judge that described line voltage is abnormal, then the first switch of closedown main power source side, and select back-up power apparatus to replace described main power source to be described load supplying.
The quick uninterruptible power system that the embodiment of the present invention provides, back-up source can be switched to fast when main power source occurs abnormal to power, and main power source recovers will just be switched back to as load supplying when it is identical with back-up source phase place normally, therefore handoff procedure is completely without impacting flickering.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the embodiment circuit block diagram of the quick uninterruptible power system of the embodiment of the present invention;
Fig. 2 is main power source and the back-up power apparatus switching flow figure of the embodiment of the present invention;
Fig. 3 is the back-up power apparatus control flow chart of the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the embodiment of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being embodiment below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " longitudinal direction ", " transverse direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
Embodiments of the invention propose a kind of uninterruptible power system fast, as shown in Figure 1, this system comprises power transfer device 11 and back-up power apparatus 12 in one embodiment, wherein, the main power source side of power transfer device 11 connects the main power source be used for for load supplying, and back-up source side then connects back-up power apparatus 12.In one embodiment of the invention, back-up power apparatus 12 can be battery.And power transfer device is provided with the first K switch 1 in main power source side; It should be noted that above-mentioned load and main power source all do not show in FIG, in one embodiment, main power source can refer to utility grid, and in the following description, if do not specialized, main power source all refers to utility grid.Further, in the present embodiment, power transfer device 11 judges the operating state of main power source and back-up power apparatus 12 for the signal of telecommunication by gathering from main power source side and back-up source side, and disconnects the first K switch 1 when judging that main power source occurs abnormal; When judging that main power source recovers normal, then in time judging that main power source is identical with the supply power voltage phase place of back-up power apparatus 12 further by the signal of telecommunication gathered conducting first K switch 1.On the other hand, back-up power apparatus 12 receives the on-off model from the first K switch 1, and replaces main power source to be load supplying when receiving the signal that the first K switch 1 disconnects, and then stops as load supplying when receiving the signal of the first K switch 1 conducting.
Below with reference to Fig. 1, the quick uninterruptible power system of the present embodiment is described in detail further.
As shown in the figure, back-up power apparatus 12 comprises: two-way inverter 121, is connected to inverter controller 122 and the battery pack 123 of two-way inverter 121 respectively, and the battery manager 124 be all connected with inverter controller 122 and battery pack 123.On the other hand, power transfer device 11 comprises: switch controller 111, the sample acquisition circuit 112 be connected with switch controller 111, be connected with sample acquisition circuit 112 and lay respectively at main power source side, the first sampled point A1, the second sampled point A2 of back-up source side and power supply outlet side and the 3rd sampled point A3, and to be connected with switch controller 111 and to lay respectively at second switch K2 and the 3rd K switch 3 of back-up source side and power supply outlet side, in addition, switch controller 111 is also connected with the first K switch 1.In one embodiment, in first, second, and third K switch 1-K3 described here each or can be all silicon controlled module, insulated gate bipolar transistor (Insulated Gate BipolarTransistor, IGBT) module or Intelligent Power Module (Intelligent Power Module, IPM), these switching devices can both realize the response speed being less than 3ms, thus can accelerate the switch speed of power supply.
In one embodiment, above-mentioned sample acquisition circuit 112 is monitored the state of main power source and back-up power apparatus 12 by first, second and third sampled point A1-A3 and monitoring result is passed to switch controller 111; The on-off model of the first K switch 1 is passed to inverter controller 122 by order wire (as shown in phantom in FIG.).Although do not show in figure, in one embodiment, sample acquisition circuit 112 here can comprise voltage transformer, power pack and voltage zero-crossing comparator, thus is respectively used to the monitoring of voltage signal, current signal and phase signal.
In one embodiment, above-mentioned switch controller 111 makes the following judgment according to the monitoring result that sample acquisition circuit 112 transmits and the operation of correspondence: control the equal conducting of first, second and third K switch 1-K3 when judging that main power voltage is normal; Control the first K switch 1 when judging main power voltage appearance exception to disconnect; When judging that main power source recovers normal, conducting first K switch 1 during by judging that main power source is identical with the supply power voltage phase place of back-up power apparatus 12 further; And control first, second and third K switch 1-K3 when judging outlet side short circuit or output overcurrent and all disconnect.In one embodiment, in order to carry out high rate bioreactor to voltage or current information, above-mentioned switch controller 111 can the processor such as such as DSP, PLC.Preferably, DSP TMS240LF2812 can be adopted as switch controller 111, here, also can adopt with the DSP TMS240LF2812 of switch controller 111 as above-mentioned inverter controller 122.
More specifically, in one embodiment, sample acquisition circuit 112 can be transmitted the line voltage information come and be converted to Ud, Uq based on Clark coordinate transform (hereinafter referred to as DQ conversion) by above-mentioned switch controller 111, because DQ coordinate transform calculates according to three-phase voltage first-harmonic instantaneous value and phase value, DC quantity Ud, Uq through converting gained can characterize frequency and the amplitude of voltage; When in same practical power, harmonic content is too high, Ud, Uq value calculated is the cumulative of first-harmonic and each harmonic, therefore, it is possible to Ud, Uq value sign electric network state.Meanwhile, because above-mentioned switch controller 111 can adopt igh-speed wire-rod production line chip, converting through DQ two DC quantity obtained can compare with inner setting value easily, greatly accelerate for all kinds of electrical network exception detection with judge speed.
Corresponding to the operation of switch controller 111, above-mentioned inverter controller 122 receives the on-off model from the first K switch 1, and after the signal obtaining the first K switch 1 disconnection, work with the two-way inverter 121 of pressure regulation Schema control, even if two-way inverter 121 replaces main power source to power to the load by the output voltage converting battery pack 123, in one embodiment, the voltage of transformation that the output voltage that two-way inverter 121 converts battery pack 123 obtains is set to all identical with amplitude with the electric voltage frequency of main power source (such as electrical network).On the other hand, inverter controller 122 to adjust stream mode to work to control two-way inverter 121, thus to stop as load supplying after the signal obtaining the first K switch 1 conducting.
Above-mentionedly to work to adjust stream mode to control two-way inverter 121, refer under electrical network keeps normal situation, two-way inverter 121 is as current source, be equivalent to the in parallel of current source and voltage source, and then adjust two-way inverter 121 output current follow mains frequency phase place change, by voltage zero-cross judge realize phase-locked (hereinafter will describe in detail); In one embodiment, stream mode is adjusted can to adopt based on control strategies such as the adjustment of DQ commutation inductance current PI, track with zero error.Above-mentionedly to work with the two-way inverter 121 of pressure regulation Schema control, refer to that without under grid condition, two-way inverter 121 is as voltage source, and using inverter output voltage as adjustment target, frequency amplitude target all can be given as required; In one embodiment, Regulation Control can adopt based on control strategies such as DQ voltage of transformation current double closed-loop PI adjustment, Repetitive controller.
Further, in one embodiment, battery manager 124 is the states for Real-Time Monitoring battery pack 123, and battery pack 123 output voltage lower than and notice inverter controller 122 when reaching predetermined threshold value.Correspondingly, when working with the two-way inverter 121 of pressure regulation Schema control, inverter controller 122 learning that from battery manager 124 output voltage of battery pack 123 quits work lower than then controlling two-way inverter 121 during preset first threshold value, to play the effect of protection battery, and with adjust stream mode control two-way inverter 121 work time, inverter controller 122 is learning that the output voltage of battery pack 123 is lower than then controlling two-way inverter 121 time default Second Threshold (it is higher than above-mentioned first threshold) by conversion main power source (as shown in Figure 1, now can be communicated with main power source and back-up power apparatus 12 by second switch K2) output voltage charge to battery pack 123, and learn the output voltage of battery pack 123 control when reaching default Second Threshold two-way inverter 121 stop to battery pack 123 charge mode of operation, thus enter no-load running state.
As seen from the above description, with adjust stream mode control two-way inverter 121 work time, can carry out charging, discharging or no-load running according to the state of battery pack 123 and load condition; If load needs, two-way inverter 121 is also exportable idle, lacks to compensate local reactive power, to improve partial electric grid power supply quality.It should be noted that, back-up power apparatus 12 exports meritorious or reactive power under the conversion of two-way inverter 121 mode of operation, the state in conjunction with battery pack 123 is all needed to carry out, to keep the indispensable capacity of battery pack 123, and then ensure that back-up power apparatus 12 can independent support load certain hour when electrical network is abnormal.
Although not shown in figure, in one embodiment, above-mentioned quick uninterruptible power system can also comprise a display unit, and it is connected with switch controller 111, for showing relevant warning message abnormal to main power source.
Based on the quick uninterruptible power system of above embodiment, the realization flow of its control method will be described in detail below.
Sample acquisition circuit 112 is by sampled point A1-A3 real-time monitoring system state and be delivered to switch controller 111.
When switch controller 111 judges that line voltage is normal, select electrical network as main power source, control switch K1-K3 conducting; By K switch 1 Continuity signal received, inverter controller 122 judges that its AC voltage starts for two-way inverter 121 the PI tune current control adopting and convert based on inductive current DQ after normal.First line voltage is shaped to square wave by sample acquisition circuit 112, positive transition is there is each voltage cycle rising edge zero crossing (or trailing edge), the pin of catching this square-wave signal being delivered to inverter controller 122 (being assumed to be above-mentioned DSP F2812) carries out transition detection, when skip signal (as the positive transition) of setting being detected, this DSP can produce capture interrupt, can record the value of the inner counter (as T2) of DSP in capture interrupt Processing tasks, this value represents electric network voltage phase; In this example, the DSP F2812 clock cycle is 6.67us, take grid cycle as 50hz, corresponding T2 count value is 11718, given mains voltage signal starting point is T2 counter 0 moment, the value reading T2 counter when entering capture interrupt is as the cycle and reset, in each voltage cycle, read the currency (be 200 part by a voltage cycle angle decomposition) of T2 counter with 100us timed task, this value is electric network voltage phase, thus achieves phase-locked.Continue, two-way inverter 121 enters no-load running state after starting, and can carry out reactive power compensation according to load and local electric network information simultaneously.The capacity of battery pack 123 is judged by battery management 124 device, if battery pack 123 voltage is lower than default Second Threshold, then inverter controller 122 controls two-way inverter 121 and runs on charged state and charge to battery pack 123, after battery pack 123 voltage reaches default Second Threshold, two-way inverter 122 stops charging and keeping no-load running state.
When various exception (power-off, overvoltage/undervoltage, excessively under-frequency, harmonic wave severe overweight etc.) appears in grid side voltage, switch controller 111 judges that line voltage Ud, Uq value exceeds setting limit value.Concrete criterion and judgement time can set according to the actual requirements, such as, record Ud, Uq value during normal voltage, and set positive and negative 20% for abnormality judgment criterions, determination time is 1ms, provides time reference by DSP Interruption.Continue, after switch controller 111 assert that electrical network is abnormal, control the first K switch 1 immediately and disconnect; Because inverter 121 two-way in back-up power apparatus 12 is in running status always, inverter controller 122 is after the signal receiving the first K switch 1 disconnection, immediately the mode of operation of two-way inverter 121 is switched to Regulation Control, run as voltage source load-supporting.Due to, easily cell damage is caused after battery pack 123 brownout, therefore battery manager 124 also needs the state of Real-Time Monitoring battery pack 123, when battery pack 123 voltage is lower than preset first threshold value (lower than above-mentioned Second Threshold), send signal to inverter controller 122, inverter controller 122 controls two-way inverter 121 and quits work.
Recover normally at line voltage, switch controller 111 obtains both sides voltage condition by main power source side sampled point A1 and back-up source side sampled point A2.Judge both sides voltage-phase by the zero-crossing comparator in above-mentioned sample acquisition circuit 112, detailed process is as follows.Catch pin, by judging that the both sides voltage jump time (when entering capture interrupt) can judge both sides voltage phase difference for two that square wave after shaping are sent into switch controller 111 (DSP); Make that both sides voltage-phase is identical two kinds of methods: one is passive detection, due to back-up source work alone time, be in Regulation Control state, it is independent voltage source, frequency keeps relative stability, and the characteristic of electrical network makes it be the network that a frequency slightly fluctuates, phase place has relative displacement between the two, can occur the situation that electrical network is identical with back-up source side phase place within a period of time; Two is Active phasings, after drawing both sides voltage-phase difference, by order wire, phase difference value is fed back to back-up source inverter controller 122 thus active adjustment back-up source output voltage phase value, makes both sides phase place identical according to above-mentioned phase difference determination methods.
And then switch controller 111, when judging to show that this both sides voltage-phase of electrical network and back-up power apparatus 12 is identical, sends instruction and controls the first K switch 1 conducting simultaneously; After inverter controller 122 obtains the signal of the first K switch 1 conducting by order wire, by two-way inverter 121 control mode switch for adjusting current control, recover electrical network as main power source power supply state; When can make power system restoration by above-mentioned judgement, handoff procedure is completely without impacting and flickering.
In an embodiment of the present invention, two-way inverter 121 also has tune current control pattern and Regulation Control pattern.Under the tune current control pattern of two-way inverter 121, namely, under electrical network keeps normal situation, two-way inverter 121, as current source, is equivalent to the in parallel of current source and voltage source, adjust two-way inverter output current and follow the change of mains frequency phase place, realize phase-locked by voltage zero-cross judgement.How to judge to realize to be prior art, therefore not repeated them here phase-locked by voltage zero-cross.In one embodiment of the invention, concrete tune flow control policy can adopt based on control strategies such as the adjustment of DQ commutation inductance current PI, track with zero error.Under the Regulation Control pattern of two-way inverter 121, namely without under grid condition, two-way inverter is as voltage source, and using inverter output voltage as adjustment target, frequency amplitude target all can be given as required.In one embodiment of the invention, Regulation Control strategy can adopt based on control strategies such as DQ voltage of transformation current double closed-loop PI adjustment, Repetitive controller.
As shown in Figure 2, be main power source and the back-up power apparatus switching flow figure of the embodiment of the present invention, comprise the following steps:
Step S201, the voltage of Real-Time Monitoring main power source side (i.e. electrical network), and line voltage is carried out based on Clark transformation of coordinates to generate the DQ transform component of line voltage.In an embodiment of the present invention, monitor by the first sampled point A1.Particularly, when electrical network is normal using electrical network as main power source, described K switch 1, K2 conducting, described sample acquisition circuit carries out Real-Time Monitoring to line voltage.The line voltage information that the transmission of sample acquisition circuit comes by switch cubicle controller is converted to Ud, Uq based on Clark coordinate transform (hereinafter referred to as DQ conversion), because DQ coordinate transform calculates according to three-phase voltage first-harmonic instantaneous value and phase value, DC quantity Ud, Uq through converting gained can characterize frequency and the amplitude of voltage; When in same practical power, harmonic content is too high, Ud, Uq value calculated is the cumulative of first-harmonic and each harmonic, therefore can with Ud, Uq value sign electric network state.
Step S202, described DQ transform component and predetermined threshold value are compared, and judge that whether described line voltage is abnormal according to comparative result, if judge that described line voltage is abnormal, then close the first switch of main power source side, and select back-up power apparatus to replace described main power source to be described load supplying.
In an embodiment of the present invention, controller adopts igh-speed wire-rod production line chip, enters DQ and convert two DC quantity obtained and can compare with inner setting value easily, greatly accelerate for all kinds of electrical network exception detection and judge speed.The two-way inverter of back-up source works in tune stream mode, can carry out charging according to battery state and load condition, to discharge or for zero load; If load needs, also exportable idle, lack to compensate local reactive power, improve partial electric grid power supply quality.Back-up source exports meritorious or reactive power, all needs to carry out in conjunction with battery state, keeps the capacity of battery pack indispensability, can independent support load certain hour during to ensure that electrical network is abnormal.
When electrical network occurs abnormal, according to comparative result, described switch cubicle controller judges that electrical network occurs abnormal, controls main power source side K switch 1 and disconnects.Described inverter controller adjusts two-way inverter and works in pressure regulation pattern after obtaining K switch 1 cut-off signal.Because K switch 1 is the non-contact switch such as controllable silicon or IGBT, the turn-off time can, within 3ms, simultaneously because inverter two-way in back-up source is in real-time online state, therefore can make load supplying very short for break time.
Step S203, the voltage of monitoring back-up power apparatus and line voltage.
Step S204, if judge that line voltage recovers normal, then judges that whether the electric voltage frequency of described line voltage and described back-up power apparatus, amplitude be identical with phase place further.If the electric voltage frequency of described line voltage and described back-up power apparatus, amplitude are identical with phase place, then opening the first switch of described main power source side, is described load supplying by described line voltage.After power system restoration is normal, the information that described switch cubicle controller transmits according to sample acquisition circuit A1, A2, when judging that line voltage and back-up source electric voltage frequency, amplitude, phase place are identical, because back-up source output voltage is set as identical with amplitude with line voltage frequency, do not avoid producing impulse current, when detecting that both sides voltage-phase is identical, control switch K1 closes; Described inverter controller adjusts two-way inverter and works in tune stream mode after obtaining K switch 1 closure signal.
As shown in Figure 3, be the back-up power apparatus control flow chart of the embodiment of the present invention, the method comprises the following steps:
Step S301, inverter controller receives the closed information of main power source side first K switch 1, and judges that two-way inverter ac side voltage is normal.
Step S302, entering line voltage is load supplying pattern, and the two-way inverter of back-up power apparatus enters tune stream mode.
Step S303, monitors battery capacity by battery manager, is battery charging, and stops charging when battery capacity is full when battery capacity is low by line voltage.
Step S304, receives the information that main power source side first K switch 1 disconnects, and back-up power apparatus replaces main power source to be load supplying, and the two-way inverter of back-up power apparatus enters pressure regulation pattern.And back-up power apparatus quits work when battery capacity is too low.
In sum, the quick uninterruptible power system that the embodiment of the present invention provides and control method thereof have the following advantages: its system configuration is simple, and power transfer device and back-up source adopt independently controller, thus reduce system risk; The two-way inverter real-time online of power supply in support, can carry out charge or discharge according to battery pack and load condition, not need extra rectification charging equipment; Electrical network switches to back-up source fast time abnormal and powers, and handoff procedure, rapidly without impacting, switches back mains supply with back-up source frequency, amplitude, phase place time identical until electrical network after power system restoration is normal, and handoff procedure is completely without impacting flickering.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " embodiment ", " specific embodiment " or " some embodiments " etc. means to describe in conjunction with this embodiment or embodiment are contained at least one embodiment of the present invention or embodiment.In this manual, identical embodiment or embodiment are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or embodiment.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (9)
1. a quick uninterruptible power system, is characterized in that, comprises power transfer device and back-up power apparatus, wherein,
The main power source side of described power transfer device connects the main power source for load supplying, and the back-up source side of described power transfer device connects described back-up power apparatus, and is provided with the first switch in described main power source side; And the described power transfer device signal of telecommunication be used for by gathering from described main power source side and back-up source side judges the operating state of described main power source and described back-up power apparatus, and disconnect described first switch when judging that described main power source occurs abnormal; When judging that described main power source recovers normal, the first switch described in conducting when judging that described main power source is identical with the supply power voltage phase place of described back-up power apparatus further by the described signal of telecommunication gathered;
Described back-up power apparatus receives the on-off model from described first switch, and replace described main power source to be described load supplying when receiving the signal that described first switch disconnects, stop as described load supplying when receiving the signal of described first switch conduction, wherein, described back-up power apparatus comprises:
Battery pack;
Two-way inverter, described two-way inverter is connected with described battery pack, for carrying out Current adjustment when electrical network normally works according to mains frequency, and when stand-by power source device replaces described main power source to be described load supplying in the rear, Voltage Cortrol battery pack exported is to the target voltage preset;
Be connected to the inverter controller of described two-way inverter; And
The battery manager be all connected with described inverter controller and described battery pack, wherein,
When described line voltage is described load supplying, described inverter controller controls described two-way inverter and enters tune stream mode;
When described back-up power apparatus replaces described main power source to be described load supplying, described inverter controller controls described two-way inverter and enters pressure regulation pattern;
When described inverter controller controls described two-way inverter with described tune stream mode work, the state of the described battery pack of monitoring according to described battery manager and load condition carry out charging, discharge or the control of no-load running, and when described load needs, described inverter controller controls two-way inverter output reactive power.
2. uninterruptible power system fast as claimed in claim 1, it is characterized in that, described power transfer device comprises:
Switch controller;
The sample acquisition circuit be connected with described switch controller;
Be connected with described sample acquisition circuit and lay respectively at main power source side, the first sampled point of back-up source side and power supply outlet side, the second sampled point and the 3rd sampled point; And
Be connected with described switch controller and lay respectively at second switch and the 3rd switch of back-up source side and power supply outlet side; Described switch controller is also connected with described first switch;
Wherein, described sample acquisition circuit is monitored the state of described main power source and back-up power apparatus by described first, second and third sampled point and monitoring result is passed to described switch controller, and the on-off model of described first switch is passed to described inverter controller by order wire.
3. uninterruptible power system fast as claimed in claim 2, is characterized in that,
Described switch controller, for judging according to the monitoring result of described sample acquisition circuit transmission: judging that described main power voltage controls the equal conducting of described first, second and third switch time normal; Control described first switch when judging described main power voltage appearance exception to disconnect; When judging that described main power source recovers normal, the first switch described in conducting during by judging that described main power source is identical with the supply power voltage phase place of described back-up power apparatus further; And control described first, second and third switch when judging described outlet side short circuit or output overcurrent and all disconnect;
Described inverter controller, for receiving the on-off model from described first switch, and after the signal obtaining described first switch disconnection, controls the output voltage of described two-way inverter by the described battery pack of conversion to described load supplying; Described inverter controller controls described two-way inverter after the signal obtaining described first switch conduction to be stopped as described load supplying.
4. uninterruptible power system fast as claimed in claim 3, is characterized in that,
Described battery manager is used for the state of battery pack described in Real-Time Monitoring, and described battery pack output voltage lower than and notify described inverter controller when reaching predetermined threshold value;
When described two-way inverter is to described load supplying, described inverter controller is used for learning that the output voltage of described battery pack quits work lower than controlling described two-way inverter during preset first threshold value;
When described two-way inverter stops as described load supplying, described inverter controller is used for learning that the output voltage of described battery pack is lower than controlling the output voltage of described two-way inverter by conversion described main power source during default Second Threshold to described batteries charging, and learning that the output voltage of described battery pack controls described two-way inverter and stops to described batteries charging when reaching described default Second Threshold.
5. the quick uninterruptible power system as described in any one of claim 2-4, is characterized in that, also comprise:
Display unit, described display unit is connected with described switch controller, for showing relevant warning message abnormal to described main power source.
6. the quick uninterruptible power system as described in any one of claim 2-4, it is characterized in that, described sample acquisition circuit comprises voltage transformer, power pack and voltage zero-crossing comparator, is respectively used to the monitoring of voltage signal, current signal and phase signal.
7. the quick uninterruptible power system as described in any one of claim 1-4, is characterized in that, described first switch, second switch and the 3rd switch are silicon controlled module, insulated gate bipolar transistor IGBT module or intelligent power module.
8. a control method for quick uninterrupted power supply, is characterized in that, comprises the following steps:
Monitoring line voltage;
Described line voltage is carried out based on Clark transformation of coordinates to generate the DQ transform component of line voltage;
Described DQ transform component and predetermined threshold value are compared, and judges that whether described line voltage is abnormal according to comparative result; And
If judge that described line voltage is abnormal, then close the first switch of main power source side, and select back-up power apparatus to replace described main power source to be described load supplying, wherein,
When described line voltage is described load supplying, the two-way inverter of described back-up power apparatus enters tune stream mode;
When described back-up power apparatus replaces described main power source to be described load supplying, the two-way inverter of described back-up power apparatus enters pressure regulation pattern;
When described two-way inverter is with the work of described tune stream mode, carries out charging according to the state of battery pack and load condition, discharge or the control of no-load running, and when described load needs, control two-way inverter output reactive power.
9. the control method of uninterrupted power supply fast as claimed in claim 8, is characterized in that, also comprise:
Monitor the voltage of described back-up power apparatus;
If judge that described line voltage recovers normal, then judge that whether the electric voltage frequency of described line voltage and described back-up power apparatus, amplitude be identical with phase place further;
If the electric voltage frequency of described line voltage and described back-up power apparatus, amplitude are identical with phase place, then opening the first switch of described main power source side, is described load supplying by described line voltage.
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