CN202405783U - Power converter with functions of uninterrupted power supply (UPS) and active power filter - Google Patents
Power converter with functions of uninterrupted power supply (UPS) and active power filter Download PDFInfo
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- CN202405783U CN202405783U CN2011204887196U CN201120488719U CN202405783U CN 202405783 U CN202405783 U CN 202405783U CN 2011204887196 U CN2011204887196 U CN 2011204887196U CN 201120488719 U CN201120488719 U CN 201120488719U CN 202405783 U CN202405783 U CN 202405783U
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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
- Y02E40/20—Active power filtering [APF]
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Abstract
The utility model relates to a power converter with functions of an uninterrupted power supply (UPS) and an active power filter, and belongs to the technical field of power converters. The power converter comprises the active power filter, a digital control circuit and a storage battery, wherein the storage battery and the digital control circuit are electrically connected with the active power filter respectively. The power converter has the advantages that the storage battery is connected in parallel with the direct current side of a main circuit of the active power filter, so that harmonic current and reactive compensation are realized, and the storage battery accumulates energy; therefore, when a voltage power supply of a power grid fails, the storage battery can supply power to a load through a current transformer; due to control over the current transformer, the extra UPS equipment is eliminated, so that the equipment cost is reduced; and when the power supply supplies power normally, the UPS stabilizes and filters the power supply to a certain extent and sends the power to the load, so that alternating current with relatively high quality can be applied to the load.
Description
Technical field
The present invention relates to a kind of power inverter, specifically is the power inverter of a kind of UPS of having concurrently and Active Power Filter-APF function, belongs to the power inverter technical field.
Background technology
In recent years; The generally use of power electronic equipment and nonlinear load; Make harmonic current and reactive current inject electrical network in a large number, the safe operation of serious threat electrical network and electric equipment is used with normal, carries out filtering and compensate being paid attention to by People more and more to harmonic wave is idle.Active Power Filter-APF is preferably one of the selection that improves the quality of power supply, therefore develops very fast.Shunt active power filter injects offset current to electrical network, offsets the harmonic wave that harmonic source produces, and makes source current become sine wave, itself shows the characteristic of current source.Serious day by day along with the harm of public electric wire net harmonic wave, current in middle wire, four brachium pontis parallel active filters, four brachium pontis OILS STRUCTURE DEPRESSION current in middle wire effects are better, therefore become the focus of present research.
UPS claims uninterrupted power supply again, and it is generally used for utility grid and with between the electric loading, its objective is the power supply quality of improvement to load, and when municipal power failure, the normal operation of proof load equipment.Along with development of modern industry, the load of supply network becomes increasingly complex, the particularly startup of large-scale electric equipment and stopping, and the application of large-scale controlled power electronic equipment and network internal noise can make AC sine wave distort.In addition, natural thunder and lightning, factors influence such as the imperfect earth of electrical network are to the power supply quality of electrical network.Because the influence of above factor; May cause being connected on the computer equipment on the electrical network; Comprise communication, medical treatment; Serious consequences such as that accurate instrument and equipment such as finance, weapon control takes place is out of control, obliterated data, shutdown, damage directly influence user's operate as normal, cause serious economy loss.
In power distribution network, be generally the three-phase four-wire system structure; And adopt four bridge arm topological structures to can be good at suppressing current in middle wire; Therefore more and more wider with the application of the parallel connection type active electric filter of UPS function; Demand is increasing, and power is increasing and technical difficulty is big, therefore studies the high-power parallel connection type active electric filter with the UPS function of three-phase four-arm and is with a wide range of applications and general realistic meaning.
Summary of the invention
Problem to above-mentioned prior art existence; The present invention provides the power inverter of a kind of UPS of having concurrently and Active Power Filter-APF function, can carry out harmonic current and reactive power compensation and when electrical network breaks down, can provide to load stablizing continual three-phase alternating current to load.
To achieve these goals; The technical scheme that the present invention adopts is: the power inverter of a kind of UPS of having concurrently and Active Power Filter-APF function; Comprise Active Power Filter-APF and digital control circuit, also comprise storage battery, storage battery and digital control circuit are electrically connected with Active Power Filter-APF respectively;
Further, storage battery is connected in parallel on the main circuit DC side of Active Power Filter-APF;
Further, storage battery is connected in parallel on the two ends of electric capacity, and is simultaneously parallelly connected with the dc voltage transducer.
Operation principle: when the power supply normal power supply, power inverter is used as Active Power Filter-APF, and to harmonic wave in the electrical network and idle replenishing, accumulators charges simultaneously; When the electric network source phase shortage or when opening circuit, power inverter carries out the continuous power supply of certain hour to load as uninterrupted power supply.
The invention has the beneficial effects as follows: the present invention at the main circuit DC side parallel of Active Power Filter-APF storage battery; When accomplishing harmonic current and reactive power compensation; Also storage battery is carried out energy storage; Make storage battery when the line voltage power supply trouble, can supply power to load through current transformer; Through the control to current transformer, this system has just saved extra UPS equipment, has reduced equipment cost; In the power supply power supply just often, UPS itself gives load after power supply is carried out certain voltage regulation filtering again, can make the AC power that obtains better quality in the load.
This device has the filter function and the uninterrupted power supply function of common Active Power Filter-APF simultaneously, can follow the tracks of mains by harmonics and idle variation fast, realizes quick dynamic compensation; When the power supply phase shortage or when opening circuit, current transformer is used as inverter, and UPS carries out the uninterrupted power supply of certain hour through inverter to load, needs with the power supply of proof load; Because the filter and the ups power two sub-systems common hardware resources of this device, so it is simple in structure, the hardware utilance high, system cost is low.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is a storage battery over-voltage detection circuit schematic diagram of the present invention;
Fig. 3 is the UPS equivalent circuit diagram;
Fig. 4 is a storage battery undervoltage detection circuit schematic diagram;
Fig. 5 is the protective circuit schematic diagram of storage battery.
Among the figure: 1, three phase mains; 2, voltage sensor; 3, load current sensor; 4, APF side current sensor; 5, APF side voltage sensor; 6, dc voltage transducer, 7, power inverter, 8, electric capacity, 9, storage battery, 10, load, 12, testing circuit, 13, modulate circuit, 14, the DSP3DSVPWM algorithm, 15, FPGA, 16,8 road IGBT gate signal.
Embodiment
To combine accompanying drawing and embodiment that the present invention is described further below.
As shown in Figure 1, a kind of power inverter that has UPS and Active Power Filter-APF function concurrently is made up of Active Power Filter-APF, digital control circuit and storage battery 9, and storage battery 9 is electrically connected with Active Power Filter-APF respectively with digital control circuit;
Described storage battery 9 is connected in parallel on the main circuit DC side of Active Power Filter-APF;
Described storage battery 9 is connected in parallel on the two ends of electric capacity 8, and is simultaneously parallelly connected with dc voltage transducer 6.
Said Active Power Filter-APF comprises voltage sensor 2, three phase mains 1, load current sensor 3, APF side current sensor 4, APF side voltage sensor 5, power inverter 7, electric capacity 8 and load 10; The input of voltage sensor 2 is parallel on the output of three phase mains 1, and the output of voltage sensor 2 is connected with load current sensor 3, and the output of load current sensor 3 is connected with load 10; The input of APF side voltage sensor 5 is parallel on the transmission line between load 10 and the power inverter 7; APF side current sensor 4 is series on the transmission line between load 10 and the power inverter 7; Power inverter 7 two ends shunt capacitances 8, electric capacity 8 is parallelly connected with dc voltage transducer 6.
Said digital control circuit comprises detection electricity 12, modulate circuit 13, DSP3DSVPWM algorithm 14, FPGA15 and 8 road IGBT gate signal 16; The input of testing circuit 12 is electrically connected with the output of voltage sensor 2, load current sensor 3, APF side current sensor 4, APF side voltage sensor 5 and dc voltage transducer 6 respectively; The output of testing circuit 12 is electrically connected with the input of modulate circuit 13; The output of conditioning electricity 13 and DSP3DSVPWM algorithm 14 are handled back output 4 road pwm signals, and 4 road pwm signals are handled back output 8 road IGBT gate signal 16 through FPGA15.
When the power supply normal power supply, current transformer is used as Active Power Filter-APF, and accumulators carries out energy storage simultaneously.
As shown in Figure 2; Just often through current transformer storage battery 9 is charged at power supply, storage battery 9 will detect the voltage of storage battery 9 constantly in charging, and whether inspection storage battery 9 is full of; If had been full of need stop the charging; Otherwise charging can influence the life-span of battery always, even might battery be filled quick-friedly, causes the accident; Therefore need carry out storage battery 9 overvoltages detects.
As shown in Figure 3, when the power supply power supply trouble, current transformer is used as inverter, and storage battery 9 is supplied power to load through current transformer, realizes the UPS function.
As shown in Figure 4, in three-phase four-leg inverter, no matter be at balanced load, still under the asymmetric load situation, output three-phase symmetrical sine wave voltage is crucial.Common open loop is controlled under the static conditions can export reasonable voltage waveform, but under the asymmetric load condition, under especially nonlinear load, and the load dynamic change situation, open loop control is difficult to obtain good output voltage.It is very necessary adopting closed-loop control, can not only obtain good steady-state behaviour, also has good dynamic characteristic.This device working voltage ring closed-loop control is sampled to feedback voltage, regulates producing drive signal afterwards through adjuster with the error of set-point comparison.When storage battery 9 voltages were lower than certain magnitude of voltage, if let storage battery 9 continue outwards power supply, not only efficient was low for it, but also possibly damage storage battery 9.
As shown in Figure 5, the detection of storage battery 9 comprises that overvoltage detects and under-voltage detection, need protect action to storage battery 9 when detecting the irregular operating state; Overvoltage and under-voltage protective circuit are similar; Storage battery 9 voltages are just often imported P1.3=0, through software programming output pin P1.5=0 are set; Not conducting of triode, relay coil must not.And in the time of storage battery 9 overvoltages, P1.3=1, at this time, output P1.5=1, the triode conducting, it is electric that relay coil J1 gets, and charging circuit is cut off in contact switch action corresponding with it, stops storage battery 9 chargings.When battery tension recovered normal range (NR), control made P1.5=0, coil losing electricity, and the diode here plays the effect of afterflow.
Claims (3)
1. power inverter that has UPS and Active Power Filter-APF function concurrently; Comprise Active Power Filter-APF and digital control circuit; It is characterized in that also comprise storage battery (9), storage battery (9) and digital control circuit are electrically connected with Active Power Filter-APF respectively.
2. a kind of power inverter that has UPS and Active Power Filter-APF function concurrently according to claim 1 is characterized in that described storage battery (9) is connected in parallel on the main circuit DC side of Active Power Filter-APF.
3. a kind of power inverter that has UPS and Active Power Filter-APF function concurrently according to claim 2 is characterized in that described storage battery (9) is connected in parallel on the two ends of electric capacity (8), and is simultaneously parallelly connected with dc voltage transducer (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204887196U CN202405783U (en) | 2011-11-30 | 2011-11-30 | Power converter with functions of uninterrupted power supply (UPS) and active power filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204887196U CN202405783U (en) | 2011-11-30 | 2011-11-30 | Power converter with functions of uninterrupted power supply (UPS) and active power filter |
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| CN202405783U true CN202405783U (en) | 2012-08-29 |
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| CN2011204887196U Expired - Fee Related CN202405783U (en) | 2011-11-30 | 2011-11-30 | Power converter with functions of uninterrupted power supply (UPS) and active power filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412609A (en) * | 2011-11-30 | 2012-04-11 | 徐州中矿大传动与自动化有限公司 | Power inverter with functions of UPS (uninterrupted power supply) and active power filter |
| CN103595123A (en) * | 2013-11-27 | 2014-02-19 | 武汉康籁电气有限公司 | Dual-power-supply device and method applied to APF (Active Power Filter) system |
| 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 |
-
2011
- 2011-11-30 CN CN2011204887196U patent/CN202405783U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412609A (en) * | 2011-11-30 | 2012-04-11 | 徐州中矿大传动与自动化有限公司 | Power inverter with functions of UPS (uninterrupted power supply) and active power filter |
| CN103595123A (en) * | 2013-11-27 | 2014-02-19 | 武汉康籁电气有限公司 | Dual-power-supply device and method applied to APF (Active Power Filter) system |
| 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 |
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