CN106159951B - A kind of composite power source with emergency power supply and active power filtering function - Google Patents

A kind of composite power source with emergency power supply and active power filtering function Download PDF

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Publication number
CN106159951B
CN106159951B CN201610602745.4A CN201610602745A CN106159951B CN 106159951 B CN106159951 B CN 106159951B CN 201610602745 A CN201610602745 A CN 201610602745A CN 106159951 B CN106159951 B CN 106159951B
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inverter
power supply
alternating current
switch element
current
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CN106159951A (en
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郜克存
隋学礼
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Qingdao Gomatech Group Co ltd
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Qingdao Gomatech Group Co ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01Arrangements for reducing harmonics or ripples
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18Arrangements for adjusting, eliminating or compensating reactive power in networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Inverter Devices (AREA)
  • Stand-By Power Supply Arrangements (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a kind of composite power sources with emergency power supply and active power filtering function, including are used for mains electricity input end, load outputs, active filter, reactive-load compensator, current transformer, accumulator, double switching devices and Centralized Controller;The Centralized Controller controls current transformer when alternating current is normal and is operated in rectification state, and starts after the active filter and reactive-load compensator carry out harmonics restraint and reactive-load compensation to alternating current, powers for external load, and be accumulator accumulation of energy;In city, electrical anomaly time control current transformer is operated in inverter mode, by the DC inverter of accumulator output at alternating current, uninterrupted power supply is provided for external load, to while meeting load power demand, power quality is improved, and substantially increases the transfer efficiency of uninterruptible power supply, improves the utilization rate of the energy, the calorific value for reducing circuit system extends the service life of uninterruptible power supply.

Description

A kind of composite power source with emergency power supply and active power filtering function
Technical field
The invention belongs to emergency power supply technical fields, specifically, being to be related to one kind with emergency power supply and active filter The composite power source of two kinds of functions of wave device.
Background technology
With the development of the society, the development of science and technology, more and more electrical equipments are to the quality of power supply, safety and reliable Property proposes increasingly higher demands.These electrical equipments (such as fire fighting device, elevator, base station) on the one hand need to configure second Road power supply, so that when power grid powers off suddenly emergency power supply can be provided for it, using electric equipment can one section of continuous service when Between, avoid electrical equipment safety accident generation out of service that may cause because powering off suddenly;On the other hand, these electricity consumptions Equipment will produce a large amount of harmonic wave during operation, these harmonic waves are fed back to power grid, can be polluted to power grid, influence alternating current product Matter, it is therefore desirable to configure filter, filter out the higher hamonic wave in power grid, to optimize city's electricity quality.
In order to meet the above-mentioned power demand of electrical equipment, existing solution is taken respectively for two aspect problems Solution is divided and rule.For example, emergency power supply is separately configured for electrical equipment, provided for electrical equipment in grid cut-off Uninterrupted power supply;Meanwhile active filter being separately configured in power grid, the higher hamonic wave in power grid is eliminated, power supply quality is improved. That is, a problem corresponds to a solving device, resource cannot be shared, and Resolving probiems limitation is very big, causes the serious of resource Waste, and the effect is unsatisfactory for solution.
Invention content
The purpose of the present invention is to provide a kind of composite power source with emergency power supply and active power filtering function, alternating current just It can be used as active filter when often, can be used as emergency power supply in municipal power failure, electricity consumption can not only be met The use demand of the uninterrupted power supply of equipment, and power supply quality can be improved, reduce cost.
In order to solve the above technical problems, the present invention is achieved by the following scheme:
A kind of composite power source with emergency power supply and active power filtering function, including mains electricity input end, load outputs, fill Electric appliance, battery pack, inverter and monitor;The mains electricity input end is for connecting external alternating current;The load outputs are used for External load, and by the mains electricity input end described in main power transmission connection, connect in the main power transmission circuit There is first switching element;It is defeated that the electric main accessed by the mains electricity input end is converted into direct current energy by the charger Go out;The battery pack receives and stores the direct current energy of the charger output;The input side of the inverter is opened by switching Pass is connect with the main power transmission circuit and battery pack respectively, and outlet side is all the way by described in the connection of second switch element Load outputs, another way by LC filter circuits via the third switch element connection main power transmission circuit, The both ends of the third switch element are parallel with the series arm of resistance and the 4th switch element;The monitor detection passes through institute Whether the electric main for stating mains electricity input end access is normal, if alternating current is normal, controls the first switching element and the 4th and opens Element is closed to be closed, second switch element disconnects, and is closed after capacitance of the third switch element in the LC filter circuits is fully charged, And after third switch element closure, controls the 4th switch element and disconnect;The switching switch is controlled by inverter Input side be connected to main power transmission circuit, the output of control inverter with the harmonic current in alternating current is equal in magnitude, direction phase Output is to the main power transmission circuit after anti-compensation electric current is filtered via the LC filter circuits, and then utilizes and filter out harmonic wave Alternating current afterwards is powered for the external load;If city's electrical anomaly, controls the first switching element and third switch element is disconnected It opens, second switch element is closed, and is controlled the switching switch and be connected to the input side of inverter with battery pack, and inverter is controlled The direct current energy that battery pack exports is reverse into alternating current, is powered for the external load.
Further, the monitor is detecting alternating current from normally becoming abnormal, then by abnormal restoring to it is normal when, control It makes the first switching element and third switch element is closed, resistance described in direct short-circuit.
In order to improve the accuracy of city's electro-detection and shorten detection time, the monitor is defeated by the alternating current in detection Enter the electric main that terminates it is whether normal during, preferably be carried out following detection process:
To the three-phase voltage u of the electric maina、ub、ucCarry out α β transformation, by abc three-phase rotating coordinate systems transform to α, β two-phase stationary coordinate systems generate the α axis components under α β coordinate systemsAnd beta -axis componentWherein, U is the voltage vector of the electric main;
To the beta -axis component uβMatrixing is done, u is madeβ- 90 ° of phase shift obtains α axis components uα’;
To the α axis components uα' and beta -axis component uβDq transformation is carried out, the d axis components u under dq coordinate systems is generateddWith q axis point Measure uq
By the d axis components udWith q axis components uqBy low-pass filter, flip-flop u therein is obtainedd0And uq0
By the flip-flop ud0、uq0It is compared with the voltage rating of standard alternating current, if described in one of them deviation Voltage rating 15% or more then judges city's electrical anomaly;Otherwise, it is determined that alternating current is normal.
Further, the three-phase bridge being formed by connecting by six switching tubes is provided in the inverter;The monitor By changing six road modulated pulse signals of its output, to change the break-make sequential of six switching tubes, and then described in control Inverter is operated in active power filtering state or inverter mode.
Further, the electric main is the three-phase four-wire system Alternating Current Power Supply of 380V, includes in the inverter There are two capacitance, the both ends of the DC side of three-phase bridge, the intermediate node of two capacitances are connected to after described two capacitance series connection The zero curve that the three-phase four-wire system Alternating Current Power Supply is connected by first group of gating switch in the switching switch, in the monitoring When device detects that alternating current is normal, controls first group of gating switch and be closed, the operating current on the zero curve is transmitted to institute Inverter is stated, and controls three-phase bridge and generates compensation electric current equal in magnitude with the harmonic current in alternating current, direction is opposite, output is extremely The phase line of the three-phase four-wire system Alternating Current Power Supply, makes the inverter be operated in active power filtering state.
Further, in the inverter, the both ends of the DC side of three-phase bridge pass through the in the switching switch Two groups of gating switches connect the battery pack;The monitor controls second group of gating and opens when detecting city's electrical anomaly It closes and closes, the direct current energy that battery pack exports is transmitted to the inverter, and generate described in six road modulated pulse signal controls Inverter is operated in inverter mode, and inversion exports three-phase alternating-current powered.
Preferably, by the inverter inversion export three-phase alternating-current powered via transformer carry out voltage transformation and After filter capacitor filtering, by the second switch element transmission of closure to the load outputs, and then supplied for external load Electricity.
Further, it is connected with the detection device for acquiring electric current, voltage in the mains electricity input end of the composite power source, The unusual condition for the detection signal monitoring alternating current that the monitor is exported according to the detection device.
Compared with prior art, the advantages and positive effects of the present invention are:The composite power source of the present invention, which is integrated with, answers urgent telegram The two kinds of functions in source and active filter can be used as active filter when alternating current is normal, filter out higher hamonic wave in alternating current simultaneously Certain reactive-load compensation can be provided, to optimize alternating current, improve power supply quality;In city when electrical anomaly, it can be carried for power load For the second road power supply, to meet the uninterrupted power demand of certain loads.The composite power source of the present invention is by emergency power supply and active Two kinds of functions of filtering integrate, and while meeting load supplying requirement, can eliminate the harmonic wave and nothing of power grid Work(influences, and product cost is reduced while improving power quality.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more Add clear.
Description of the drawings
Fig. 1 is a kind of embodiment of the composite power source with emergency power supply and active power filtering function proposed by the invention System architecture diagram;
Fig. 2 is a kind of schematic block circuit diagram of embodiment of active frequency converter and battery pack in Fig. 1;
Fig. 3 is a kind of circuit diagram of embodiment of inverter in Fig. 2;
Fig. 4 is fundamental diagram of the active frequency converter when alternating current is normal shown in Fig. 2;
Fig. 5 is fundamental diagram of the active frequency converter shown in Fig. 2 in city's electrical anomaly;
A kind of schematic diagram of embodiment of the cities Tu6Shi electric detection method.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with the accompanying drawings.
The composite power source of the present embodiment requires to configure the second road power supply and in load running process for certain power loads In the problem of being also easy to produce harmonic wave, power grid is polluted, it is proposed that a kind of completely new power circuit topology structure a so that electricity Source device has both two kinds of functions of emergency power supply and active power filtering, is reached while improving power supply quality by shared hardware resource Having arrived reduces the purpose of design of product cost.
As shown in Figure 1, the composite power source of the present embodiment is mainly provided with mains electricity input end VIN, load outputs VOUT, has Source frequency converter INV, LC filter circuit, battery pack BAT and variable connector element KM1, KM2, MK3, KM4.Wherein, alternating current inputs VIN is held to be used for outside electric power network, incoming transport alternating current, and in the inside of composite power source, the mains electricity input end VIN can pass through Main power transmission circuit is connected to load outputs VOUT via first switching element KM1, when alternating current is normal, passes through control the One switch element KM1 is closed, and the electric main accessed by mains electricity input end VIN is transmitted to load outputs VOUT, into And it is powered to the power load external with it by load outputs VOUT.
In order to improve power supply quality, active frequency converter INV is arranged in the present embodiment in the composite power source, normal in alternating current When, it is linked into the higher hamonic wave in the electric main of composite power source using active frequency converter INV detections, and then generate and the height Subharmonic is equal in magnitude, opposite in phase compensation electric current, the main power transmission circuit is transmitted to, in the electric main Harmonic wave compensate and offset, and then achieve the purpose that filter out mains harmonics.
For the compensation electric current exported by active frequency converter INV, after being filtered via LC filter circuits, It is transmitted to the main power transmission circuit again, to improve harmonic suppression effect.In order to ensure the LC filter circuits can have Effect operation, the present embodiment adds resistance R on the basis of the LC filter circuits, as shown in Figure 1, being transported for the first time in LC filter circuits When row, by by the resistance R access system circuits, being put into operation after fully charged with the capacitance C ensured in LC filter circuits. Specifically, it may be used and inductance L and the concatenated modes of capacitance C constituted to the LC filter circuits, by the LC filtered electricals Road is connected to the main power transmission circuit by third switch element KM3, by the resistance R and the 4th switch element KM4 The both ends of the third switch element KM3 are connected in parallel on after series connection.It, can when alternating current is normal, and the composite power source starts operation To control the KM3 disconnections of third switch element first, the 4th switch element KM4 is closed, and gives capacitance C chargings.Wait for that capacitance C is fully charged Afterwards, control third switch element KM3 is closed, and the 4th switch element KM4 is disconnected, and resistance R is shorted out, to reduce system power dissipation.
In utility power failure or abnormal appearance, in order to give external loading to provide emergency power supply, the present embodiment Battery pack BAT is set in the composite power source.It is that battery pack BAT charges using electric main when alternating current is normal, storage electricity Energy;In city when electrical anomaly, the battery pack BAT electric energy stored is supplied to active frequency converter INV, it is inverse using active frequency converter INV Become the Alternating Current Power Supply needed for output power load, and then is transmitted to the load outputs by stand-by power supply transmission line VOUT continues as external load power supply by load outputs VOUT, when to reach the cities Liao electrical anomaly, is carried for power load For the purpose of design of emergency power supply.
Can connect second switch element KM2 in the stand-by power supply transmission line, as shown in Figure 1.When alternating current is normal When, control first switching element KM1 closures, the mode that second switch element KM2 is disconnected may be used, by main power transmission circuit It connects, is load supplying using electric main;And when municipal power failure or exception, control first switching element may be used The mode that KM1 is disconnected, second switch element KM2 is closed, stand-by power supply transmission line is connected, the electricity of composite power source energy storage is utilized It can be load supplying, play the role of emergency power supply.
For the Alternating Current Power Supply exported by active frequency converter INV inversions, can be further depressured by transformer T After transformation, then via the second switch element KM2 of filter capacitor CE and closure it is transmitted to load outputs VOUT, it is outer to meet Connect the power requirement of load.The exchanging between outlet side for armature winding and active frequency converter INV of the transformer T can be into One step connects the 5th switch element KM5, as shown in Figure 1.When alternating current is normal, disconnected by the 5th switch element KM5 of control, it can It is transmitted to transformer T to avoid the harmonic compensation current exported by active frequency converter INV, by ensureing harmonic compensation current Correct flow direction to ensure that composite power source is accurately operated in active power filtering state, and then reaches the design mesh for improving power grid quality 's.
In the present embodiment, the switch element KM1-KM5 can select relay, silicon-controlled etc. to have on-off action simultaneously Support high current by switch block realize, the present embodiment is to this without concrete restriction.
Fig. 2 is the circuit framework figure of the active frequency converter INV, including charger, inverter, monitor and switching switch KD.Wherein, charger connects main power transmission circuit, when alternating current is normal, receives the exchange accessed by mains electricity input end VIN Alternating current, and electric main is converted into direct current, output to battery pack BAT is battery pack BAT charging accumulation of energys.By inverter Input side is connected to switching switch KD, is correspondingly connected with respectively with main power transmission circuit and battery pack BAT by switching switch KD. When alternating current is normal, first group of gating switch KD1 in control switching switch KD is closed, and second group of gating switch KD2 is disconnected, will The input side of inverter is connected to main power transmission circuit, is inverter power supply using the electric current in main power transmission circuit. When city's electrical anomaly, first group of gating switch KD1 in control switching switch KD is disconnected, and second group of gating switch KD2 is closed, will be inverse The input side for becoming device is connected to battery pack BAT, and the direct current energy using battery pack BAT outputs is inverter power supply.Monitor root According to the unusual condition of the electric main of access, the on off operating mode of two groups of gating switches KD1, KD2 in the switching switch KD are controlled, And it controls the inverter and is operated in active filter state or inverter mode.
In the present embodiment, thyristor may be used in described two groups of gating switches KD1, KD2 or two groups of relay mutual Lock-switch realizes that the present embodiment is to this without concrete restriction.
In order to enable the inverter to be operated under active power filtering and inversion two states, the present embodiment is proposed such as figure Circuit structure shown in 3 includes by six switching tube K1-K6 three-phase bridges built and capacitance C1, C2.In the present embodiment In, six switching tube K1-K6 preferably use six IGBT power tubes with anti-parallel diodes D1-D6.By two electricity After hindering C1, C2 series connection, be connected to the both ends of the DC side of three-phase bridge, i.e. between 2 points of A, B in Fig. 3, A, B of the DC side End is correspondingly connected with by switching the positive and negative electrode of the second group of gating switch KD2 and battery pack BAT in switch KD, in inversion shape Under state, the DC bus-bar voltage that battery pack BAT is provided is received.The electric main preferably uses the three-phase four-wire system of 380V to exchange Power AC380, i.e. the zero curve PEN including three tunnel phase line a, b, c and all the way.The intermediate node of two capacitances C1, C2 are passed through into switching First group of gating switch KD1 in switch KD is connected to the zero curve PEN in three-phase four-wire system Alternating Current Power Supply AC380, alternating current just Chang Shi receives the operating current on zero curve PEN, and under the control of monitor, by three-phase bridge generation and electric main Higher hamonic wave is equal in magnitude, opposite in phase compensation electric current, and transmission is corresponded to via the intermediate node of the upper and lower bridge arm of each phase bridge To three tunnel phase line a, b, c of electric main, to filter out mains harmonics, power supply quality is improved.
With reference to Fig. 1-Fig. 3, the operation principle of the composite power source of the present embodiment is specifically addressed.
When composite power source start run when, if alternating current is normal, control first by monitor second switch element KM2 with Third switch element KM3 is disconnected, and controls first switching element KM1 and the 4th switch element KM4 closures, and resistance R is accessed LC Filter circuit gives capacitance C chargings.According to the charge and discharge time of capacitance C, suitable delay time, control third switch member are set Part KM3 timing closings are closed the third switch element KM3 after capacitance C is fully charged, are then shorted out resistance R, so that LC filter circuit normal operations.After third switch element KM3 is closed, the 4th switch element KM4 can be controlled and disconnected, LC is utilized The harmonic compensation current that filter circuit exports inverter is filtered.After third switch element KM3 closures, lead to The first group of gating switch KD1 crossed in monitor control switching switch KD is closed, and by adjusting six IGBT work(in inverter The break-make sequential of rate pipe K1-K6 is operated in active filter state to control inverter, and then generates humorous with the high order in alternating current Wave is equal in magnitude, opposite in phase compensation electric current, is transmitted to LC filter circuits by the exchange outlet side of inverter, and via LC After filter circuit processing, three tunnel phase lines of electric main are fed back to, to play the purpose for eliminating the higher hamonic wave in power supply system, As shown in Figure 4.During this period, electric main is converted into direct current by charger, is battery pack BAT charging accumulation of energys.
During composite power source is run, if detecting municipal power failure or exception occur, first by monitor It controls first switching element KM1 and third switch element KM3 is disconnected, and control second switch element KM2 and the 5th switch element KM5 is closed, and connects stand-by power supply transmission line.Then, first group of gating switch in switching switch KD is controlled by monitor KD1 is disconnected, and second group of gating switch KD2 is closed, and DC bus electricity is provided for inverter using the electric energy of battery pack BAT storages Pressure is operated in inverter mode by the break-make sequential of six IGBT power tubes K1-K6 in adjusting inverter to control inverter, And then DC bus-bar voltage is reverse into three-phase alternating voltage, via the 5th switch element KM5, transformer T, filter capacitor CE with And second switch element KM2 is transmitted to load outputs VOUT, and then emergency power supply is provided for external load, as shown in Figure 5.
If city power recovery is normal, first switching element KM1 is controlled by monitor and third switch element KM3 is closed, Second switch element KM2 and the 5th switch element KM5 are disconnected, and the first group of gating switch KD1 controlled in switching switch KD is closed It closes, second group of gating switch KD2 is disconnected, and so that inverter is reworked in active power filtering state, is utilized the exchange after harmonic compensation Alternating current is powered for external load.
In order to whether realize that accurate detection, the present embodiment are used according to the whether normal mode of network voltage extremely to alternating current Judged, in conjunction with shown in Fig. 6.Since three-phase power grid voltage is time-varying of ac, it is unfavorable for sampling and controls.Therefore need by Three-phase instantaneous voltage value is transformed to DC Variable to judge.Specifically, the present embodiment uses dq decomposition methods, will exchange city first The three-phase voltage u of electricitya、ub、ucCarry out α β transformation, that is, abc three-phase rotating coordinate systems are transformed into α, β two-phase stationary coordinate system, Then projection generates the α axis components under α β coordinate systemsAnd beta -axis componentIts In, U is the voltage vector of electric main.Dq rotating coordinate systems are rotated by α β rest frames with angular velocity omega, voltage vector U With dq rotating coordinate system synchronous rotaries, it is respectively in the projection that dq rotational coordinates is fastenedWith Therefore, by certain transformation, α β rest frames can transform to dq rotating coordinate systems.
In above-mentioned α β transform methods, uαComponent is to pass through uβThe advanced 90 ° of acquisitions of component, although this method principle it is simple, It is easy to implement, but due to uαComponent and uβThe data of component do not have simultaneity, therefore error can be brought to testing result, and And the asynchronism of data often results in detection waveform and short time disturbance occurs.
In order to solve problem above, the present embodiment uses matrixing, matrixing refer to fundamental wave and each harmonic all - 90 ° of phase shifts are carried out, and keep its amplitude constant, principle is as follows:
Matrixing is carried out for continuous time signal a (t)It is defined as:
In formula, HT (a (t)) indicates to carry out matrixing to a (t);T indicates the time;* it is convolution symbol;τ is that integral becomes Amount.After signal a (t) is by matrixing, -90 ° of positive frequency component phase shift ,+90 ° of negative frequency component phase shift can be with by above formula Find out that the converter is the all-pass filter that amplitude versus frequency characte is 1.
According to formula (1) and uα、uβBetween correlation can find, uβThe phase voltage can be also obtained by matrixing In the component u of α axisα=HT (uβ).Dq decomposition methods are recycled to calculate the amplitude and phase angle of voltage dip.
It enablesTo uβDoing matrixing makes -90 ° of its phase shift, you can obtains lagging behind current β axis point The α axis components of 90 ° of amountThen by uα' and uβComponent is converted according to dq, is transformed under dq coordinate systems D axis components udWith q axis components uq, then by udAnd uqBy low-pass filter obtain the direct current in d axis components and q axis components at Divide ud0And uq0
By the flip-flop u in the d axis components and q axis componentsd0、uq0With the voltage rating of normal communication alternating current into Row compares, if one of them and voltage rating deviation 15% or 15% or more, judge municipal power failure (exception), compound electric Source is operated in emergency power supply state;Conversely, judgement alternating current is normal, composite power source is operated in active power filtering state.
Delay u is needed not move through using above city's electric detection methodαAnd uβData can obtain simultaneously, therefore shorten Detection time;And due to uα' and uβData there is simultaneity, therefore avoid the short time disturbance that detection waveform is likely to occur Phenomenon has faster response time, and accuracy of detection higher.
The mode that corresponding software program is write in monitor may be used in above-mentioned city's electric detection method, realizes monitor To the accurate detection whether electric main is abnormal.
In the present embodiment, in the input side and outlet side of composite power source detection device can be respectively set, such as Detect alternating voltage and alternating current detection instrument, respectively with the mains electricity input end VIN and load outputs of composite power source VOUT corresponds to connection, by acquiring the voltage and current of electric main, is exported to monitor with generating detection signal, is then passed through Monitor judges whether the electric main of access is normal.In city when electrical anomaly, acquired via load outputs by detection device The voltage and current of the Alternating Current Power Supply of VOUT outputs, to generate detection signal transmission to monitor, so as to pass through monitor The reversals of inverter are accurately controlled, then so that keeping steady by the Alternating Current Power Supply that load outputs VOUT is exported It is fixed.
Emergency power supply and active filter are combined into a device by the present embodiment, it is made to possess emergency power supply and active filter The function of wave device works in active power filtering state when alternating current is normal, and emergency power supply state, and energy are worked in municipal power failure The seamless switching for realizing two kinds of working conditions reduces product cost while ensureing to load normal power supply.
Certainly, the above is only a kind of preferred embodiment of the present invention, it is noted that for the general of the art For logical technical staff, various improvements and modifications may be made without departing from the principle of the present invention, these improve and Retouching also should be regarded as protection scope of the present invention.

Claims (7)

1. a kind of composite power source with emergency power supply and active power filtering function, which is characterized in that including:
Mains electricity input end, for connecting external alternating current;
Load outputs are used for external load, and by the mains electricity input end described in main power transmission connection, in the master First switching element is in series in power supply transmission line;
The electric main accessed by the mains electricity input end is converted into direct current energy output by charger;
Battery pack receives and stores the direct current energy of the charger output;
Inverter, input side are connect with the main power transmission circuit and battery pack respectively by switching switch, are exported All the way by the second switch element connection load outputs, another way switchs member by LC filter circuits via third for side The part connection main power transmission circuit is parallel with resistance and the 4th switch element at the both ends of the third switch element Series arm;
Monitor, whether detection is normal by the electric main that the mains electricity input end is accessed, if alternating current is normal, controls institute It states first switching element and the 4th switch element is closed, second switch element disconnects, and third switch element is in the LC filtered electricals The fully charged rear closure of capacitance in road, and after third switch element closure, control the 4th switch element and disconnect;Control Switching switch is made be connected to the input side of inverter with main power transmission circuit, control inverter export with it is humorous in alternating current The compensation electric current that wave size of current is equal, direction is opposite exports after being filtered via the LC filter circuits to the main power transmission Circuit, and then it is that the external load is powered to utilize the alternating current after filtering out harmonic wave;If city's electrical anomaly controls the first switch Element and third switch element disconnect, and second switch element is closed, and control the switching switch by the input side of inverter and Battery pack is connected to, and the direct current energy that battery pack exports is reverse into alternating current by control inverter, is powered for the external load;
Wherein, the monitor the electric main that detection is accessed by the mains electricity input end whether normally during, hold The following detection process of row:
To the three-phase voltage u of the electric maina、ub、ucα β transformation is carried out, abc three-phase rotating coordinate systems are transformed into α, β two Phase rest frame generates the α axis components under α β coordinate systemsAnd beta -axis component;Wherein, U is the voltage vector of the electric main;
To the beta -axis component uβMatrixing is done, u is madeβThe principle of -90 ° of phase shift, the matrixing is:Continuous time is believed Number a (t) carries out matrixingIt is defined as:
In formula, HT (a (t)) indicates to carry out matrixing to a (t);T indicates the time;* it is convolution symbol;τ is integration variable;From And obtain lagging behind the α axis components of 90 ° of current beta -axis component
To the α axis components uα' and beta -axis component uβDq transformation is carried out, the d axis components u under dq coordinate systems is generateddWith q axis components uq
D axis components u is obtained by low-pass filterdWith q axis components uqIn flip-flop ud0And uq0
By the ud0、uq0It is compared with the voltage rating of standard alternating current, if voltage rating described in one of them deviation 15% or more, then judge city's electrical anomaly;Otherwise, it is determined that alternating current is normal.
2. the composite power source according to claim 1 with emergency power supply and active power filtering function, which is characterized in that described Monitor is detecting alternating current from normally becoming abnormal, then by abnormal restoring to it is normal when, control the first switching element with Third switch element is closed, resistance described in direct short-circuit.
3. the composite power source according to claim 1 or 2 with emergency power supply and active power filtering function, which is characterized in that The three-phase bridge being formed by connecting by six switching tubes is provided in the inverter;The monitor is by changing the six of its output Road modulated pulse signal to change the break-make sequential of six switching tubes, and then controls the inverter and is operated in active filter Wavy state or inverter mode.
4. the composite power source according to claim 3 with emergency power supply and active power filtering function, which is characterized in that described Electric main is the three-phase four-wire system Alternating Current Power Supply of 380V, comprising there are two capacitance, described two electricity in the inverter Hold the both ends for the DC side that three-phase bridge is connected to after connecting, the intermediate node of two capacitances passes through first in the switching switch Group gating switch connects the zero curve of the three-phase four-wire system Alternating Current Power Supply, when the monitor detects that alternating current is normal, control First group of gating switch is closed, and the operating current on the zero curve is transmitted to the inverter, and controls three-phase bridge life At the opposite compensation electric current in, direction equal in magnitude with the harmonic current in alternating current, output to the three-phase four-wire system Alternating Current Power Supply Phase line, so that the inverter is operated in active power filtering state.
5. the composite power source according to claim 4 with emergency power supply and active power filtering function, which is characterized in that in institute It states in inverter, the both ends of the DC side of three-phase bridge connect the battery by second group of gating switch in the switching switch Group;The monitor controls second group of gating switch and is closed when detecting city's electrical anomaly, the direct current that battery pack is exported Electric energy is transmitted to the inverter, and generates the six road modulated pulse signals control inverters and be operated in inverter mode, inversion Export three-phase alternating-current powered.
6. the composite power source according to claim 5 with emergency power supply and active power filtering function, which is characterized in that pass through After the three-phase alternating-current powered of the inverter inversion output carries out voltage transformation and filter capacitor filtering via transformer, pass through The second switch element transmission of closure is powered to the load outputs, and then for external load.
7. the composite power source according to claim 1 or 2 with emergency power supply and active power filtering function, which is characterized in that It is connected with the detection device for acquiring electric current, voltage in the mains electricity input end of the composite power source, the monitor is according to institute State the unusual condition of the detection signal monitoring alternating current of detection device output.
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