CN105743165A - Control strategy of high-power rapid charging pile - Google Patents
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Abstract
A control strategy of a high-power rapid charging pile comprises the following steps of (a) applying a power factor correction (PFC) power supply, applying a three-phase four-wire system by an AC input part to form a three-level input, and applying a half-bridge or full-bridge LLC by a DC output part to form a high-voltage DC output; (b) acquiring power signal change of a high-voltage DC output end; (c) selecting to close a switching device corresponding to a phase input circuit when an output load is smaller than first set load-power data; and (d) selecting to close a switching device corresponding to another phase input circuit when the output load is smaller than second set load-power data. By the control strategy, the overall working efficiency of the charging pile is improved, energy source is saved, the control logic of the charging pile device is changed, namely, software small-signal control is achieved, extra hardware investment is low, and the cost is low.
Description
Technical field
The present invention relates to a kind of signal switching method, particularly relate to the changing method of a kind of power signal.
Background technology
In the prior art, such as Application No. 201210303518.3, filing date 2012.08.23, in the patent documentation of entitled " photovoltaic charge station ", including: photovoltaic module array, it is used for converting the solar into electric energy；Conflux lightning protection box, is connected to described photovoltaic module array, for converging the electric current from described photovoltaic module array in addition lightning protection；Combining inverter, be connected to described in conflux lightning protection box, change for electric current；Energy-storage battery, is used for storing electric energy；Energy manager, is connected to described combining inverter, described energy-storage battery, and for connecting with utility grid, is transmitted according to different directions by electric energy with the different conditions according to electric energy；By electric loading, it is connected to described combining inverter.
According to a kind of preferred implementation of above-mentioned photovoltaic charge station, wherein, when electric energy is transmitted according to different directions by described energy manager according to the different conditions of electric energy, if illumination barPart is good, the electric energy that described photovoltaic module array produces is directly described electricity consumption load supplying after described combining inverter inversion or is the charging of described energy-storage battery through described energy manager, and during electric energy residue, electric energy is inputted utility grid by described energy manager；If the electric energy that described photovoltaic module array produces cannot meet the needs of described electric loading, utilize described energy-storage battery for described electricity consumption load supplying after described energy manager inversion, or using utility grid is described electricity consumption load supplying through described energy manager, or use utility grid is the charging of described energy-storage battery after described energy manager inversion.
According to a kind of preferred implementation of above-mentioned photovoltaic charge station, wherein, described electric loading includes: quick charge stake, charging cabinet or the lighting for the offer illumination of described photovoltaic charge station.
According to a kind of preferred implementation of above-mentioned photovoltaic charge station, wherein, described charging cabinet includes the mobile energy-storage battery for mobile device, is provided with the interface for charging for described mobile energy-storage battery in described charging cabinet.
According to a kind of preferred implementation of above-mentioned photovoltaic charge station, wherein, also include: discharging rod, be used for avoiding described photovoltaic charge station to be struck by lightning；Grounding body, and described discharging rod, described in conflux lightning protection box connect.
According to a kind of preferred implementation of above-mentioned photovoltaic charge station, wherein, also include that support, described photovoltaic module array are located on support, and described support and described photovoltaic module array constitute shed structure.
A kind of preferred implementation according to above-mentioned photovoltaic charge station, wherein, described photovoltaic charge station has BIPV bicycle shed, described BIPV bicycle shed is configured to propping up by described photovoltaic module array, described photovoltaic module array is supported by described support, described support includes crossbeam, shoulder beam and column, described crossbeam and described shoulder beam interconnection form multiple grid structure, the top of described column connects described crossbeam and the cross point of described shoulder beam, and described photovoltaic module array is fixed on described grid structure.
A kind of preferred implementation according to above-mentioned photovoltaic charge station, wherein, described photovoltaic module array is directly connected with described crossbeam and described shoulder beam, constitute bicycle shed top, and utilizing silica gel sealing between the adjacent photovoltaic assembly in described photovoltaic module array, described photovoltaic module array links together by the way of parallel connection again of first connecting.
According to a kind of preferred implementation of above-mentioned photovoltaic charge station, wherein, also include: irradiance tester, be used for detecting intensity of illumination；Gauge table, is connected between described energy manager and utility grid, is used for detecting electricity；Data acquisition unit, is connected with described combining inverter, described irradiance tester, described gauge table and described energy manager, for gathering the generating information of described photovoltaic module array, illumination intensity information, energy storage discharge and recharge information, electricity use information；Data processor, is connected with described data acquisition unit, for processing the information that described data acquisition unit gathers；Display, is connected with described data processor, for showing the information processing result of described data processor.
According to a kind of preferred implementation of above-mentioned photovoltaic charge station, wherein, conflux described in lightning protection box, described data processor, described display, described energy-storage battery, described energy manager and described combining inverter is positioned in same integrated cabinet.
According to a kind of preferred implementation of above-mentioned photovoltaic charge station, wherein, also include that charging cabinet, described charging cabinet include the mobile energy-storage battery for mobile device, described charging cabinet is provided with the interface for charging for described mobile energy-storage battery；Described charging cabinet also is located in described integrated cabinet.
The present invention only includes a set of electric current converting system, and its control system is simple, convenient to carry out, the demand of different chargers reasonable in design, satisfied, reduce manufacturing cost, all can be able to run under conditions of with or without utility grid again, strong adaptability, it is simple to marketing simultaneously.
ItsIn figureSchematically illustrate the theory structure of the preferred embodiment of the present invention,As schemedShowing, what this preferred embodiment included photovoltaic module array 1, the lightning protection box 2 that confluxes, energy manager 3, combining inverter 30, energy-storage battery 5 and various ways uses electric loading.Wherein, photovoltaic module array 1 is energy conversion device, is used for converting the solar into electric energy, wherein each assembly can in parallel, series connection, in order to obtain greater power, the photovoltaic module array 1 of this preferred embodiment uses connection in series-parallel to combine, mode in parallel again of the most first connecting.The lightning protection box 2 that confluxes is connected between photovoltaic module array 1 and combining inverter 30, for converging the electric current from described photovoltaic module array, reduce the connecting line between photovoltaic module array 1 and combining inverter 30 simultaneously, maintain easily, improve reliability, it generally comprises lightning protection device/chopper, and is directly connected with combining inverter 30 by lightning protection device/chopper.Combining inverter 30 be connected to conflux lightning protection box 2, energy manager 3, with electric loading etc., the electric current conversion between plurality of devices.Energy-storage battery 5 is used for storing electric energy.Energy manager 3 is as the core of control system, it is connected to combining inverter 30, energy-storage battery 5, and for connecting with utility grid 4, with the different conditions according to electric energy, electric energy is transmitted (sometimes energy manager 3 and combining inverter 30 being collectively referred to as control system) according to different directions.It is connected to combining inverter 30 to obtain electric energy by electric loading, in this preferred embodiment, include by electric loading, but the invention is not limited in this, quick charge stake 6, charging cabinet 8 and the lighting 7 for photovoltaic charge station offer illumination, it is further preferred that charging cabinet 8 includes the mobile energy-storage battery 81 for mobile device, and charging cabinet 8 is provided with for the interface for mobile energy-storage battery 81 charging；Lighting 7 connects has time delay module and photosensitive switch to realize time control or photosensitive to automatically control.
More specifically, in the preferred embodiment, when electric energy is transmitted according to different directions by energy manager 3 according to the different conditions of electric energy, inversion can be carried out.Such as at illumination in summer barPart is goodTime, the electric energy that photovoltaic module array 1 produces is after combining inverter 30 inversion, after powering for quick charge stake 6, charging cabinet 8, lighting 7 and following data acquisition unit 31, display 34 even load, the control that may also pass through energy manager 3 is energy-storage battery 5 charging energy-storing, when electric energy still has residue afterwards, electric energy can be carried out grid-connected by its port being connected with utility grid 4 by energy manager 3, powers for utility grid 4.But in the winter time or continuous overcast and rainy time, electric energy produced by photovoltaic module array 1 cannot meet with the needs of electric loading, first mobile energy-storage battery 81 can be utilized after energy manager 3 inversion for above-mentioned load supplying, or using utility grid 4 is above-mentioned load supplying through energy manager 3, it is possible to use utility grid 4 is charged for mobile energy-storage battery 81 after energy manager 3 inversion.(when i.e. to utilize the electric energy of public electric wire net be above-mentioned load supplying, electric energy is not through combining inverter, but through the control of energy manager be directly load supplying, and the inversion function by energy manager is needed when utilizing energy-storage battery for load supplying, in addition, when utilizing electrical network electric energy for battery stores electricity energy, also through the inversion control of energy manager, i.e. energy manager, itself there is two-way inversion function such as direct current and become exchange, AC-DC.Following content to be looked at the most again, is the problem of ocr entirely
In the prior art, such as Application No. 201410672026.0, filing date 2014.1 1.20, in the patent documentation of entitled " a kind of differential voltage efficient quick charge stake circuit ", discloses a kind of concrete charging control circuit and includes that differential low pressure charging main circuit and differential low-voltage fill village？Repair control circuit: wherein, described differential is protected voltage charging main circuit and is included that the differential of multiple parallel combination detects charging in advance and repairs circuit, each described differential detects charging reparation circuit in advance and suffers from tracing detection inside battery ion arrangement situation and inertia dormancy ionic weight, the most automatically changes charge frequency and charge waveforms and repairs battery charging；
Described differential low-voltage charging repair control circuit includes the first differential charging repair control circuit and the second differential charging repair control circuit, described first differential charging repair control circuit for detection when battery electricity content is 100%, control a part of described differential in advance detect charging repair circuit stop charging；Repair in charging, described second differential charging repair control circuit for when a part of described differential in advance detect charging repair circuit stop to electricity letting out charging repair time, differential described in control another part detects charging reparation circuit in advance and continues the charging battery activated inertia dormancy ion of reparation, until the internal resistance of cell is definitely to cut out differential described in another part when 0 to detect charging reparation circuit in advance.
In the differential low-voltage efficient quick charge stake circuit that the present invention provides, described differential is protected voltage charging main circuit and is included that the differential of multiple parallel combination detects charging in advance and repairs circuit, described differential detects charging in advance and repairs circuit for tracing detection inside battery ion arrangement situation and inertia dormancy ionic weight, the most automatically change charge frequency and battery is filled up charging and repaired by charge waveforms, therefore charging process need not higher than cell voltage, circuit be charged, charging does not only have ion collision can also activate and enable inertia dormancy ion, in charging process, battery does not generates heat, rechargeable battery electricity content exceedes design nominal capacity 45%；Simultaneously, utilizing differential itself to detect performance in advance, following the tracks of inside battery inert body mesh is the internal resistance that ion is formed, and does not changes charge frequency and charging voltage less than cell voltage to fill up electron ion, not having the energy loss that ion collision causes in charging process, therefore charging conversion efficiency is more than 100%.
Described differential detects charging reparation circuit in advance and includes oscillating circuit, rectification circuit, shaping circuit and just, negative phase lock circuitry: wherein, described oscillating circuit for becoming the first Double helix ripple by city's electric oscillation, described rectification circuit is for being converted into semi-spiral ripple by described first Double helix ripple, described shaping circuit is for being shaped to the second Double helix ripple by described semi-spiral ripple, described just, negative lock is used for stoping the string pressure reverse current of cell voltage to dislocation circuit: differential thus can be utilized to follow the tracks of inside battery inertia dormancy ionic weight in advance, automatically charge frequency and Double helix ripple charge waveforms are changed, because Double helix ripple has the strongest penetration to electricity ground sheath, so charging is independent of voltage relationship, can be achieved with big electric current and quickly fill up charging, faster than original technology 6.5 times of charging rate.
Described oscillating circuit includes electric capacity C parallel with one another and resistance CR, and the one end after parallel connection connects civil power positive pole, and the other end is connected to described rectification circuit.
Described rectification circuit is bridge rectifier, and the first of this bridge rectifier is main is connected in series to civil power negative pole, and the second end is connected to described shaping circuit, and the 3rd end is connected with described oscillating circuit, and the 4th end is connected to battery cathode after described negative lock is to dislocation circuit.
Described shaping circuit includes that controllable silicon T and resistance R, the anode of described controllable silicon T are connected with described rectification circuit, and negative electrode is connected to described just locking to dislocation circuit, and described resistance R is serially connected with described silicon controlled anode and controls between pole.
Described positive and negative lock is a diode D to clamp circuit, it is connected with described shaping circuit with stating the anode just locking the diode D to clamp circuit, negative electrode is connected to collect pond positive pole, and described negative lock is connected with battery cathode to the anode of the diode D of clamp circuit, and negative electrode is connected with described whole note circuit.
Described first differential charging repair control circuit include filter circuit of pressure-stabilizing, the first reference voltage circuit, the first comparison process circuit, the first delay circuit and the first on-off circuit: wherein, described filter circuit of pressure-stabilizing for using after the voltage filter voltage stabilizing of battery as the power supply of described first comparison process circuit；Described first reference voltage circuit specially transports to described first comparison process circuit for not walking the first reference voltage well f: described first comparison process circuit is when the first reference voltage of the sampling voltage relatively preset and input is equal, output the first triggering signal is to described first on-off circuit: described first delay circuit is used for preventing the interference of battery surge voltage from producing for the first time delay: described first on-off circuit is for after described first delay time, under the described first control triggering signal, control a part of described differential and detect charging reparation circuit stopping in advance to battery charging reparation, and power to described second differential charging repair control circuit.
Described second differential charging repair control circuit includes several points of rectification circuits, second reference voltage circuit, second comparison process circuit, second delay circuit and second switch circuit: wherein, the described point rectification circuit that dissipates exports to described second comparison process circuit after the voltage of described first on-off circuit transmission is carried out rectification: described second reference voltage circuit is not for walking the second reference voltage and transmitting to described second comparison process circuit: when described second comparison process circuit is used for the second reference voltage cabinet etc. of sampling voltage and the input relatively preset, signal to the moon number is stated second switch circuit in output the second triggering；
Described second delay circuit is used for preventing the interference of battery surge voltage from producing the second delay time: described second switch circuit occupy after described second time delay, under the described second control triggering signal, differential described in control another part detects charging reparation circuit in advance and continues the charging battery activated inertia dormancy ion of reparation, until the internal resistance of cell is definitely to cut out differential described in another part when 0 to detect charging reparation circuit in advance.
Described differential low-voltage charging repair control circuit also includes pure differential circuit, and described pure differential circuit prevents reduction for continuing to revise the cell inert dormancy ion being repaired, and allows inertia dormancy ion persistently be arranged in electricly in clean property sheath.
Described differential low-voltage charging control circuit also includes circuit indicating circuit, Fisrt fault indicating circuit and the second failure indicating circuit: wherein, described power indicating circuit is for indicating the connection whether fault of mains supply and whole differential low-voltage efficient quick charge stake circuit, described second failure indicating circuit occupy a part of described differential of instruction and detects charging in advance and repair circuit whether fault, and described Fisrt fault indicating circuit is used for indicating differential described in another part to detect charging in advance repairing circuit whether fault.Along with the development of electric automobile industry is with universal, demand and requirement for matched charger (charging pile is main) the most day by day increase and improve.
For high-power charging pile, the mainstream solution of current industrySuch as figure 1Shown in, topological structure is chosen as PFC power supply, and ac input division divides employing three-phase four-wire system, forms three level inputs, and direct current output part uses half-bridge (or full-bridge) LLC, forms high pressure DC output, and former and deputy limit needs to do isolation processing.
As Figure 2Shown in, conventional power source circuit efficiency when output heavy duty (referring generally to output loading more than 50% nominal load, location A) is higher.And when being output as underloading (referring generally to load less than 50% nominal load, B position), the work efficiency of charging pile quickly reduces, waste of energy when causing underloading to charge along with the reduction of load.Power data (load-power data) under these loads is the effective evaluation metrics weighing energy consumption efficiency effect.
PFC (Power Factor Correction) is i.e. " PFC ", power factor refers to the relation between effective power and total power consumption (apparent energy), and namely effective power is divided by the ratio of total power consumption (apparent energy).PFC has two kinds at present, and one is passive PFC (also referred to as passive PFC), and one is active PFC (also symmetrical active PFC).
Active PFC is mainly made up of elements such as high-frequency inductor, switching tube, electric capacity and control IC, can simply be summarized as step-up switching power supply circuit, the feature of this circuit is structure complexity, but advantage is a lot: power factor is up to 0.99, low-loss and highly reliable, input voltage can be from 90V to 270V (wide cut input) etc., owing to output dc voltage ripple is the least, the power supply of active PFC is therefore used to need not use the most jumbo filter capacitor.
Passive PFC is usually the long-pending bigger inductance of a block, it is made up of polylith stalloy outside winding copper cash inside it, its principle is to use inductance compensation method to be reduced by phase contrast between the fundamental current making exchange input and voltage to improve power factor, the power factor of passive PFC is not the highest, can only achieve 0.7～0.8, therefore its efficiency also ratio is relatively low, and caloric value is the biggest.Passive PFC is the most not good for nothing, its simple in construction, stabilityUpper tableThe best, relatively it is suitable for low and middle-end power supply.
But, here it should also be appreciated that, " power factor " is not equal to " conversion efficiency ".Now the power factor of active 0.99 is construed to obtain the power supply conversion efficiency of 99% by some businessman, this obviously this be not to.Although being both the concept describing power saving, but for personally for the meaning of two concepts be different.PFC " power factor " height be forCountrySave money, and " conversion efficiency " height is to save money for user.
Summary of the invention
It is an object of the invention to provide a kind of high-power quick charge stake control strategy, solve prior art technical problem of waste of energy when underloading is charged.
The high-power quick charge stake control strategy of the present invention comprises the following steps:
A. using PFC power supply, ac input division divides employing three-phase four-wire system, forms three level inputs, and direct current output part uses half-bridge or full-bridge LLC, forms high pressure DC output；
B. the power signal change of high pressure DC outfan is gathered；
C., when output loading is less than the load-power data of the first setting, select to close the switching device that a phase incoming line is corresponding；
D., when output loading is less than the load-power data of the second setting, select to close the switching device that another phase incoming line is corresponding.
Further comprising the steps of:
E., when output loading is more than the load-power data of the second setting, select to open the switching device that buttoned-up arbitrary phase incoming line is corresponding；
F., when output loading is more than the load-power data of the first setting, select to open the switching device that another phase incoming line buttoned-up is corresponding.
The high-power quick charge stake control strategy of the present invention improves the whole work efficiency of charging pile, it is achieved that save the energy, changes the control logic of charging pile equipment, i.e. software design, and extra hardware puts into little, low cost.
Accompanying drawing explanation
Figure 1Circuit structure signal for charger ripe in prior artFigure；
Figure 2Typical efficiencies curve signal for charger ripe in prior artFigure；
Figure 3Efficiency curve for the present invention high-power quick charge stake control strategy is illustratedFigure。
Detailed description of the invention
Below in conjunction withAccompanying drawingThe detailed description of the invention of the present invention is described in detail.
The control strategy of the present embodiment is following steps:
A. using PFC power supply, ac input division divides employing three-phase four-wire system, forms three level inputs, and direct current output part uses half-bridge or full-bridge LLC, forms high pressure DC output；
B. the power signal change of high pressure DC outfan is gathered；
C., when output loading is less than the load-power data of the first setting, select to close the switching device that a phase incoming line is corresponding；
D., when output loading is less than the load-power data of the second setting, select to close the switching device that another phase incoming line is corresponding；
E., when output loading is more than the load-power data of the second setting, select to open the switching device that buttoned-up arbitrary phase incoming line is corresponding；
F., when output loading is more than the load-power data of the first setting, select to open the switching device that another phase incoming line buttoned-up is corresponding.
In the present embodiment, implementation strategy be according to output size adjust charging pile three-phase input switching strategy.I.e. under conditions of being output as underloading, close one to two corresponding switching devices (MOSFET or IGBT or other equivalent switch devices) of input, only retain a phase and input corresponding switching device work to biphase.Make changer realize higher work efficiency under light condition, thus reach to improve the purpose of complete machine work efficiency.
It is embodied as citing.Such as figure 1Shown circuit, its exemplary operation efficiency curveSuch as figure 2Shown in.ByFigure 2Visible, when output loading is less than the load that A point is corresponding, its work efficiency declines with load and is decreased obviously.After the load that load is corresponding less than B point, its work efficiency declines with load and drastically declines.To this, when can work as the load load corresponding less than A point, close the switching device of a phase input correspondence only retain biphase input service (As Figure 1Because three-phase input is symmetry, can optional one close, such as: retain switching device Q1, switching device Q4 and switching device Q7, switching device Q8, switching device Q10, switching device Q11 work on, closing switch device Q5, switching device Q6, switching device Q9, switching device Q12), thus improve load less than the work efficiency during load that A point is corresponding.When load is less,Such as figure 2In B point below, retain the work efficiency of biphase input service the most relatively low time, Reclosable one phase inputs (as can be switching device Q3, switching device Q4, switching device Q8, switching device Q11 be also switched off, only retain switching device Q1, switching device Q2, switching device Q7, switching device Q10 work), thus only retaining a phase input service so that the following work efficiency of B point improves further.
After such control strategy processes, product work efficiency under the conditions of underloading significantly improves.
As Figure 3Shown in, A point, B point power keep milder.
The high-power quick charge stake control strategy of the present invention can make high-power charging pile product realize high workload efficiency in underloading in heavy duty gamut, improves efficiency curve and can alleviate device loss, improving reliability.Work efficiency raising makes product heating reduce such that it is able to reduce the power of the heat dissipation equipments such as fan.Reduce energy consumption cost-effective.Improve the whole work efficiency of charging pile, save the energy.The main control logic changing equipment, i.e. software design, extra hardware puts into little, low cost.
The above; being only the present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement, all should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (2)
1. a high-power quick charge stake control strategy, comprises the following steps:
A. using PFC power supply, ac input division divides employing three-phase four-wire system, forms three level inputs, direct current
Output part uses half-bridge or full-bridge LLC, forms high pressure DC output；
B. the power signal change of high pressure DC outfan is gathered；
C., when output loading is less than the load-power data of the first setting, select to close a phase incoming line pair
The switching device answered；
D., when output loading is less than the load-power data of the second setting, select to close another phase incoming line
Corresponding switching device.
High-power quick charge stake control strategy the most as claimed in claim 1, further comprising the steps of:
E., when output loading is more than the load-power data of the second setting, select to open buttoned-up arbitrary phase
The switching device that incoming line is corresponding；
F., when output loading is more than the load-power data of the first setting, select to open another phase buttoned-up
The switching device that incoming line is corresponding.
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| CN114362562A (en) * | 2021-11-24 | 2022-04-15 | 漳州科华技术有限责任公司 | Control method of three-phase PFC circuit, terminal and storage medium |
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| 马飞: "用于电动汽车充电的三相VIENNA整流技术的研究", 《万方学位论文》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362562A (en) * | 2021-11-24 | 2022-04-15 | 漳州科华技术有限责任公司 | Control method of three-phase PFC circuit, terminal and storage medium |
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Address after: 518100 Guangdong, Baoan District, Xin'an, Shenzhen street, the new road, the left wing of the new C building, building 4, building two Applicant after: Shenzhen Lu Xun Technology Co., Ltd. Address before: Baoan District Xin'an street Shenzhen city Guangdong province 518100 two road business venture Wanyuan building 6 building 605-610 Applicant before: SHENZHEN LUXUN TIANXIA TECHNOLOGY CO., LTD. |
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Application publication date: 20160706 |