CN102361334B - Photovoltaic energy storage electric automobile charging station system and method for switching state of energy storage system - Google Patents

Photovoltaic energy storage electric automobile charging station system and method for switching state of energy storage system Download PDF

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Publication number
CN102361334B
CN102361334B CN201110314267.4A CN201110314267A CN102361334B CN 102361334 B CN102361334 B CN 102361334B CN 201110314267 A CN201110314267 A CN 201110314267A CN 102361334 B CN102361334 B CN 102361334B
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China
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energy
storage
charging station
charging
photovoltaic
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CN201110314267.4A
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Chinese (zh)
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CN102361334A (en
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杨忠亮
查晓明
申志凌
左新宇
孙建军
张胜宝
黄国平
苏天诺
柳羿
荆晓洁
周永光
李嫦艳
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广东电网公司深圳供电局
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    • 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
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The invention discloses a photovoltaic energy storage electric automobile charging station system and a method for switching working state of an energy storage system. The photovoltaic energy storage electric automobile charging station system comprises a photovoltaic system, an energy storage system, a charging system, a DC(direct current)/AC (alternating current) inverter, an AC/DC rectifier and a DC/DC converter, wherein the photovoltaic system is connected to an alternating current power distribution network by virtue of the DC/AC inverter and is connected to the energy storage system by virtue of the DC/DC converter; the energy storage system is connected to the alternating current power distribution network by virtue of the DC/AC inverter and is connected to the charging system by virtue of the DC/DC converter; and the charging system is connected to the alternating current power distribution network by virtue of the AC/DC rectifier. The method provided by the invention has the advantages that uniform scheduling on the photovoltaic system and the energy storage system in the electric automobile charging station is realized, utilization rate of the charging station to solar energy in an area is improved, and impact to a power grid by centralized charging can be effectively buffered, thus power supply stability is guaranteed, grid discharging can be realized, peak shaving of the power grid can be participated, power quality is improved, and obvious economic benefit is achieved.

Description

Photovoltaic energy storage electric automobile charging station system and energy-storage system state switching method
Technical field
The present invention relates to electric automobile charging station system and control technology field thereof, relate in particular to a kind of electric automobile charging station system and a kind of energy-storage system work state switching method that utilizes photovoltaic and energy storage technology.
Background technology
Electric automobile can be from electrical network absorbed power in the process of charging, and the AC distribution net that can connect it when the electric automobile of charging simultaneously reaches a great deal of produces active power and impacts, and affects the quality of power supply, therefore need to carry out smoothing processing to it.Also there is no at present the effective braking measure for this power rush.
For realizing the making full use of of solar energy in region, the electric automobile charging station of domestic existing existing installing photovoltaic system.In charging station in the past, after photovoltaic array changes into electric energy by solar energy, by energy-storage system, access the charging system of charging station, with network grid-connected power, it is grid-connected with electrical network or from wherein a kind of mode operation of net to be that photovoltaic system in charging station only can be selected, and can not in same seat charging station, realize the conversion of operation mode.Cannot realize improving solar energy utilization ratio and suppressing charging station taking into account grid side power rush.
And its energy of the energy-storage system of installing in this type of charging station only comes from photovoltaic system, the effect of performance is just electric automobile charging station charging when load is heavy.That is to say, energy-storage system is only as the servicing unit appearance of photovoltaic system, abundant not to the utilization of solar energy in region, also very limited to the effect of AC distribution net.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of photovoltaic energy storage electric automobile charging station system, can make electric automobile concentrate charging to obtain smoothly the caused load impact of AC distribution net, make full use of the solar energy in region, give electrical network and effectively support and coordinate, improve the overall economic benefit of electric automobile charging station.
An electric automobile charging station system, comprises photovoltaic system, energy-storage system, charging system, DC/AC inverter, AC/DC rectifier and DC/DC transducer; Described photovoltaic system is connected to AC distribution net by described DC/AC inverter, and is connected to described energy-storage system by described DC/DC transducer; Described energy-storage system connects AC distribution net by described DC/AC inverter, and is connected to described charging system by described DC/DC transducer; Described charging system connects AC distribution net by described AC/DC rectifier.
The command signal that the operating state of described energy-storage system receives according to described DC/DC transducer, described DC/AC inverter and described AC/DC rectifier is switched; Wherein, described command signal obtains according to following steps:
Obtain the data that heavy load signal, electrical network electricity price paddy phase signal and energy-storage system dump energy to charging station are monitored; According to above-mentioned Monitoring Data and energy-storage system operating state switch logic, described energy-storage system is judged the operating state entering; According to above-mentioned judged result, send described command signal.
In existing electric automobile charging station, owing to can installing the restriction of area, the photovoltaic system capacity in charging station can not configure very greatly conventionally.Photovoltaic system adopts the mode of direct grid-connected operation to bring higher economic benefit to electric automobile charging station, but cannot suppress electric automobile, concentrates the load impact causing while charging.Compared with prior art, the present invention has considered the economic benefit of charging station operation and the smoothing processing that the load impact of concentrating charging to cause is carried out, and has redesigned the Nomenclature Composition and Structure of Complexes of electric automobile charging station.Photovoltaic system is connected to AC distribution net by DC/AC inverter, and is connected to energy-storage system by DC/DC transducer.Energy-storage system connects AC distribution net by DC/AC inverter, and is connected to charging system by DC/DC transducer, between energy-storage system and electrical network, can carry out the two-way exchange of electric energy.
Consider the characteristic of peak valley price difference policy, photovoltaic rate for incorporation into the power network policy and the energy-storage system of electric energy that charging station photovoltaic system sends in one day, electrical network, control energy-storage system in energy-storage system self-charging, to charging system charging, switch under electrical network electric discharge and four kinds of operating states of hold mode.Wherein, to charging system charging, refer to that the electric energy that energy-storage system sends is delivered to charging system after the conversion of DC/DC transducer; To electrical network electric discharge, refer to that electric energy that energy-storage system sends is delivered to AC distribution after the inversion of DC/AC inverter online; Energy-storage system self-charging refers to that the electric energy on photovoltaic system is delivered to energy-storage system after changing through DC/DC transducer, or the online electric energy of AC distribution is delivered to energy-storage system afterwards through AC/DC rectifier rectification; Hold mode refers to that energy-storage system does not have electric energy to flow out and flows into.According to the switching of energy-storage system different operating state, it is grid-connected with electrical network or from the flexible conversion of net operation mode that photovoltaic system can be realized.
Compared with prior art, the present invention controls by unified coordination the to the operational modes different from energy-storage system of photovoltaic system in electric automobile charging station and operating state, has improved on the whole the overall economic benefit of charging station.Both improve the absorption efficiency of photovoltaic system to solar energy in region, made full use of clean energy resource, and can utilize again the flexible charge-discharge characteristic of energy-storage system to come level and smooth electric automobile to concentrate the grid side load impact that charges and cause.In addition, the energy-storage system in charging station can carry out two-way electric energy with AC distribution net and exchange, and participates in " peak load shifting " of electric power system, dwindles network load peak-valley difference, improves network load characteristic, guarantees the reliability of charging.
After described energy-storage system operating state is switched, again described heavy load signal, paddy phase signal and energy-storage system dump energy are monitored;
Data and energy-storage system operating state switch logic according to monitoring again, re-start judgement to described energy-storage system by the operating state entering, if judged result is with the same before, the operating state that maintains described energy-storage system is constant; If judged result, with different before, is sent command signal according to the result rejudging to described DC/DC transducer, described DC/AC inverter and described AC/DC rectifier, control the switching that described energy-storage system carries out operating state.
Under different time, different situations, control energy-storage system and switch under described four kinds of different operating states, realized unified coordination the under different operational modes and operating state to photovoltaic system in charging station and energy-storage system and controlled.By energy-storage system being discharged and recharged flexibly to the control of energy-storage system power flow, complete photovoltaic system and electrical network grid-connected or from the conversion of net operation mode simultaneously, improved photovoltaic system solar energy utilization ratio, quality and the stability of charging station power supply while having guaranteed concentrated charging, and can electrical network be supported and be coordinated.
Accompanying drawing explanation
Fig. 1 is the system configuration schematic diagram of photovoltaic energy storage electric automobile charging station system;
Fig. 2 is the energy-storage system work state switching method schematic flow diagram of photovoltaic energy storage electric automobile charging station system.
Embodiment
Refer to Fig. 1, the system configuration schematic diagram of photovoltaic energy storage electric automobile charging station system of the present invention.
The present invention has considered the economic benefit of charging station operation and the load impact of concentrating charging to cause has been carried out to smoothing processing, has redesigned the Nomenclature Composition and Structure of Complexes of electric automobile charging station.Described photovoltaic energy storage electric automobile charging station system comprises photovoltaic system 11, energy-storage system 12, charging system 13, DC/AC inverter 14, AC/DC rectifier 15 and DC/DC transducer 16,17; Described photovoltaic system 11 is connected to AC distribution net by described DC/AC inverter 14, and is connected to described energy-storage system 12 by described DC/DC transducer 16; Described energy-storage system 12 connects AC distribution net by described DC/AC inverter 14, and is connected to described charging system 13 by described DC/DC transducer 17; Described charging system 13 connects AC distribution net by described AC/DC rectifier 15.
Preferably, the switching of energy-storage system operating state can be by PC control, the Monitoring Data that host computer provides according to monitoring system and energy-storage system work state switching method judge to energy-storage system 12 operating state entering, then by sending working instruction signal to DC/AC inverter 14, AC/DC rectifier 15 and DC/DC transducer 16,17, control outflow and the inflow direction of energy-storage system 12 electric energy, and then reach the switching of controlling its operating state.
Consider the characteristic of peak valley price difference policy, photovoltaic rate for incorporation into the power network policy and the energy-storage system 12 of electric energy that charging station photovoltaic system sends in 11 1 days, electrical network, control energy-storage system 12 in energy-storage system self-charging, to charging system charging, switch under electrical network electric discharge and four kinds of operating states of hold mode.Wherein, to charging system charging, refer to that the electric energy that energy-storage system 12 sends is delivered to charging system 13 after 17 conversions of DC/DC transducer; To electrical network electric discharge, refer to that electric energy that energy-storage system 12 sends is delivered to AC distribution after 14 inversions of DC/AC inverter online; Energy-storage system self-charging refers to that the electric energy on photovoltaic system 11 is delivered to energy-storage system 12 after changing through DC/DC transducer 16, or the online electric energy of AC distribution is delivered to energy-storage system 12 afterwards through AC/DC rectifier rectification; Hold mode refers to that energy-storage system 12 does not have electric energy to flow out and flows into.
In above-mentioned photovoltaic energy storage electric automobile charging station system, between energy-storage system 12 and electrical network, can carry out the two-way exchange of electric energy.Simultaneously, photovoltaic system 11 is connected with electrical network and energy-storage system 12 with DC/DC transducer 16 by DC/AC inverter 14 respectively, according to the switching of energy-storage system 12 operating states, photovoltaic system 11 can be realized the flexible conversion of or off-grid operation mode grid-connected with electrical network.
Compared with prior art, the present invention controls by unified coordination the to photovoltaic system in electric automobile charging station 11 operational modes different from energy-storage system 12 and operating state, has improved on the whole the overall economic benefit of charging station.Both the absorption efficiency that had improved solar energy in 11 pairs of regions of photovoltaic system, makes full use of clean energy resource, can utilize again the flexible charge-discharge characteristic of energy-storage system 12 to come level and smooth electric automobile to concentrate the grid side load impact that charges and cause.In addition, the energy-storage system 12 in charging station can carry out two-way electric energy with AC distribution net and exchange, and participates in " peak load shifting " of electric power system, dwindles network load peak-valley difference, improves network load characteristic, guarantees the reliability of charging.
Energy-storage system 12 described in the present invention in electric automobile charging station system comprises batteries and the on-off controller of some capacity; Charging system 13 comprises charger and charging pile.In addition, high pressure relaying protection cabinet, three-phase transformer and low pressure relaying protection cabinet access charging station system are crossed by AC distribution Netcom; Illuminator is connected 380V ac bus with supervisory control system, supervisory control system completes the control to the monitoring of each equipment running status of charging station and action, in order to instruct the operation of whole charging station.
The energy storage technology relating in the present invention refers to that by certain device, converting electric energy to other is convenient to the form of energy storing, when needed the quick controlled technology that converts thereof into desired form.Common energy storage mode comprises batteries to store energy, super capacitor energy-storage, flywheel energy storage etc. at present.The present invention chooses batteries as energy-accumulating medium, is because the energy conversion efficiency of batteries is higher, and in the limited construction area of electric automobile charging station, is convenient to place, and extendible capacity is good.
Described whole system operates under the electric pressure of 380V, by 10kV electrical network through transformer-supplied.What photovoltaic system 11 sent is direct current, after 16 conversions of DC/DC transducer, connects energy-storage system 12, and the two connects DC/AC inverter 14 jointly, and direct current energy is connected on the 380V ac bus of electric power system through after inversion.Electric energy on 0.4kV ac bus is through connecing the Vehicular accumulator cell charging that charging system 13 is electric automobile after 15 rectifications of AC/DC rectifier, the electric energy of energy-storage system 12 also can connect charging system 13 chargings after 17 conversions of DC/DC transducer, and the energy between the two can two-way exchange.In addition, be connected to the firm demands such as the lighting apparatus that maintains in addition the normal operation of charging station on 0.4kV ac bus, supervisory control system.
Photovoltaic system 11 should be laid on the roof of charging station main building, to make full use of limited land area.Be limited to the size that can lay area in station, the capacity of photovoltaic system 11 is basic definite.The configuration relation of energy-storage system 12 capacity, to the effect of level and smooth load effect, therefore must be planned as a whole, consider carefully.The principle of energy-storage system 12 capacity configurations described in the present invention comprises:
Energy-storage system 12 minimal configuration capacity should be able to store the power capacity that the photovoltaic system in lower charging station sends for 11 1 days;
In the large charging station of vehicle flowrate, the capacity of energy-storage system 12 is greater than total electric weight of all automobiles that in charging station, whole day is charged;
In the not too large charging station of vehicle flowrate, the capacity of energy-storage system 12 is greater than total electric weight of the automobile charging in phase charging station commuter rush hour;
Should, according to electric automobile and charging station development plan, to energy-storage system 12, carry out dilatation timely and appropriately.
Refer to Fig. 2, Fig. 2 is the energy-storage system work state switching method schematic flow diagram of photovoltaic energy storage electric automobile charging station system.The method that photovoltaic energy storage electric automobile charging station energy-storage system operating state of the present invention is switched comprises the following steps:
S201 monitors the heavy load signal of charging station, electrical network electricity price paddy phase signal and energy-storage system dump energy;
S202, according to above-mentioned Monitoring Data and energy-storage system operating state switch logic, judges to described energy-storage system the operating state entering;
S203 sends command signal according to above-mentioned judged result to described DC/DC transducer, described DC/AC inverter and described AC/DC rectifier, controls the switching of described energy-storage system operating state.
Photovoltaic energy storage electric automobile charging station system carries out device initialize and supervisory control system self check after starting, and self check is monitored by the dump energy of rear counterweight load signal, paddy phase signal and energy-storage system 12, and in real time data is reported to host computer.
Host computer is according to above-mentioned Monitoring Data, according to following energy-storage system operating state switch logic, determines that now energy-storage system 12 is by the operating state entering:
After supervisory control system is started working, first monitor the dump energy of energy-storage system 12;
If the dump energy of the described energy-storage system 12 of monitoring is below the first preset value, preferably, this first preset value is set as to 5%, judge that described energy-storage system 12 is energy-storage system self-charging by the operating state entering, if the described energy-storage system dump energy of monitoring surpasses the first preset value 5%, further monitor charging station and whether have described heavy load signal;
If monitor charging station, there is described heavy load signal, judge described energy-storage system 12 by the operating state entering for to charge to charging system, if do not monitor the described heavy load signal of charging station, further monitor charging station and whether have described paddy phase signal;
If monitor charging station, there is described paddy phase signal, again monitor the dump energy of the described energy-storage system 12 of charging station, if described energy-storage system dump energy surpasses the second preset value, preferably, this second preset value is set as to 95%, judge that described energy-storage system 12 is hold mode by the operating state entering, if do not surpass the second preset value 95%, judge that described energy-storage system 12 is energy-storage system self-charging by the operating state entering; Wherein, described paddy phase signal refers to that clock enters into the electricity price paddy phase of grid company regulation;
If do not monitor signal of described paddy phase of charging station, judge described energy-storage system 12 by the operating state entering for to discharge to electrical network.
After host computer judgement, send working instruction signal to DC/DC transducer 16,17, DC/AC inverter 14 and AC/DC rectifier 15, control outflow or the inflow direction of energy-storage system 12 electric energy, to complete the switching to energy-storage system 12 operating states.
Preferably, at described energy-storage system 12, complete above-mentioned action and maintain an operating state after 10 minutes, supervisory control system circulatory monitoring, monitors the dump energy of described heavy load signal, paddy phase signal and energy-storage system 12 again;
Data and energy-storage system operating state switch logic according to monitoring again, re-start judgement to described energy-storage system 12 by the operating state entering, if judged result is with the same before, the operating state that maintains described energy-storage system is constant; If judged result, with different before, is sent command signal according to the result rejudging to described DC/DC transducer 16,17, described DC/AC inverter 14 and described AC/DC rectifier 15, control the switching that described energy-storage system carries out operating state.
The object of doing is like this in order to prevent that electric automobile charging station from entering suddenly heavy load state within the extremely short time, then excision rapidly again, avoid energy-storage system 12 operating states to switch too continually, increased the useful life of energy-storage system 12, improved the reliability of system.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.

Claims (5)

1. a photovoltaic energy storage electric automobile charging station system, is characterized in that, comprises photovoltaic system, energy-storage system, charging system, DC/AC inverter, AC/DC rectifier and DC/DC transducer; Described photovoltaic system is connected to AC distribution net by described DC/AC inverter, and is connected to described energy-storage system by described DC/DC transducer; Described energy-storage system connects AC distribution net by described DC/AC inverter, and is connected to described charging system by described DC/DC transducer; Described charging system connects AC distribution net by described AC/DC rectifier;
The command signal that the operating state of described energy-storage system receives according to described DC/DC transducer, described DC/AC inverter and described AC/DC rectifier is switched; Wherein, described command signal obtains according to following steps:
Obtain the data that heavy load signal, electrical network electricity price paddy phase signal and energy-storage system dump energy to charging station are monitored; According to above-mentioned Monitoring Data and energy-storage system operating state switch logic, described energy-storage system is judged the operating state entering; According to above-mentioned judged result, send described command signal.
2. photovoltaic energy storage electric automobile charging station system as claimed in claim 1, is characterized in that, also comprises supervisory control system, and described supervisory control system connects AC distribution net.
3. photovoltaic energy storage electric automobile charging station system as claimed in claim 1, is characterized in that, also comprises illuminator, and described illuminator connects AC distribution net.
4. photovoltaic energy storage electric automobile charging station system as claimed in claim 1, is characterized in that, described energy-storage system is usingd batteries as energy-accumulating medium.
5. photovoltaic energy storage electric automobile charging station system as claimed in claim 1, is characterized in that, described energy-storage system operating state switch logic comprises:
If the described energy-storage system dump energy of monitoring is below the first preset value, judge that described energy-storage system is energy-storage system self-charging by the operating state entering, if the described energy-storage system dump energy of monitoring surpasses the first preset value, further monitor charging station and whether have described heavy load signal; Wherein, described energy-storage system self-charging refers to that the electric energy on described photovoltaic system is delivered to described energy-storage system afterwards through described DC/DC transducer conversion, or the online electric energy of AC distribution is delivered to described energy-storage system afterwards through described AC/DC rectifier rectification;
If monitor charging station, there is described heavy load signal, judge described energy-storage system by the operating state entering for to charge to charging system, if do not monitor the described heavy load signal of charging station, further monitor charging station and whether have described paddy phase signal; Wherein, describedly to charging system charging, refer to that the electric energy that described energy-storage system sends is delivered to described charging system after described DC/DC transducer conversion;
If monitor charging station, there is described paddy phase signal, again monitor the described energy-storage system dump energy of charging station, if described energy-storage system dump energy surpasses the second preset value, judge that described energy-storage system is hold mode by the operating state entering, if do not surpass the second preset value, judge that described energy-storage system is energy-storage system self-charging by the operating state entering; Wherein, described paddy phase signal refers to that clock enters into the electricity price paddy phase of grid company regulation, and described hold mode refers to that described energy-storage system does not have electric energy to flow out and flows into;
If do not monitor signal of described paddy phase of charging station, judge described energy-storage system by the operating state entering for to discharge to electrical network; It is wherein, described that to electrical network electric discharge, to refer to that electric energy that described energy-storage system sends is delivered to AC distribution after the inversion of described DC/AC inverter online.
CN201110314267.4A 2011-10-17 2011-10-17 Photovoltaic energy storage electric automobile charging station system and method for switching state of energy storage system CN102361334B (en)

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