CN105186504A - System and method of controlling distributed electric vehicle charging pile to adjust power grid frequency - Google Patents

System and method of controlling distributed electric vehicle charging pile to adjust power grid frequency Download PDF

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CN105186504A
CN105186504A CN201510608480.4A CN201510608480A CN105186504A CN 105186504 A CN105186504 A CN 105186504A CN 201510608480 A CN201510608480 A CN 201510608480A CN 105186504 A CN105186504 A CN 105186504A
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frequency
charging pile
charging
operation management
management system
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CN105186504B (en
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于大洋
陈泓名
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Shandong University
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Shandong University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles
    • Y02T90/167—Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
    • Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
    • Y04S30/12—Remote or cooperative charging

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention discloses a system and method of controlling a distributed electric vehicle charging pile to adjust a power grid frequency. The system comprises a charging operation management system, frequency measurement terminals and distributed charging piles. A control strategy comprises the low frequency load shedding control and the load recovery control. According to the present invention, the purposes of changing the load of a power grid and adjusting the frequency of the power grid can be achieved by utilizing a lot of installed distributed cart, tricycle and four-wheeler charging piles and controlling the charging of the charging piles, the power supply interruption of the general users at the frequency fluctuation can be reduced, and the service capability of the electric vehicle charging is increased.

Description

Control the system and method that distributed charging pile for electric vehicle carries out mains frequency adjustment
Technical field
The present invention relates to mains frequency control technology field, particularly relate to and a kind ofly control the system and method that distributed charging pile for electric vehicle carries out mains frequency adjustment.
Background technology
FREQUENCY CONTROL is the important content of electric power system regulation and control.Sustain pulse frequency is stable is ensure that power system safety and stability runs, and improves the important goal of the quality of power supply.Power system frequency regulates to be needed to adjust frequency by regulating system is meritorious.Existing control method comprises that regulator generator is exerted oneself, Load Shedding According To Frequency, high-frequency cutting machine.
Along with the development of electric motor car industry, the permeability of electric motor car charging load in power distribution network improves gradually.A large amount of distributed electric bicycles, tricycle and carriage charging pile are installed in present city.Electric motor car charging control response speed is fast, interrupts insensitive to power failure, and it has the advantage that spatial load forecasting is carried out in response frequency change.But single charging pile power is low, for each charging pile configuration frequency measurement mechanism does not possess skills economy, and when frequency change, the action simultaneously of a large amount of electric automobile lacks concertedness, normally may run cause harmful effect to system.A kind of reasonably method is not yet had to carry out FREQUENCY CONTROL by regulating electric motor car charging.
Summary of the invention
Object of the present invention is exactly to solve the problem, and provides and a kind ofly controls the system and method that distributed charging pile for electric vehicle carries out mains frequency adjustment.This system and method utilizes a large amount of distributed electric bicycle, tricycle and the carriage charging pile installed, by controlling charging pile charging, and the object realize regulating network load, regulating mains frequency.
To achieve these goals, the present invention adopts following technical scheme:
Control the system that distributed charging pile for electric vehicle carries out mains frequency adjustment, comprising:
Charging operation management system: the frequency measurement information of receive frequency measuring terminals, receives the monitor message that distributed charging pile is uploaded, issues control information to distributed charging pile;
Frequency measurement terminal: for measuring system frequency information; To charging operation management system upload frequencies metrical information;
Distributed charging pile: for electric motor car provides charging service, uploads monitor message to charging operation management system, receives the control information that charging operation management system issues.
Described monitor message comprise charging pile charged state, charge power, whether respond and stop charging signals information.
Described charging operation management system and frequency measurement terminal are by wire communication, and described charging operation management system and distributed charging pile pass through radio communication.
Described system frequency information comprises real-time frequency size and frequency change rate.
Control the method that distributed charging pile for electric vehicle carries out mains frequency regulating system, comprise the following steps:
(1) monitor message that the operation management system that charges is uploaded by reception distributed charging pile obtains adjustable charging pile quantity;
(2) the frequency measurement information real time computation system frequency information that the operation management system that charges is uploaded by receive frequency measuring terminals;
(3) system frequency f is judged twhether lower than initiation culture f sta; If so, then the frequency measurement information real time computation system frequency information that the operation management system that charges is uploaded by receive frequency measuring terminals; Otherwise, terminate this mains frequency and regulate;
(4) after the real time computation system frequency information of step (3), system frequency f is judged twhether higher than recovery frequency f rec; If so, then recover, because of the charging pile of UFLS excision, to enter step (5) by round; Otherwise, judge that whether system frequency is lower than end frequency f end, enter step (7);
(5) by round recover because of UFLS excision charging pile after, judge because of UFLS excision charging pile whether full recovery is powered;
(6) if because of UFLS excision charging pile whether full recovery is powered, then mains frequency regulate terminate; Otherwise, return step (3) and rejudge system frequency f twhether lower than initiation culture f sta;
(7) system frequency f tif lower than end frequency f end, calculate according to frequency measurement and frequency change rate the charging pile quantity needing excision; Otherwise, return step (3) and rejudge system frequency f twhether lower than initiation culture f sta;
(8), after obtaining the charging pile quantity of needs excision, the excision power information according to calculating issues load shedding instruction to charging device, then returns step (3) and rejudges system frequency f twhether lower than initiation culture f sta.
In described step (2), system frequency f tget the mean value of each measuring terminals frequency measurement:
f t = Σ 1 N f i N ;
Wherein, f tfor system frequency measured value, N is frequency measurement terminal quantity, f ifor the frequency measurement of frequency measurement terminal i.
In described step (4), charging operation management system by round to the method that the charging pile stopped because of low frequency load shedding recovers is:
Every round drops into the charging pile quantity N of payload according to the original charged state of system tolcalculate:
N hf＝γN tol，pre；
Wherein, N hffor recovering charging pile quantity, γ is tuning coefficient, N tol, prefor the charging pile quantity of original charged state.
In described step (4), charging operation management system selects the charging pile that will recover according to charging pile load restoration priority, and charging operation management system issues recovery charging instruction to the charging pile that will recover.
In described step (7), charging operation management system calculates the charging pile quantity of needs excision concrete grammar according to frequency measurement and frequency change rate is:
N s h e d = [ α df t d t + β ( f t - f N ) ] N t o l ;
Wherein, N shedfor system cuts charging pile quantity, α, β are tuning coefficient, f tfor system frequency measured value, df t/ dt is system frequency rate of change measured value, f nfor frequency rated value, N tolfor system is in the charging pile quantity of charged state.
The mean value of each measuring terminals frequency change rate measured value got by system frequency rate of change measured value:
df t / d t = Σ 1 N df i / d t N ;
Wherein, df t/ dt is system frequency rate of change measured value, and N is frequency measurement terminal quantity, df i/ dt is the frequency change rate measured value of frequency measurement terminal i.
In described step (7), the method calculating the charging pile quantity of needs excision is:
Charging operation management system selects the charging pile that will excise according to charging pile load excision priority; Charging operation management system issues excision charging instruction to the charging pile that will excise.
Beneficial effect of the present invention:
The present invention can utilize a large amount of distributed electric bicycle, tricycle and the carriage charging pile installed, by controlling charging pile charging, realizing regulating network load, regulating the object of mains frequency.
Controlled by low frequency load shedding and load restoration control strategy decreases frequency fluctuation time power failure to domestic consumer, improve power supply reliability.Add the service ability of electric motor car charging, extra returns can be brought for electric motor car charging.
Accompanying drawing explanation
Fig. 1 is system configuration schematic diagram of the present invention.
Fig. 2 is that information of the present invention transmits schematic diagram.
Fig. 3 is that set of frequency of the present invention and active region arrange schematic diagram.
Fig. 4 is system cloud gray model schematic diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
As depicted in figs. 1 and 2, control the system configuration that distributed charging pile for electric vehicle carries out mains frequency adjustment to comprise: charging operation management system, frequency measurement terminal, distributed charging pile.
Charging operation management system is System Control Center.Described charging operation management system function comprises: the frequency measurement information of receive frequency measuring terminals, receives the monitor message that distributed charging pile is uploaded, issues control information to distributed charging pile.
Frequency measurement terminal is the frequency measuring equipment of system, and frequency measurement termination function is to charging operation management system upload frequencies metrical information.Frequency measurement information comprises real-time frequency size f and frequency change rate df/dt.
Distributed charging pile provides the electrically-charging equipment of charging service for electric motor car.Distributed charging pile function comprises: upload monitor message to charging operation management system, receives the control information that charging operation management system issues, manages the charging device of itself.Described monitor message comprise charging pile charged state, charge power, whether respond and stop charging signals information.
Charging operation management system and frequency measurement terminal pass through wire communication.Charging operation management system and distributed charging pile pass through radio communication.
The concrete control strategy of the present invention is:
Control method control strategy that distributed charging pile for electric vehicle carries out mains frequency adjustment to comprise low frequency load shedding and control and load restoration control.
System frequency measured value f tget the mean value of each measuring terminals frequency measurement:
f t = Σ 1 N f i N
In formula, f tfor system frequency measured value, N is frequency measurement terminal quantity, f ifor the frequency measurement of frequency measurement terminal i.
System frequency rate of change gets the mean value of each measuring terminals frequency change rate measured value:
df t / d t = Σ 1 N df i / d t N
In formula, df t/ dt is system frequency rate of change measured value, and N is frequency measurement terminal quantity, df i/ dt is the frequency change rate measured value of frequency measurement terminal i.
Low frequency load shedding controls at system frequency measured value f tlower than initiation culture f stashi Qidong.Described low frequency load shedding controls to be cut charging pile quantity for the operation management system that charges is calculated in real time by the frequency measurement information of frequency measurement terminal.
System cuts charging pile quantity:
N s h e d = [ α df t d t + β ( f t - f N ) ] N t o l
In formula, N shedfor system cuts charging pile quantity, α, β are tuning coefficient, f tfor system frequency measured value value, df t/ dt is system frequency rate of change measured value, f nfor frequency rated value, N tolfor system is in the charging pile quantity of charged state.
System cutting load is spaced apart Δ t operate time 1.
Charging operation management system cuts charging pile quantity N according to what calculate in real time shedthe charging pile of excision charged state.When frequency retrieval is to terminating frequency f endtime, stop cutting load action.
Load restoration controls as working as system frequency f trise above recovery frequency f rectime, the charging pile because of low cut is dropped into by round.When frequency measurement is less than recovery frequency f rectime stop charging pile drop into, until frequency is greater than recovery frequency f rec.The charging pile quantity of each input is N hf.Dropping into interval time is Δ t 2.
Every round drops into the charging pile quantity N of payload according to the original charged state of system tolcalculate:
N hf＝γN tol，pre
In formula, N hffor recovering charging pile quantity, γ is tuning coefficient, N tol, prefor the charging pile quantity of original charged state.
Low frequency load shedding select to stop the charging pile method of charging for: charging operation system selects the charging pile that will excise according to charging pile load excision priority.Charging operation system issues excision charging instruction to the charging pile that will excise.
Load restoration control method for: charging operation system selects the charging pile that will excise according to charging pile load restoration priority.Charging operation system issues excision charging instruction to the charging pile that will recover.
The desirable one group of coefficient of the present invention is as table 1.
One group of parameter that table 1 the present invention is desirable
Parameter Value Parameter Value
Initiation culture f sta 49.25Hz Tuning coefficient α 0.4
Terminate frequency f end 49.8Hz Tuning coefficient β 0.25
Recover frequency f rec 49.9Hz Interval time Δ t 1 10s
Tuning coefficient γ 0.02 Interval time Δ t 2 10s
As shown in Figure 3 and Figure 4, specific embodiment of the invention step is:
(1) monitor message that the operation management system that charges is uploaded by reception distributed charging pile obtains adjustable charging pile quantity;
(2) the frequency measurement information real time computation system frequency information that the operation management system that charges is uploaded by receive frequency measuring terminals;
(3) system frequency f is judged twhether lower than initiation culture f sta;
(4) if system frequency f tlower than initiation culture f sta, the frequency measurement information real time computation system frequency information that charging operation management system is uploaded by receive frequency measuring terminals, otherwise terminate, this flow process from newly;
(5) after the real time computation system frequency information of step (4), system frequency f is judged twhether higher than recovery frequency f rec;
(6) if system frequency f thigher than recovery frequency f recthen recover, because of the charging pile of UFLS excision, to enter step (7) by round, otherwise judge that whether system frequency is lower than end frequency f end, enter step 9;
(7) by round recover because of UFLS excision charging pile after, judge because of UFLS excision charging pile whether full recovery is powered;
(8) if because of UFLS excision charging pile full recovery power; terminate, this flow process from newly, otherwise the frequency measurement information real time computation system frequency information link that the charging operation management system entering step 4 is uploaded by receive frequency measuring terminals;
(9) system frequency f tif lower than end frequency f end, calculate excision charging pile quantity according to frequency measurement and frequency change rate, otherwise the frequency measurement information real time computation system frequency information that the charging operation management system entering step (4) is uploaded by receive frequency measuring terminals;
(10) after calculating excision charging pile quantity according to frequency measurement and frequency change rate, excision power information according to calculating issues load shedding instruction to charging device, the frequency measurement information real time computation system frequency information that the charging operation management system then entering step (4) is uploaded by receive frequency measuring terminals.
The control distributed charging pile that the present invention proposes carries out the method for mains frequency adjustment, can participate in the implementation that power system frequency controls to provide a kind of technically reliable, economical rationality for electric motor car charging.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still in protection scope of the present invention.

Claims (10)

1. control the system that distributed charging pile for electric vehicle carries out mains frequency adjustment, it is characterized in that, comprising:
Charging operation management system: the frequency measurement information of receive frequency measuring terminals, receives the monitor message that distributed charging pile is uploaded, issues control information to distributed charging pile;
Frequency measurement terminal: for measuring system frequency information; To charging operation management system upload frequencies metrical information;
Distributed charging pile: for electric motor car provides charging service, uploads monitor message to charging operation management system, receives the control information that charging operation management system issues.
2. a kind ofly control the system that distributed charging pile for electric vehicle carries out mains frequency adjustment as claimed in claim 1, it is characterized in that, described charging operation management system and frequency measurement terminal are by wire communication, and described charging operation management system and distributed charging pile pass through radio communication.
3. a kind ofly control the system that distributed charging pile for electric vehicle carries out mains frequency adjustment as claimed in claim 1, it is characterized in that, described system frequency information comprises real-time frequency size and frequency change rate.
4. the distributed charging pile for electric vehicle of control as claimed in claim 1 carries out a method for mains frequency regulating system, it is characterized in that, comprises the following steps:
(1) monitor message that the operation management system that charges is uploaded by reception distributed charging pile obtains adjustable charging pile quantity;
(2) the frequency measurement information real time computation system frequency information that the operation management system that charges is uploaded by receive frequency measuring terminals;
(3) system frequency f is judged twhether lower than initiation culture f sta; If so, then the frequency measurement information real time computation system frequency information that the operation management system that charges is uploaded by receive frequency measuring terminals; Otherwise, terminate this mains frequency and regulate;
(4) after the real time computation system frequency information of step (3), system frequency f is judged twhether higher than recovery frequency f rec; If so, then recover, because of the charging pile of UFLS excision, to enter step (5) by round; Otherwise, judge that whether system frequency is lower than end frequency f end, enter step (7);
(5) by round recover because of UFLS excision charging pile after, judge because of UFLS excision charging pile whether full recovery is powered;
(6) if because of UFLS excision charging pile whether full recovery is powered, then mains frequency regulate terminate; Otherwise, return step (3) and rejudge system frequency f twhether lower than initiation culture f sta;
(7) system frequency f tif lower than end frequency f end, calculate according to frequency measurement and frequency change rate the charging pile quantity needing excision; Otherwise, return step (3) and rejudge system frequency f twhether lower than initiation culture f sta;
(8), after obtaining the charging pile quantity of needs excision, the excision power information according to calculating issues load shedding instruction to charging device, then returns step (3) and rejudges system frequency f twhether lower than initiation culture f sta.
5. a kind ofly control the method that distributed charging pile for electric vehicle carries out mains frequency regulating system as claimed in claim 4, it is characterized in that, in described step (2), system frequency f tget the mean value of each measuring terminals frequency measurement.
6. a kind ofly control the method that distributed charging pile for electric vehicle carries out mains frequency regulating system as claimed in claim 4, it is characterized in that, in described step (4), charging operation management system by round to the method that the charging pile stopped because of low frequency load shedding recovers is:
Every round drops into the charging pile quantity N of payload according to the original charged state of system tolcalculate; Namely recover charging pile quantity and equal the charging pile quantity of original charged state and the product of tuning coefficient.
7. a kind ofly control the method that distributed charging pile for electric vehicle carries out mains frequency regulating system as claimed in claim 4, it is characterized in that, in described step (4), charging operation management system selects the charging pile that will recover according to charging pile load restoration priority, charging operation management system issues recovery charging instruction to the charging pile that will recover.
8. a kind ofly control the method that distributed charging pile for electric vehicle carries out mains frequency regulating system as claimed in claim 4, it is characterized in that, in described step (7), charging operation management system calculates the charging pile quantity of needs excision concrete grammar according to frequency measurement and frequency change rate is:
N s h e d = [ α df t d t + β ( f t - f N ) ] N t o l ;
Wherein, N shedfor system cuts charging pile quantity, α, β are tuning coefficient, f tfor system frequency measured value, df t/ dt is system frequency rate of change measured value, f nfor frequency rated value, N tolfor system is in the charging pile quantity of charged state.
9. a kind ofly control the method that distributed charging pile for electric vehicle carries out mains frequency regulating system as claimed in claim 8, it is characterized in that, the mean value of each measuring terminals frequency change rate measured value got by system frequency rate of change measured value:
df t / d t = Σ 1 N df i / d t N ;
Wherein, df t/ dt is system frequency rate of change measured value, and N is frequency measurement terminal quantity, df i/ dt is the frequency change rate measured value of frequency measurement terminal i.
10. a kind ofly control the method that distributed charging pile for electric vehicle carries out mains frequency regulating system as claimed in claim 8, it is characterized in that, in described step (7), calculating needs the method for the charging pile quantity of excision to be:
Charging operation management system selects the charging pile that will excise according to charging pile load excision priority; Charging operation management system issues excision charging instruction to the charging pile that will excise.
CN201510608480.4A 2015-09-22 2015-09-22 The distributed charging pile for electric vehicle of control carries out the system and method for mains frequency regulation Active CN105186504B (en)

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Cited By (4)

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CN107579530A (en) * 2017-09-28 2018-01-12 广西大学 The low frequency deloading method and low-frequency load reduction control system of a kind of power network
CN108407636A (en) * 2018-02-08 2018-08-17 国电南瑞科技股份有限公司 A kind of electric vehicle local real-time optimization charge control method
CN108973752A (en) * 2018-08-15 2018-12-11 国网浙江省电力有限公司杭州供电公司 A kind of orderly charging management system of charging station and method
CN110692175A (en) * 2017-05-16 2020-01-14 豪倍公司 Electric vehicle charger with load shedding

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CN104253444A (en) * 2014-10-11 2014-12-31 国家电网公司 Control system for grid frequency of large-scale charging station
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CN102541010A (en) * 2012-01-06 2012-07-04 中国电力科学研究院 Monitoring system for electric automobile and control method thereof
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CN110692175A (en) * 2017-05-16 2020-01-14 豪倍公司 Electric vehicle charger with load shedding
CN110692175B (en) * 2017-05-16 2024-02-02 豪倍公司 Electric vehicle charger with load shedding
CN107579530A (en) * 2017-09-28 2018-01-12 广西大学 The low frequency deloading method and low-frequency load reduction control system of a kind of power network
CN107579530B (en) * 2017-09-28 2020-07-10 广西大学 Low-frequency load shedding method and low-frequency load shedding control system for power grid
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CN108973752A (en) * 2018-08-15 2018-12-11 国网浙江省电力有限公司杭州供电公司 A kind of orderly charging management system of charging station and method
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