CN111490576A - Charging station power allocation method suitable for demand response - Google Patents

Charging station power allocation method suitable for demand response Download PDF

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Publication number
CN111490576A
CN111490576A CN202010376129.8A CN202010376129A CN111490576A CN 111490576 A CN111490576 A CN 111490576A CN 202010376129 A CN202010376129 A CN 202010376129A CN 111490576 A CN111490576 A CN 111490576A
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China
Prior art keywords
charging
electric automobile
demand response
electric
charging power
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CN202010376129.8A
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Chinese (zh)
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CN111490576B (en
Inventor
苏志鹏
邱朝明
范晋衡
曲大鹏
江迪
刘琦颖
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Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/63—Monitoring or controlling charging stations in response to network capacity
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/12—Electric charging stations

Abstract

The method comprises the steps of receiving a demand response request signal of a power grid side, detecting participation demand response quantity of a charging station according to the demand response request signal, executing a load increasing algorithm and a load decreasing algorithm according to the demand response request signal, and outputting a charging power control command to an energy storage system and a charging pile, so that the energy storage system and the charging pile can respond to demand events of the power grid side, peak clipping and valley filling are performed on the power grid, meanwhile, the operation cost of the charging station can be reduced, and the distribution network scheduling flexibility is improved.

Description

Charging station power allocation method suitable for demand response
Technical Field
The present application relates to the field of power control technologies, and in particular, to a charging station power allocation method suitable for demand response.
Background
With the increasingly excited contradiction between economic development and energy supply and environmental pollution, energy conservation and consumption reduction become the urgent problems to be solved in the continuous development of the economy of all countries in the world. Electric vehicles are widely used due to the advantages of fuel saving, environmental protection and high efficiency, and electric vehicle charging stations are important infrastructure for promoting the industrialization and the commercial development of the electric vehicles, and are used for absorbing energy from a power grid to control the charging and discharging of the electric vehicles. The inventor finds that the current demand response capability of the charging station participating in the power system is low in the process of realizing the traditional technology, so that the operation cost of the charging station is high.
Disclosure of Invention
In view of the above, it is necessary to provide a charging station power allocation method suitable for demand response, which can perform power allocation according to a demand response request event of an electric power system to reduce operation cost.
A charging station power allocation method suitable for demand response, wherein the charging station comprises an energy storage system and a plurality of charging piles, and the charging piles and the energy storage system are used for charging electric vehicles, the method comprises the following steps:
receiving a demand response request signal;
calculating participation demand response quantity of the charging station according to the demand response request signal;
executing a demand response algorithm according to the demand response request signal and the participation demand response quantity of the charging station, wherein the demand response algorithm comprises a load increasing algorithm and a load reducing algorithm;
and outputting a charging power control command to the energy storage system and the charging pile according to the demand response algorithm.
In one embodiment, the executing of the demand response algorithm according to the demand response request signal and the participation demand response amount of the charging station includes:
when the demand response request signal is an electric quantity increasing signal, executing the load increasing algorithm;
the load increasing algorithm comprises the following steps:
acquiring state data of the electric automobile, wherein the state data of the electric automobile comprises the type of a charging pile accessed by the electric automobile, the charging time of the charging pile accessed by the electric automobile and the actual charging power of the electric automobile;
and sequentially controlling the charging power of the electric automobile to be increased according to a preset priority and the state data of the electric automobile, and gradually judging whether the increased electric quantity after the charging power is increased meets the participation demand response quantity.
In one embodiment, the charging power of the electric automobile is divided into a first gear to a D gear, the charging power corresponding to the first gear to the D gear is increased progressively, wherein D is an integer greater than 1;
sequentially controlling the charging power of the electric automobile to be increased according to a preset priority and the state data of the electric automobile, and gradually judging whether the increased electric quantity after the charging power is increased meets the participation demand response quantity comprises the following steps:
sequentially carrying out upshifting operation on the charging power gears of the electric automobile according to a preset priority order on the electric automobile which is connected into the direct current charging pile and has the actual charging power less than or equal to a first gear so as to improve the charging power of the electric automobile;
gradually judging whether the increased electric quantity of the charging station after adjustment meets the participation demand response quantity;
if yes, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, sequentially performing up-shifting operation on the charging power gears of the electric automobile according to a preset priority order on the electric automobile which is connected to the alternating current charging pile and has the actual charging power less than or equal to a first gear so as to improve the charging power of the electric automobile;
gradually judging whether the increased electric quantity of the charging station after adjustment meets the participation demand response quantity;
if yes, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, responding the residual electric quantity of the charging station participating in the demand response by the energy storage system.
In one embodiment, the preset priorities include: the charging time of the access charging pile is longer, the priority of the electric automobile is higher than the priority of the electric automobile, the charging time of the access charging pile is shorter, and the priority of the electric automobile is higher than the priority of the access charging pile.
In one embodiment, the executing of the demand response algorithm according to the demand response request signal and the participation demand response amount of the charging station includes:
executing the load shedding algorithm when the demand response request signal includes a reduced charge signal;
the load shedding algorithm comprises:
acquiring state data of the electric automobile, wherein the state data of the electric automobile comprises the type of a charging pile accessed by the electric automobile, the charging time of the charging pile accessed by the electric automobile, the actual charging power of the electric automobile and the charge state of a battery of the electric automobile;
and sequentially controlling the reduction of the charging power of the electric automobile according to the preset priority and the state data of the electric automobile, and gradually judging whether the load rate of a distribution transformer of the charging station meets the preset requirement after the charging power is reduced.
In one embodiment, sequentially controlling the charging power of the electric vehicle to be reduced according to a preset priority, and successively judging whether the load factor of the distribution transformer of the charging station after the charging power is reduced meets a preset requirement includes:
judging whether the state of charge of the energy storage system is greater than the lowest state of charge;
if the charge state is larger than the lowest charge state of the energy storage system, the energy storage system is adopted to charge the electric automobile;
if the charging power is less than or equal to the lowest charge state of the energy storage system, sequentially controlling the charging power of the electric automobile to be reduced according to a preset priority, wherein the charging power comprises the charging power of the charging pile to the electric automobile.
In one embodiment, the charging power of the electric automobile is divided into a first gear to a D gear, the charging power corresponding to the first gear to the D gear is increased progressively, wherein D is an integer greater than 1;
the electric automobiles comprise a first type of electric automobile and a second type of electric automobile, the priority of the second type of electric automobile is higher than that of the first type of electric automobile, wherein the charge states of the electric automobile batteries connected to the direct current charging pile are sorted from small to small, the first 30% of the electric automobiles with the charge states of the batteries smaller than 0.3 are the first type of electric automobiles, and the rest of the electric automobiles are the second type of electric automobiles;
if the charging power is less than the lowest charge state of the energy storage system, sequentially controlling the charging power of the electric automobile to be reduced according to the priority comprises the following steps:
for the electric automobiles with actual charging power larger than that of a D-1 gear in the second type of electric automobiles, performing downshift operation on charging power gears of the electric automobiles in sequence according to a preset priority order so as to reduce the charging power of the electric automobiles;
gradually judging whether the load factor theoretical value of the distribution transformer is smaller than a preset value after the downshift operation;
if yes, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, sequentially performing downshift operation on the charging power gears of the electric automobiles with the actual charging power larger than that of the D-1 gear in the first type of electric automobiles according to a preset priority order;
gradually judging whether the load factor theoretical value of the distribution transformer is smaller than a preset value after downshift;
if yes, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, outputting a charging power control instruction corresponding to each electric automobile and finishing power allocation.
In one embodiment, the preset priorities include: the charging time of the access charging pile is shorter the priority of the electric automobile is higher than the charging time of the access charging pile is longer the priority of the electric automobile.
In one embodiment, the receiving the demand response request signal further includes:
judging whether a fault signal exists or not;
if yes, judging the type of the fault signal, and classifying the fault event.
In one embodiment, the determining the type of the fault signal and classifying the fault event includes:
judging whether the charging pile is in fault, if so, not participating in demand response;
otherwise, judging the fault of a current transformer or a voltage transformer in a distribution transformer of the charging station;
when at least one of the faults is failed, the free charging is recovered;
otherwise, judging whether the charging station has a fault or not;
if so, then the free charge is resumed.
According to the charging station power allocation method suitable for demand response, the demand response request signal of the power grid side is received, the participation demand response quantity of the charging station is detected according to the demand response request signal, the load increasing algorithm and the load decreasing algorithm are executed according to the demand response request signal, and the charging power control command is output to the energy storage system and the charging pile, so that the energy storage system and the charging pile can respond to the demand event of the power grid side, the peak clipping and valley filling of the power grid are achieved, meanwhile, the operation cost of the charging station can be reduced, and the distribution network scheduling flexibility is improved.
Drawings
FIG. 1 is a flow diagram illustrating a charging station power allocation method for demand response according to one embodiment;
FIG. 2 is a schematic flow diagram of a load shedding algorithm in one embodiment;
FIG. 3 is a schematic flow chart of steps in a load shedding algorithm in an exemplary embodiment;
FIG. 4 is a schematic flow chart of a load shedding algorithm in another embodiment;
FIG. 5 is a flow diagram illustrating steps in a load shedding algorithm in an exemplary embodiment;
FIG. 6 is a block diagram of a charging station power scheduling apparatus according to one embodiment;
FIG. 7 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
As shown in fig. 1, an embodiment of the present application provides a charging station power allocation method suitable for demand response, which is applied to a charging station side. The charging station includes energy storage system and a plurality of electric pile that fills for electric automobile charges. The method comprises the following steps:
step 102, a demand response request signal is received.
The Demand Response request signal is Demand Response information sent by an Automatic Demand Response Server (ADRS) on the power grid side when the price of the power market increases or the reliability of the system is threatened, and generally includes an increase power signal and a decrease power signal. Specifically, a Demand Response Controller (DRC) installed on the charging station side communicates with the ADRS and receives a demand response request signal transmitted by the ADRS.
And 104, detecting the participation demand response quantity of the charging station according to the demand response request signal.
Specifically, before step S104, the DRC determines whether the demand response event of the power system can be participated in according to the condition in the charging station, for example, the DRC can collect the State of Charge (SOC) of the energy storage system in the charging station, the number of the accessed electric vehicles, the access time of the electric vehicles, and the like to determine whether the demand response event can be participated in, and if the allocable power margin in the charging station is not enough and the demand response cannot be participated in, the DRC communicates with the ADRS and informs that the ADRS cannot participate in. If the distributable power margin in the charging station is enough, the DRC calculates the distributable power, namely the participation demand response quantity, according to the SOC of the energy storage system, the number of the accessed electric vehicles and the access time of the electric vehicles.
And 106, executing a demand response algorithm according to the demand response request signal and the participation demand response quantity of the charging station, wherein the demand response algorithm comprises a load increasing algorithm and a load decreasing algorithm.
Specifically, the demand response request signal includes an increase power signal and a decrease power signal. When the power grid side needs the charging station side to increase the electric quantity, the DRC executes a load increasing algorithm according to the participation demand response quantity of the charging station, and when the power grid side needs the charging station side to reduce the electric quantity, the DRC executes a load reducing algorithm according to the participation demand response quantity of the charging station.
And step 108, outputting a charging power control command to the energy storage system and the charging pile according to a demand response algorithm.
Specifically, the load increasing algorithm and the load reducing algorithm can both output a charging power control instruction to each charging pile and the energy storage system, the charging power control instruction comprises charging time and a power value, and the power value is issued in a percentage manner.
According to the charging station power allocation method suitable for demand response, the demand response request signal of the power grid side is received, the participation demand response quantity of the charging station is detected according to the demand response request signal, the load increasing algorithm and the load decreasing algorithm are executed according to the demand response request signal, and the charging power control command is output to the energy storage system and the charging pile, so that the energy storage system and the charging pile can respond to the demand event of the power grid side, the peak clipping and valley filling of the power grid are achieved, meanwhile, the operation cost of the charging station can be reduced, and the distribution network scheduling flexibility is improved.
In one embodiment, the demand response request signal includes an increase power signal, i.e., an increase in the amount of power drawn by the charging station from the power grid, at which point the DRC executes the load increase algorithm. As shown in fig. 2, the load increase algorithm includes:
step 202, collecting state data of the electric automobile.
The state data of the electric automobile comprises the charging pile type of the electric automobile, the charging time T of the electric automobile and the current actual charging power P of the electric automobile. The charging pile comprises a direct current charging pile and an alternating current charging pile.
And 204, sequentially controlling the charging power of the automobile to be increased according to the preset priority and the state data of the electric automobile, and gradually judging whether the increased electric quantity after the charging power is increased meets the participation demand response quantity.
In the load increase algorithm, the priority for increasing the charging power of the electric vehicle is specified as follows: the electric automobile connected with the direct current charging pile is superior to the electric automobile connected with the alternating current charging pile; the electric automobile with the longer charging time T connected into the charging pile is superior to the electric automobile with the shorter charging time T connected into the charging pile.
The charging power of the electric automobile can be divided into a plurality of gears, the charging gears of the electric automobile are controlled to be gradually lifted according to preset priority, and whether the increased electric quantity of the charging station reaches the participation demand response quantity or not after once lifting is judged every time, if not, the charging gears of the electric automobile at the next time are lifted according to the priority order until the increased electric quantity of the charging station reaches the participation demand response quantity after lifting.
In one embodiment, the charging power of the electric vehicle is divided into a first gear to a D gear, and the charging power corresponding to the first gear to the D gear increases progressively, where D is an integer greater than 1, as shown in fig. 3, step 204 includes:
step 240: sequentially carrying out upshifting operation on the charging power gears of the electric automobile according to a preset priority order on the electric automobile which is connected to the direct current charging pile and has the actual charging power less than or equal to a first gear so as to improve the charging power of the electric automobile;
step 241: gradually judging whether the adjusted increased electric quantity of the charging station meets the participation demand response quantity;
step 242: if yes, outputting a charging power control instruction corresponding to each electric automobile;
step 243: otherwise, accessing the electric automobile with the AC charging pile and the actual charging power less than or equal to the first gear, and sequentially performing upshifting operation on the charging power gears of the electric automobile according to a preset priority order so as to improve the charging power of the electric automobile;
step 244: gradually judging whether the increased electric quantity of the charging station after adjustment meets the participation demand response quantity;
step 245: if yes, outputting a charging power control instruction corresponding to each electric automobile;
step 246: otherwise, the energy storage system responds to the residual capacity of the charging station participating in the demand response.
Specifically, the present embodiment is described by taking the example that the charging power gear has the 3 rd gear, that is, the charging power corresponding to the first gear to the third gear is gradually increased.
Sorting electric vehicles which are connected with a direct current charging pile and have actual charging power less than or equal to a first level according to a preset priority, wherein the preset priority is that the electric vehicle which is connected with the charging pile and has longer charging time T is superior to the electric vehicle which is connected with the charging pile and has shorter charging time T, namely, the vehicles which are connected with the direct current charging pile and have actual charging power lower than the first level are sorted according to the sequence of charging time T of the connected charging piles from large to small and numbered as 1, 2, … … and n 1; firstly, correcting the charging power gear of the No. 1 electric automobile into a second gear; calculating an increased electric quantity by adopting the second gear power value, judging whether the increased electric quantity meets the participation demand response quantity, and if so, outputting a charging power control instruction corresponding to each electric automobile; if not, sequentially adjusting the charging power gears of No. 2 to No. n1 electric vehicles to a second gear and gradually judging whether the adjusted increased electric quantity meets the participation demand response quantity; if so, outputting a charging power control instruction corresponding to each electric automobile; if not, executing a gear-up operation on a vehicle which is connected with the alternating current charging pile and has the actual charging power less than or equal to the first gear according to a preset priority, and gradually judging whether the adjusted increased electric quantity meets the participation demand response quantity; and if so, outputting a charging power control command corresponding to each electric automobile. If the operation is finished, the participation demand response quantity still cannot be met, the next round of gear-up operation is carried out, firstly, the charging power of the electric automobile connected with the direct current charging pile is increased from the second gear to the third gear according to the preset priority, whether the increased electric quantity meets the participation demand response quantity or not is judged gradually, if the increased electric quantity does not meet the participation demand response quantity, the charging power of the electric automobile connected with the alternating current charging pile is increased from the second gear to the third gear according to the preset priority, whether the increased electric quantity meets the participation demand response quantity or not is judged gradually, if the increased electric quantity meets the participation demand response quantity, a charging power control instruction corresponding to each electric automobile is output, if the increased electric quantity does not meet the participation demand response quantity, the energy storage system is utilized to bear the residual electric quantity, and the residual electric.
According to the charging station power allocation method suitable for demand response, the charging power of the electric vehicle is allocated according to the priority by adopting the load increasing algorithm until the adjusted increased electric quantity meets the participation demand response quantity of the charging station, so that the capacity of the charging station participating in power grid demand response can be improved, and the flexibility of distribution network scheduling is improved.
In one embodiment, when the demand response request signal includes a decrease charge signal, i.e., the amount of charge the charging station draws from the power grid is decreased, the DRC executes a load shedding algorithm. As shown in fig. 4, the load shedding algorithm includes:
step 302: and collecting the state data of the electric automobile.
The state data of the electric automobile comprises the type of a charging pile accessed by the electric automobile, the charging time T of the charging pile accessed by the electric automobile, the actual charging power P of the electric automobile and the state of charge SOC of a battery of the electric automobile. The types of the charging piles comprise direct current charging piles and alternating current charging piles.
Step 304: and sequentially controlling the reduction of the charging power of the electric automobile according to the preset priority and the state data of the electric automobile, and gradually judging whether the load rate of a distribution transformer of the charging station meets the preset requirement after the charging power is reduced.
Before this step, also include: judging whether the SOC of the energy storage system is larger than the lowest SOC, wherein the lowest SOC can be 0.2SOCN，SOCNIf the SOC of the energy storage system is more than 0.2SOC for the rated capacity of the energy storage systemNAnd then can be supplied power for electric automobile by energy storage system, need not to adopt and fill electric pile to charge, and then can reduce and fill the electric quantity that electric pile absorbs from the electric wire netting side. If the SOC of the energy storage system is less than or equal to 0.2SOCNThen step 304 is performed.
In the load shedding algorithm, the priority for reducing the charging power of the electric vehicle is defined as follows: the electric automobile connected with the alternating current charging pile is superior to the electric automobile connected with the direct current charging pile; the electric automobile with the short charging time T connected into the charging pile is better than the electric automobile with the long charging time T connected into the charging pile; the second type of electric automobile is prior to the first type of electric automobile, wherein the classification rule of the first type of electric automobile is as follows: and sequencing the SOC of the electric vehicles connected to the direct current charging pile from small to large, wherein the first 30% of the vehicles with the SOC less than 0.3 are first-class electric vehicles, the rest of the electric vehicles are second-class electric vehicles, and the second-class electric vehicles comprise the electric vehicles connected to the alternating current charging pile and the vehicles connected to the direct current charging pile, the last 70% of the vehicles and the SOC more than or equal to 0.3.
The charging power of the electric automobile can be divided into a plurality of gears, the charging gears of the electric automobile are controlled to be gradually reduced according to preset priority, and whether the load rate of a distribution transformer of the charging station meets preset requirements after the charging is reduced once is judged every time the charging gears are reduced once, if the load rate of the distribution transformer of the charging station does not meet the preset requirements, the charging gears of the electric automobile are reduced next time according to the priority order until the load rate of the distribution transformer of the charging station meets the preset requirements. In this embodiment, the requirement is satisfied when the theoretical value of the load factor of the distribution transformer is less than 80%.
In one embodiment, the charging power of the electric vehicle is divided into a first gear to a D-th gear, and the charging power of the first gear to the D-th gear increases progressively, where D is an integer greater than 1, as shown in fig. 5, step 304 includes:
step 340: for the electric automobiles with actual charging power larger than that of a D-1 gear in a second type of electric automobiles, performing downshift operation on charging power gears of the electric automobiles in sequence according to a preset priority order so as to reduce the charging power of the electric automobiles;
step 341: gradually judging whether the load factor theoretical value of a distribution transformer of the charging station after the downshift operation is smaller than a preset value;
step 342: if yes, outputting a charging power control instruction corresponding to each electric automobile;
step 343: otherwise, sequentially performing downshift operation on the charging power gears of the electric automobiles with the actual charging power larger than that of the D-1 gear in the first type of electric automobiles according to a preset priority order;
step 344: gradually judging whether the load factor theoretical value of the distribution transformer after the downshift is smaller than a preset value;
step 345: if yes, outputting a charging power control instruction corresponding to each electric automobile;
step 346: otherwise, outputting a charging power control instruction corresponding to each electric automobile and finishing the allocation.
Specifically, the present embodiment is described by taking the example that the charging power gear has the 3 rd gear, that is, the charging power corresponding to the first gear to the third gear is gradually increased.
Sequencing vehicles with actual charging power P larger than 2 nd-gear charging power in the second type of electric vehicles according to the sequence from small to large of an actual charging power table, and numbering the vehicles as 1, 2, … … and n2, wherein if the actual charging power P is equal, the electric vehicles with larger charging time T connected to the alternating current charging pile are numbered less; correcting the charging power gear of the n4 th electric vehicle into the 2 nd gear, calculating whether the load factor theoretical value of the distribution transformer after downshift is less than 80%, and if so, outputting a charging power control instruction of each electric vehicle to the corresponding charging pile; if not, charging power gears from the n 2-1 electric vehicle to the 1 st electric vehicle are sequentially corrected to the 2 nd gear, whether the load rate theoretical value of the distribution transformer after downshift is less than 80% is successively judged, if yes, a charging power control command corresponding to each electric vehicle is output to the corresponding charging pile, and if not, downshift operation is performed on the electric vehicles with the actual charging power P being greater than the 1 st gear power value in the second type of electric vehicles according to the preset priority. If the load rate theoretical value of the distribution transformer of the charging station is still larger than 80% after all the second vehicles complete the downshift operation, the first type of electric vehicles are sorted according to the preset priority, the charging power gears of the first type of electric vehicles are sequentially reduced according to the priority sorting until the load rate theoretical value of the distribution transformer is smaller than 80% or the charging station has no allocable resource, and then the power allocation is finished.
According to the charging station power allocation method suitable for demand response, the load reduction algorithm is adopted according to the received electric quantity reduction signal, and the charging power of the electric vehicle is allocated according to the preset priority level until the load rate theoretical value of the distribution transformer of the charging station is smaller than the preset value after adjustment, so that the capacity of the charging station participating in power grid demand response can be improved, and the flexibility of distribution network scheduling is improved.
In one embodiment, the DRC also determines whether a fault signal is present after receiving a corresponding demand request signal. If no fault signal exists, performing power allocation, and if a fault signal exists, judging the fault type by DRC. When communication faults exist between the DRC and the ADRS on the power grid side, the DRC does not carry out power allocation, namely does not participate in a demand response event; when the DRC judges that a voltage transformer and a current transformer in the distribution transformer have faults, and when at least one of the voltage transformer and the current transformer has faults or when the DRC judges that the current transformer has faults, the DRC controls the charging pile to recover free charging without participating in a demand response event; and if the DRC judges the communication fault between the DRC and the charging pile, the DRC does not carry out power allocation after receiving the demand response request signal.
And when the DRC judges the type of the fault signal, sending the fault event to an ADRS on the power grid side, and not performing power allocation.
It should be understood that at least some of the steps in fig. 1-5 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
In one embodiment, as shown in fig. 6, there is provided a charging station power allocating apparatus adapted for demand response, including: the device comprises a receiving module, a calculating module, an algorithm executing module and an instruction output module, wherein:
a receiving module 610, configured to receive a demand response request signal sent by a grid side ADRC;
the calculating module 620 is used for calculating the participation demand response quantity of the charging station according to the demand response request signal;
the algorithm executing module 630 is configured to execute a demand response algorithm according to the demand response request signal and the participation demand response amount of the charging station, where the demand response algorithm includes a load increasing algorithm and a load decreasing algorithm;
and the instruction output module 640 is used for outputting a charging power control instruction to the energy storage system and the charging pile according to a demand response algorithm.
In one embodiment, the algorithm execution module 630 includes an acquisition unit, a load increase algorithm unit and a load decrease algorithm unit connected to the acquisition unit. The collecting unit is used for collecting state data of the electric automobile, the load increasing algorithm unit is used for executing a load increasing algorithm according to the state data of the electric automobile when the demand response request signal is the electric quantity increasing signal, and the load reducing algorithm unit is used for executing a load reducing algorithm according to the state data of the electric automobile when the demand response request signal is the electric quantity reducing signal.
In one embodiment, the algorithm execution module 430 further includes a shift unit and a priority unit, both of which are connected to the load increase algorithm unit and the load decrease algorithm unit. The gear unit prestores a plurality of gears of charging power, namely a first gear to a D gear, the charging power corresponding to the first gear to the D gear is increased progressively, and the priority unit is connected with the acquisition unit and used for carrying out priority sequencing on the electric automobile according to the state data of the electric automobile. And the load increasing algorithm unit and the load reducing algorithm unit respectively execute a load increasing algorithm and a load reducing algorithm according to the data of the gear unit and the priority unit.
For specific limitations of the charging station power allocation device, reference may be made to the above limitations of the charging station allocation method, which are not described herein again. The various modules in the charging station allocation apparatus described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing state data, charging power gear data, priority rules and the like of the electric automobile. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a charging station power scheduling method suitable for demand response.
Those skilled in the art will appreciate that the architecture shown in fig. 7 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
receiving a demand response request signal;
calculating participation demand response quantity of the charging station according to the demand response request signal;
executing a demand response algorithm according to the demand response request signal and the participation demand response quantity of the charging station, wherein the demand response algorithm comprises a load increasing algorithm and a load decreasing algorithm;
and outputting a charging power control command to the energy storage system and the charging pile according to a demand response algorithm.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
integrating the type of a charging pile accessed by the electric automobile, the charging time of the accessed charging pile of the electric automobile and the actual charging power of the electric automobile;
sequentially carrying out upshifting operation on charging power gears of the electric automobile according to a preset priority order on the electric automobile which is connected to the direct current charging pile and has actual charging power less than or equal to a first gear so as to improve the charging power of the electric automobile;
gradually judging whether the increased electric quantity of the adjusted charging station meets the participation demand response quantity;
if so, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, sequentially performing upshifting operation on the charging power gears of the electric automobile according to a preset priority order on the electric automobile which is connected with the alternating current charging pile and has the actual charging power less than or equal to a first gear so as to improve the charging power of the electric automobile;
gradually judging whether the increased electric quantity of the adjusted charging station meets the participation demand response quantity;
if so, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, the energy storage system is adopted to provide the residual electric quantity for the electric automobile.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
the method comprises the following steps of collecting the type of a charging pile accessed by an electric automobile, the charging time of the electric automobile accessed to the charging pile, the actual charging power of the electric automobile and the charge state of a battery of the electric automobile;
judging whether the state of charge of the energy storage system is greater than the lowest state of charge;
if the charge state is larger than the lowest charge state of the energy storage system, the energy storage system is adopted to charge the electric automobile;
if the actual charging power of the electric automobiles in the second class is less than or equal to the lowest charging state of the energy storage system, sequentially performing downshift operation on charging power gears of the electric automobiles according to a preset priority order so as to reduce the charging power of the electric automobiles;
gradually judging whether the load factor theoretical value of the distribution transformer is smaller than a preset value after the downshift operation;
if so, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, sequentially performing downshift operation on the charging power gears of the electric automobiles in the first class of electric automobiles according to a preset priority order, wherein the actual charging power of the electric automobiles is greater than that of the D-1 gear;
gradually judging whether the load factor theoretical value of the distribution transformer after the downshift is smaller than a preset value;
if so, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, outputting a charging power control instruction corresponding to each electric automobile and finishing power allocation.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A charging station power allocation method suitable for demand response is characterized in that the charging station comprises an energy storage system and a plurality of charging piles, the charging piles and the energy storage system are used for charging electric vehicles, and the method comprises the following steps:
receiving a demand response request signal;
calculating participation demand response quantity of the charging station according to the demand response request signal;
executing a demand response algorithm according to the demand response request signal and the participation demand response quantity of the charging station, wherein the demand response algorithm comprises a load increasing algorithm and a load reducing algorithm;
and outputting a charging power control command to the energy storage system and the charging pile according to the demand response algorithm.
2. The method of claim 1, wherein the executing a demand response algorithm based on the demand response request signal and the charge station's participation demand response quantity comprises:
when the demand response request signal is an electric quantity increasing signal, executing the load increasing algorithm;
the load increasing algorithm comprises the following steps:
acquiring state data of the electric automobile, wherein the state data of the electric automobile comprises the type of a charging pile accessed by the electric automobile, the charging time of the charging pile accessed by the electric automobile and the actual charging power of the electric automobile;
and sequentially controlling the charging power of the electric automobile to be increased according to a preset priority and the state data of the electric automobile, and gradually judging whether the increased electric quantity after the charging power is increased meets the participation demand response quantity.
3. The method according to claim 2, wherein the charging power of the electric vehicle is divided into a first gear to a D gear, the charging power of the first gear to the D gear is increased progressively, wherein D is an integer greater than 1;
sequentially controlling the charging power of the electric automobile to be increased according to a preset priority and the state data of the electric automobile, and gradually judging whether the increased electric quantity after the charging power is increased meets the participation demand response quantity comprises the following steps:
sequentially carrying out upshifting operation on the charging power gears of the electric automobile according to a preset priority order on the electric automobile which is connected into the direct current charging pile and has the actual charging power less than or equal to a first gear so as to improve the charging power of the electric automobile;
gradually judging whether the increased electric quantity of the charging station after adjustment meets the participation demand response quantity;
if yes, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, sequentially performing up-shifting operation on the charging power gears of the electric automobile according to a preset priority order on the electric automobile which is connected to the alternating current charging pile and has the actual charging power less than or equal to a first gear so as to improve the charging power of the electric automobile;
gradually judging whether the increased electric quantity of the charging station after adjustment meets the participation demand response quantity;
if yes, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, responding the residual electric quantity of the charging station participating in the demand response by the energy storage system.
4. The method of claim 3, wherein the pre-set priorities comprise: the charging time of the access charging pile is longer, the priority of the electric automobile is higher than the priority of the electric automobile, the charging time of the access charging pile is shorter, and the priority of the electric automobile is higher than the priority of the access charging pile.
5. The method of claim 1, wherein the executing a demand response algorithm based on the demand response request signal and the charge station's participation demand response quantity comprises:
executing the load shedding algorithm when the demand response request signal includes a reduced charge signal;
the load shedding algorithm comprises:
acquiring state data of the electric automobile, wherein the state data of the electric automobile comprises the type of a charging pile accessed by the electric automobile, the charging time of the charging pile accessed by the electric automobile, the actual charging power of the electric automobile and the charge state of a battery of the electric automobile;
and sequentially controlling the reduction of the charging power of the electric automobile according to the preset priority and the state data of the electric automobile, and gradually judging whether the load rate of a distribution transformer of the charging station meets the preset requirement after the charging power is reduced.
6. The method of claim 5, wherein sequentially controlling the charging power of the electric vehicles to be reduced according to a preset priority, and sequentially determining whether the load factor of the distribution transformer of the charging station after the charging power is reduced meets a preset requirement comprises:
judging whether the state of charge of the energy storage system is greater than the lowest state of charge;
if the charge state is larger than the lowest charge state of the energy storage system, the energy storage system is adopted to charge the electric automobile;
if the charging power is less than or equal to the lowest charge state of the energy storage system, sequentially controlling the charging power of the electric automobile to be reduced according to a preset priority, wherein the charging power comprises the charging power of the charging pile to the electric automobile.
7. The method according to claim 6, wherein the charging power of the electric vehicle is divided into a first gear to a D gear, the charging power of the first gear to the D gear is increased progressively, wherein D is an integer greater than 1;
the electric automobiles comprise a first type of electric automobile and a second type of electric automobile, the priority of the second type of electric automobile is higher than that of the first type of electric automobile, wherein the charge states of the electric automobile batteries connected to the direct current charging pile are sorted from small to small, the first 30% of the electric automobiles with the charge states of the batteries smaller than 0.3 are the first type of electric automobiles, and the rest of the electric automobiles are the second type of electric automobiles;
if the charging power is less than the lowest charge state of the energy storage system, sequentially controlling the charging power of the electric automobile to be reduced according to the priority comprises the following steps:
for the electric automobiles with actual charging power larger than that of a D-1 gear in the second type of electric automobiles, performing downshift operation on charging power gears of the electric automobiles in sequence according to a preset priority order so as to reduce the charging power of the electric automobiles;
gradually judging whether the load factor theoretical value of the distribution transformer is smaller than a preset value after the downshift operation;
if yes, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, sequentially performing downshift operation on the charging power gears of the electric automobiles with the actual charging power larger than that of the D-1 gear in the first type of electric automobiles according to a preset priority order;
gradually judging whether the load factor theoretical value of the distribution transformer is smaller than a preset value after downshift;
if yes, outputting a charging power control instruction corresponding to each electric automobile;
otherwise, outputting a charging power control instruction corresponding to each electric automobile and finishing power allocation.
8. The method of claim 7, wherein the pre-set priorities comprise: the charging time of the access charging pile is shorter the priority of the electric automobile is higher than the charging time of the access charging pile is longer the priority of the electric automobile.
9. The method of claim 1, wherein receiving the demand response request signal further comprises:
judging whether a fault signal exists or not;
if yes, judging the type of the fault signal, and classifying the fault event.
10. The method of claim 9, wherein said determining the type of the fault signal and classifying the fault event comprises:
judging whether the charging pile is in fault, if so, not participating in demand response;
otherwise, judging the fault of a current transformer or a voltage transformer in a distribution transformer of the charging station;
when at least one of the faults is failed, the free charging is recovered;
otherwise, judging whether the charging station has a fault or not;
if so, then the free charge is resumed.
CN202010376129.8A 2020-05-07 2020-05-07 Charging station power allocation method suitable for demand response Active CN111490576B (en)

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