CN115603328A - Charging control method of charging equipment - Google Patents
Charging control method of charging equipment Download PDFInfo
- Publication number
- CN115603328A CN115603328A CN202211376130.6A CN202211376130A CN115603328A CN 115603328 A CN115603328 A CN 115603328A CN 202211376130 A CN202211376130 A CN 202211376130A CN 115603328 A CN115603328 A CN 115603328A
- Authority
- CN
- China
- Prior art keywords
- charging
- power
- real
- time
- equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/004—Generation forecast, e.g. methods or systems for forecasting future energy generation
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0075—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a charging control method of charging equipment, which relates to the field of charging control of charging stations, and is characterized in that the upper limit of the charging power of all the charging equipment in an operation period is calculated by combining the maximum power generation power, the maximum energy storage and discharge power and the maximum available active power of a power grid; when more charging devices are operated and the total power of the operating charging devices exceeds the upper limit of the charging power, the real-time charging power of each charging device needs to be reduced, so that the situation that a large number of charging devices simultaneously rush into a power grid to cause impact on the stability of the power grid is avoided; in addition, when the real-time charging power is reduced, the required charging time is prolonged, the real-time charging power and the expected charging time in the operation period are fed back to a client, and the client can adjust the time period for using the charging equipment under the influence of the real-time charging power and the charging time, so that the user is inhibited from using the charging equipment in the peak period, and the safe and stable operation of a power grid is ensured.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a charging control method of charging equipment.
Background
With the strategic development of energy and the implementation of low-carbon action in China, electric vehicles are gradually and widely applied, and the application of the electric vehicles greatly meets the requirements of the current society on environmental awareness and effectively saves the consumption of fossil fuels.
Due to the advantages of pollution-free emission of electric vehicles and the attention of government departments, electric vehicles will become important transportation tools for future trips. However, when a large number of electric vehicles are randomly connected to a power grid as a load to be charged, a small impact may be caused to the power grid, which seriously affects the power quality of the power grid and a charging station, and sometimes even affects the safe and stable operation of the power grid.
Disclosure of Invention
The invention aims to solve the problem of how to control the use of the charging equipment, and avoid the simultaneous inrush of a large number of charging equipment into a power grid so as to ensure the safe and stable operation of the power grid.
In order to solve the above problem, in one aspect, the present invention provides a charging control method for a charging device, including:
in an operation period, analyzing the upper limit of charging power output by a charging station in the operation period according to the maximum power generation power, the maximum energy storage and discharge power and the maximum active power available by a power grid;
adjusting the real-time charging power of the charging equipment based on the upper limit of the charging power and the service condition of the charging equipment;
and sending the real-time charging power to a user, and guiding the user to use the charging equipment for charging.
Further, before the analyzing the upper limit of the charging power output by the charging station in the operation cycle, the charging control method of the charging device further includes:
modeling the charging station into a comprehensive load model based on structural data of the charging station, wherein the comprehensive load model comprises a constant current sub-model, a constant voltage sub-model and a constant power sub-model;
periodically analyzing the maximum active power available from the distribution network to the power grid through which the connection between the integrated load model may pass.
Further, the periodically analyzing the maximum active power available to the power grid through which the connection between the power distribution grid and the integrated load model may pass includes:
gradually increasing the active power of the comprehensive load model in a specified step length in the operation period;
performing a load flow analysis or/and a stability analysis on the integrated load model;
when the power flow analysis or/and stability analysis outputs a critical instability result, the critical instability of the running state of the comprehensive load model is judged, the active power output by the comprehensive load model before the critical instability is recorded as the maximum active power available for the power grid, wherein the critical instability result comprises thermal stability critical out-of-limit or critical overload, transient voltage critical instability, frequency instability or power angle critical instability.
Further, the charging control method of the charging device further includes:
calculating the limit number of the charging equipment capable of operating in the operating period according to the upper limit of the charging power which can be output by the charging station and the upper limit of the charging power of the single charging equipment;
and guiding the charging behavior of the user according to the limit number and the number of the charging devices in operation in the operation period.
Further, the calculating the limit number of the charging devices capable of operating in the operating period according to the upper limit of the charging power capable of being output by the charging station in the operating period and the upper limit of the charging power of a single charging device includes:
and dividing the upper limit of the charging power output by the charging station in the operation period by the upper limit of the charging power of a single charging device, and turning the calculation result downwards to obtain the limit number of the charging devices capable of operating in the operation period.
Further, the adjusting the real-time charging power of the charging device based on the upper charging power limit and the usage of the charging device includes:
when the sum of the real-time charging powers of all the charging devices is smaller than or equal to the charging power upper limit of all the current charging devices, maintaining that the sum of the real-time charging powers of all the current charging devices is smaller than or equal to the charging power upper limit of all the current charging devices, and increasing or decreasing the real-time charging power of the related charging devices in real time according to the demand information fed back by the user;
when the sum of the real-time charging powers of all the charging devices is larger than the charging power upper limit of all the charging devices at present, analyzing the overrun power exceeding the charging power upper limit of all the charging devices at present, and proportionally regulating the real-time charging power of each charging device according to the overrun power;
further, after the real-time charging power of each charging device is adjusted down proportionally according to the overrun power, the charging control method of the charging device further includes:
and if the real-time charging power of the charging equipment is smaller than zero after the charging equipment is adjusted downwards, enabling the real-time charging power of the charging equipment with the real-time charging power smaller than zero to return to zero, and averagely distributing the overrun power distributed to the charging equipment with the real-time charging power returned to zero to other running charging equipment.
Further, the charging power upper limits of all the charging devices are calculated according to the current generating power of the generating device, the energy storage and discharge maximum power in the operating period, and the maximum active power available to the power grid in the operating period.
Further, the sending the real-time charging power to a user, and guiding the user to charge using a charging device includes:
adjusting charging electricity price according to the real-time charging power of the charging equipment;
and sending the charging electricity price and the real-time charging power to a user, and guiding the user to use a charging device for charging.
Further, the adjusting the charging price according to the real-time charging power of the charging device comprises:
and calculating the current charging power price of each charging device according to the charging base power price and the current real-time charging power of each charging device, wherein the charging power price is linearly related to the current real-time charging power.
Compared with the prior art, the invention has the following beneficial effects:
according to the charging control method for the charging equipment, provided by the invention, the maximum power generation power, the maximum energy storage and discharge power and the maximum active power available for a power grid are combined, and the upper limit of the charging power of all the charging equipment in an operation period is calculated; when more charging devices are operated and the total power of the operating charging devices exceeds the upper limit of the charging power, the real-time charging power of each charging device needs to be reduced, so that the impact of the simultaneous inrush of a large number of charging devices into the power grid on the stability of the power grid is avoided; in addition, when the real-time charging power is reduced, the required charging time is increased, the real-time charging power and the expected charging time in the operation period are fed back to the customer, and the customer is influenced by the real-time charging power and the expected charging time, so that the time period for using the charging equipment is adjusted, for example, when the charging equipment reaches the peak use, the charging time is increased, and therefore the use of the charging equipment by the user in the peak period is restrained. Therefore, the real-time charging power of the charging equipment is dynamically adjusted based on the service condition of the charging equipment, and a user is guided to select whether to charge in the current operation period, so that the safe and stable operation of the power grid is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a flowchart of a charging control method of a charging device in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a flowchart of a charging control method of a charging device in an embodiment of the present invention, where the charging control method of the charging device includes:
step 100: and in the operation period, analyzing the upper limit of the charging power which can be output by the charging station in the operation period according to the maximum power generation power, the maximum energy storage and discharge power and the maximum active power which can be supplied by the power grid. Adding the maximum power generation power, the maximum energy storage discharge power and the maximum active power available for the power grid to obtain the upper limit of the charging power which can be output by the charging station for supporting the operation of the charging equipment in the operation period. The upper limit of the charging power refers to the maximum output power of the charging station, which can support the normal operation of the charging equipment and does not influence the stability of the power grid.
Step 200: and adjusting the real-time charging power of the charging equipment based on the upper limit of the charging power and the service condition of the charging equipment. The operation cycle refers to that the charging control method of the charging device is executed periodically, for example, with 15min as one cycle, the operation conditions of the charging station and the charging device are sampled and controlled once, based on the operation conditions of the current operation cycle, how much real-time charging power the charging device will work in the next cycle is controlled, and the charging electricity price of the next cycle is adjusted.
Step 300: and sending the real-time charging power to a user, and guiding the user to use a charging device for charging.
Specifically, for the ordered charging research of the electric vehicle, the existing scheme is mostly solved by an optimization method, and on the premise of determining an optimization target and constraint conditions, the existing scheme can be solved by methods including a genetic algorithm, a differential evolution algorithm and the like, but a solution thought based on an artificial intelligence method does not have a clear physical mechanism. The physical mechanism refers to carrying out optimization solution according to a certain physical rule, and a clear incidence relation exists between the solved input characteristics and the solved conclusion. The solution method based on artificial intelligence can be considered as trial and error according to a certain rule, and the incidence relation between input and output is not clear.
The maximum power generation power refers to the maximum power of electric energy generated by photovoltaic power generation equipment or other renewable energy power generation equipment, and the maximum power of energy storage discharge refers to the maximum power of electric energy generated by energy storage equipment (such as an energy storage battery pack) equipped in a charging station, wherein the power generation equipment can be water conservancy power generation equipment or wind power generation equipment or a combination of multiple power generation equipment besides photovoltaic power generation equipment. In addition, the charging equipment can be charging equipment (such as a charging pile) arranged for an electric automobile, and can also be charging equipment (such as a charging box or a charging system) arranged for an electromobile or an electromobile battery. The same charging stations may be light storage charging stations or wind storage charging stations, etc. In addition, the maximum power generation power is predicted based on historical data, and the maximum energy storage discharge power may be a power value estimated based on the current energy storage of the energy storage device, or may be a power value that can be released when the energy storage device is fully charged. Because the energy storage device can supplement the charging energy while discharging, the discharging speed is generally less than the charging speed, and therefore, the energy storage device can reach a full-charge state at a certain moment.
Based on the charging control method of the charging equipment, calculating the maximum active power which can be supplied by a power grid and can pass through a connecting feeder line from the power distribution network to the charging station in an operation period; calculating the upper limit of the charging power of all charging equipment in the operation period by combining the maximum power generation power and the maximum energy storage and discharge power; with the continuous use of the charging equipment in the charging station, due to the limitation of the upper limit of the charging power, when more charging equipment is operated and the total power of the operating charging equipment exceeds the upper limit of the charging power, the real-time charging power of each charging equipment needs to be reduced, so that the impact on the stability of a power grid caused by the simultaneous inrush of a large number of charging equipment into the power grid is avoided; in addition, when the real-time charging power is low, the same mobile equipment (such as an electric automobile, a battery car and the like) is fully charged, the required charging time is prolonged, the real-time charging power and the predicted charging time in the operation cycle are fed back to the customer, and the customer adjusts the time period for using the charging equipment under the influence of the real-time charging power and the predicted charging time, for example, when the charging equipment reaches the peak use, the charging time is longer, so that the user is inhibited from using the charging equipment in the peak period. Therefore, the real-time charging power of the charging equipment is dynamically adjusted based on the service condition of the charging equipment, and a user is guided to select whether to charge in the current operation period or not, so that the safe and stable operation of the power grid is ensured, and the power quality of the power grid and the charging station is further ensured.
In an embodiment of the present invention, before step 100, the method for controlling charging of a charging device further includes:
and modeling the charging station into a comprehensive load model based on the structural data of the charging station, wherein the comprehensive load model comprises a constant current sub-model, a constant voltage sub-model and a constant power sub-model. Because the equipment is diversified in the charging station, the operation mode of different equipment is different, some equipment is constant current equipment, some equipment is constant voltage equipment, still some equipment is constant power equipment, in order to facilitate the analog computation, according to the occupation ratio of different kinds of equipment in the charging station, model building is respectively carried out to different kinds of equipment, for example, the collection of equipment of different mode is represented respectively to constant current submodel, constant voltage submodel and constant power submodel, the occupation ratio between them can set up to 3:3:4.
periodically analyzing the maximum active power available from the distribution network to the power grid through which the connection between the integrated load model may pass. The charging equipment is connected to the power grid in different time, and some household or commercial equipment is connected to the power grid and rushes into the power grid, and in each operation period, the number of the charging equipment connected to the power grid is changed constantly, so that the maximum available active power of the power grid needs to be updated periodically, the purpose of updating periodically instead of updating in real time is to reduce the calculation amount, and in a certain time period, the change of the power output by the power grid is not too large, so that the data do not need to be updated in real time.
In one embodiment of the present invention, said periodically analyzing the maximum active power available to the grid through which the connection between the distribution grid and the integrated load model may pass comprises:
gradually increasing the active power of the comprehensive load model in a specified step length in the operation period;
performing a load flow analysis or/and a stability analysis on the integrated load model;
and when the critical instability result is output by power flow analysis or/and stability analysis, judging the critical instability of the running state of the comprehensive load model, and recording the active power output by the comprehensive load model before the critical instability as the maximum active power available for the power grid, wherein the critical instability result comprises thermal stability critical out-of-limit or critical overload, transient voltage critical instability, frequency critical instability or power angle critical instability.
Specifically, firstly, based on a network topology in an operation period, the active power of the comprehensive load model is gradually increased by a certain step length, firstly, N-1 power flow analysis is executed to ensure the thermal stability and no overload of each line in the power distribution network, and then, N-1 stability analysis is executed to ensure the stability of transient voltage/frequency/power angle in the power distribution network; the N-1 power flow analysis and the N-1 stability analysis refer to the fact that a connecting line is cut off to conduct power flow and stability analysis. Wherein N-1 refers to an N-1 principle, and the N-1 principle is a criterion for judging the safety of the power system. Also known as single fail-safe criteria. According to the principle, after any independent element (generator, transmission line, transformer, charging equipment and the like) in N elements of the power system is cut off due to a fault, no power failure of a user due to overload tripping of other lines is caused, the stability of the system is not damaged, and accidents such as voltage breakdown and the like do not occur.
Then, once the obtained comprehensive load model enables the N-1 power flow analysis or stability analysis to generate thermal stability out-of-limit/overload/transient voltage/frequency/power angle instability, the active power passing through a connecting feeder line from the power distribution network to the optical storage charging station under the comprehensive load model at the moment or at the previous moment is recorded, and the maximum active power can be supplied to the power grid.
The power flow analysis is to solve the distribution situation of the voltage and branch power of each node of the power network in a certain steady-state normal operation mode of the power system. The stability analysis is divided into static stability analysis and transient stability analysis, wherein the static stability refers to the capability of automatically recovering to an initial running state without spontaneous oscillation and aperiodic step loss after a power system is subjected to small interference; transient stability refers to the ability of each synchronous motor to transition to a new state or recover to obtain an original stable operation state after a power system is subjected to large disturbance.
Based on the photovoltaic prediction information and the energy storage power information in the operation period, calculating the upper limit of the charging power output by the charging station in the operation period as follows:
P ch.max ＝P pv.max +P st.max +P dis.max ；
wherein, P ch.max Represents the upper limit of the charging power of all the charging devices (i.e. the upper limit of the charging power that can be output by the charging station), P, during the operating cycle pv.max Represents the maximum power generated by the generating equipment in the operating period and can be obtained by the ultra-short term prediction of the photovoltaic system, P st.max The maximum power for energy storage and discharge in the operation period can be calculated by every other fixed period based on an economic dispatching operation algorithm, P dis.max And supplying the maximum active power to the power grid in the operation period.
In an embodiment of the present invention, the charging control method of the charging device further includes:
calculating the limit number of the charging equipment capable of operating in the operating period according to the upper limit of the charging power which can be output by the charging station and the upper limit of the charging power of the single charging equipment;
and guiding the charging behavior of the user according to the limit number and the number of the charging devices in operation in the operation period.
For example, comparing the limit number with the number of the charging devices in operation in the operation period, and when the number of the charging devices in operation in the operation period is less than or equal to the limit number, maintaining the real-time charging power of all the current charging devices unchanged; when the number of the charging devices working in the operation period is larger than the limit number, subtracting the charging power upper limit of all the charging devices from the sum of the real-time charging power of all the charging devices to obtain the overrun power exceeding the charging power upper limit of all the charging devices, and adjusting the real-time charging power of each charging device proportionally according to the overrun power. The client is influenced by the real-time charging power, the time period for using the charging equipment can be adjusted, the probability that the user still selects to use the operating equipment in the peak time period of using the operating equipment is reduced, and the charging behavior of the user is guided.
Or when the number of the charging devices in operation in the operation cycle is greater than the limit number, locking the charging devices which are not turned on, for example, changing the state of the charging devices which are not used into a reserved state, a state in which the devices are damaged, or a state in which the charging devices can not be used, such as device maintenance, etc., and not allowing more charging devices to be used, thereby avoiding the impact on the stability of the power grid caused by the simultaneous inrush of a large number of charging devices into the power grid.
In an embodiment of the present invention, the calculating the limit number of the charging devices capable of operating in the operation period according to the upper limit of the charging power that the charging station can output in the operation period and the upper limit of the charging power of the single charging device includes:
and dividing the upper limit of the charging power output by the charging station in the operation period by the upper limit of the charging power of a single charging device, and turning the calculation result downwards to obtain the limit number of the charging devices capable of operating in the operation period.
Specifically, the number of the charging devices is as follows:
wherein, P ch.max Represents an upper limit of charging power output by the charging station during said operating period, P cp.max The upper limit of the charging power of the single charging equipment is calculated according to the maximum charging power of the charging equipment,
the function flag is rounded down.
In an embodiment of the present invention, the adjusting the real-time charging power of the charging device based on the upper charging power limit and the usage condition of the charging device includes:
when the sum of the real-time charging powers of all the charging devices is smaller than or equal to the charging power upper limit of all the current charging devices, the sum of the real-time charging powers of all the current charging devices is maintained to be smaller than or equal to the charging power upper limit of all the current charging devices, the real-time charging powers of the related charging devices are increased or decreased in real time according to demand information fed back by a user, and the user can be guided to select the corresponding charging devices in a fast charging and slow charging alternative sequencing mode.
When the sum of the real-time charging power of all the charging equipment is larger than the charging power upper limit of all the current charging equipment, subtracting the charging power upper limit of all the current charging equipment from the sum of the real-time charging power of all the charging equipment to obtain overrun power exceeding the charging power upper limit of all the current charging equipment, and proportionally regulating the real-time charging power of each charging equipment according to the overrun power; the proportional down-regulation means that the overrun power is averagely distributed to each working charging device according to the number of the current working charging devices, and the overrun power obtained by averagely distributing is subtracted from the real-time charging power of each working charging device.
And if the real-time charging power of the charging equipment is smaller than zero after the charging equipment is adjusted downwards, enabling the real-time charging power of the charging equipment with the real-time charging power smaller than zero to return to zero, and averagely distributing the overrun power distributed to the charging equipment with the real-time charging power returned to zero to other running charging equipment.
In this embodiment, when the sum of the real-time charging powers of the charging devices in the operation cycle is greater than the charging power upper limit of all the charging devices at present, the power exceeding the limit can be distributed to each charging device, the real-time charging power of the charging device is adaptively adjusted, and the real-time charging power of the entire charging device is reduced, so that the influence on each charging device is small, and the extended charging time is controlled within a range acceptable to most users. By the method, when the number of the charging devices is large, the impact of the charging devices rushing into the power grid on the power grid can be relieved. When the charging equipment is reduced, the real-time charging power can be increased appropriately. In addition, in consideration of extreme situations, when the real-time charging power of a certain charging device is reduced to zero or below zero after the real-time charging power is reduced once or continuously, the charging device can be directly disconnected from the charging device row which is not used, and the generated redundant over-limit power is further divided into other charging devices. Assuming that the out-of-limit total power at the current moment is delta P, the charging power of each charging device is adjusted down and is unified to delta P/N at the moment.
And calculating the charging power upper limit of all the charging equipment according to the current generating power of the generating equipment, the energy storage and discharge maximum power in the operating period and the maximum active power available for the power grid in the operating period. The specific calculation formula is as follows:
P ch.max (t)＝P pv (t)+P si.max +P dis.max ；
wherein, P pv (t) represents the generated power of the power generation facility at the present time t, P st.max Discharging maximum power, P, for energy storage during the operating period dis.max For supplying maximum active power to the network during the operating periodAnd (4) rate.
In an embodiment of the present invention, the sending the real-time charging power to the user, and guiding the user to charge using the charging device includes:
adjusting charging electricity price according to the real-time charging power of the charging equipment;
and sending the charging electricity price and the real-time charging power to a user, and guiding the user to use a charging device for charging.
In this embodiment, after the real-time charging power of each charging device is adjusted, the charging price is adjusted accordingly, the charging price and the real-time charging power in the operation cycle are fed back to the customer, and the customer may adjust the time period for using the charging device under the influence of the charging price, for example, when the charging device reaches the peak time, the charging price may be raised, so as to inhibit the user from using the charging device in the peak time. Therefore, based on the service condition of the charging equipment, the charging price of the charging equipment is dynamically adjusted, and a user is guided to select whether to charge in the current operation period or not, so that the safe and stable operation of the power grid is ensured, and the power quality of the power grid and a charging station is further ensured.
In an embodiment of the present invention, the adjusting the charging price according to the real-time charging power of the charging device includes:
and calculating the current charging power price of each charging device according to the charging base power price and the current real-time charging power of each charging device, wherein the charging power price is linearly related to the current real-time charging power. The specific calculation formula is as follows:
pri(i，t)＝p 0 +k·P ch (i)；
where pri (i, t) denotes the charging price of the ith charging device at time t, p 0 For charging base price, k is the proportionality coefficient, P ch And (i, t) is the real-time charging power of the ith charging device at the time t.
In this embodiment, a relationship between the real-time charging power and the charging price of the charging device is further given, wherein the proportionality coefficient k is preferably a positive number, because when the real-time charging power is reduced, the charging price is also reduced correspondingly to compensate for the influence of the reduction of the charging power on the user, and it is ensured that when the same device is charged, even if the charging power and the charging duration are changed, the charging cost is kept unchanged basically. In addition, when the proportionality coefficient k is a negative number, when the real-time charging power is increased, it is indicated that the total power of the charging equipment does not exceed the upper limit of the charging power, more charging equipment is allowed to be inrush, and the charging price is correspondingly reduced at the moment, so that a user is encouraged to use the charging equipment under the condition; when the real-time charging power is reduced, the total power of the charging equipment is indicated to exceed the upper limit of the charging power, more charging equipment is required to be restrained from entering a power grid, the charging price is correspondingly increased, if a user still uses the charging equipment at the moment, the real-time charging power is not high, the charging time is prolonged, and the charging cost is correspondingly increased, so that the user is dissuaded from using the charging equipment under the condition. Meanwhile, the method is based on a physical mechanism, has strict logic and accurate output result, and can achieve refined management and control on the charging equipment.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A charging control method of a charging device, comprising:
in an operation period, analyzing the upper limit of charging power output by a charging station in the operation period according to the maximum power generation power, the maximum energy storage and discharge power and the maximum active power available by a power grid;
adjusting the real-time charging power of the charging equipment based on the upper limit of the charging power and the service condition of the charging equipment;
and sending the real-time charging power to a user, and guiding the user to use the charging equipment for charging.
2. The method of claim 1, further comprising, prior to said analyzing an upper limit of charging power output by the charging station during the operating cycle, the steps of:
modeling the charging station as a comprehensive load model based on the structural data of the charging station, wherein the comprehensive load model comprises a constant current sub-model, a constant voltage sub-model and a constant power sub-model;
periodically analyzing the maximum active power available to the grid through which a connection from the distribution grid to the integrated load model may pass.
3. The method of claim 2, wherein the periodically analyzing the maximum active power available to the power grid through which a connection between the power distribution grid and the integrated load model may pass comprises:
gradually increasing the active power of the comprehensive load model in a specified step length in the operation period;
performing a load flow analysis or/and a stability analysis on the integrated load model;
and when the power flow analysis or/and the stability analysis output critical instability results, judging the critical instability of the comprehensive load, and recording the active power output by the comprehensive load model before the critical instability as the maximum available active power of the power grid, wherein the critical instability results comprise thermal stability critical out-of-limit or critical overload, transient voltage critical instability, frequency critical instability or power angle critical instability.
4. The charging control method of a charging device according to claim 1, characterized by further comprising:
calculating the limit number of the charging equipment capable of operating in the operating period according to the upper limit of the charging power capable of being output by the charging station in the operating period and the upper limit of the charging power of a single charging equipment;
and guiding the charging behavior of the user according to the limit number and the number of the charging devices in work in the running period.
5. The method according to claim 4, wherein the calculating the limit number of the charging devices that can be operated in the operation period based on the upper limit of the charging power that can be output by the charging station in the operation period and an upper limit of the charging power of a single charging device comprises:
and dividing the upper limit of the charging power output by the charging station in the operation period by the upper limit of the charging power of a single charging device, and turning the calculation result downwards to obtain the limit number of the charging devices capable of operating in the operation period.
6. The charging control method of the charging device according to any one of claims 1 to 3, wherein the adjusting the real-time charging power of the charging device based on the upper charging power limit and the usage of the charging device comprises:
when the sum of the real-time charging powers of all the charging devices is smaller than or equal to the charging power upper limit of all the current charging devices, maintaining that the sum of the real-time charging powers of all the current charging devices is smaller than or equal to the charging power upper limit of all the current charging devices, and increasing or decreasing the real-time charging power of the related charging devices in real time according to the demand information fed back by the user;
when the sum of the real-time charging power of all the charging equipment is larger than the charging power upper limit of all the charging equipment at present, analyzing the overrun power exceeding the charging power upper limit of all the charging equipment at present, and adjusting the real-time charging power of each charging equipment according to the overrun power in the same proportion.
7. The method of claim 6, wherein after the adjusting the real-time charging power of each charging device proportionally according to the overrun power, further comprising:
and if the real-time charging power of the charging equipment is smaller than zero after the charging equipment is adjusted downwards, enabling the real-time charging power of the charging equipment with the real-time charging power smaller than zero to return to zero, and averagely distributing the overrun power distributed to the charging equipment with the real-time charging power returned to zero to other running charging equipment.
8. The charging control method of the charging device according to claim 6, wherein the charging power upper limit of all the charging devices is calculated according to the current generated power of the power generation device, the maximum energy storage and discharge power in the operating period, and the maximum active power available to the power grid in the operating period.
9. The method of claim 1, wherein the sending the real-time charging power to a user and guiding the user to charge the charging device comprises:
adjusting charging electricity price according to the real-time charging power of the charging equipment;
and sending the charging electricity price and the real-time charging power to a user, and guiding the user to use a charging device for charging.
10. The charging control method of the charging device according to claim 9, wherein the adjusting of the charging electricity price according to the real-time charging power of the charging device comprises:
and calculating the current charging power price of each charging device according to the charging base power price and the current real-time charging power of each charging device, wherein the charging power price is linearly related to the current real-time charging power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211376130.6A CN115603328A (en) | 2022-11-04 | 2022-11-04 | Charging control method of charging equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211376130.6A CN115603328A (en) | 2022-11-04 | 2022-11-04 | Charging control method of charging equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115603328A true CN115603328A (en) | 2023-01-13 |
Family
ID=84852624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211376130.6A Pending CN115603328A (en) | 2022-11-04 | 2022-11-04 | Charging control method of charging equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115603328A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117118040A (en) * | 2023-10-24 | 2023-11-24 | 深圳市金致卓科技有限公司 | Multi-device compatible wireless charging output adjustment method, system and storage medium |
-
2022
- 2022-11-04 CN CN202211376130.6A patent/CN115603328A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117118040A (en) * | 2023-10-24 | 2023-11-24 | 深圳市金致卓科技有限公司 | Multi-device compatible wireless charging output adjustment method, system and storage medium |
| CN117118040B (en) * | 2023-10-24 | 2024-02-02 | 深圳市金致卓科技有限公司 | Multi-device compatible wireless charging output adjustment method, system and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ma et al. | Optimal allocation of hybrid energy storage systems for smoothing photovoltaic power fluctuations considering the active power curtailment of photovoltaic | |
| Wang et al. | Coordinated control of distributed energy-storage systems for voltage regulation in distribution networks | |
| JP3352662B2 (en) | Power system stabilizing apparatus and power system stabilizing method using secondary battery system | |
| CN110112783B (en) | Photovoltaic storage battery microgrid dispatching control method | |
| CN111244988B (en) | Electric automobile considering distributed power supply and energy storage optimization scheduling method | |
| CN110581571A (en) | dynamic optimization scheduling method for active power distribution network | |
| CN110783959B (en) | New forms of energy power generation system's steady state control system | |
| CN104882905A (en) | New energy available capability assessment method considering transient security constraints | |
| CN111355259A (en) | Energy coordination control method of light storage charging station | |
| CN110323785B (en) | Multi-voltage-level direct-current power distribution network optimization scheduling method for source network load storage interaction | |
| US20230294544A1 (en) | Method of Controlling of Battery Energy Storage System of Power System with High Dynamic Loads | |
| CN106712102B (en) | Control system and method for reducing light abandoning and electricity limiting of photovoltaic power station | |
| CN110061492B (en) | Energy storage system capacity optimal configuration method considering power supply reliability of power distribution network | |
| CN115603328A (en) | Charging control method of charging equipment | |
| CN114172242A (en) | Bidirectional charging and discharging system and control method thereof | |
| CN110768303A (en) | Optimization configuration method for equipment capacity of island-type energy system | |
| CN111211571A (en) | Transformer load rate maintenance control method and device based on user side energy storage | |
| Quan et al. | Optimal Energy Management of Vanadium Redox Flow Batteries Energy Storage System for Frequency Regulation and Peak Shaving in an Islanded Microgrid | |
| CN116544991A (en) | Wind power uncertainty-considered wind power and storage combined optimization scheduling method | |
| CN116187702A (en) | Source network and charge storage collaborative interaction optimization scheduling system | |
| CN112583020B (en) | Two-stage voltage control method for low-voltage distribution network | |
| CN106953346B (en) | Off-grid micro-grid energy management method for sodium-sulfur battery | |
| CN109599898B (en) | Control method and device for improving consumption of distributed power supply | |
| CN110417002B (en) | Optimization method of island micro-grid energy model | |
| Taira et al. | Assessment of impact of distributed generators, plug-in electric vehicle and Battery Energy Storage System on power distribution losses |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |