CN115891735A - Charging power scheduling device - Google Patents
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Abstract
The invention provides a charging power scheduling device, comprising: the power acquisition module is responsible for acquiring the power output value of each charging pile at the current moment; the power dividing module is responsible for dividing high power, medium power and low power according to the power output value; the battery electric quantity acquisition module is in charge of acquiring the battery electric quantity of the electric vehicle at the current moment and comparing the battery electric quantity with the maximum value of the battery electric quantity of the electric vehicle; and the power scheduling module is responsible for receiving a charging power scheduling instruction of the battery electric quantity acquisition module, and the power acquisition module with high power or medium power preferentially acquires the power output value of each charging pile at the current moment. The invention can very clearly determine the operation condition of the current charging pile, marks the charging pile with abundant power, lays a foundation for subsequent power distribution, has simple standard for dividing the power into high power, medium power and low power, is easy to operate, can be flexibly set according to the actual condition of each charging station, and has strong operability.
Description
Technical Field
The invention relates to the technical field of charging control, in particular to a charging power scheduling device.
Background
With the gradual increase of new energy vehicle equipment, the number and performance of charging equipment are more and more important; the charging pile with a large number is arranged in the charging station, charging of a plurality of vehicles is achieved, charging is convenient and fast, space and energy are efficiently utilized, each charging pile is independently controlled, power cannot be adjusted, the maximum utilization of the power of the charging pile cannot be achieved, and the energy is wasted to a certain extent.
In the prior art, CN201710640601.2 is a method and a system for adjusting charging power of an electric vehicle, in which a planned power of charging power of the electric vehicle is determined, the planned power of dispatching is related to an electrical load, and the larger the electrical load is, the smaller the planned power of dispatching is; and then, the actual charging power of each electric automobile which receives demand response management is obtained according to the scheduling plan power, the actual charging power is positively correlated with the scheduling plan power, and the smaller the scheduling plan power is, the smaller the actual charging power of the corresponding electric automobile is. The charging power of the electric automobile is reduced in the electricity utilization peak period through the adjustment of the charging power; and in the valley period of power utilization, the electric automobile is released for charging. Although the system carries out orderly guide and real-time power control to electric automobile charges, on the basis of make full use of current distribution network resource, realize reducing the charging load to a certain extent at power consumption peak period, carry out the peak clipping to the electric wire netting and fill the millet, it is poor to stabilize the peak millet difference of electric wire netting, it is undulant to weaken the electric wire netting load, promote electric wire netting stability, but only to single electric pile that fills, do not schedule a plurality of electric pile's power, lead to the maximize utilization that can not realize filling electric pile power, the energy has still been wasted to a certain extent.
In the second prior art, CN201710640534.4 is an electric vehicle charging station dispatching system and an ordered charging control method, which allocate the total target power consumption issued by a higher-level dispatching system among ordered charging piles on the basis of comprehensively considering the maximum charging power of the ordered charging piles with adjustable charging power in the charging station and the target power consumption issued by the higher-level dispatching system, so that the charging power of each ordered charging pile takes values between the minimum charging power and the maximum charging power, thereby comprehensively managing the charging power of the charging piles in the charging station. Although the method can realize the establishment of power sharing, the charging behavior of the electric automobile is guided to transition from a one-way disordered random charging mode to an ordered charging mode, the off-peak charging is realized, the load fluctuation of a power grid is reduced, the energy loss of the power grid is reduced, and the reliability and the economic benefit of the power distribution network are improved, each charging pile is independently controlled, the power is not adjustable, and the maximum utilization of the power of the charging pile cannot be realized.
In the third prior art, CN202210143250.5 power scheduling method, apparatus, computer device and storage medium, the method includes: acquiring a first number of charging interface devices and a second number of power module groups, and acquiring a connection relation set for connecting the charging interface devices through relays and the power module groups; generating a first relation table of the charging interface equipment and the power module group according to the first quantity, the second quantity and the connection relation set; generating a power scheduling path table corresponding to each expected power according to the first relation table and a preset priority rule; the method comprises the steps of obtaining the required power of external equipment connected with charging interface equipment, and obtaining a first power dispatching path with the expected power matched with the required power from a power dispatching path table; and acquiring corresponding charging interface equipment, a relay and a power module group according to the first power scheduling path to charge the external equipment. Although the unification of a plurality of power adjustment methods is achieved, power adjustment for a plurality of charging piles in the same time period is lacked, resulting in that charging power cannot be maximized.
At present, in the first prior art, the second prior art and the third prior art, only a single charging pile is used, the power of a plurality of charging piles is not scheduled, so that the maximum utilization of the power of the charging piles cannot be realized, and the problem of energy waste is solved to a certain extent.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a charging power scheduling apparatus, including:
the power acquisition module is responsible for acquiring the power output value of each charging pile at the current moment;
the power dividing module is responsible for dividing high power, medium power and low power according to the power output value;
the battery electric quantity acquisition module is in charge of acquiring the battery electric quantity of the electric vehicle at the current moment and comparing the battery electric quantity with the maximum value of the battery electric quantity of the electric vehicle;
and the power scheduling module is in charge of receiving the charging power scheduling instruction of the battery electric quantity acquisition module and preferentially distributing power from the high-power or medium-power charging pile to the charging pile connected with the electric vehicle.
Optionally, the high power, the medium power and the low power are preset for the charging station according to actual conditions.
Optionally, the battery power of the electric vehicle is compared with the maximum value of the battery power of the electric vehicle, when the difference is smaller than the threshold, the charging power scheduling is started, and when the difference is not smaller than the threshold, the charging power of the current charging pile is maintained.
Optionally, the power obtaining module includes:
the current input sub-module is responsible for carrying out current sampling on the electric signal of the charging pile through a current transformer according to the current sampling frequency of the charging pile to obtain a current value;
the voltage input sub-module is responsible for carrying out voltage sampling on the electric signals of the charging pile through a voltage transformer according to the voltage sampling frequency of the charging pile to obtain a voltage value;
and the power calculation submodule is responsible for obtaining the input power of the charging pile according to the obtained current value and the obtained voltage value.
Optionally, the power dividing module includes:
the threshold setting submodule is responsible for presetting numerical value ranges of high power, medium power and low power;
the numerical value selection submodule is responsible for arranging the power output values from small to large according to the power output values to obtain a set of the power output values;
the numerical value comparison submodule is responsible for comparing numerical values in the set of power output values with a preset numerical range of high power and medium power, and the rest numerical values in the set of power output values are low power;
and the power set submodule is responsible for taking the high-power charging piles as a first power set, taking the medium-power charging piles as a second power set and taking the low-power charging piles as a third power set according to the value comparison and combination of the value comparison submodule.
Optionally, the battery power obtaining module includes:
the battery electric quantity acquisition submodule is connected with a controller of the electric vehicle through a charging gun and is responsible for acquiring the electric energy storage quantity of the current electric power calculated by the controller;
the battery electric quantity comparison submodule is responsible for subtracting the maximum electric energy storage quantity of the battery from the acquired electric energy storage quantity to obtain a difference value of the maximum electric energy storage quantity and the electric energy storage quantity;
and the difference value judging submodule is responsible for comparing the difference value obtained by the battery electric quantity comparison submodule with a threshold value of a system, starting charging power scheduling when the difference value is smaller than the threshold value, and keeping the charging power of the current charging pile when the difference value is not smaller than the threshold value.
Optionally, the power scheduling module includes:
the total power acquisition sub-module is responsible for taking all the charging piles as a whole and obtaining the output power of each charging pile according to the circuit equivalent circuit of the charging pile;
the charging efficiency calculation submodule is responsible for calculating the active power of each charging pile and obtaining the charging efficiency of the charging piles by combining the output power;
and the target function establishing submodule is responsible for establishing a target function of charging power scheduling by taking the maximum charging efficiency as a target.
Optionally, the charging efficiency calculating sub-module includes:
the typical scene set screening unit is responsible for generating a correlation scene which accords with power fluctuation according to the active power of each charging pile, and screening the active power scene set of the charging piles by adopting scene tree reconstruction;
the optimal control quantity unit is responsible for the charging efficiency calculation submodule to regenerate a new random scene in real time according to the feedback load state of the electric vehicle, an output power prediction sequence of future time is obtained through a random model of the output power according to the output power of the sampling moment of the active power, and optimization is carried out in a prediction time interval to obtain an optimal control variable of the active power;
the power control strategy unit is responsible for taking an active power curve of the charging pile, which contains optimal control variables, as a reference track, constructing a real-time control model with the maximum expected maximum power shortage of the charging pile as a target, and establishing a random model predictive control strategy of the active power of the charging pile to obtain the active power of each charging pile;
optionally, the power control policy unit includes:
the error calculation subunit is responsible for analyzing errors caused by uncertainty in the active power sampling process;
the average value operator unit is responsible for calculating the average value of the active power of all the sampled charging piles;
the first power syndrome unit is responsible for subtracting the error from the average value of the active power to obtain the corrected active power;
the second power syndrome unit is responsible for multiplying the corrected active power by the proportional error adjustment coefficient to obtain the active power after the proportional error correction;
and the compensation active power subunit is responsible for carrying out angle error compensation calculation on the active power after the ratio error correction so as to obtain the final compensated active power.
Optionally, the expression of the objective function f is as follows:
wherein N identifies the number of units, α, of the charging pile involved i The switching factor of the ith charging pile is represented, i =0 represents that the charging pile does not work, and i =1 represents that the charging pile works;
represents the discharge power loss of the ith charging pile and is used for judging whether the charging pile is charged or not>
RepresentThe charging power loss of the ith charging pile.
The power acquisition module is responsible for acquiring the power output value of each charging pile at the current moment; the power dividing module is used for dividing high power, medium power and low power according to the power output value, and the high power, the medium power and the low power are preset by the charging station according to actual conditions; the battery electric quantity acquisition module is responsible for acquiring the battery electric quantity of the electric vehicle at the current moment, comparing the battery electric quantity with the maximum value of the battery electric quantity of the electric vehicle, starting charging power scheduling when the difference value is smaller than the threshold value, and keeping the charging power of the current charging pile when the difference value is not smaller than the threshold value; the power scheduling module is used for receiving a charging power scheduling instruction of the battery electric quantity acquisition module and preferentially distributing power from the high-power or medium-power charging pile to the charging pile connected with the electric vehicle. According to the invention, the power of each charging pile which is currently operated is divided, so that the operation condition of the current charging pile can be very clear, the charging piles with abundant power are marked, a foundation is laid for subsequent power distribution, the power is divided into high power, medium power and low power, the standard is simple, the operation is easy, the actual condition of each charging station can be flexibly set, and the operability is strong; the charging state of the current charging vehicle can be obtained by comparing the battery capacity of the charging vehicle with the maximum value of the battery capacity, if the battery capacity exceeds the threshold value compared with the maximum value, the charging time is longer, at the moment, a part of power needs to be distributed to the charging pile with high power or medium power, the input power of the charging pile is increased, and the charging time is shortened.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a block diagram of a charging power scheduling apparatus according to an embodiment of the present invention;
FIG. 2 is a block diagram of a power harvesting module in an embodiment of the present invention;
FIG. 3 is a block diagram of a power partitioning module in an embodiment of the present invention;
FIG. 4 is a block diagram of a power aggregation sub-module in an embodiment of the invention;
FIG. 5 is a block diagram of a battery power acquisition module according to an embodiment of the present invention;
FIG. 6 is a block diagram of a power scheduling module according to an embodiment of the present invention;
fig. 7 is a block diagram of a charging efficiency calculation submodule in an embodiment of the present invention;
fig. 8 is a block diagram of a power control policy unit according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a charging power scheduling apparatus, including:
the power acquisition module is responsible for acquiring the power output value of each charging pile at the current moment;
the power dividing module is responsible for dividing high power, medium power and low power according to the power output value, and the high power, the medium power and the low power are preset by the charging station according to actual conditions;
the battery electric quantity acquisition module is responsible for acquiring the battery electric quantity of the electric vehicle at the current moment, comparing the battery electric quantity with the maximum value of the battery electric quantity of the electric vehicle, starting charging power scheduling when the difference value is smaller than the threshold value, and keeping the charging power of the current charging pile when the difference value is not smaller than the threshold value;
and the power scheduling module is in charge of receiving the charging power scheduling instruction of the battery electric quantity acquisition module and preferentially distributing power from the high-power or medium-power charging pile to the charging pile connected with the electric vehicle.
The working principle and the beneficial effects of the technical scheme are as follows: the scheme power acquisition module is responsible for acquiring the power output value of each charging pile at the current moment; the power dividing module is used for dividing high power, medium power and low power according to the power output value, and the high power, the medium power and the low power are preset by the charging station according to actual conditions; the battery electric quantity acquisition module is responsible for acquiring the battery electric quantity of the electric vehicle at the current moment, comparing the battery electric quantity with the maximum value of the battery electric quantity of the electric vehicle, starting charging power scheduling when the difference value is smaller than the threshold value, and keeping the charging power of the current charging pile when the difference value is not smaller than the threshold value; the power scheduling module is used for receiving a charging power scheduling instruction of the battery electric quantity acquisition module and preferentially distributing power from the high-power or medium-power charging pile to the charging pile connected with the electric vehicle. According to the invention, the power of each charging pile which is currently operated is divided, so that the operation condition of the current charging pile can be very clear, the charging piles with abundant power are marked, a foundation is laid for subsequent power distribution, the power is divided into high power, medium power and low power, the standard is simple, the operation is easy, the actual condition of each charging station can be flexibly set, and the operability is strong; the charging state of the current charging vehicle can be obtained by comparing the electric quantity of the battery of the charging vehicle with the maximum value of the electric quantity, if the electric quantity exceeds the threshold value compared with the maximum value, the charging time is longer, at the moment, a part of power needs to be distributed to the charging pile with high or medium power, the input power of the charging pile is increased, and the charging time is shortened.
Example 2
As shown in fig. 2, on the basis of embodiment 1, the power obtaining module provided in the embodiment of the present invention includes:
the current input sub-module is responsible for carrying out current sampling on the electric signal of the charging pile through a current transformer according to the current sampling frequency of the charging pile to obtain a current value;
the voltage input sub-module is responsible for carrying out voltage sampling on the electric signals of the charging pile through a voltage transformer according to the voltage sampling frequency of the charging pile to obtain a voltage value;
and the power calculation submodule is responsible for obtaining the input power of the charging pile according to the obtained current value and the obtained voltage value.
The working principle and the beneficial effects of the technical scheme are as follows: the current input sub-module is responsible for carrying out current sampling on an electric signal of the charging pile through a current transformer according to the current sampling frequency of the charging pile to obtain a current numerical value; the voltage input sub-module is used for carrying out voltage sampling on the electric signals of the charging pile through a voltage transformer according to the voltage sampling frequency of the charging pile to obtain a voltage numerical value; the power calculation sub-module is responsible for obtaining the input power of the charging pile according to the obtained current value and the obtained voltage value; through the current value and the voltage value to each charging pile sampling, each charging pile's power can be obtained through the sampling, the accurate value of the power of charging pile is improved, reliable data are provided for the division of charging pile power, and the effect of charging power scheduling is guaranteed to a certain extent.
Example 3
On the basis of the embodiment 2, the error of the current value obtained by the current transformer provided by the embodiment of the invention is as follows:
wherein, eI j′ In order to be an error in the value of the current,
represents the actual current value at time k>
Represents a current prediction value, is greater than or equal to>
Represents the current change at a further time k-1>
Representing the current sample value of the current transformer at time k-1,
represents the change in current in the (k-1) T period, is present>
Indicating a change in current in the (k-2) T period>
Denotes the input voltage vector in the (k-1) T periodVolume, or>
Represents the electrical input voltage vector, v |, in the (k-1) T period>
Denotes the vector of input voltages not applied in the (k-1) T period, and j denotes the number of vectors of input voltages at different times.
The working principle and the beneficial effects of the technical scheme are as follows: according to the scheme, the current transformer obtains the error of the current value through calculation, because the voltage fluctuates to a certain degree in the actual use of the charging pile, if the power is calculated without combining the changed voltage, the numerical error of the power is easy to cause large, the scheduling and distribution of the charging power can be directly influenced, the reasonable utilization of the electric energy is influenced, and the resource waste is caused; the changed voltage is involved in calculation to obtain the error of the current value, so that an accurate power value is obtained, and the capability of charging power scheduling is greatly improved.
Example 4
As shown in fig. 3, on the basis of embodiment 1, the power dividing module provided in the embodiment of the present invention includes:
the threshold setting submodule is responsible for presetting numerical value ranges of high power, medium power and low power;
the numerical value selection submodule is responsible for arranging the power output values from small to large according to the power output values to obtain a set of the power output values;
the numerical value comparison submodule is responsible for comparing numerical values in the set of power output values with a preset numerical range of high power and medium power, and the rest numerical values in the set of power output values are low power;
and the power set submodule is responsible for taking the high-power charging piles as a first power set, taking the medium-power charging piles as a second power set and taking the low-power charging piles as a third power set according to the value comparison and combination of the value comparison submodule.
The working principle and the beneficial effects of the technical scheme are as follows: the threshold setting submodule of the scheme is responsible for presetting numerical value ranges of high power, medium power and low power; the numerical value selection submodule is responsible for arranging the power output values from small to large according to the power output values to obtain a set of the power output values; the numerical value comparison sub-module is responsible for comparing numerical values in the set of power output values with numerical ranges of preset high power and medium power, and the rest numerical values in the set of power output values are low power; the power set submodule is responsible for taking the high-power charging piles as a first power set, the medium-power charging piles as a second power set and the low-power charging piles as an electric power set according to the value comparison combination of the value comparison submodule. The power output values of the charging piles are arranged according to a certain sequence, so that the efficiency of dividing the power output values is improved, the power dividing time is shortened, the charging power scheduling time is advanced, and the charging time is shortened; high power, medium power and low power are respectively placed in a data set, so that the system can be called conveniently, a target charging pile can be directly found, and the charging power can be scheduled and redistributed.
Example 5
As shown in fig. 4, on the basis of embodiment 4, the power aggregation sub-module provided in the embodiment of the present invention includes:
the equipment corresponding unit is responsible for corresponding power output values in the first power set, the second power set and the third power set to the charging pile identifications one by one;
the data sharing unit is responsible for sharing each power output value of the power set submodule with the intelligent terminal, and a user can actively adjust power through the terminal;
and the data storage unit is responsible for storing each power output value in the first power set, the second power set and the third power set according to the data set name and the charging pile identifier.
The working principle and the beneficial effects of the technical scheme are as follows: the equipment corresponding unit of the scheme corresponds each power output value in the first power set, the second power set and the third power set to the charging pile identification one by one; the data sharing unit shares each power output value of the power set submodule with the intelligent terminal, and a user can actively adjust power through the terminal; the data storage unit stores each power output value in the first power set, the second power set and the third power set according to the data set name and the charging pile identification; the invention realizes the one-to-one correspondence between the charging pile and the power output value thereof, is convenient for the system to rapidly realize the scheduling of the charging power and improves the charging experience of users; the display of the power output value on the intelligent terminal is realized through the data sharing unit, so that a user can know the scheduling process of the charging power in time conveniently, and meanwhile, the user can also realize the power regulation independently through the terminal, thereby embodying the humanized design of equipment; the data storage unit stores the data by adopting the data set name and the charging pile identification, so that the data storage is clearer and conditioned, the cache pressure during system storage is reduced, the storage space can be utilized to the maximum extent, and the stored power output value can be conveniently called.
Example 6
As shown in fig. 5, on the basis of embodiment 1, the battery power obtaining module according to the embodiment of the present invention includes:
the battery electric quantity acquisition submodule is connected with a controller of the electric vehicle through a charging gun and is responsible for acquiring the electric energy storage quantity of the current electric power calculated by the controller;
the battery electric quantity comparison submodule is responsible for subtracting the maximum electric energy storage quantity of the battery from the acquired electric energy storage quantity to obtain a difference value between the maximum electric energy storage quantity and the electric energy storage quantity;
and the difference value judgment submodule is responsible for comparing the difference value obtained by the battery electric quantity comparison submodule with a threshold value of the system, starting charging power scheduling when the difference value is smaller than the threshold value, and keeping the charging power of the current charging pile when the difference value is not smaller than the threshold value.
The working principle and the beneficial effects of the technical scheme are as follows: the battery electric quantity acquisition submodule in the scheme acquires the electric energy storage quantity of the current electric power calculated by the controller; the battery electric quantity comparison submodule subtracts the maximum electric energy storage quantity of the battery from the obtained electric energy storage quantity to obtain a difference value of the maximum electric energy storage quantity and the electric energy storage quantity; the difference value judgment submodule compares the difference value obtained by the battery electric quantity comparison submodule with a threshold value of a system, when the difference value is smaller than the threshold value, the charging power scheduling is started, and when the difference value is not smaller than the threshold value, the charging power of the current charging pile is kept; the charging condition of the current electric vehicle is judged by adopting the electric energy storage amount, whether the input power of the charging pile needs to be increased or not is judged in time, the purpose of shortening the charging time is achieved, and the collected data are real-time and effective; whether the charging power needs to be scheduled or not is judged through the difference value obtained by the battery electric quantity comparison submodule, the method is simple and time-saving, and the problem of high research and development cost caused by adoption of a large number of operations is solved.
Example 7
As shown in fig. 6, on the basis of embodiment 1, a power scheduling module provided in an embodiment of the present invention includes:
the total power acquisition sub-module is responsible for taking all the charging piles as a whole and obtaining the output power of each charging pile according to the circuit equivalent circuit of the charging pile;
the charging efficiency calculation submodule is responsible for calculating the active power of each charging pile and obtaining the charging efficiency of the charging piles by combining the output power;
and the target function establishing submodule is responsible for establishing a target function of charging power scheduling by taking the maximum charging efficiency as a target.
The working principle and the beneficial effects of the technical scheme are as follows: according to the scheme, the total power obtaining sub-module takes all the charging piles as a whole, and obtains the output power of each charging pile according to the circuit equivalent circuit of the charging pile; the charging efficiency calculation submodule calculates the active power of each charging pile and obtains the charging efficiency of the charging pile by combining the output power; and the target function establishing sub-module establishes a target function of charging power scheduling by taking the maximum charging efficiency as a target. By calculating the charging efficiency of the charging pile, the running state of the charging pile can be known in time, and data reference is provided for later maintenance; by adopting the maximum value of the charging efficiency as a target, a target function is established, a control basis is provided for the scheduling of the charging power, the power distribution is optimized, and the charging experience of a user can be improved while the economic benefit is increased.
Example 8
As shown in fig. 7, on the basis of embodiment 7, the charging efficiency calculation sub-module provided in the embodiment of the present invention includes:
the typical scene set screening unit is responsible for generating a correlation scene which accords with power fluctuation according to the active power of each charging pile, and screening the active power scene set of the charging piles by adopting scene tree reconstruction;
the optimal control quantity unit is responsible for the charging efficiency calculation submodule to regenerate a new random scene in real time according to the feedback load state of the electric vehicle, an output power prediction sequence of future time is obtained through a random model of the output power according to the output power of the sampling moment of the active power, and optimization is carried out in a prediction time interval to obtain an optimal control variable of the active power;
the power control strategy unit is responsible for taking an active power curve of the charging piles, which contains optimal control variables, as a reference track, constructing a real-time control model with the maximum expected power shortage of the charging piles as a target, and establishing a random model predictive control strategy of the active power of the charging piles to obtain the active power of each charging pile;
the working principle and the beneficial effects of the technical scheme are as follows: the typical scene set screening unit of the scheme generates a correlation scene which accords with power fluctuation according to the active power of each charging pile, and screens out the typical scene set of the active power of the charging piles by adopting scene tree reconstruction; the charging efficiency calculation submodule of the optimal control quantity unit regenerates a new random scene in real time according to the feedback load state of the electric vehicle, obtains an output power prediction sequence of future time by a random model of the output power according to the output power of the sampling moment of the active power, and optimizes the output power prediction sequence in a prediction time interval to obtain an optimal control variable of the active power; the power control strategy unit takes a charging pile active power curve as a reference track, constructs a real-time control model with the maximum expected charging pile power shortage as a target, and establishes a random model predictive control strategy of the charging pile active power to obtain the active power of each charging pile; an active power scene set of the charging pile is screened out through scene tree reconstruction, and the active power is closer to the reality through a typical scene set, so that the active power can truly reflect the actual working condition of the charging pile; and constructing a real-time control model with the maximum expected power shortage of the charging pile as a target, and establishing the maximum charging efficiency of the submodules by taking the maximum expected power shortage of the charging pile as a target function.
Example 9
As shown in fig. 8, on the basis of embodiment 8, a power control policy unit provided in an embodiment of the present invention includes:
the error calculation subunit is responsible for analyzing errors caused by uncertainty in the active power sampling process;
the average value calculating operator unit is responsible for calculating the average value of the active power of all the sampled charging piles;
the first power syndrome unit is responsible for subtracting the error from the average value of the active power to obtain the corrected active power;
the second power syndrome unit is responsible for multiplying the corrected active power by the proportional error adjustment coefficient to obtain the active power after the proportional error correction;
and the compensation active power subunit is responsible for carrying out angle error compensation calculation on the active power after the ratio error correction so as to obtain the final compensated active power.
The working principle and the beneficial effects of the technical scheme are as follows: the error calculation subunit of the scheme is responsible for analyzing errors caused by uncertainty in the active power sampling process; the average value operator unit is responsible for calculating the average value of the active power of all the sampled charging piles; the first power syndrome unit is responsible for subtracting the error from the average value of the active power to obtain the corrected active power; the second power syndrome unit is responsible for multiplying the corrected active power by the proportional error adjustment coefficient to obtain the active power after the proportional error correction; the compensation active power subunit is responsible for carrying out angle error compensation calculation on the active power after the ratio error correction so as to obtain the final compensated active power; the active power is obtained after compensation is carried out, a random model prediction control strategy of the active power of the charging pile is realized, and the active power with high precision can be obtained finally.
Example 10
On the basis of embodiment 7, the expression of the objective function f provided by the embodiment of the present invention is as follows:
wherein N identifies the number of units, α, of the charging pile involved i The switching factor of the ith charging pile is represented, i =0 represents that the charging pile does not work, and i =1 represents that the charging pile works;
represents the discharge power loss of the ith charging pile and is used for judging whether the charging pile is charged or not>
And representing the charging power loss of the ith charging pile.
The working principle and the beneficial effects of the technical scheme are as follows: according to the scheme, the maximum value of the charging efficiency is used as a target, the target function of the charging power scheduling is established, a control basis is provided for the scheduling of the charging power, the power distribution is optimized, and the charging experience of a user can be improved while the economic benefit is increased.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A charging power scheduling apparatus, comprising:
the power acquisition module is responsible for acquiring the power output value of each charging pile at the current moment;
the power dividing module is responsible for dividing high power, medium power and low power according to the power output value;
the battery electric quantity acquisition module is in charge of acquiring the battery electric quantity of the electric vehicle at the current moment and comparing the battery electric quantity with the maximum value of the battery electric quantity of the electric vehicle;
and the power scheduling module is in charge of receiving the charging power scheduling instruction of the battery electric quantity acquisition module and preferentially distributing power from the high-power or medium-power charging pile to the charging pile connected with the electric vehicle.
2. The charging power scheduling apparatus of claim 1, wherein the high power, the medium power and the low power are preset for the charging station according to actual conditions.
3. The charging power scheduling apparatus of claim 1, wherein the battery capacity of the electric vehicle is compared with a maximum value of the battery capacity of the electric vehicle, and when the difference is less than a threshold, the charging power scheduling is started, and when the difference is not less than the threshold, the charging power of the charging post is maintained.
4. The charging power scheduling apparatus of claim 1, wherein the power obtaining module comprises:
the current input sub-module is responsible for carrying out current sampling on the electric signal of the charging pile through a current transformer according to the current sampling frequency of the charging pile to obtain a current value;
the voltage input sub-module is responsible for carrying out voltage sampling on the electric signals of the charging pile through a voltage transformer according to the voltage sampling frequency of the charging pile to obtain a voltage value;
and the power calculation submodule is responsible for obtaining the input power of the charging pile according to the obtained current value and the obtained voltage value.
5. The charging power scheduling apparatus of claim 1, wherein the power dividing module comprises:
the threshold setting submodule is responsible for presetting numerical value ranges of high power, medium power and low power;
the numerical value selection submodule is responsible for arranging the power output values from small to large according to the power output values to obtain a set of the power output values;
the numerical value comparison submodule is responsible for comparing numerical values in the set of power output values with a preset numerical range of high power and medium power, and the rest numerical values in the set of power output values are low power;
and the power set submodule is responsible for taking the high-power charging piles as a first power set, taking the medium-power charging piles as a second power set and taking the low-power charging piles as a third power set according to the value comparison and combination of the value comparison submodule.
6. The charging power scheduling apparatus of claim 1, wherein the battery level acquiring module comprises:
the battery electric quantity acquisition submodule is connected with a controller of the electric vehicle through a charging gun and is responsible for acquiring the electric energy storage quantity of the current electric power calculated by the controller;
the battery electric quantity comparison submodule is responsible for subtracting the maximum electric energy storage quantity of the battery from the acquired electric energy storage quantity to obtain a difference value between the maximum electric energy storage quantity and the electric energy storage quantity;
and the difference value judgment submodule is responsible for comparing the difference value obtained by the battery electric quantity comparison submodule with a threshold value of the system, starting charging power scheduling when the difference value is smaller than the threshold value, and keeping the charging power of the current charging pile when the difference value is not smaller than the threshold value.
7. The charge power scheduling apparatus of claim 1, wherein the power scheduling module comprises:
the total power acquisition sub-module is responsible for taking all the charging piles as a whole and obtaining the output power of each charging pile according to the circuit equivalent circuit of the charging pile;
the charging efficiency calculation submodule is responsible for calculating the active power of each charging pile and obtaining the charging efficiency of the charging piles by combining the output power;
and the target function establishing submodule is responsible for establishing a target function of charging power scheduling by taking the maximum charging efficiency as a target.
8. The charging power scheduling apparatus of claim 7, wherein the charging efficiency calculation submodule includes:
the typical scene set screening unit is responsible for generating a correlation scene which accords with power fluctuation according to the active power of each charging pile, and screening the active power scene set of the charging piles by adopting scene tree reconstruction;
the optimal control quantity unit is responsible for the charging efficiency calculation submodule to regenerate a new random scene in real time according to the feedback load state of the electric vehicle, an output power prediction sequence of future time is obtained through a random model of the output power according to the output power of the sampling moment of the active power, and optimization is carried out in a prediction time interval to obtain an optimal control variable of the active power;
and the power control strategy unit is responsible for taking an active power curve of the charging pile containing the optimal control variable as a reference track, constructing a real-time control model with the maximum expected maximum power shortage of the charging pile as a target, and establishing a stochastic model predictive control strategy of the active power of the charging pile to obtain the active power of each charging pile.
9. The charging power scheduling apparatus of claim 8, wherein the power control policy unit comprises:
the error calculation subunit is responsible for analyzing errors caused by uncertainty in the active power sampling process;
the average value calculating operator unit is responsible for calculating the average value of the active power of all the sampled charging piles;
the first power syndrome unit is responsible for subtracting the error from the average value of the active power to obtain the corrected active power;
the second power corrector subunit is responsible for multiplying the corrected active power by the proportional error adjustment coefficient to obtain the active power after the proportional error correction;
and the compensation active power subunit is responsible for carrying out angle error compensation calculation on the active power after the ratio error correction so as to obtain the final compensated active power.
10. The charging power scheduling apparatus of claim 7, wherein the objective function f is expressed as follows:
wherein N identifies the number of units, α, of the charging pile involved i The switching factor of the ith charging pile is represented, i =0 represents that the charging pile does not work, and i =1 represents that the charging pile works;
represents the discharge power loss of the ith charging pile and is combined with the charging pile>
And representing the charging power loss of the ith charging pile. />
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