1. An electric vehicle charging system based on an intelligent fusion terminal is characterized by comprising the intelligent fusion terminal and a plurality of charging piles, wherein the intelligent fusion terminal is respectively connected with the charging piles; the intelligent integration terminal is used for collecting the total load of the distribution transformer and the charging power of each charging pile, and performing ordered charging control on each charging pile according to the total load of the distribution transformer and the charging power of each charging pile.

2. The electric vehicle charging system based on the intelligent convergence terminal of claim 1, wherein the intelligent convergence terminal is in communication connection with each charging pile through a LoRa communication module.

3. The charging method of the intelligent integrated terminal-based electric vehicle charging system based on claim 1 or 2 is characterized by comprising the following steps:

acquiring total load of a distribution transformer and charging power data of all charging piles in real time through a platform area intelligent fusion terminal;

when the distribution residual power is sufficient and is larger than the set first residual power limit value, the direct charging can be carried out;

when the load of the common residents of the distribution transformer rises and the residual power is less than the set second residual power limit value, orderly charging control is carried out: sequencing and selecting according to the charging time and the charging amount, reducing the charging power of a charged charging pile, and charging the newly-accessed charging pile according to high power;

and when the load of the common resident of the distribution transformer continues to rise and the residual power is less than the set third residual power limit value, reducing the charging power of the charged charging pile, and charging the newly-accessed charging pile according to low power.

4. The charging method according to claim 3, wherein when all the charging piles are adjusted and still overloaded, the charging of the charging piles is cut off in sequence according to the charging time sequence.

5. The charging method according to claim 4, wherein if the residential load of the distribution substation is decreased and the residual power of the distribution substation is greater than the first residual power limit value, the charging power of each charging pile is increased in the order of the power down time of the ordered charging pile.

6. A charging method according to any one of claims 3 to 5, wherein the low power of the charging is 1 to 2kW and the high power of the charging is 6 to 8 kW.

7. The charging method according to any one of claims 3 to 5, wherein the second residual power limit is 80 to 120 kVA; the third residual power limit value is 40-60 kVA.

Background

At present, the charging demand of people's district is constantly increasing, and the pressure that the power distribution network faces is great, and most users can charge electric automobile after returning home basically, can make the peak period of power consumption load roughly coincide with the time of charging like this to lead to the further stack of load peak value, aggravated distribution network load pressure, threaten the safe and reliable of platform district power supply. The large-scale unordered charging can bring huge challenge to the safe, economic, the reliability operation of electric wire netting, and the current net of joining in marriage hardly bears the unordered requirement of charging of residential area, if join in marriage net transformation, then invest in greatly and reform transform for a long time.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the problems in the prior art, the invention provides the electric vehicle charging system and the charging method based on the intelligent fusion terminal, which are simple and convenient to operate, low in cost and reliable and orderly in charging.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

an electric vehicle charging system based on an intelligent fusion terminal comprises the intelligent fusion terminal and a plurality of charging piles, wherein the intelligent fusion terminal is respectively connected with the charging piles; the intelligent integration terminal is used for collecting the total load of the distribution transformer and the charging power of each charging pile, and performing ordered charging control on each charging pile according to the total load of the distribution transformer and the charging power of each charging pile.

As a further improvement of the above technical solution:

the intelligent integration terminal is communicated with the charging piles through the LoRa communication modules.

The invention also discloses a charging method of the electric vehicle charging system based on the intelligent fusion terminal, which comprises the following steps:

acquiring total load of a distribution transformer and charging power data of all charging piles in real time through a platform area intelligent fusion terminal;

when the distribution residual power is sufficient and is larger than the set first residual power limit value, the direct charging can be carried out;

when the load of the common residents of the distribution transformer rises and the residual power is less than the set second residual power limit value, orderly charging control is carried out: sequencing and selecting according to the charging time and the charging amount, reducing the charging power of a charged charging pile, and charging the newly-accessed charging pile according to high power;

and when the load of the common resident of the distribution transformer continues to rise and the residual power is less than the set third residual power limit value, reducing the charging power of the charged charging pile, and charging the newly-accessed charging pile according to low power.

As a further improvement of the above technical solution:

and when all the charging piles are adjusted and still overloaded, the charging of the charging piles is cut off in sequence according to the charging time sequence.

And if the residential load of the distribution area is reduced and the residual power of the distribution area is greater than the first residual power limit value, the charging power of each charging pile is increased according to the sequence of the power reduction time of the ordered charging piles.

The low power of charging is 1 ~ 2kW, and the high power of charging is 6 ~ 8 kW.

The second residual power limit value is 80-120 kVA; the third residual power limit value is 40-60 kVA.

Compared with the prior art, the invention has the advantages that:

according to the electric vehicle charging system and the charging method based on the intelligent fusion terminal, ordered charging control is performed on each charging pile through the total load of the distribution transformer and the charging power of each charging pile, distribution network transformation is not needed, the cost is low, and charging is ordered and reliable; the whole charging method is simple and convenient to operate and reliable and orderly in charging.

Drawings

Fig. 1 is a schematic structural diagram of a charging system according to an embodiment of the present invention.

FIG. 2 is a block diagram of two communication schemes of the charging system of the present invention; wherein (a) the charging pile is not connected to the Internet of vehicles; (b) the car networking is inserted for filling electric pile.

Fig. 3 is a control mode structure diagram of the charging system according to the embodiment of the present invention.

Fig. 4 is a general flowchart of a charging method according to an embodiment of the present invention.

Fig. 5 is a flowchart illustrating a charging method according to an embodiment of the present invention.

Fig. 6 is a flow chart of the charging method according to the present invention when the distribution load continuously rises.

Fig. 7 is a flow chart of the charging method of the present invention when the distribution load is overloaded.

Detailed Description

The invention is further described below with reference to the figures and the specific embodiments of the description.

As shown in fig. 1 and fig. 2, the electric vehicle charging system based on the intelligent fusion terminal of the embodiment includes the intelligent fusion terminal, the ordered charging communication unit, the alternating-current charging pile, the intelligent circuit breaker, the distribution box, and the like; the intelligent platform area fusion terminal and the ordered charging communication unit are respectively provided with an LoRa communication module; the alternating current charging pile is communicated with the Internet of vehicles in a 4G mode and is communicated with the intelligent platform area fusion terminal in a micropower LoRa mode; the intelligent integration terminal is used for collecting the total load of the distribution transformer and the charging power of each charging pile, and performing ordered charging control on each charging pile according to the total load of the distribution transformer and the charging power of each charging pile. According to the electric vehicle charging system based on the intelligent fusion terminal, orderly charging control is performed on each charging pile through the total load of the distribution transformer and the charging power of each charging pile, distribution network transformation is not needed, the cost is low, and charging is orderly and reliable.

As shown in fig. 2, this embodiment provides two kinds of communication schemes altogether, fills electric pile and communicates with the car networking through the 4G mode, and through micropower LoRa mode and platform district intelligent integration terminal communication. The platform district intelligent fusion terminal possesses built-in loRa communication module with fill electric pile respectively, does not produce the relevance with the original business in platform district.

As shown in fig. 3, the charging pile has three charging modes, namely, non-charging, high-power charging and low-power charging, corresponding to the distribution transformation load rate and the remaining power limit.

As shown in fig. 4 and 5, the present invention also discloses a charging method based on the above-mentioned electric vehicle charging system based on the intelligent integrated terminal, which includes the steps of:

acquiring total load of a distribution transformer and charging power data of all charging piles in real time through a platform area intelligent fusion terminal;

when the distribution residual power is sufficient and is larger than the set first residual power limit value, the direct charging can be carried out;

when the load of the common residents of the distribution transformer rises and the residual power is less than the set second residual power limit value, orderly charging control is carried out: sequencing and selecting according to the charging time and the charging amount, reducing the charging power of a charged charging pile, and charging the newly-accessed charging pile according to high power;

when the load of the common residents of the distribution transformer continues to rise and the residual power is less than the set third residual power limit value, the charging power of a charged charging pile is reduced, and the newly-accessed charging pile is charged according to low power, as shown in fig. 6;

when all the charging piles are adjusted and still overloaded, the charging of the charging piles is cut off in sequence according to the charging time sequence, as shown in fig. 7;

and if the residential load of the distribution area is reduced and the residual power of the distribution area is greater than the first residual power limit value, the charging power of each charging pile is increased according to the sequence of the power reduction time of the ordered charging piles.

The APP charging system comprises a power distribution cloud master station, a charging power output grade and a charging pile power access point, wherein the APP charging in order controls the start and stop of each charging pile, the charging power output grade and the quick fault isolation of the charging pile power access point in an emergency state, and the APP charging pile power access point in a real-time state is transmitted to the power distribution cloud master station, so that system-level data interaction is reduced.

In one embodiment, the low power for charging is 1-2 kW, and the high power for charging is 6-8 kW. The second residual power limit value is 80-120 kVA; the third residual power limit value is 40-60 kVA.

The above method is further illustrated below with reference to a specific, complete example:

when the alternating current charging pile is charged, the alternating current charging pile firstly needs to interact with the fusion terminal, and the fusion terminal can be controlled to charge when sending a charging command;

if the residual power of the distribution transformer is sufficient and is larger than the set first residual power limit value, the direct charging can be carried out.

When the resident load of the distribution transformer rises and the residual power is less than the set second residual power limit value (such as 100kVA), orderly charging control is carried out, and the fusion terminal reports orderly charging starting information to the master station, specifically:

s1, judging the charged alternating current piles by the fusion terminal, and reducing the charging power of the alternating current piles which are charged for more than 4 hours (can be set) from 7kW to 1.3kW so as to ensure that the charging operation is not settled and the power charging is reduced;

s2, if a new charging pile is connected, executing the step S1, adjusting a charged alternating current pile, reducing the charging power to 1.3kW, charging the newly connected charging pile according to 7kW, and giving an alarm once when one charging pile is connected;

s3, monitoring the capacity of the distribution station area in real time until the residual power of the distribution transformer is less than a set third residual power limit value (such as 50kVA), and charging the newly-accessed charging pile according to the power of 1.3 kW; the fusion terminal reports charging load alarm information of the power distribution area to the master station, and once alarm is given every time one charging pile is accessed; providing scientific basis for the capacity expansion of the transformer or the newly added special transformer for the charging pile;

s4, if the non-charging load of the transformer area continues to rise and the residual power of the distribution transformer is less than a set third residual power limit value, namely the fact that the residential load of the transformer area rises is indicated, the charging load is adjusted to 1.3kW according to the charging pile access sequence; the fusion terminal reports charging load alarm information of the power distribution area to the master station, and once alarm is given every time one charging pile is accessed;

s5, if all the charging piles are adjusted and still overloaded, sequentially cutting off the alternating current charging piles for charging according to the charging time sequence; the fusion terminal reports load alarm information of residents in the power distribution transformer area to the master station;

and S6, if the residential load of the distribution area is reduced and the residual power of the distribution area is greater than the residual power limit value, adjusting according to the sequence that the power reduction time of the orderly charging pile is the maximum, and adjusting the power to 7kW for charging.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.