Load power control system and method for new energy charging pile

Abstract

The invention discloses a load power control system and method for a new energy charging pile, and the system comprises a transformer power monitoring unit, a judgment unit and an execution unit which are electrically connected in sequence, and the transformer power monitoring unit is electrically connected to a distribution transformer which supplies power to the charging pile. Monitoring the output power of the distribution transformer in real time; the judgment unit compares and judges the output power with the rated power of the distribution transformer, outputs a judgment result and sends a control instruction to the execution unit; and the execution unit executes the judgment result, turns on or turns off the power supply of the charging pile according to the control instruction, or selectively performs grouping and / or time-sharing turning on or off of the power supply of the charging pile. The method is applied to the system. The load power of the transformer is monitored and compared with the rated power of the transformer, the power supply of the charging pile loop is cut off before overload, the load power of the transformer is reduced, and electricity utilization safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of intelligent charging technology for charging piles, and in particular to a load power control system and method for new energy charging piles. Background Technology

[0002] Currently, the sales of new energy electric vehicles are increasing exponentially year by year, and the demand for installing home charging stations in residential communities is growing rapidly. However, many older residential communities often find it difficult to install charging stations due to limitations in transformer capacity.

[0003] Current technologies typically achieve charging power adjustment and control through communication with charging piles. This communication is feasible in centralized fast-charging setups, as the piles are generally from the same manufacturer and are located close to each other. However, for residential slow-charging, communication is practically impossible. This is because slow-charging data is generally uploaded only to the manufacturer's own cloud platform, without a dedicated communication interface. Even if the charging pile has a host computer communication interface, the interface types (4G, Ethernet, RS-485, CAN, etc.) of hundreds of charging piles from different manufacturers within a community are inconsistent, and their communication protocols are incompatible. Furthermore, new manufacturers and models of charging piles may be added later, making implementation extremely difficult and hindering communication. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is: how to adjust and control the charging power of charging piles in residential communities.

[0005] To address the aforementioned technical problems, this invention provides a load power control system for new energy charging piles, comprising, in sequence, a transformer power monitoring unit, a judgment unit, and an execution unit, wherein the transformer power monitoring unit is electrically connected to the distribution transformer supplying power to the charging pile and monitors the output power of the distribution transformer in real time; the judgment unit compares and judges the output power with the rated power of the distribution transformer, outputs the judgment result, and sends a control command to the execution unit; the execution unit executes the judgment result and turns the power supply of the charging pile on or off according to the control command.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Preferably, the judgment unit compares the output power with the rated power of the distribution transformer and calculates the load factor, wherein the load factor = output power of the distribution transformer / rated power of the distribution transformer, and the judgment is made based on whether the load factor does not exceed a set value.

[0008] Preferably, the set value is 0.9-1.

[0009] Preferably, the execution unit selectively groups and / or turns on or off the power supply of the charging pile in a time-sharing manner.

[0010] Preferably, the judgment unit is a PLC, a microcontroller, an edge computing module, or a cloud platform programming module.

[0011] Preferably, the execution unit is one of the following: an electrical accessory combination consisting of a contactor and an outgoing switch connected in series, a PLC output relay control switch, or a contactor that communicates and controls with distributed I / O.

[0012] Preferably, the judgment unit is connected to the execution unit via hardwired connection or wireless communication module, or the judgment unit wirelessly communicates to an IO module with output function, and then communicates with the execution unit via the IO module.

[0013] Preferably, the transformer power monitoring unit is a PLC AC sampling module or a multi-functional power meter.

[0014] Based on this, the present invention provides a load power control method for new energy charging piles. The method is applied to the load power control system of the aforementioned new energy charging piles and includes the following steps:

[0015] Real-time monitoring of the output power of distribution transformers;

[0016] The output power is compared and judged with the rated power of the distribution transformer, the judgment result is output, and the control command is sent.

[0017] Execute the judgment result and turn the power supply of the charging pile on or off according to the control command, or selectively group and / or turn the power supply of the charging pile on or off at different times.

[0018] Preferably, the comparison involves comparing the output power with the rated power of the distribution transformer and calculating the load factor, wherein the load factor = output power of the distribution transformer / rated power of the distribution transformer; the judgment involves determining whether the load factor does not exceed a set value.

[0019] Compared with the prior art, the present invention has the following technical features:

[0020] 1. This invention monitors the load power of the transformer and compares it with the rated power of the transformer. When the load rate approaches 100% of the transformer, the power supply of the charging pile circuit is cut off to reduce the load power of the transformer and ensure electrical safety.

[0021] 2. When the transformer load rate is too high, the present invention turns on or off the power supply of the charging piles in a time-sharing and group-based manner, so as to distribute the power supply to the charging piles as evenly as possible while ensuring that the transformer is not overloaded.

[0022] 3. This invention directly controls the power supply of the charging pile by controlling the contactor, switch, or other controllable switching device that charges the charging pile. Compared with the prior art, which relies on communication with the charging pile to adjust and control the charging power, this invention is more feasible. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the load power control system for the new energy charging pile of the present invention;

[0025] Figure 2 This is a circuit connection diagram of the load power control system for the new energy charging pile of the present invention;

[0026] Figure 3 This is a flowchart illustrating the steps of the load power control method for new energy charging piles according to the present invention.

[0027] The following is a list of component names represented by the reference numerals in the attached diagram:

[0028] 10 - Transformer power monitoring unit, T1 - Transformer, Q0 - Low-voltage incoming switch, B - Busbar, Q1 - First outgoing switch, Q2 - Second outgoing switch;

[0029] 20 - Judgment unit; 30 - Execution unit; K1 - First contactor; Q3 - Third outgoing switch; K2 - Second contactor; Q4 - Fourth outgoing switch. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please refer to Figure 1As shown, it is a structural schematic diagram of the load power control system of the new energy charging pile of the present invention; the load power control system of the new energy charging pile includes, in sequence, a transformer power monitoring unit 10, a judgment unit 20 and an execution unit 30.

[0032] Specifically,

[0033] The transformer power monitoring unit 10 is electrically connected to the distribution transformer that supplies power to the charging pile. Figure 1 Not shown in the image, please refer to [link / reference]. Figure 2 ), to monitor the output power of the distribution transformer in real time.

[0034] The judgment unit 20 compares the output power of the distribution transformer monitored in real time by the transformer power monitoring unit 10 with the rated power of the distribution transformer, and calculates the load rate, where load rate = output power of the distribution transformer / rated power of the distribution transformer. Then, it determines whether the power supply of the charging pile needs to be turned on or off based on whether the load rate does not exceed a set value, outputs the judgment result, and sends a control command to the execution unit 30. For example, if the set value is 1, the power supply of the charging pile is turned off when the load rate is greater than or equal to 1, and the power supply of the charging pile is turned on when the load rate is less than 1. The judgment of the load rate can be flexibly set according to the actual situation. For example, the set value can also be set to 0.95, where the power supply of the charging pile is turned off when the load rate is greater than or equal to 0.95, and the power supply of the charging pile is turned on when the load rate is less than 0.95. Alternatively, in some older communities, the set value can be set to 0.9, but this is not a limitation.

[0035] Preferably, the judgment unit 20 can be configured to control the execution unit to selectively group and / or turn on or off the charging pile power supply, for example, cutting off the charging pile power supply in the eastern half of the community from 7 pm to 8 pm and charging in the western half of the community, cutting off the charging pile power supply in the western half of the community from 8 pm to 9 pm and charging in the eastern half of the community, etc., but not limited to this.

[0036] Optionally, the judgment unit may select to use a PLC, a microcontroller, or an edge computing module, depending on the actual situation, or it may transmit the data to a cloud platform for judgment, etc.

[0037] The execution unit 30 executes the judgment result output by the judgment unit 20, that is, it turns the power supply of the charging pile on or off according to the control command, or selectively groups and / or turns the charging pile power supply on or off at different times. In the load power control system of the new energy charging pile of the present invention, the execution unit can control a total charging pile power supply, or distribute and control several charging pile branch power supplies, or control the power supply of each charging pile, depending on the site conditions. The finer the control, the better the effect, but also the higher the cost. For the slow charging circuit of a home car charging pile, a short power outage basically does not affect the use; and for most users, they do not need to charge all night every day, so grouping / time-sharing charging is a good solution.

[0038] The load power control system for new energy charging piles of the present invention can be applied not only to older residential communities, but also to units with limited transformer capacity, public parking lots, etc., to play a safety role and avoid sudden power outages caused by transformer overload.

[0039] Next, please refer to Figure 2 The diagram shows the circuit connection of the load power control system of the new energy charging pile of the present invention. In a residential area, the output terminal of transformer T1 is electrically connected to bus B through low-voltage incoming switch Q0 for power supply. Residential electricity is drawn from the bus through first outgoing switch Q1 and second outgoing switch Q2, while the new energy vehicle charging pile draws power from the bus through first contactor K1 and third outgoing switch Q3 connected in series, or second contactor K2 and fourth outgoing switch Q4, etc.

[0040] In the load power control system of the new energy charging pile of the present invention, the transformer power monitoring unit 10 is electrically connected to the low-voltage incoming switch Q0, thereby performing real-time monitoring of the output power of transformer T1; the judgment unit 20 compares the output power of transformer T1 with its rated power, and then determines whether the power supply of the charging pile needs to be turned on or off, and sends a control command to the execution unit 30; the execution unit 30 includes a contactor and an outgoing switch connected in series, that is, the execution unit 30 is an electrical component combination consisting of a contactor and an outgoing switch connected in series; thus, the execution unit 30 can perform the operation of turning the power supply of the charging pile on or off.

[0041] In the load power control system of the new energy charging pile of the present invention, the judgment unit can control the execution unit through hard wiring, or it can be controlled through a wireless communication module. Alternatively, the judgment unit can wirelessly communicate with an IO module with output function, and then connect to a relay, contactor or other switching circuit device through the IO module to execute the output.

[0042] In the load power control system of the new energy charging pile of the present invention, the number of execution units 30 is one or more. Those skilled in the art can comprehensively consider factors such as the number and location of charging piles in the residential area to plan the number and location of execution units; for example, one execution unit can be set for each building, or one execution unit can be set for each unit, etc.

[0043] Optionally, in the load power control system of the new energy charging pile of the present invention, the transformer power monitoring unit 10 is selected as a PLC AC sampling module, the judgment unit 20 is selected as a PLC programming module, and the execution unit 30 is selected as a PLC output relay control switch.

[0044] Alternatively, in the load power control system of the new energy charging pile of the present invention, the transformer power monitoring unit 10 is a multi-functional power meter, the judgment unit 20 is a single-chip microcomputer programming module, and the execution unit 30 is a contactor that communicates and controls with distributed IO.

[0045] Alternatively, in the load power control system of the new energy charging pile of the present invention, the transformer power monitoring unit 10 is a multi-functional power meter, the judgment unit 20 is a cloud platform programming module, and the data monitored by the transformer power monitoring unit 10 is uploaded to the cloud platform through the gateway in the form of 4G / LAN / WIFI / LORA / NB-IOT, etc., and the execution unit 30 is a remote switch controlled by the gateway communication.

[0046] Based on this, the present invention also provides a load power control method for new energy charging piles, please refer to... Figure 3 The above is a flowchart illustrating the steps of the load power control method for new energy charging piles according to the present invention. The method is applied to the load power control system of the aforementioned new energy charging piles. Specifically, the load power control method for new energy charging piles includes the following steps:

[0047] S1: Real-time monitoring of the output power of the distribution transformer;

[0048] S2: Compare the monitored output power with the rated power of the distribution transformer, calculate the load rate, wherein the load rate = output power of the distribution transformer / rated power of the distribution transformer, and then determine whether the power supply of the charging pile needs to be turned on or off based on whether the load rate does not exceed the set value, output the judgment result, and send control commands.

[0049] Optionally, when the load rate is greater than or equal to 1, the power supply of the charging pile is turned off; when the load rate is less than 1, the power supply of the charging pile is turned on.

[0050] Alternatively, when the load rate is greater than or equal to 0.95, the power supply of the charging pile shall be turned off, and when the load rate is less than 0.95, the power supply of the charging pile shall be turned on.

[0051] S3: Execute the judgment result and turn the power supply of the charging pile on or off according to the control command, or selectively group and / or turn the power supply of the charging pile on or off in a time-sharing manner.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A load power control system for a new energy charging pile, characterized in that, It includes, in sequence, a transformer power monitoring unit, a judgment unit, and an execution unit, which are electrically connected. The transformer power monitoring unit is electrically connected to the distribution transformer that supplies power to the charging pile, and monitors the output power of the distribution transformer in real time. The judgment unit compares and judges the output power and the rated power of the distribution transformer, outputs the judgment result, and sends a control command to the execution unit. The execution unit executes the judgment result and turns the power supply of the charging pile on or off according to the control command.

2. The load power control system for new energy charging piles according to claim 1, characterized in that, The judgment unit compares the output power with the rated power of the distribution transformer and calculates the load factor, which is calculated as: output power of distribution transformer / rated power of distribution transformer. The judgment is made based on whether the load factor does not exceed a set value.

3. The load power control system for new energy charging piles according to claim 2, characterized in that, The set value is 0.9-1.

4. The load power control system for new energy charging piles according to any one of claims 1 to 3, characterized in that, The execution unit selectively groups and / or turns on or off the power supply of the charging piles in a time-sharing manner.

5. The load power control system for new energy charging piles according to any one of claims 1 to 3, characterized in that, The judgment unit is a PLC, a microcontroller, an edge computing module, or a cloud platform programming module.

6. The load power control system for new energy charging piles according to any one of claims 1 to 3, characterized in that, The execution unit is one of the following: an electrical accessory combination consisting of a contactor and an outgoing switch connected in series, a PLC output relay control switch, or a contactor that communicates and controls with distributed I / O.

7. The load power control system for new energy charging piles according to any one of claims 1 to 3, characterized in that, The judgment unit communicates with the execution unit via hard-wired or wireless communication module, or the judgment unit communicates wirelessly to an IO module with output function, and then communicates with the execution unit via the IO module.

8. The load power control system for new energy charging piles according to any one of claims 1 to 3, characterized in that, The transformer power monitoring unit is a PLC AC sampling module or a multi-functional power meter.

9. A load power control method for a new energy charging pile, characterized in that, The load power control system for the new energy charging pile according to any one of claims 1 to 8, the method comprises the following steps: Real-time monitoring of the output power of distribution transformers; The output power is compared and judged with the rated power of the distribution transformer, the judgment result is output, and the control command is sent. Execute the judgment result and turn the power supply of the charging pile on or off according to the control command, or selectively group and / or turn the power supply of the charging pile on or off at different times.

10. The load power control method for new energy charging piles according to claim 9, characterized in that, The comparison involves comparing the output power with the rated power of the distribution transformer, and calculating the load factor, where the load factor = output power of the distribution transformer / rated power of the distribution transformer; the judgment involves determining whether the load factor does not exceed a set value.

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