A charging pile power supply method and control system applicable to highway service areas

Abstract

The present invention discloses a charging pile power supply method and control system applicable to highway service areas. This power supply method enables each charging pile to select one from multiple power supply and distribution networks for power intake. The power supply method includes: based on the charging request of the charging pile, obtaining the charging power required by the charging pile; collecting the power of the distribution transformers corresponding to each power supply and distribution network to obtain the remaining values of the power supply capacity of each distribution transformer; and based on the charging power required by the charging pile and the remaining values of the power supply capacity of each distribution transformer, selecting the optimal power supply and distribution network to supply power to the charging pile. The present invention solves the problem that the capacity on one side of the highway service area does not meet the charging demand, while there is remaining capacity in the distribution transformer on the other side but mutual assistance cannot be provided, reduces the expansion pressure of the service area power grid, and improves the charging capacity and the utilization rate of power supply and distribution assets in the highway service area.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent transportation power supply and distribution, and particularly relates to a charging pile power supply method and control system applicable to highway service areas. Background Art

[0002] Under the background of carbon peaking and carbon neutrality, traffic electrification has been recognized as an important carbon reduction action route in the transportation field. The rapid growth of electric vehicles and the lag in the construction of the distribution network have brought great pressure to the charging service capacity of highway service areas. Highway service areas are usually set up in pairs on both sides of the road and are supplied by different multi-distribution transformers respectively. Due to the limitation of the capacity of each side's distribution transformer, when the sum of the charging powers of electric vehicles on one side of the service area exceeds the power supply capacity of the transformer on this side, there will be a phenomenon that some electric vehicles cannot be charged in time, causing range anxiety for electric vehicle owners during high-speed driving and having a serious negative impact on the charging service capacity of this side's service area. However, at the same time, there may be available remaining power supply capacity on the opposite side of the service area, but it cannot be transferred to this side for mutual use, which not only wastes the grid power distribution resources but also increases the grid expansion pressure. Summary of the Invention

[0003] Aiming at the technical problems that power mutual aid cannot be achieved between the distribution transformers on each side of the highway service area and the growing demand for electric vehicle charging power cannot be met, the present invention provides a charging pile power supply method and system applicable to highway service areas, aiming to achieve power mutual aid between transformers on each side, improve the charging service level, increase the utilization rate of existing power distribution assets, and relieve the grid expansion pressure.

[0004] The present invention adopts the following technical solutions:

[0005] A charging pile power supply method applicable to highway service areas, for each charging pile in the target service area, based on the fact that each power supply and distribution network in the target service area supplies power to each charging pile it contains through its corresponding distribution transformer, and each charging pile is simultaneously connected to the output end of the distribution transformer corresponding to other power supply and distribution networks respectively, the following steps are executed:

[0006] Step 1: Based on the charging request of the charging pile, obtain the charging power required by the charging pile;

[0007] Step 2: Collect the power of the distribution transformers corresponding to each power supply and distribution network to obtain the remaining values of the power supply capacity of each distribution transformer;

[0008] Step 3: Based on the charging power required by the charging pile and the remaining values of the power supply capacity of each distribution transformer, select the best power supply and distribution network to supply power to the charging pile.

[0009] As a preferred technical solution of the present invention, in step 3, based on the charging power required by the charging pile and the remaining values of the power supply capacity of each distribution transformer, the following steps are used to select the optimal power supply and distribution network to supply power to the charging pile:

[0010] Step 3.1: Based on the charging power required by the charging pile and the remaining values of the power supply capacity of each distribution transformer, determine whether the distribution transformer of the power supply and distribution network where the charging pile is located meets the charging requirements of the charging pile. If the remaining value of the power supply capacity of the distribution transformer of the power supply and distribution network where the charging pile is located is not less than the charging power required by the charging pile, the charging requirements are met, and the power supply and distribution network where the charging pile is located is selected to supply power to the charging pile; if the remaining value of the power supply capacity of the distribution transformer of the power supply and distribution network where the charging pile is located is less than the charging power required by the charging pile, the charging requirements are not met, and step 3.2 is executed;

[0011] Step 3.2: Determine whether the distribution transformers of the remaining power supply and distribution networks meet the charging requirements. If there is at least one distribution transformer of the power supply and distribution network whose remaining value of the power supply capacity is not less than the charging power required by the charging pile, step 3.3 is executed; if the remaining values of the power supply capacity of the distribution transformers of the remaining power supply and distribution networks are all less than the charging power required by the charging pile, the power supply and distribution network with the largest remaining value of the power supply capacity of the distribution transformer is selected to perform power-limited charging on the charging pile;

[0012] Step 3.3: If there is only one power supply and distribution network whose remaining value of the power supply capacity of the distribution transformer is not less than the charging power required by the charging pile, select this power supply and distribution network to supply power to the charging pile; if there are more than one power supply and distribution networks whose remaining values of the power supply capacity of the distribution transformer are not less than the charging power required by the charging pile, select the power supply and distribution network with the largest remaining value of the power supply capacity of the distribution transformer to charge the charging pile.

[0013] As a preferred technical solution of the present invention, the remaining value of the power supply capacity of the distribution transformer is obtained by subtracting the power of the distribution transformer from the rated power capacity of the distribution transformer.

[0014] A control system for a charging pile power supply method applicable to highway service areas includes control modules, controllable switch modules, and distribution transformer power acquisition modules respectively corresponding to each power supply and distribution network. The control modules respectively corresponding to each power supply and distribution network are connected to each other,

[0015] Based on the charging request of the charging pile, the charging pile transmits the charging power required by the charging pile to the control module corresponding to the power supply and distribution network where it is located;

[0016] Based on the mutual communication between the control modules corresponding to each power supply and distribution network, the power collection modules of the distribution transformers corresponding to each power supply and distribution network collect the power of the distribution transformers corresponding to each power supply and distribution network and transmit it to the corresponding control modules, obtaining the remaining values of the power supply capacity of each distribution transformer;

[0017] The control module corresponding to the power supply and distribution network where the charging pile is located receives the remaining values of the power supply capacity of other distribution transformers. Based on the charging power required by the charging pile and the remaining values of the power supply capacity of each distribution transformer, the best power supply and distribution network is selected through the controllable switch module corresponding to the power supply and distribution network where the charging pile is located to supply power to the charging pile.

[0018] As a preferred technical solution of the present invention, the controllable switch module includes switch units between each charging pile and the output terminals of each distribution transformer. The control module selects the power supply and distribution network to supply power to the charging pile by controlling the closing and opening of the switch units between the charging pile and the output terminals of the distribution transformer.

[0019] The beneficial effects of the present invention are as follows: The present invention provides a charging pile power supply method and control system applicable to highway service areas. The present invention can implement the bilateral power supply method for charging piles in highway service areas, and based on the measurement of real-time power of bilateral multiple distribution transformers, the calculation of remaining capacity, and the comparison with the charging power demand, it realizes a scientific operation strategy for charging piles, solves the problem of mutual capacity assistance of multiple distribution transformers on each side of the highway service area, reduces the capacity expansion pressure of the service area power grid, improves the charging service capacity and the utilization rate of power supply and distribution assets in the highway service area, and has the advantages of system reliability, low construction cost, obvious effect, and easy implementation. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the charging pile power supply control system in an embodiment of the present invention;

[0021] Figure 2 is a flowchart of the operation strategy in an embodiment of the present invention. Embodiment

[0022] The present invention will be further described below with reference to the drawings. The following embodiments can enable those skilled in the art to understand the present invention more comprehensively, but do not limit the present invention in any way.

[0023] As Figure 1 described, a control system for charging pile power supply applicable to highway service areas includes control modules, controllable switch modules, and distribution transformer power collection modules corresponding to each power supply and distribution network. The control modules corresponding to each power supply and distribution network are connected to each other,

[0024] Based on the charging request of the charging pile, the charging pile transmits the charging power required by the charging pile to the control module corresponding to the power supply and distribution network where the charging pile is located;

[0025] Based on the mutual communication between the control modules corresponding to each power supply and distribution network, the power collection module of the distribution transformer corresponding to each power supply and distribution network collects the power of the distribution transformer corresponding to each power supply and distribution network and transmits it to the corresponding control module to obtain the remaining value of the power supply capacity of each distribution transformer;

[0026] The control module corresponding to the power supply and distribution network where the charging pile is located receives the remaining values of the power supply capacity of other distribution transformers. Based on the charging power required by the charging pile and the remaining values of the power supply capacity of each distribution transformer, the controllable switch module corresponding to the power supply and distribution network where the charging pile is located selects the optimal power supply and distribution network to power the charging pile.

[0027] In one embodiment, the essence of this solution is that the power supply of the charging pile can be selected to any power supply and distribution network through a controllable switch, thereby realizing multi-channel power supply of the charging pile; the power supply selection of the charging pile is realized by a dedicated controller according to the operation strategy control. The controllable switch module includes a switch unit between each charging pile and the output end of each distribution transformer. The control module selects the power supply and distribution network to power the charging pile by controlling the closing and opening of the switch unit between the charging pile and the output end of the distribution transformer. The control module adopts a dedicated controller with a charging pile power supply method. The dedicated controller can exist independently or as a module in other control systems of the service area; the controllable switch is a circuit breaker or a power electronic switch with an electric operating mechanism. When the charging pile selects a power supply network, the controller controls the switch between the charging pile and the distribution transformer corresponding to the power supply network to close, so that the circuit is conductive; the distribution transformer power acquisition module can use a corresponding sensor.

[0028] Based on the aforementioned control system, this solution also designs a charging pile power supply method suitable for highway service areas. Specifically, the controller includes an operating strategy. For each charging pile in the target service area, the controller executes the following steps based on the fact that each power supply and distribution network in the target service area supplies power to each charging pile through its corresponding distribution transformer, and each charging pile is simultaneously connected to the output of the distribution transformer corresponding to another power supply and distribution network:

[0029] Step 1: Based on the charging request of the charging pile, the charging power required by the charging pile is obtained; the controller obtains the charging power required by the charging pile;

[0030] Step 2: Collect the power of the distribution transformers corresponding to each power supply and distribution network to obtain the remaining values of the power supply capacity of each distribution transformer; the remaining value of the power supply capacity of the distribution transformer is obtained by subtracting the power of the distribution transformer from the rated power capacity of the distribution transformer; the controller subtracts the measured power value in real time from the rated capacity of the transformer to obtain the remaining value of the power supply capacity.

[0031] Step 3: Based on the charging power required by the charging pile and the remaining values of the power supply capacity of each distribution transformer, select the best power supply and distribution network to supply power to the charging pile.

[0032] In Step 3, based on the charging power required by the charging pile and the remaining values of the power supply capacity of each distribution transformer, select the best power supply and distribution network to supply power to the charging pile through the following steps:

[0033] Step 3.1: Based on the charging power required by the charging pile and the remaining values of the power supply capacity of each distribution transformer, determine whether the distribution transformer of the power supply and distribution network where the charging pile is located meets the charging requirements of the charging pile. If the remaining value of the power supply capacity of the distribution transformer of the power supply and distribution network where the charging pile is located is not less than the charging power required by the charging pile, it meets the charging requirements, and select the power supply and distribution network where the charging pile is located to supply power to the charging pile; if the remaining value of the power supply capacity of the distribution transformer of the power supply and distribution network where the charging pile is located is less than the charging power required by the charging pile, it does not meet the charging requirements, and execute Step 3.2;

[0034] Step 3.2: Determine whether the distribution transformers of the remaining power supply and distribution networks meet the charging requirements. If there is at least one distribution transformer of the power supply and distribution network whose remaining value of the power supply capacity is not less than the charging power required by the charging pile, execute Step 3.3; if the remaining values of the power supply capacity of the distribution transformers of the remaining power supply and distribution networks are all less than the charging power required by the charging pile, select the power supply and distribution network with the largest remaining value of the power supply capacity of the distribution transformer to perform power-limited charging on the charging pile; that is, take the remaining power supply as the charging power. The controller switches the charging pile limit to the power-limited charging mode through communication;

[0035] Step 3.3: If there is only one power supply and distribution network whose remaining value of the power supply capacity of the distribution transformer is not less than the charging power required by the charging pile, select this power supply and distribution network to supply power to the charging pile; if there are more than one power supply and distribution networks whose remaining values of the power supply capacity of the distribution transformer are not less than the charging power required by the charging pile, select the power supply and distribution network with the largest remaining value of the power supply capacity of the distribution transformer to charge the charging pile.

[0036] In another embodiment, as Figure 1 shown, for the distribution transformers corresponding to two large power grids on both sides (A and B sides) of the highway service area, the charging pile power supply method is as Figure 2As shown, based on the mutual extension of the power supply and distribution networks on both sides, the charging pile can select to obtain power from one of the power supply and distribution networks on both sides through a controllable switch. The controllable switch is controlled by a dedicated controller according to the relationship between the charging power demand of the charging pile and the remaining power capacity of the distribution transformers on both sides according to a preset operation strategy. The operation strategy, that is, the power supply method steps are as follows:

[0037] Step a: Based on the charging request of the charging pile, obtain the charging power required by the charging pile; collect the power of the distribution transformers corresponding to each power supply and distribution network, and obtain the remaining values of the power supply capacity of each distribution transformer;

[0038] Step b: Judge whether the remaining capacity on this side meets the charging demand. If it meets, the charging pile preferentially switches to the power supply network on this side for charging, that is, the charging pile is powered by closing the corresponding controllable switch based on the distribution transformer corresponding to the network on its side; when the remaining capacity on this side is insufficient, judge whether the remaining capacity on the opposite side meets the charging demand. If it meets, the charging pile switches to the power supply network on the opposite side for charging, that is, the charging pile is powered by closing the corresponding controllable switch based on the distribution transformer corresponding to the network on its opposite side;

[0039] Step c: When the remaining capacities on both this side and the opposite side do not meet the charging demand, compare the sizes of the remaining capacities on both sides, and switch the charging pile to the power supply network on the side with the larger remaining capacity for power-limited charging by closing the corresponding controllable switch.

[0040] The present invention designs a power supply method and control system for charging piles applicable to highway service areas. The present invention can implement the bilateral power supply method for charging piles in highway service areas, and based on the measurement of the real-time power of multiple distribution transformers on both sides, the calculation of the remaining capacity, and the comparison with the charging power demand, realizes a scientific operation strategy for charging piles, solves the problem of mutual capacity support of multiple distribution transformers on both sides of the highway service area, reduces the capacity expansion pressure of the service area power grid, improves the charging service capacity and the utilization rate of power supply and distribution assets in the highway service area, and has the advantages of system reliability, low construction cost, obvious effect, easy implementation, etc.

[0041] The above is only the preferred embodiment of the present invention, but it does not limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. Any equivalent structures directly or indirectly using the content of the specification and drawings of the present invention in other related technical fields are equally within the scope of the patent protection of the present invention.

Claims

1. A charging pile power supply method suitable for highway service areas, characterized in that: For each charging pile in the two power supply and distribution networks on either side of the highway service area, each power supply and distribution network supplies power to each charging pile through its corresponding distribution transformer, and each charging pile is simultaneously connected to the output terminal of the distribution transformer corresponding to the other power supply and distribution network. The charging pile uses a controllable switch to select one of the two power supply and distribution networks to draw power. The controllable switch is controlled by a dedicated controller according to a preset operating strategy based on the relationship between the charging power demand of the charging pile and the remaining power capacity of the distribution transformer on each side. Perform the following steps: Step 1: Based on the charging request of the charging pile, obtain the charging power required by the charging pile; Step 2: Collect the power of the distribution transformers corresponding to each power supply and distribution network to obtain the remaining power capacity of each distribution transformer; Step 3: Based on the required charging power of the charging pile and the remaining power capacity of each distribution transformer, select the best power distribution network to power the charging pile through the following steps: Step 3.1: Based on the charging power required by the charging pile and the remaining power capacity of each distribution transformer, determine whether the distribution transformer of the power distribution network where the charging pile is located meets the charging requirements of the charging pile. If the remaining power capacity of the distribution transformer of the power distribution network where the charging pile is located is not less than the charging power required by the charging pile, the charging requirements are met, and the power distribution network where the charging pile is located is selected to supply power to the charging pile. If the remaining power capacity of the distribution transformer of the power distribution network where the charging pile is located is less than the charging power required by the charging pile, the charging requirements are not met, and step 3.2 is executed. Step 3.2: Determine whether the distribution transformers of the remaining power distribution networks meet the charging requirements. If at least one of the distribution transformers of the power distribution network has a remaining power capacity that is not less than the charging power required by the charging pile, proceed to step 3.

3. If the remaining power capacity values of the distribution transformers of the remaining power distribution networks are all less than the charging power required by the charging pile, select the power distribution network with the largest remaining power capacity value of the distribution transformer to charge the charging pile with limited power. Step 3.3: If there is only one distribution network whose distribution transformer's remaining power capacity is not less than the charging power required by the charging pile, then that distribution network is selected to supply power to the charging pile. If there is more than one distribution network whose distribution transformer's remaining power capacity is not less than the charging power required by the charging pile, then the distribution network with the largest remaining power capacity is selected to charge the charging pile.

2. A charging pile power supply method suitable for highway service areas according to claim 1, characterized in that: The remaining value of the power supply capacity of the distribution transformer is obtained by subtracting the power of the distribution transformer from the rated power capacity of the distribution transformer.

3. A control system based on the charging pile power supply method applicable to highway service areas according to claim 1 or 2, characterized in that: It includes control modules, controllable switch modules, and distribution transformer power acquisition modules corresponding to each power supply and distribution network. The control modules corresponding to each power supply and distribution network are interconnected. Based on the charging request of the charging pile, the charging pile transmits the charging power required by the charging pile to the control module corresponding to the power supply and distribution network where the charging pile is located; Based on the mutual communication between the control modules corresponding to each power supply and distribution network, the power collection module of the distribution transformer corresponding to each power supply and distribution network collects the power of the distribution transformer corresponding to each power supply and distribution network and transmits it to the corresponding control module to obtain the remaining value of the power supply capacity of each distribution transformer; The control module corresponding to the power supply and distribution network where the charging pile is located receives the remaining values of the power supply capacity of other distribution transformers. Based on the charging power required by the charging pile and the remaining values of the power supply capacity of each distribution transformer, the controllable switch module corresponding to the power supply and distribution network where the charging pile is located selects the optimal power supply and distribution network to power the charging pile.

4. A control system for a charging pile power supply method suitable for a highway service area according to claim 3, characterized in that: The controllable switch module includes a switch unit between each charging pile and the output end of each distribution transformer. The control module controls the closing and opening of the switch unit between the charging pile and the output end of the distribution transformer to select the distribution network to power the charging pile.

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