A method, system, and medium for orderly charging scheduling of electric vehicles based on power nodes.

Abstract

This application discloses a method, system, and medium for orderly charging scheduling of electric vehicles based on power nodes, relating to the fields of smart grid and charging facility management technology. The method includes: obtaining the real-time total load power of a substation, calculating the real-time load margin of the substation, and when a charging device requests to connect for charging, determining the target power of a first target charging device based on the real-time load margin of the substation and the requested access power of the charging device; when no charging device requests to connect for charging, but the real-time load margin of the substation is greater than or equal to a set threshold, and a charging device is in a power derating state, determining the target power of a second target charging device based on the real-time load margin of the substation, and subsequently issuing power scheduling instructions to complete orderly charging scheduling. This application can efficiently meet the growing charging demand while ensuring grid security.

Description

Technical Field

[0001] This application relates to the field of smart grid and charging facility management technology, and in particular to a method, system and medium for orderly charging scheduling of electric vehicles based on power nodes. Background Technology

[0002] With the increasing popularity of electric vehicles, the demand for charging has grown dramatically. However, the grid capacity is usually limited, and disorderly charging can easily lead to local grid overload, causing problems such as power outages, damage to charging equipment, and even grid instability.

[0003] Currently, most existing orderly charging scheduling (also known as orderly charging management) schemes rely solely on simple time-of-use pricing to guide user behavior or on simple start-stop control through priority ranking. They lack comprehensive consideration of real-time grid load and vehicle power demand, as well as dynamic and refined power regulation capabilities. Furthermore, without orderly charging scheduling, simply relying on grid expansion is not only costly but also insufficient to quickly respond to the ever-increasing charging demand. Therefore, there is an urgent need for a method that can achieve safe, efficient, and intelligent orderly charging scheduling within limited grid capacity. Summary of the Invention

[0004] The purpose of this application is to provide a method, system, and medium for orderly charging scheduling of electric vehicles based on power nodes, which can efficiently meet the growing charging demand while ensuring grid security.

[0005] To achieve the above objectives, this application provides the following solution.

[0006] In a first aspect, this application provides a method for orderly charging scheduling of electric vehicles based on power nodes, the method comprising: The real-time total load power of the sub-area is obtained, and the real-time load margin of the sub-area is calculated based on the node capacity limit and the real-time total load power of the sub-area; the sub-area is the area that needs to be scheduled for orderly charging of electric vehicles. When a charging device requests to connect for charging, the target power of the first target charging device is determined based on the real-time load margin of the substation area and the requested access power of the charging device. A power scheduling instruction is then issued to the first target charging device so that the actual power of the first target charging device is the target power. The first target charging device includes the charging device requesting to connect for charging and the charging device in the charging state. The charging device is used to charge electric vehicles. When no charging device requests access to charging, but the real-time load margin of the substation area is greater than or equal to the set threshold, and a charging device is in a power derating state, the target power of the second target charging device is determined based on the real-time load margin of the substation area, and a power scheduling command is issued to the second target charging device so that the actual power of the second target charging device is the target power; the power derating state is when the actual power of the charging device is less than the required power, and the second target charging device is a charging device in a charging state.

[0007] Optionally, based on the real-time load margin of the substation area and the requested access power of the charging equipment requesting access, the target power of the first target charging equipment is determined, specifically including: Determine whether the requested access power of the charging device is less than or equal to the real-time load margin of the substation area to obtain the first judgment result; If the first judgment result is yes, then the target power of the charging device requesting access to charging is determined as the requested access power, and the target power of the charging device in the charging state is determined as the actual power, so as to determine the target power of the first target charging device. If the first judgment result is negative, the product of the requested access power and the first preset ratio is calculated to obtain the lower limit of the rechargeable power. It is then determined whether the lower limit of the rechargeable power is less than or equal to the real-time load margin to obtain the second judgment result. If the second judgment result is yes, then the target power of the charging device requesting access to charging is determined to be the real-time load margin, and the target power of the charging device in the charging state is determined to be the actual power, so as to determine the target power of the first target charging device. If the second judgment result is negative, calculate the total power reduction margin of the charging device in the charging state, determine whether the lower limit of the charging power is greater than the total power reduction margin, and obtain the third judgment result. If the third judgment result is yes, then the target power of the charging device requesting access to charging is determined to be 0, and the target power of the charging device in the charging state is determined to be the actual power, so as to determine the target power of the first target charging device. If the third judgment result is negative, then calculate the power derating factor of the charging device in the charging state, calculate the product of the actual power of the charging device in the charging state and the power derating factor, obtain the drated power of the charging device in the charging state, determine the target power of the charging device requesting access to charging as the lower limit of the rechargeable power, determine the target power of the charging device in the charging state as the drated power, and determine the target power of the first target charging device.

[0008] Optionally, the charging device in the charging state includes both DC charging devices and AC charging devices in the charging state. In this case, the power derating factor of the charging device in the charging state is calculated, specifically including: Calculate the total DC power slashing margin of a DC charging device in the charging state, and calculate the total AC power slashing margin of an AC charging device in the charging state; the sum of the total DC power slashing margin and the total AC power slashing margin is the total power slashing margin. Determine whether the lower limit of rechargeable power is less than or equal to the total DC scalable power margin; If so, calculate the sum of the actual power of the DC charging device in the charging state to obtain the sum of the actual DC power. Based on the real-time load margin, the lower limit of the rechargeable power and the sum of the actual DC power, calculate the power derating factor of the DC charging device in the charging state. Take 1 as the power derating factor of the AC charging device in the charging state to calculate the power derating factor of the charging device in the charging state. If not, then based on the actual power and rated power of the DC charging device in the charging state, the power derating factor of the DC charging device in the charging state is calculated, the sum of the actual power of the AC charging device in the charging state is calculated, and the sum of the actual AC power is obtained. Based on the requested access power, the total DC power reduction margin, the total AC power reduction margin, and the sum of the actual AC power, the power derating factor of the AC charging device in the charging state is calculated.

[0009] Optionally, calculating the total power reduction margin of the charging devices in the charging state specifically includes: for each charging device in the charging state, calculating the product of the rated power of the charging device in the charging state and the second preset ratio to obtain the lower limit of the power of the charging device in the charging state; calculating the difference between the actual power of the charging device in the charging state and the lower limit of the power to obtain the power reduction margin of the charging device in the charging state; and calculating the sum of the power reduction margins of each charging device in the charging state to obtain the total power reduction margin of the charging devices in the charging state. The calculation of the total DC power reduction margin for DC charging devices in the charging state specifically includes: for each DC charging device in the charging state, calculating the product of the rated power of the DC charging device in the charging state and the second preset ratio to obtain the lower limit of the power of the DC charging device in the charging state; calculating the difference between the actual power of the DC charging device in the charging state and the lower limit of the power to obtain the power reduction margin of the DC charging device in the charging state; and calculating the sum of the power reduction margins of each DC charging device in the charging state to obtain the total DC power reduction margin of the DC charging devices in the charging state. The calculation of the total AC power reduction margin for AC charging devices in charging state includes: for each AC charging device in charging state, calculating the product of the rated power of the AC charging device in charging state and the second preset ratio to obtain the lower limit of the power of the AC charging device in charging state; calculating the difference between the actual power of the AC charging device in charging state and the lower limit of the power to obtain the power reduction margin of the AC charging device in charging state; and calculating the sum of the power reduction margins of each AC charging device in charging state to obtain the total AC power reduction margin of the AC charging devices in charging state.

[0010] Optionally, based on the real-time load margin, the lower limit of rechargeable power, and the sum of actual DC power, the power derating factor of the DC charging device in the charging state is calculated. Specifically, this includes: calculating the sum of the real-time load margin and the sum of actual DC power to obtain a first sum; calculating the difference between the first sum and the lower limit of rechargeable power to obtain a first difference; and calculating the ratio of the first difference to the sum of actual DC power to obtain the power derating factor of the DC charging device in the charging state. Based on the actual power and rated power of the DC charging device in the charging state, the power derating factor of the DC charging device in the charging state is calculated. Specifically, for each DC charging device in the charging state, the rated power of the DC charging device in the charging state is calculated as the product of the rated power of the DC charging device in the charging state and the second preset ratio to obtain the lower limit of the power of the DC charging device in the charging state. The ratio of the lower limit of the power of the DC charging device in the charging state to the actual power is calculated to obtain the power derating factor of the DC charging device in the charging state. Based on the requested access power, the total DC power reduction margin, the total AC power reduction margin, and the actual AC power, the power derating factor of the AC charging device in the charging state is calculated. Specifically, this includes: calculating the sum of the total AC power reduction margin and the actual AC power to obtain a second sum; calculating the difference between the requested access power and the total DC power reduction margin to obtain a second difference; calculating the sum of the second difference and the actual AC power to obtain a third sum; and calculating the ratio of the second sum to the third sum to obtain the power derating factor of the AC charging device in the charging state.

[0011] Optionally, the target power of the second target charging device is determined based on the real-time load margin of the substation area, specifically including: Calculate the sum of the power demand differences of charging devices in the charging state to obtain the total power demand difference; the power demand difference is the difference between the demanded power and the actual power. Determine whether the real-time load margin is greater than or equal to the total difference in demand power. If so, then the target power of the second target charging device is determined to be the required power; If not, calculate the power enhancement coefficient of the second target charging device, calculate the product of the actual power of the second target charging device and the power enhancement coefficient, obtain the enhanced power of the second target charging device, and determine the target power of the second target charging device as the enhanced power.

[0012] Optionally, the charging devices in the charging state include DC charging devices and AC charging devices in the charging state. In this case, the power enhancement coefficient of the second target charging device is calculated, specifically including: Calculate the sum of the power demand differences of DC charging devices in the charging state to obtain the total DC power demand difference; calculate the sum of the power demand differences of AC charging devices in the charging state to obtain the total AC power demand difference; the sum of the total DC power demand difference and the total AC power demand difference is the total power demand difference. Determine whether the real-time load margin is less than the total difference in AC power demand. If so, calculate the sum of the actual power of the AC charging equipment in the charging state, obtain the sum of the actual AC power, and calculate the power enhancement coefficient of the AC charging equipment in the charging state based on the real-time load margin and the sum of the actual AC power. Take 1 as the power enhancement coefficient of the DC charging equipment in the charging state to calculate the power enhancement coefficient of the charging equipment in the charging state. If not, then based on the actual power and demand power of the AC charging equipment in the charging state, the power enhancement coefficient of the AC charging equipment in the charging state is calculated, the sum of the actual power of the DC charging equipment in the charging state is calculated, and the sum of the actual DC power is obtained. Based on the real-time load margin, the total difference of AC demand power and the sum of the actual DC power, the power enhancement coefficient of the DC charging equipment in the charging state is calculated, so as to calculate the power enhancement coefficient of the charging equipment in the charging state.

[0013] Optionally, based on the real-time load margin and the sum of the actual AC power, the power enhancement coefficient of the AC charging device in the charging state is calculated, specifically including: calculating the sum of the real-time load margin and the sum of the actual AC power to obtain a fourth sum, calculating the ratio of the fourth sum to the sum of the actual AC power to obtain the power enhancement coefficient of the AC charging device in the charging state. Based on the actual power and demand power of the AC charging device in the charging state, the power enhancement coefficient of the AC charging device in the charging state is calculated. Specifically, for each AC charging device in the charging state, the ratio of the demand power to the actual power of the AC charging device in the charging state is calculated to obtain the power enhancement coefficient of the AC charging device in the charging state. Based on the real-time load margin, the total difference in AC power demand, and the sum of actual DC power, the power enhancement coefficient of the DC charging equipment in the charging state is calculated. Specifically, this includes: calculating the difference between the real-time load margin and the total difference in AC power demand to obtain the third difference; calculating the sum of the third difference and the sum of actual DC power to obtain the fifth sum; and calculating the ratio of the fifth sum to the sum of actual DC power to obtain the power enhancement coefficient of the DC charging equipment in the charging state.

[0014] Secondly, this application provides an electric vehicle orderly charging scheduling system based on power nodes, the system comprising: an energy routing unit and a scheduling platform; The energy routing unit is used to collect the real-time total load power of the substation area; The scheduling platform is communicatively connected to the energy routing unit; the scheduling platform is used to execute the above-mentioned power node-based orderly charging scheduling method for electric vehicles.

[0015] Thirdly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described power node-based ordered charging scheduling method for electric vehicles.

[0016] According to the specific embodiments provided in this application, this application has the following technical effects.

[0017] This application provides a method, system, and medium for orderly charging scheduling of electric vehicles based on power nodes. It obtains the real-time total load power of a sub-station and calculates the real-time load margin of the sub-station based on the node capacity limit and the real-time total load power. When a charging device requests to connect for charging, it determines the target power of a first target charging device based on the real-time load margin of the sub-station and the requested access power of the requesting charging device. A power scheduling command is then issued to the first target charging device, ensuring that the actual power of the first target charging device is the target power. The first target charging device includes the charging device requesting to connect for charging and charging devices already in a charging state. When no charging device requests to connect, the system proceeds. If a user requests access to charging, but the real-time load margin of the substation is greater than or equal to a set threshold, and there is a charging device in a power derating state, then the target power of the second target charging device is determined based on the real-time load margin of the substation, and a power scheduling command is issued to the second target charging device, so that the actual power of the second target charging device is the target power, and the second target charging device is a charging device in a charging state. In this way, the charging power is dynamically and finely controlled by comprehensively considering the real-time grid load and the real-time power demand of the vehicle. This enables safe, efficient, and intelligent orderly charging scheduling under limited grid capacity, and can efficiently meet the ever-increasing charging demand while ensuring grid safety. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating an orderly charging scheduling method for electric vehicles based on power nodes, as provided in Embodiment 1 of this application.

[0020] Figure 2 This is a schematic diagram of the structure of the sub-platform area provided in Embodiment 1 of this application.

[0021] Figure 3 This is a schematic diagram of the power scheduling process when a charging access request exists, as provided in Embodiment 1 of this application.

[0022] Figure 4 This is a schematic diagram of the power scheduling process during power recovery provided in Embodiment 1 of this application.

[0023] Figure 5 This is a schematic diagram of the structure of a computer device provided in Embodiment 3 of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Example 1 This embodiment provides a method for orderly charging scheduling of electric vehicles based on power nodes, such as... Figure 1 As shown, the power node-based orderly charging scheduling method for electric vehicles includes the following steps S1-S3.

[0026] Step S1: Obtain the real-time total load power of the sub-station area, and calculate the real-time load margin of the sub-station area based on the node capacity limit and the real-time total load power of the sub-station area; the sub-station area is the area that needs to carry out orderly charging scheduling of electric vehicles.

[0027] Step S2: When a charging device requests to access charging, the target power of the first target charging device is determined based on the real-time load margin of the substation area and the requested access power of the charging device. A power scheduling instruction is then issued to the first target charging device so that the actual power of the first target charging device is the target power. The first target charging device includes the charging device requesting to access charging and the charging device in the charging state. The charging device is used to charge electric vehicles.

[0028] Step S3: When no charging device requests access to charge, but the real-time load margin of the substation area is greater than or equal to the set threshold, and a charging device is in a power derating state, the target power of the second target charging device is determined based on the real-time load margin of the substation area, and a power scheduling command is issued to the second target charging device so that the actual power of the second target charging device is the target power; the power derating state is when the actual power of the charging device is less than the required power, and the second target charging device is a charging device in a charging state.

[0029] By implementing steps S1-S3 above, this embodiment can achieve safe, efficient, and intelligent orderly charging scheduling under limited grid capacity, thereby efficiently meeting the growing charging demand while ensuring grid safety.

[0030] The sub-station area addressed in this embodiment will be described below.

[0031] In this embodiment, a sub-station area is used as the smallest scheduling unit. A sub-station area is an area that needs to be scheduled for orderly charging of electric vehicles. The sub-station area is bound to a charging station, and the charging equipment (such as charging piles) in the charging station is used to charge electric vehicles. When scheduling power in a sub-station area, the charging equipment within it can be adjusted. For example, a sub-station area may be a community or industrial park.

[0032] Multiple substations can be connected through a parent-child relationship. From the perspective of circuit connection, when a main circuit is used as a substation, the substations corresponding to the branches of that main circuit become the subordinate substations of that main circuit's substation. When power scheduling is performed on the substation corresponding to that main circuit, its subordinate substations are treated as loads, and the power scheduling of the charging equipment within those subordinate substations is not considered. For example... Figure 2 As shown, the transformer is used for power supply. An ERU (Energy Routing Unit) is installed at the main meter to perform power dispatching for the sub-stations corresponding to the main meter. The main meter includes three branch meters, and an ERU is installed at each branch meter to perform power dispatching for the sub-stations corresponding to the branch meter. Figure 2 The load in the meter refers to the load in the sub-station area corresponding to the branch meter, which includes charging equipment.

[0033] To achieve orderly charging scheduling, this embodiment first constructs an orderly charging scheduling system, which includes a cloud management platform (hereinafter referred to as the scheduling platform), an energy routing unit (ERU), and several charging devices. The ERU is deployed at key nodes on the power distribution side and together with the charging devices, constitutes a site unit (also known as a power node). A site unit is the smallest orderly charging scheduling site unit composed of a single ERU and all the charging devices under its management. A site unit must be bound to at least one ERU and one charging device to enable the orderly charging scheduling function. The ERU is responsible for collecting the total load power of its local power grid in real time. The charging devices include AC charging devices and DC charging devices, all of which have the ability to communicate with the scheduling platform and the ERU and receive power scheduling instructions (also known as power control instructions).

[0034] This embodiment enables hierarchical configuration, supporting a hierarchical management structure of level 1 or level 2. Each level can be configured with an ERU and perform power scheduling independently.

[0035] The components of the orderly charging scheduling system in this embodiment will be described in detail below.

[0036] (1) Scheduling Platform: Responsible for global strategy management (i.e., managing power scheduling strategies), data aggregation, user interaction (i.e., users configure node capacity upper limits and node capacity warning value percentages, and users adjust power scheduling strategies) and background scheduling (i.e., issuing power scheduling instructions to charging devices). It provides a management APP and a background management webpage for device management (i.e., issuing power scheduling instructions to charging devices, setting the upper limit, lower limit and rated power of charging devices, including voltage, current, etc.), configuring parameters (i.e., users configure node capacity upper limits and node capacity warning value percentages, and users adjust power scheduling strategies) and displaying device operating status (i.e., displaying whether the charging device is in charging state and the voltage, current, power and power of the charging device). The scheduling platform issues charging power limits to each charging device in real time, so that the charging device works according to the charging power limits. When there are discharging devices, it also issues discharging power limits to each discharging device, so that the discharging device works according to the discharging power limits.

[0037] (2) Energy Routing Unit (ERU): Deployed on the distribution side of the community or park as a key node, serving as the execution unit for local power monitoring and control. In this embodiment, the following two key parameters are configured on the ERU: node capacity limit M and node capacity warning value percentage u, in order to configure the core parameters of the node. The node capacity limit M is the maximum safe power consumption allowed by the local power grid under the jurisdiction of the ERU. The node capacity warning value percentage u is an adjustable safety factor (for example, the value range is 20%~100%, and the specific value can be determined according to the user's needs). The purpose of configuring the core parameters of the node is to calculate the real-time load margin. The real-time load margin Mr = node capacity limit M × node capacity warning value percentage u - real-time total load power Mt.

[0038] The core functions of ERU include: 1) Data Acquisition: Real-time collection and statistics of electricity consumption data of the local power grid under its jurisdiction, including the total load power data of the electricity meter and the electricity consumption data of each charging device connected to the lower level.

[0039] 2) Command execution: Receive power scheduling commands from the scheduling platform and directly issue power scheduling commands and power on / off commands to the subordinate charging equipment to achieve rapid response to transient power changes (target response time 5~10 seconds).

[0040] (3) Charging equipment: including AC charging equipment and DC charging equipment. The charging equipment has the ability to communicate with the scheduling platform and ERU, and can receive and execute power scheduling instructions (start / stop charging, adjust charging power) issued by the scheduling platform or ERU.

[0041] Each charging device has a rated power, and charging devices that are already charging will report the required power and the actual power in real time.

[0042] The orderly charging scheduling system in this embodiment may also include a communication network, which is used to realize data interaction between ERU, charging equipment and scheduling platform. In the short term, the charging equipment is scheduled through the scheduling platform first, and the charging equipment can also be scheduled through ERU later.

[0043] The following is a detailed description of the power node-based ordered charging scheduling method for electric vehicles used in this embodiment.

[0044] (a) Collect power data and calculate real-time load margin. In this embodiment, the real-time total load power of the sub-station area is obtained, and the real-time load margin of the sub-station area is calculated based on the node capacity limit of the sub-station area and the real-time total load power. The sub-station area is the area that needs to be scheduled for orderly charging of electric vehicles.

[0045] When collecting power data, the ERU collects the real-time total load power Mt of the local power grid under its jurisdiction. The real-time total load power Mt includes uncontrollable load power Mn, controllable load power Mk, and controllable discharge load power Mv, which satisfy the relationship Mt=Mn+Mk-Mv. Uncontrollable loads refer to loads that cannot be dispatched and must be supplied with power normally. Controllable loads refer to loads that can be dispatched. Controllable discharge loads refer to loads that feed back power to the grid. The real-time total load power is updated in real time and needs to be collected in real time and sent to the dispatch platform in real time. At this time, the dispatch platform can obtain the real-time total load power of the sub-station area.

[0046] After obtaining the real-time total load power, the real-time load margin Mr is calculated using the formula: Mr = M × u - Mt. At this point, based on the node capacity limit of the substation area and the real-time total load power, the real-time load margin of the substation area is calculated. Specifically, this includes: calculating the product of the node capacity limit M of the substation area and the node capacity warning value percentage u of the substation area to obtain the available capacity of the substation area; and calculating the difference between the available capacity of the substation area and the real-time total load power Mt to obtain the real-time load margin Mr of the substation area.

[0047] (ii) Responding to new charging access requests and executing scheduling decisions like Figure 3 As shown, when a charging device requests to connect for charging, the requested power is compared with the real-time load margin Mr, and the following power scheduling strategy is executed: (1) If the requested access power is less than or equal to the real-time load margin Mr, the charging device that issued the charging access request is allowed to start charging and the charging power limit is issued as the requested access power.

[0048] (2) If the requested access power > real-time load margin Mr ≥ 50% of the requested access power (requested access power × 50%, 50% can be adjusted to other values ​​based on user needs), then the charging device that issued the charging access request is allowed to start charging, and the charging power limit is issued as the real-time load margin Mr.

[0049] (3) If 50% of the requested access power is greater than the real-time load margin Mr, then calculate the total power reduction margin A of all charging devices in the charging state. The total power reduction margin A = the total DC power reduction margin A1 of DC charging devices in the charging state + the total AC power reduction margin A2 of AC charging devices in the charging state. The total DC power reduction margin A1 = the sum of the actual power of all DC charging devices in the charging state - the sum of 50% (rated power × 50%) of the rated power of all DC charging devices in the charging state. The total AC power reduction margin A2 = the sum of the actual power of all AC charging devices in the charging state - the sum of 50% of the rated power of all AC charging devices in the charging state. Compare the 50% of the requested access power with the total power reduction margin A and the total DC power reduction margin A1, and execute the following power scheduling strategy: 1) If 50% of the requested access power is greater than the total available power margin A, the charging device that issued the charging access request is prohibited from starting charging, or the charging access request is placed in the waiting queue to wait for charging to start.

[0050] 2) If 50% of the requested access power is less than or equal to the total DC power derating margin A1, then calculate the power derating factor K1 for all DC charging devices in the charging state. The power derating factor K1 = (real-time load margin Mr + sum of the actual power of all DC charging devices in the charging state - 50% of the requested access power) / (sum of the actual power of all DC charging devices in the charging state). A new charging power limit (original charging power limit × K1) is issued to all DC charging devices in the charging state, and the charging device that issued the charging access request is allowed to start charging. The issued charging power limit is 50% of the requested access power.

[0051] 3) If the total derating power margin A ≥ 50% of the requested access power > the total DC derating power margin A1, then first reduce the charging power limit of all DC charging devices in the charging state to 50% of their rated power. Then calculate the power derating factor K2 of the AC charging devices in the charging state. The power derating factor K2 = (total AC derating power margin A2 + sum of the actual power of all AC charging devices in the charging state) / (requested access power - total DC derating power margin A1 + sum of the actual power of all AC charging devices in the charging state). Issue a new charging power limit (original charging power limit × K2) to all AC charging devices in the charging state, and allow the charging devices that have issued charging access requests to start charging. The issued charging power limit is 50% of the requested access power.

[0052] In this embodiment, when a charging device requests to access charging, the target power of the first target charging device is determined based on the real-time load margin of the substation area and the requested access power of the charging device. A power scheduling instruction is then issued to the first target charging device so that the actual power of the first target charging device is the target power. The first target charging device includes the charging device requesting to access charging and the charging device in a charging state. The charging device is used to charge electric vehicles.

[0053] Specifically, determining the target power of the first target charging device based on the real-time load margin of the substation area and the requested access power of the charging device requesting access includes: (1) Determine whether the requested access power of the charging equipment is less than or equal to the real-time load margin of the substation area to obtain the first judgment result.

[0054] (2) If the first judgment result is yes, then the target power of the charging device requesting access to charging is determined as the requested access power, and the target power of the charging device in the charging state is determined as the actual power, so as to determine the target power of the first target charging device.

[0055] (3) If the first judgment result is negative, calculate the product of the requested access power and the first preset ratio to obtain the lower limit of the rechargeable power, and determine whether the lower limit of the rechargeable power is less than or equal to the real-time load margin to obtain the second judgment result.

[0056] The first preset ratio can be 50%. This ratio ensures that the charging equipment is in normal working condition and will not be damaged.

[0057] (4) If the second judgment result is yes, then the target power of the charging device requesting access to charging is determined to be the real-time load margin, and the target power of the charging device in the charging state is determined to be the actual power, so as to determine the target power of the first target charging device.

[0058] (5) If the second judgment result is negative, calculate the total power reduction margin of the charging device in the charging state, determine whether the lower limit of the charging power is greater than the total power reduction margin, and obtain the third judgment result.

[0059] The calculation of the total power reduction margin for charging devices in the charging state specifically includes: for each charging device in the charging state, calculating the product of the rated power of the charging device in the charging state and the second preset ratio to obtain the lower limit of the power of the charging device in the charging state; calculating the difference between the actual power of the charging device in the charging state and the lower limit of the power to obtain the power reduction margin of the charging device in the charging state; and calculating the sum of the power reduction margins of each charging device in the charging state to obtain the total power reduction margin of the charging devices in the charging state.

[0060] The second preset ratio can be 50%.

[0061] (6) If the third judgment result is yes, then the target power of the charging device requesting access to charging is determined to be 0, and the target power of the charging device in the charging state is determined to be the actual power, so as to determine the target power of the first target charging device.

[0062] (7) If the third judgment result is negative, calculate the power derating factor of the charging device in the charging state, calculate the product of the actual power of the charging device in the charging state and the power derating factor, obtain the derating power of the charging device in the charging state, determine the target power of the charging device requesting access to charging as the lower limit of the rechargeable power, determine the target power of the charging device in the charging state as the derating power, and determine the target power of the first target charging device.

[0063] Charging devices in a charging state include both DC charging devices and AC charging devices. In this case, the power derating factor for the charging device in a charging state is calculated, specifically including: (1) Calculate the total DC power reduction margin of the DC charging device in the charging state, and calculate the total AC power reduction margin of the AC charging device in the charging state. The sum of the total DC power reduction margin and the total AC power reduction margin is the total power reduction margin.

[0064] The calculation of the total DC power reduction margin for DC charging devices in the charging state specifically includes: for each DC charging device in the charging state, calculating the product of the rated power of the DC charging device in the charging state and the second preset ratio to obtain the lower limit of the power of the DC charging device in the charging state; calculating the difference between the actual power of the DC charging device in the charging state and the lower limit of the power to obtain the power reduction margin of the DC charging device in the charging state; and calculating the sum of the power reduction margins of each DC charging device in the charging state to obtain the total DC power reduction margin of the DC charging devices in the charging state.

[0065] The calculation of the total AC power reduction margin for AC charging devices in the charging state specifically includes: for each AC charging device in the charging state, calculating the product of the rated power of the AC charging device in the charging state and the second preset ratio to obtain the lower limit of the power of the AC charging device in the charging state; calculating the difference between the actual power of the AC charging device in the charging state and the lower limit of the power to obtain the power reduction margin of the AC charging device in the charging state; and calculating the sum of the power reduction margins of each AC charging device in the charging state to obtain the total AC power reduction margin of the AC charging devices in the charging state.

[0066] (2) Determine whether the lower limit of rechargeable power is less than or equal to the total DC power reduction margin.

[0067] (3) If so, calculate the sum of the actual power of the DC charging device in the charging state, and obtain the sum of the actual DC power. Based on the real-time load margin, the lower limit of the rechargeable power and the sum of the actual DC power, calculate the power derating factor of the DC charging device in the charging state. Take 1 as the power derating factor of the AC charging device in the charging state to calculate the power derating factor of the charging device in the charging state.

[0068] Based on the real-time load margin, the lower limit of rechargeable power, and the sum of actual DC power, the power derating factor of the DC charging equipment in the charging state is calculated. Specifically, this includes: calculating the sum of the real-time load margin and the sum of actual DC power to obtain a first sum; calculating the difference between the first sum and the lower limit of rechargeable power to obtain a first difference; and calculating the ratio of the first difference to the sum of actual DC power to obtain the power derating factor of the DC charging equipment in the charging state.

[0069] (4) If not, the power derating factor of the DC charging device in the charging state is calculated based on the actual power and rated power of the DC charging device in the charging state, the sum of the actual power of the AC charging device in the charging state is calculated, and the sum of the actual AC power is obtained. Based on the requested access power, the total margin of DC power that can be reduced, the total margin of AC power that can be reduced, and the sum of the actual AC power, the power derating factor of the AC charging device in the charging state is calculated.

[0070] Based on the actual power and rated power of the DC charging device in the charging state, the power derating factor of the DC charging device in the charging state is calculated. Specifically, for each DC charging device in the charging state, the rated power of the DC charging device in the charging state is calculated as the product of the rated power of the DC charging device in the charging state and the second preset ratio to obtain the lower limit of the power of the DC charging device in the charging state. The ratio of the lower limit of the power of the DC charging device in the charging state to the actual power is calculated to obtain the power derating factor of the DC charging device in the charging state.

[0071] Based on the requested access power, the total DC power reduction margin, the total AC power reduction margin, and the actual AC power, the power derating factor of the AC charging device in the charging state is calculated. Specifically, this includes: calculating the sum of the total AC power reduction margin and the actual AC power to obtain a second sum; calculating the difference between the requested access power and the total DC power reduction margin to obtain a second difference; calculating the sum of the second difference and the actual AC power to obtain a third sum; and calculating the ratio of the second sum to the third sum to obtain the power derating factor of the AC charging device in the charging state.

[0072] Through the above process, the target power of the first target charging device can be determined. Subsequently, a power scheduling instruction is generated based on the target power and sent to the first target charging device so that the actual power of the first target charging device is the target power. The power scheduling instruction can be sent directly by the scheduling platform or sent by the scheduling platform to the ERU and then forwarded by the ERU.

[0073] (iii) When restoring power, priority shall be given to restoring the power of restricted equipment (i.e., charging equipment in a power derating state), and scheduling decisions shall be executed. like Figure 4 As shown, when the real-time load margin Mr recovers to a value greater than the set threshold (e.g., 7kW, or other values ​​depending on user needs), and some charging devices are in a power derating state (also known as a limit derating state), the difference between the demand power and the actual power of all charging devices in the charging state is calculated to obtain the total demand power difference B, where B>0. The total demand power difference B = the total difference in DC demand power of all DC charging devices in the charging state B1 + the total difference in AC demand power of all AC charging devices in the charging state B2. The total difference in DC demand power B1 = the sum of the demand power of all DC charging devices in the charging state - the sum of the actual power of all DC charging devices in the charging state. The total difference in AC demand power B2 = the sum of the demand power of all AC charging devices in the charging state - the sum of the actual power of all AC charging devices in the charging state. Comparing the real-time load margin Mr with the total demand power difference B and the total AC demand power difference B2, the following power scheduling strategy is executed: (1) If the real-time load margin Mr < the total difference in AC demand power B2, then calculate the power enhancement coefficient K3 of the AC charging equipment in the charging state. The power enhancement coefficient K3 = (real-time load margin Mr + the sum of the actual power of all AC charging equipment in the charging state) / the sum of the actual power of all AC charging equipment in the charging state. K3 > 1, and increase the charging power limit of all AC charging equipment in the charging state (original charging power limit × K3).

[0074] The required power is the smaller of the power obtained by multiplying the requested current received by the charging equipment from the vehicle (i.e., the electric vehicle) by the actual voltage and the current maximum output power of the charging equipment.

[0075] (2) If the total difference in demand power B > real-time load margin Mr ≥ total difference in AC demand power B2, then restore the charging power limit of all AC charging equipment in the charging state to its demand power, and then calculate the power enhancement coefficient K4 of all DC charging equipment in the charging state. The power enhancement coefficient K4 = (real-time load margin Mr - total difference in AC demand power B2 + sum of actual power of all DC charging equipment in the charging state) / sum of actual power of all DC charging equipment in the charging state. K4 > 1, and increase the charging power limit of all DC charging equipment in the charging state (original charging power limit × K4).

[0076] (3) If the real-time load margin Mr is greater than or equal to the total difference in demand power B, then the charging power limit of all charging devices in the charging state shall be restored to their demand power.

[0077] In this embodiment, when no charging device requests access for charging, but the real-time load margin of the substation area is greater than or equal to a set threshold, and a charging device is in a power derating state, the target power of the second target charging device is determined based on the real-time load margin of the substation area, and a power scheduling command is issued to the second target charging device, so that the actual power of the second target charging device is the target power, the power derating state is that the actual power of the charging device is less than the required power, and the second target charging device is a charging device in a charging state.

[0078] Specifically, determining the target power of the second target charging device based on the real-time load margin of the substation area includes: (1) Calculate the sum of the power demand differences of the charging equipment in the charging state to obtain the total power demand difference. The power demand difference is the difference between the demand power and the actual power.

[0079] (2) Determine whether the real-time load margin is greater than or equal to the total difference in demand power.

[0080] (3) If so, then the target power of the second target charging device is determined to be the required power.

[0081] (4) If not, calculate the power enhancement coefficient of the second target charging device, calculate the product of the actual power of the second target charging device and the power enhancement coefficient, obtain the enhanced power of the second target charging device, and determine the target power of the second target charging device as the enhanced power.

[0082] The charging devices in the charging state include DC charging devices and AC charging devices. In this case, the power enhancement coefficient of the second target charging device is calculated, specifically including: (1) Calculate the sum of the power demand differences of the DC charging equipment in the charging state to obtain the total power demand difference of DC. Calculate the sum of the power demand differences of the AC charging equipment in the charging state to obtain the total power demand difference of AC. The sum of the total power demand difference of DC and AC is the total power demand difference.

[0083] (2) Determine whether the real-time load margin is less than the total difference in AC power demand.

[0084] (3) If so, calculate the sum of the actual power of the AC charging device in the charging state, and obtain the sum of the actual AC power. Based on the real-time load margin and the sum of the actual AC power, calculate the power boost coefficient of the AC charging device in the charging state. Take 1 as the power boost coefficient of the DC charging device in the charging state to calculate the power boost coefficient of the charging device in the charging state.

[0085] Based on the sum of real-time load margin and actual AC power, the power enhancement coefficient of the AC charging device in charging state is calculated. Specifically, this includes: calculating the sum of real-time load margin and actual AC power to obtain a fourth sum; calculating the ratio of the fourth sum to the sum of actual AC power to obtain the power enhancement coefficient of the AC charging device in charging state.

[0086] (4) If not, the power boosting coefficient of the AC charging device in the charging state is calculated based on the actual power and demand power of the AC charging device in the charging state. The sum of the actual power of the DC charging device in the charging state is calculated to obtain the sum of the actual DC power. Based on the real-time load margin, the total difference of AC demand power and the sum of the actual DC power, the power boosting coefficient of the DC charging device in the charging state is calculated to obtain the power boosting coefficient of the charging device in the charging state.

[0087] Based on the actual power and demand power of the AC charging device in the charging state, the power enhancement coefficient of the AC charging device in the charging state is calculated. Specifically, for each AC charging device in the charging state, the ratio of the demand power to the actual power of the AC charging device in the charging state is calculated to obtain the power enhancement coefficient of the AC charging device in the charging state.

[0088] Based on the real-time load margin, the total difference in AC power demand, and the sum of actual DC power, the power enhancement coefficient of the DC charging equipment in the charging state is calculated. Specifically, this includes: calculating the difference between the real-time load margin and the total difference in AC power demand to obtain the third difference; calculating the sum of the third difference and the sum of actual DC power to obtain the fifth sum; and calculating the ratio of the fifth sum to the sum of actual DC power to obtain the power enhancement coefficient of the DC charging equipment in the charging state.

[0089] The dispatching platform and ERU continuously monitor the grid load status and charging equipment operation status, and perform power dispatching in cycles to achieve dynamic and refined dispatching of charging load.

[0090] To address the lack of comprehensive consideration and dynamic fine-tuning capabilities for real-time grid load, characteristics of different types of charging equipment, and real-time power demand of vehicles, this embodiment discloses an orderly charging scheduling method for electric vehicles based on power nodes. This method aims to solve the intelligent scheduling problem of electric vehicle charging load under limited grid capacity. It designs a scheduling platform, an Energy Routing Unit (ERU), and charging equipment. The ERU is deployed at key nodes on the distribution side, serving as a power monitoring and execution node. It monitors the total load power of its jurisdiction in real time and uses a preset node capacity limit as a constraint. The scheduling platform executes a fine-tuning strategy based on dynamic load margin: when a new charging request is received, it is prioritized to be met within the load margin; when the load margin is insufficient, the power of operating DC and AC charging equipment is proportionally reduced to accommodate the new charging request; when power is restored, the power of AC charging equipment is restored first. This strategy clearly distinguishes between charging equipment types and follows the principle of "reducing power first for DC then AC, restoring power first for AC then DC," achieving continuous adjustment and start-stop control of the power of each charging device. This maximizes the charging demand satisfaction rate while ensuring grid safety, thereby improving the overall utilization efficiency of the grid capacity.

[0091] Compared with related technologies, this embodiment has the following significant advantages: (1) Achieve refined power management: By continuously and dynamically adjusting the power of each charging device, instead of simply starting and stopping, it is no longer just a simple start-stop control, but achieves continuous, dynamic and refined adjustment of the charging power of each charging device, which greatly improves the utilization efficiency of the limited grid capacity.

[0092] (2) Ensure the safety of power grid operation: With real-time monitoring of ERU and preset capacity hard constraints as the core, that is, the local total load power is monitored in real time through ERU and the preset node capacity upper limit is used as a hard constraint, which fundamentally avoids the risk of power grid overload.

[0093] (3) Strategy tailored to equipment characteristics: Considering the differences in the characteristics of charging equipment, the power scheduling strategy clearly distinguishes between AC charging equipment and DC charging equipment, and follows the priority of "reducing power first DC and then AC, and restoring power first AC and then DC", thereby formulating differentiated control priorities, which are more in line with the control characteristics of different charging equipment (i.e., in line with the actual equipment characteristics) and user experience.

[0094] (4) The system configuration is flexible and scalable: It supports site-level configuration and key parameters (such as node capacity limit) are adjustable, which is convenient to adapt to different scenarios and lays the foundation for further integration of photovoltaic, energy storage, V2G (vehicle to grid) and other elements to form an integrated photovoltaic-storage-charging-discharging system.

[0095] (5) Balance between user experience and grid efficiency: Under the premise of ensuring grid safety, the intelligent algorithm maximizes the satisfaction of users' charging needs and prioritizes the restoration of devices with limited power when there is sufficient power, thus achieving a good balance between user experience and grid operation efficiency.

[0096] Example 2 In one exemplary embodiment, a power node-based orderly charging scheduling system for electric vehicles is provided, which includes an energy routing unit and a scheduling platform.

[0097] The energy routing unit is used to collect the real-time total load power of the substation area.

[0098] The scheduling platform is communicatively connected to the energy routing unit and is used to execute the power node-based orderly charging scheduling method for electric vehicles in Example 1.

[0099] Example 3 In one exemplary embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows. Figure 5 As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores data. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network. When executed by the processor, the computer program implements a power node-based ordered charging scheduling method for electric vehicles.

[0100] Figure 5The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0101] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the power node-based ordered charging scheduling method for electric vehicles in Embodiment 1.

[0102] Example 4 In one exemplary embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, implements the power node-based ordered charging scheduling method for electric vehicles in Embodiment 1.

[0103] Example 5 In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the power node-based ordered charging scheduling method for electric vehicles in Embodiment 1.

[0104] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of related data must comply with relevant regulations and be authorized by the owner of the corresponding device.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A power node-based orderly charging scheduling method for electric vehicles, characterized in that, The method includes: The real-time total load power of the sub-area is obtained, and the real-time load margin of the sub-area is calculated based on the node capacity limit and the real-time total load power of the sub-area; the sub-area is the area that needs to be scheduled for orderly charging of electric vehicles. When a charging device requests to connect for charging, the target power of the first target charging device is determined based on the real-time load margin of the substation area and the requested access power of the charging device. A power scheduling instruction is then issued to the first target charging device so that the actual power of the first target charging device is the target power. The first target charging device includes the charging device requesting to connect for charging and the charging device in the charging state. The charging device is used to charge electric vehicles. When no charging device requests access to charging, but the real-time load margin of the substation area is greater than or equal to the set threshold, and a charging device is in a power derating state, the target power of the second target charging device is determined based on the real-time load margin of the substation area, and a power scheduling command is issued to the second target charging device so that the actual power of the second target charging device is the target power; the power derating state is when the actual power of the charging device is less than the required power, and the second target charging device is a charging device in a charging state.

2. The power node based EVs orderly charging scheduling method according to claim 1, wherein, Based on the real-time load margin of the sub-station and the requested access power of the charging equipment requesting access, the target power of the first target charging equipment is determined, specifically including: Determine whether the requested access power of the charging device is less than or equal to the real-time load margin of the substation area to obtain the first judgment result; If the first judgment result is yes, then the target power of the charging device requesting access to charging is determined as the requested access power, and the target power of the charging device in the charging state is determined as the actual power, so as to determine the target power of the first target charging device. If the first judgment result is negative, the product of the requested access power and the first preset ratio is calculated to obtain the lower limit of the rechargeable power. It is then determined whether the lower limit of the rechargeable power is less than or equal to the real-time load margin to obtain the second judgment result. If the second judgment result is yes, then the target power of the charging device requesting access to charging is determined to be the real-time load margin, and the target power of the charging device in the charging state is determined to be the actual power, so as to determine the target power of the first target charging device. If the second judgment result is negative, calculate the total power reduction margin of the charging device in the charging state, determine whether the lower limit of the charging power is greater than the total power reduction margin, and obtain the third judgment result. If the third judgment result is yes, then the target power of the charging device requesting access to charging is determined to be 0, and the target power of the charging device in the charging state is determined to be the actual power, so as to determine the target power of the first target charging device. If the third judgment result is negative, then calculate the power derating factor of the charging device in the charging state, calculate the product of the actual power of the charging device in the charging state and the power derating factor, obtain the drated power of the charging device in the charging state, determine the target power of the charging device requesting access to charging as the lower limit of the rechargeable power, determine the target power of the charging device in the charging state as the drated power, and determine the target power of the first target charging device.

3. The electric vehicle orderly charging scheduling method based on power nodes according to claim 2, characterized in that, Charging devices in a charging state include both DC charging devices and AC charging devices. In this case, the power derating factor for the charging device in a charging state is calculated, specifically including: Calculate the total DC power slashing margin of a DC charging device in the charging state, and calculate the total AC power slashing margin of an AC charging device in the charging state; the sum of the total DC power slashing margin and the total AC power slashing margin is the total power slashing margin. Determine whether the lower limit of rechargeable power is less than or equal to the total DC scalable power margin; If so, calculate the sum of the actual power of the DC charging device in the charging state to obtain the sum of the actual DC power. Based on the real-time load margin, the lower limit of the rechargeable power and the sum of the actual DC power, calculate the power derating factor of the DC charging device in the charging state. Take 1 as the power derating factor of the AC charging device in the charging state to calculate the power derating factor of the charging device in the charging state. If not, then based on the actual power and rated power of the DC charging device in the charging state, the power derating factor of the DC charging device in the charging state is calculated, the sum of the actual power of the AC charging device in the charging state is calculated, and the sum of the actual AC power is obtained. Based on the requested access power, the total DC power reduction margin, the total AC power reduction margin, and the sum of the actual AC power, the power derating factor of the AC charging device in the charging state is calculated.

4. The electric vehicle orderly charging scheduling method based on power nodes according to claim 3, characterized in that, The calculation of the total power reduction margin for charging devices in the charging state specifically includes: for each charging device in the charging state, calculating the product of the rated power of the charging device in the charging state and the second preset ratio to obtain the lower limit of the power of the charging device in the charging state; calculating the difference between the actual power of the charging device in the charging state and the lower limit of the power to obtain the power reduction margin of the charging device in the charging state; and calculating the sum of the power reduction margins of each charging device in the charging state to obtain the total power reduction margin of the charging devices in the charging state. The calculation of the total DC power reduction margin for DC charging devices in the charging state specifically includes: for each DC charging device in the charging state, calculating the product of the rated power of the DC charging device in the charging state and the second preset ratio to obtain the lower limit of the power of the DC charging device in the charging state; calculating the difference between the actual power of the DC charging device in the charging state and the lower limit of the power to obtain the power reduction margin of the DC charging device in the charging state; and calculating the sum of the power reduction margins of each DC charging device in the charging state to obtain the total DC power reduction margin of the DC charging devices in the charging state. The calculation of the total AC power reduction margin for AC charging devices in charging state includes: for each AC charging device in charging state, calculating the product of the rated power of the AC charging device in charging state and the second preset ratio to obtain the lower limit of the power of the AC charging device in charging state; calculating the difference between the actual power of the AC charging device in charging state and the lower limit of the power to obtain the power reduction margin of the AC charging device in charging state; and calculating the sum of the power reduction margins of each AC charging device in charging state to obtain the total AC power reduction margin of the AC charging devices in charging state.

5. The electric vehicle orderly charging scheduling method based on power nodes according to claim 3, characterized in that, Based on the real-time load margin, the lower limit of rechargeable power, and the sum of actual DC power, the power derating factor of the DC charging equipment in the charging state is calculated. Specifically, this includes: calculating the sum of the real-time load margin and the sum of actual DC power to obtain a first sum; calculating the difference between the first sum and the lower limit of rechargeable power to obtain a first difference; and calculating the ratio of the first difference to the sum of actual DC power to obtain the power derating factor of the DC charging equipment in the charging state. Based on the actual power and rated power of the DC charging device in the charging state, the power derating factor of the DC charging device in the charging state is calculated. Specifically, for each DC charging device in the charging state, the rated power of the DC charging device in the charging state is calculated as the product of the rated power of the DC charging device in the charging state and the second preset ratio to obtain the lower limit of the power of the DC charging device in the charging state. The ratio of the lower limit of the power of the DC charging device in the charging state to the actual power is calculated to obtain the power derating factor of the DC charging device in the charging state. Based on the requested access power, the total DC power reduction margin, the total AC power reduction margin, and the actual AC power, the power derating factor of the AC charging device in the charging state is calculated. Specifically, this includes: calculating the sum of the total AC power reduction margin and the actual AC power to obtain a second sum; calculating the difference between the requested access power and the total DC power reduction margin to obtain a second difference; calculating the sum of the second difference and the actual AC power to obtain a third sum; and calculating the ratio of the second sum to the third sum to obtain the power derating factor of the AC charging device in the charging state.

6. The electric vehicle ordered charging scheduling method based on power nodes according to claim 1, characterized in that, The target power of the second target charging equipment is determined based on the real-time load margin of the substation area, specifically including: Calculate the sum of the power demand differences of charging devices in the charging state to obtain the total power demand difference; the power demand difference is the difference between the demanded power and the actual power. Determine whether the real-time load margin is greater than or equal to the total difference in demand power. If so, then the target power of the second target charging device is determined to be the required power; If not, calculate the power enhancement coefficient of the second target charging device, calculate the product of the actual power of the second target charging device and the power enhancement coefficient, obtain the enhanced power of the second target charging device, and determine the target power of the second target charging device as the enhanced power.

7. The electric vehicle orderly charging scheduling method based on power nodes according to claim 6, characterized in that, The charging devices in the charging state include DC charging devices and AC charging devices. At this time, the power enhancement coefficient of the second target charging device is calculated, specifically including: Calculate the sum of the power demand differences of DC charging devices in the charging state to obtain the total DC power demand difference; calculate the sum of the power demand differences of AC charging devices in the charging state to obtain the total AC power demand difference; the sum of the total DC power demand difference and the total AC power demand difference is the total power demand difference. Determine whether the real-time load margin is less than the total difference in AC power demand. If so, calculate the sum of the actual power of the AC charging equipment in the charging state, obtain the sum of the actual AC power, and calculate the power enhancement coefficient of the AC charging equipment in the charging state based on the real-time load margin and the sum of the actual AC power. Take 1 as the power enhancement coefficient of the DC charging equipment in the charging state to calculate the power enhancement coefficient of the charging equipment in the charging state. If not, then based on the actual power and demand power of the AC charging equipment in the charging state, the power enhancement coefficient of the AC charging equipment in the charging state is calculated, the sum of the actual power of the DC charging equipment in the charging state is calculated, and the sum of the actual DC power is obtained. Based on the real-time load margin, the total difference of AC demand power and the sum of the actual DC power, the power enhancement coefficient of the DC charging equipment in the charging state is calculated, so as to calculate the power enhancement coefficient of the charging equipment in the charging state.

8. The electric vehicle ordered charging scheduling method based on power nodes according to claim 7, characterized in that, Based on the sum of real-time load margin and actual AC power, the power enhancement coefficient of the AC charging equipment in the charging state is calculated. Specifically, this includes: calculating the sum of real-time load margin and actual AC power to obtain a fourth sum; calculating the ratio of the fourth sum to the sum of actual AC power to obtain the power enhancement coefficient of the AC charging equipment in the charging state. Based on the actual power and demand power of the AC charging device in the charging state, the power enhancement coefficient of the AC charging device in the charging state is calculated. Specifically, for each AC charging device in the charging state, the ratio of the demand power to the actual power of the AC charging device in the charging state is calculated to obtain the power enhancement coefficient of the AC charging device in the charging state. Based on the real-time load margin, the total difference in AC power demand, and the sum of actual DC power, the power enhancement coefficient of the DC charging equipment in the charging state is calculated. Specifically, this includes: calculating the difference between the real-time load margin and the total difference in AC power demand to obtain the third difference; calculating the sum of the third difference and the sum of actual DC power to obtain the fifth sum; and calculating the ratio of the fifth sum to the sum of actual DC power to obtain the power enhancement coefficient of the DC charging equipment in the charging state.

9. A power node-based ordered charging scheduling system for electric vehicles, characterized in that, The system includes: an energy routing unit and a scheduling platform; The energy routing unit is used to collect the real-time total load power of the substation area; The scheduling platform is communicatively connected to the energy routing unit; the scheduling platform is used to execute the electric vehicle orderly charging scheduling method based on power nodes as described in any one of claims 1-8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the power node-based ordered charging scheduling method for electric vehicles as described in any one of claims 1-8.

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