Power control method of off-grid optical storage and charging station and related equipment

Abstract

The invention provides a power control method and related equipment for an off-grid optical storage and charging station, and the method can execute a corresponding control strategy according to a preset threshold value through monitoring the photovoltaic power generation power, the energy storage charge state and the charging pile demand power. When the photovoltaic power generation is sufficient and the energy storage electric quantity is relatively low, the energy storage is charged while the charging requirement is met; when the photovoltaic power generation is sufficient but the stored energy is saturated, the photovoltaic output power is limited to match the power demand; when the photovoltaic power generation is insufficient and the energy storage electric quantity is sufficient, the energy storage provides power compensation; and when the photovoltaic power generation is insufficient and the energy storage electric quantity is too low, the charging power is limited to be within the photovoltaic power generation capacity range. By applying the method provided by the embodiment of the invention, the power supply and demand balance in the off-grid optical storage and charging station can be kept, the stable operation of the off-grid optical storage and charging station can be realized, and the ordered charging is realized.

Description

Technical Field

[0001] This application relates to the field of control technology, and in particular to a power control method and related equipment for an off-grid photovoltaic energy storage and charging station. Background Technology

[0002] In off-grid photovoltaic-storage-charging stations, existing technologies generally employ control strategies based on fixed operating modes. These methods typically switch system operating states according to preset time periods, such as prioritizing photovoltaic power during the day and switching to energy storage power at night. However, this control approach struggles to adapt to the random fluctuations in photovoltaic power generation and cannot effectively respond to sudden changes in charging load. When encountering conditions such as rapid changes in sunlight intensity or simultaneous operation of multiple charging piles, the system is prone to power supply-demand imbalances, affecting power supply reliability and equipment operational safety. Summary of the Invention

[0003] The technical problem this application aims to solve is to provide a power control method and related equipment for off-grid photovoltaic energy storage and charging stations, which can maintain a power supply and demand balance in the system. The specific solution is as follows:

[0004] A power control method for an off-grid photovoltaic energy storage and charging station includes:

[0005] Acquire equipment operation data in the photovoltaic-storage-charging station; the equipment operation data includes the power generation of the photovoltaic power generation equipment, the state of charge of the energy storage equipment, and the power demand of the charging piles.

[0006] When the power output of the photovoltaic power generation equipment is not less than the power demand of the charging pile, and the state of charge of the energy storage device is lower than the first threshold, the photovoltaic power generation equipment is controlled to supply power to the charging pile and charge the energy storage device according to the power demand.

[0007] When the power output of the photovoltaic power generation device is not less than the power demand of the charging pile, and the state of charge of the energy storage device is greater than a second threshold, a power limiting operation is performed on the photovoltaic power generation device to match the power demand of the charging pile; wherein, the second threshold is greater than the first threshold;

[0008] When the power output of the photovoltaic power generation device is less than the power demand of the charging pile, and the state of charge of the energy storage device is greater than the third threshold, the photovoltaic power generation device is controlled to supply power to the charging pile, and the energy storage device is controlled to perform power compensation for the charging pile.

[0009] If the power output of the photovoltaic power generation equipment is less than the power demand of the charging pile, and the state of charge of the energy storage equipment is not greater than the third threshold, the power demand of the charging pile shall be limited to not exceed the power output.

[0010] The third threshold is less than the first threshold.

[0011] Optionally, the above method may involve performing a power limiting operation on the photovoltaic power generation equipment to match the power output of the photovoltaic power generation equipment with the power demand of the charging pile, including:

[0012] The power adjustment value of the photovoltaic power generation equipment is determined based on the current power demand of the charging pile.

[0013] When the power adjustment value is greater than zero, a first control command is sent to the photovoltaic power generation equipment, the first control command being used to instruct the power generation of the photovoltaic power generation equipment to be limited to the power adjustment value;

[0014] When the power adjustment value is not greater than zero, a second control command is sent to the photovoltaic power generation equipment, the second control command being used to instruct the photovoltaic power generation equipment to shut down.

[0015] Optionally, in the above method, controlling the energy storage device to perform power compensation for the charging pile includes:

[0016] The power compensation value is determined based on the power output of the photovoltaic power generation equipment and the current power demand of the charging pile;

[0017] The smaller of the power compensation value and the rated discharge power of the energy storage device shall be used as the target power compensation value;

[0018] The energy storage device is controlled to provide power compensation to the charging pile according to the target power compensation value.

[0019] Optionally, the above method includes charging the energy storage device, which includes:

[0020] The charging power of the energy storage device is determined; the charging power is not greater than the rated charging power of the energy storage device, and the charging power is not greater than the difference between the power generation power and the power demand.

[0021] The photovoltaic power generation equipment is controlled to charge the energy storage device according to the charging power.

[0022] The above methods may also include:

[0023] Obtain the status parameters of the vehicle connected to the charging pile; the status parameters include the current state of charge, the target state of charge, and the allowed charging power.

[0024] The estimated departure time of the vehicle is determined based on the status parameters and the real-time power of the charging pile.

[0025] The charging power allocation of the vehicle is calculated by an optimization algorithm so that the state of charge of the vehicle at the expected departure time is not lower than the minimum required state of charge of the vehicle.

[0026] A power control device for an off-grid photovoltaic energy storage and charging station includes:

[0027] The acquisition unit is used to acquire equipment operation data in the photovoltaic-storage-charging station; the equipment operation data includes the power generation of the photovoltaic power generation equipment, the state of charge of the energy storage equipment, and the power demand of the charging pile.

[0028] The first execution unit is configured to, when the power generation of the photovoltaic power generation equipment is not less than the required power of the charging pile and the state of charge of the energy storage device is lower than a first threshold, control the photovoltaic power generation equipment to supply power to the charging pile and charge the energy storage device according to the required power.

[0029] The second execution unit is configured to perform a power limiting operation on the photovoltaic power generation equipment when the power generation of the photovoltaic power generation equipment is not less than the power demand of the charging pile and the state of charge of the energy storage equipment is greater than a second threshold, so that the power generation of the photovoltaic power generation equipment matches the power demand of the charging pile; the second threshold is greater than the first threshold.

[0030] The third execution unit is configured to control the photovoltaic power generation equipment to supply power to the charging pile and control the energy storage device to perform power compensation for the charging pile when the power generation of the photovoltaic power generation equipment is less than the power demand of the charging pile and the state of charge of the energy storage device is greater than a third threshold, wherein the third threshold is less than the first threshold.

[0031] The fourth execution unit is used to limit the power demand of the charging pile to no higher than the power generation power when the power generation power of the photovoltaic power generation equipment is less than the power demand of the charging pile and the state of charge of the energy storage equipment is not greater than the third threshold.

[0032] Optionally, the second execution unit of the aforementioned apparatus includes:

[0033] The first determining subunit is used to determine the power adjustment value of the photovoltaic power generation equipment based on the current power demand of the charging pile;

[0034] The first transmitting subunit is configured to send a first control command to the photovoltaic power generation device when the power adjustment value is greater than zero. The first control command is configured to instruct the photovoltaic power generation device to limit its power generation to the power adjustment value.

[0035] The second transmitting subunit is used to send a second control command to the photovoltaic power generation equipment when the power adjustment value is not greater than zero. The second control command is used to instruct the photovoltaic power generation equipment to shut down.

[0036] Optionally, the third execution unit in the aforementioned apparatus includes:

[0037] The second determining subunit is used to determine the power compensation value based on the power generation capacity of the photovoltaic power generation equipment and the current power demand of the charging pile;

[0038] An execution subunit is used to take the smaller of the power compensation value and the rated discharge power of the energy storage device as the target power compensation value;

[0039] A power compensation subunit is used to control the energy storage device to provide power compensation to the charging pile according to the target power compensation value.

[0040] A storage medium comprising stored instructions, wherein, when the instructions are executed, the device containing the storage medium is controlled to perform a power control method as described above for an off-grid optical storage and charging station.

[0041] An electronic device includes a memory and one or more instructions, wherein one or more instructions are stored in the memory and configured to be executed by one or more processors as described above for power control of an off-grid photovoltaic energy storage and charging station.

[0042] This application provides a power control method and related equipment for an off-grid photovoltaic-storage-charging station. The method includes: acquiring equipment operation data in the photovoltaic-storage-charging station; the equipment operation data includes the power generation of the photovoltaic power generation equipment, the state of charge of the energy storage equipment, and the power demand of the charging pile; when the power generation of the photovoltaic power generation equipment is not less than the power demand of the charging pile, and the state of charge of the energy storage equipment is lower than a first threshold, controlling the photovoltaic power generation equipment to supply power to the charging pile and charge the energy storage equipment according to the power demand; when the power generation of the photovoltaic power generation equipment is not less than the power demand of the charging pile, and the state of charge of the energy storage equipment is greater than a second threshold, controlling the photovoltaic power generation equipment to supply power to the charging pile and charge the energy storage equipment according to the power demand; when the power generation of the photovoltaic power generation equipment is not less than the power demand of the charging pile, and the state of charge of the energy storage equipment is greater than a second threshold, controlling the photovoltaic power generation equipment to supply power to the charging pile and charge the energy storage equipment according to the power demand. The photovoltaic (PV) power generation equipment performs power limiting operations to match the power output of the charging pile with the power demand of the charging pile; wherein, the second threshold is greater than the first threshold; when the power output of the PV power generation equipment is less than the power demand of the charging pile, and the state of charge (SBC) of the energy storage device is greater than a third threshold, the PV power generation equipment is controlled to supply power to the charging pile, and the energy storage device is controlled to perform power compensation for the charging pile; when the power output of the PV power generation equipment is less than the power demand of the charging pile, and the SBC of the energy storage device is not greater than the third threshold, the power demand of the charging pile is limited to not exceeding the power output; wherein, the third threshold is less than the first threshold. Applying the method provided in this application embodiment, the operating status of the equipment can be dynamically adjusted based on real-time data of PV power generation, energy storage SBC, and charging power demand, ensuring precise matching between power generation, power consumption, and energy storage power. This enables stable operation of off-grid PV-storage-charging stations and achieves orderly charging. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0044] Figure 1 A flowchart illustrating a power control method for an off-grid photovoltaic energy storage and charging station provided in this application;

[0045] Figure 2 A flowchart of a process for performing power limiting operation on photovoltaic power generation equipment is provided in this application;

[0046] Figure 3 A flowchart illustrating the process of controlling an energy storage device to perform power compensation on a charging pile, as provided in this application;

[0047] Figure 4A schematic diagram of the structure of a power control device for an off-grid photovoltaic energy storage and charging station provided in this application;

[0048] Figure 5 This is a schematic diagram of the structure of an electronic device provided in this application. Detailed Implementation

[0049] 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.

[0050] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] This application provides a power control method for an off-grid photovoltaic energy storage and charging station. This method can be applied to electronic devices, such as servers, personal computers, cloud computing platforms, etc. The flowchart of the method is shown below. Figure 1 As shown, it specifically includes:

[0052] S101: Obtain equipment operation data in the photovoltaic-storage-charging station; equipment operation data includes the power generation of photovoltaic power generation equipment, the state of charge of energy storage equipment, and the power demand of charging piles.

[0053] In this embodiment, the equipment operation data refers to the operating parameters that are periodically collected and uploaded to the electronic equipment by the sensing devices and communication modules deployed in the photovoltaic-storage-charging station. Specifically, the equipment operation data includes the power generation of the photovoltaic power generation equipment, the state of charge of the energy storage equipment, and the power demand of the charging pile.

[0054] In some embodiments, the device operating data may also include the limited power of the photovoltaic device, the limited power of the charging pile device, and the real-time power of the energy storage device, etc.

[0055] In some embodiments, equipment configuration information in the photovoltaic-storage-charging station can also be obtained, including the rated power (PVR) of the photovoltaic equipment, the rated power (PBR) of the energy storage equipment, the rated power (PCR) of the charging pile equipment, the upper limit of the energy storage state of charge (SOCmax), the lower limit of the energy storage state of charge (SOCmin), and the energy storage state of charge (SOCp) that needs to be put into operation by the photovoltaic equipment.

[0056] Optionally, the power output of a photovoltaic (PV) power generation device refers to the actual electrical power output of the PV array under specific lighting conditions. The real-time state of charge (SBC) of an energy storage device refers to the percentage of the current remaining charge of the energy storage battery relative to its rated capacity, used to characterize the energy reserve level of the energy storage device. The real-time power demand of a charging pile refers to the total charging power requested by all electric vehicles currently charging.

[0057] S102: When the power output of the photovoltaic power generation equipment is not less than the power demand of the charging pile, and the state of charge of the energy storage equipment is lower than the first threshold, the photovoltaic power generation equipment is controlled to supply power to the charging pile and charge the energy storage equipment according to the power demand.

[0058] In this embodiment, the first threshold corresponds to the lower limit of the state of charge (SBC) at which the energy storage device is allowed to begin charging. Optionally, when the power output of the photovoltaic (PV) power generation device is greater than or equal to the power demand of the charging pile, and the SBC of the energy storage device is lower than the first threshold, it indicates that the system is in an operating state of excess PV energy and insufficient energy storage reserves. At this time, the energy storage device has sufficient charging capacity. By storing the excess electrical energy of the PV power generation device in the energy storage device, the maximum local consumption of PV energy and energy transfer across time periods can be achieved, while ensuring that the energy reserves of the energy storage device are effectively replenished.

[0059] S103: When the power generation of the photovoltaic power generation equipment is not less than the power required by the charging pile, and the state of charge of the energy storage equipment is greater than the second threshold, a power limiting operation is performed on the photovoltaic power generation equipment to match the power required by the charging pile; wherein, the second threshold is greater than the first threshold.

[0060] In this embodiment, when the power output of the photovoltaic power generation equipment is greater than or equal to the power demand of the charging pile, and the state of charge of the energy storage equipment is higher than the second threshold, the system is characterized by an operating state where the photovoltaic power generation equipment has excess power output but the energy storage is saturated. Since the energy storage equipment has reached or is close to full charge, continuing to charge will lead to the risk of overcharging. By limiting the power output of the photovoltaic power generation equipment, the power output of the photovoltaic power generation equipment can be reduced, so that the power output of the photovoltaic power generation equipment matches the power demand of the charging pile, avoiding energy waste and maintaining the system power balance.

[0061] S104: When the power output of the photovoltaic power generation equipment is less than the power demand of the charging pile, and the state of charge of the energy storage equipment is greater than the third threshold, control the photovoltaic power generation equipment to supply power to the charging pile, and control the energy storage equipment to compensate the charging pile for power.

[0062] In this embodiment, when the photovoltaic power generation is less than the charging pile's required power and the energy storage device's state of charge is higher than the third threshold, it indicates that the system is in an operating state where photovoltaic power supply is insufficient but energy storage reserves are sufficient. At this time, the energy storage device has sufficient discharge capacity, and the system realizes a photovoltaic-energy storage combined power supply mode by activating energy storage device discharge compensation, ensuring the continuity of charging services while maintaining the energy storage device operating within a safe discharge range.

[0063] S105: When the power generation of the photovoltaic power generation equipment is less than the power demand of the charging pile, and the state of charge of the energy storage equipment is not greater than the third threshold, the power demand of the charging pile shall be limited to not exceeding the power generation.

[0064] The third threshold is less than the first threshold.

[0065] In this embodiment, when the photovoltaic power generation is less than the charging pile's required power and the energy storage device's state of charge is not higher than the third threshold, the system is in a state of insufficient photovoltaic power supply and critically low energy storage reserves. At this time, the system's energy reserves have reached the lower limit of safe operation. By limiting the charging pile's required power and implementing a load control strategy at the power consumption end, the system's total power load is limited to the real-time power generation capacity, preventing excessive discharge of the energy storage device and ensuring the system's most basic safe and stable operation.

[0066] By applying the method provided in the embodiments of this application, the operating status of the equipment can be dynamically adjusted according to real-time data of photovoltaic power generation, energy storage state of charge and charging demand, so as to ensure the precise matching between power generation, power consumption and energy storage, and enable the stable operation of off-grid photovoltaic-storage-charging stations and achieve orderly charging.

[0067] In one embodiment provided in this application, based on the above-described solution, optionally, a power limiting operation is performed on the photovoltaic power generation equipment to match the power demand of the charging pile, such as... Figure 2 As shown, it includes:

[0068] S201: Determine the power adjustment value of the photovoltaic power generation equipment based on the current power demand of the charging pile.

[0069] In this embodiment, the power adjustment value refers to the power value that needs to be adjusted to balance the output power of the photovoltaic power generation equipment with the power demand of the charging pile. Specifically, the power adjustment value can be the current power demand of the charging pile.

[0070] S202: When the power adjustment value is greater than zero, a first control command is sent to the photovoltaic power generation equipment. The first control command is used to indicate that the power generation of the photovoltaic power generation equipment is limited to the power adjustment value.

[0071] Optionally, the first control command is a command signal used to control the output power of the photovoltaic power generation equipment. It contains a specific value of the power adjustment value, instructing the photovoltaic power generation equipment to limit its power generation to the power adjustment value. This command is sent to the power control unit of the photovoltaic power generation equipment through a communication network, and the unit executes the specific power limiting operation.

[0072] S203: When the power adjustment value is not greater than zero, send a second control command to the photovoltaic power generation equipment. The second control command is used to instruct the photovoltaic power generation equipment to shut down.

[0073] In this embodiment, the second control command is a signal used to control the photovoltaic power generation equipment to stop operating. It can be used to instruct the photovoltaic power generation equipment to perform a shutdown operation and completely stop power generation. This command can also be sent to the control unit of the photovoltaic power generation equipment via a communication network to trigger the shutdown process of the photovoltaic power generation equipment.

[0074] In one embodiment provided in this application, based on the above-described scheme, optionally, the process of controlling the energy storage device to perform power compensation for the charging pile is as follows: Figure 3 As shown, it includes:

[0075] S301: Determine the power compensation value based on the power output of the photovoltaic power generation equipment and the current power demand of the charging pile.

[0076] In this embodiment, the power compensation value refers to the compensation power value that the energy storage device needs to provide to make up for the difference between the photovoltaic power generation power and the power demand of the charging pile. This value is obtained by subtracting the real-time power generation power of the photovoltaic power generation device from the current power demand of the charging pile.

[0077] S302: The smaller of the power compensation value and the rated discharge power of the energy storage device shall be used as the target power compensation value.

[0078] Optionally, the rated discharge power refers to the maximum continuous discharge power allowed by the energy storage device under safe operating conditions, which is determined by both the battery characteristics and the power conversion system performance of the energy storage device. By taking the smaller of the two values, it is ensured that the actual discharge power of the energy storage device does not exceed its own safe operating limits, while effectively compensating for the difference between the photovoltaic power generation and the power demand of the charging pile.

[0079] S303: Control the energy storage device to provide power compensation to the charging pile according to the target power compensation value.

[0080] In this embodiment, the control process is achieved by sending a control command containing a target power compensation value to the power control unit of the energy storage device. The power control unit adjusts the actual discharge power of the energy storage device according to the received control command, so that it provides stable power compensation to the charging pile according to the target power compensation value, thereby ensuring that the charging pile obtains a continuous and stable power supply.

[0081] In one embodiment provided in this application, based on the above-described solution, optionally, charging the energy storage device includes:

[0082] Determine the charging power of the energy storage device; the charging power shall not exceed the rated charging power of the energy storage device, and the charging power shall not exceed the difference between the power generation power and the power demand.

[0083] The photovoltaic power generation equipment is used to charge the energy storage equipment based on the charging power control.

[0084] In this embodiment, charging power refers to the electrical power delivered from the photovoltaic power generation device to the energy storage device. The charging power is not greater than the rated charging power of the energy storage device. The rated charging power refers to the maximum continuous charging power value allowed by the energy storage device under safe operating conditions, which is jointly determined by the battery characteristics and power conversion system performance of the energy storage device. Furthermore, the charging power is not greater than the difference between the power generation of the photovoltaic power generation device and the power demand of the charging pile. This difference represents the remaining power generation capacity of the photovoltaic power generation device after meeting the power demand of the charging pile.

[0085] Optionally, a charging control command containing a charging power value is sent to the power control unit of the energy storage device, so that the power control unit adjusts the charging power of the energy storage device according to the received charging control command, thereby realizing the effective storage of the remaining photovoltaic energy.

[0086] In one embodiment provided in this application, based on the above-described solution, optionally, it further includes:

[0087] Obtain the status parameters of the vehicles connected to the charging pile; the status parameters include the current state of charge, the target state of charge, and the allowed charging power.

[0088] The estimated departure time of the vehicle is determined based on the status parameters and the real-time power of the charging pile.

[0089] The charging power allocation for the vehicle is calculated by optimizing the algorithm so that the vehicle's state of charge at the expected departure time is not lower than the vehicle's minimum required state of charge.

[0090] In this embodiment, the estimated departure time refers to the time when the vehicle is scheduled to finish charging. This can be achieved by first determining the difference between the current state of charge (SBC) and the target SBC, and then calculating the estimated departure time based on the charging station's real-time power and this difference. The current SBC refers to the percentage of the vehicle's current remaining battery capacity relative to its rated capacity. The target SBC refers to the SBC value that the user expects to achieve upon departure. The allowable charging power refers to the maximum charging power that the vehicle's battery is allowed to receive.

[0091] Optionally, the optimization algorithm is a mathematical calculation model based on multi-objective optimization theory. This model uses the charging power of each vehicle as the decision variable and maximizing the overall system operating efficiency as the objective function, while simultaneously considering system power balance constraints, energy storage safety constraints, and vehicle charging demand constraints. By solving this optimization model, the optimal charging power allocation scheme for each vehicle at different time periods is obtained. This scheme ensures that the state of charge (SOC) of each vehicle at its expected departure time is not lower than the vehicle's minimum required SOC, which refers to the minimum acceptable departure charge value for the user.

[0092] The method provided in this application embodiment can be applied to the server of a photovoltaic-storage-charging station. The server can acquire device data and device configuration information. Specifically, the server can collect status and real-time data from photovoltaic power generation equipment, energy storage equipment, and charging piles, and upload the collected data to an information platform for storage via 4G IoT card communication. The data collection and upload cycle is once every 30 seconds. Real-time and historical data of the devices can be obtained through the interface provided by the information platform. Optionally, the device configuration information is stored in the server database, including the rated power of photovoltaic power generation, rated power of energy storage, rated power of charging piles, upper limit of energy storage state of charge (second threshold), lower limit of energy storage state of charge (third threshold), and the energy storage state of charge threshold requiring photovoltaic input (first threshold).

[0093] Optionally, at any given time, the energy generated by the power station (photovoltaic power generation) is equal to or greater than the energy consumed (charging consumption + system losses + possible charging of energy storage) or the difference is made up by the discharge of energy storage.

[0094] In this embodiment, since the photovoltaic power generation power fluctuates drastically with weather conditions (sunlight intensity, cloud cover), and the charging power demand of electric vehicles also changes dynamically (vehicle arrival / departure, different battery states), the system must monitor these powers in real time and dynamically adjust the charging power of each vehicle according to preset optimization rules.

[0095] In this embodiment, the following parameters can be perceived and predicted: the real-time state of charge of the energy storage device, the real-time power generation of the photovoltaic power generation device, the photovoltaic power generation in the future (based on weather data and historical data), and the current battery status, target charging amount / target state of charge, maximum / minimum allowed charging power, and expected dwell time of each connected vehicle.

[0096] In this embodiment, based on perceived and predicted data, the system runs an optimization algorithm to calculate the charging power allocated to each vehicle in the current and future periods, in order to achieve the following system objectives: 1. Maximize local photovoltaic consumption: Make the charging power follow the fluctuations of photovoltaic output and prioritize the use of immediate photovoltaic power; 2. Maintain energy storage safety: Avoid overcharging or over-discharging of energy storage; 3. Meet basic user needs: Ensure that the vehicle reaches an acceptable minimum state of charge or target state of charge before leaving; 4. Smooth power fluctuations and extend equipment life: Avoid drastic changes in total charging power; 5. Fairness or priority: Set different priorities based on vehicle status, payment status, arrival time, etc.

[0097] Optionally, the constraints of the optimization algorithm include: total power balance constraints, energy storage system safety constraints, electric vehicle charging constraints, and total power capacity constraints of the power station.

[0098] In this embodiment, the total power balance constraint includes: the sum of photovoltaic power generation and energy storage discharge power equals the sum of all electric vehicle charging power, energy storage charging power, and system loss power. Only one of the energy storage charging power and discharging power can be non-zero at any given time. The total power balance constraint is specifically expressed as follows:

[0099] P_pv(t) + P_discharge_batt(t) = P_charge_total(t) + P_charge_batt(t)+ P_loss(t)

[0100] Where P_pv(t) represents the photovoltaic power generation at time t (kW); P_discharge_batt(t) represents the energy storage discharge power at time t (kW); P_charge_total(t) = Σ P_vehicle_i(t) represents the total charging power of all electric vehicles at time t (kW); P_charge_batt(t) represents the power used to charge the energy storage at time t (kW); and P_loss(t) represents the system loss power at time t (kW).

[0101] Safety constraints for energy storage systems include: a) State of charge range: The state of charge of the energy storage device must be between the preset upper and lower limits; b) Energy storage power limit: The charging power and discharging power must not exceed the maximum allowable value of the device.

[0102] Specifically, the state of charge (SOC) range constraint is expressed as follows:

[0103] SOC_min <= SOC_batt(t) <= SOC_max

[0104] Where SOC_batt(t) represents the state of charge of the stored energy at time t (0%-100%); SOC_min represents the minimum allowable SOC of the stored energy (e.g., 30%); and SOC_max represents the maximum allowable SOC of the stored energy (e.g., 90%).

[0105] Specifically, the energy storage power limit constraints are expressed as follows:

[0106] During charging: 0 <= P_charge_batt(t) <= P_charge_batt_max

[0107] During discharge: 0 <= P_discharge_batt(t) <= P_discharge_batt_max

[0108] Wherein, P_charge_batt_max represents the maximum allowable charging power of energy storage (kW), which is determined by the battery and power converter (PCS) capabilities; P_discharge_batt_max represents the maximum allowable discharging power of energy storage (kW), which is determined by the battery and power converter (PCS) capabilities.

[0109] Electric vehicle charging constraints include: a) Vehicle power limits: The charging power of each vehicle must be within the allowable minimum and maximum power range and not exceed the rated power of the charging station; b) Vehicle energy demand constraints: It must be ensured that the vehicle reaches the minimum acceptable state of charge when it is expected to leave, and reaches the target state of charge as much as possible.

[0110] Specifically, the vehicle power limit constraint is expressed as follows: For each vehicle i, P_min_i <= P_vehicle_i(t) <= P_max_i; where P_vehicle_i(t) represents the charging power (kW) allocated to the i-th vehicle at time t; P_min_i represents the minimum allowed charging power (kW) for the i-th vehicle, set by the vehicle or charging station, below which charging may not be effective or may damage the battery; P_max_i represents the maximum allowed charging power (kW) for the i-th vehicle, determined jointly by the vehicle battery management system (BMS) and the rated power of the charging station.

[0111] Vehicle energy demand constraints are expressed as follows:

[0112] SOC_vehicle_i(T_depart_i) >= SOC_min_acceptable_i;

[0113] SOC_vehicle_i(T_depart_i) >= SOC_target_i;

[0114] SOC_vehicle_i(t+Δt) = SOC_vehicle_i(t) + (η_charge_i * P_vehicle_i(t) * Δt) / E_capacity_i;

[0115] Where T_depart_i represents the expected departure time of the i-th vehicle; SOC_vehicle_i(T_depart_i) represents the state of charge of the i-th vehicle at the departure time; SOC_min_acceptable_i represents the minimum acceptable departure charge (e.g., 30%); SOC_target_i represents the target departure charge (e.g., 80%); η_charge_i represents the charging efficiency of the i-th vehicle (0.0-1.0), taking into account the losses of the charging pile and the on-board charger; Δt represents the time interval (hours); and E_capacity_i represents the total battery capacity (kWh) of the i-th vehicle.

[0116] The total power capacity constraint of the charging station includes: the total charging power of all electric vehicles must not exceed the maximum total charging power that the charging station's charging system can provide. The specific expression of the total power capacity constraint is as follows:

[0117] P_charge_total(t) = Σ P_vehicle_i(t) <= P_station_max

[0118] Wherein, P_station_max represents the maximum total charging power (kW) that the station charging system (including all charging piles, transformers, lines, etc.) can provide.

[0119] In this embodiment, the server can control the optical storage and charging stations in the optical storage and charging field station. The specific steps are as follows:

[0120] 1. Obtain device configuration information and device operation data through services deployed on the server.

[0121] 2. Calculate the difference between the photovoltaic power generation and the charging pile demand power in the power station: Difference between power generation and consumption = Photovoltaic power generation - Charging pile demand power.

[0122] 3. If the real-time state of charge of the energy storage device is less than or equal to the energy storage state of charge threshold required for photovoltaic input, and the photovoltaic restricted power is less than the photovoltaic rated power, then a control command is issued to the photovoltaic power generation device to set the photovoltaic restricted power to the photovoltaic rated power.

[0123] 4. If the photovoltaic power limit is greater than or equal to the photovoltaic rated power, no operation is performed, and the next step is executed.

[0124] 5. If the real-time state of charge of the energy storage device is less than the energy storage state of charge limit and the real-time power of the energy storage is greater than 0 (i.e. the energy storage device is discharging), a control command is sent to the charging pile to set the limited power of the charging pile to the real-time power of the photovoltaic.

[0125] 6. When the real-time state of charge of the energy storage device is between the lower limit of the energy storage state of charge and the threshold of the energy storage state of charge that requires photovoltaic input, and the power of the charging pile is limited to less than the rated power of the charging pile, a control command is sent to the charging pile to set the power of the charging pile to the rated power of the charging pile.

[0126] 7. When the real-time state of charge of the energy storage device is between the energy storage state of charge threshold that requires photovoltaic input and the energy storage state of charge upper limit, a control command is sent to the charging pile to set the charging pile's restricted power to the charging pile's rated power.

[0127] 8. When the real-time state of charge of the energy storage device is greater than or equal to the upper limit of the energy storage state of charge, and the power of the charging pile is limited to less than the rated power of the charging pile, a control command is sent to the charging pile to set the power of the charging pile to the rated power of the charging pile.

[0128] 9. When the real-time state of charge of the energy storage device is greater than or equal to the upper limit of the energy storage state of charge, and the real-time power of the energy storage is less than 0 (i.e. the energy storage device is in charging state), a control command is issued to the photovoltaic power generation device to set the photovoltaic power limit to the difference between the real-time power of the photovoltaic and the power generation and consumption; if the difference is equal to 0, a shutdown command is issued to the photovoltaic power generation device.

[0129] The entire execution process is executed every 30 seconds, providing 24 / 7 real-time monitoring of the photovoltaic power generation equipment, energy storage equipment, and charging piles. Based on the real-time data, the power and status of the equipment are dynamically adjusted to achieve dynamic energy balance within the photovoltaic-storage-charging station.

[0130] and Figure 1 Corresponding to the method described herein, embodiments of this application also provide a power control device for an off-grid photovoltaic energy storage and charging station, used for controlling... Figure 1 The specific implementation of the method is shown in the following structural diagram. Figure 4 As shown, it includes:

[0131] The acquisition unit 401 is used to acquire equipment operation data in the photovoltaic-storage-charging station; the equipment operation data includes the power generation of the photovoltaic power generation equipment, the state of charge of the energy storage equipment, and the power demand of the charging pile.

[0132] The first execution unit 402 is used to control the photovoltaic power generation equipment to supply power to the charging pile and to charge the energy storage equipment according to the required power when the power generation of the photovoltaic power generation equipment is not less than the required power of the charging pile and the state of charge of the energy storage equipment is lower than the first threshold.

[0133] The second execution unit 403 is used to perform a power limiting operation on the photovoltaic power generation equipment when the power generation of the photovoltaic power generation equipment is not less than the power required by the charging pile and the state of charge of the energy storage equipment is greater than a second threshold, so that the power generation of the photovoltaic power generation equipment matches the power required by the charging pile; the second threshold is greater than the first threshold.

[0134] The third execution unit 404 is used to control the photovoltaic power generation equipment to supply power to the charging pile and control the energy storage equipment to compensate the charging pile for power when the power generation of the photovoltaic power generation equipment is less than the power demand of the charging pile and the state of charge of the energy storage equipment is greater than the third threshold. The third threshold is less than the first threshold.

[0135] The fourth execution unit 405 is used to limit the power demand of the charging pile to no higher than the power generation when the power generation of the photovoltaic power generation equipment is less than the power demand of the charging pile and the state of charge of the energy storage equipment is not greater than the third threshold.

[0136] In one embodiment provided in this application, based on the above-described scheme, specifically, the second execution unit includes:

[0137] The first determining subunit is used to determine the power adjustment value based on the power generation capacity of the photovoltaic power generation equipment and the current power demand of the charging pile;

[0138] The first transmitting subunit is used to send a first control command to the photovoltaic power generation equipment when the power adjustment value is greater than zero. The first control command is used to indicate that the power generation of the photovoltaic power generation equipment is limited to the power adjustment value.

[0139] The second transmitting subunit is used to send a second control command to the photovoltaic power generation equipment when the power adjustment value is not greater than zero. The second control command is used to instruct the photovoltaic power generation equipment to shut down.

[0140] In one embodiment provided in this application, based on the above-described scheme, specifically, the third execution unit includes:

[0141] The second determining subunit is used to determine the power compensation value based on the power generation capacity of the photovoltaic power generation equipment and the current power demand of the charging pile;

[0142] The execution subunit is used to take the smaller of the power compensation value and the rated discharge power of the energy storage device as the target power compensation value;

[0143] The power compensation subunit is used to control the energy storage device to provide power compensation to the charging pile according to the target power compensation value.

[0144] The specific principles and execution processes of each unit and module in the power control device of the off-grid optical storage and charging station disclosed in the above-described embodiments of this application are the same as those of the power control method of the off-grid optical storage and charging station disclosed in the above-described embodiments of this application. Please refer to the corresponding parts of the power control method of the off-grid optical storage and charging station provided in the above-described embodiments of this application, and they will not be repeated here.

[0145] This application embodiment also provides a storage medium, which includes stored instructions, wherein, when the instructions are executed, the device where the storage medium is located executes the power control method of the off-grid optical storage and charging station described above.

[0146] This application also provides an electronic device, the structural schematic diagram of which is shown below. Figure 5 As shown, it specifically includes a memory 501 and one or more instructions 502, wherein one or more instructions 502 are stored in the memory 501 and are configured to be executed by one or more processors 503 to execute the power control method of the off-grid optical storage and charging station described above.

[0147] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For apparatus embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0148] Finally, it should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0149] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0150] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0151] The solution provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A power control method for an off-grid photovoltaic energy storage and charging station, characterized in that, include: Acquire equipment operation data in the photovoltaic-storage-charging station; the equipment operation data includes the power generation of the photovoltaic power generation equipment, the state of charge of the energy storage equipment, and the power demand of the charging piles. When the power output of the photovoltaic power generation equipment is not less than the power demand of the charging pile, and the state of charge of the energy storage device is lower than the first threshold, the photovoltaic power generation equipment is controlled to supply power to the charging pile and charge the energy storage device according to the power demand. When the power output of the photovoltaic power generation equipment is not less than the power demand of the charging pile, and the state of charge of the energy storage equipment is greater than a second threshold, a power limiting operation is performed on the photovoltaic power generation equipment to match the power demand of the charging pile; wherein, the second threshold is greater than the first threshold; When the power output of the photovoltaic power generation device is less than the power demand of the charging pile, and the state of charge of the energy storage device is greater than the third threshold, the photovoltaic power generation device is controlled to supply power to the charging pile, and the energy storage device is controlled to perform power compensation for the charging pile. If the power output of the photovoltaic power generation equipment is less than the power demand of the charging pile, and the state of charge of the energy storage equipment is not greater than the third threshold, the power demand of the charging pile shall be limited to not exceed the power output. The third threshold is less than the first threshold.

2. The method according to claim 1, characterized in that, Performing a power limiting operation on the photovoltaic power generation equipment to match the power output of the photovoltaic power generation equipment with the power demand of the charging pile includes: The power adjustment value of the photovoltaic power generation equipment is determined based on the current power demand of the charging pile. When the power adjustment value is greater than zero, a first control command is sent to the photovoltaic power generation equipment, the first control command being used to instruct the power generation of the photovoltaic power generation equipment to be limited to the power adjustment value; When the power adjustment value is not greater than zero, a second control command is sent to the photovoltaic power generation equipment, the second control command being used to instruct the photovoltaic power generation equipment to shut down.

3. The method according to claim 1, characterized in that, The control of the energy storage device to perform power compensation for the charging pile includes: The power compensation value is determined based on the power output of the photovoltaic power generation equipment and the current power demand of the charging pile; The smaller of the power compensation value and the rated discharge power of the energy storage device shall be used as the target power compensation value; The energy storage device is controlled to provide power compensation to the charging pile according to the target power compensation value.

4. The method according to claim 1, characterized in that, The charging of the energy storage device includes: The charging power of the energy storage device is determined; the charging power is not greater than the rated charging power of the energy storage device, and the charging power is not greater than the difference between the power generation power and the power demand. The photovoltaic power generation equipment is controlled to charge the energy storage device according to the charging power.

5. The method according to claim 1, characterized in that, Also includes: Obtain the status parameters of the vehicle connected to the charging pile; the status parameters include the current state of charge, the target state of charge, and the allowed charging power. The estimated departure time of the vehicle is determined based on the status parameters and the real-time power of the charging pile. The charging power allocation of the vehicle is calculated by an optimization algorithm so that the state of charge of the vehicle at the expected departure time is not lower than the minimum required state of charge of the vehicle.

6. A power control device for an off-grid photovoltaic energy storage and charging station, characterized in that, include: The acquisition unit is used to acquire equipment operation data in the photovoltaic-storage-charging station; the equipment operation data includes the power generation of the photovoltaic power generation equipment, the state of charge of the energy storage equipment, and the power demand of the charging pile. The first execution unit is configured to, when the power generation of the photovoltaic power generation equipment is not less than the required power of the charging pile and the state of charge of the energy storage device is lower than a first threshold, control the photovoltaic power generation equipment to supply power to the charging pile and charge the energy storage device according to the required power. The second execution unit is configured to perform a power limiting operation on the photovoltaic power generation equipment when the power generation of the photovoltaic power generation equipment is not less than the required power of the charging pile and the state of charge of the energy storage equipment is greater than a second threshold, so that the power generation of the photovoltaic power generation equipment matches the required power of the charging pile; the second threshold is greater than the first threshold. The third execution unit is configured to control the photovoltaic power generation equipment to supply power to the charging pile and control the energy storage device to perform power compensation for the charging pile when the power generation of the photovoltaic power generation equipment is less than the power demand of the charging pile and the state of charge of the energy storage device is greater than a third threshold, wherein the third threshold is less than the first threshold. The fourth execution unit is used to limit the power demand of the charging pile to no higher than the power generation power when the power generation power of the photovoltaic power generation equipment is less than the power demand of the charging pile and the state of charge of the energy storage equipment is not greater than the third threshold.

7. The apparatus according to claim 6, characterized in that, The second execution unit includes: The first determining subunit is used to determine the power adjustment value of the photovoltaic power generation equipment based on the current power demand of the charging pile; The first transmitting subunit is configured to send a first control command to the photovoltaic power generation device when the power adjustment value is greater than zero. The first control command is configured to instruct the photovoltaic power generation device to limit its power generation to the power adjustment value. The second transmitting subunit is used to send a second control command to the photovoltaic power generation equipment when the power adjustment value is not greater than zero. The second control command is used to instruct the photovoltaic power generation equipment to shut down.

8. The apparatus according to claim 6, characterized in that, The third execution unit includes: The second determining subunit is used to determine the power compensation value based on the power generation capacity of the photovoltaic power generation equipment and the current power demand of the charging pile; An execution subunit is used to take the smaller of the power compensation value and the rated discharge power of the energy storage device as the target power compensation value; A power compensation subunit is used to control the energy storage device to provide power compensation to the charging pile according to the target power compensation value.

9. A storage medium, characterized in that, The storage medium includes stored instructions, wherein, when the instructions are executed, the device containing the storage medium is controlled to perform the power control method of the off-grid optical storage and charging station as described in any one of claims 1 to 5.

10. An electronic device, characterized in that, It includes a memory and one or more instructions, wherein one or more instructions are stored in the memory and configured to be executed by one or more processors as described in any one of claims 1 to 5.

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