Power control method and device of charging station and nonvolatile storage medium

Abstract

The application discloses a power control method and device of a charging station and a nonvolatile storage medium. It relates to the field of power systems, and the method comprises the following steps: acquiring a current photovoltaic output power of a photovoltaic power generation device in the charging station at a current sampling moment, a previous photovoltaic output power at a previous sampling moment, and a previous energy storage power of an energy storage device in the charging station at the previous sampling moment; performing low-pass filtering processing on the previous photovoltaic output power and the previous energy storage power to obtain a target joint operation power corresponding to the current sampling moment; performing difference calculation on the target joint operation power and the current photovoltaic output power to obtain a target energy storage power of the energy storage device; and adjusting the current energy storage power of the energy storage device based on the target energy storage power. The application solves the technical problem of poor power supply stability caused by the fact that, in the related art, factors are not comprehensive when the photovoltaic power generation device and the energy storage device in the charging station jointly charge and supply power.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power systems, in particular to a power control method and device of a charging station and a nonvolatile storage medium. BACKGROUND

[0002] With the large-scale development of electric vehicles, a large number of charging piles of electric vehicles are connected to the power grid, but the existing distribution network, especially in densely populated urban areas, is difficult to support such a large number of charging piles to be connected to the grid at the same time, and the charging of electric vehicles is intermittent and irregular, and the sudden and concentrated charging load and the power grid peak overlap, which easily causes voltage and frequency fluctuations and other problems, and in severe cases, it may cause large-area power failure.

[0003] In related technologies, distributed resources such as photovoltaic energy storage are widely connected to the distribution network to balance the increase in charging load and other problems caused by insufficient power consumption. Since the power generation of photovoltaic power generation equipment is greatly affected by weather and other factors, when severe weather (such as rainy and snowy weather) occurs, the photovoltaic power generation equipment will have power fluctuations, resulting in poor power supply stability. However, when the photovoltaic power generation equipment in the charging station and the photovoltaic energy storage distributed resource equipment jointly supply power to the charging pile, the factors considered are not comprehensive, for example, the power fluctuation of photovoltaic power generation is not considered, which easily causes the mismatch between the scale of photovoltaic energy storage distributed resource equipment and the power consumption load, and problems such as heavy overload of the transformer area and heavy overload of the line occur during operation, which not only affects the power supply stability of the power supply station, but also seriously affects the stability of the power grid.

[0004] In view of the above problems, no effective solution has been proposed so far. SUMMARY

[0005] The embodiments of the present application provide a power control method and device of a charging station and a nonvolatile storage medium to at least solve the technical problem of poor power supply stability caused by the fact that the factors are not comprehensive when the photovoltaic power generation equipment and the energy storage equipment in the charging station jointly charge and supply power.

[0006] According to an aspect of some embodiments of the present application, a power control method of a charging station is provided, comprising: obtaining a current photovoltaic output power of a photovoltaic power generation device in the charging station at a current sampling moment, a previous photovoltaic output power of the photovoltaic power generation device at a previous sampling moment, and a previous energy storage power of an energy storage device in the charging station at the previous sampling moment, wherein the previous sampling moment is a sampling moment before the current sampling moment; performing low-pass filtering processing based on the current photovoltaic output power, the previous photovoltaic output power and the previous energy storage power to obtain a target joint operation power corresponding to the current sampling moment; performing difference calculation on the target joint operation power and the current photovoltaic output power to obtain a target energy storage power of the energy storage device; and adjusting a current energy storage power of the energy storage device at the current sampling moment based on the target energy storage power.

[0007] Optionally, the low-pass filtering processing based on the current photovoltaic output power, the previous photovoltaic output power and the previous energy storage power to obtain the target joint operation power corresponding to the current sampling moment comprises: obtaining a previous joint operation power corresponding to the previous sampling moment based on the previous photovoltaic output power and the previous energy storage power; determining a low-pass filtering coefficient; and performing low-pass filtering processing based on the low-pass filtering coefficient, the current photovoltaic output power and the previous joint operation power to obtain the target joint operation power.

[0008] Optionally, the low-pass filtering processing based on the low-pass filtering coefficient, the current photovoltaic output power and the previous joint operation power to obtain the target joint operation power comprises: performing low-pass filtering processing based on the low-pass filtering coefficient, the current photovoltaic output power and the previous joint operation power to obtain the target joint operation power in the following manner:

[0009] P bessWithPV (i)=(1-α)P bessWithPV (i-1)+α·P PV (i)

[0010] wherein, P bessWithPV (i) represents the target joint operation power at the current sampling moment, α represents the low-pass filtering coefficient, P bessWithPV (i-1) represents the previous joint operation power, P PV (i) represents the current photovoltaic output power, i represents the current sampling moment, and i-1 represents the previous sampling moment.

[0011] Optionally, the adjusting the current energy storage power of the energy storage device at the current sampling moment based on the target energy storage power comprises: detecting whether the target energy storage power is within a first predetermined power range; and in a case where the target energy storage power is within the first predetermined power range, adjusting the current energy storage power of the energy storage device based on the target energy storage power.

[0012] Optionally, the current energy storage power is a current charging power or a current discharging power of the energy storage device at the current sampling moment, the first predetermined power range is less than a first predetermined power or greater than a second predetermined power, and the method further comprises: in a case where the target energy storage power is less than the first predetermined power, adjusting the current charging power of the energy storage device at the current sampling moment based on the target energy storage power, wherein the first predetermined power is an integer less than or equal to 0; or in a case where the target energy storage power is greater than the second predetermined power, adjusting the current discharging power of the energy storage device at the current sampling moment based on the target energy storage power, wherein the second predetermined power is an integer greater than or greater than 0.

[0013] Optionally, in a case where the target energy storage power is less than the first predetermined power, the adjusting the current charging power of the energy storage device at the current sampling moment based on the target energy storage power comprises: in a case where the target energy storage power is less than the first predetermined power, detecting whether the target energy storage power is less than or equal to a preset charging power threshold; and in a case where the target energy storage power is less than or equal to the preset charging power threshold, adjusting the current charging power of the energy storage device based on the target energy storage power; or in a case where the target energy storage power is greater than the second predetermined power, the adjusting the current discharging power of the energy storage device at the current sampling moment based on the target energy storage power comprises: in a case where the target energy storage power is greater than the second predetermined power, detecting whether the target energy storage power is less than or equal to a preset discharging power threshold; and in a case where the target energy storage power is less than or equal to the preset discharging power threshold, adjusting the current discharging power of the energy storage device based on the target energy storage power.

[0014] Optionally, the adjusting the current energy storage power of the energy storage device at the current sampling moment based on the target energy storage power comprises: obtaining a previous energy storage amount of the energy storage device at a previous sampling moment; obtaining a predicted energy storage amount based on the previous energy storage amount and the target energy storage power; detecting whether the predicted energy storage amount is within a predetermined capacity range; and in a case where the predicted energy storage amount is within the predetermined capacity range, adjusting the current energy storage power of the energy storage device based on the target energy storage power.

[0015] According to another aspect of the embodiments of the present application, there is also provided a power control apparatus of a charging station, comprising: an obtaining module configured to obtain a current photovoltaic output power of a photovoltaic power generation device in the charging station at a current sampling moment, a previous photovoltaic output power of the photovoltaic power generation device at a previous sampling moment, and a previous energy storage power of an energy storage device in the charging station at the previous sampling moment, wherein the previous sampling moment is a sampling moment before the current sampling moment; a target joint operation power determination module configured to perform low-pass filtering processing based on the current photovoltaic output power, the previous photovoltaic output power and the previous energy storage power to obtain a target joint operation power corresponding to the current sampling moment; a target energy storage power determination module configured to perform difference calculation on the target joint operation power and the current photovoltaic output power to obtain a target energy storage power of the energy storage device; and an adjusting module configured to adjust a current energy storage power of the energy storage device at the current sampling moment based on the target energy storage power.

[0016] According to another aspect of the embodiments of the present application, there is also provided a non-transitory storage medium storing a plurality of instructions adapted to be loaded and executed by a processor to perform any of the power control methods of the charging station.

[0017] According to another aspect of the embodiments of the present application, there is also provided an electronic device comprising one or more processors and a memory configured to store one or more programs, wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to implement any of the power control methods of the charging station.

[0018] In the embodiment of the present application, by acquiring a current photovoltaic output power of a photovoltaic power generation device in the charging station at a current sampling moment, a previous photovoltaic output power of the photovoltaic power generation device at a previous sampling moment, and a previous energy storage power of an energy storage device in the charging station at the previous sampling moment, wherein the previous sampling moment is a sampling moment before the current sampling moment; based on the current photovoltaic output power, the previous photovoltaic output power and the previous energy storage power, low-pass filtering processing is performed to obtain a target joint operation power corresponding to the current sampling moment; difference calculation is performed on the target joint operation power and the current photovoltaic output power to obtain a target energy storage power of the energy storage device; based on the target energy storage power, a current energy storage power of the energy storage device at the current sampling moment is adjusted. The purpose of compensating for high-frequency components of photovoltaic power based on low-pass filtering processing to make real-time power control of energy storage to compensate for power fluctuations of photovoltaic power generation is achieved, thereby realizing the technical effect of improving power supply stability, and further solving the technical problem of poor power supply stability caused by incomplete consideration of factors in the related art when charging and power supply are jointly performed based on the photovoltaic power generation device and the energy storage device in the charging station. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0020] Figure 1 is a flow chart of a power control method of a charging station according to an embodiment of the present application;

[0021] Figure 2 is a flow chart of an optional power control method of a charging station according to an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of a power control device of a charging station according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should fall within the protection scope of the present application.

[0024] It is to be understood that the terms "first", "second", and the like in the description and in the claims of the present application, as well as above and in the following attached drawings, are used to distinguish between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of data herein so described makes it possible, in appropriate cases, to adapt the embodiment of the application described herein to a sequential or parallel implementation. Furthermore, the terms "comprise" and "comprising" and any variation thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or apparatus that comprises a list of steps or units not necessarily limited to those expressly identified in the specification, but can include other not expressly identified steps or units inherent therein.

[0025] First, for the convenience of understanding the embodiments of the present application, the following will explain some terms or nouns involved in the present application:

[0026] Energy storage power refers to the ability of an energy storage system to input (charge) or output (discharge) power. It can reflect the charging and discharging speed and capacity of the energy storage system, and also determines the output capacity and use range of the energy storage system.

[0027] Low-pass filtering is a signal processing technique used to remove high-frequency components from a signal, making it smoother and slower. In the field of image processing, low-pass filtering can be used to blur images, remove noise, or reduce details. Common low-pass filters include Butterworth filters, elliptical filters, etc. The design and parameter setting of low-pass filters will affect the filtering effect, including cutoff frequency, order, passband ripple, etc.

[0028] Photovoltaic power generation equipment includes a system composed of solar panels, inverters, supports, etc. Through photovoltaic power generation equipment, sunlight can be directly converted into electrical energy, realizing clean and renewable energy utilization.

[0029] Energy storage equipment refers to a system composed of distributed resource equipment for converting, storing, and supplying electrical energy to where it is needed. Such equipment can include solar photovoltaic panels, battery energy storage systems, inverters, etc. According to the embodiments of the present application, a power control method for a charging station is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0030] Figure 1 is a flowchart of the power control method for a charging station according to the embodiments of the present application, as Figure 1 shown, the method comprises the following steps:

[0031] In step S102, the current photovoltaic output power of the photovoltaic power generation device in the charging station at the current sampling moment, the previous photovoltaic output power of the photovoltaic power generation device at the previous sampling moment, and the previous energy storage power of the energy storage device in the charging station at the previous sampling moment are obtained, wherein the previous sampling moment is a sampling moment before the current sampling moment.

[0032] Optionally, the charging station is a facility providing charging services for electric vehicles, electric tricycles, and other electric vehicles. The photovoltaic power generation device and the energy storage device are devices for supplying power to the charging station. The energy storage device is mainly used for storing electric energy, which can be charged when the grid load is low and store electric energy; and discharged to provide electric energy when the grid load is high or the electric vehicle needs to be charged. The energy storage device can effectively alleviate the grid load pressure and improve the stability of the grid. At the same time, during the peak period of electric vehicle charging demand, the energy storage device can release the stored electric energy to provide charging services for electric vehicles, avoiding the sharp increase of grid load. At the same time, the energy storage device can also adjust the charging power according to the actual load condition of the charging station to improve the charging efficiency and speed. The photovoltaic power generation device can convert light energy into electric energy using solar energy. The photovoltaic power generation device has the characteristics of environmental protection, energy saving, and sustainable development, and can directly provide clean electric energy for the charging station. Through the combination of solar power generation and energy storage devices, the charging station is powered to realize efficient use and distribution of electric energy.

[0033] In step S104, low-pass filtering is performed based on the current photovoltaic output power, the previous photovoltaic output power, and the previous energy storage power to obtain a target joint operation power corresponding to the current sampling moment.

[0034] Optionally, low-pass filtering is a signal processing technique used to decouple high-frequency and low-frequency components in photovoltaic output, remove high-frequency components, and retain low-frequency components. Low-pass filtering can be implemented based on a low-pass filter.

[0035] Optionally, since the power generation of the photovoltaic power generation device is greatly affected by weather and other factors, when severe weather (such as rainy and snowy weather) occurs, the photovoltaic power generation device will have power fluctuations, resulting in unstable power supply. When the photovoltaic power generation device and the energy storage device are used to jointly charge and supply power, low-pass filtering can be used to decouple high-frequency and low-frequency components in photovoltaic output. The target joint operation power obtained based on low-pass filtering can be used to control the real-time power of the energy storage device to compensate for the high-frequency components of the photovoltaic power generation device, thereby improving the stability of the charging station and the stability of the grid.

[0036] Optionally, during the low-pass filtering process, the preceding photovoltaic output power and the preceding energy storage power to be processed are first determined, which are the preceding photovoltaic output power and the preceding energy storage power obtained above. A low-pass filter is designed according to actual needs, wherein the filter type and low-pass filter coefficients need to be determined. Then, the preceding photovoltaic output power and the preceding energy storage power are input into the low-pass filter for filtering to remove high-frequency components, thereby obtaining the low-pass filtered preceding photovoltaic output power and the preceding energy storage power. Based on the low-pass filtered preceding photovoltaic output power and the preceding energy storage power, the target combined operating power is obtained. The target combined operating power is the total power supplied by the photovoltaic power generation equipment and the energy storage equipment to the charging piles in the charging station.

[0037] In one optional embodiment, a low-pass filter is performed based on the current photovoltaic output power, the previous photovoltaic output power, and the previous energy storage power to obtain the target combined operating power corresponding to the current sampling time. This includes: obtaining the previous combined operating power corresponding to the previous sampling time based on the previous photovoltaic output power and the previous energy storage power; determining the low-pass filter coefficient; and performing a low-pass filter on the current photovoltaic output power and the previous combined operating power based on the low-pass filter coefficient to obtain the target combined operating power.

[0038] Optionally, the magnitude of the low-pass filter coefficient α affects the filter's performance. A larger α value allows the target opening to be reached faster but results in a less smooth curve, while a smaller α value takes longer to reach the target opening but produces a smoother and more stable curve. The target opening refers to the amount of low-frequency components desired to be retained in the filtered signal. A larger target opening can be set when more low-frequency components are desired, while a smaller target opening can be set when only a small amount of low-frequency components are desired. In practical applications, a suitable α value can also be determined through experiments and simulations based on factors such as the fluctuation characteristics of the current photovoltaic output power, the response speed of the energy storage device, and the grid's requirements for the current photovoltaic output power.

[0039] Specifically, the formula for calculating the low-pass filter coefficient α is as follows:

[0040]

[0041] Where fs is the sampling frequency of the low-pass filter, and τ is the time constant used to describe the response speed of the low-pass filter. Different filtering effects can be achieved by adjusting the value of the coefficient α.

[0042] Optionally, a low-pass filter is determined based on the low-pass filter coefficients. The previously acquired photovoltaic output power and energy storage power are input into the low-pass filter for filtering to remove high-frequency components, thus obtaining the low-pass filtered previous photovoltaic output power and energy storage power. These two low-pass filtered powers are then weighted and summed to obtain the previous combined operating power corresponding to the previous sampling time. The weighting values ​​are determined based on the low-pass filter coefficients. Based on the low-pass filter with determined low-pass filter coefficients, the current photovoltaic output power and the previous combined operating power are simultaneously input into the low-pass filter for low-pass filtering to obtain the final target combined operating power.

[0043] In one optional embodiment, the target joint operating power is obtained by performing low-pass filtering on the current photovoltaic output power and the previous joint operating power based on the low-pass filter coefficient. This includes: performing low-pass filtering on the current photovoltaic output power and the previous joint operating power based on the low-pass filter coefficient, and obtaining the target joint operating power in the following manner:

[0044] P bessWithPV (i)=(1-α)P bessWithPV (i-1)+α·P PV (i)

[0045] Among them, P bessWithPV (i) represents the target joint operating power at the current sampling time, α represents the low-pass filter coefficient, and P bessWithPV (i-1) represents the previous combined operating power, P PV (i) represents the current photovoltaic output power, i represents the current sampling time, and i-1 represents the previous sampling time.

[0046] Optionally, based on the low-pass filter coefficient, a low-pass filter is determined. The current photovoltaic output power and the previous combined operating power are simultaneously input to the low-pass filter. The current photovoltaic output power is used as the input signal for low-pass filtering. The previous combined operating power and the current photovoltaic output power are weighted and added together using the low-pass filter coefficient as the weighting value to obtain the final target combined operating power.

[0047] Step S106: Calculate the difference between the target combined operating power and the current photovoltaic output power to obtain the target energy storage power of the energy storage device;

[0048] Optionally, the target combined operating power is the total power supplied by the photovoltaic power generation equipment and the energy storage equipment to the charging piles in the charging station. Since the current photovoltaic output power is obtained in real time, the target energy storage power of the energy storage equipment is also obtained in real time after subtracting the target combined operating power from the current photovoltaic output power. The target energy storage power of the energy storage equipment is the energy storage power required to compensate for the high-frequency components of the photovoltaic power generation equipment.

[0049] Target energy storage capacity P bess The specific calculation method for (i) is as follows.

[0050] P bess (i)=P bessWithPV (i)-P PV (i)

[0051] Step S108: Based on the target energy storage power, adjust the current energy storage power of the energy storage device at the current sampling time.

[0052] It is understandable that the target energy storage power is the energy storage power required to compensate for the high-frequency components of photovoltaic power generation equipment. Adjusting the energy storage equipment based on the target energy storage power can compensate for the high-frequency components of photovoltaic power generation equipment, thereby improving the power supply stability of charging stations and the operation stability of the power grid.

[0053] In one optional embodiment, adjusting the current energy storage power of the energy storage device at the current sampling time based on the target energy storage power includes: detecting whether the target energy storage power is within a first predetermined power range; and if the target energy storage power is within the first predetermined power range, adjusting the current energy storage power of the energy storage device based on the target energy storage power.

[0054] Optionally, the first predetermined power range can be understood as the power range capable of maintaining the safe and stable operation of the energy storage device. By determining whether the target energy storage power is within the first predetermined power range, it can be determined whether the energy storage device can maintain safe and stable operation under the target energy storage power. If the target energy storage power is within the first predetermined power range, it indicates that the energy storage device can maintain safe and stable operation under the target energy storage power. In this case, the current energy storage power of the energy storage device can be adjusted to the target energy storage power. If the target energy storage power is not within the first predetermined power range, there is no need to adjust the current energy storage power of the energy storage device to the target energy storage power, thereby avoiding affecting the actual operation of the energy storage device. Through the above method, not only can the high-frequency components of the photovoltaic power generation equipment be compensated, but the safe and stable operation of the energy storage device can also be ensured.

[0055] Optionally, after the current photovoltaic output power of the photovoltaic power generation equipment is low-pass filtered, the high-frequency components and low-frequency components are separated. Based on the obtained target energy storage power, the changes in the high-frequency components of the photovoltaic power generation equipment are compensated. In this way, by adjusting the current energy storage power of the energy storage equipment, the overall output power fluctuation of the photovoltaic power generation equipment is reduced, and the current photovoltaic output power of the photovoltaic power generation equipment can stably supply power to the charging pile.

[0056] In one optional embodiment, the current energy storage power is the current charging power or current discharging power of the energy storage device at the current sampling time, and the first predetermined power range is less than the first predetermined power or greater than the second predetermined power. The method further includes: if the target energy storage power is less than the first predetermined power, adjusting the current charging power of the energy storage device at the current sampling time based on the target energy storage power, wherein the first predetermined power is an integer less than or equal to 0; or if the target energy storage power is greater than the second predetermined power, adjusting the current discharging power of the energy storage device at the current sampling time based on the target energy storage power, wherein the second predetermined power is an integer greater than or greater than 0.

[0057] Optionally, based on the target energy storage power, the current energy storage power in the energy storage device can be adjusted to match the target energy storage power by controlling the energy storage device. The energy storage device includes both charging and discharging processes; therefore, the corresponding current energy storage power includes both charging and discharging power. When the output power of the photovoltaic power generation device is high, and there is still residual power after fully responding to the power supply from the charging pile, the energy storage device will respond to the charging process, storing the residual power of the photovoltaic power generation device. When the photovoltaic power generation device cannot fully respond to the power supply from the charging pile, the energy storage device will respond to the discharging process, supplying power to the charging pile.

[0058] Optionally, based on the value of the target energy storage power, it is determined whether to adjust the current energy storage power of the energy storage device at the current sampling time. When the target energy storage power is positive (greater than 0), it indicates that the current photovoltaic output power fluctuates greatly and shows an upward trend. At this time, the energy storage device discharges to compensate for the power supply of the charging pile. When the target energy storage power is negative (less than 0), it indicates that the current photovoltaic output power fluctuates greatly and shows a downward trend. At this time, the energy storage device charges to absorb the remaining power for storage.

[0059] In one optional embodiment, when the target energy storage power is less than a first predetermined power, adjusting the current charging power of the energy storage device at the current sampling time based on the target energy storage power includes: when the target energy storage power is less than the first predetermined power, detecting whether the target energy storage power is less than or equal to a preset charging power threshold; when the target energy storage power is less than or equal to the preset charging power threshold, adjusting the current charging power of the energy storage device based on the target energy storage power; or when the target energy storage power is greater than a second predetermined power, adjusting the current discharging power of the energy storage device at the current sampling time based on the target energy storage power includes: when the target energy storage power is greater than the second predetermined power, detecting whether the target energy storage power is less than or equal to a preset discharging power threshold; when the target energy storage power is less than or equal to the preset discharging power threshold, adjusting the current discharging power of the energy storage device based on the target energy storage power.

[0060] Optionally, if the target energy storage power is less than the first preset power, it indicates that the current photovoltaic output power is fluctuating greatly and showing a downward trend. In this case, the energy storage device is adjusted to charge in order to absorb the surplus power of the photovoltaic power generation device other than the power supplied to the charging pile for storage. At this time, if the target energy storage power is less than or equal to the preset charging power threshold, the current charging power of the energy storage device can be adjusted to adapt to the charging process of the energy storage device. The preset charging power threshold can be understood as the maximum charging power of the energy storage battery.

[0061] Optionally, if the target energy storage power is greater than the second preset power, it indicates that the current photovoltaic output power is fluctuating significantly and showing an upward trend. In this case, the energy storage device is adjusted to discharge, thereby compensating for the insufficient power supply of the charging pile. In this case, if the target energy storage power is less than or equal to the preset discharge power threshold, the current discharge power of the energy storage device can be adjusted to adapt to the discharge process of the energy storage device. The preset discharge power threshold can be understood as the maximum charging power of the energy storage battery.

[0062] Optionally, the maximum discharge power that the energy storage device can output to the charging pile or the maximum charging power it can receive can be preset. This is an important performance indicator of the energy storage device, used to ensure that the energy storage device can charge and discharge quickly and effectively when needed. When adjusting the current energy storage power of the energy storage device, its maximum charging and discharging power needs to be known to avoid overloading or low operating efficiency of the energy storage device.

[0063] In one optional embodiment, adjusting the current energy storage power of the energy storage device at the current sampling time based on the target energy storage power includes: obtaining the previous energy storage of the energy storage device at the previous sampling time; obtaining the predicted energy storage based on the previous energy storage and the target energy storage power; detecting whether the predicted energy storage is within a predetermined capacity range; and adjusting the current energy storage power of the energy storage device based on the target energy storage if the predicted energy storage is within the predetermined capacity range.

[0064] Optionally, based on the magnitude of the low-frequency components of the photovoltaic power generation equipment and the predetermined capacity range of the energy storage equipment, the compensation power required by the energy storage equipment, i.e., the target energy storage power, can be obtained. Then, based on the target energy storage power, the charging and discharging power of the energy storage equipment, i.e., the current energy storage power, can be controlled to achieve a smooth increase and decrease in the photovoltaic power generation equipment's capacity. The predetermined capacity range is between the maximum capacity and the minimum capacity of the energy storage equipment.

[0065] Optionally, the maximum capacity is the maximum electrical energy that the energy storage device can store. This is a crucial parameter for the design and operation of energy storage devices, ensuring that they do not exceed their safe storage limits. When controlling the current energy storage power, it is necessary to base it on the device's maximum capacity to prevent overcharging or discharging, thereby protecting the device's safety and extending its lifespan. The minimum capacity is the minimum electrical energy that the energy storage device should maintain, ensuring it has sufficient power to handle emergencies or meet specific operational needs. When controlling the current energy storage power, it is necessary to avoid its capacity becoming too low to maintain system stability and reliability.

[0066] Optionally, the predicted energy storage reflects the current state of electrical energy storage in the energy storage device. This is a key parameter for real-time control of the energy storage device, used to determine its charging and discharging strategy. When compensating for high-frequency photovoltaic components, it is necessary to obtain the predicted energy storage of the energy storage device to determine whether to charge or discharge, and the magnitude of the charging and discharging power. This allows for accurate adjustment of the current energy storage power of the energy storage device.

[0067] Through the above steps S102 to S108, the real-time power compensation of photovoltaics based on low-pass filtering can be achieved to compensate for the power fluctuations in photovoltaic power generation, thereby improving the technical effect of power supply stability. This solves the technical problem of poor power supply stability caused by incomplete consideration of factors when photovoltaic power generation equipment and energy storage equipment in charging stations are used for charging and power supply in related technologies.

[0068] Based on the above embodiments and optional embodiments, the present invention proposes an optional implementation method. Figure 2 This is a flowchart of an optional power control method for a charging station according to an embodiment of the present invention, such as... Figure 2As shown, the method includes:

[0069] Step S1: Determine the output power fluctuation control principles and objectives of the photovoltaic power generation equipment in the charging station: Use low-pass filtering to reduce the fluctuations in the current photovoltaic output power during rises and falls.

[0070] Step S2, Data Acquisition: Acquire the low-pass filter coefficient α; acquire the current photovoltaic output power and relevant variable parameters (maximum capacity, minimum capacity, real-time capacity, maximum charge / discharge power) of the energy storage device at the current sampling time of the transformer area.

[0071] Step S3, update data: acquire and adjust the low-pass filter coefficient, current photovoltaic output power, and relevant variable parameters in the energy storage device at a rate of seconds, and update all the above data every second.

[0072] Step S4, calculate the target energy storage power in the energy storage device:

[0073] Calculate the target energy storage capacity using the following formula:

[0074] P bessWithPV (i)=(1-α)P bessWithPV (i-1)+α·P PV (i)

[0075] P bess (i)=P bessWithPV (i)-P PV (i)

[0076] Where: P bessWithPV (i) represents the target combined operating power at the current sampling time (i), which is the total power supplied by the energy storage device and the photovoltaic power generation device to the charging piles in the charging station. bessWithPV (i-1) represents the previous combined operating power, P PV (i) represents the current photovoltaic output power, i represents the current sampling time, and i-1 represents the previous sampling time; P PV (i) represents the current photovoltaic output power at the current sampling time; P bess (i) represents the target energy storage power at the current sampling time.

[0077] Step S5: Based on the target energy storage power, adjust the current energy storage power of the energy storage device by controlling the power grid.

[0078] Step S6: Output the target energy storage power and current energy storage power of the energy storage device during the fluctuation smoothing process. Statistical charts are used to display the charging and discharging power statistics of the energy storage device during the long-term fluctuation smoothing process, which is used to assess the impact of the adjustment process on the lifespan of the energy storage device. Statistical charts are also used to display the data of the energy storage device during the fluctuation smoothing process, which is used to assess whether the energy storage configuration and its initial charge setting are reasonable.

[0079] In this embodiment, based on low-pass filtering, the high-frequency and low-frequency components in the photovoltaic power generation equipment are decoupled. By controlling the current energy storage power of the energy storage equipment, the high-frequency components of the photovoltaic power generation equipment are compensated, so as to achieve a smooth rise and fall of the current photovoltaic output power of the photovoltaic power generation equipment, thereby effectively reducing the impact on the power grid.

[0080] This embodiment also provides a power control device for a charging station, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the terms "module" and "device" can refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0081] According to an embodiment of the present invention, an apparatus embodiment for implementing the power control method of the above-described charging station is also provided. Figure 3 This is a schematic diagram of the structure of a power control device for a charging station according to an embodiment of the present invention, as shown below. Figure 3 As shown, the power control device for the aforementioned charging station includes: an acquisition module 301, a target joint operation power determination module 302, a target energy storage power determination module 303, and an adjustment module 304, wherein:

[0082] The acquisition module 301 is used to acquire the current photovoltaic output power of the photovoltaic power generation equipment in the charging station at the current sampling time, the previous photovoltaic output power of the photovoltaic power generation equipment at the previous sampling time, and the previous energy storage power of the energy storage equipment in the charging station at the previous sampling time, wherein the previous sampling time is the sampling time before the current sampling time.

[0083] The target joint operating power determination module 302 is connected to the acquisition module 301 and is used to perform low-pass filtering based on the current photovoltaic output power, the previous photovoltaic output power and the previous energy storage power to obtain the target joint operating power corresponding to the current sampling time.

[0084] The target energy storage power determination module 303 is connected to the target joint operation power determination module 302 and is used to calculate the difference between the target joint operation power and the current photovoltaic output power to obtain the target energy storage power of the energy storage device.

[0085] The adjustment module 304 is connected to the target energy storage power determination module 303 and is used to adjust the current energy storage power of the energy storage device at the current sampling time based on the target energy storage power.

[0086] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0087] It should be noted that the acquisition module 301, the target joint operating power determination module 302, the target energy storage power determination module 303, and the adjustment module 304 mentioned above correspond to steps S102 to S108 in the embodiments. The instances and application scenarios implemented by the above modules and their corresponding steps are the same, but are not limited to the content disclosed in the above embodiments. It should be noted that the above modules, as part of the device, can run on a computer terminal.

[0088] It should be noted that the optional or preferred implementation methods of this embodiment can be found in the relevant descriptions in the embodiments, and will not be repeated here.

[0089] The power control device of the charging station mentioned above may also include a processor and a memory. The acquisition module 301, the target joint operation power determination module 302, the target energy storage power determination module 303, the adjustment module 304, etc. are all stored in the memory as program modules. The processor executes the program modules stored in the memory to realize the corresponding functions.

[0090] The processor contains a core that retrieves the corresponding program modules from memory. One or more cores may be configured. Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory includes at least one memory chip.

[0091] According to an embodiment of this application, an embodiment of a non-volatile storage medium is also provided. Optionally, in this embodiment, the non-volatile storage medium includes a stored program, wherein, when the program is running, it controls the device containing the non-volatile storage medium to execute any of the power control methods for a charging station.

[0092] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any mobile terminal in a group of mobile terminals, and the non-volatile storage medium includes stored programs.

[0093] Optionally, during program execution, the device containing the non-volatile storage medium may be controlled to perform the following functions: obtain the current photovoltaic output power of the photovoltaic power generation equipment in the charging station at the current sampling time, the previous photovoltaic output power of the photovoltaic power generation equipment at the previous sampling time, and the previous energy storage power of the energy storage equipment in the charging station at the previous sampling time, wherein the previous sampling time is the sampling time before the current sampling time; perform low-pass filtering based on the current photovoltaic output power, the previous photovoltaic output power, and the previous energy storage power to obtain the target combined operating power corresponding to the current sampling time; calculate the difference between the target combined operating power and the current photovoltaic output power to obtain the target energy storage power of the energy storage equipment; and adjust the current energy storage power of the energy storage equipment at the current sampling time based on the target energy storage power.

[0094] According to an embodiment of this application, an embodiment of a processor is also provided. Optionally, in this embodiment, the processor is used to run a program, wherein the program executes any of the power control methods for charging stations described above.

[0095] According to an embodiment of this application, an embodiment of a computer program product is also provided, which, when executed on a data processing device, is adapted to execute a program that initializes the power control method steps of a charging station having any of the above-described steps.

[0096] Optionally, when the aforementioned computer program product is executed on a data processing device, it is suitable to execute an initialization program with the following method steps: obtaining the current photovoltaic output power of the photovoltaic power generation equipment in the charging station at the current sampling time, the previous photovoltaic output power of the photovoltaic power generation equipment at the previous sampling time, and the previous energy storage power of the energy storage equipment in the charging station at the previous sampling time, wherein the previous sampling time is the sampling time before the current sampling time; performing low-pass filtering based on the current photovoltaic output power, the previous photovoltaic output power, and the previous energy storage power to obtain the target combined operating power corresponding to the current sampling time; calculating the difference between the target combined operating power and the current photovoltaic output power to obtain the target energy storage power of the energy storage equipment; and adjusting the current energy storage power of the energy storage equipment at the current sampling time based on the target energy storage power.

[0097] This invention provides an electronic device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps: acquiring the current photovoltaic output power of a photovoltaic power generation device in a charging station at the current sampling time, the previous photovoltaic output power of the photovoltaic power generation device at the previous sampling time, and the previous energy storage power of an energy storage device in the charging station at the previous sampling time, wherein the previous sampling time is the sampling time prior to the current sampling time; performing low-pass filtering on the current photovoltaic output power, the previous photovoltaic output power, and the previous energy storage power to obtain the target combined operating power corresponding to the current sampling time; calculating the difference between the target combined operating power and the current photovoltaic output power to obtain the target energy storage power of the energy storage device; and adjusting the current energy storage power of the energy storage device at the current sampling time based on the target energy storage power.

[0098] The order of the above embodiments of the present invention is merely for description and does not represent the superiority or inferiority of the embodiments.

[0099] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0100] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of modules described above can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between modules, and may be electrical or other forms.

[0101] The modules described above as separate components may or may not be physically separate. Similarly, the components shown as modules may or may not be physical modules; they may be located in one place or distributed across multiple modules. Some or all of the modules can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0102] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0103] If the aforementioned integrated modules are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable non-volatile storage medium. Based on this understanding, the technical solution of this invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a non-volatile storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned non-volatile storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0104] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A power control method for a charging station, characterized in that, include: The current photovoltaic output power of the photovoltaic power generation equipment in the charging station at the current sampling time, the previous photovoltaic output power of the photovoltaic power generation equipment at the previous sampling time, and the previous energy storage power of the energy storage equipment in the charging station at the previous sampling time are obtained, wherein the previous sampling time is the sampling time before the current sampling time. Based on the current photovoltaic output power, the previous photovoltaic output power and the previous energy storage power are low-pass filtered to obtain the target combined operating power corresponding to the current sampling time. This includes: inputting the previous photovoltaic output power and the previous energy storage power into a low-pass filter for filtering, obtaining the low-pass filtered previous photovoltaic output power and the low-pass filtered previous energy storage power; weighted summing the low-pass filtered previous photovoltaic output power and the low-pass filtered previous energy storage power to obtain the previous combined operating power corresponding to the previous sampling time; the low-pass filter coefficients are determined as follows: ,in, Here, fs is the sampling frequency of the low-pass filter, and τ is a time constant used to describe the response speed of the low-pass filter. Based on the low-pass filter coefficients, the current photovoltaic output power and the previous combined operating power are subjected to low-pass filtering processing to obtain the target combined operating power in the following manner: ;in, This represents the target joint operating power at the current sampling time. This represents the low-pass filter coefficient. This indicates the power of the previous joint operation. The current photovoltaic output power is represented by i, the current sampling time is represented by i-1, and the previous sampling time is represented by i-1. The target energy storage power of the energy storage device is obtained by calculating the difference between the target combined operating power and the current photovoltaic output power. Adjusting the current energy storage power of the energy storage device at the current sampling time based on the target energy storage power includes: obtaining the previous energy storage capacity of the energy storage device at the previous sampling time; obtaining the predicted energy storage capacity based on the previous energy storage capacity and the target energy storage power; detecting whether the predicted energy storage capacity is within a predetermined capacity range; and adjusting the current energy storage power of the energy storage device based on the target energy storage power if the predicted energy storage capacity is within the predetermined capacity range.

2. The method according to claim 1, characterized in that, Adjusting the current energy storage power of the energy storage device at the current sampling time based on the target energy storage power includes: Detect whether the target energy storage power is within a first predetermined power range; If the target energy storage power is within the first predetermined power range, the current energy storage power of the energy storage device is adjusted based on the target energy storage power.

3. The method according to claim 2, characterized in that, The current energy storage power is the current charging power or current discharging power of the energy storage device at the current sampling time, and the first predetermined power range is less than a first predetermined power or greater than a second predetermined power. The method further includes: If the target energy storage power is less than the first predetermined power, the current charging power of the energy storage device at the current sampling time is adjusted based on the target energy storage power, wherein the first predetermined power is an integer less than or equal to 0; or If the target energy storage power is greater than the second predetermined power, the current discharge power of the energy storage device at the current sampling time is adjusted based on the target energy storage power, wherein the second predetermined power is an integer greater than or greater than 0.

4. The method according to claim 3, characterized in that, When the target energy storage power is less than the first predetermined power, adjusting the current charging power of the energy storage device at the current sampling time based on the target energy storage power includes: when the target energy storage power is less than the first predetermined power, detecting whether the target energy storage power is less than or equal to a preset charging power threshold; when the target energy storage power is less than or equal to the preset charging power threshold, adjusting the current charging power of the energy storage device based on the target energy storage power; or When the target energy storage power is greater than the second predetermined power, the current discharge power of the energy storage device at the current sampling time is adjusted based on the target energy storage power, including: when the target energy storage power is greater than the second predetermined power, detecting whether the target energy storage power is less than or equal to a preset discharge power threshold; when the target energy storage power is less than or equal to the preset discharge power threshold, adjusting the current discharge power of the energy storage device based on the target energy storage power.

5. A power control device for a charging station, characterized in that, include: The acquisition module is used to acquire the current photovoltaic output power of the photovoltaic power generation equipment in the charging station at the current sampling time, the previous photovoltaic output power of the photovoltaic power generation equipment at the previous sampling time, and the previous energy storage power of the energy storage equipment in the charging station at the previous sampling time, wherein the previous sampling time is the sampling time before the current sampling time. The target joint operating power determination module is used to perform low-pass filtering on the current photovoltaic output power, the previous photovoltaic output power, and the previous energy storage power to obtain the target joint operating power corresponding to the current sampling time. This includes: inputting the previous photovoltaic output power and the previous energy storage power into a low-pass filter for filtering to obtain the low-pass filtered previous photovoltaic output power and the low-pass filtered previous energy storage power; performing a weighted summation of the low-pass filtered previous photovoltaic output power and the low-pass filtered previous energy storage power to obtain the previous joint operating power corresponding to the previous sampling time; and determining the low-pass filter coefficients using the following method: ,in, Here, fs is the sampling frequency of the low-pass filter, and τ is a time constant used to describe the response speed of the low-pass filter. Based on the low-pass filter coefficients, the current photovoltaic output power and the previous combined operating power are subjected to low-pass filtering processing to obtain the target combined operating power in the following manner: ;in, This represents the target joint operating power at the current sampling time. This represents the low-pass filter coefficient. This indicates the power of the previous joint operation. The current photovoltaic output power is represented by i, the current sampling time is represented by i-1, and the previous sampling time is represented by i-1. The target energy storage power determination module is used to calculate the difference between the target combined operating power and the current photovoltaic output power to obtain the target energy storage power of the energy storage device. An adjustment module is configured to adjust the current energy storage power of the energy storage device at the current sampling time based on the target energy storage power, including: obtaining the previous energy storage capacity of the energy storage device at the previous sampling time; obtaining a predicted energy storage capacity based on the previous energy storage capacity and the target energy storage power; detecting whether the predicted energy storage capacity is within a predetermined capacity range; and adjusting the current energy storage power of the energy storage device based on the target energy storage power if the predicted energy storage capacity is within the predetermined capacity range.

6. A non-volatile storage medium, characterized in that, The non-volatile storage medium stores multiple instructions, which are adapted to be loaded by a processor and executed by the power control method of the charging station according to any one of claims 1 to 4.

7. An electronic device, characterized in that, It includes one or more processors and a memory, the memory being used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors cause the one or more processors to implement the power control method for a charging station according to any one of claims 1 to 4.

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