Energy scheduling method for a storage charging system

Abstract

This application provides an energy scheduling method for a charging and energy storage system, including determining whether the requested charging power and the first upper limit power of the charging pile are greater than a preset charging power. When both the requested charging power and the first upper limit power are greater than the preset charging power, and when the cell temperature of the energy storage device is not lower than the upper limit temperature, the maximum charging and discharging power corresponding to the cell temperature in the power-temperature mapping relationship is used as the first real-time power, and the difference between the preset charging power and the first real-time power is used as the second real-time power. The energy storage device discharges to the charging pile based on the first real-time power, and the energy storage converter transmits power to the charging pile based on the second real-time power. This energy scheduling method for the charging and energy storage system can ensure charging efficiency while avoiding the use of high-power liquid chillers in the system, thereby reducing the development material costs, installation and commissioning costs, and operation and maintenance costs of the system. Furthermore, the system has a small footprint, high deployment flexibility, and ensures operational efficiency and performance.

Description

Technical Field

[0001] This application relates to the field of power dispatching technology, specifically to an energy dispatching method for a power storage and charging system. Background Technology

[0002] Against the backdrop of the rapid development of the energy storage industry, related supporting equipment has also emerged, which are combined into different types of energy storage and charging systems. These systems are used to supply the electrical energy stored in the energy storage devices to electric vehicles through charging piles, enabling the electric vehicles to charge quickly.

[0003] Most current energy storage and charging systems charge electric vehicles by using the preset discharge power of the battery cells, such as 1P discharge, through related DC / DC modules. However, the battery cells generate a lot of heat when discharging at a higher preset discharge power. When energy dispatching methods are applied to energy storage and charging systems, the power of the liquid cooler in the liquid cooling system needs to be increased. However, increasing the power of the liquid cooler will increase the size of the liquid cooling system, which in turn will increase the size of the entire energy storage and charging system. This increases the development material costs, installation and commissioning costs, and operation and maintenance costs of the product, resulting in drawbacks such as increased space occupation and reduced deployment flexibility. In addition, the increased size of the energy storage and charging system may also lead to a decrease in operating efficiency and performance, such as reduced energy efficiency, increased heat dissipation pressure, and slower response speed, thus reducing the product's market competitiveness. Summary of the Invention

[0004] This application addresses the problems existing in the prior art by providing an energy scheduling method for a storage and charging system that ensures charging efficiency while avoiding the use of high-power liquid chillers. This energy scheduling method can reduce the development material costs, installation and commissioning costs, and operation and maintenance costs of the storage and charging system. Furthermore, the storage and charging system has a small footprint, high deployment flexibility, and ensures operational efficiency and performance.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: An energy dispatching method for a storage and charging system, the storage and charging system including energy storage equipment, charging piles and energy storage converters, the energy dispatching method including: It is determined whether the requested charging power and the first upper limit power of the charging pile are greater than the preset charging power. The first upper limit power represents the maximum discharge power of the energy storage device. When both the requested charging power and the first upper limit power are greater than the preset charging power, determine whether the cell temperature of the energy storage device is not less than the upper limit temperature of the energy storage device. When the cell temperature is not lower than the upper limit temperature, the maximum charging and discharging power corresponding to the cell temperature in the power temperature mapping relationship is taken as the first real-time power, and the difference between the preset charging power and the first real-time power is taken as the second real-time power. The power temperature mapping relationship represents the mapping relationship between the maximum charging and discharging power of the energy storage device and the cell temperature. The first real-time power represents the real-time discharge power of the energy storage device to the charging pile, and the second real-time power represents the real-time transmission power of the energy storage converter. The system controls the energy storage device to discharge to the charging pile based on a first real-time power, and controls the energy storage converter to transmit power to the charging pile based on a second real-time power.

[0006] In some embodiments, the energy dispatching method further includes: when the requested charging power is greater than a preset charging power and the first upper limit power is not greater than the preset charging power, determining whether the sum of the first upper limit power and the second upper limit power is greater than the preset charging power, wherein the second upper limit power represents the maximum power of the energy storage converter; When the sum of the first upper limit power and the second upper limit power is greater than the preset charging power, determine whether the cell temperature is lower than the upper limit temperature; When the cell temperature is lower than the upper limit temperature, the first upper limit power is used as the first real-time power, and the difference between the preset charging power and the first upper limit power is used as the second real-time power. When the cell temperature is not lower than the upper limit temperature, the maximum charging and discharging power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the first real-time power, and the difference between the preset charging power and the first real-time power is taken as the second real-time power.

[0007] In some embodiments, the energy dispatching method further includes: acquiring the state of charge of the energy storage device; When the state of charge is lower than the minimum state of charge at which the energy storage device is cut off from discharge, the first real-time power is controlled to be 0. Determine whether the second upper limit power is greater than the preset charging power; When the second upper limit power is greater than the preset charging power, the preset charging power will be used as the second real-time power.

[0008] In some embodiments, the energy scheduling method further includes: when the second upper limit power is not greater than the preset charging power, using the second upper limit power as the second real-time power.

[0009] In some embodiments, the energy scheduling method further includes: determining whether the power allocation priority of the energy storage and charging system is priority for charging piles; When the power allocation priority is charging pile priority, it is determined whether the charging pile requests charging and whether the power grid requests peak shaving from the energy storage and charging system. When a charging pile requests charging and the power grid requests peak shaving from the energy storage and charging system; Determine whether the requested charging power and the first upper limit power are greater than the preset charging power; When both the requested charging power and the first upper limit power are greater than the preset charging power, the second real-time power is controlled to be 0, and it is determined whether the cell temperature is lower than the upper limit temperature. When the cell temperature is lower than the upper limit temperature, the preset charging power will be used as the first real-time power. When the cell temperature is not lower than the upper limit temperature, the maximum charging and discharging power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the first real-time power. The system controls the energy storage device to discharge to the charging pile based on a first real-time power, and controls the energy storage converter to transmit power to the grid based on a second real-time power.

[0010] In some embodiments, the energy scheduling method further includes: when the requested charging power is not greater than the preset charging power and the first upper limit power is greater than the preset charging power, determining whether the cell temperature is less than the upper limit temperature; When the cell temperature is lower than the upper limit temperature, the requested charging power is used as the first real-time power, and the difference between the preset charging power and the requested charging power is used as the second real-time power. When the cell temperature is not lower than the upper limit temperature, the maximum charging and discharging power corresponding to the cell temperature in the power-temperature mapping relationship is used as the first real-time power, and the second real-time power is obtained based on the power reduction strategy. The second real-time power characterization is obtained based on the power reduction strategy, and the second real-time power is reduced at a preset rate until the second real-time power is 0.

[0011] In some embodiments, the energy dispatching method further includes: when the charging pile does not request charging and the power grid requests peak shaving from the energy storage and charging system, controlling the first real-time power to be 0, and determining whether the second upper limit power is greater than the requested charging power, wherein the second upper limit power represents the maximum power of the energy storage converter; When the second upper limit power is greater than the requested charging power, the requested charging power will be used as the second real-time power. When the second upper limit power is not greater than the requested charging power, the second upper limit power is used as the second real-time power.

[0012] In some embodiments, the energy dispatch method further includes: when the power allocation priority is non-charging pile priority, determining whether the charging pile requests charging and whether the power grid requests peak shaving from the energy storage and charging system, respectively. When a charging pile requests charging and the power grid requests peak shaving from the energy storage and charging system, it is determined whether the cell temperature is lower than the upper limit temperature. When the cell temperature is lower than the upper limit temperature, the difference between the first upper limit power and the second upper limit power is taken as the first real-time power, and the second upper limit power is taken as the second real-time power. The second upper limit power represents the maximum power of the energy storage converter. When the cell temperature is not lower than the upper limit temperature, the maximum charge and discharge power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the real-time maximum discharge power of the energy storage device. Determine whether the real-time maximum discharge power is greater than the second upper limit power; When the real-time maximum discharge power is greater than the second upper limit power, the difference between the real-time maximum discharge power and the second upper limit power is taken as the first real-time power, and the second upper limit power is taken as the second real-time power.

[0013] In some embodiments, the energy scheduling method further includes: when the real-time maximum discharge power is not greater than the second upper limit power, controlling the first real-time power to be 0, and using the real-time maximum discharge power as the second real-time power.

[0014] In some embodiments, when the charging pile does not request charging and the power grid requests peak shaving from the energy storage and charging system, the first real-time power is controlled to be 0, and it is determined whether the cell temperature is lower than the upper limit temperature. When the cell temperature is lower than the upper limit temperature, the second upper limit power is used as the second real-time power.

[0015] Compared with the prior art, this application has the following advantages: This application achieves continuous charging at a preset charging power by having the energy storage device discharge to the charging pile at a preset charging power when the cell temperature is below the upper limit temperature, and by having the energy storage converter supplement the output to the charging pile when the cell temperature is not below the upper limit temperature. This allows the device requesting charging to always charge at a preset charging power through the energy storage and charging system during the charging process. Continuous charging at the preset charging power can be achieved using a relatively low-power liquid cooler, ensuring charging efficiency while avoiding the use of high-power liquid coolers. This reduces the development material costs, installation and commissioning costs, and operation and maintenance costs of the energy storage and charging system. Furthermore, the energy storage and charging system has a small footprint, high deployment flexibility, and ensures operational efficiency and performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the energy dispatching method applied to the scenario where the energy storage and charging system discharges to the outside only through the charging pile in the embodiments of this application; Figure 2 This is a schematic diagram of the energy scheduling method in this application embodiment, which is applied to the scenario where the energy storage system only discharges to the outside through the charging pile, and considers charging the energy storage device. Figure 3 This is a schematic diagram of the energy scheduling method in this application embodiment, which is applied to the scenario where the energy storage system only discharges to the outside through the charging pile, and considers the minimum state of charge when the energy storage device is cut off from discharge. Figure 4This is a schematic diagram of the energy scheduling method in this application embodiment, which is applied to the scenario where the energy storage system only discharges to the outside through the charging pile, while simultaneously considering charging the energy storage device and the energy storage device's discharge cutoff to the minimum state of charge. Figure 5 This is a schematic diagram of the energy scheduling method in this application embodiment, where the power allocation priority of the energy storage and charging system is prioritized for charging piles, and the scenario of simultaneously considering peak shaving and external discharge of charging piles is taken into account. Figure 6 This is a schematic diagram of an energy scheduling method in this application embodiment, which is applied to a scenario that simultaneously considers peak shaving and external discharge of charging piles, where the power allocation priority of the energy storage and charging system is non-charging piles first, and when a charging pile requests charging and the power grid requests peak shaving from the energy storage and charging system. Figure 7 This is a schematic diagram of an energy scheduling method in this embodiment of the application, which is applied to a scenario that simultaneously considers peak shaving and external discharge of charging piles, where the power allocation priority of the energy storage and charging system is non-charging piles first, and the power grid requests peak shaving from the energy storage and charging system when the charging piles do not request charging. Detailed Implementation

[0017] To clearly illustrate the technical features of this solution, the implementation methods of this application will be described in detail below with reference to the accompanying drawings and embodiments. This will allow for a full understanding and implementation of how this application uses technical means to solve technical problems and achieve corresponding technical effects. The embodiments of this application and the various features within them can be combined with each other without conflict, and the resulting technical solutions are all within the protection scope of this application.

[0018] In this application: To request charging power, Preset charging power, The first upper limit power represents the maximum discharge power of the energy storage device. This is the second upper limit power, which represents the maximum power of the energy storage converter. For cell temperature, This refers to the upper limit temperature of energy storage devices. The first real-time power represents the real-time discharge power of the energy storage device to the charging pile. The second real-time power represents the real-time transmission power of the energy storage converter. It includes a first part of power, a second part of power, and a third part of power. The first part of power represents the transmission power from the grid to the charging pile, the second part of power represents the transmission power from the energy storage device to the grid, and the third part of power represents the transmission power from the grid to the energy storage device. The state of charge of the energy storage device. This represents the lowest state of charge before the energy storage device is discharged. The highest state of charge for charging energy storage devices. The real-time maximum discharge power of the energy storage device represents the real-time value of the maximum discharge power. At that time, the maximum discharge power of the energy storage device is a dynamic value that varies with the temperature of the battery cell; The power-temperature mapping relationship characterizes the mapping relationship between the maximum charge / discharge power of an energy storage device and the cell temperature. The maximum charge / discharge power is a value in the power-temperature mapping relationship. In the power-temperature mapping relationship, the temperature of each cell in the energy storage device corresponds to a maximum charge / discharge power. Characterization The maximum charge / discharge power corresponding to the cell temperature of the energy storage device at any given time in the power-temperature mapping relationship. Indicates time.

[0019] This application proposes an energy dispatch method for a charging and energy storage system, applicable to scenarios where the system discharges power only through charging piles. The system includes energy storage devices, charging piles, and an energy storage converter. The energy storage converter is connected to both the energy storage devices and the charging piles, and the energy storage devices are connected to the charging piles. When applied to scenarios where the system discharges power only through charging piles, the energy storage devices discharge power through the charging piles and / or transmit power to the charging piles through the energy storage converter, and / or the power grid transmits power to the energy storage devices through the energy storage converter.

[0020] The energy storage and charging system also includes an energy management system, which is connected to the energy storage equipment, charging piles and energy storage converters respectively. The energy management system is used to execute energy dispatching methods.

[0021] See Figure 1 The energy dispatching method includes: obtaining the requested charging power of the charging station. To obtain the mapping relationship between cell temperature and power temperature of energy storage devices; Determine the requested charging power separately and the first upper limit power Is it greater than the preset charging power? The first upper limit power characterizes the maximum discharge power of the energy storage device; When requesting charging power No more than the preset charging power When the device requesting charging does not accept or cannot accept the preset charging power. During charging, the energy storage device requests charging power through the charging station. Discharge is performed, assuming the requested charging power is... The cell temperature rises relatively slowly, and the cell temperature can be controlled by the liquid cooler in the battery storage system. The temperature remains below the upper limit of the energy storage device, so there is no need to consider supplementing power transmission through the energy storage converter.

[0022] When requesting charging power and the first upper limit power All are greater than the preset charging power At that time, it indicates that the device requesting charging can accept a preset charging power. The energy storage device can be pre-set to charge. Discharge to determine cell temperature Is it below the upper limit temperature of the energy storage device? ; When the cell temperature Temperature below the upper limit At that time At that time, the preset charging power will be used. As the first real-time power The first real-time power characterizes the real-time discharge power of the energy storage device to the charging pile; When the cell temperature Not less than the upper limit temperature At that time Time: The maximum charge / discharge power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the first real-time power. and preset charging power With the first real-time power The difference is used as the second real-time power. The second real-time power characterizes the real-time transmission power of the energy storage converter; the power-temperature mapping relationship characterizes the mapping relationship between the maximum charging and discharging power of the energy storage device and the cell temperature, with the maximum charging and discharging power being the value in the power-temperature mapping relationship. In the power-temperature mapping relationship, the temperature of each cell in the energy storage device corresponds to a maximum charge-discharge power. The system controls the energy storage device to discharge to the charging pile based on a first real-time power, and controls the energy storage converter to transmit power to the charging pile based on a second real-time power. At this time, the energy storage converter only transmits power to the charging pile from the grid, i.e., the first portion of the power is controlled as follows: And control the power of the second part and the power of the third part to be 0 respectively.

[0023] Requesting charging power and the first upper limit power All are greater than the preset charging power Under the condition of requesting charging: when At that time, control the first real-time power Preset charging power Control the energy storage device to preset the charging power through the charging pile. Discharge; when At that time, for safety and other considerations, it is necessary to reduce the maximum charging and discharging power of the energy storage device. Based on the power-temperature mapping relationship, the reduced maximum charging and discharging power is used as the first real-time power. That is, control Insufficient preset charging power Part of the power transmission is supplemented by energy storage converters, i.e., control. Controlling the energy storage device to provide the first real-time power through the charging pile The discharge controls the energy storage converter to operate at a second real-time power. Power is supplied to the charging pile; optionally, during the operation of the energy storage and charging system, in order to avoid the temperature of the battery cells and / or the energy storage converter rising too quickly, the energy storage and charging system uses a liquid cooler to exchange heat with the energy storage equipment and / or the energy storage converter. In actual use, the distribution of cooling power of the liquid cooler is dynamically adjusted according to the real-time temperature of the energy storage equipment and / or the energy storage converter.

[0024] By controlling the energy storage converter at the cell temperature Not less than the upper limit temperature The system continuously outputs power to the charging pile, enabling the requested device to maintain a preset charging power throughout the charging process by controlling the energy storage system. Charging can be achieved by using a low-power liquid chiller to continuously charge at a preset charging power, ensuring charging efficiency while avoiding the use of high-power liquid chillers. This reduces the development material costs, installation and commissioning costs, and operation and maintenance costs of the energy storage and charging system. In addition, the energy storage and charging system occupies little space, has high deployment flexibility, and ensures operating efficiency and performance.

[0025] Similarly, in actual use, when requesting charging power... No more than the preset charging power At that time, if the requested charging power During the discharge process from the energy storage device to the charging pile, if the cell temperature is not lower than the upper limit temperature... At that time, the maximum charge / discharge power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the first real-time power. Insufficient charging power requested Part of the power transmission is supplemented by the energy storage converter. At this time, the control... Controlling the energy storage device to provide the first real-time power through the charging pile The discharge controls the energy storage converter to operate at a second real-time power. By supplying power to the charging station, the device requesting charging can continuously request charging power through the energy storage system during the charging process. Charging. Similarly, at this time, the energy storage converter only supplies power from the grid to the charging pile, that is, it controls the first part of the power to be... And control the power of the second part and the power of the third part to be 0 respectively.

[0026] See Figure 2 In some embodiments, the energy dispatching method further includes: when a charging power is requested... Greater than the preset charging power and the first upper limit power No more than the preset charging power At that time, determine the first upper limit power. With the second upper limit power Is the sum greater than the preset charging power? The second upper limit power characterizes the maximum power of the energy storage converter; that is, at this point, the device requesting charging can accept a preset charging power. It can charge, but the energy storage device cannot preset the charging power. The discharge is insufficient to meet the preset charging power. Part of the power transmission is supplemented by controlling the energy storage converter; When the first upper limit power With the second upper limit power The sum of the values ​​should not exceed the preset charging power. At this time, it indicates that the energy storage and charging system cannot provide the preset charging power to the device requesting charging. When a device is discharging and requesting charging, it can choose to charge at low power or abandon charging.

[0027] When the first upper limit power With the second upper limit power The sum is greater than the preset charging power At this time, it indicates that the energy storage and charging system cannot provide the preset charging power to the device requesting charging. Discharge to determine cell temperature Is it below the upper limit temperature? ; When the cell temperature is lower than the upper limit temperature, the first upper limit power will be... As the first real-time power and preset charging power With the first upper limit power The difference is used as the second real-time power. By controlling the energy storage device to operate at a first upper limit power The system prioritizes allocating requested charging power, with any shortfall supplemented by energy storage converters to provide the preset charging power to the requesting devices. Discharge; When the cell temperature is not lower than the upper limit temperature, the maximum charging and discharging power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the first real-time power. and preset charging power With the first real-time power The difference is used as the second real-time power. .

[0028] exist Under the condition of requesting charging: when At that time, control the first real-time power The first upper limit power and control Controlling the energy storage device to provide the first real-time power through the charging pile Discharge, while controlling the energy storage converter to provide a second real-time power Power is supplied to the charging station; when At the same time, for safety and other considerations, it is necessary to reduce the maximum charging and discharging power of the energy storage device. Based on the power-temperature mapping relationship, the reduced maximum charging and discharging power is used as the first real-time power. Insufficient preset charging power Part of the power transmission is supplemented by energy storage converters, i.e., control. Controlling the energy storage device to provide the first real-time power through the charging pile The discharge controls the energy storage converter to operate at a second real-time power. Power is supplied to the charging pile. At this time, the energy storage converter only supplies power to the charging pile from the grid, that is, the first part of the power is controlled to be... And control the power of the second part and the power of the third part to be 0 respectively.

[0029] See Figure 2 In some embodiments, the energy dispatching method further includes: acquiring the state of charge of the energy storage device. ; All the above embodiments are based on the state of charge of the energy storage device. The operating condition that satisfies the requested total charging power, i.e., the state of charge of the energy storage device when the device requesting charging completes charging. All are not lower than the minimum state of charge at the discharge cutoff of the energy storage device. When the charging station terminates the charging request, At this time, the first real-time power is controlled to be 0, and the energy storage converter is controlled to supply power to the energy storage device at a preset power to achieve timely charging of the energy storage device. Optionally, to ensure charging efficiency, the energy storage converter is controlled to supply power at a second upper limit power. Power is supplied to the energy storage device. At this time, the energy storage converter only supplies power to the energy storage device from the grid, and the power of the third part is controlled to the second upper limit power. And control the power of the first part and the power of the second part to be 0 respectively. When hour, The charging of the energy storage device is cut off at the highest state of charge, and the energy storage converter is controlled to stop transmitting power to the energy storage device.

[0030] When the state of charge (SBC) of the energy storage device does not meet the total power required for charging, i.e., when the device requesting charging has not yet completed charging, the SBC... Below the minimum state of charge (POC) of the energy storage device When the first real-time power is set to 0, the energy storage device stops discharging and only outputs power to the charging pile through the energy storage converter. Determine the second upper limit power Is it greater than the preset charging power? That is, to determine whether the energy storage converter meets the preset charging power. Operating requirements for power transmission; See Figure 3 In requesting charging power Greater than the preset charging power Under operating conditions, when the second upper limit power Greater than the preset charging power At that time, the energy storage converter can meet the preset charging power. The operating conditions for power transmission. If charging of the energy storage device is not required, that is, when the energy storage converter only transmits power from the grid to the charging pile, the preset charging power will be... As the second real-time power That is, control Control the energy storage converter to preset charging power Supplying power to the charging station, i.e., controlling the first part of the power to the preset charging power. Furthermore, the power of the second and third parts are controlled to be 0. Additionally, while the energy storage converter is transmitting power from the grid to the charging pile, it is also transmitting power from the grid to the energy storage device. This means that while meeting the power demand of the charging pile, it is also sufficient to charge the energy storage device. Optionally, the power of the first part can be controlled to a preset charging power. Control the power of the second part to 0, and control the power of the third part to That is, controlling the energy storage converter to preset charging power. Power is supplied to the charging station, and with Power is supplied to energy storage devices.

[0031] Requesting charging power No more than the preset charging power Under certain operating conditions, it is necessary to further determine the second upper limit power. Is it greater than the requested charging power? That is, to determine whether the energy storage converter meets the requirements for requesting charging power. Operating requirements for power transmission.

[0032] When the second upper limit power No more than the preset charging power At that time, the energy storage converter cannot meet the preset charging power. The operating conditions for power transmission will require a second upper limit on power. As the second real-time power Devices requesting charging can choose low-power charging, i.e., no more than the second upper limit power. When performing operations such as charging or abandoning charging, the device requesting charging will select low-power charging, i.e., no more than the second upper limit power. Optionally, during charging, the energy storage converter is used only to meet the power demand of the charging pile, controlling the first part of the power to the second upper limit power. And control the power of the second part and the power of the third part to be 0 respectively.

[0033] When the second upper limit power Greater than the requested charging power At that time, the energy storage converter can meet the requested charging power. When power transmission is required, if charging of the energy storage device is not needed, that is, when the energy storage converter only transmits power from the grid to the charging station, it will request charging power. As the second real-time power That is, control Control the energy storage converter to request charging power Supplying power to the charging station, i.e., controlling the first part of the power to the requested charging power. Furthermore, the second and third power components are controlled to be 0. Additionally, while the energy storage converter is transmitting power from the grid to the charging pile, it is also transmitting power from the grid to the energy storage device. This means that while meeting the power demand of the charging pile, it is also sufficient to charge the energy storage device. Optionally, the first power component is controlled to be the requested charging power. Control the power of the second part to 0, and control the power of the third part to That is, controlling the energy storage converter to request charging power. Power is supplied to the charging station, and with Power is supplied to energy storage devices.

[0034] See Figure 4 During the process of the energy storage converter transmitting power to the charging pile, if it is necessary to charge the energy storage device at the same time, when the second upper limit power... Greater than the requested charging power At that time, the second upper limit power Greater than the requested charging power A portion of it is used to charge energy storage devices, that is, to control the energy storage converter to request charging power. Power is supplied to the charging piles, while the energy storage converter is controlled to... Power is supplied to the energy storage device to charge it.

[0035] During the process of the energy storage converter simultaneously supplying power to the charging pile and the energy storage device, when the charging pile terminates the charging request... At this time, the energy storage converter is controlled to supply power only to the energy storage device; optionally, the energy storage converter is controlled to operate at a second upper limit power. When power is supplied to the energy storage device, the energy storage converter only supplies power from the grid to the energy storage device, controlling the first and second parts of power to be 0, and controlling the third part of power to be the second upper limit power. until At that time, the energy storage converter stops transmitting power from the grid to the energy storage device.

[0036] See Figure 5 The energy dispatching method of the energy storage and charging system is also applied to scenarios that simultaneously consider peak shaving and external discharge of charging piles. In this case, the energy storage device discharges to the outside through the charging pile, and / or the power grid transmits power to the charging pile through the energy storage converter, and / or the power grid transmits power to the energy storage device through the energy storage converter, and / or the power grid transmits power to the grid through the energy storage converter.

[0037] In some embodiments, the energy scheduling method further includes: determining whether the power allocation priority of the energy storage and charging system is priority for charging piles; When the power allocation priority is charging pile priority, that is, the energy storage and charging system prioritizes allocating energy storage devices to discharge through charging piles, it is necessary to determine whether the charging pile requests charging and whether the power grid requests peak shaving from the energy storage and charging system. When a charging pile requests charging and the power grid does not request peak shaving from the energy storage and charging system, the energy dispatching method is the same as the energy dispatching method applied to scenarios where the energy storage and charging system only discharges to the outside through the charging pile.

[0038] When a charging pile requests charging and the power grid requests peak shaving from the energy storage and charging system; Determine the requested charging power separately and the first upper limit power Is it greater than the preset charging power? ; When requesting charging power and the first upper limit power All are greater than the preset charging power At that time, because the power allocation priority of the energy storage and charging system is to prioritize charging piles, the second real-time power is controlled to be 0, and the cell temperature is judged. Is it below the upper limit temperature? That is, at this time, the power transmitted from the energy storage converter to the grid is 0. When the cell temperature Temperature below the upper limit At that time, the preset charging power will be used. As the first real-time power That is, control at this time Control the energy storage device to operate at the first real-time power. Preset charging power Discharge to the charging station; When the cell temperature Not less than the upper limit temperature Time: The maximum charge / discharge power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the first real-time power. Similarly, for safety and other considerations, it is necessary to reduce the maximum charging and discharging power of energy storage devices. Based on the power-temperature mapping relationship, the reduced maximum charging and discharging power is used as the first real-time power. Control the energy storage device to operate at the first real-time power. Discharge to the charging station.

[0039] In some embodiments, the energy dispatching method further includes: when a charging power is requested... No more than the preset charging power and the first upper limit power Greater than the preset charging power At that time, determine the cell temperature Is it below the upper limit temperature? ; When the cell temperature Temperature below the upper limit At that time, a charging power request will be made. As the first real-time power and preset charging power With requested charging power The difference is used as the second real-time power. The device requesting charging can only accept power no higher than the requested charging power. During charging, at this time, control Preset charging power The remaining portion is used for peak reduction, i.e., control. Control the energy storage device to operate at the first real-time power. That is, request charging power Discharge to the charging pile, control the energy storage converter to output a second real-time power. When transmitting power to the grid, the energy storage converter only transmits power to the grid from the energy storage device. The power of the first and third parts is controlled to be 0, and the power of the second part is controlled to be... ; When the cell temperature is not lower than the upper limit temperature: the maximum charging and discharging power corresponding to the cell temperature in the power-temperature mapping relationship is used as the first real-time power. And obtaining the second real-time power based on the power reduction strategy. Since the power allocation priority of the energy storage and charging system is based on charging piles, in order to prioritize the charging needs of the charging piles, the energy storage converter needs to reduce its output power to reduce the cooling power of the liquid cooler on the energy storage converter, so that more cooling power can be used to reduce the temperature of the battery cells.

[0040] Optionally, the power reduction strategy includes controlling the transmission power of the energy storage converter to be reduced at a preset rate, i.e., controlling the second real-time power. Gradually decrease at the preset rate until The second real-time power is from Gradually reduce to the preset rate In this process, the energy storage converter only transmits power to the grid from the energy storage device, that is, it controls the power of the first part and the third part to be 0, and controls the power of the second part to be... The temperature is gradually reduced to 0 at a preset rate. At this point, all the cooling power of the liquid chiller is used to reduce the temperature of the battery cell. When the cell temperature Temperature below the upper limit again At that time, a charging power request will be made. As the first real-time power That is, at this time, control Control the energy storage device to operate at the first real-time power. That is, request charging power Discharge to the charging station; When the cell temperature Not less than the upper limit temperature Time: The maximum charge / discharge power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the first real-time power. Control the energy storage device to operate at the first real-time power. Discharge to the charging station.

[0041] In some embodiments, the energy dispatching method further includes: when the charging pile does not request charging and the power grid requests peak shaving from the energy storage system, controlling the power of the energy storage device discharging to the charging pile to be 0, i.e., controlling the first real-time power to be 0, and determining the second upper limit power. Is it greater than the requested charging power? Second upper limit power Characterizes the maximum power of the energy storage converter; When the second upper limit power Greater than the requested charging power At that time, a charging power request will be made. As the second real-time power That is, at this time, control Control the energy storage converter to provide a second real-time power. That is, request charging power Power is transmitted to the grid; at this time, the energy storage converter only transmits power to the grid from the energy storage device, that is, the power of the first part and the power of the third part are controlled to be 0, and the power of the second part is controlled to be the requested charging power. .

[0042] When the second upper limit power Not greater than the requested charging power At that time, the second upper limit power will be... As the second real-time power That is, at this time, control Control the energy storage converter to provide a second real-time power. That is, the second upper limit power. Power is transmitted to the grid. Similarly, at this time, the energy storage converter only transmits power to the grid from the energy storage device, that is, the power of the first part and the power of the third part are controlled to be 0, and the power of the second part is controlled to the second upper limit power. .

[0043] See Figure 6 In some embodiments, the energy dispatching method further includes: when the power allocation priority is non-charging pile priority, the energy storage and charging system allocates power to the charging piles without priority; that is, in this embodiment, the energy storage and charging system prioritizes power transmission to the grid through the energy storage converter. It also determines whether the charging pile requests charging and whether the grid requests peak shaving from the energy storage and charging system. When a charging pile requests charging and the power grid does not request peak shaving from the energy storage and charging system, the energy dispatching method is the same as the energy dispatching method applied to scenarios where the energy storage and charging system only discharges to the outside through the charging pile.

[0044] When a charging pile requests charging and the power grid requests peak shaving from the energy storage and charging system, it is determined whether the cell temperature is lower than the upper limit temperature. When the cell temperature Temperature below the upper limit At that time, the first upper limit power will be... With the second upper limit power The difference is used as the first real-time power. and the second upper limit power As the second real-time power Because the energy storage and charging system prioritizes power transmission to the grid through the energy storage converter, when it receives a peak-shaving request from the grid, the system prioritizes meeting the peak-shaving demand and controls the energy storage converter to transmit power to the grid at full power, i.e., controls... The remaining power of the energy storage device is used to discharge to the charging pile, i.e., control. At this time, control the energy storage device to Discharging to the charging pile and controlling the energy storage converter to... Power is transmitted from the energy storage device to the grid; at this time, the power of the first part and the power of the third part are controlled to be 0, and the power of the second part is controlled to the second upper limit power. .

[0045] When the cell temperature Not less than the upper limit temperature At time: The maximum charge / discharge power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the real-time maximum discharge power of the energy storage device. Real-time maximum discharge power characterizes the real-time value of the maximum discharge power, that is, in At that time, the maximum discharge power of the energy storage device is a dynamic value that changes with the cell temperature; determining the real-time maximum discharge power... Is it greater than the second upper limit power? ; When the real-time maximum discharge power Power greater than the second upper limit At that time, the maximum discharge power will be displayed in real time. With the second upper limit power The difference is used as the first real-time power. and the second upper limit power As the second real-time power This means that the real-time maximum discharge power of the energy storage device is sufficient to maintain the energy storage converter transmitting power to the grid at full power, i.e., control. The remaining power is used to discharge to the charging station, i.e., control. At this time, control the energy storage device to Discharging to the charging pile and controlling the energy storage converter to... Power is transmitted from the energy storage device to the grid. At this point, the power of the first and third parts is controlled to be 0, and the power of the second part is controlled to the second upper limit power. .

[0046] When the real-time maximum discharge power Not greater than the second upper limit power At that time, the real-time maximum discharge power of the energy storage device can only fully supply the peak shaving demand. Controlling the energy storage device to stop discharging to the charging pile is equivalent to controlling the first real-time power. The value is 0, and the real-time maximum discharge power is set to 0. As the second real-time power That is, control Control the energy storage converter to Power is transmitted from the energy storage device to the grid. At this point, the power of the first and third parts is controlled to be 0, while the power of the second part is controlled to be the real-time maximum discharge power. .

[0047] See Figure 7In some embodiments, when the charging pile does not request charging and the power grid requests peak shaving from the energy storage system, the first real-time power is controlled to be 0, that is, the power of the energy storage device discharging to the charging pile is 0, and it is determined whether the cell temperature is lower than the upper limit temperature. When the cell temperature Temperature below the upper limit At that time, the second upper limit power will be... As the second real-time power That is, controlling the energy storage converter to full power. The energy storage device transmits power to the grid by controlling the power of the first and third parts to be 0, and controlling the power of the second part to be the second upper limit power. .

[0048] When the cell temperature Not less than the upper limit temperature At that time, the real-time maximum discharge power of the energy storage device is obtained based on the power-temperature mapping relationship. Determine the real-time maximum discharge power Is it greater than the second upper limit power? When the real-time maximum discharge power Power greater than the second upper limit At that time, the second upper limit power will be... As the second real-time power This means that the real-time maximum discharge power of the energy storage device is sufficient to maintain the energy storage converter transmitting power to the grid at full power, i.e., control. At this time, and controlling the energy storage converter to Power is transmitted from the energy storage device to the grid, meaning that the power of the first and third parts is still controlled to be 0, and the power of the second part is controlled to the second upper limit power. .

[0049] When the real-time maximum discharge power Not greater than the second upper limit power At that time, the real-time maximum discharge power of the energy storage device is entirely supplied to peak shaving demand, and the real-time maximum discharge power is... As the second real-time power That is, control Control the energy storage converter to When power is transmitted from the energy storage device to the grid, the power of the first and third parts is controlled to be 0, and the power of the second part is controlled to be the real-time maximum discharge power. .

[0050] When energy dispatching methods are applied to scenarios that simultaneously consider peak shaving and the external discharge of charging piles, when When the charging pile does not request charging and the power grid does not request peak shaving from the energy storage device, the energy storage device will terminate its discharge. At that time, the energy storage converter is controlled to transmit power from the grid to the energy storage device. Optionally, the energy storage converter is controlled to operate at a second upper limit power. Power is transmitted from the power grid to the energy storage device, meaning the first and second parts of the power are controlled to be 0, and the third part of the power is controlled to be the second upper limit power. until At that time, the control energy storage converter stops transmitting power to the energy storage device.

[0051] Those skilled in the art will understand that embodiments of this application can be provided as methods, apparatus (systems), or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0052] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce an instruction that executes via the processor of the computer or other programmable data processing apparatus to create an instruction for implementing the flowchart. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0053] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0054] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0055] Finally, it should be noted that the above content is only used to illustrate the technical solution of this application, and is not intended to limit the scope of protection of this application. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this application shall not depart from the substance and scope of the technical solution of this application.

Claims

1. An energy dispatching method for a storage and charging system, the storage and charging system comprising energy storage devices, charging piles, and energy storage converters, characterized in that, The energy scheduling method includes: It is determined whether the requested charging power and the first upper limit power of the charging pile are greater than the preset charging power, wherein the first upper limit power represents the maximum discharge power of the energy storage device; When both the requested charging power and the first upper limit power are greater than the preset charging power, it is determined whether the cell temperature of the energy storage device is not less than the upper limit temperature of the energy storage device. When the cell temperature is not lower than the upper limit temperature, the maximum charging and discharging power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the first real-time power, and the difference between the preset charging power and the first real-time power is taken as the second real-time power. The power-temperature mapping relationship represents the mapping relationship between the maximum charging and discharging power of the energy storage device and the cell temperature. The first real-time power represents the real-time discharge power of the energy storage device to the charging pile, and the second real-time power represents the real-time transmission power of the energy storage converter. The system controls the energy storage device to discharge to the charging pile based on the first real-time power, and controls the energy storage converter to transmit power to the charging pile based on the second real-time power.

2. The energy scheduling method for the energy storage and charging system according to claim 1, characterized in that, The energy dispatching method further includes: when the requested charging power is greater than the preset charging power and the first upper limit power is not greater than the preset charging power, determining whether the sum of the first upper limit power and the second upper limit power is greater than the preset charging power, wherein the second upper limit power represents the maximum power of the energy storage converter; When the sum of the first upper limit power and the second upper limit power is greater than the preset charging power, it is determined whether the cell temperature is less than the upper limit temperature; When the cell temperature is lower than the upper limit temperature, the first upper limit power is used as the first real-time power, and the difference between the preset charging power and the first upper limit power is used as the second real-time power; When the cell temperature is not lower than the upper limit temperature, the maximum charge and discharge power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the first real-time power, and the difference between the preset charging power and the first real-time power is taken as the second real-time power.

3. The energy scheduling method for the energy storage and charging system according to claim 2, characterized in that, The energy dispatching method further includes: acquiring the state of charge of the energy storage device; When the state of charge is lower than the minimum state of charge at which the energy storage device is cut off from discharge, the first real-time power is controlled to be 0. Determine whether the second upper limit power is greater than the preset charging power; When the second upper limit power is greater than the preset charging power, the preset charging power is used as the second real-time power.

4. The energy scheduling method for the energy storage and charging system according to claim 3, characterized in that, The energy scheduling method further includes: when the second upper limit power is not greater than the preset charging power, the second upper limit power is used as the second real-time power.

5. The energy scheduling method for the energy storage and charging system according to claim 1, characterized in that, The energy scheduling method further includes: determining whether the power allocation priority of the energy storage and charging system is priority for charging piles; When the power allocation priority is charging pile priority, it is determined whether the charging pile requests charging and whether the power grid requests peak shaving from the energy storage and charging system. When the charging pile requests charging and the power grid requests peak shaving from the energy storage and charging system; Determine whether the requested charging power and the first upper limit power are greater than the preset charging power; When both the requested charging power and the first upper limit power are greater than the preset charging power, the second real-time power is controlled to be 0, and it is determined whether the cell temperature is less than the upper limit temperature; When the cell temperature is lower than the upper limit temperature, the preset charging power is used as the first real-time power; When the cell temperature is not lower than the upper limit temperature, the maximum charge and discharge power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the first real-time power. The energy storage device is controlled to discharge to the charging pile based on the first real-time power, and the energy storage converter is controlled to transmit power to the power grid based on the second real-time power.

6. The energy scheduling method for the energy storage and charging system according to claim 5, characterized in that, The energy scheduling method further includes: when the requested charging power is not greater than the preset charging power and the first upper limit power is greater than the preset charging power, determining whether the cell temperature is less than the upper limit temperature; When the cell temperature is lower than the upper limit temperature, the requested charging power is used as the first real-time power, and the difference between the preset charging power and the requested charging power is used as the second real-time power. When the cell temperature is not lower than the upper limit temperature, the maximum charge and discharge power corresponding to the cell temperature in the power-temperature mapping relationship is used as the first real-time power, and the second real-time power is obtained based on the power reduction strategy. The second real-time power characterization obtained based on the power reduction strategy is controlled to reduce the second real-time power at a preset rate until the second real-time power is 0.

7. The energy scheduling method for the energy storage and charging system according to claim 5, characterized in that, The energy dispatching method further includes: when the charging pile does not request charging and the power grid requests peak shaving from the energy storage and charging system, controlling the first real-time power to be 0, and determining whether the second upper limit power is greater than the requested charging power, wherein the second upper limit power represents the maximum power of the energy storage converter; When the second upper limit power is greater than the requested charging power, the requested charging power is taken as the second real-time power; When the second upper limit power is not greater than the requested charging power, the second upper limit power is taken as the second real-time power.

8. The energy scheduling method for the energy storage and charging system according to claim 5, characterized in that, The energy dispatching method further includes: when the power allocation priority is non-charging pile priority, determining whether the charging pile requests charging and whether the power grid requests peak shaving from the energy storage and charging system, respectively; When the charging pile requests charging and the power grid requests peak shaving from the energy storage and charging system, it is determined whether the cell temperature is lower than the upper limit temperature. When the cell temperature is lower than the upper limit temperature, the difference between the first upper limit power and the second upper limit power is taken as the first real-time power, and the second upper limit power is taken as the second real-time power. The second upper limit power represents the maximum power of the energy storage converter. When the cell temperature is not lower than the upper limit temperature, the maximum charge and discharge power corresponding to the cell temperature in the power-temperature mapping relationship is taken as the real-time maximum discharge power of the energy storage device. Determine whether the real-time maximum discharge power is greater than the second upper limit power; When the real-time maximum discharge power is greater than the second upper limit power, the difference between the real-time maximum discharge power and the second upper limit power is taken as the first real-time power, and the second upper limit power is taken as the second real-time power.

9. The energy scheduling method for the energy storage and charging system according to claim 8, characterized in that, The energy scheduling method further includes: when the real-time maximum discharge power is not greater than the second upper limit power, controlling the first real-time power to be 0, and using the real-time maximum discharge power as the second real-time power.

10. The energy scheduling method for the energy storage and charging system according to claim 8, characterized in that, When the charging pile does not request charging and the power grid requests peak shaving from the energy storage and charging system, the first real-time power is controlled to be 0, and it is determined whether the cell temperature is lower than the upper limit temperature. When the cell temperature is lower than the upper limit temperature, the second upper limit power is used as the second real-time power.

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