Energy scheduling method and apparatus, control device, and storage medium

Abstract

The application provides an energy scheduling method and device, a control device and a storage medium, and relates to the technical field of photovoltaic technology.The method comprises the following steps: in the case that a charging pile is started, the current operating power of the charging pile is acquired, a first power difference between the upper limit of the operating power of the charging pile and the current operating power is acquired, in the case that the output power of a power grid point of common coupling is less than or equal to the first power difference, if the energy storage battery is in a charging or standby state, the output power and / or the charging power of the energy storage battery is reduced, and the current operating power is increased.In the case that the PCC is in an output state, the current operating power of the charging pile is increased, and the charging power of the energy storage battery is reduced, so that the number of charging and discharging of the energy storage battery can be reduced, the service life of the energy storage battery is prolonged, and therefore, the operation cost of the photovoltaic energy storage charging system can be reduced.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and in particular to an energy dispatching method, apparatus, control device, and storage medium. Background Technology

[0002] A photovoltaic (PV) energy storage charging system typically includes control equipment, PV modules, energy storage batteries, and a load. The control equipment is connected to the energy storage batteries, PV modules, and load, and is also connected to the point of common coupling (PCC) of the power grid. The control equipment can schedule power distribution among the energy storage batteries, the grid, and the load based on the PV module's power output, the load's power output, and the energy storage battery's charging and discharging power, thus maintaining power balance within the energy storage system.

[0003] With the development of new energy technologies, more and more charging piles are being connected to photovoltaic energy storage charging systems. Since the starting and stopping of charging piles is random, the connection of charging piles will increase the operating cost of photovoltaic energy storage charging systems. Summary of the Invention

[0004] This invention provides an energy dispatching method, apparatus, control device, and storage medium, aiming to solve the problem of increased operating costs after a photovoltaic energy storage charging system is connected to a charging pile.

[0005] The first aspect of this invention provides an energy dispatching method applied to a control device in a photovoltaic energy storage charging system. The photovoltaic energy storage charging system further includes a charging pile and an energy storage battery. The control device is connected to the charging pile, the energy storage battery, and a point of common coupling (PCC) of the power grid. The method includes:

[0006] When the charging pile is started, obtain the current operating power of the charging pile;

[0007] Obtain the first power difference between the upper limit of the operating power of the charging pile and the current operating power;

[0008] If the output power at the point of common coupling of the power grid does not exceed the first power difference, and the energy storage battery is in a charging or standby state, then the output power and / or the charging power of the energy storage battery are reduced, and the current operating power is increased.

[0009] Wherein, the increased current operating power is less than or equal to the operating power upper limit.

[0010] Optionally, the method further includes:

[0011] If the energy storage battery is in a discharging state and the output power does not exceed the first power difference, the output power will be reduced to 0 and the current operating power will be increased by increasing the output power.

[0012] If the output power is greater than the first power difference, the output power is reduced and the current operating power is increased;

[0013] Wherein, the increased current operating power is less than or equal to the operating power upper limit.

[0014] Optionally, reducing the output power and / or the charging power of the energy storage battery, and increasing the current operating power, includes:

[0015] Obtain the first power sum of the charging power and the output power;

[0016] If the sum of the first power is greater than the first power difference, the output power is adjusted to 0, the charging power is reduced, and the current operating power is increased to the upper limit of the operating power.

[0017] If the sum of the first power is less than or equal to the first power difference, the output power and the charging power are reduced to 0, and the current operating power is increased by the sum of the first power.

[0018] Optionally, the method further includes:

[0019] Obtain the second power difference between the lower limit of the operating power of the charging pile and the current operating power;

[0020] If the input power at the point of common coupling is greater than the second power difference, the current operating power and the input power will be reduced by the same amount.

[0021] Wherein, the reduced current operating power is not lower than the lower limit of operating power.

[0022] Optionally, the method further includes:

[0023] If the input power is less than or equal to the second power difference, and the energy storage battery is in a charging state, the input power is adjusted to 0, and the current operating power is reduced by the input power.

[0024] If the input power is less than or equal to the second power difference, and the energy storage battery is in a discharging or standby state, then the input power and / or the discharge power of the energy storage battery are reduced, and the current operating power is reduced.

[0025] Wherein, the reduced current operating power is not lower than the lower limit of operating power.

[0026] Optionally, reducing the input power and / or the discharge power of the energy storage battery, and reducing the current operating power, includes:

[0027] Obtain the second power sum of the input power and the discharge power;

[0028] If the sum of the second power is greater than the difference of the second power, the input power is reduced to 0, the discharge power is reduced, and the current operating power is reduced to the lower limit of the operating power.

[0029] If the second power sum is less than or equal to the second power difference, both the input power and the discharge power are reduced to 0, and the current operating power is reduced by the second power sum.

[0030] Optionally, the method further includes:

[0031] When the power at the point of common coupling is 0, if the energy storage battery is in a discharging or standby state, the current operating power and the discharge power of the energy storage battery will be reduced by the same amount; wherein the reduced current operating power is not lower than the lower limit of the operating power of the charging pile.

[0032] If the energy storage battery is charging when the power at the point of common coupling is 0, the charging power of the energy storage battery is reduced and the current operating power is increased.

[0033] Wherein, the increased current operating power is not higher than the operating power upper limit.

[0034] A second aspect of this invention provides another energy dispatching method applied to a control device in a photovoltaic energy storage charging system. The photovoltaic energy storage charging system further includes a charging pile, an energy storage battery, and a switchable load. The control device is connected to the charging pile, the energy storage battery, and the switchable load, respectively. The method further includes:

[0035] When the charging pile is started, the shut-off load is turned off, and the current operating power of the charging pile and the load power of the shut-off load are obtained.

[0036] Obtain the third power difference between the load power and the current operating power;

[0037] The current operating power is kept constant, and the charging and discharging power of the energy storage battery is adjusted based on the third power difference to maintain the power balance of the photovoltaic energy storage charging system.

[0038] Optionally, adjusting the charging and discharging power of the energy storage battery based on the third power difference includes:

[0039] If the current operating power is less than or equal to the load power, and the energy storage battery is in a discharging state, then the discharge power of the energy storage battery is reduced by the third power difference.

[0040] If the current operating power is less than or equal to the load power, and the energy storage battery is in standby mode, then the energy storage battery is controlled to charge at a charging power not exceeding the third power difference.

[0041] If the current operating power is less than or equal to the load power, and the energy storage battery is in a charging state, then the charging power of the energy storage battery is increased by the third power difference.

[0042] Optionally, adjusting the charging and discharging power of the energy storage battery based on the third power difference includes:

[0043] If the current operating power is greater than the load power, and the energy storage battery is in a discharging or standby state, the discharge redundancy power of the energy storage battery is obtained.

[0044] If the discharge redundant power is greater than or equal to the third power difference, the discharge power of the energy storage battery is increased by the third power difference.

[0045] If the discharge redundancy power is less than the third power difference, the energy storage battery is controlled to discharge at the maximum discharge power, and the input power of the grid common connection point is controlled to increase by a first power value; the first power value is the difference between the discharge redundancy power and the third power difference.

[0046] Optionally, adjusting the charging and discharging power of the energy storage battery based on the third power difference includes:

[0047] If the energy storage battery is in a charging state when the current operating power is greater than the load power, then the maximum power reduction of the charging power of the energy storage battery is determined.

[0048] If the maximum power reduction is greater than or equal to the third power difference, the charging power is reduced by the third power difference.

[0049] If the maximum power drop is less than the third power difference, and the energy storage battery is determined to be dischargeable based on its state of charge value, then the energy storage battery is switched to a discharge state, and a fourth power difference between the maximum power drop and the third power difference is obtained.

[0050] When the maximum discharge power of the energy storage battery is greater than or equal to the fourth power difference, the energy storage battery is controlled to discharge at the fourth power difference.

[0051] If the maximum discharge power is less than the fourth power difference, the energy storage battery is controlled to discharge at the maximum discharge power, and the input power of the grid common coupling point is controlled to increase by a second power value; the second power value is the difference between the fourth power difference and the maximum discharge power.

[0052] A third aspect of this invention provides yet another energy dispatching method, applied to a control device in a photovoltaic energy storage charging system. The method includes:

[0053] Upon receiving the first input, in response to the first input, the method described in the first aspect is executed;

[0054] Upon receiving a second input, in response to the second input, the method described in the second aspect is executed.

[0055] A fourth aspect of this invention provides an energy dispatching control device installed in a photovoltaic energy storage charging system. The photovoltaic energy storage charging system further includes a charging pile and an energy storage battery. The control device is connected to both the charging pile and the energy storage battery, and is also connected to a point of common coupling (PCC) of the power grid. The device includes:

[0056] The first acquisition module is used to acquire the current operating power of the charging pile when the charging pile is started.

[0057] The second acquisition module is used to acquire a first power difference between the upper limit of the operating power of the charging pile and the current operating power;

[0058] The control module is configured to, when the output power at the power grid common coupling point is less than or equal to the first power difference, reduce the output power and / or the charging power of the energy storage battery, and increase the current operating power if the energy storage battery is in a charging or standby state.

[0059] Wherein, the increased current operating power is less than or equal to the operating power upper limit.

[0060] Optionally, the control module is further configured to, if the energy storage battery is in a discharging state and the output power is reduced to 0, and the current operating power is increased by increasing the output power when the output power does not exceed the first power difference; and to, if the output power is greater than the first power difference, to, reduce the output power and increase the current operating power.

[0061] Wherein, the increased current operating power is less than or equal to the operating power upper limit.

[0062] Optionally, the control module is specifically configured to obtain a first power sum of the charging power and the output power; if the first power sum is greater than the first power difference, adjust the output power to 0, reduce the charging power, and increase the current operating power to the upper limit of the operating power; if the first power sum is less than or equal to the first power difference, reduce the output power and the charging power to 0, and increase the current operating power to the first power sum.

[0063] Optionally, the control module is further configured to obtain a second power difference between the lower limit of the operating power of the charging pile and the current operating power; if the input power at the power grid common coupling point is greater than the second power difference, reduce the current operating power and the input power by the same amount; wherein the reduced current operating power is not lower than the lower limit of the operating power.

[0064] Optionally, the control module is further configured to, when the input power is less than or equal to the second power difference, adjust the input power to 0 and reduce the current operating power by the input power if the energy storage battery is in a charging state. When the input power is less than or equal to the second power difference, if the energy storage battery is in a discharging or standby state, reduce the input power and / or the discharge power of the energy storage battery, and reduce the current operating power; wherein the reduced current operating power is not lower than the lower limit of the operating power.

[0065] Optionally, the control module is specifically configured to obtain a second power sum of the input power and the discharge power; if the second power sum is greater than the second power difference, reduce the input power to 0, reduce the discharge power, and reduce the current operating power to the lower limit of the operating power; if the second power sum is less than or equal to the second power difference, reduce both the input power and the discharge power to 0, and reduce the current operating power to the second power sum.

[0066] Optionally, the control module is specifically configured to, when the power at the point of common coupling to the power grid is 0, if the energy storage battery is in a discharging or standby state, reduce the current operating power and the discharging power of the energy storage battery by the same amount; wherein the reduced current operating power is not lower than the lower limit of the operating power of the charging pile; and when the power at the point of common coupling to the power grid is 0, if the energy storage battery is in a charging state, reduce the charging power of the energy storage battery and increase the current operating power; wherein the increased current operating power is not higher than the upper limit of the operating power.

[0067] A fifth aspect of this invention provides another energy dispatching method, comprising a control device installed in a photovoltaic energy storage charging system, wherein the photovoltaic energy storage charging system further includes a charging pile, an energy storage battery, and a switchable load, and the control device is connected to the charging pile, the energy storage battery, and the switchable load respectively; the device includes:

[0068] The first acquisition module is used to shut down the switchable load when the charging pile is started, and to acquire the current operating power of the charging pile and the load power of the switchable load.

[0069] The second acquisition module is used to acquire a third power difference between the load power and the current operating power;

[0070] The control module is used to maintain the current operating power unchanged and adjust the charging and discharging power of the energy storage battery based on the third power difference in order to maintain the power balance of the photovoltaic energy storage charging system.

[0071] Optionally, the control module is specifically configured to: when the current operating power is less than or equal to the load power, if the energy storage battery is in a discharging state, reduce the discharge power of the energy storage battery by the third power difference; when the current operating power is less than or equal to the load power, if the energy storage battery is in a standby state, control the energy storage battery to charge at a charging power not higher than the third power difference; and when the current operating power is less than or equal to the load power, if the energy storage battery is in a charging state, increase the charging power of the energy storage battery by the third power difference.

[0072] Optionally, the control device is connected to the power grid common coupling point; the control module is specifically configured to, when the current operating power is greater than the load power, if the energy storage battery is in a discharging or standby state, obtain the discharge redundancy power of the energy storage battery; when the discharge redundancy power is greater than or equal to the third power difference, increase the discharge power of the energy storage battery by the third power difference; when the discharge redundancy power is less than the third power difference, control the energy storage battery to discharge at the maximum discharge power, and control the input power of the power grid common coupling point to increase by a first power value; the first power value is the difference between the discharge redundancy power and the third power difference.

[0073] Optionally, the control device is connected to the grid's point of common coupling (PCC). Specifically, the control module is configured to: when the current operating power is greater than the load power, if the energy storage battery is in a charging state, determine the maximum power reduction of the charging power of the energy storage battery; when the maximum power reduction is greater than or equal to the third power difference, reduce the charging power by the third power difference; when the maximum power reduction is less than the third power difference, if the energy storage battery is determined to be dischargeable based on its state of charge (SOC), switch the energy storage battery to a discharging state and obtain a fourth power difference between the maximum power reduction and the third power difference; when the maximum discharge power of the energy storage battery is greater than or equal to the fourth power difference, control the energy storage battery to discharge at the fourth power difference; when the maximum discharge power is less than the fourth power difference, control the energy storage battery to discharge at the maximum discharge power and control the input power of the PCC to increase by a second power value; the second power value is the difference between the fourth power difference and the maximum discharge power.

[0074] A sixth aspect of the present invention provides a control device, the control device including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein when the program or instructions are executed by the processor, the steps of the energy scheduling method as described in the first, second, or third aspect are implemented.

[0075] A seventh aspect of the present invention provides a readable storage medium storing a program or instructions that, when executed by a processor, implement the steps of the energy scheduling method as described in the first, second, or third aspect.

[0076] In this embodiment of the invention, when the charging pile is activated, the current operating power of the charging pile is obtained, and a first power difference between the upper limit of the charging pile's operating power and the current operating power is obtained. If the output power of the point of common coupling (PCC) is less than or equal to the first power difference, and if the energy storage battery is in a charging or standby state, the output power and / or the charging power of the energy storage battery are reduced, and the current operating power is increased. When the PCC is in the output state, increasing the current operating power of the charging pile and reducing the charging power of the energy storage battery can reduce the number of charge-discharge cycles of the energy storage battery, extend the service life of the energy storage battery, and thus reduce the operating cost of the photovoltaic energy storage charging system. Attached Figure Description

[0077] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0078] Figure 1 A flowchart illustrating the steps of an energy scheduling method according to an embodiment of the present invention is shown;

[0079] Figure 2 A schematic diagram of a photovoltaic energy storage charging system according to an embodiment of the present invention is shown;

[0080] Figure 3 A flowchart illustrating an energy scheduling method according to an embodiment of the present invention is shown;

[0081] Figure 4 A flowchart illustrating the steps of another energy scheduling method in an embodiment of the present invention is shown;

[0082] Figure 5 A flowchart illustrating a control method for an energy storage battery according to an embodiment of the present invention is shown;

[0083] Figure 6 A flowchart illustrating another control method for an energy storage battery according to an embodiment of the present invention is shown;

[0084] Figure 7 A flowchart illustrating another control method for an energy storage battery according to an embodiment of the present invention is shown;

[0085] Figure 8 A flowchart illustrating the steps of another energy scheduling method in an embodiment of the present invention is shown;

[0086] Figure 9 A schematic diagram of the structure of an energy dispatching device according to an embodiment of the present invention is shown;

[0087] Figure 10 A schematic diagram of an energy dispatching device according to an embodiment of the present invention is shown. Detailed Implementation

[0088] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0089] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0090] The energy scheduling method provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0091] Reference Figure 1 This diagram illustrates a flowchart of an energy dispatching method according to an embodiment of the present invention. The method is applied to a control device in a photovoltaic energy storage charging system. The photovoltaic energy storage charging system also includes a charging pile and an energy storage battery. The control device is connected to the charging pile, the energy storage battery, and the grid common connection point, respectively. The method includes:

[0092] Step 101: When the charging pile is started, obtain the current operating power of the charging pile.

[0093] The energy dispatching method can be implemented by control equipment in the photovoltaic energy storage charging system, such as the photovoltaic-energy storage inverter (Hybrid) in the system. Figure 2 As shown, Figure 2A schematic diagram of a photovoltaic energy storage charging system according to an embodiment of the present invention is shown. The photovoltaic energy storage charging system includes a control device 201, a photovoltaic module 202, an energy storage battery 203, a critical load 204, and a switchable load 205. The system also includes a charging pile 206. The control device is connected to the photovoltaic module, the energy storage battery, the critical load, the switchable load, and the charging pile, and is also connected to the grid's point of common coupling 207. The critical load includes one or more electrical devices that cannot be powered off during use; the switchable load includes one or more electrical devices that can be powered off during use. The photovoltaic module generates electricity under sunlight conditions, providing power to the entire photovoltaic energy storage charging system, and the energy storage battery stores excess energy within the system. The control device is connected to the PCC (Power Control Center). When the power in the photovoltaic energy storage charging system is insufficient, the control device can obtain power from the grid through the PCC to supplement the power of the photovoltaic energy storage charging system. Conversely, when the power in the photovoltaic energy storage charging system is sufficient, the excess power in the photovoltaic energy storage charging system can be transmitted to the grid through the PCC. The charging pile is used to charge electrical equipment, such as electric vehicles. The charging pile is connected to the electrical equipment, and after charging is started, it transmits the power from the photovoltaic energy storage charging system to the electrical equipment. The control device can dispatch power among photovoltaic modules, energy storage batteries, important loads, charging piles, switchable loads, and the grid. The specific structure of the photovoltaic energy storage charging system can be set according to requirements; this embodiment does not impose any limitations on this.

[0094] In this embodiment, the control device is connected to the charging pile and can monitor the status of the charging pile. After detecting that the charging pile has started charging, it obtains the current operating power of the charging pile. The current operating power is the actual current operating power of the charging pile during the process of delivering electrical energy to the electric vehicle, and can be represented by the symbol Pev. For example, the charging pile can charge the electrical equipment according to a preset current operating power, and after the charging pile starts, it can send the current operating power to the control device. The specific method for obtaining the current operating power can be set according to requirements, and this embodiment does not limit it.

[0095] Step 102: Obtain the first power difference between the upper limit of the charging pile's operating power and the current operating power.

[0096] In one embodiment, when the control device detects that the PCC is in an output state, it can obtain a first power difference between the charging pile's operating power limit and its current operating power. The output state indicates that there is excess electrical energy in the photovoltaic energy storage charging system. The photovoltaic energy storage charging system outputs electrical energy to the grid through the PCC. When the control device detects that the PCC's power is greater than 0, it determines that excess electrical energy is being transmitted to the grid through the PCC. The PCC's power at this time is the output power, which can be represented by the symbol Ppcc1. The operating power limit is the maximum power that the charging pile can operate at, which can be represented by the symbol Pevmax. The control device can obtain the charging pile's operating power limit in advance, or send a power acquisition request to the charging pile after determining that the charging pile has started, to obtain the charging pile's operating power limit. After obtaining the operating power limit, the control device can calculate the difference between the operating power limit and the charging pile's current operating power to obtain the first power difference, which is (Pevmax - Pev). The first power difference represents the power that the charging pile can currently increase, that is, the power that the photovoltaic energy storage charging system can currently increase its power consumption.

[0097] Step 103: If the output power at the grid common coupling point does not exceed the first power difference, and the energy storage battery is in a charging or standby state, reduce the output power and / or the charging power of the energy storage battery, and increase the current operating power.

[0098] The increased current operating power is less than or equal to the upper limit of operating power. The sum of the decrease in output power and the decrease in charging power can be the same as the increase in current operating power to maintain the power balance of the photovoltaic energy storage system. When the energy storage battery is charging, the photovoltaic energy storage charging system charges the energy storage battery, and the charging power of the energy storage battery can be represented by the symbol Pbat1. When the energy storage battery is in standby mode, the energy storage battery neither charges nor discharges, and both the charging power and the discharging power of the energy storage battery are 0. When the energy storage battery is discharging, the energy storage battery provides electrical energy to the photovoltaic energy storage charging system, and the discharging power of the energy storage battery can be represented by the symbol Pbat2.

[0099] In this embodiment, when the control device determines that the PCC is in an output state, it acquires the output power of the PCC. Simultaneously, the control device compares the output power of the PCC with a first power difference. When the output power of the PCC is less than or equal to the first power difference, i.e., Ppcc1 ≤ Pevmax - Pev, it indicates that the power transmitted to the grid through the PCC can be transferred to the charging pile, that is, the electrical energy output through the PCC is transferred to the electrical equipment connected to the charging pile. After determining that Ppcc1 ≤ Pevmax - Pev, the state of the energy storage battery can be determined. When the energy storage battery is determined to be in a standby state, it can be determined that the photovoltaic energy storage charging system is outputting electrical energy to the grid. When the energy storage battery is in a charging state, it can be determined that the photovoltaic energy storage charging system is outputting electrical energy to the grid and simultaneously charging the energy storage battery.

[0100] When the control device determines that the output power of the PCC is less than or equal to a first power difference and the energy storage battery is charging, it can reduce the charging power of the energy storage battery and / or reduce the output power of the PCC. For example, when Ppcc1 = (Pevmax - Pev), the output power of the PCC can be reduced by (Pevmax - Pev), that is, the output power of the PCC can be reduced to 0, so that the photovoltaic energy storage charging system does not output power to the grid, and the current operating power of the charging pile can be increased by (Pevmax - Pev), that is, the current operating power of the charging pile can be increased to the upper limit of the operating power, maintaining the power balance of the photovoltaic energy storage charging system. When Ppcc1 < (Pevmax - Pev), the output power of the PCC can be reduced by A1, the charging power of the energy storage battery can be reduced by A2, and the current operating power of the charging pile can be increased by A3, A1 + A2 = A3, to maintain the power balance of the photovoltaic energy storage charging system, while controlling the increased current operating power to be less than or equal to Pevmax, to prevent the current operating power of the charging pile from exceeding the rated maximum power. Alternatively, when Ppcc1 < (Pevmax - Pev), the output power of PCC remains constant, the charging power of the energy storage battery is reduced by A2, and the current operating power of the charging pile is increased by A3, where A2 = A3, to maintain the power balance of the photovoltaic energy storage charging system. Simultaneously, the increased current operating power is controlled to be less than or equal to Pevmax. The specific values ​​of A1, A2, and A3 can be set according to requirements. The methods for reducing the charging power and / or output power of the energy storage battery and increasing the current operating power can include, but are not limited to, the examples above.

[0101] In cases where the output power at the point of common coupling is less than or equal to the first power difference, if the energy storage battery is in standby mode, the energy storage battery state can be kept unchanged, the output power of the PCC can be reduced, and the current operating power of the charging pile can be increased.

[0102] Optionally, the method may further include:

[0103] If the energy storage battery is in a discharging state and the output power does not exceed the first power difference, the output power will be reduced to 0 and the current operating power will be increased.

[0104] If the output power is greater than the first power difference, reduce the output power and increase the current operating power;

[0105] The increased current operating power is less than or equal to the upper limit of operating power. The decrease in output power can be the same as the increase in current operating power to maintain the power balance of the photovoltaic energy storage system.

[0106] like Figure 3 As shown, Figure 3 This diagram illustrates a flowchart of an energy dispatching method according to an embodiment of the present invention. When the power storage device (PCC) is in an output state, it acquires the output power Ppcc1 or input power Ppcc2 of the PCC, and also acquires the current operating power Pev of the charging pile and the charging power Pbat1 or discharging power Pbat2 of the energy storage battery. When the PCC is in an output state and Ppcc1 is greater than 0, the control device compares the output power of the PCC with a first power difference. When the output power of the PCC is less than or equal to the first power difference (i.e., Ppcc1 ≤ Pevmax - Pev), it indicates that the power transmitted to the grid through the PCC can be transferred to the charging pile, i.e., the electrical energy output through the PCC is transferred to the electrical equipment connected to the charging pile. After determining that Ppcc1 ≤ Pevmax - Pev, the state of the energy storage battery can be further determined. When the output power is less than or equal to the first power difference and the energy storage battery is in a discharging or standby state, the control device can reduce the output power of the PCC to 0 and increase the current operating power of the charging pile by Ppcc1 to maintain the power balance of the photovoltaic energy storage charging system. During the operation of a photovoltaic energy storage charging system, reducing the output power of the PCC and increasing the current operating power of the charging pile can meet the user's demand for fast charging.

[0107] In one embodiment, when the output power of the PCC is greater than a first power difference, the control device can reduce the output power of the PCC and increase the current operating power of the charging pile. When the control device determines that Ppcc1 > Pevmax - Pev, it can reduce the output power of the PCC while simultaneously increasing the current operating power of the charging pile. The increase in current operating power is X, and when the decrease in output power is X, the increased current operating power of the charging pile is (Pev + X), and the decreased output power of the PCC is (Ppcc1 - X). Figure 3As shown, the current operating power of the charging pile can be increased to its upper limit, allowing it to operate at that limit. In this case, the current operating power of the charging pile is Pevmax, and the output power of the PCC is Ppcc1 - (Pevmax - Pev). When the output power of the PCC exceeds the first power difference, based on the sum of the charging power and the output power, the output power of the PCC is reduced, increasing the current operating power of the charging pile, thus meeting the user's fast charging needs.

[0108] Optionally, the steps of reducing the charging power and / or output power of the energy storage battery and increasing the current operating power can be achieved in the following way:

[0109] Obtain the first total power sum of charging power and output power;

[0110] If the sum of the first power values ​​is greater than the first power difference, the output power is adjusted to 0, the charging power is reduced, and the current operating power is increased to the upper limit of the operating power.

[0111] If the first total power is less than or equal to the first power difference, the output power and charging power are reduced to 0, and the current operating power is increased by the first total power.

[0112] In one embodiment, when it is determined that the output power of the PCC is less than or equal to a first power difference and the energy storage battery is in a charging or standby state, the first power sum between the charging power of the energy storage battery and the output power of the PCC can be calculated first, namely Pbat1+Ppcc1.

[0113] like Figure 3 As shown, when the first total power is greater than the first power difference, i.e., (Ppcc1 + Pbat1) > (Pevmax - Pev), the output power of the PCC is reduced to 0, the current operating power of the charging pile is increased to Pevmax, and the charging power of the energy storage battery is reduced by (Pevmax - Pev - Ppcc1) to maintain the power balance of the photovoltaic energy storage charging system. Conversely, when the first total power is less than or equal to the first power difference, i.e., (Ppcc1 + Pbat1) ≤ (Pevmax - Pev), the output power of the PCC is reduced to 0, the charging power of the energy storage battery is reduced to 0, and the current operating power of the charging pile is increased by (Ppcc1 + Pbat1).

[0114] In this embodiment of the invention, when the output power of the PCC is less than or equal to the first power difference, the current operating power of the charging pile is increased based on the sum of the charging power and the output power, the output power of the PCC is reduced to 0, and the charging power of the energy storage battery is reduced, or both the output power of the PCC and the charging power of the energy storage battery are reduced to 0. The increased current operating power of the charging pile can enable the charging pile to quickly charge the electrical equipment, meet the user's fast charging needs, and at the same time, reducing the number of charge and discharge cycles of the energy storage battery can extend the service life of the energy storage battery.

[0115] Specifically, when the output power at the grid common coupling point is less than or equal to the first power difference, if the energy storage battery is in standby mode, the state of the energy storage battery can remain unchanged, thereby reducing the number of charge and discharge cycles of the energy storage battery.

[0116] In summary, in this embodiment of the invention, when the charging pile is activated, the current operating power of the charging pile is obtained, and a first power difference between the upper limit of the charging pile's operating power and the current operating power is obtained. If the output power of the point of common coupling (PCC) is less than or equal to the first power difference, and the energy storage battery is in a charging or standby state, the output power and / or the charging power of the energy storage battery are reduced, and the current operating power is increased. When the PCC is in the output state, increasing the current operating power of the charging pile and reducing the charging power of the energy storage battery can reduce the number of charge-discharge cycles of the energy storage battery, extend its service life, and thus reduce the operating cost of the photovoltaic energy storage charging system. At the same time, the increased current operating power of the charging pile can meet the user's demand for fast charging.

[0117] Optionally, the method may further include:

[0118] Obtain the second power difference between the lower limit of the charging pile's operating power and the current operating power;

[0119] If the input power at the point of common coupling is greater than the second power difference, the current operating power and the input power will be reduced by the same amount.

[0120] The reduced current operating power is not lower than the lower operating power limit. When the PCC is in input mode, it indicates that the power in the photovoltaic energy storage charging system is insufficient, and the photovoltaic energy storage charging system is obtaining power from the grid through the PCC. The lower operating power limit is the lowest power that the charging pile can operate at, and it can be represented by the symbol Pevmin. The control equipment can obtain the lower operating power limit of the charging pile in advance, or after determining that the charging pile has been started, it can send a power acquisition request to the charging pile to obtain the lower operating power limit of the charging pile.

[0121] In this embodiment, when the PCC is detected to be in an input state, the control device can obtain a second power difference between the lower limit of the charging pile's operating power and the current operating power. After detecting and determining that the charging pile has started, the control device can also detect and determine the state of the PCC. When it detects that the PCC's power is less than 0, it can be determined that the photovoltaic energy storage charging system is obtaining power from the grid through the PCC. The power of the PCC at this time is the input power, which can be represented by the symbol Ppcc2. At this time, the control device can calculate the difference between the lower limit of the operating power and the current operating power of the charging pile to obtain the second power difference, which is (Pev - Pevmin). The second power difference represents the power that the charging pile can reduce at the current moment, that is, the power that the photovoltaic energy storage charging system can reduce its consumption at the current moment. Furthermore, if the input power of the PCC is greater than the second power difference, the control device can reduce the current operating power of the charging pile and the input power of the PCC by the same amount. For example, the current operating power of the charging pile and the input power of the PCC can be reduced by X at the same time. The specific value of X can be set according to the requirements to ensure that the current operating power after the reduction is not lower than the lower limit of the operating power.

[0122] like Figure 3 As shown, when the input power at the point of common coupling (PCC) is greater than the second power difference (Ppcc2 > Pev - Pevmin), the current operating power of the charging pile can be reduced to the lower limit of the operating power. This means adjusting the current operating power of the charging pile to Pevmin at the current moment, and simultaneously reducing the input power at PCC by Pev - Pevmin. It should be noted that when PCC is in input mode, the input power is generally negative. In this embodiment, the input power Ppcc2 represents the absolute value of the input power.

[0123] In this embodiment of the invention, when the point of common coupling (PCC) is in the input state, based on the power difference between the lower limit of the charging pile's operating power and its current operating power, the current operating power of the charging pile is reduced, and the input power of the PCC is also reduced. This reduces the amount of electricity obtained from the grid, thereby lowering the operating cost of the photovoltaic energy storage charging system. When the input power of the PCC is reduced by a second power difference, the amount of electrical energy obtained from the grid can be minimized, thus minimizing costs.

[0124] Optionally, the method may further include:

[0125] If the input power is less than or equal to the second power difference, and the energy storage battery is in a charging state, the input power will be adjusted to 0, and the current operating power will be reduced by the input power.

[0126] If the input power is less than or equal to the second power difference, and the energy storage battery is in a discharging or standby state, the input power and / or the discharge power of the energy storage battery will be reduced, and the current operating power will be reduced.

[0127] The reduced current operating power should not be lower than the lower limit of operating power. The sum of the reductions in input power and discharge power can be the same as the reduction in current operating power to maintain the power balance of the photovoltaic energy storage system.

[0128] In this embodiment, if the PCC is in the input state and the energy storage battery is in the charging state, it indicates that the photovoltaic energy storage charging system has insufficient power and the energy storage battery cannot discharge. Figure 3 As shown, the input power of PCC can be adjusted to 0 at this time, reducing the current operating power of the charging pile by Ppcc2, that is, reducing the current operating power of the charging pile to reduce the amount of electricity obtained from the grid, thereby reducing the operating cost of the photovoltaic energy storage charging system.

[0129] In this context, when the input power of the PCC is less than or equal to the second power difference, and the energy storage battery is in a discharging or standby state, it means that the sum of the discharge power of the energy storage battery and the input power of the PCC is less than the power that the energy storage system can currently reduce. For example, when the input power of the PCC is less than or equal to the second power difference (Ppcc2≤Pev-Pevmin), and the energy storage battery is in a discharging or standby state, when Ppcc2=(Pev-Pevmin), the input power of the PCC can be reduced by (Pev-Pevmin), that is, the input power of the PCC is adjusted to 0, so that the photovoltaic energy storage charging system does not draw power from the grid. At the same time, the discharge power of the energy storage battery remains unchanged, and the current operating power of the charging pile is reduced by (Pev-Pevmin), that is, the current operating power of the charging pile is reduced to the lower limit of the operating power, thus maintaining the power balance of the photovoltaic energy storage charging system. When Ppcc2 > (Pev - Pevmin), the input power of the PCC can be reduced by C1, the discharge power of the energy storage battery by C2, and the current operating power of the charging pile by C3, where C1 + C2 = C3, to maintain the power balance of the photovoltaic energy storage charging system. Simultaneously, the reduced current operating power is controlled to be greater than or equal to Pevmin to prevent the current operating power of the charging pile from falling below the rated minimum power. Alternatively, when Ppcc2 > (Pev - Pevmin), the output power of the PCC remains unchanged, the charging power of the energy storage battery is reduced by D2, and the current operating power of the charging pile is reduced by D3, where D2 = D3, to maintain the power balance of the photovoltaic energy storage charging system. The specific values ​​of D1, D2, and D3 can be set according to requirements. Methods for reducing the discharge power of the energy storage battery and / or the output power of the PCC, and for reducing the current operating power, can include, but are not limited to, the examples above.

[0130] In cases where the input power at the point of common coupling is less than or equal to the second power difference, if the energy storage battery is in standby mode, the energy storage battery state can be kept unchanged, thereby reducing the input power of the PCC and the current operating power of the charging pile.

[0131] Optionally, the steps of reducing the input power and / or the discharge power of the energy storage battery, and reducing the current operating power, may include:

[0132] Determine the second power sum of the input power and the discharge power;

[0133] If the sum of the second power is greater than the difference of the second power, the input power is adjusted to 0, the discharge power is reduced, and the current operating power is adjusted to the lower limit of the operating power.

[0134] If the sum of the second power is less than or equal to the difference of the second power, both the input power and the discharge power are adjusted to 0, and the current operating power is reduced by the sum of the second power.

[0135] In one embodiment, when the control device determines that the input power of the PCC is less than or equal to a second power difference and the energy storage battery is in a discharging state, it can first calculate the second power sum of the energy storage battery's discharge power and the PCC's input power, which is Pbat2 + Ppcc2. Figure 3 As shown, when the second total power is greater than the second power difference, i.e., (Ppcc2 + Pbat) > (Pev - Pevmin), the input power of the PCC can be adjusted to 0, the current operating power of the charging pile can be adjusted to Pevmin, and the discharge power of the energy storage battery can be reduced by (Pev - Pevmin - Ppcc2) to maintain the power balance of the photovoltaic energy storage charging system. Correspondingly, when the second total power is less than or equal to the second power difference, i.e., (Ppcc2 + Pbat2) ≤ (Pev - Pevmin), the input power of the PCC can be reduced to 0, the discharge power of the energy storage battery can be reduced to 0, and the current operating power of the charging pile can be reduced by (Ppcc2 + Pbat2).

[0136] In this embodiment of the invention, when the PCC is in the input state, the input power of the PCC is less than or equal to the second power difference, and the energy storage battery is in the charging or standby state, reducing the input power of the PCC can reduce the operating cost of the photovoltaic energy storage charging system, reduce the discharge power of the energy storage battery, and reduce the number of charge-discharge cycles of the energy storage battery, thereby extending the service life of the energy storage battery. When the input power of the PCC is reduced to 0, the operating cost of the photovoltaic energy storage charging system can be reduced to the minimum.

[0137] Optionally, the method may further include:

[0138] If the energy storage battery is in a discharging or standby state when the power at the point of common coupling of the power grid is 0, the current operating power and the discharge power of the energy storage battery will be reduced by the same amount; the reduced current operating power will not be lower than the lower limit of the operating power of the charging pile.

[0139] If the energy storage battery is charging when the power at the point of common coupling is 0, the charging power of the energy storage battery will be reduced and the current operating power will be increased; the increased current operating power will not exceed the upper limit of the operating power.

[0140] When the power of the PCC is 0, it means that the PCC point is in a zero-point state. The photovoltaic energy storage charging system neither outputs power to the grid through the PCC nor draws power from the grid through the PCC. In other words, there is neither excess nor insufficient power in the photovoltaic energy storage charging system. The decrease in charging power can be the same as the increase in the current operating power to maintain the power balance of the photovoltaic energy storage system.

[0141] In this embodiment, when the control device detects and determines that the PCC power is 0 and the energy storage battery is in a discharging state, it can reduce the current operating power of the charging pile and the discharge power of the energy storage battery, and the reduction in both is the same, in order to maintain the power balance of the photovoltaic energy storage charging system. Figure 3 As shown, when the discharge power of the energy storage battery is less than or equal to the second power difference, i.e., Pbat2 ≤ Pev - Pevmin, the discharge power of the energy storage battery can be reduced to 0, and the current operating power of the charging pile can be reduced by Pbat2. When the discharge power of the energy storage battery is greater than the second power difference, i.e., Pbat2 > Pev - Pevmin, the discharge power of the energy storage battery can be reduced, and the current operating power of the charging pile can be adjusted to Pevmin, with the reduction in the discharge power of the energy storage battery being Pev - Pevmin.

[0142] Similarly, when the control equipment detects and determines that the PCC power is 0 and the energy storage battery is in a charging state, it can reduce the charging power of the energy storage battery and increase the current operating power of the charging pile. The reduction in charging power is the same as the increase in current operating power. Figure 3As shown, when the charging power of the energy storage battery is less than or equal to the first power difference, i.e., Pbat1 ≤ Pevmax - Pev, the charging power of the energy storage battery can be reduced to 0, while the current operating power of the charging pile is increased by Pbat1. When the charging power of the energy storage battery is greater than the first power difference, i.e., Pbat1 > Pevmax - Pev, the current operating power of the charging pile can be adjusted to Pevmax, while the charging power of the energy storage battery is reduced by Pevmax - Pev.

[0143] In particular, if the power at the point of common coupling of the power grid is 0 and the energy storage battery is in standby mode, the state of the energy storage battery can remain unchanged, and the operating power of the charging pile can remain unchanged.

[0144] In this embodiment of the invention, when the power at the grid common coupling point is 0 and the energy storage battery is in a discharging state, the discharge power of the energy storage battery is reduced; when the power at the grid common coupling point is 0 and the energy storage battery is in a charging state, the charging power of the energy storage battery is reduced. This can reduce the number of charge and discharge cycles of the energy storage battery, thereby extending the service life of the energy storage battery.

[0145] Reference Figure 4 , Figure 4 This invention illustrates a flowchart of another energy dispatching method according to an embodiment of the present invention. The method is applied to a control device in a photovoltaic energy storage charging system. The photovoltaic energy storage charging system also includes a charging pile, an energy storage battery, and a switchable load. The control device is connected to the charging pile, the energy storage battery, and the switchable load, respectively. The method includes:

[0146] Step 401: When the charging pile is started, turn off the shut-off load and obtain the current operating power of the charging pile and the load power of the shut-off load.

[0147] Step 402: Obtain the third power difference between the load power and the current operating power.

[0148] The structure of the photovoltaic energy storage charging system can be referred to in the example above, and will not be described in detail in this embodiment.

[0149] In this embodiment, the control device can monitor the status of the charging pile and the switchable load, and obtain the current operating power of the charging pile and the load power of the switchable load in real time. The load power is the current operating power of the switchable load, which can be represented by the symbol Pload. After detecting that the charging pile has started outputting electrical energy to the electrical equipment, the control device determines that the charging pile has started. After determining that the charging pile has started, the switchable load can be turned off. Furthermore, the difference between the load power of the switchable load and the current operating power of the charging pile can be calculated to obtain a third power difference, which is Pload - Pev.

[0150] Step 403: Keep the current operating power unchanged and adjust the charging and discharging power of the energy storage battery based on the third power difference to maintain the power balance of the photovoltaic energy storage charging system.

[0151] In this embodiment, after the switchable load is turned off, its load power is supplied to the charging pile to control its operation. For example... Figure 5 As shown, Figure 5 The diagram illustrates a flow chart of a control method for an energy storage battery according to an embodiment of the present invention. When the current operating power is greater than the load power, the load power can be transferred to the charging pile. Furthermore, when the load power cannot meet the power requirements of the charging pile, power is first obtained from the energy storage battery and then from the power grid. Conversely, when the load power meets the power requirements of the charging pile, the remaining power can be provided to the energy storage battery.

[0152] Optionally, the step of adjusting the charging and discharging power of the energy storage battery based on the third power difference includes:

[0153] If the energy storage battery is in a discharging state when the current operating power is less than or equal to the load power, the discharge power of the energy storage battery will be reduced by the third power difference.

[0154] If the current operating power is less than or equal to the load power and the energy storage battery is in standby mode, the energy storage battery is controlled to charge at a charging power not exceeding the third power difference.

[0155] If the current operating power is less than or equal to the load power, and the energy storage battery is in a charging state, the charging power of the energy storage battery will be increased by the third power difference.

[0156] When the current operating power is less than or equal to the load power, it means that the power saved by shutting down the switchable load can meet the power requirements of the charging pile. When the energy storage battery is charging, the controller can control the charging of the energy storage battery. When the energy storage battery is discharging, the controller can control the reduction of the charging power of the energy storage battery. When the energy storage battery is in standby mode, the controller can control the energy storage battery to remain in standby mode or to charge.

[0157] like Figure 6 As shown, Figure 6 This diagram illustrates a flowchart of another energy storage battery control method according to an embodiment of the present invention. When the current operating power is less than or equal to the load power, i.e., Pev ≤ Pload, the control device first determines the charging and discharging state of the energy storage battery, and then controls the charging and discharging power of the energy storage battery. For example, when Pev ≤ Pload, the control device can determine that the load power can meet the power requirements of the charging pile. If the third power difference is equal to 0, it indicates that the load power can meet the power requirements of the charging pile, and the state of the energy storage battery can remain unchanged. Conversely, if Pev ≤ Pload, it indicates that the load power not only meets the power requirements of the charging pile but also has redundant power, which is the third power difference Pload - Pev. Further, if the energy storage battery is in a discharging state, the discharging power of the energy storage battery can be reduced by the amount of reduction being the third power difference, i.e., reducing Pload - Pev, to maintain the power balance of the photovoltaic energy storage charging system. Similarly, as... Figure 5 As shown, if the detection determines that the energy storage battery is in standby mode, redundant power can be injected into the battery to control it to switch from standby to charging mode. The charging power can be equal to the third power difference Pload-Pev to maintain the power balance of the photovoltaic energy storage charging system, or the charging power can be less than the third power difference. Similarly, as... Figure 5 As shown, when the energy storage battery is charging, a third power difference, namely Pload-Pev, can be added to the charging power of the energy storage battery to control the battery to continue charging and maintain the power balance of the photovoltaic energy storage charging system. Specifically, during the battery charging and discharging process, the battery's (State of Charge, SOC) value can be used to determine whether to charge or discharge.

[0158] In this embodiment of the invention, after the charging pile is started, the control device shuts off the switchable load, and when the load power of the switchable load is greater than or equal to the current operating power of the charging pile, it reduces the charging power of the energy storage battery or increases the charging power of the energy storage battery, which can improve the utilization rate of electrical energy in the photovoltaic energy storage charging system.

[0159] Optionally, the step of adjusting the charging and discharging power of the energy storage battery based on the third power difference further includes:

[0160] If the current operating power is greater than the load power, and the energy storage battery is in a discharging or standby state, obtain the discharge redundancy power of the energy storage battery.

[0161] If the discharge redundant power is greater than or equal to the third power difference, the discharge power of the energy storage battery will be increased by the third power difference.

[0162] When the discharge redundancy power is less than the third power difference, the energy storage battery is controlled to discharge at the maximum discharge power, and the input power of the grid common coupling point is controlled to increase by the first power value; the first power value is the difference between the discharge redundancy power and the third power difference.

[0163] In one embodiment, when the current operating power of the charging pile exceeds the load power of the shut-off load, it indicates that the load power cannot meet the power demand of the charging pile, and power needs to be drawn from the energy storage battery. At this time, if the energy storage battery is in a discharging state, it means that the energy storage battery is already providing power to the photovoltaic energy storage charging system, and it is necessary to determine the further discharge capacity that the energy storage battery can provide, i.e., the discharge redundancy power. If the energy storage battery is in a standby state, it means that the energy storage battery has not yet provided power to the photovoltaic energy storage charging system, and it is necessary to determine the amount of power that the photovoltaic energy storage battery can provide to the photovoltaic energy storage charging system at this time, i.e., the discharge redundancy power. After determining the discharge redundancy power, it is necessary to determine whether the sum of the discharge redundancy rate and the load power of the shut-off load can meet the power demand of the charging pile.

[0164] like Figure 7 As shown, Figure 7This diagram illustrates a flowchart of another energy storage battery control method according to an embodiment of the present invention. When Pev > Pload, if it is determined that the energy storage battery is in a discharging state, the current SOC of the energy storage battery can be obtained. The discharge current corresponding to the battery's state of charge value is obtained from a preset energy storage battery control parameter table. Based on the discharge current and the current discharge voltage of the energy storage battery, the maximum discharge power of the energy storage battery can be calculated. The maximum discharge power can be represented by the symbol Pbatmax. The maximum discharge power minus the current discharge power is the discharge power that the energy storage battery can increase at the current moment, i.e., the discharge redundancy power Pbatmax - Pbat2. If the discharge redundancy power is greater than or equal to the third power difference, i.e., Pbatmax - Pbat2 ≥ Pev - Pload, it indicates that the sum of the discharge redundancy power and the load power can meet the power requirements of the charging pile. At this time, the discharge power of the energy storage battery can be increased by the third power difference, which can maintain the power balance of the photovoltaic energy storage charging system. Similarly, when Pev > Pload, if the energy storage battery is determined to be in standby mode, its discharge redundancy power can be determined. If the discharge redundancy power is greater than or equal to the third power difference, it indicates that the sum of the discharge redundancy power and the load power can meet the power requirements of the charging pile. In this case, the energy storage battery can be switched from standby mode to discharge mode, and the discharge power can be adjusted to the third power difference to meet the power balance of the photovoltaic energy storage charging system. Further, when the discharge redundancy power is less than the third power difference, i.e., Pbatmax - Pbat2 < Pev - Pload, it indicates that the sum of the discharge redundancy power and the load power cannot meet the power requirements of the charging pile. In this case, the energy storage battery can be controlled to discharge at its maximum discharge power, and power can be obtained from the grid through the PCC point. If the power of the PCC is 0 or less than 0, the input power of the PCC point is increased. The increase in input power is the difference between the discharge redundancy power and the third power difference, i.e., the first power value is Pev - Pload - (Pbatmax - Pbat2).

[0165] In this embodiment of the invention, when the current operating power of the charging pile is greater than the load power and the energy storage battery is in a discharging or standby state, the discharge redundancy power of the energy storage battery is obtained. Based on the discharge redundancy power, power is preferentially obtained from the energy storage battery, and then power is obtained from the grid through the PCC, which can reduce the operating cost of the photovoltaic energy storage charging system.

[0166] Optionally, the step of adjusting the charging and discharging power of the energy storage battery based on the third power difference may include:

[0167] If the current operating power is greater than the load power, and the energy storage battery is in a charging state, determine the maximum power reduction of the charging power of the energy storage battery.

[0168] If the maximum power reduction is greater than or equal to the third power difference, the charging power will be reduced by the third power difference.

[0169] If the maximum power drop is less than the third power difference, and the energy storage battery is determined to be dischargeable based on its state of charge value, then the energy storage battery is switched to a discharge state, and a fourth power difference is obtained between the maximum power drop and the third power difference.

[0170] When the maximum discharge power of the energy storage battery is greater than or equal to the fourth power difference, the energy storage battery is controlled to discharge at the fourth power difference.

[0171] When the maximum discharge power is less than the fourth power difference, the energy storage battery is controlled to discharge at the maximum discharge power, and the input power of the grid common coupling point is controlled to increase by a second power value; the second power value is the difference between the fourth power difference and the maximum discharge power.

[0172] In one embodiment, when the energy storage battery is charging, it indicates that there is excess electrical energy in the photovoltaic energy storage charging system, and electrical energy is being input into the energy storage battery. At this time, if the current operating power of the charging pile is greater than the load power of the load that can be shut off, some or all of the electrical energy input to the energy storage battery can be transferred to the charging pile, thus satisfying the basic charging needs of the energy storage battery and the needs of the charging pile.

[0173] Specifically, when the SOC value of the energy storage battery is greater than or equal to the initial SOC value, it indicates that the battery can stop charging and transition from charging to standby mode. When the SOC value is greater than the initial SOC value and greater than or equal to the target SOC value, it indicates that the battery can transition from charging to discharging. The initial SOC value is the minimum SOC value, usually set by the manufacturer. The target SOC value is usually a user-defined SOC value, with the initial SOC value being less than the target SOC value. Users can set the minimum charging power for the energy storage battery when the SOC value is less than the initial SOC value. The minimum charging power can be represented by the symbol Pbat1min, and this minimum charging power meets the minimum charging requirements of the energy storage battery when the SOC value is less than the initial SOC value. Figure 7As shown, when the control device determines that the current operating power of the charging pile is greater than the load power and the energy storage battery is in a charging state, it first obtains the battery's SOC value. When the SOC value is less than the initial SOC value, it determines that the energy storage battery needs to continue charging. At this time, it obtains the current charging power Pbat1 and the pre-stored minimum charging power Pbat1min. When Pbat1 > Pbat1min, it calculates the difference between the current charging power Pbat1 and the minimum charging power Pbat1min to obtain the maximum power drop, which is Pbat1 - Pbat1min. When the SOC value is greater than the initial SOC value, it determines that the energy storage battery can stop charging, and the charging power can be set to 0. Furthermore, it can determine that the maximum power drop is the current charging power Pbat1. At this point, if the maximum power reduction is greater than or equal to the third power difference, i.e., Pbat1-Pbat1min≥Pev-Pload or Pbat1≥Pev-Pload, it means that reducing the charging power of the energy storage battery can meet the power requirements of the charging pile. The charging power of the energy storage battery can be reduced by the third power difference to meet the power requirements of the charging pile.

[0174] like Figure 7 As shown, if the maximum power reduction is less than the third power difference, it indicates that even if the charging power of the energy storage battery is reduced to the minimum value, it cannot meet the power requirements of the charging pile. In this case, the charging power of the energy storage battery can be reduced to the minimum value; that is, when the SOC value is lower than the initial SOC value, charge at the minimum charging power; when the SOC value is greater than or equal to the initial SOC value, the charging power is 0. Furthermore, the SOC value can be used to determine whether the energy storage battery can discharge. When the SOC value is less than the target SOC value, it indicates that the energy storage battery cannot discharge. In this case, the charging power of the energy storage battery can be reduced by the maximum power reduction, and when the PCC power is 0 or less than 0, the PCC input power can be increased by an increment of Pev - Pload - Pbat1.

[0175] Conversely, when the SOC value is greater than or equal to the target SOC value, it is determined that the energy storage battery can switch to a discharge state. At this time, the fourth power difference between the maximum power drop and the third power difference can be obtained, as well as the maximum discharge power Pbatmax that the energy storage battery can achieve at the current moment. Since the SOC value is greater than the initial SOC value and the target SOC value, the maximum power drop is Pbat1, and the fourth power difference is Pev-Pload-Pbat1. After obtaining the maximum amplified power Pbatmax, if the maximum discharge power of the energy storage battery is greater than or equal to the fourth power difference, i.e., Pbatmax≥Pev-Pload-Pbat1, it means that after the energy storage battery discharges, it can meet the power supply requirements of the charging pile, and the energy storage battery can be controlled to switch from the charging state to the discharging state and discharge at the fourth power difference. When Pbatmax<Pev-Pload-Pbat1, it means that when the energy storage battery discharges at maximum power, it cannot meet the power requirements of the charging pile, and it is necessary to obtain power from the grid through the PCC. Therefore, when the control device controls the energy storage battery to discharge at the maximum discharge power Pbatmax when the maximum discharge power is less than the fourth power difference, and when the power of PCC is 0 or less than 0, the input power of PCC is increased by the second power value, which is Pev-Pload-Pbat1-Pbatmax.

[0176] In one embodiment, when it is determined that the maximum power drop of the energy storage battery is 0, power can be directly obtained from the grid through the PCC to meet the power requirements of the charging pile.

[0177] In this embodiment of the invention, when the load power cannot meet the power requirements of the charging pile, if the energy storage battery is in a charging state, the maximum power reduction of the energy storage battery is obtained. When the maximum power reduction is greater than or equal to the third power difference, the charging power of the energy storage battery can be reduced to meet the power requirements of the charging pile. Prioritizing energy acquisition from the energy storage battery avoids directly drawing power from the grid, thus reducing the operating cost of the photovoltaic energy storage charging system. When the maximum power reduction cannot meet the charging pile's requirements, it is first determined whether the energy storage battery can discharge. If the energy storage battery can discharge, it is first discharged to meet the power requirements of the charging pile. Then, power is obtained through the PCC (Power Generation Control Center) to meet the charging pile's requirements, avoiding direct drawing of power from the grid and thus reducing the operating cost of the photovoltaic energy storage charging system.

[0178] In summary, in this embodiment of the invention, when the charging pile is started, the switchable load is turned off, and the current operating power of the charging pile and the load power of the switchable load are obtained. A third power difference between the load power and the current operating power is obtained, the current operating power is kept constant, and the charging and discharging power of the energy storage battery is adjusted based on the third power difference to maintain the power balance of the photovoltaic energy storage charging system. After the charging pile in the photovoltaic energy storage charging system is started, the switchable load is turned off, and the redundant power after the switchable load is turned off is provided to the charging pile. The power balance of the photovoltaic energy storage charging system is adjusted according to the difference between the operating power of the charging pile and the load power of the switchable load. While meeting the charging needs of the charging pile, the power consumption of the entire system can be reduced, thereby reducing the operating cost of the photovoltaic energy storage system.

[0179] Reference Figure 8 , Figure 8 This invention illustrates a flowchart of another energy dispatching method according to an embodiment of the invention. This method is applied to a control device in a photovoltaic energy storage charging system. Upon receiving a first input, the control device can respond to the first input by executing actions such as... Figure 1 The energy dispatching method shown allows the control device to respond to a second input and perform actions such as... Figure 4 The energy dispatching method is illustrated. Exemplarily, the control device can be configured into a first mode and a second mode, where the first input and the second input can be mode switching operations. For example, the control device can integrate a first mode switching button and a second mode switching button. When a user clicks the first mode switching button, the control device can respond to the user's click operation and switch its mode to the first mode; the user's click of the first mode switching button is the first input. When the user clicks the second mode switching button, the control device can respond to the user's click operation and switch its mode to the second mode; the user's click of the second mode switching button is the second input. When the control device is switched to the first mode, the following is executed: Figure 1 The method flow shown, when the control device switches to the second mode, executes as follows: Figure 4 The method flow is shown. The specific forms of the first and second inputs can be set according to requirements, and this embodiment does not impose any restrictions on them.

[0180] Reference Figure 9 This diagram illustrates the structure of an energy dispatching device according to an embodiment of the present invention. The device 900 is a control device installed in a photovoltaic energy storage charging system. The photovoltaic energy storage charging system also includes a charging pile and an energy storage battery. The control device is connected to the charging pile, the energy storage battery, and the grid common connection point, respectively. The device 900 includes:

[0181] The first acquisition module 901 is used to acquire the current operating power of the charging pile when the charging pile is started.

[0182] The second acquisition module 902 is used to acquire the first power difference between the upper limit of the operating power of the charging pile and the current operating power;

[0183] The control module 903 is used to reduce the output power and / or the charging power of the energy storage battery and increase the current operating power if the energy storage battery is in a charging or standby state, provided that the output power at the grid common coupling point does not exceed a first power difference.

[0184] Among them, the current operating power after the increase is less than or equal to the upper limit of operating power.

[0185] Optionally, the control module 903 is further configured to, if the energy storage battery is in a discharging state and the output power is reduced to 0, and the current operating power is increased if the output power does not exceed the first power difference; and to, if the output power is greater than the first power difference, to, reduce the output power and increase the current operating power.

[0186] The increased current operating power is equal to the upper limit of operating power.

[0187] Optionally, the control module 903 is specifically used to obtain a first power sum of charging power and output power; if the first power sum is greater than a first power difference, adjust the output power to 0, reduce the charging power, and increase the current operating power to the upper limit of operating power; if the first power sum is less than or equal to the first power difference, reduce the output power and charging power to 0, and increase the current operating power to the first power sum.

[0188] Optionally, the control module 903 is further configured to obtain a second power difference between the lower limit of the operating power of the charging pile and the current operating power; if the input power at the point of common coupling of the power grid is greater than the second power difference, the current operating power and the input power are reduced by the same amount; wherein the reduced current operating power is not lower than the lower limit of the operating power.

[0189] Optionally, the control module 903 is further configured to, when the input power is less than or equal to the second power difference, adjust the input power to 0 and reduce the current operating power if the energy storage battery is in a charging state. When the input power is less than or equal to the second power difference, if the energy storage battery is in a discharging or standby state, reduce the input power and / or the discharge power of the energy storage battery, and reduce the current operating power; wherein the reduced current operating power is not lower than the lower limit of the operating power.

[0190] Optionally, the control module 903 is specifically configured to obtain a second power sum of the input power and the discharge power; if the second power sum is greater than a second power difference, reduce the input power to 0, reduce the discharge power, and reduce the current operating power to the lower limit of the operating power; if the second power sum is less than or equal to the second power difference, reduce both the input power and the discharge power to 0, and reduce the current operating power to less than the second power sum.

[0191] Optionally, the control module 903 is specifically configured to, when the power at the grid common coupling point is 0, if the energy storage battery is in a discharging or standby state, reduce the current operating power and the discharging power of the energy storage battery by the same amount; wherein the reduced current operating power is not lower than the lower limit of the charging pile's operating power; when the power at the grid common coupling point is 0, if the energy storage battery is in a charging state, reduce the charging power of the energy storage battery and increase the current operating power; wherein the increased current operating power is not higher than the upper limit of the operating power.

[0192] Reference Figure 9 This diagram illustrates the structure of another energy dispatching device according to an embodiment of the present invention. The device 1000 is a control device installed in a photovoltaic energy storage charging system. The photovoltaic energy storage charging system also includes a charging pile, an energy storage battery, and a switchable load. The control device is connected to the charging pile, the energy storage battery, and the switchable load, respectively. The device 1000 includes:

[0193] The first acquisition module 1001 is used to shut down the shut-off load when the charging pile is started, and to acquire the current operating power of the charging pile and the load power of the shut-off load.

[0194] The second acquisition module 1002 is used to acquire a third power difference between the load power and the current operating power;

[0195] The control module 1003 is used to maintain the current operating power unchanged and adjust the charging and discharging power of the energy storage battery based on the third power difference in order to maintain the power balance of the photovoltaic energy storage charging system.

[0196] Optionally, the control module 1003 is specifically configured to, when the current operating power is less than or equal to the load power, reduce the discharge power of the energy storage battery by a third power difference if the energy storage battery is in a discharging state; when the current operating power is less than or equal to the load power, control the energy storage battery to charge at a charging power not higher than the third power difference if the energy storage battery is in a standby state; and when the current operating power is less than or equal to the load power, increase the charging power of the energy storage battery by the third power difference if the energy storage battery is in a charging state.

[0197] Optionally, the control device is connected to the grid common coupling point; the control module 1003 is specifically used to, when the current operating power is greater than the load power, if the energy storage battery is in a discharging state or a standby state, obtain the discharge redundancy power of the energy storage battery; if the discharge redundancy power is greater than or equal to a third power difference, increase the discharge power of the energy storage battery by the third power difference; if the discharge redundancy power is less than the third power difference, control the energy storage battery to discharge at the maximum discharge power, and control the input power of the grid common coupling point to increase by a first power value; the first power value is the difference between the discharge redundancy power and the third power difference.

[0198] Optionally, the control device is connected to the grid's point of common coupling (PCC). The control module 1003 is specifically configured to: when the current operating power is greater than the load power, if the energy storage battery is in a charging state, determine the maximum power reduction of the charging power of the energy storage battery; if the maximum power reduction is greater than or equal to a third power difference, reduce the charging power by the third power difference; if the maximum power reduction is less than the third power difference, and if the energy storage battery is determined to be dischargeable based on its state of charge (SOC), switch the energy storage battery to a discharging state and obtain a fourth power difference between the maximum power reduction and the third power difference; if the maximum discharge power of the energy storage battery is greater than or equal to the fourth power difference, control the energy storage battery to discharge at the fourth power difference; if the maximum discharge power is less than the fourth power difference, control the energy storage battery to discharge at the maximum discharge power and control the input power of the PCC to increase by a second power value; the second power value is the difference between the fourth power difference and the maximum discharge power.

[0199] This invention also provides a control device, which includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the energy scheduling method described above.

[0200] This invention also provides a readable storage medium storing a program or instructions, which, when executed by a processor, implement the steps of the energy scheduling method described above.

[0201] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

[0202] Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-mentioned technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-mentioned technical features or their equivalent features without departing from the aforementioned disclosed concept. For example, technical solutions formed by substituting the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An energy scheduling method, characterized by, The application is applied to a control device of a photovoltaic energy storage charging system, the photovoltaic energy storage charging system further comprising a charging pile and an energy storage battery, and the control device is connected with the charging pile, the energy storage battery and a grid public connection point respectively; the method comprises: obtaining a current operating power of the charging pile; obtaining a first power difference between an upper limit of the operating power of the charging pile and the current operating power; if the energy storage battery is in a charging or standby state, reducing the output power and / or the charging power of the energy storage battery and increasing the current operating power when the output power of the grid public connection point is not more than the first power difference; wherein the current operating power after the increase is less than or equal to the upper limit of the operating power.

2. The method of claim 1, wherein, Further comprising: if the energy storage battery is in a discharging state, reducing the output power to 0 and increasing the output power on the basis of the current operating power to obtain a new current operating power when the output power is not more than the first power difference; reducing the output power and increasing the current operating power when the output power is greater than the first power difference; wherein the current operating power after the increase is less than or equal to the upper limit of the operating power.

3. The method of claim 1, wherein, The method further comprises: obtaining a first power sum of the charging power and the output power; adjusting the output power to 0, reducing the charging power and increasing the current operating power to the upper limit of the operating power when the first power sum is greater than the first power difference; reducing the output power and the charging power to 0 and increasing the first power sum on the basis of the current operating power to obtain a new current operating power when the first power sum is less than or equal to the first power difference.

4. The method of claim 1, wherein, The method further comprises: obtaining a second power difference between a lower limit of the operating power of the charging pile and the current operating power; reducing the current operating power and the input power by the same amplitude when the input power of the grid public connection point is greater than the second power difference; wherein the current operating power after the reduction is not lower than the lower limit of the operating power.

5. The method of claim 4, wherein, Further comprising: adjusting the input power to 0 and reducing the input power on the basis of the current operating power to obtain a new current operating power when the input power is less than or equal to the second power difference if the energy storage battery is in a charging state; reducing the input power and / or the discharging power of the energy storage battery and reducing the current operating power when the input power is less than or equal to the second power difference if the energy storage battery is in a discharging or standby state; wherein the current operating power after the reduction is not lower than the lower limit of the operating power.

6. The method of claim 5, wherein, The method further comprises: obtaining a second power sum of the input power and the discharging power; in the case that the second power sum is greater than the second power difference, reducing the input power to 0, reducing the discharging power, and reducing the current operating power to the lower limit of the operating power; in the case that the second power sum is less than or equal to the second power difference, reducing both the input power and the discharging power to 0, and reducing the second power sum based on the current operating power to obtain a new current operating power.

7. The method of claim 1, wherein, The method further comprises: in the case that the power at the grid point of common coupling is 0, if the energy storage battery is in a discharging state, reducing the current operating power and the discharging power of the energy storage battery by the same amplitude; wherein the current operating power after reduction is not lower than the lower limit of the operating power of the charging pile; in the case that the power at the grid point of common coupling is 0, if the energy storage battery is in a charging state, reducing the charging power of the energy storage battery and increasing the current operating power; wherein the current operating power after increase is not higher than the upper limit of the operating power.

8. An energy scheduling method, characterized by, The method is applied to a control device in a photovoltaic energy storage charging system, and the method comprises: in the case that a first input is received, in response to the first input, performing the method according to any one of claims 1-7; the first input is that a user clicks a first mode switching button on the control device.

9. An energy scheduling apparatus, characterized by, A control device is arranged in a photovoltaic energy storage charging system, the photovoltaic energy storage charging system further comprising a charging pile and an energy storage battery, and the control device is connected with the charging pile, the energy storage battery and a grid point of common coupling; the device comprises: a first acquisition module, configured to acquire the current operating power of the charging pile; a second acquisition module, configured to acquire a first power difference between the upper limit of the operating power of the charging pile and the current operating power; a control module, configured to, in the case that the output power at the grid point of common coupling does not exceed the first power difference, if the energy storage battery is in a charging or standby state, reduce the output power and / or the charging power of the energy storage battery, and increase the current operating power; wherein the current operating power after increase is less than or equal to the upper limit of the operating power.

10. The apparatus of claim 9, wherein, The control module is further configured to, in the case that the output power does not exceed the first power difference, if the energy storage battery is in a discharging state, reduce the output power to 0, and increase the output power based on the current operating power to obtain a new current operating power; in the case that the output power is greater than the first power difference, reduce the output power, and increase the current operating power; wherein the current operating power after increase is less than or equal to the upper limit of the operating power.

11. The apparatus of claim 9, wherein, The control module is specifically configured to acquire a first power sum of the charging power and the output power; in the case that the first power sum is greater than the first power difference, adjust the output power to 0, reduce the charging power, and increase the current operating power to the upper limit of the operating power; In a case that the first power sum is less than or equal to the first power difference, the output power and the charging power are reduced to 0, and a new current running power is obtained by increasing the first power sum on the basis of the current running power.

12. The apparatus of claim 9, wherein, The control module is further configured to obtain a second power difference between a lower limit of a running power of the charging pile and the current running power; in a case that an input power of the grid PCC is greater than the second power difference, the current running power and the input power are reduced by the same magnitude; wherein the current running power after the reduction is not less than the lower limit of the running power.

13. The apparatus of claim 12, wherein, In a case that the input power is less than or equal to the second power difference, if the energy storage battery is in a charging state, the input power is adjusted to 0, and a new current running power is obtained by reducing the input power on the basis of the current running power; in a case that the input power is less than or equal to the second power difference, if the energy storage battery is in a discharging or standby state, the input power and / or the discharging power of the energy storage battery are reduced, and the current running power is reduced; wherein the current running power after the reduction is not less than the lower limit of the running power.

14. The apparatus of claim 13, wherein, The control module is specifically configured to obtain a second power sum of the input power and the discharging power; in a case that the second power sum is greater than the second power difference, the input power is reduced to 0, the discharging power is reduced, and the current running power is reduced to the lower limit of the running power; In a case that the second power sum is less than or equal to the second power difference, the input power and the discharging power are both reduced to 0, and a new current running power is obtained by reducing the second power sum on the basis of the current running power.

15. The apparatus of claim 9, wherein, In a case that the power of the grid PCC is 0, if the energy storage battery is in a discharging state, the current running power and the discharging power of the energy storage battery are reduced by the same magnitude; wherein the current running power after the reduction is not less than the lower limit of the running power of the charging pile; in a case that the power of the grid PCC is 0, if the energy storage battery is in a charging state, the charging power of the energy storage battery is reduced, and the current running power is increased; wherein the current running power after the increase is not higher than the upper limit of the running power.

16. A control device characterized by comprising: The control device includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and the program or instructions are executed by the processor to implement the steps of the energy scheduling method according to any one of claims 1-8.

17. A readable storage medium, characterized by, The readable storage medium stores a program or instructions, and the program or instructions are executed by the processor to implement the steps of the energy scheduling method according to any one of claims 1-8.

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