Storage and charging all-in-one machine control method, storage and charging all-in-one machine and computer readable storage medium

Abstract

The invention provides a storage and charging all-in-one machine control method, a storage and charging all-in-one machine and a computer readable storage medium, the storage and charging all-in-one machine comprises at least one bidirectional ACDC and at least one energy storage battery, the energy storage battery is connected with the bidirectional ACDC through a direct current bus, the energy storage battery discharges to a direct current load through the direct current bus, and the energy storage battery is connected with the bidirectional ACDC through the direct current bus. The method comprises the following steps: acquiring voltage information of the energy storage battery in response to an instruction of discharging to the direct-current load; according to the voltage information of the energy storage battery, the DC side output voltage of the bidirectional ACDC is controlled, and the parallel voltage is matched with the output voltage of the energy storage battery; the parallel voltage represents the voltage after the bidirectional ACDC and the energy storage battery are connected in parallel, and the parallel voltage is used for inputting the direct current load. The method can reduce the cost of the storage and charging all-in-one machine and improve the discharge efficiency.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a storage-charging integrated machine control method, a storage-charging integrated machine, and a computer-readable storage medium. Background Art

[0002] In devices equipped with high-rate batteries, bidirectional DCDC (direct current to direct current converter) is often used to achieve functions such as power conversion and energy flow.

[0003] However, the cost of bidirectional DCDC is relatively high, and applying it to equipment will increase the cost of the equipment. In addition, the equipment needs to pass through bidirectional DCDC when discharging to the outside, which also leads to low discharge efficiency.

[0004] That is, in the related art, there are problems of high equipment cost and low discharge efficiency. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a storage-charging machine control method, a storage-charging machine and a computer-readable storage medium, so as to reduce the cost of the storage-charging machine and improve its discharge efficiency.

[0006] In the first aspect, an embodiment of the present application provides a control method for a storage-charging integrated machine, wherein the storage-charging integrated machine includes: at least one bidirectional ACDC (bidirectional AC-DC converter), at least one energy storage battery, the energy storage battery is connected to the bidirectional ACDC via a DC bus, and the energy storage battery discharges to a DC load via the DC bus, the method comprising: in response to an instruction to discharge to the DC load, obtaining voltage information of the energy storage battery; according to the voltage information of the energy storage battery, controlling the DC side output voltage and parallel voltage of the bidirectional ACDC to match the output voltage of the energy storage battery; the parallel voltage represents the voltage of the bidirectional ACDC and the energy storage battery after being connected in parallel, and the parallel voltage is used to input the DC load. In this way, the relevant components can be controlled by EMS to replace the function of the bidirectional DCDC in the storage-charging integrated machine and eliminate the conversion loss caused by the bidirectional DCDC. Therefore, the cost is reduced and the discharge efficiency is improved.

[0007] In some optional implementations, the step of obtaining the voltage information of the energy storage battery in response to the instruction to discharge to the DC load includes: determining whether the energy storage battery meets the discharge power requirement in response to the instruction to discharge to the DC load; if the energy storage battery meets the discharge power requirement, controlling the energy storage battery to discharge; if the energy storage battery does not meet the discharge power requirement, controlling the energy storage battery to continue discharging to the DC load, and controlling the bidirectional ACDC to convert external AC power into DC power and then discharge to the DC load; obtaining the voltage information of the energy storage battery during the discharge of the energy storage battery. In this way, it can be determined whether to increase the bidirectional ACDC coordinated discharge on the basis of the energy storage battery discharge by determining whether the energy storage battery meets the discharge power requirement. Thus, the energy storage battery can be fully utilized on the basis of meeting the power demand of the DC load, thereby improving the service capacity of the storage and charging integrated machine to a certain extent. Furthermore, when the bidirectional ACDC coordinated discharge is added, the DC side discharge power can be increased, which has the effect of expanding the capacity.

[0008] In some optional implementations, if the energy storage battery meets the discharge power requirement, the energy storage battery is controlled to discharge, including: if the energy storage battery meets the discharge power requirement, then judging whether the remaining power of the energy storage battery meets the power demand of the DC load; if the remaining power of the energy storage battery meets the power demand of the DC load, then controlling the energy storage battery to discharge; if the remaining power of the energy storage battery does not meet the power demand of the DC load, then controlling the energy storage battery to continue to discharge to the DC load, and controlling the bidirectional ACDC to convert the external AC power into DC power and then discharge to the DC load. In this way, it can be determined whether to increase the bidirectional ACDC coordinated discharge on the basis of the energy storage battery discharge by judging whether the remaining power of the energy storage battery meets the power demand of the DC load. Thus, the energy storage battery can be fully utilized on the basis of meeting the power demand of the DC load, and the service capacity of the storage and charging integrated machine is improved to a certain extent. Furthermore, when the bidirectional ACDC coordinated discharge is added, the DC side discharge power can be increased, which has a capacity expansion effect.

[0009] In some optional implementations, the method further includes: if the SOC of the energy storage battery is less than the SOC lower limit threshold, controlling the energy storage battery to stop discharging, and controlling the bidirectional ACDC to convert the external AC power into DC power and then discharge it to the DC load. In this way, the risk of potential safety hazards or damage to the energy storage battery can be reduced, and the power demand of the DC load can be met.

[0010] In some optional implementations, the AC side of the bidirectional ACDC is also provided with an AC bus, and the energy storage battery discharges to the AC load through the AC bus, and the method further includes: in response to an instruction to discharge to the AC load, controlling the energy storage battery to discharge to the AC load through the bidirectional ACDC. In this way, an AC bus is added to the existing DC bus in the storage-charging machine, so that the storage-charging machine can discharge not only to the DC load, but also to the AC load, thereby improving the application flexibility of the storage-charging machine.

[0011] In some optional implementations, in response to the instruction to discharge to the AC load, controlling the energy storage battery to discharge to the AC load through the bidirectional ACDC includes: in response to the instruction to discharge to the AC load, determining whether the AC load includes a power grid device; if the AC load includes a power grid device, then when the power grid device allows reverse power access to the Internet, controlling the energy storage battery to discharge to the power grid device through the bidirectional ACDC; if the AC load includes a power grid device, then when the power grid device does not allow reverse power access to the Internet, controlling the energy storage battery to discharge to other AC loads through the bidirectional ACDC. In this way, when the power grid device allows reverse power access to the Internet, the energy storage battery can be controlled to supply power to the power grid device, thereby balancing the power grid load. When the power grid device does not operate reverse power access to the Internet, the energy storage battery can be controlled to supply power to other AC loads to meet the power demand of the AC load, thereby giving full play to its discharge function.

[0012] In some optional implementations, when the grid equipment allows reverse power access to the grid, the energy storage battery is controlled to discharge to the grid equipment through the bidirectional ACDC, including: when the grid equipment allows reverse power access to the grid, if the required power of the grid equipment is greater than or equal to the discharge power of the energy storage battery, the energy storage battery is controlled to discharge to the grid equipment through the bidirectional ACDC; and if the required power of the grid equipment is less than the discharge power of the energy storage battery, the energy storage battery is controlled to discharge to the grid equipment and other AC loads through the bidirectional ACDC. In this way, it is possible to adaptively determine whether the energy storage battery discharges to other AC loads based on the required power of the grid equipment and the discharge power of the energy storage battery, so as to give priority to meeting the needs of the grid equipment, smooth the grid load, and meet the power demand of other AC loads to the greatest extent, thereby improving service capabilities.

[0013] In some optional implementations, the method further includes: in response to a charging instruction, controlling the bidirectional ACDC to receive external AC power to charge the energy storage battery. In this way, by controlling the bidirectional ACDC, the charging function of the energy storage battery can also be realized, so that the bidirectional DCDC can also be omitted, reducing costs and improving charging efficiency.

[0014] In the second aspect, the embodiment of the present application provides a control device for a storage-charging integrated machine, wherein the storage-charging integrated machine includes: at least one bidirectional ACDC, at least one energy storage battery, the energy storage battery is connected to the bidirectional ACDC via a DC bus, and the energy storage battery discharges to a DC load via the DC bus, and the device includes: an acquisition module for acquiring the voltage information of the energy storage battery in response to an instruction to discharge to the DC load; a DC control module for controlling the DC side output voltage and parallel voltage of the bidirectional ACDC to match the output voltage of the energy storage battery according to the voltage information of the energy storage battery; the parallel voltage represents the voltage of the bidirectional ACDC and the energy storage battery after being connected in parallel, and the parallel voltage is used to input the DC load. In this way, the relevant components can be controlled by EMS to replace the function of the bidirectional DCDC in the storage-charging integrated machine and eliminate the conversion loss caused by the bidirectional DCDC. Therefore, the cost is reduced and the discharge efficiency is improved.

[0015] In a third aspect, an embodiment of the present application provides a storage-charging integrated machine, comprising at least one bidirectional ACDC; at least one energy storage battery, wherein the energy storage battery is connected to the bidirectional ACDC via a DC bus, and the energy storage battery discharges to a DC load via the DC bus; and an energy manager, which is used for the steps in the method provided in the first aspect above.

[0016] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps in the method provided in the first aspect are performed.

[0017] In a fifth aspect, an embodiment of the present application provides a computer program product, which includes a computer program or instructions, and when the computer program or instructions are executed by a processor, the method described in the first aspect is performed.

[0018] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a storage-charging integrated machine provided in an embodiment of the present application;

[0021] Figure 2 A flow chart of a storage-charging integrated machine control method provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the interaction between an integrated storage and charging device and external devices provided in an embodiment of the present application;

[0023] Figure 4 A structural block diagram of a storage-charging machine control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0025] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] It should be noted that the embodiments in this application or the technical features in the embodiments may be combined if there is no conflict.

[0027] In the related art, there are problems of high equipment cost and low discharge efficiency; in order to solve this problem, the present application provides a storage-charge integrated machine control method, a storage-charge integrated machine and a computer-readable storage medium; further, by controlling the input voltage of the load to change with the voltage change of the energy storage battery in the storage-charge integrated machine, the function of the bidirectional DCDC in the related art is realized. Therefore, the bidirectional DCDC may not be installed in the storage-charge integrated machine provided by the present application, thereby reducing equipment cost and improving discharge efficiency.

[0028] The defects existing in the solutions in the above-mentioned related technologies are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above-mentioned problems and the solutions proposed in the embodiments of the present invention below for the above-mentioned problems should all be the contributions made by the inventor to the present invention during the process of the present invention.

[0029] For ease of understanding, this application first describes the structure of the storage and charging machine. Figure 1 , which shows a schematic diagram of a storage and charging integrated machine provided in an embodiment of the present application. Figure 1 As shown, the storage-charging integrated machine may include a bidirectional ACDC, an energy storage battery, and an energy manager EMS. The energy storage battery and the bidirectional ACDC are connected via a DC bus, and the energy storage battery can discharge to an external DC load via the DC bus. Furthermore, the EMS can be connected to the battery management system BMS of the energy storage battery and the bidirectional ACDC via the CAN bus to control both.

[0030] It should be noted that the integrated storage and charging machine may include one or more bidirectional ACDCs, and multiple bidirectional ACDCs may be connected in parallel; in addition, the integrated storage and charging machine may also include one or more energy storage batteries, and multiple energy storage batteries may be connected in series.

[0031] Furthermore, the integrated storage and charging machine may also include a high-voltage box, and the high-voltage box may be used as an electrical energy output port for the energy storage battery to uniformly charge or discharge the energy storage battery, so as to facilitate the management of the charging and discharging process.

[0032] Furthermore, the integrated storage and charging machine may also include multiple contactors, and the EMS may control the opening and closing of the contactors to control the on and off of the corresponding discharge circuit or charging circuit, thereby realizing the charging and discharging function of the energy storage battery. It should be noted that the above-mentioned contactor may specifically be a DC contactor.

[0033] In some application scenarios, the storage-charging machine control method can be implemented through the energy manager EMS of the storage-charging machine. In other application scenarios, the storage-charging machine control method can also be implemented through a cloud platform, which is not limited in this application. Further, the following text of this application is applied to EMS.

[0034] For details, please refer to Figure 2 , which shows a flow chart of a storage and charging integrated machine control method provided in an embodiment of the present application. Figure 2 As shown, the storage-charging integrated machine control method includes the following steps 201 to 202.

[0035] Step 201, in response to an instruction to discharge the DC load, obtaining voltage information of the energy storage battery;

[0036] The DC loads are devices or systems that can use DC power, and may include, for example, DC-DC charging systems, DC-DC charging piles, electric vehicles, and the like.

[0037] In some application scenarios, after the integrated storage and charging device is connected to the DC load through the DC bus, the DC load can, for example, send a discharge request instruction to the EMS through the CAN bus, and then the EMS can respond to the discharge instruction to the DC load and obtain the voltage information of the energy storage battery.

[0038] Step 202: Control the DC side output voltage and parallel voltage of the bidirectional ACDC to match the output voltage of the energy storage battery according to the voltage information of the energy storage battery; the parallel voltage represents the voltage of the bidirectional ACDC and the energy storage battery after being connected in parallel, and the parallel voltage is used to input the DC load.

[0039] Please continue reading Figure 1 The DC side output voltage of the bidirectional ACDC is also the output voltage of node A, the parallel voltage is also the output voltage of node B, and the output voltage of the energy storage battery can be, for example, the output voltage of the high-voltage box.

[0040] Thus, the EMS can control the matching of the three so that the energy storage battery and / or the bidirectional ACDC can discharge to the DC load. In some application scenarios, the EMS can receive the output voltage of the energy storage battery in real time, and then control the DC side output voltage of the bidirectional ACDC to be the same as the output voltage of the energy storage battery or to make the error between the two within a preset error; and control the parallel voltage to be the same as the output voltage of the energy storage battery or to make the difference between the two within a preset error range, thereby controlling the matching of the three.

[0041] Furthermore, after receiving the output voltage of the energy storage battery, the EMS can, for example, set the value of the DC side output voltage of the bidirectional ACDC and the value of the parallel voltage to the value of the output voltage of the energy storage battery or a value within a corresponding preset error range to implement the control process.

[0042] In these application scenarios, when the EMS receives the output voltage of the energy storage battery, it can set the values ​​of the other two within 100 milliseconds, for example. In this way, the other two can quickly follow the output voltage change of the energy storage battery, so that the three can keep matching.

[0043] It should be noted that during the discharge process of the energy storage battery, its voltage information may change continuously. Therefore, the DC side output voltage and parallel voltage of the bidirectional ACDC will also change continuously with the voltage information of the energy storage battery, and then the EMS can control the dynamic matching of the three.

[0044] Therefore, EMS can realize the functions of bidirectional DCDC such as power conversion and energy flow by controlling the DC side output voltage and parallel voltage of bidirectional ACDC to match the output voltage of energy storage battery. Then, in this implementation, EMS can be used to control related components to replace the function of bidirectional DCDC in the storage and charging machine, and eliminate the conversion loss caused by bidirectional DCDC. Therefore, the cost is reduced and the discharge efficiency is improved.

[0045] In some optional implementations, the step of obtaining the voltage information of the energy storage battery in response to the instruction to discharge the DC load in step 201 includes:

[0046] Sub-step 2011, in response to an instruction to discharge to the DC load, determining whether the energy storage battery meets the discharge power requirement;

[0047] The above discharge power requirement is the power requirement that the energy storage battery needs to meet when discharging externally. In some application scenarios, for example, the maximum discharge power and the minimum discharge power can be pre-set. At this time, the discharge power requirement can include that the discharge power of the energy storage battery is between the minimum discharge power and the maximum discharge power, so that the storage-charging device can discharge externally safely, stably and continuously.

[0048] Sub-step 2012, if the energy storage battery meets the discharge power requirement, controlling the energy storage battery to discharge;

[0049] It should be noted that, since the energy storage battery meets the discharge power requirement, only the energy storage battery may be controlled to discharge.

[0050] Sub-step 2013, if the energy storage battery does not meet the discharge power requirement, controlling the energy storage battery to continue discharging to the DC load, and controlling the bidirectional ACDC to convert external AC power into DC power and then discharge to the DC load;

[0051] That is to say, when the energy storage battery does not meet the discharge power requirement, bidirectional ACDC coordinated discharge can be introduced on the basis of controlling the discharge of the energy storage battery to meet the power demand of the DC load. In some application scenarios, the external AC power can be, for example, the mains power from the power grid.

[0052] Sub-step 2014, during the discharge process of the energy storage battery, obtaining voltage information of the energy storage battery.

[0053] It should be noted that during the discharge process of the energy storage battery, the BMS can monitor in real time whether there is any abnormality in the state of the battery cell or battery pack of the energy storage battery. If there is any abnormality, the BMS can send an abnormal signal to the EMS, and then the EMS can make relevant instructions based on the abnormal signal to reduce the risk of damage to the energy storage battery. For example, the EMS can instruct the BMS to limit the output power or suspend discharge, etc. The above abnormal signals may include, for example, abnormal signals of the voltage, current, temperature, SOC, SOH, etc. of the battery cell or battery pack.

[0054] In this implementation, it is possible to determine whether to add bidirectional ACDC coordinated discharge on the basis of energy storage battery discharge by judging whether the energy storage battery meets the discharge power requirement. Thus, the energy storage battery can be fully utilized on the basis of meeting the power demand of the DC load, and the service capacity of the storage and charging integrated machine is improved to a certain extent. Furthermore, when the bidirectional ACDC coordinated discharge is added, the DC side discharge power can be increased, which has the effect of expanding the capacity.

[0055] In some optional implementations, if the energy storage battery meets the discharge power requirement in the above sub-step 2012, controlling the energy storage battery to discharge includes:

[0056] Sub-step 1: if the energy storage battery meets the discharge power requirement, determining whether the remaining power of the energy storage battery meets the power requirement of the DC load;

[0057] Sub-step 2: if the remaining power of the energy storage battery meets the power demand of the DC load, controlling the energy storage battery to discharge;

[0058] It should be noted that, since the remaining power of the energy storage battery meets the power demand of the DC load, only the discharge of the energy storage battery can be controlled.

[0059] Sub-step three: if the remaining power of the energy storage battery does not meet the power demand of the DC load, control the energy storage battery to continue discharging to the DC load, and control the bidirectional ACDC to convert external AC power into DC power and then discharge to the DC load.

[0060] That is to say, since the remaining power of the energy storage battery cannot meet the power demand of the DC load, bidirectional ACDC coordinated discharge can be introduced on the basis of controlling the discharge of the energy storage battery to enable the DC load to meet its power demand.

[0061] In this implementation, it is possible to determine whether to add bidirectional ACDC coordinated discharge on the basis of energy storage battery discharge by judging whether the remaining power of the energy storage battery meets the power demand of the DC load. Thus, the energy storage battery can be fully utilized on the basis of meeting the power demand of the DC load, and the service capacity of the storage and charging integrated machine is improved to a certain extent. Furthermore, when the bidirectional ACDC coordinated discharge is added, the discharge power on the DC side can be increased, which has the effect of expanding the capacity.

[0062] In some optional implementations, the method further includes step 203: if the SOC of the energy storage battery is less than the SOC lower limit threshold, controlling the energy storage battery to stop discharging, and controlling the bidirectional ACDC to convert external AC power into DC power and then discharge to the DC load.

[0063] The above-mentioned SOC lower limit threshold value may be set by an operator based on experience, or may be determined based on the discharge depth of the energy storage battery, and this application does not impose any limitation on this.

[0064] Furthermore, during the discharge process of the energy storage battery, if its SOC is less than the SOC lower limit threshold, the energy storage battery can be controlled to stop discharging to reduce the risk of safety hazards or damage to the energy storage battery.

[0065] Furthermore, when the energy storage battery stops discharging, the EMS can control the bidirectional ACDC to discharge to the DC load to meet the power demand of the DC load.

[0066] In some optional implementations, an AC bus is also provided on the AC side of the bidirectional ACDC, and the energy storage battery discharges to the AC load through the AC bus. The method also includes step 204: in response to an instruction to discharge to the AC load, controlling the energy storage battery to discharge to the AC load through the bidirectional ACDC.

[0067] Please continue reading Figure 1 The AC side of the bidirectional ACDC is also the side where node C is located.

[0068] The AC loads mentioned above, i.e., devices or systems that can use AC power, may include, for example, ACDC charging systems, household appliances, power grid equipment, etc.

[0069] In some application scenarios, after the integrated storage and charging device is connected to the AC load through the AC bus, the AC load can send a discharge request instruction to the EMS through the CAN bus, and then the EMS can respond to the instruction to discharge the AC load and then control the energy storage battery to discharge. Furthermore, the energy storage battery can output DC power, which is converted into AC power by the bidirectional ACDC and then transmitted to the AC load.

[0070] In this implementation, an AC bus is added to the existing DC bus in the storage-charging machine, so that the storage-charging machine can discharge not only to the DC load but also to the AC load, thereby improving the application flexibility of the storage-charging machine.

[0071] In some application scenarios, the grid can supply power to the integrated storage and charging device, and the integrated storage and charging device can also supply power to the grid. Therefore, in some optional implementations, in response to the instruction to discharge to the AC load described in step 204, controlling the energy storage battery to discharge to the AC load through the bidirectional ACDC includes:

[0072] Sub-step 2041, in response to an instruction to discharge the AC load, determining whether the AC load includes a grid device;

[0073] In some application scenarios, the EMS may, for example, pre-set an identifier of the power grid device, so that if it is detected that the identifier of the power grid device exists in the instruction, it can be determined that the current AC load is the power grid device.

[0074] Sub-step 2042, if the AC load includes a power grid device, then when the power grid device allows reverse power access to the grid, controlling the energy storage battery to discharge to the power grid device through the bidirectional ACDC;

[0075] The above-mentioned reverse power access to the grid means reverse power supply to the grid equipment. Then, if the grid equipment allows the storage and charging integrated machine to reverse power it, the EMS can control the energy storage battery to output DC power, which is then converted into AC power through the bidirectional ACDC and transmitted to the grid equipment.

[0076] Sub-step 2043, if the AC load includes a power grid device, then when the power grid device does not allow reverse power access to the grid, control the energy storage battery to discharge to other AC loads through the bidirectional ACDC.

[0077] That is, when the grid equipment does not allow the storage and charging machine to reversely supply power to it, the EMS can control the energy storage battery to discharge to other AC loads, thereby meeting the power demand of other AC loads.

[0078] It should be noted that if the AC load does not include grid equipment, the energy storage battery can be controlled to discharge to the relevant AC load.

[0079] In this implementation, when the grid equipment allows reverse power access, the energy storage battery can be controlled to supply power to the grid equipment, thereby balancing the grid load. When the grid equipment does not allow reverse power access, the energy storage battery can be controlled to supply power to other AC loads to meet the power demand of the AC loads, thereby giving full play to its discharge function.

[0080] In some optional implementations, when the grid device described in the above sub-step 2042 allows reverse power access to the grid, controlling the energy storage battery to discharge to the grid device through the bidirectional ACDC includes:

[0081] First, when the grid equipment allows reverse power access to the grid, if the required power of the grid equipment is greater than or equal to the discharge power of the energy storage battery, the energy storage battery is controlled to discharge to the grid equipment through the bidirectional ACDC;

[0082] Then, if the required power of the grid equipment is less than the discharge power of the energy storage battery, the energy storage battery is controlled to discharge to the grid equipment and other AC loads through the bidirectional ACDC.

[0083] That is to say, when the power required by the grid equipment is greater than or equal to the discharge power of the energy storage battery, the EMS can control the energy storage battery to disconnect the discharge path to other AC loads, so as to control the energy storage battery to discharge to the grid equipment first. When the power required by the grid equipment is less than the discharge power of the energy storage battery, the EMS can control the energy storage battery to close the discharge path to other AC loads, so as to control the energy storage battery to discharge to the grid equipment and other AC loads respectively.

[0084] In this implementation, it is possible to adaptively determine whether the energy storage battery discharges to other AC loads based on the power required by the grid equipment and the discharge power of the energy storage battery, thereby giving priority to meeting the needs of the grid equipment, smoothing the grid load, and meeting the power demands of other AC loads to the greatest extent, thereby improving service capabilities.

[0085] In some optional implementations, the method further includes: in response to a charging instruction, controlling the bidirectional ACDC to receive external alternating current to charge the energy storage battery.

[0086] In some application scenarios, the above charging instructions may be issued by, for example, a BMS. For example, when the BMS detects that the SOC of the energy storage battery is lower than the SOC lower limit threshold, it may send a charging instruction to the EMS. In other application scenarios, the above charging instructions may also be detected autonomously by, for example, the EMS. For example, an operator may connect the storage-charging integrated device to the charging device, so that when the EMS detects that the connection between the two is normal, it may be regarded as sending a charging instruction.

[0087] In some application scenarios, the bidirectional ACDC can, for example, receive alternating current from grid equipment, convert it into direct current, and transmit it to the energy storage battery so that the energy storage battery can store electricity.

[0088] It should be noted that during the charging process of the energy storage battery, the BMS can monitor in real time whether there is any abnormality in the state of the battery cell or battery pack of the energy storage battery. If there is any abnormality, the BMS can send an abnormal signal to the EMS, and then the EMS can make relevant instructions based on the abnormal signal to reduce the risk of damage to the energy storage battery. For example, the EMS can instruct the BMS to limit the output power or suspend charging. The above abnormal signals may include, for example, abnormal signals of the voltage, current, temperature, SOC, SOH, etc. of the battery cell or battery pack.

[0089] Furthermore, the EMS may stop charging the energy storage battery when it detects that the SOC of the energy storage battery reaches a set value or an SOC upper limit threshold.

[0090] In this implementation, by controlling the bidirectional ACDC, the charging function of the energy storage battery can also be realized, so that the bidirectional DCDC can also be omitted, reducing costs and improving charging efficiency.

[0091] To further explain the technical solution of this application, please refer to Figure 3 , which shows a schematic diagram of the interaction between a storage and charging integrated machine and external devices provided by an embodiment of the present application. Figure 3 As shown, the DCDC charging system is a DC load, and its charging power controller PCU can send instructions to the EMS to discharge the DCDC charging system, and its DCDC module can receive the electric energy released by the storage-charging machine. The ACDC charging system and power grid equipment are AC loads, and the charging power controller PCU of the ACDC charging system can send instructions to the EMS to discharge them, and its ACDC module can receive the electric energy released by the storage-charging machine. In addition, the electric power controller PCU can be connected to the EMS through the CAN bus. Furthermore, the EMS can be connected to the cloud platform through wired (such as Ethernet) or wireless communication, so as to realize information interaction between the cloud platform and the EMS, thereby realizing the control of the storage-charging machine by the cloud platform.

[0092] Furthermore, the storage-charging integrated machine may include three contactors, wherein the DC side output terminal of the bidirectional ACDC (such as node A in the figure), contactor 2, the output terminal of the energy storage battery (if there is a high-voltage box, it is a high-voltage box), and contactor 3 may be connected in sequence and then connected in parallel with contactor 1. Then, the energy storage battery and / or the bidirectional ACDC may discharge to the DCDC charging system through node B.

[0093] Furthermore, the storage and charging integrated machine may also include a smart meter, which may be located on the path between the AC side output end of the bidirectional ACDC and the grid equipment, and is used to control the on and off of the AC bus between the bidirectional ACDC and the grid equipment. In addition, the smart meter may be connected to the EMS communication via the RS485 electrical standard or Ethernet.

[0094] Then, when the integrated storage and charging device supplies power to the DCDC charging system through the DC bus, the EMS can respond to the instruction to discharge to the DCDC charging system and determine whether the energy storage battery meets the discharge power requirement.

[0095] If the energy storage battery meets the discharge power requirement, the EMS can control contactor 3 to close, and contactor 1 and contactor 2 to disconnect, so that the energy storage battery discharges to the DCDC module. Furthermore, the EMS continues to determine whether the remaining power of the energy storage battery meets the power demand of the DC load. If the remaining power of the energy storage battery meets the power demand of the DC load, the energy storage battery continues to be controlled to continue to discharge; if the remaining power of the energy storage battery does not meet the power demand of the DC load, contactor 1 is closed again to control the energy storage battery to continue to discharge to the DC load, and the bidirectional ACDC is controlled to convert the external AC power into DC power and then discharge to the DC load.

[0096] If the energy storage battery does not meet the discharge power requirement, contactor 1 and contactor 3 are controlled to close and contactor 2 is disconnected to control the energy storage battery to continue discharging to the DC load, and to control the bidirectional ACDC to convert the external AC power into DC power and then discharge to the DC load.

[0097] Furthermore, during the discharge process of the energy storage battery, voltage information of the energy storage battery is obtained.

[0098] Then, according to the voltage information of the energy storage battery, the voltage of node A and the voltage of node B can be controlled to match the output voltage of the energy storage battery.

[0099] Furthermore, when the SOC of the energy storage battery is less than the SOC lower limit threshold, contactor 2 and contactor 3 are disconnected, and contactor 1 is closed to disconnect the discharge path of the energy storage battery and enable the bidirectional ACDC to discharge to the DCDC charging system.

[0100] Furthermore, when the storage-charging integrated machine supplies power to the ACDC charging system through the AC bus, if the grid equipment allows reverse power access to the grid, when the required power of the grid equipment is greater than or equal to the discharge power of the energy storage battery, the EMS can send information to the PCU of the ACDC charging system not to supply power to it, so that the PCU controls the ACDC charging system to stop working when necessary. Then, the EMS can control contactor 1 and contactor 3 to disconnect, control contactor 2 to close, and control the smart meter to close the path where the grid equipment is located, so as to control the energy storage battery to discharge to the grid equipment through the bidirectional ACDC. When the required power of the grid equipment is less than the discharge power of the energy storage battery, information to supply power to the PCU of the ACDC charging system can be sent to it, so that the PCU controls the ACDC charging system to prepare for charging. Then, the EMS can control contactor 2 to close, contactor 1 and contactor 3 to disconnect, and control the smart meter to close the path where the grid equipment is located, so as to control the energy storage battery to discharge to the grid equipment and the ACDC charging system through the bidirectional ACDC.

[0101] Furthermore, if the grid equipment does not allow reverse power access to the grid, the EMS can control the smart meter to disconnect the path where the grid equipment is located to control the energy storage battery to discharge to the ACDC charging system through the bidirectional ACDC.

[0102] In addition, when the grid equipment charges the energy storage battery through the AC bus, the EMS can close contactor 2 and disconnect contactor 1 and contactor 3, thereby conducting the charging path between the grid equipment and the energy storage battery.

[0103] Those skilled in the art will appreciate that, in the above method of a specific embodiment, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0104] Please refer to Figure 4 , which shows a structural block diagram of a storage-charging machine control device provided in an embodiment of the present application. The storage-charging machine control device can be a module, program segment or code on the storage-charging machine. It should be understood that the device is similar to the above-mentioned Figure 2 The method embodiment corresponds to and can be executed Figure 2 The method embodiment involves various steps.

[0105] Optionally, the integrated storage and charging device includes: at least one bidirectional ACDC and at least one energy storage battery, the energy storage battery and the bidirectional ACDC are connected through a DC bus, and the energy storage battery discharges to a DC load through the DC bus. The device includes: an acquisition module 401, which is used to obtain voltage information of the energy storage battery in response to an instruction to discharge to the DC load; a DC control module 402, which is used to control the DC side output voltage and parallel voltage of the bidirectional ACDC to match the output voltage of the energy storage battery according to the voltage information of the energy storage battery; the parallel voltage represents the voltage after the bidirectional ACDC and the energy storage battery are connected in parallel, and the parallel voltage is used to input the DC load.

[0106] In some optional implementations, the acquisition module 401 is further used to: in response to an instruction to discharge to the DC load, determine whether the energy storage battery meets the discharge power requirement; if the energy storage battery meets the discharge power requirement, control the energy storage battery to discharge; if the energy storage battery does not meet the discharge power requirement, control the energy storage battery to continue discharging to the DC load, and control the bidirectional ACDC to convert external AC power into DC power and then discharge to the DC load; during the discharge process of the energy storage battery, obtain the voltage information of the energy storage battery.

[0107] In some optional implementations, the acquisition module 401 is further used to: if the energy storage battery meets the discharge power requirement, determine whether the remaining power of the energy storage battery meets the power demand of the DC load; if the remaining power of the energy storage battery meets the power demand of the DC load, control the energy storage battery to discharge; if the remaining power of the energy storage battery does not meet the power demand of the DC load, control the energy storage battery to continue discharging to the DC load, and control the bidirectional ACDC to convert external AC power into DC power and then discharge to the DC load.

[0108] In some optional implementations, the device also includes a SOC control module, which is used to: if the SOC of the energy storage battery is less than the SOC lower limit threshold, control the energy storage battery to stop discharging, and control the bidirectional ACDC to convert external AC power into DC power and then discharge it to the DC load.

[0109] In some optional implementations, the AC side of the bidirectional ACDC is also provided with an AC bus, and the energy storage battery discharges to the AC load through the AC bus. The device also includes an AC control module, and the AC control module is used to: in response to an instruction to discharge to the AC load, control the energy storage battery to discharge to the AC load through the bidirectional ACDC.

[0110] In some optional implementations, the AC control module is further used to: in response to an instruction to discharge to the AC load, determine whether the AC load includes a grid device; if the AC load includes a grid device, then when the grid device allows reverse power access to the grid, control the energy storage battery to discharge to the grid device through the bidirectional ACDC; if the AC load includes a grid device, then when the grid device does not allow reverse power access to the grid, control the energy storage battery to discharge to other AC loads through the bidirectional ACDC.

[0111] In some optional implementations, the AC control module is further used for: when the grid device allows reverse power access to the grid, if the required power of the grid device is greater than or equal to the discharge power of the energy storage battery, then controlling the energy storage battery to discharge to the grid device through the bidirectional ACDC; and, if the required power of the grid device is less than the discharge power of the energy storage battery, then controlling the energy storage battery to discharge to the grid device and other AC loads through the bidirectional ACDC.

[0112] In some optional implementations, the device further includes a charging module, which is used to: in response to a charging instruction, control the bidirectional ACDC to receive external alternating current to charge the energy storage battery.

[0113] It should be noted that those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0114] The present application embodiment provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the following can be performed: Figure 1 Any implementation method in the method embodiment shown.

[0115] An embodiment of the present application provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments. For example, the method may include: in response to an instruction to discharge the DC load, obtaining voltage information of the energy storage battery; according to the voltage information of the energy storage battery, controlling the DC side output voltage and parallel voltage of the bidirectional ACDC to match the output voltage of the energy storage battery; the parallel voltage represents the voltage after the bidirectional ACDC and the energy storage battery are connected in parallel, and the parallel voltage is used to input the DC load.

[0116] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0117] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0118] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0119] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0120] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for a storage and charging machine, characterized in that: The storage-charging integrated machine comprises: at least one bidirectional ACDC and at least one energy storage battery, the energy storage battery and the bidirectional ACDC are connected via a DC bus, and the energy storage battery discharges to a DC load via the DC bus. The method comprises: In response to an instruction to discharge the DC load, acquiring voltage information of the energy storage battery; According to the voltage information of the energy storage battery, the DC side output voltage and the parallel voltage of the bidirectional ACDC are controlled to match the output voltage of the energy storage battery; the parallel voltage represents the voltage after the bidirectional ACDC and the energy storage battery are connected in parallel, and the parallel voltage is used to input the DC load.

2. The method according to claim 1, characterized in that The step of obtaining voltage information of the energy storage battery in response to the instruction to discharge the DC load comprises: In response to an instruction to discharge the DC load, determining whether the energy storage battery meets a discharge power requirement; If the energy storage battery meets the discharge power requirement, controlling the energy storage battery to discharge; If the energy storage battery does not meet the discharge power requirement, the energy storage battery is controlled to continue discharging to the DC load, and the bidirectional ACDC is controlled to convert the external AC power into DC power and then discharge to the DC load; During the discharge process of the energy storage battery, voltage information of the energy storage battery is obtained.

3. The method according to claim 2, characterized in that If the energy storage battery meets the discharge power requirement, controlling the energy storage battery to discharge includes: If the energy storage battery meets the discharge power requirement, determining whether the remaining power of the energy storage battery meets the power requirement of the DC load; If the remaining power of the energy storage battery meets the power demand of the DC load, controlling the energy storage battery to discharge; If the remaining power of the energy storage battery does not meet the power demand of the DC load, the energy storage battery is controlled to continue discharging to the DC load, and the bidirectional ACDC is controlled to convert the external AC power into DC power and then discharge to the DC load.

4. The method according to any one of claims 2 to 3, characterized in that: The method further comprises: If the SOC of the energy storage battery is less than the SOC lower limit threshold, the energy storage battery is controlled to stop discharging, and the bidirectional ACDC is controlled to convert the external AC power into DC power and then discharge it to the DC load.

5. The method according to claim 1, characterized in that The AC side of the bidirectional ACDC is also provided with an AC bus, and the energy storage battery discharges to the AC load through the AC bus. The method further includes: In response to an instruction to discharge to the AC load, the energy storage battery is controlled to discharge to the AC load through the bidirectional ACDC.

6. The method according to claim 5, characterized in that In response to the instruction to discharge to the AC load, controlling the energy storage battery to discharge to the AC load through the bidirectional ACDC comprises: In response to an instruction to discharge the AC load, determining whether the AC load includes a grid device; If the AC load includes a power grid device, then when the power grid device allows reverse power access to the grid, control the energy storage battery to discharge to the power grid device through the bidirectional ACDC; If the AC load includes a power grid device, then when the power grid device does not allow reverse power access to the grid, the energy storage battery is controlled to discharge to other AC loads through the bidirectional ACDC.

7. The method according to claim 6, characterized in that When the grid device allows reverse power access to the grid, controlling the energy storage battery to discharge to the grid device through the bidirectional ACDC includes: In the case where the grid device allows reverse power access to the grid, if the required power of the grid device is greater than or equal to the discharge power of the energy storage battery, control the energy storage battery to discharge to the grid device through the bidirectional ACDC; and If the required power of the grid equipment is less than the discharge power of the energy storage battery, the energy storage battery is controlled to discharge to the grid equipment and other AC loads through the bidirectional ACDC.

8. The method according to claim 1, characterized in that: The method further comprises: In response to a charging instruction, the bidirectional ACDC is controlled to receive external alternating current to charge the energy storage battery.

9. A control device for a storage and charging machine, characterized in that: The storage-charging integrated device comprises: at least one bidirectional ACDC and at least one energy storage battery, wherein the energy storage battery is connected to the bidirectional ACDC via a DC bus, and the energy storage battery discharges to a DC load via the DC bus. The device comprises: an acquisition module, configured to acquire voltage information of the energy storage battery in response to an instruction to discharge the DC load; A DC control module is used to control the DC side output voltage and parallel voltage of the bidirectional ACDC to match the output voltage of the energy storage battery according to the voltage information of the energy storage battery; the parallel voltage represents the voltage after the bidirectional ACDC and the energy storage battery are connected in parallel, and the parallel voltage is used to input the DC load.

10. A storage and charging machine, characterized in that: include: At least one bidirectional ACDC; At least one energy storage battery, wherein the energy storage battery is connected to the bidirectional ACDC via a DC bus, and the energy storage battery discharges to a DC load via the DC bus; An energy manager, configured to execute the method according to any one of claims 1 to 8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 8 is executed.

12. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the method according to any one of claims 1 to 8 is performed.

Images