Optical storage system coordination control method and device and electronic equipment

Abstract

The embodiment of the invention provides an optical storage system coordination control method and device and electronic equipment, the coordination control method is applied to a coordination control center, and an optical storage system comprises a photovoltaic unit, an energy storage unit and a grid-connected converter; the coordination control method comprises the following steps: acquiring working mode information reported by the photovoltaic unit and the energy storage unit, wherein the working mode comprises at least one of a normal working mode, a standby mode, an alarm processing mode and a fault processing mode; determining the total power supply capability of the photovoltaic unit and the energy storage unit according to the working mode; and according to the total power supply capability and the load state of the locomotive in the traction network, determining a power instruction issued to the photovoltaic unit, the energy storage unit and the grid-connected converter.

Description

Technical Field

[0001] This application relates to the field of AC electrified railway traction power supply technology, and in particular to a method, apparatus and electronic equipment for coordinated control of photovoltaic and energy storage systems for railway traction. Background Technology

[0002] Integrating photovoltaic and energy storage systems into the railway's AC25kV traction power supply system can optimize the energy balance of the traction network, reduce operating costs, and improve power quality.

[0003] In related technologies, a photovoltaic-storage system includes photovoltaic power generation units, energy storage units, and a grid-connected converter. Multiple photovoltaic power generation units are connected in parallel to a DC bus, and multiple energy storage units are also connected in parallel to a DC bus. The grid-connected converter provides a power flow path between the traction power supply and the DC bus.

[0004] In the aforementioned photovoltaic-storage system, how to reduce energy consumption in traction power supply is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a method, apparatus, and electronic device for coordinated control of a photovoltaic-storage system, which can reduce energy consumption in traction power supply.

[0006] To solve the above-mentioned technical problems, the embodiments of this application are implemented through the following aspects.

[0007] In a first aspect, embodiments of this application provide a coordinated control method for a photovoltaic-storage system, applied in a coordinated control center. The photovoltaic-storage system includes photovoltaic units, energy storage units, and grid-connected converters. The method includes: acquiring operating mode information reported by the photovoltaic units and the energy storage units, wherein the operating modes include at least one of a normal operating mode, a standby mode, an alarm handling mode, and a fault handling mode; determining the total power supply capacity of the photovoltaic units and the energy storage units based on the operating modes; and determining power commands to be issued to the photovoltaic units, the energy storage units, and the grid-connected converters based on the total power supply capacity and the load status of locomotives within the traction network.

[0008] Secondly, embodiments of this application provide a coordinated control method for a photovoltaic-storage system, applied to a controller of the photovoltaic-storage system, the photovoltaic-storage system including photovoltaic units, energy storage units, and grid-connected converters, the method including: determining the operating modes of the photovoltaic units and the energy storage units, the operating modes including at least one of normal operation mode, standby mode, alarm handling mode, and fault handling mode; reporting the operating mode information to the coordinated control center; receiving power commands issued by the coordinated control center, and setting the operating power of each photovoltaic unit, each energy storage unit, or each grid-connected converter according to the power commands; the power commands are determined by the coordinated control center based on the operating modes and the load status of locomotives in the traction network.

[0009] Thirdly, this application provides a photovoltaic-storage system coordination control device applied in a coordination control center. The photovoltaic-storage system includes photovoltaic units, energy storage units, and grid-connected converters. The coordination control device includes: an acquisition module for acquiring operating mode information reported by the photovoltaic units and the energy storage units, wherein the operating modes include at least one of normal operation mode, standby mode, alarm handling mode, and fault handling mode; a determination module for determining the total power supply capacity of the photovoltaic units and the energy storage units based on the operating modes; and a distribution module for determining the power commands to be distributed to the photovoltaic units, the energy storage units, and the grid-connected converters based on the total power supply capacity and the load status of locomotives in the traction network.

[0010] Fourthly, embodiments of this application provide an electronic device, including: a memory, a processor, and computer-executable instructions stored in the memory and executable on the processor, wherein the computer-executable instructions, when executed by the processor, implement the steps of the method described in the first aspect. Fifthly, embodiments of this application provide a computer-readable storage medium for storing computer-executable instructions that, when executed by a processor, implement the steps of the method described in the first aspect. In a sixth aspect, embodiments of this application provide a computer program product, wherein the computer-readable storage medium is used to store computer-executable instructions, which, when executed by a processor, implement the steps of the method described in the first aspect.

[0011] In this embodiment, the photovoltaic-storage system includes photovoltaic units, energy storage units, and grid-connected converters. The coordinated control method for this system can be applied to a coordinated control center. The method includes: acquiring operating mode information reported by the photovoltaic units and the energy storage units, where the operating modes include at least one of a normal operating mode, a standby mode, an alarm handling mode, and a fault handling mode; determining the total power supply capacity of the photovoltaic units and the energy storage units based on their operating modes; and determining the power commands to be issued to the photovoltaic units, the energy storage units, and the grid-connected converters based on the total power supply capacity and the load status of the locomotives in the traction network. Since the coordinated control center can acquire the operating mode information reported by each photovoltaic unit and each energy storage unit, it can determine the total power supply capacity of the photovoltaic units and the energy storage units based on this information. Based on the total power supply capacity and the load status of the locomotives in the traction network, it can determine the operating power of the photovoltaic units, the energy storage units, and the grid-connected converters, and then issue power commands to them. Therefore, this coordinated control method can combine the working modes of photovoltaic units and energy storage units to carry out overall control of the photovoltaic-energy storage system, thereby reducing energy consumption in traction power supply. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This illustration shows a flowchart of a coordinated control method for a photovoltaic energy storage system provided in an embodiment of this application. Figure 2 This illustration shows a schematic diagram of a photovoltaic energy storage system connected to a railway AC 25kV traction power supply system, according to an embodiment of this application. Figure 3A This illustration shows the mode classification diagram determined by the coordination and control center provided in the embodiments of this application for energy storage units and photovoltaic units in normal working mode; Figure 3B The coordination and control center provided in this application is a state transition diagram determined by the energy storage unit and photovoltaic unit in normal working mode; Figure 4 This illustration shows another flowchart of the coordinated control method for a photovoltaic energy storage system provided in an embodiment of this application; Figure 5 This illustration shows another flowchart of the coordinated control method for a photovoltaic energy storage system provided in an embodiment of this application; Figure 6 This illustrates the switchable radiation pattern of the optical energy storage system provided in this application embodiment between four modes; Figure 7 Show Figure 6 The switching process in standby mode; Figure 8 Show Figure 6 Switching process under normal working mode; Figure 9 Show Figure 6 Switching process under medium alarm handling mode; Figure 10 Show Figure 6 Switching process under fault handling mode; Figure 11 This illustration shows a structural schematic diagram of a photoelectric storage system coordination control device provided in an embodiment of this application; Figure 12 A schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0015] Figure 1 This diagram illustrates a flowchart of a coordinated control method for a photovoltaic storage system provided in an embodiment of this application. This method can be executed by a coordinated control center or by electronic devices, such as terminal devices or server devices. In other words, the method can be executed by software or hardware installed in the coordinated control center, terminal devices, or server devices. The server includes, but is not limited to, a single server, a server cluster, a cloud server, or a cloud server cluster. As shown in the diagram, the method may include the following steps.

[0016] Step S102: Obtain the operating mode information reported by the photovoltaic unit and the energy storage unit. The operating mode includes at least one of the following: normal operating mode, standby mode, alarm handling mode, and fault handling mode.

[0017] Step S104: Determine the total power supply capacity of the photovoltaic unit and the energy storage unit according to the operating mode.

[0018] Step S106: Based on the total power supply capacity and the load status of the locomotives in the traction network, determine the power command to be issued to the photovoltaic unit, the energy storage unit, and the grid-connected converter.

[0019] In this embodiment, the coordinated control method can combine the operating modes of photovoltaic units and energy storage units to perform overall control of the photovoltaic-energy storage system, reducing energy consumption in traction power supply. Specifically, the coordinated control method can acquire operating mode information reported by multiple photovoltaic units (or all photovoltaic units) and multiple energy storage units (or all energy storage units) within its control system, and determine the total power supply capacity of these photovoltaic units and energy storage units within the control system based on this operating mode information. Then, by combining the total power supply capacity with the load status of locomotives within the traction network, it determines the power commands to be issued to these photovoltaic units, energy storage units, and grid-connected connectors.

[0020] In one possible implementation, step S102 may be to periodically acquire the operating mode information reported by the photovoltaic unit and the energy storage unit; or it may be to acquire the operating mode information after other triggering conditions are met.

[0021] In one possible implementation, step S102 may further acquire operating mode information reported by the grid-connected converter. In another possible implementation, step S102 may further acquire operating mode information reported by at least one of the photovoltaic unit, energy storage unit, and grid-connected converter.

[0022] In one possible implementation, step S106 may involve issuing the power command to at least one of the photovoltaic unit, the energy storage unit, and the grid-connected converter.

[0023] In one embodiment, the photovoltaic unit may include a photovoltaic controller, capable of establishing a lower-level and upper-level relationship with the coordination control center; the energy storage unit may include an energy storage controller, capable of establishing a lower-level and upper-level relationship with the coordination control center; and the grid-connected converter may include a grid-connected controller, capable of establishing a lower-level and upper-level relationship with the coordination control center. In step S102, the photovoltaic controller and energy storage controller can report the operating mode information to the coordination control center. In step S106, the photovoltaic controller, energy storage controller, and grid-connected controller can receive and execute power commands issued by the coordination control center.

[0024] In one embodiment, since the energy storage unit includes a bidirectional DC-DC converter and multiple battery modules, the energy storage module may report the operating mode information of the bidirectional DC-DC converter and / or multiple battery modules within the energy storage unit in step S102. In another embodiment, since the photovoltaic unit includes a Boost converter and multiple photovoltaic arrays, the photovoltaic module may report the operating mode information of the Boost converter and / or multiple photovoltaic arrays within the photovoltaic unit in step S102.

[0025] In one possible implementation, the power commands issued in step S106 can all be the same, namely, a total power command. Each photovoltaic controller, energy storage controller, or grid-connected controller receiving the power command reads its own power command. The photovoltaic controller reads the power command belonging to the photovoltaic unit, the energy storage controller reads the power command belonging to the energy storage unit, and the grid-connected controller reads the power command belonging to the grid-connected converter. For example, the operating mode information reported in step S102 carries identifiers for each photovoltaic unit and each energy storage unit. Correspondingly, the power commands issued in step S106 can also carry these identifiers, allowing each photovoltaic unit and each energy storage unit to obtain the corresponding power command based on the identifier. The power command issued to the grid-connected converter can have a special identifier for easy differentiation and identification.

[0026] In one embodiment, the operating mode information carries identifiers for the photovoltaic unit and / or energy storage unit. Step S102 may include at least one of the following: Step A1: Upon receiving alarm processing mode information reported by the photovoltaic unit and / or the energy storage unit, display the alarm information and corresponding identifier on the coordination and control center.

[0027] Step A2: When the fault handling mode information reported by the photovoltaic unit and / or the energy storage unit is obtained, the fault information and the corresponding identifier are displayed on the coordination and control center.

[0028] Step A3: Upon receiving the normal operating mode information reported by the photovoltaic unit and / or the energy storage unit, display the alarm information and the corresponding identifier on the coordination and control center.

[0029] Step A4: Upon receiving the standby mode information reported by the photovoltaic unit and / or the energy storage unit, display the alarm information and the corresponding identifier on the coordination and control center.

[0030] Step A5: Upon receiving the operating mode information, control the photovoltaic unit and / or the energy storage unit that reported the fault mode information and / or alarm mode information to enter standby mode. Additionally, the photovoltaic unit and energy storage unit in standby mode can be controlled to enter normal operating mode.

[0031] Therefore, the coordination and control center can promptly obtain information on each photovoltaic unit and energy storage unit in alarm processing mode, fault processing mode, standby mode, and normal operation mode. Furthermore, the coordination and control center can quickly locate the photovoltaic unit and energy storage unit based on the identifier carried by the operation mode information.

[0032] In one implementation, the operating mode information carries identifiers for photovoltaic units and / or energy storage units. Correspondingly, in step S106, the issued power command may carry identifiers, and each identifier may have a mapping relationship with each power command. Thus, each photovoltaic unit, each energy storage unit, and each grid-connected converter in the photovoltaic-energy storage system can obtain the power command corresponding to its own identifier based on the identifier.

[0033] In one embodiment, the grid-connected converter may include a primary and a backup unit, wherein the backup unit may be in a hot standby mode. The grid-connected converter may be a single-phase grid-connected converter.

[0034] exist Figure 2 The diagram illustrates a photovoltaic (PV) and energy storage system connected to a railway AC 25kV traction power supply system. The PV unit comprises a PV array and a Boost converter, while the energy storage unit includes battery modules and a bidirectional DC-DC converter. Both the PV unit and the energy storage unit are connected to the DC bus. A single-phase grid-connected converter is connected between the DC bus and the traction network. In the case of multiple PV units, they are connected in parallel to the DC bus. Similarly, in the case of multiple energy storage units, they are connected in parallel to the DC bus, and the grid-connected converter is connected between the DC bus and the traction network.

[0035] In one implementation, the coordination control method further includes the following steps: Step B1: Based on the operating mode information reported by the photovoltaic units and the energy storage units, determine the proportion of the photovoltaic units and the energy storage units within the photovoltaic-energy storage system that are in fault handling mode and / or alarm handling mode. Specifically, determine the proportion of photovoltaic units in fault handling mode, the proportion of photovoltaic units in alarm handling mode, and the proportion of energy storage units in fault handling mode and alarm handling mode, and then calculate the average of these proportions.

[0036] Step B2: If the proportion is lower than the first threshold, issue a first alert. When the calculated average value is lower than the first threshold, the coordination control center issues a first alert, such as displaying the value of the average, the proportion of alarm handling mode, or the proportion of fault handling mode. The coordination center management personnel can then know the current proportion in alarm handling mode or fault handling mode and adjust the efficiency of alarm and fault resolution. For example, a higher proportion in alarm handling mode can improve alarm and fault resolution efficiency; conversely, a lower proportion can reduce it.

[0037] Step B3: If the ratio is not lower than the first threshold, issue a second alert message. When the ratio is not lower than the first threshold, the urgency and severity of the second alert message are greater than those of the first alert message. For example, an alarm may be issued at the coordination and control center, or a prompt may be made to cut off all energy storage units and photovoltaic units, and stop the power supply of the photovoltaic and energy storage system to the traction grid, so as to conduct a comprehensive inspection of the photovoltaic and energy storage system.

[0038] In one possible implementation, the coordination control center can determine the efficiency of alarm and fault elimination based on the ratio in step B2, and the ratio is positively correlated with the elimination efficiency, so as to reduce the probability of entering step B3, that is, reduce the probability of issuing the second prompt message.

[0039] In one embodiment, the load state of a locomotive within the traction network includes either traction or braking. In one embodiment, the coordination control method of this application is used for power supply coordination control of one locomotive within the traction network; however, it can also be used for power supply coordination control of more than one locomotive within the traction network.

[0040] In one implementation, step S106 may simply send power commands to photovoltaic units and energy storage units in normal operating mode, causing these energy storage units to enter standby mode, charging mode, or discharging mode, and causing these photovoltaic units to enter limited power point tracking (LPPT) mode or maximum power point tracking (MPPT) mode. Other photovoltaic units and energy storage units may not accept the power commands, or may ignore them after receiving them. Alternatively, step S106 may send power commands to photovoltaic units and energy storage units in normal operating mode or standby mode, and other photovoltaic units and energy storage units may not accept the power commands, or may ignore them after receiving them.

[0041] In one embodiment, a power command can also be issued to the parallel converter in normal operating mode so that the parallel converter can determine whether to invert the power of the photovoltaic-storage system and input it into the traction grid, or to rectify the power of the traction grid and input it into the photovoltaic-storage system.

[0042] In one embodiment, step S106 may include at least one of the following: Step C1: When the load state of the locomotive in the traction network is traction, if P in the optical storage system... PV ≤P Load SOC ≤ SOC min Then the power command is: P GCC = P PV , P Bat = 0, P PVC = P PV In this scenario, the energy storage unit can be in standby mode, and the photovoltaic unit can be in MPPT mode.

[0043] Step C2: When the load state of the locomotive in the traction network is traction, if P in the photovoltaic storage system... PV ≤P Load SOC>SOC min P PV ≤ (P Load - P dmax If the power command is P, then the power command is: P GCC = P PV + P dmax , P Bat = P dmax ,P PVC = P PV In this scenario, the energy storage unit can be in discharge mode, and the photovoltaic unit can be in MPPT mode.

[0044] Step C3: When the locomotive in the traction network is under traction load, if P in the photovoltaic storage system... PV ≤P Load SOC>SOC min P PV >(P Load - P dmax If the power command is P, then the power command is: P GCC = P Load , P Bat = P Load - P PV , P PVC = P PV In this scenario, the energy storage unit can be in discharge mode, and the photovoltaic unit can be in MPPT mode.

[0045] Step C4: When the locomotive in the traction network is under traction load, if P in the photovoltaic storage system... PV >P Load SOC ≤ SOC max P PV ≤ (P Load + P cmax If the power command is P, then the power command is: P GCC = P Load , P Bat = P Load -P PV ,P PVC = P PV In this scenario, the energy storage unit can be in charging mode, and the photovoltaic unit can be in MPPT mode.

[0046] Step C5: When the load state of the locomotive in the traction network is traction, if P in the optical storage system... PV >P Load SOC ≤ SOC max P PV >( P Load + P cmax If the power command is P, then the power command is: P GCC = P Load , P Bat = - P cmax ,P PVC = P Load + P cmax In this scenario, the energy storage unit can be in charging mode, and the photovoltaic unit can be in LPPT mode.

[0047] Step C6: When the load state of the locomotive in the traction network is traction, if P in the photovoltaic storage system... PV >P Load SOC>SOC max Then the power command is: P GCC = P Load , P Bat = 0, P PVC = P Load In this scenario, the energy storage unit can be in standby mode, and the photovoltaic unit can be in LPPT mode.

[0048] Step C7: When the locomotive in the traction network is under braking load, if P in the optical storage system... PV ≥P Load SOC ≤ SOC max P PV ≤ (P Load+ P cmax If the power command is P, then the power command is: P GCC = P Load , P Bat = P Load -P PV , P PVC = P PV In this scenario, the energy storage unit can be in charging mode, and the photovoltaic unit can be in MPPT mode.

[0049] Step C8: When the locomotive in the traction network is under braking load, if P in the optical storage system... PV ≥P Load SOC ≤ SOC max P PV >(P Load + P cmax If the power command is P, then the power command is: P GCC = P Load , P Bat = - P cmax ,P PVC = P Load + P cmax In this scenario, the energy storage unit can be in charging mode, and the photovoltaic unit can be in LPPT mode.

[0050] Step C9: When the locomotive in the traction network is under braking load, if P in the optical storage system... PV ≥P Load SOC>SOC max Then the power command is: P GCC = P Load , P Bat = 0, P PVC = P Load In this scenario, the energy storage unit can be in standby mode, and the photovoltaic unit can be in LPPT mode.

[0051] Among them, P PV P represents the rated output power of the photovoltaic unit in maximum power point tracking (MPPT) mode. Load P represents the traction load power. cmax P represents the maximum charging power (positive number) of the energy storage unit. dmax P represents the maximum discharge power (positive number) of the energy storage unit. GCC P represents the power command for a (single-phase) grid-connected converter (positive indicates rectification direction, negative indicates inverter direction). Bat P represents the power command for the energy storage unit (positive for discharging, negative for charging). PVCThe power command represents the photovoltaic unit, and SOC represents the state of charge (SOC) of the energy storage unit. min The State of Charge (SOC) represents the lowest state of charge of an energy storage unit. max This represents the highest state of charge of the energy storage unit.

[0052] in, Figure 3A The diagram shows the mode classification determined by the coordination and control center for energy storage units and photovoltaic units in normal operating mode.

[0053] The coordination and control center can also determine the state transition process for energy storage units and photovoltaic units that are in normal operating mode. Figure 3B This is a state transition diagram for energy storage units and photovoltaic units in normal operating mode.

[0054] In one possible implementation, in step S106, power commands may be issued only to photovoltaic units and energy storage units in normal working mode and standby mode, or power commands may be issued to photovoltaic units and energy storage units in all working modes (including alarm handling mode and fault handling mode).

[0055] Figure 4 This diagram illustrates a flowchart of a coordinated control method for a photovoltaic storage system provided in an embodiment of this application. This method can be executed by a coordinated control center or by electronic devices, such as terminal devices or server devices. In other words, the method can be executed by software or hardware installed in the coordinated control center, terminal devices, or server devices. The server includes, but is not limited to, a single server, a server cluster, a cloud server, or a cloud server cluster. As shown in the diagram, the method may include the following steps.

[0056] Step S402: Obtain the operating mode information reported by the photovoltaic unit and the energy storage unit, as well as the proportion of various operating modes in each photovoltaic unit and each energy storage unit. The operating modes include at least one of normal operating mode, standby mode, alarm handling mode and fault handling mode.

[0057] Step S404: Based on the operating mode information and the proportion of various operating modes, determine the power supply capacity of each photovoltaic unit and each energy storage unit, so as to determine the total power supply capacity of all photovoltaic units and all energy storage units; Step S406: Based on the total power supply capacity and the load status of the locomotives in the traction network, determine the power command to be issued to the photovoltaic unit, the energy storage unit, and the grid-connected converter.

[0058] In one possible implementation, as mentioned above, since the reported operating mode information includes the operating mode information of the Boost converter and / or multiple photovoltaic arrays within the photovoltaic unit, and the operating mode information of the bidirectional DC-DC converter and / or multiple battery modules within the energy storage unit, even within an energy storage unit, the operating mode information reported by its photovoltaic controller may include some battery modules in normal operating mode, some in standby mode, and some in alarm handling mode or fault handling mode. Similarly, different operating modes of each photovoltaic array can be reported within a single photovoltaic unit.

[0059] Therefore, steps S402 to S406 of this application can further reduce energy consumption.

[0060] Step S406 may include at least one of the following steps: Step D1: Based on the total power supply capacity and the load status of locomotives in the traction network, determine the total photovoltaic power of all available (available may include standby mode, normal operation mode, or alarm processing mode) photovoltaic units. Based on the total photovoltaic power, the operating mode information reported by the photovoltaic units, and the proportion of various operating modes of each photovoltaic unit, determine the power command to be issued to each photovoltaic unit. Step D2: Based on the total power supply capacity and the load status of locomotives in the traction network, determine the total energy storage power of all available energy storage units, and based on the total energy storage power, the working mode information reported by the energy storage units, and the proportion of various working modes of each energy storage unit, determine the power command to be issued to each energy storage unit. Step D3: Based on the total power supply capacity and the load status of locomotives within the traction network, determine the total grid-connected power of all available grid-connected converters, and determine the power command to be issued to the grid-connected converters.

[0061] Figure 5 This illustration shows a flowchart of a coordinated control method for a photovoltaic-energy storage system provided in an embodiment of this application. This method can be executed by the controllers of the photovoltaic-energy storage system or by electronic devices, such as terminal devices or server devices. The photovoltaic-energy storage system includes photovoltaic units, energy storage units, and a grid-connected converter. It includes the following steps.

[0062] Step S502: Determine the operating mode of the photovoltaic unit and the energy storage unit, wherein the operating mode includes at least one of the following: normal operating mode, standby mode, alarm handling mode, and fault handling mode; Step S504: Report the working mode information to the coordination and control center; Step S506: Receive the power command issued by the coordination and control center, and set the operating power of each photovoltaic unit, each energy storage unit or each grid-connected converter according to the power command; the power command is determined by the coordination and control center according to the operating mode and the load status of the locomotives in the traction network.

[0063] In one embodiment, the method further includes at least one of the following steps: Step E1: When the photovoltaic unit and / or the energy storage unit receive a control command from the coordination control center, the photovoltaic unit and / or the energy storage unit are determined to be in normal operating mode. This can be achieved by receiving the control command from the coordination control center in standby mode, and the control command may include, but is not limited to, power commands and start-up commands.

[0064] Step E2: If the photovoltaic unit and / or the energy storage unit generates an alarm signal, determine that the photovoltaic unit and / or the energy storage unit is in alarm processing mode. This can be because the alarm signal is generated in standby mode.

[0065] Step E3: In the event of a fault in the photovoltaic unit and / or the energy storage unit, determine that the photovoltaic unit and / or the energy storage unit is in a fault handling mode. This fault may occur in standby mode.

[0066] Step E4: If the photovoltaic unit and / or the energy storage unit eliminates the alarm signal and / or eliminates the fault, determine that the photovoltaic unit and / or the energy storage unit is in standby mode.

[0067] In one implementation, the photovoltaic-energy storage system (including photovoltaic units and energy storage units) can flexibly switch between standby mode, normal operation mode, alarm handling mode, and fault handling mode. For example, Figure 6 The switchable directions between the four modes are shown, where, Figure 7 The switching process in standby mode is shown. Figure 8 The switching process in normal working mode is shown. Figure 9 The switching process in alarm handling mode is shown. Figure 10 The switching process in fault handling mode is illustrated. Figures 7-10 The coordination controller in this context can refer to the aforementioned coordination control center.

[0068] Figure 11 The diagram shows a structural schematic of a photovoltaic-storage system coordination control device provided in an embodiment of this application. The photovoltaic-storage system includes a photovoltaic unit, an energy storage unit, and a grid-connected converter. The device 100 includes: an acquisition module 110, a determination module 120, and a distribution module 130.

[0069] The acquisition module 110 is used to acquire the operating mode information reported by the photovoltaic unit and the energy storage unit, wherein the operating mode includes at least one of the following: normal operating mode, standby mode, alarm handling mode and fault handling mode. The determining module 120 is used to determine the total power supply capacity of the photovoltaic unit and the energy storage unit according to the operating mode; The issuing module 130 is used to determine the power commands to be issued to the photovoltaic unit, the energy storage unit and the grid-connected converter based on the total power supply capacity and the load status of the locomotives in the traction network.

[0070] In one possible implementation, the device 100 is further configured to: Based on the operating mode information reported by the photovoltaic unit and the energy storage unit, determine the proportion of the photovoltaic unit and the energy storage unit in the photovoltaic-energy storage system that are in fault handling mode and / or alarm handling mode; If the ratio is lower than the first threshold, a first prompt message will be issued; If the ratio is not lower than the first threshold, a second prompt message is issued.

[0071] In one embodiment, the operating mode information carries an identifier for the photovoltaic unit or the energy storage unit; The acquisition of the operating mode information reported by the photovoltaic unit and the energy storage unit includes at least one of the following: When the alarm processing mode information reported by the photovoltaic unit and / or the energy storage unit is obtained, the alarm information and the corresponding identifier are displayed on the coordination and control center. When the fault handling mode information reported by the photovoltaic unit and / or the energy storage unit is obtained, the fault information and the corresponding identifier are displayed on the coordination and control center. When the normal operation mode information reported by the photovoltaic unit and / or the energy storage unit is obtained, alarm information and corresponding identifiers are displayed on the coordination and control center. When the standby mode information reported by the photovoltaic unit and / or the energy storage unit is obtained, the alarm information and the corresponding identifier are displayed on the coordination and control center. Upon obtaining the operating mode information, the photovoltaic unit and / or the energy storage unit that reported the fault mode information and / or alarm mode information shall enter the standby state.

[0072] In one possible implementation, determining the power command to be issued to the photovoltaic unit and the energy storage unit based on the total power supply capacity and the load status of locomotives within the traction network includes at least one of the following: When the locomotive in the traction network is under traction load, if P in the optical storage system...PV ≤ P Load SOC≤ SOC min Then the power command is: P GCC = P PV , P Bat = 0, P PVC = P PV ; When the locomotive in the traction network is under traction load, if P in the optical storage system... PV ≤ P Load SOC>SOC min P PV ≤( P Load - P dmax If the power command is P, then the power command is: P GCC = P PV + P dmax , P Bat = P dmax , P PVC = P PV ; When the locomotive in the traction network is under traction load, if P in the optical storage system... PV ≤ P Load SOC>SOC min P PV >( P Load - P dmax If the power command is P, then the power command is: P GCC = P Load , P Bat = P Load - P PV , P PVC = P PV ; When the locomotive in the traction network is under traction load, if P in the optical storage system... PV >P Load SOC≤ SOC max P PV ≤ (P) Load + P cmax If the power command is P, then the power command is: P GCC = P Load , P Bat = P Load -P PV ,P PVC = P PV ; When the locomotive in the traction network is under traction load, if P in the optical storage system... PV >P LoadSOC≤ SOC max P PV >( P Load + P cmax If the power command is P, then the power command is: P GCC = P Load , P Bat = - P cmax , P PVC = P Load +P cmax ; When the locomotive in the traction network is under traction load, if P in the optical storage system... PV >P Load SOC>SOC max Then the power command is: P GCC = P Load , P Bat = 0, P PVC = P Load ; When the locomotive in the traction network is under braking load, if P in the optical storage system... PV ≥ P Load SOC≤ SOC max P PV ≤ (P) Load + P cmax If the power command is P, then the power command is: P GCC = P Load , P Bat = P Load - P PV , P PVC =P PV ; When the locomotive in the traction network is under braking load, if P in the optical storage system... PV ≥ P Load SOC≤ SOC max P PV >(P Load + P cmax If the power command is P, then the power command is: P GCC = P Load , P Bat = - P cmax , P PVC = P Load +P cmax ; When the locomotive in the traction network is under braking load, if P in the optical storage system... PV ≥ P Load SOC>SOC maxThen the power command is: P GCC = P Load , P Bat = 0, P PVC = P Load ; Among them, P PV P represents the rated output power of the photovoltaic unit in maximum power point tracking (MPPT) mode. Load P represents the traction load power. cmax P represents the maximum charging power of the energy storage unit. dmax P represents the maximum discharge power of the energy storage unit. GCC P represents the power command of the grid-connected converter. Bat P represents the power command for the energy storage unit. PVC The SOC represents the power command of the photovoltaic unit and the state of charge of the energy storage unit. min The State of Charge (SOC) represents the lowest state of charge of an energy storage unit. max This represents the highest state of charge of the energy storage unit.

[0073] The device 100 provided in this application embodiment can execute the methods described in the preceding method embodiments and achieve the functions and beneficial effects of the methods described in the preceding method embodiments, which will not be repeated here.

[0074] This application embodiment also provides a photovoltaic-energy storage system coordination control device, which is applied to the controller of a photovoltaic-energy storage system. The photovoltaic-energy storage system includes photovoltaic units, energy storage units, and a grid-connected converter. The device can be used for: Determine the operating modes of the photovoltaic unit and the energy storage unit, wherein the operating modes include at least one of the following: normal operating mode, standby mode, alarm handling mode, and fault handling mode; Report the working mode information to the coordination and control center; The system receives power commands issued by the coordination and control center and sets the operating power of each photovoltaic unit, each energy storage unit, or each grid-connected converter according to the power commands. The power commands are determined by the coordination and control center based on the operating mode and the load status of locomotives in the traction network.

[0075] In one possible implementation, the device can also be used to indicate one of the following: When the photovoltaic unit and / or the energy storage unit receive a control command from the coordination and control center, the photovoltaic unit and / or the energy storage unit shall be determined to be in normal working mode. When the photovoltaic unit and / or the energy storage unit generate an alarm signal, the photovoltaic unit and / or the energy storage unit are determined to be in alarm processing mode; In the event of a failure in the photovoltaic unit and / or the energy storage unit, the photovoltaic unit and / or the energy storage unit shall be determined to be in a fault handling mode. If the photovoltaic unit and / or the energy storage unit eliminates alarm signals and / or eliminates faults, the photovoltaic unit and / or the energy storage unit shall be determined to be in standby mode.

[0076] In the embodiments of this application, "and / or" may include "and" or "or".

[0077] Figure 12 The diagram illustrates the hardware structure of an electronic device implementing the embodiments of this application. Referring to the diagram, at the hardware level, the electronic device includes a processor and optionally, an internal bus, a network interface, and a memory. The memory may include RAM, such as high-speed random-access memory (RAM), or non-volatile memory, such as at least one disk storage device. Of course, the electronic device may also include other hardware required for other services.

[0078] The processor, network interface, and memory can be interconnected via an internal bus, which can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. This bus can be categorized as an address bus, data bus, control bus, etc. For ease of illustration, only a single bidirectional arrow is used in this diagram, but this does not imply that there is only one bus or one type of bus.

[0079] Memory is used to store programs. Specifically, programs may include program code, which includes computer operation instructions. Memory may include main memory and non-volatile memory, and provides instructions and data to the processor.

[0080] The processor reads the corresponding computer program from non-volatile memory into main memory and then executes it, forming a device at the logical level that locates the target user. The processor executes the program stored in memory and specifically performs the following: Figure 1 , 4 The methods disclosed in the embodiments shown in Figure 5 achieve the functions and beneficial effects of the methods described in the preceding method embodiments, and will not be repeated here.

[0081] The above is as stated in this application. Figure 1 ,4 The method disclosed in the embodiment shown in Figure 5 can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software module can reside in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0082] The electronic device can also execute the methods described in the preceding method embodiments and achieve the functions and beneficial effects of the methods described in the preceding method embodiments, which will not be repeated here.

[0083] Of course, in addition to software implementation, the electronic device of this application does not exclude other implementation methods, such as logic devices or a combination of hardware and software, etc. In other words, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic devices.

[0084] This application also proposes a computer-readable storage medium that stores one or more programs, which, when executed by an electronic device including multiple applications, cause the electronic device to perform... Figure 1 , 4 The methods disclosed in the embodiments shown in Figure 5 achieve the functions and beneficial effects of the methods described in the preceding method embodiments, and will not be repeated here.

[0085] The computer-readable storage medium mentioned above includes read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc.

[0086] Furthermore, embodiments of this application also provide a computer program product, the computer program product including a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions, which, when executed by a computer, implement the following process: Figure 1 , 4 The methods disclosed in the embodiments shown in Figure 5 achieve the functions and beneficial effects of the methods described in the preceding method embodiments, and will not be repeated here.

[0087] In summary, the above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

[0088] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0089] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0090] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0091] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

Claims

1. A method for coordinated control of a photovoltaic-storage system, characterized in that, The system, applied in a coordination and control center, includes photovoltaic units, energy storage units, and a grid-connected converter; the method includes: Obtain the operating mode information reported by the photovoltaic unit and the energy storage unit, wherein the operating mode includes at least one of the following: normal operating mode, standby mode, alarm handling mode, and fault handling mode; Based on the operating mode, determine the total power supply capacity of the photovoltaic unit and the energy storage unit; Based on the total power supply capacity and the load status of locomotives within the traction network, the power commands issued to the photovoltaic unit, the energy storage unit, and the grid-connected converter are determined.

2. The control method according to claim 1, characterized in that, The method further includes: Based on the operating mode information reported by the photovoltaic unit and the energy storage unit, determine the proportion of the photovoltaic unit and the energy storage unit in the photovoltaic-energy storage system that are in fault handling mode and / or alarm handling mode; If the ratio is lower than the first threshold, a first prompt message will be issued; If the ratio is not lower than the first threshold, a second prompt message is issued.

3. The control method according to claim 1, characterized in that, The operating mode information carries the identifier of the photovoltaic unit or the energy storage unit; The acquisition of the operating mode information reported by the photovoltaic unit and the energy storage unit includes at least one of the following: When the alarm processing mode information reported by the photovoltaic unit and / or the energy storage unit is obtained, the alarm information and the corresponding identifier are displayed on the coordination and control center. When the fault handling mode information reported by the photovoltaic unit and / or the energy storage unit is obtained, the fault information and the corresponding identifier are displayed on the coordination and control center. When the normal operation mode information reported by the photovoltaic unit and / or the energy storage unit is obtained, alarm information and corresponding identifiers are displayed on the coordination and control center. When the standby mode information reported by the photovoltaic unit and / or the energy storage unit is obtained, the alarm information and the corresponding identifier are displayed on the coordination and control center. Upon obtaining the operating mode information, the photovoltaic unit and / or the energy storage unit that reported the fault mode information and / or alarm mode information shall enter the standby state.

4. The control method according to claim 1, characterized in that, The determination of power commands to be issued to the photovoltaic unit and the energy storage unit based on the total power supply capacity and the load status of locomotives in the traction network includes at least one of the following: When the locomotive in the traction network is under traction load, if P in the optical storage system... PV ≤ P Load SOC ≤ SOC min Then the power command is: P GCC = P PV , P Bat = 0, P PVC = P PV ; When the locomotive in the traction network is under traction load, if P in the optical storage system... PV ≤ P Load SOC > SOC min P PV ≤( P Load - P dmax If the power command is P, then the power command is: P GCC = P PV + P dmax , P Bat = P dmax , P PVC =P PV ; When the locomotive in the traction network is under traction load, if P in the optical storage system... PV ≤ P Load SOC > SOC min P PV >( P Load - P dmax If the power command is P, then the power command is: P GCC = P Load , P Bat = P Load - P PV , P PVC =P PV ; When the locomotive in the traction network is under traction load, if P in the optical storage system... PV > P Load SOC ≤ SOC max P PV ≤ (P) Load + P cmax If the power command is P, then the power command is: P GCC = P Load , P Bat = P Load -P PV ,P PVC =P PV ; When the locomotive in the traction network is under traction load, if P in the optical storage system... PV > P Load SOC ≤ SOC max P PV >( P Load + P cmax Then the power command is: P GCC = P Load , P Bat = - P cmax , P PVC = P Load + P cmax ; When the locomotive in the traction network is under traction load, if P in the optical storage system... PV > P Load SOC > SOC max Then the power command is: P GCC = P Load , P Bat = 0, P PVC = P Load ; When the locomotive in the traction network is under braking load, if P in the optical storage system... PV ≥ P Load SOC ≤ SOC max P PV ≤ (P) Load + P cmax If the power command is P, then the power command is: P GCC = P Load , P Bat = P Load - P PV , P PVC =P PV ; When the locomotive in the traction network is under braking load, if P in the optical storage system... PV ≥ P Load SOC ≤ SOC max P PV >(P Load + P cmax If the power command is P, then the power command is: P GCC = P Load , P Bat = - P cmax , P PVC = P Load + P cmax ; When the locomotive in the traction network is under braking load, if P in the optical storage system... PV ≥ P Load SOC > SOC max Then the power command is: P GCC = P Load , P Bat = 0, P PVC = P Load ; Among them, P PV P represents the rated output power of the photovoltaic unit in maximum power point tracking (MPPT) mode. Load P represents the traction load power. cmax P represents the maximum charging power of the energy storage unit. dmax P represents the maximum discharge power of the energy storage unit. GCC P represents the power command of the grid-connected converter. Bat P represents the power command for the energy storage unit. PVC The SOC represents the power command of the photovoltaic unit and the state of charge of the energy storage unit. min The State of Charge (SOC) represents the lowest state of charge of an energy storage unit. max This represents the highest state of charge of the energy storage unit.

5. A method for coordinated control of a photovoltaic-storage system, characterized in that, A controller applied to a photovoltaic-energy storage system, the photovoltaic-energy storage system including photovoltaic units, energy storage units, and a grid-connected converter, the method comprising: Determine the operating modes of the photovoltaic unit and the energy storage unit, wherein the operating modes include at least one of the following: normal operating mode, standby mode, alarm handling mode, and fault handling mode; Report the working mode information to the coordination and control center; The system receives power commands issued by the coordination and control center and sets the operating power of each photovoltaic unit, each energy storage unit, or each grid-connected converter according to the power commands. The power commands are determined by the coordination and control center based on the operating mode and the load status of locomotives in the traction network.

6. The control method according to claim 5, characterized in that, The method further includes at least one of the following: When the photovoltaic unit and / or the energy storage unit receive a control command from the coordination and control center, the photovoltaic unit and / or the energy storage unit shall be determined to be in normal working mode. When the photovoltaic unit and / or the energy storage unit generate an alarm signal, the photovoltaic unit and / or the energy storage unit are determined to be in alarm processing mode; In the event of a failure in the photovoltaic unit and / or the energy storage unit, the photovoltaic unit and / or the energy storage unit shall be determined to be in a fault handling mode. If the photovoltaic unit and / or the energy storage unit eliminates alarm signals and / or eliminates faults, the photovoltaic unit and / or the energy storage unit shall be determined to be in standby mode.

7. A coordinated control device for a photovoltaic-storage system, characterized in that, The photovoltaic-storage system, used in a coordination and control center, includes photovoltaic units, energy storage units, and a grid-connected converter. The coordination and control device includes: The acquisition module is used to acquire the operating mode information reported by the photovoltaic unit and the energy storage unit. The operating mode includes at least one of the following: normal operating mode, standby mode, alarm handling mode and fault handling mode. A determining module is used to determine the total power supply capacity of the photovoltaic unit and the energy storage unit based on the operating mode; The issuing module is used to determine the power commands to be issued to the photovoltaic unit, the energy storage unit, and the grid-connected converter based on the total power supply capacity and the load status of locomotives in the traction network.

8. An electronic device, characterized in that, include: processor; as well as A memory configured to store computer-executable instructions, which, when executed, use the processor to perform the steps of the coordinated control method according to any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable medium stores one or more programs that, when executed by an electronic device including multiple applications, cause the electronic device to perform the steps of the coordinated control method according to any one of claims 1-6.

10. A computer program product, characterized in that, The computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions that, when executed by a computer, implement the steps of the coordination control method according to any one of claims 1-6.

Images