CN117895540A - Control method of energy storage system and energy storage system - Google Patents
Control method of energy storage system and energy storage system Download PDFInfo
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Abstract
The application is suitable for the technical field of energy storage, and provides a control method of an energy storage system and the energy storage system. The energy storage system comprises power conversion equipment, wherein the power conversion equipment is used for being connected with photovoltaic power generation equipment, the power conversion equipment comprises a switching circuit, the power conversion equipment is further used for being connected with a load and a power grid through the switching circuit, the power conversion equipment is used for realizing energy transmission among the photovoltaic power generation equipment, the load and the power grid, and the control method comprises the following steps: acquiring the demand information of a load; acquiring power generation information of the photovoltaic power generation equipment, wherein the power generation information comprises at least one of photovoltaic power generation power and photovoltaic power generation voltage of the photovoltaic power generation equipment; and controlling the conduction path of the switching circuit according to the demand information and the power generation information, and controlling the power conversion equipment to enter a corresponding working mode, wherein the working mode at least comprises a standby mode. The embodiment of the application can improve the operation reliability of the energy storage system.
Description
Technical Field
The application belongs to the technical field of energy storage, and particularly relates to a control method of an energy storage system and the energy storage system.
Background
In some new energy systems, a power conversion device (Power Convert System, PCS), an energy storage device, and a photovoltaic power generation device (PV) are connected to form a photovoltaic energy storage system. The photovoltaic power generation device can convert sunlight radiation energy into electric energy by utilizing the photovoltaic effect of the solar cell semiconductor material, and store the electric energy in the energy storage device or output the electric energy through the energy storage device.
In some use scenarios, when the power generation capacity of the photovoltaic power generation device is extremely low, how to ensure reliable operation of the photovoltaic energy storage system is a problem to be solved.
Disclosure of Invention
The embodiment of the application provides a control method of an energy storage system and the energy storage system, which can control power conversion equipment to enter a preset working mode when the power generation capacity of the photovoltaic power generation equipment is extremely low, avoid the problem of overlarge power consumption of a power grid when the power conversion equipment runs with high power consumption, and further improve the running reliability of the energy storage system.
An embodiment of the present application provides a control method of an energy storage system, where the energy storage system includes a power conversion device, where the power conversion device is used to connect with a photovoltaic power generation device, the power conversion device includes a switch circuit, and the power conversion device is further used to connect with a load and a power grid through the switch circuit, and the power conversion device is used to implement energy transmission among the photovoltaic power generation device, the load and the power grid, and the control method includes: acquiring the demand information of the load; acquiring power generation information of the photovoltaic power generation equipment, wherein the power generation information comprises at least one of photovoltaic power generation power and photovoltaic power generation voltage of the photovoltaic power generation equipment; and controlling the conduction path of the switching circuit according to the demand information and the power generation information, and controlling the power conversion equipment to enter a corresponding working mode, wherein the working mode at least comprises a standby mode.
A control device of an energy storage system provided in a second aspect of the embodiment of the present application, where the energy storage system includes a power conversion device, where the power conversion device is configured to be connected to a photovoltaic power generation device, where the power conversion device includes a switching circuit, where the power conversion device is further configured to be connected to a load and a power grid through the switching circuit, and where the power conversion device is configured to implement energy transfer among the photovoltaic power generation device, the load and the power grid, where the control device includes: a demand information acquisition unit configured to acquire demand information of the load; a power generation information acquisition unit configured to acquire power generation information of the photovoltaic power generation apparatus, the power generation information including at least one of photovoltaic power generation power and photovoltaic power generation voltage of the photovoltaic power generation apparatus; and the control unit is used for controlling the conduction path of the switching circuit according to the demand information and the power generation information and controlling the power conversion equipment to enter a corresponding working mode, wherein the working mode at least comprises a standby mode.
A third aspect of the embodiments of the present application provides an energy storage system, including a power conversion device, a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the control method of the energy storage system when executing the computer program.
A fourth aspect of the embodiments of the present application provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method for controlling an energy storage system described above.
A fifth aspect of the embodiments of the present application provides a computer program product for causing an energy storage system to perform the steps of the method for controlling an energy storage system described above when the computer program product is run on the energy storage system.
In the embodiment of the application, the power generation capacity of the photovoltaic power generation device can be reflected by acquiring the demand information of the load and the power generation information of the photovoltaic power generation device, wherein the power generation information comprises at least one of the photovoltaic power generation power and the photovoltaic power generation voltage of the photovoltaic power generation device. Therefore, according to the demand information and the power generation information, the conduction path of the switching circuit of the power conversion equipment is controlled, and the power conversion equipment is controlled to enter a corresponding working mode. According to the embodiment of the application, the power conversion equipment can be controlled to enter the standby mode according to the demand information of the load and the power generation information of the photovoltaic power generation equipment, so that the problem that a large amount of power grids are required to be consumed when the power generation capacity of the photovoltaic power generation equipment is low and the power conversion equipment keeps high-power-consumption operation is avoided, and the operation reliability of the energy storage system can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an energy storage system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a switching circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a power conversion apparatus according to an embodiment of the present application;
fig. 4 is a schematic implementation flow chart of a control method of an energy storage system according to an embodiment of the present application;
FIG. 5 is a schematic flow chart of a specific implementation of energy storage device control according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a specific implementation flow of a control of an energy storage system for distinguishing a scene according to an embodiment of the present application;
Fig. 7 is a schematic flowchart of a specific implementation of a control method of an energy storage system according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a control device of an energy storage system according to an embodiment of the present application;
Fig. 9 is a schematic diagram of another structure of an energy storage system according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be protected by the present application based on the embodiments of the present application.
In some new energy systems, the power conversion device, the energy storage device, and the photovoltaic power generation device are connected to form a photovoltaic energy storage system. The photovoltaic power generation device can convert sunlight radiation energy into electric energy by utilizing the photovoltaic effect of the solar cell semiconductor material, and store the electric energy in the energy storage device or output the electric energy through the energy storage device. In some use scenarios, when the power generation capacity of the photovoltaic power generation device is extremely low, how to ensure reliable operation of the photovoltaic energy storage system is a problem to be solved.
In view of the above, the application provides a control method of an energy storage system, which can realize low power consumption and reliable operation of the energy storage system and improve the application scene of the energy storage system.
In order to illustrate the technical scheme of the application, the following description is made by specific examples.
Referring to fig. 1, fig. 1 illustrates an energy storage system provided by the present application. The energy storage system may include a power conversion device. In one aspect, the power conversion device may be used in connection with a photovoltaic power generation device. On the other hand, referring to the switching circuit shown in fig. 2, the power conversion device may include a switching circuit, and the power conversion device may be further connected to the LOAD and the GRID through the switching circuit. Further, the power conversion device may be used to enable energy transfer between the photovoltaic power generation device, the load and the grid.
Referring to fig. 2, the grid-connected relay is used to realize energy transmission between the power conversion device and the power grid, that is, when the grid-connected relay is closed, the power conversion device can output electric energy to the power grid, and can also receive electric energy from the power grid. The off-grid relay is used for realizing energy transmission between the power conversion equipment and the load, namely, when the off-grid relay is closed, the power conversion equipment can supply power to the load. The bypass relay is used for realizing energy transmission between the power grid and the load, namely, when the bypass relay is closed, the power grid can supply power to the load.
In some embodiments, when the power generation capacity of the photovoltaic power generation equipment is sufficient and the load does not need to supply power, the energy storage system controls the grid-connected relay to be closed, converts direct current input by the photovoltaic power generation equipment, and outputs the converted alternating current to the power grid.
In some embodiments, the energy storage system may further control the off-grid relay to be closed when the power generation capacity of the photovoltaic power generation device is sufficient and the load needs to be powered, convert direct current input by the photovoltaic power generation device, and output the converted alternating current to the load for power supply.
In some embodiments, the energy storage system may also close the off-grid relay when the power generation of the photovoltaic power generation device is sufficient, and the load needs to be powered. And when the energy storage system determines that the requirement of the load is met and the redundant electric energy exists, the grid-connected relay is controlled to be closed, and the redundant electric energy is output to the power grid.
The energy storage system can also control the bypass relay to be closed when the generated energy of the photovoltaic power generation equipment is insufficient and the load needs to be powered, and power is supplied to the load by using the power grid.
In some embodiments of the present application, as shown in fig. 3, the power conversion apparatus may further include an MPPT (Maximum Power Point Tracking ) circuit, an AC/DC (alternating current/direct current) circuit, and a DC/DC (direct current/direct current) circuit. The first end of the AC/DC circuit is connected with the switch circuit, the second end of the AC/DC circuit is connected with the second end of the DC/DC circuit through a direct current BUS (BUS), the second end of the DC/DC circuit is connected with the energy storage equipment BAT, the input end of the MPPT is connected with the photovoltaic power generation equipment, and the output end of the MPPT is connected with the direct current BUS.
Fig. 4 is a schematic implementation flow chart of a control method of an energy storage system according to an embodiment of the present application, where the method may be applied to the energy storage system shown in fig. 1.
Specifically, the control method of the energy storage system may include the following steps S401 to S403.
In step S401, the requirement information of the load is acquired.
The demand information of the load is used for representing whether the load has electricity demand or not. In the embodiment of the application, the demand information can be actively reported by the load when the load is accessed, and the demand information can be obtained by detecting the demand power of the load, so that the application is not limited.
Step S402, obtaining power generation information of the photovoltaic power generation device.
The power generation information may include at least one of a photovoltaic power generation power and a photovoltaic power generation voltage of the photovoltaic power generation device. It can be appreciated that the photovoltaic power generation power and the photovoltaic power generation voltage of the photovoltaic power generation device can reflect the power generation capacity of the photovoltaic power generation device, and further reflect the use scenario in which the energy storage system is located.
In the embodiment of the application, the power generation information of the photovoltaic power generation equipment can be acquired through a sensor arranged in the energy storage system, and can also be obtained by calculation according to the electric parameters output by the photovoltaic power generation equipment to the power conversion equipment, and the application is not limited.
Step S403, according to the demand information and the power generation information, controlling the conduction path of the switching circuit, and controlling the power conversion device to enter a corresponding working mode.
In the embodiment of the application, the use scene of the current energy storage system can be determined according to the demand information and the power generation information, the conduction path of the switch circuit is controlled according to the use scene, and the power conversion equipment is controlled to enter a corresponding working mode. Specifically, when the current energy storage system is in a use scene that the power generation capacity of the photovoltaic power generation equipment is weak, the conduction path of the switching circuit can be selectively changed, so that the power grid is connected with the load, the power grid supplies power to the load, and meanwhile, the power conversion equipment is controlled to enter a standby mode, so that the problem of high power consumption when the power conversion equipment operates with high power consumption is avoided. When the current energy storage system is in a use scene with stronger power generation capacity of the photovoltaic power generation equipment, the conduction path of the switching circuit can be selectively changed, and the power conversion equipment is controlled to enter a normal working mode, so that the photovoltaic power generation equipment can supply power to a load, and the effect of reducing the power consumption of a power grid is achieved.
In the embodiment of the application, the power generation capacity of the photovoltaic power generation device can be reflected by acquiring the demand information of the load and the power generation information of the photovoltaic power generation device, wherein the power generation information comprises at least one of the photovoltaic power generation power and the photovoltaic power generation voltage of the photovoltaic power generation device. Therefore, according to the demand information and the power generation information, the conduction path of the switching circuit of the power conversion equipment is controlled, and the power conversion equipment is controlled to enter a corresponding working mode. According to the embodiment of the application, the power conversion equipment can be controlled to enter the standby mode according to the demand information of the load and the power generation information of the photovoltaic power generation equipment, so that the problem that a large amount of power grids are required to be consumed when the power generation capacity of the photovoltaic power generation equipment is low and the power conversion equipment keeps high-power-consumption operation is avoided, and the operation reliability of the energy storage system can be improved.
In some embodiments of the present application, the step S403 may specifically include: and controlling the power conversion equipment to enter a standby mode when the duration time of the photovoltaic power generation power which is lower than the first power threshold value is longer than the first time threshold value or the photovoltaic power generation voltage is lower than the first voltage threshold value. And when the load has the demand information, controlling the switching circuit to conduct a first path of the power grid connected with the load.
That is, if the photovoltaic power generation power is lower than the first power threshold value or the photovoltaic power generation voltage is lower than the first voltage threshold value in the duration, the current photovoltaic power generation device has weaker power generation capacity, and the power grid supplies power for the power conversion device. Therefore, the power conversion equipment can be controlled to enter a standby mode, so that the power consumption of the power conversion equipment is reduced, and a large amount of electricity consumption of a power grid is avoided.
By way of example and not limitation, the power conversion device is controlled to enter the standby mode if the photovoltaic power generation power is less than 0W (the actual value may be determined according to the actual power consumption) or the photovoltaic power generation voltage is lower than the start-up voltage of the power conversion device (i.e., the threshold voltage for controlling the start-up of the power conversion device may be taken as the first voltage threshold value) within half an hour.
Meanwhile, if the load has demand information, the load is indicated to have electricity demand, and the photovoltaic power generation equipment is difficult to meet the demand, a bypass relay in the switching circuit can be controlled to be closed at the moment so as to conduct a first path of connection between the power grid and the load, and the power grid supplies power for the load.
Specifically, referring to fig. 2, the energy storage system may control the off-grid relay of the power conversion device to open, and close the bypass relay and the grid-connected relay of the power conversion device to supply power to the load through the power grid. In some embodiments, if a battery is built in the power conversion device, or the power input by the photovoltaic power generation device can maintain the power supply requirement when the power conversion device enters standby, the bypass relay may be only closed at this time, and the grid-connected relay may be opened.
In other embodiments of the present application, the step S403 may further specifically include: and controlling the power conversion equipment to enter a standby mode when the photovoltaic power generation power is lower than the power loss value of the power conversion equipment when the power conversion equipment is in idle load. And when the load has the demand information, controlling the switching circuit to conduct a first path of the power grid connected with the load.
That is, if the photovoltaic power generation power of the photovoltaic power generation device is lower than the standby power consumption when the power conversion device is empty, it indicates that the photovoltaic power generation power is insufficient, and the power consumption of the power conversion device is provided by the power grid. Therefore, the power conversion equipment can be controlled to enter a standby mode, so that the power consumption of the power conversion equipment is reduced, and a large amount of electricity consumption of a power grid is avoided.
Likewise, if the load has demand information indicating that the load has electricity demand and the photovoltaic power generation device has difficulty meeting the demand, a bypass relay in the switching circuit may be controlled to be closed to conduct a first path of the power grid connected with the load, and the power grid supplies power to the load.
In some embodiments of the present application, the energy storage system may further comprise an energy storage device coupled to the power conversion device. The energy storage device may include a battery pack that may be used to store electrical energy or release electrical energy. At this time, the control method of the energy storage system may further include: and acquiring electric quantity information of the energy storage equipment, controlling a conduction path of the switch circuit according to the electric quantity information, the demand information and the power generation information, and controlling the power conversion equipment and the energy storage equipment to enter corresponding working modes.
The Charge information may characterize a remaining Charge (SOC) of the battery pack, among other things. The power information may be obtained by a Battery management system (Battery MANAGEMENT SYSTEM, BMS) or calculated based on electrical parameters and a power algorithm, which is not a limitation of the present application.
That is, when the energy storage system is connected with the energy storage device, the energy storage system may control the switching circuit, the power conversion device, and the energy storage device in combination with the power information of the energy storage device, the demand information of the load, and the power generation information of the photovoltaic power generation device in step S403.
Specifically, in some embodiments of the present application, when the duration of the photovoltaic power generation power below the first power threshold is longer than the first time threshold or the photovoltaic power generation voltage is below the first voltage threshold, and the electric quantity information is above the power supplement threshold and below the discharge lower limit value, the power conversion device and the energy storage device may be controlled to enter a standby mode, and when the load has the requirement information, the bypass relay in the switch circuit is controlled to be closed so as to conduct the first path of the connection between the power grid and the load.
The power-up threshold is a threshold for the battery pack to be charged, and the discharging lower limit value is a lower limit value for the battery pack to be discharged outwards. In some embodiments, the power up threshold may be set to 5% of the remaining battery power and the lower discharge limit may be set to 10% of the remaining battery power. In other embodiments, the setting may be performed according to actual circumstances.
That is, if the power information is higher than the power compensation threshold and lower than the discharge lower limit, it indicates that the energy storage device cannot discharge at this time and does not need to be charged, and the power conversion device does not work. If the duration time of the photovoltaic power generation power lower than the first power threshold is longer than the first time threshold or the photovoltaic power generation voltage is lower than the first voltage threshold, namely the power generation capacity of the photovoltaic power generation equipment is lower, the power conversion equipment and the energy storage equipment can be controlled to enter a standby mode so as to reduce the reduction of the power conversion equipment and the energy storage equipment, and further, a large amount of electricity consumption of a power grid is avoided. In the embodiment of the application, only the controller in the power conversion equipment is powered in the standby mode, and other components are not powered. In the standby mode of the energy storage equipment, only the controller in the energy storage equipment is powered on, and other components are not powered on. In other embodiments, the standby mode may also be different depending on the usage scenario or user equipment.
Likewise, if the load has demand information indicating that the load has electricity demand and the photovoltaic power generation device has difficulty meeting the demand, the bypass relay of the switching circuit may be controlled to be closed to conduct the first path of the power grid connected with the load, and the power grid supplies power to the load.
In practical applications, if the energy storage system includes a plurality of energy storage devices, when the load power consumption is low, the loss of low-power supply will be increased when the plurality of energy storage devices supply power to the load together. In response to this problem, in some embodiments of the present application, the method for controlling an energy storage system may further include: and acquiring load power in the demand information, determining target energy storage equipment according to the electric quantity information of the energy storage equipment under the condition that the duration time of the photovoltaic power generation power lower than the first power threshold is longer than the first time threshold or the photovoltaic power generation voltage lower than the first voltage threshold, the duration time of the load power lower than the second power threshold is longer than the second time threshold and the electric quantity information is higher than the discharge lower limit value, and controlling the target energy storage equipment to enter a standby mode. And controlling the switching circuit to conduct a second path of the power conversion device connected with the load and to control the non-target energy storage device and the power conversion device to enter a discharge mode.
The target energy storage device may be any one of a plurality of energy storage devices.
That is, if the duration of the photovoltaic power generation power lower than the first power threshold value is longer than the first time threshold value or the photovoltaic power generation voltage is lower than the first voltage threshold value, it is indicated that the power generation capability of the photovoltaic power generation apparatus is weak. At this time, if the load power is lower than the second power threshold for a long time and the electric quantity information is higher than the discharge lower limit value, the load power is lower, and the energy storage device can supply power to the load, the target energy storage device can be determined according to the electric quantity information of the energy storage device, and the target energy storage device is controlled to enter a standby mode. Meanwhile, a second path connected with the load is conducted through the control switch circuit, and the non-target energy storage device and the power conversion device are controlled to enter a discharging mode, so that the non-target energy storage device can discharge to the load through the power conversion device, and the electricity consumption requirement of the load is met.
The determination modes of the target energy storage device and the non-target energy storage device can be selected according to actual conditions. For example, the energy storage device with the highest electric quantity can be used as a non-target energy storage device, and the rest energy storage devices are used as target energy storage devices.
By way of example and not limitation, if the photovoltaic power generation power is less than 0W in half an hour, or the photovoltaic power generation voltage is lower than the starting voltage of the power conversion device, and if the load power is less than 500W in half an hour, and the remaining power of the energy storage device is greater than 10%, then the energy storage device with the highest power may be controlled to discharge, and the other energy storage devices enter a standby mode.
In this way, the power consumption of the energy storage system can be further reduced because the target energy storage device is in a standby mode with low power consumption.
Referring to fig. 5, after the non-target energy storage device and the power conversion device are controlled to enter the discharging mode, the remaining capacity information of the non-target energy storage device may be monitored, if the remaining capacity information is lower than the first capacity threshold, the non-target energy storage device may be controlled to enter the standby mode, and the one with the highest capacity in the target energy storage device is controlled to enter the discharging mode, so as to realize the balanced discharging of the energy storage device. Until the power of each energy storage device is lower than the second power threshold. The first electric quantity threshold value and the second electric quantity threshold value can be set according to actual conditions, for example, the first electric quantity threshold value can be a difference value between the lowest electric quantity in each energy storage device and a preset value (such as 5 percent); the second power threshold may be 10% when the energy storage system is grid-connected and may be 5% when the energy storage system is off-grid. If the bus voltage is detected to be lower than the voltage threshold (785V, for example), or the load power is higher than the power threshold (2 kw, for example), or the photovoltaic power generation power is lower than the sum of the load power and the power loss value of the energy storage equipment when no load exists, all the energy storage equipment can be controlled to enter a discharging mode so as to meet the power consumption requirement of the load.
In other embodiments of the present application, the method for controlling an energy storage device may further include: when the insertion of the photovoltaic power generation equipment is detected, the output of the photovoltaic power generation equipment is subjected to weak light detection, the conduction path of the switch circuit is controlled according to the weak light detection result and the demand information of the load, and the power conversion equipment and the energy storage equipment are controlled to enter corresponding working modes.
Wherein the weak light detection is used for detecting whether a photovoltaic panel of the photovoltaic power generation device is irradiated by weak light. The result of the weak light detection can reflect the power generation capability of the photovoltaic power generation device. Therefore, the energy storage system can also control the conduction path of the switch circuit according to the weak light detection result and the load demand information, and control the power conversion equipment and the energy storage equipment to enter corresponding working modes.
Specifically, in some embodiments of the present application, performing weak light detection on an output of a photovoltaic power generation device may include: and sending a first control instruction to the MPPT circuit, and determining that the input of the photovoltaic power generation equipment is weak light when the bus voltage is detected to not reach the target voltage value.
The first control instruction can be used for controlling the MPPT circuit to convert electric energy output by the photovoltaic power generation equipment so as to raise the bus voltage of the direct current bus to a target voltage value.
For example, the MPPT circuit may be controlled to operate in a boost mode, and boost open loop control is performed to raise the bus voltage of the dc bus to 700V, where the light is sufficient, the bus voltage will reach 700V. If the bus voltage is detected to be less than 700V, the input of the photovoltaic power generation apparatus may be determined to be weak light.
In other embodiments of the present application, detecting weak light at the output of a photovoltaic power plant may include: and controlling the MPPT circuit to convert the voltage of direct current output by the photovoltaic power generation equipment, outputting the converted direct current to a direct current bus, and sending a second control instruction to the DC/DC circuit when the bus voltage of the direct current bus reaches a preset bus voltage value. And when the bus voltage is detected to be lower than the second voltage threshold value in the process of lifting the output voltage by the DC/DC circuit, determining that the input of the photovoltaic power generation equipment is weak light.
The second control instruction is used for controlling the DC/DC circuit to convert the electric energy of the direct current bus so as to output a preset voltage value to the energy storage equipment.
For example, the MPPT circuit may be controlled to operate in boost mode, with boost open loop control to raise the DC bus to 700V. Then the voltage output by the DC/DC circuit to the energy storage device is gradually increased, and if the bus voltage is pulled down to below 400V when the output voltage is increased by the DC/DC circuit, the input of the photovoltaic power generation device can be determined to be weak light.
In other embodiments, the MPPT circuit may be controlled to operate in boost mode, with boost open loop control to raise the DC bus to 700V. Then, the voltage output by the AC/DC circuit to the power grid side is gradually increased, and if the bus voltage is pulled down to be below 400V when the output voltage is increased by the AC/DC circuit, the input of the photovoltaic power generation equipment can be determined to be weak light.
Similarly, if the input to the photovoltaic power plant is low light, the power conversion plant may be controlled to enter a standby mode. If the load has the demand information, the switching circuit can be controlled to conduct a first path of the power grid connected with the load, and the power grid supplies power for the load.
If the input of the photovoltaic power generation device is strong light, the power conversion device can be controlled to enter a normal working mode. At this time, the energy storage system may also control the energy storage device in the standby mode to enter the charging mode.
Specifically, in some embodiments, in a zero-power internet surfing mode (i.e., the energy storage system does not output electric energy to the power grid), if the converted power of the MPPT circuit is greater than a certain threshold (e.g., 40W) and no power is taken from the power grid (e.g., the reading of the electric meter is substantially 0), the energy storage device may be controlled to enter a charging mode, and the energy storage device is charged by the photovoltaic power generation device.
In other embodiments, in the limited power internet mode (i.e., the energy storage system is set to output electric energy below the preset power value to the power grid), if the electric meter indicates that the power fed by the power conversion device to the power grid is greater than the power loss value when the power conversion device is idle and the duration is greater than a third preset duration (e.g., 2 minutes), the energy storage device may be controlled to enter the charging mode, and the energy storage device is charged through the photovoltaic power generation device.
For ease of understanding, please refer to the control flow diagrams of the energy storage system shown in fig. 6 and 7. First, a purely photovoltaic grid-connected scenario (without energy storage device connected to the grid), a photovoltaic grid-connected operation scenario (with energy storage device connected to the grid), an photovoltaic off-grid operation scenario (with energy storage device connected to the grid) may be distinguished by determining whether the power conversion device is connected to the energy storage device and the grid.
In the pure photovoltaic grid-connected scenario, the power conversion device can be controlled to enter a standby mode when the duration time of the photovoltaic power generation power lower than the first power threshold value is longer than the first time threshold value or the photovoltaic power generation voltage is lower than the first voltage threshold value. And when the load has the demand information, controlling a bypass relay of the switching circuit to be closed so as to conduct a first path of the power grid connected with the load.
In the light storage grid-connected operation scene, when the duration time of the photovoltaic power generation power lower than the first power threshold value is longer than the first time threshold value or the photovoltaic power generation voltage is lower than the first voltage threshold value, and the electric quantity information is higher than the power supplementing threshold value and lower than the discharging lower limit value, the power conversion equipment and the energy storage equipment are controlled to enter a standby mode, and when the load has the demand information, the bypass relay of the switching circuit is controlled to be closed so as to conduct the first path of the connection between the power grid and the load.
If the photovoltaic power generation power is higher than the power loss value of the power conversion equipment when the power conversion equipment is in idle load and the electric quantity information of the energy storage equipment is lower than the lower limit value of discharge, the power conversion equipment is controlled to be shut down, or the energy storage system is controlled to be shut down under the condition that the photovoltaic power generation power is 0.
Correspondingly, an auxiliary source circuit is arranged in the power conversion equipment, and the auxiliary source circuit can work for a controller in the power conversion equipment after converting electric energy input by the photovoltaic power generation equipment. The controller in the power conversion device may detect whether the energy storage device is in an operational state when the auxiliary source circuit is powered. If the energy storage device is in the working mode, the energy storage device and the power conversion device can be controlled in the working mode according to the mode. If the energy storage device is in a standby mode, the insulation resistance can be detected to ensure the electricity safety. After the insulation impedance detection is completed, whether the energy storage system is connected to a power grid or not can be detected.
Under the condition that the energy storage system is connected with the power grid, whether the voltage frequency of the alternating current obtained by conversion of the power conversion equipment meets the grid-connected requirement or not can be confirmed, so that the frequency of the currently output alternating current is confirmed to be consistent with the frequency of the power grid. In some embodiments, if the power information of the energy storage device is below the power-up threshold, or the power information is above the power-up threshold and above the discharge upper limit, or the power information is above the power-up threshold and the photovoltaic power generation power is above the starting voltage of the power conversion device, the self-test may be performed after a preset period of time (e.g., 60 s), for example, the self-test of the leakage current sampling Circuit, the self-test of the relay, and the self-test of the Arc Fault Circuit-Interrupter (AFCI) Circuit may be performed. After the self-checking is passed, the grid-connected relay and the off-grid relay are closed, the bypass relay is opened, and the energy storage system enters an alternating current power-supplementing mode or a spontaneous self-using mode. In the alternating current supplementing mode, the power conversion equipment charges the energy storage equipment by utilizing the electric energy of the photovoltaic power generation equipment or the electric network. In the self-powered mode, the power conversion device uses the electrical energy of the energy storage device and/or the photovoltaic power generation device to power the load, or uses the electrical energy of the photovoltaic power generation device to power the energy storage device and the load, and does not feed the power grid.
Under the condition that the energy storage system is not connected to a power grid, if the energy storage equipment is in a standby mode and the electric quantity information is lower than the electricity supplementing threshold value, the non-target energy storage equipment can be started through weak light detection when the input is strong light, and when the photovoltaic power generation power is larger than the sum of the load power and the power loss value of the energy storage equipment when the energy storage equipment is in no-load, and the power grid is detected, all the energy storage equipment is controlled to be started, the energy storage equipment is powered, and then the energy storage equipment and the power conversion equipment are controlled in a working mode in the mode. The power conversion device may be turned on if the energy storage device is in an operational mode or the charge information is above a charge threshold. If the weak light detection input is weak light, then a period of time (e.g., 5 minutes) may be waited for and the weak light detection and grid tie condition detection may be repeated.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts described, as some steps may occur in other orders in accordance with the application.
Fig. 8 is a schematic structural diagram of a control device 800 of an energy storage system according to an embodiment of the present application, where the control device 800 of the energy storage system is configured on the energy storage system.
Specifically, the control device 800 of the energy storage system may include:
A demand information acquisition unit 801 configured to acquire demand information of the load;
a power generation information acquisition unit 802 configured to acquire power generation information of the photovoltaic power generation apparatus, the power generation information including at least one of photovoltaic power generation power and photovoltaic power generation voltage of the photovoltaic power generation apparatus;
and a control unit 803, configured to control a conduction path of the switching circuit according to the requirement information and the power generation information, and control the power conversion device to enter a corresponding operation mode, where the operation mode at least includes a standby mode.
In some embodiments of the present application, the control unit 803 may be specifically configured to: controlling the power conversion equipment to enter a standby mode when the duration time of the photovoltaic power generation power lower than a first power threshold value is longer than a first time threshold value or the photovoltaic power generation voltage is lower than a first voltage threshold value; and when the load has the demand information, controlling the switching circuit to conduct a first path of the power grid connected with the load.
In some embodiments of the present application, the control unit 803 may be specifically configured to: when the photovoltaic power generation power is lower than a power loss value of the power conversion equipment when the power conversion equipment is in idle load, controlling the power conversion equipment to enter a standby mode; and when the load has the demand information, controlling the switching circuit to conduct a first path of the power grid connected with the load.
In some embodiments of the present application, the control unit 803 may be specifically configured to: acquiring electric quantity information of the energy storage equipment; and controlling the conduction path of the switch circuit according to the electric quantity information, the demand information and the power generation information, and controlling the power conversion equipment and the energy storage equipment to enter corresponding working modes.
In some embodiments of the present application, the control unit 803 may be specifically configured to: and when the duration time of the photovoltaic power generation power lower than a first power threshold value is longer than a first time threshold value or the photovoltaic power generation voltage is lower than a first voltage threshold value, and the electric quantity information is higher than a power supplementing threshold value and lower than a discharging lower limit value, controlling the power conversion equipment and the energy storage equipment to enter a standby mode, and controlling the switching circuit to conduct a first path for connecting the power grid and the load under the condition that the load has the demand information.
In some embodiments of the present application, the control unit 803 may be specifically configured to: the control method further includes: acquiring load power in the demand information; when the duration time of the photovoltaic power generation power lower than a first power threshold value is longer than a first time threshold value or the photovoltaic power generation voltage lower than a first voltage threshold value, the duration time of the load power lower than a second power threshold value is longer than a second time threshold value, and the electric quantity information is higher than a discharge lower limit value, determining a target energy storage device according to the electric quantity information of the energy storage device, and controlling the target energy storage device to enter a standby mode; and controlling a switching circuit to conduct a second path of the power conversion equipment connected with the load, and controlling the non-target energy storage equipment and the power conversion equipment to enter a discharging mode.
In some embodiments of the present application, the control unit 803 may be specifically configured to: when the insertion of the photovoltaic power generation equipment is detected, carrying out weak light detection on the output of the photovoltaic power generation equipment; and controlling the conduction path of the switching circuit according to the weak light detection result and the demand information of the load, and controlling the power conversion equipment and the energy storage equipment to enter corresponding working modes.
In some embodiments of the present application, the control unit 803 may be specifically configured to: sending a first control instruction to the MPPT circuit, wherein the first control instruction is used for controlling the MPPT circuit to convert electric energy output by the photovoltaic power generation equipment so as to raise the bus voltage of the direct current bus to a target voltage value; and when the bus voltage is detected not to reach the target voltage value, determining that the input of the photovoltaic power generation equipment is weak light.
In some embodiments of the present application, the control unit 803 may be specifically configured to: controlling the MPPT circuit to convert the voltage of the direct current output by the photovoltaic power generation equipment and then output the converted voltage to the direct current bus; when the bus voltage of the direct current bus reaches a preset bus voltage value, a second control instruction is sent to the DC/DC circuit, and the second control instruction is used for controlling the DC/DC circuit to convert the electric energy of the direct current bus so as to output the preset voltage value to the energy storage equipment; and when the bus voltage is detected to be lower than a second voltage threshold value in the process of lifting the output voltage by the DC/DC circuit, determining that the input of the photovoltaic power generation equipment is weak light.
It should be noted that, for convenience and brevity of description, the specific working process of the control device 800 of the energy storage system may refer to the corresponding process of the method described in fig. 4 to 7, and will not be described herein again.
Fig. 9 is a schematic diagram of an energy storage system according to an embodiment of the present application. The energy storage system 9 may include: a processor 90, a memory 91 and a computer program 92, such as a control program of an energy storage system, stored in said memory 91 and executable on said processor 90. Also, the energy storage system 9 may further comprise the aforementioned power conversion device 93.
In some embodiments, the energy storage system 9 may further include an energy storage device coupled to the power conversion device 93, and the processor 90, the memory 91, and the computer program 92 may be co-configured with the battery pack within the energy storage device.
The processor 90, when executing the computer program 92, implements the steps of the control method embodiment of each energy storage system described above, such as steps S401 to S403 shown in fig. 4. Or the processor 90 when executing the computer program 92 implements the functions of the modules/units in the above-described device embodiments, such as the functions of the demand information acquisition unit 801, the power generation information acquisition unit 802, and the control unit 803 shown in fig. 8.
The computer program may be divided into one or more modules/units which are stored in the memory 91 and executed by the processor 90 to complete the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the energy storage system.
For example, the computer program may be split into: a demand information acquisition unit, a power generation information acquisition unit, and a control unit. The specific functions of each unit are as follows: a demand information acquisition unit configured to acquire demand information of the load; a power generation information acquisition unit configured to acquire power generation information of the photovoltaic power generation apparatus, the power generation information including at least one of photovoltaic power generation power and photovoltaic power generation voltage of the photovoltaic power generation apparatus; and the control unit is used for controlling the conduction path of the switching circuit according to the demand information and the power generation information and controlling the power conversion equipment to enter a corresponding working mode, wherein the working mode at least comprises a standby mode.
The energy storage system may include, but is not limited to, a processor 90, a memory 91. It will be appreciated by those skilled in the art that fig. 9 is merely an example of an energy storage system and is not intended to be limiting, and that more or fewer components than shown may be included, or certain components may be combined, or different components may be included, for example, the energy storage system may also include input and output devices, network access devices, buses, etc.
The processor 90 may be a central processing unit (Central Processing Unit, CPU), other general purpose processor, digital signal processor (DIGITAL SIGNAL processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf programmable gate array (field-programmable GATE ARRAY, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 91 may be an internal storage unit of the energy storage system, such as a hard disk or a memory of the energy storage system. The memory 91 may also be an external storage device of the energy storage system, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD) or the like. Further, the memory 91 may also include both an internal storage unit and an external storage device of the energy storage system. The memory 91 is used for storing the computer program as well as other programs and data required by the energy storage system. The memory 91 may also be used for temporarily storing data that has been output or is to be output.
It should be noted that, for convenience and brevity of description, the structure of the energy storage system may also refer to a specific description of the structure in the method embodiment, which is not repeated herein.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided herein, it should be understood that the disclosed apparatus/energy storage system and method may be implemented in other ways. For example, the apparatus/energy storage system embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of 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.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A control method of an energy storage system, characterized in that the energy storage system comprises a power conversion device for connection with a photovoltaic power generation device, the power conversion device comprising a switching circuit, the power conversion device further being for connection with a load, a grid through the switching circuit, the power conversion device being for enabling energy transfer between the photovoltaic power generation device, the load and the grid, the control method comprising:
Acquiring the demand information of the load;
Acquiring power generation information of the photovoltaic power generation equipment, wherein the power generation information comprises at least one of photovoltaic power generation power and photovoltaic power generation voltage of the photovoltaic power generation equipment;
And controlling the conduction path of the switching circuit according to the demand information and the power generation information, and controlling the power conversion equipment to enter a corresponding working mode, wherein the working mode at least comprises a standby mode.
2. The control method according to claim 1, wherein controlling the conduction path of the switching circuit and controlling the power conversion apparatus to enter the corresponding operation mode according to the demand information and the power generation information includes:
Controlling the power conversion equipment to enter a standby mode when the duration time of the photovoltaic power generation power lower than a first power threshold value is longer than a first time threshold value or the photovoltaic power generation voltage is lower than a first voltage threshold value;
And when the load has the demand information, controlling the switching circuit to conduct a first path of the power grid connected with the load.
3. The control method according to claim 1, wherein controlling the conduction path of the switching circuit and controlling the power conversion apparatus to enter the corresponding operation mode according to the demand information and the power generation information includes:
when the photovoltaic power generation power is lower than a power loss value of the power conversion equipment when the power conversion equipment is in idle load, controlling the power conversion equipment to enter a standby mode;
And when the load has the demand information, controlling the switching circuit to conduct a first path of the power grid connected with the load.
4. A control method according to claim 2 or 3, wherein the energy storage system further comprises an energy storage device connected to the power conversion device, the control method further comprising:
Acquiring electric quantity information of the energy storage equipment;
And controlling the conduction path of the switch circuit according to the electric quantity information, the demand information and the power generation information, and controlling the power conversion equipment and the energy storage equipment to enter corresponding working modes.
5. The control method according to claim 4, wherein the controlling the conduction path of the switching circuit and controlling the power conversion device and the energy storage device to enter the corresponding operation modes according to the electric quantity information, the demand information, and the power generation information includes:
And when the duration time of the photovoltaic power generation power lower than a first power threshold value is longer than a first time threshold value or the photovoltaic power generation voltage is lower than a first voltage threshold value, and the electric quantity information is higher than a power supplementing threshold value and lower than a discharging lower limit value, controlling the power conversion equipment and the energy storage equipment to enter a standby mode, and controlling the switching circuit to conduct a first path for connecting the power grid and the load under the condition that the load has the demand information.
6. The control method of claim 5, wherein the energy storage system comprises a plurality of energy storage devices;
The control method further includes:
acquiring load power in the demand information;
When the duration time of the photovoltaic power generation power lower than a first power threshold value is longer than a first time threshold value or the photovoltaic power generation voltage lower than a first voltage threshold value, the duration time of the load power lower than a second power threshold value is longer than a second time threshold value, and the electric quantity information is higher than a discharge lower limit value, determining a target energy storage device according to the electric quantity information of the energy storage device, and controlling the target energy storage device to enter a standby mode;
and controlling a switching circuit to conduct a second path of the power conversion equipment connected with the load, and controlling the non-target energy storage equipment and the power conversion equipment to enter a discharging mode.
7. The control method according to claim 6, characterized in that the control method further comprises:
When the insertion of the photovoltaic power generation equipment is detected, carrying out weak light detection on the output of the photovoltaic power generation equipment;
And controlling the conduction path of the switching circuit according to the weak light detection result and the demand information of the load, and controlling the power conversion equipment and the energy storage equipment to enter corresponding working modes.
8. The control method according to claim 7, wherein the power conversion device further comprises an MPPT circuit, an AC/DC circuit, and a DC/DC circuit, a first end of the AC/DC circuit being connected to the switching circuit, a second end of the AC/DC circuit being connected to the second end of the DC/DC circuit through a DC bus, a second end of the DC/DC circuit being connected to the energy storage device, an input end of the MPPT being connected to the photovoltaic power generation device, an output end of the MPPT being connected to the DC bus;
the weak light detection of the output of the photovoltaic power generation device comprises the following steps:
sending a first control instruction to the MPPT circuit, wherein the first control instruction is used for controlling the MPPT circuit to convert electric energy output by the photovoltaic power generation equipment so as to raise the bus voltage of the direct current bus to a target voltage value;
And when the bus voltage is detected not to reach the target voltage value, determining that the input of the photovoltaic power generation equipment is weak light.
9. The control method according to claim 7, wherein the power conversion device further comprises an MPPT circuit, an AC/DC circuit, and a DC/DC circuit, a first end of the AC/DC circuit being connected to the switching circuit, a second end of the AC/DC circuit being connected to the second end of the DC/DC circuit through a DC bus, a second end of the DC/DC circuit being connected to the energy storage device, an input end of the MPPT being connected to the photovoltaic power generation device, an output end of the MPPT being connected to the DC bus;
the weak light detection of the output of the photovoltaic power generation device comprises the following steps:
Controlling the MPPT circuit to convert the voltage of the direct current output by the photovoltaic power generation equipment and then output the converted voltage to the direct current bus;
When the bus voltage of the direct current bus reaches a preset bus voltage value, a second control instruction is sent to the DC/DC circuit, and the second control instruction is used for controlling the DC/DC circuit to convert the electric energy of the direct current bus so as to output the preset voltage value to the energy storage equipment;
And when the bus voltage is detected to be lower than a second voltage threshold value in the process of lifting the output voltage by the DC/DC circuit, determining that the input of the photovoltaic power generation equipment is weak light.
10. An energy storage system comprising a power conversion device, a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the control method according to any one of claims 1 to 9 when the computer program is executed.
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