New energy power supply system

Abstract

The invention discloses a new energy power supply system, and relates to the technical field of power grid control. The system comprises an energy storage device, a power generation device, a system controller, a first switch, a second switch and at least one power load device. A connecting end after the electric power interaction end of the energy storage device is connected with the electric power interaction end of the power generation device is respectively connected with a first end of the first switch and a first end of the second switch, a second end of the first switch is connected with a grid-connected point, and a second end of the second switch is respectively connected with a power supply access end of the electric power load equipment and the grid-connected point; the system controller is used for responding to the mode switching instruction, enabling the system to operate in an off-grid mode or in a grid-connected mode or enabling the system to enter a grid-connected or off-grid state in a self-adaptive mode according to the states of a grid-connected point and the power load equipment, so that the power load equipment can be kept in an effective power supply state all the time, and the operation reliability of the new energy power supply system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid control, and in particular to a new energy power supply system. Background Art

[0002] With the rapid development of new energy technologies, new energy power supply systems not only undertake the task of providing clean energy for load equipment, but also play an important role in off-grid support when the power grid to which the new energy power supply system is connected loses power. At present, common new energy power supply systems include new energy power generation devices, energy storage devices, and power load equipment that ensures the normal operation of the power supply system, such as fire-fighting equipment, cooling equipment, etc. During the operation of the new energy power supply system, it is necessary to ensure that the above-mentioned power load equipment is effectively powered at all times to ensure the safe operation of the new energy power supply system.

[0003] At present, the existing new energy power supply system mostly connects the power load equipment to the grid connection point between the new energy power supply system and the external power grid, and obtains electricity from the external power grid to power the power load equipment. However, if the external power grid loses power, the power load equipment may not be able to obtain stable power supply, which may cause the power load equipment such as fire-fighting equipment to fail to operate normally, resulting in low operating reliability of the existing new energy power supply system. Summary of the invention

[0004] In view of this, the present application provides a new energy power supply system, the main purpose of which is to solve the technical problem of low operating reliability of existing new energy power supply systems.

[0005] According to a first aspect of the present invention, there is provided a new energy power supply system, the new energy power supply system comprising: an energy storage device, a power generation device, a system controller, a first switch, a second switch and at least one power load device;

[0006] The connection ends of the power interaction end of the energy storage device connected to the power interaction end of the power generation device are respectively connected to the first end of the first switch and the first end of the second switch, the second end of the first switch is connected to the grid connection point, and the second end of the second switch is respectively connected to the power access end of the power load equipment and the grid connection point;

[0007] The system controller is configured to perform the following processes:

[0008] Receiving a mode switching instruction, wherein the mode switching instruction includes a forced grid connection instruction, a forced off-grid instruction, or an automatic mode instruction;

[0009] When the mode switching instruction is the forced grid-connection instruction, performing a grid-connection operation on the system, so that the first switch is turned on, the second switch is turned off, and the power generation device and the energy storage device are connected to the grid-connection point;

[0010] When the mode switching instruction is the forced off-grid instruction, an off-grid operation is performed on the system to disconnect the first switch, connect the second switch, and connect the power generation device and the energy storage device to the power load device;

[0011] When the mode switching instruction is the automatic mode instruction, the system is controlled to enter the automatic mode to monitor the power status of the grid-connected point and the power load equipment, and based on the power status, the system performs the grid-connected operation or the off-grid operation.

[0012] Optionally, the system also includes a dual power switching switch; the power output end of the dual power switching switch is connected to the power access end of the power load equipment, the first power input end of the dual power switching switch is connected to the second end of the second switch, and the second power input end of the dual power switching switch is connected to the grid connection point; the system controller is also used to control the dual power switching switch to connect the power access end of the power load equipment to the second end of the second switch, or to connect the power access end of the power load equipment to the grid connection point.

[0013] Optionally, the system controller receives the mode switching instruction from a remote control device, the control device comprising a knob switch having a grid-connected switch, an off-grid switch and an emergency stop switch, the knob switch being used to put one of the grid-connected switch, the off-grid switch and the emergency stop switch in an on state; the system controller is also configured to perform the following processing: determining whether the emergency stop switch is on, and when the emergency stop switch is on, controlling the energy storage device to shut down, and when the emergency stop switch is off, determining whether the grid-connected switch is off; if the grid-connected switch is off, determining the switching state of the off-grid switch, and when the off-grid switch is on, performing the off-grid operation on the system, and when the off-grid switch is off, making the system enter the automatic mode; if the grid-connected switch is not off, determining the switching state of the off-grid switch, and when the off-grid switch is off, determining whether the power state of the grid-connected point is in a power-off state, and when the grid-connected point is in a power-off state, performing the grid-connected operation.

[0014] Optionally, the system controller is also used to perform a switching failure operation on the new energy power supply system; the system controller performs the switching failure operation on the new energy power supply system by controlling the energy storage device to shut down and disconnecting the first switch and the second switch.

[0015] Optionally, the system controller performs the grid-connected operation on the system, including: the system controller determines whether the energy storage device is in a shutdown state; when the energy storage device is in a shutdown state, determines whether the first switch is in an on state; when the first switch is in an on state, determines whether the second switch is in an off state; when the second switch is in an off state, sends grid-connected instruction information to the energy storage device; determines whether the energy storage device is in a grid-connected mode after a preset grid-connected waiting time; when the energy storage device is in a grid-connected mode, issues a grid-connected prompt message; when the energy storage device is not in a grid-connected mode, performs the switching failure operation on the new energy power supply system and issues an alarm prompt message.

[0016] Optionally, when the system controller determines that the energy storage device is not in a shutdown state, a first preset operation is performed, wherein the first preset operation includes: sending a shutdown instruction to the energy storage device and monitoring the operating state of the energy storage device, and determining whether the energy storage device is shut down within a first preset waiting time; when the energy storage device is shut down within the first preset waiting time, performing the step of determining whether the first switch is in an on state; when the energy storage device is not shut down within the first preset waiting time, performing the switching failure operation on the system and issuing an alarm prompt message; when the system controller determines that the first switch is not in an on state, performing a second preset operation, wherein the second preset operation includes: sending an on instruction to the first switch and monitoring the on-off state of the first switch, and determining whether the first switch is in an on-state within a second preset waiting time whether the first switch is turned on; when the first switch is turned on within the second preset waiting time, executing the step of determining whether the second switch is in the disconnected state; when the first switch is not turned on within the second preset waiting time, executing the switching failure operation on the system and issuing an alarm prompt message; when the system controller determines that the second switch is not in the disconnected state, executing a third preset operation, wherein the third preset operation includes: sending a disconnection instruction to the second switch and monitoring the on-off state of the second switch, and determining whether the second switch is disconnected within the third preset waiting time; when the second switch is disconnected within the third preset waiting time, executing the step of sending the grid connection instruction information to the energy storage device; when the second switch is not disconnected within the third preset waiting time, executing the switching failure operation on the system and issuing an alarm prompt message.

[0017] Optionally, the system controller performs the off-grid operation on the system in a manner including: the system controller determines whether the energy storage device is in a shutdown state; when the energy storage device is in a shutdown state, determines whether the first switch is in a disconnected state; when the first switch is in a disconnected state, determines whether the second switch is in a conducting state; when the second switch is in a conducting state, sends off-grid instruction information to the energy storage device; determines whether the power state of the grid connection point is a power-off state after a preset off-grid waiting time; when the power state of the grid connection point is not a power-off state, determines whether the energy storage device is in an off-grid mode; when the energy storage device is in an off-grid mode, issues an off-grid prompt message; when the energy storage device is not in an off-grid mode, performs the switching failure operation on the new energy power supply system and issues an alarm prompt message.

[0018] Optionally, when the system controller determines that the energy storage device is not in a shutdown state, a fourth preset operation is performed, wherein the fourth preset operation includes: sending a shutdown instruction to the energy storage device and monitoring the operating state of the energy storage device, and determining whether the energy storage device is shut down within a fourth preset waiting time; when the energy storage device is shut down within the fourth preset waiting time, performing the step of determining whether the first switch is in a disconnected state; when the energy storage device is not shut down within the fourth preset waiting time, performing the switching failure operation on the system and issuing an alarm prompt message; when the system controller determines that the first switch is not in a disconnected state, performing a fifth preset operation, wherein the fifth preset operation includes: sending a disconnection instruction to the first switch and monitoring the on-off state of the first switch, and determining whether the first switch is in a disconnected state within the fifth preset waiting time. whether the second switch is disconnected; when the first switch is disconnected within the fifth preset waiting time, executing the step of determining whether the second switch is in the on state; when the first switch is not disconnected within the fifth preset waiting time, executing the switching failure operation on the system and issuing an alarm prompt message; when the system controller determines that the second switch is not in the on state, executing the sixth preset operation, wherein the sixth preset operation includes: sending a conduction instruction to the second switch and monitoring the on-off state of the second switch, and determining whether the second switch is on within the sixth preset waiting time; when the second switch is on within the sixth preset waiting time, executing the step of sending off-grid instruction information to the energy storage device; when the second switch is not on within the sixth preset waiting time, executing the switching failure operation on the system and issuing an alarm prompt message.

[0019] Optionally, the system controller controls the system to enter an automatic mode, including: monitoring whether the grid connection point voltage of the grid connection point is greater than a first preset voltage value; when the grid connection point voltage is greater than the first preset voltage value, determining whether there is at least one of the power load devices in a power-off state and the energy storage device in a energized state; when there is at least one of the power load devices in a power-off state and the energy storage device in a energized state, performing the grid-connected operation on the system; when the grid connection point voltage is less than the first preset voltage value, determining whether the grid connection point voltage is less than a second preset voltage value; when the grid connection point voltage is less than the second preset voltage value, determining whether there is at least one of the power load devices in a power-off state; when there is at least one of the power load devices in a power-off state, performing the off-grid operation on the system; when the grid connection point voltage is not greater than the first preset voltage value and not less than the second preset voltage value, performing the switching failure operation on the system and issuing an alarm prompt message.

[0020] Optionally, the system controller is also configured to perform the following processing: when the first switch is disconnected, the second switch is turned on, and the energy storage device is in the off-grid mode, monitoring the power and discharge status of the energy storage device; when the power of the energy storage device is lower than a preset power threshold or the energy storage device is in a discharge state, determining whether the grid connection point is in a powered state; when the grid connection point is in a powered state, performing the grid connection operation on the system.

[0021] The present invention provides a new energy power supply system. When the external power grid is operating normally, the power generation device and the energy storage device can be connected to the grid connection point by sending a forced grid connection instruction to the system controller of the new energy power supply system to realize the power generation and energy storage function of the new energy power supply system. At the same time, the power load equipment obtains electric energy from the external power grid, so that the power load equipment obtains effective power supply. Conversely, when the external power grid loses power or is about to lose power, the power generation device and the energy storage device can be connected to the power load equipment by sending a forced off-grid instruction to the system controller of the new energy power supply system, and the power generation device and the energy storage device supply power to the power load equipment to ensure the power supply stability of the power load equipment. Furthermore, it is also possible to send an automatic mode instruction to the system controller of the new energy power supply system, so that the new energy power supply system determines whether to perform grid connection operation or off-grid operation on the new energy power supply system according to whether the external power grid loses power, so that the power supply stability of the power load equipment is guaranteed, thereby effectively improving the operation reliability of the new energy power supply system.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 A schematic diagram of the structure of a new energy power supply system provided by an embodiment of the present invention is shown;

[0025] Figure 2 A schematic diagram showing the structure of another new energy power supply system provided by an embodiment of the present invention

[0026] Figure 3 A circuit structure diagram of a knob switch provided by an embodiment of the present invention is shown;

[0027] Figure 4 A schematic diagram of a flow chart of a system controller provided by an embodiment of the present invention performing a grid-connected operation on a new energy power supply system is shown;

[0028] Figure 5 A schematic diagram of a process flow of a system controller provided by an embodiment of the present invention performing off-grid operation on a new energy power supply system is shown;

[0029] Figure 6 A schematic diagram of a flow chart of a system controller controlling the system to enter an automatic mode provided by an embodiment of the present invention is shown;

[0030] Figure 7 A schematic diagram of a flow chart of a system controller provided by an embodiment of the present invention controlling a new energy power supply system according to the power of an energy storage device is shown. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0032] In one embodiment, Figure 1As shown, a new energy power supply system is provided, which is used to supply power to an external power grid 800 through a grid connection point 700, and the new energy power supply system includes: an energy storage device 100, a power generation device 200, a system controller (not shown in the figure), a first switch 300, a second switch 400, and at least one power load device 500. Furthermore, a grid connection indicator light and an off-grid indicator light are provided at the system controller. When the new energy power supply system is in a system grid connection mode, the grid connection indicator light is on, and when the new energy power supply system is in a system off-grid mode, the off-grid indicator light is on.

[0033] Here, the system controller can be a computer device with certain computing capabilities; further, the energy storage device 100 and the power generation device 200 can each have a rectifier and inverter device, which can interact with the system based on AC power. At the same time, the energy storage device 100 and the power generation device 200 can each have a control device, which can adjust the working state under control. Further, the new energy power supply system can also be connected to other power load devices 600, such as power grid control equipment, etc., and the system can supply power to the power load devices 600. Further, the power generation device 200 can be a power generation device such as photovoltaic power generation equipment, wind power generation equipment, and hydropower generation equipment.

[0034] Specifically, the connection ends of the power interaction end of the energy storage device 100 and the power interaction end of the power generation device 200 are respectively connected to the first end of the first switch 300 and the first end of the second switch 400, the second end of the first switch 300 is connected to the grid connection point 700, and the second end of the second switch 400 is respectively connected to the power access end of the power load equipment 500 and the grid connection point 700.

[0035] Here, the power access end of the power load equipment 500 and the second end of the first switch 300 can be connected to the internal bus 900 in the system through a transformer respectively. Here, the voltage level of the internal bus 900 can be 10 kV; further, the internal bus 900 can be connected to the grid connection point through a transformer to connect the system to the external power grid 800.

[0036] As an example, Figure 1 There are two power load devices 500, one of which is connected to the internal bus 900 through the second transformer E2, and the other is connected to the internal bus 900 through the third transformer E3; further, the second end of the first switch 300 is connected to the internal bus 900 through the first transformer E1, and the internal bus 900 is connected to the grid connection point 700 through the fourth transformer E4 to connect the system to the external power grid 800. Further, the power access end of the power load device 600 can be connected to the second end of the first switch 300 to obtain power supply.

[0037] Here, the number of the power load devices 500 in the new energy power supply system can be determined according to actual conditions and is also applicable to this embodiment.

[0038] Further, the system controller is configured to perform the following processing:

[0039] First, a mode switching instruction is received, wherein the mode switching instruction includes a forced grid connection instruction, a forced off-grid instruction or an automatic mode instruction. Furthermore, the mode switching instruction can be issued by a remote host computer, and relevant staff can send the mode switching instruction to the system controller at the host computer according to actual conditions. For example, if the system is expected to be off-grid in a planned manner, a forced off-grid instruction can be sent to the system controller, and if the system is expected to be off-grid in an unplanned manner, an automatic mode instruction can be sent to the system controller.

[0040] Further, the system controller can be connected to the controlled ends of the first switch 300 and the second switch 400 respectively to control the on and off of the first switch 300 and the second switch 400. Further, the system controller can also be connected to the controlled end of the energy storage device 100 and the controlled end of the power generation device 200 respectively to obtain the power state of the energy storage device 100 and the power output state of the power generation device 200; further, the system controller can send a grid-connected enable signal, an off-grid enable signal and a power-on / off command to the energy storage device 100 to control the energy storage device 100 to enter the grid-connected mode and the off-grid mode, and control the power-on / off state of the energy storage device 100. Further, the system controller can be connected to an electric energy meter (not shown in the figure) set at the grid-connected point 700 to determine the power state of the grid-connected point 700 through the electric energy meter to determine whether the grid-connected point 700 is in a power-off state. Furthermore, the system controller may be connected to an electric energy meter provided at each electric load device 500 to determine the power status of the electric load device 500 to judge whether the power supply to the electric load device 500 is normal.

[0041] Furthermore, when the mode switching instruction is the forced grid-connected instruction, a grid-connected operation is performed on the system to turn on the first switch 300, turn off the second switch 400, connect the power generation device 200 and the energy storage device 100 to the grid-connected point 700, and enter the system grid-connected mode.

[0042] Specifically, when the system controller receives a forced grid connection instruction, it can determine whether the grid connection point 700 is out of power, and when the grid connection point 700 is not out of power, it sends a grid connection enable signal to the energy storage device 100 to enable the energy storage device 100 to enter the grid connection mode, and can control the first switch 300 to be turned on, and the second switch 400 to be turned off, so that the power generation device 200 and the energy storage device 100 are connected to the grid connection point 700. When the external power grid 800 is in a low power consumption valley, the energy storage device 100 obtains and stores electric energy from the external power grid 800, and when the external power grid 800 is in a peak power consumption valley, the energy storage device 100 provides electric energy to the external power grid 800 to perform peak load filling. At the same time, the external power grid 800 supplies power to the power load device 500 to ensure the power supply stability of the power load device 500.

[0043] Furthermore, when the mode switching instruction is the forced off-grid instruction, an off-grid operation is performed on the system to disconnect the first switch 300, turn on the second switch 400, connect the power generation device 100 and the energy storage device 200 to the power load equipment 500, and enter the system off-grid mode.

[0044] Specifically, when the system controller receives a forced off-grid instruction, it can send an off-grid enable signal to the energy storage device 100 to put the energy storage device 100 into an off-grid mode, and can control the first switch 300 to be disconnected, so that the second switch 400 is turned on, and the power generation device 200 and the energy storage device 100 are connected to the power load equipment 500 to jointly supply power to the power load equipment 500, thereby ensuring the power supply stability of the power load equipment 500. Here, when the power generation device 200 and the energy storage device 100 supply power to the electric load equipment 500, when there is any electric energy remaining after the power generation device 200 supplies power to the electric load equipment 500, the energy storage device 100 receives the remaining electric energy for charging; further, when the energy storage device 100 is fully charged, the power output of the power generation device 200 is controlled so that the electric energy output by the power generation device 200 is adapted to the electric energy consumption of the electric load equipment 500. At this time, the power generation device 200 can also be controlled to shut down to reduce the waste of electric energy; further, when the output electric energy of the power generation device 200 is insufficient, the energy storage device 100 discharges to provide electric power support to the electric load equipment 500, thereby ensuring the maximum utilization rate of the electric energy output of the power generation device 200.

[0045] Further, when the mode switching instruction is the automatic mode instruction, the system is controlled to enter the automatic mode to monitor the power status of the grid connection point 700 and the power load device 500, and based on the power status, the system performs the grid connection operation or the off-grid operation. The power status may include the power status of the grid connection point 700 and the power load device 500, and the power status includes the power-off state, the power-on state, and the power supply state.

[0046] Specifically, when the system controller receives the automatic mode instruction, it can monitor whether the grid connection point 700 loses power and monitor the power supply status of the power load device 500. When the grid connection point 700 does not lose power and the power supply status of the power load device 500 is normal, the system can be made to perform the grid connection operation to make the system enter the system grid connection mode. Conversely, when the grid connection point 700 loses power or the power supply status of the power load device 500 is abnormal, the system can be made to perform the off-grid operation to make the system enter the system off-grid mode.

[0047] The embodiment provides a new energy power supply system. When the external power grid is operating normally, the power generation device and the energy storage device can be connected to the grid connection point by sending a forced grid connection instruction to the system controller of the new energy power supply system to realize the power generation and energy storage function of the new energy power supply system. At the same time, the power load equipment obtains electric energy from the external power grid, so that the power load equipment obtains effective power supply. Conversely, when the external power grid loses power or is about to lose power, the power generation device and the energy storage device can be connected to the power load equipment by sending a forced off-grid instruction to the system controller of the new energy power supply system, and the power generation device and the energy storage device supply power to the power load equipment to ensure the power supply stability of the power load equipment. Furthermore, it is also possible to send an automatic mode instruction to the system controller of the new energy power supply system, so that the new energy power supply system determines whether to perform grid connection operation or off-grid operation on the new energy power supply system according to whether the external power grid loses power, so that the power supply stability of the power load equipment is guaranteed, thereby effectively improving the operation reliability of the new energy power supply system.

[0048] In an optional embodiment, if Figure 2 As shown, the system further includes at least one dual power switch S, and the dual power switch S corresponds to the power load device 500 one by one; further, the power access end of the power load device 500 is connected to the second end of the second switch 400 and the grid connection point 700 through the dual power switch S. Specifically, a dual power switch S can be set at the power access end of each power load device 500, and the controlled end of each dual power switch S is connected to the system controller (not shown in the figure), so that the system controller can control the conduction state of the dual power switch S.

[0049] Further, the system controller is also used to control the dual power switch S to connect the power access end of the power load device 500 to the second end of the second switch 400, or to connect the power access end of the power load device 500 to the grid connection point 700. Specifically, the power output end of the dual power switch S is connected to the power access end of the power load device 500, the first power input end of the dual power switch S is connected to the second end of the second switch 400, and the second power input end of the dual power switch S is connected to the grid connection point 700. The system controller can control the dual power switch S to connect the power output end to the first power input end or the second power input end.

[0050] In the embodiment provided by the present application, when the grid connection point is powered and the bus voltage is established by the energy storage device, the conduction state of the dual power supply switching switch is adjusted to connect the power load equipment to the grid connection point or the energy storage device. This can effectively avoid the power of the grid connection point and the power of the energy storage device being applied to the power load equipment together, avoid the voltages of the two from influencing each other, reduce the safety hazards of power supply to the power load equipment to a certain extent, and improve the reliability of power supply to the power load equipment.

[0051] In an optional embodiment, the system controller receives the mode switching instruction from a remote control device, the control device includes a knob switch having a grid-connected switch, an off-grid switch, and an emergency stop switch, the knob switch is used to make one of the grid-connected switch, the off-grid switch, and the emergency stop switch in a conducting state; wherein the control device may be a remote control panel. Further, the control device includes a knob switch having a grid-connected switch, an off-grid switch, and an emergency stop switch, specifically, the knob switch includes three knob positions, namely a grid-connected position, an off-grid position, and an emergency stop position, when the knob switch is rotated to the grid-connected position, the grid-connected switch is turned on, when the knob switch is rotated to the off-grid position, the off-grid switch is turned on, and when the knob switch is rotated to the emergency stop position, the emergency stop switch is turned on.

[0052] Specifically, the circuit structure diagram of the knob switch is as follows Figure 3As shown, the knob switch includes a grid-connected switch SB1, an off-grid switch SB2, and an emergency stop switch EP0. The first end of the grid-connected switch SB1 is connected to the grid-connected signal output terminal IN3 of the signal source for outputting the signal to access the grid-connected signal; the first end of the off-grid switch SB2 is connected to the off-grid signal output terminal IN5 of the signal source to access the grid-connected signal; the first end of the emergency stop switch EP0 is connected to the emergency stop signal output terminal IN4 of the signal source to access the emergency stop signal. The second end of the grid-connected switch SB1, the second end of the off-grid switch SB2, and the second end of the emergency stop switch EP0 are connected to the system controller. When the system controller receives the grid-connected signal, it can be determined that the grid-connected switch SB1 is turned on. When the system controller receives the off-grid signal, it can be determined that the off-grid switch SB2 is turned on. When the system controller receives the emergency stop signal, it can be determined that the emergency stop switch EP0 is turned on. In the above manner, one of the grid-connected switch SB1, the off-grid switch SB2, and the emergency stop switch EP0 can be turned on to avoid the system controller from simultaneously recognizing that more than two switches are turned on.

[0053] Furthermore, the system controller is further configured to perform the following processing:

[0054] First, the system controller determines whether the emergency stop switch is turned on. When the emergency stop switch is turned on, the energy storage device is controlled to shut down. When the emergency stop switch is turned off, it is determined whether the grid-connected switch is disconnected. Specifically, when the system controller determines that the emergency stop switch is turned on, it can control the energy storage device to shut down at zero power, and determine that the system is in an abnormal state, and perform a switching failure operation on the new energy power supply system. Among them, the system controller performs the switching failure operation by sending a shutdown instruction to the energy storage state to control the shutdown of the energy storage device, disconnecting the first switch and the second switch, and turning off the grid-connected indicator light and the off-grid indicator light at the same time. At the same time, an alarm prompt message can be sent to a remote host computer so that relevant staff can be informed of the abnormal state of the system in a timely manner at the host computer.

[0055] Furthermore, if the grid-connected switch is disconnected, the switching state of the off-grid switch is determined, and when the off-grid switch is turned on, the off-grid operation is performed on the system, and when the off-grid switch is disconnected, the system enters the automatic mode.

[0056] Furthermore, if the grid-connected switch is not disconnected, the switching state of the off-grid switch is determined, and when the off-grid switch is disconnected, it is determined whether the grid-connected point is in a power-off state, and when the grid-connected point is in a power-off state, the grid-connected operation is performed.

[0057] Furthermore, if the grid connection point is not in a power failure state, a switching failure operation is performed on the new energy power supply system.

[0058] In the embodiments provided by the present application, relevant staff can adjust the knob switch to make one of the grid-connected switch, the off-grid switch and the emergency stop switch conductive, so that the system controller can determine whether to make the new energy power supply system enter the system grid-connected mode, the system off-grid mode or the automatic mode according to the conductive conditions of the grid-connected switch, the off-grid switch and the emergency stop switch and whether the grid-connected point has lost power. The new energy power supply system can support both planned and unplanned off-grid operation and can adapt to multiple site environments, thereby improving the operability of the new energy power supply system and its adaptability to different site environments.

[0059] In an optional embodiment, if Figure 4 As shown, the system controller performs the grid-connected operation on the system in a manner including:

[0060] S401. The system controller determines whether the energy storage device is in a shutdown state.

[0061] S402: When the energy storage device is in a shutdown state, determine whether the first switch is in an on state.

[0062] In contrast, when the system controller confirms that the energy storage device is not in the shutdown state, a first preset operation is performed, wherein the first preset operation includes:

[0063] First, a shutdown instruction is sent to the energy storage device and the operating state of the energy storage device is monitored, and it is determined whether the energy storage device is shut down within a first preset waiting time. The shutdown instruction is used to put the energy storage device in a shutdown state, and the length of the first preset waiting time can be determined according to time conditions.

[0064] Further, when the energy storage device is shut down within the first preset waiting time, the step of determining whether the first switch is in the on state is performed.

[0065] Furthermore, when the energy storage device is not shut down within the first preset waiting time, the switching failure operation is performed on the system and an alarm prompt message is issued.

[0066] S403: When the first switch is in the on state, determine whether the second switch is in the off state.

[0067] In contrast, when the system controller determines that the first switch is not in the on state, a second preset operation is performed, wherein the second preset operation includes:

[0068] Sending a conduction instruction to the first switch and monitoring the on-off state of the first switch, and determining whether the first switch is on within a second preset waiting time. The conduction instruction is used to control the first switch to be in an on state, and the length of the second preset waiting time can be determined according to time conditions.

[0069] Further, when the first switch is turned on within the second preset waiting time, the step of confirming whether the second switch is in an off state is performed;

[0070] Furthermore, when the first switch is not turned on within the second preset waiting time, the switching failure operation is performed on the system and an alarm prompt message is issued.

[0071] S404: When the second switch is in an off state, a grid-connection instruction message is sent to the energy storage device.

[0072] Further, when the system controller confirms that the second switch is not in the disconnected state, a third preset operation is performed, wherein the third preset operation includes:

[0073] Send a disconnection instruction to the second switch and monitor the on / off state of the second switch, and determine whether the second switch is disconnected within a third preset waiting time. The disconnection instruction is used to control the second switch to be in an off state, and the length of the third preset waiting time can be determined according to time conditions.

[0074] Further, when the second switch is disconnected within a third preset waiting time, the step of sending grid connection instruction information to the energy storage device is performed.

[0075] Further, when the second switch is not disconnected within the third preset waiting time, the switching failure operation is performed on the system and an alarm prompt message is issued;

[0076] S405, determining whether the energy storage device is in the grid-connected mode after a preset grid-connected waiting time has passed; wherein the grid-connected instruction information may be a grid-connected enable signal for enabling the energy storage device to enter the grid-connected mode, and the length of the preset grid-connected waiting time may be determined based on actual conditions.

[0077] Here, when the system controller confirms that the energy storage device is not in the grid-connected mode after the preset grid-connected waiting time has passed, the switching failure operation is performed on the system and an alarm prompt message is issued.

[0078] S406, when the energy storage device is in the grid-connected mode, a grid-connected prompt message is sent, and the grid-connected indicator light is turned on, at which time the new energy power supply system enters the system grid-connected mode. Specifically, when the energy storage device is in the grid-connected mode, a grid-connected prompt message can be sent to the upper computer to inform relevant staff that the system and the energy storage device have entered the grid-connected mode.

[0079] The embodiment provided by the present application can confirm the status of the energy storage device, the first switch and the second switch and enable the energy storage device to enter the grid-connected mode, turn on the first switch and disconnect the second switch, so that the system enters the system grid-connected mode. Conversely, when the status of the energy storage device, the first switch and the second switch is abnormal, the switching failure process is entered, the switching failure operation is executed and an alarm prompt message is issued, thereby improving the reliability of the new energy power supply system.

[0080] In an optional embodiment, if Figure 5 As shown, the system controller performs the off-grid operation on the system in a manner including:

[0081] S501. The system controller determines whether the energy storage device is in a shutdown state.

[0082] S502: When the energy storage device is in a shutdown state, determine whether the first switch is in an open state.

[0083] In contrast, when the system controller confirms that the energy storage device is not in the shutdown state, a fourth preset operation is performed, wherein the fourth preset operation includes:

[0084] First, a shutdown instruction is sent to the energy storage device, the operating status of the energy storage device is monitored, and it is determined whether the energy storage device is shut down within a fourth preset waiting time; wherein the length of the fourth preset waiting time can be determined according to time conditions.

[0085] Further, when the energy storage device is shut down within the fourth preset waiting time, the step of confirming whether the first switch is in an open state is performed.

[0086] Furthermore, when the energy storage device is not shut down within the fourth preset waiting time, a switching failure operation is performed on the system and an alarm prompt message is issued.

[0087] S503: When the first switch is in an off state, determine whether the second switch is in an on state.

[0088] In contrast, when the system controller confirms that the first switch is not in the disconnected state, a fifth preset operation is performed, wherein the fifth preset operation includes:

[0089] First, a disconnection instruction is sent to the first switch, the on / off state of the first switch is monitored, and it is determined whether the first switch is disconnected within a fifth preset waiting time. The disconnection instruction is used to disconnect the first switch, and the length of the fifth preset waiting time can be determined according to time conditions.

[0090] Further, when the first switch is disconnected within a fifth preset waiting time, the step of determining whether the second switch is in the on state is performed.

[0091] Furthermore, when the first switch is not disconnected within a fifth preset waiting time, the switching failure operation is performed on the system and an alarm prompt message is issued.

[0092] S504: When the second switch is in the on state, send off-grid instruction information to the energy storage device; wherein the off-grid instruction information may be an off-grid enable signal for enabling the energy storage device to enter an off-grid mode.

[0093] In contrast, when the system controller determines that the second switch is not in the on state, a sixth preset operation is performed, wherein the sixth preset operation includes:

[0094] First, a conduction instruction is sent to the second switch and the on-off state of the second switch is monitored, and it is determined whether the second switch is turned on within a sixth preset waiting time; wherein the conduction instruction is used to turn on the second switch, and the length of the sixth preset waiting time can be determined according to time conditions.

[0095] Further, when the second switch is turned on within a sixth preset waiting time, the step of sending off-grid instruction information to the energy storage device is performed.

[0096] Furthermore, when the second switch is not turned on within a sixth preset waiting time, the switching failure operation is performed on the system and an alarm prompt message is issued.

[0097] S505: Determine whether the power status of the grid connection point is a power-off state after a preset off-grid waiting time has passed.

[0098] Here, when the power state of the grid connection point is a power failure state, the system controller performs the switching failure operation on the system and issues an alarm prompt message.

[0099] S506: When the power state of the grid connection point is not a power-off state, determine whether the energy storage device is in an off-grid mode.

[0100] Here, when the energy storage device is not in the off-grid mode, the system controller performs the switching failure operation on the system and issues an alarm prompt message.

[0101] S507: When the energy storage device is in the off-grid mode, determine that the system is in the off-grid mode, issue an off-grid prompt message, and light up the off-grid indicator light.

[0102] The embodiment provided by the present application can confirm the status of the energy storage device, the first switch and the second switch and enable the energy storage device to enter the off-grid mode, disconnect the first switch and turn on the second switch, so that the system enters the off-grid mode. Conversely, when the status of the energy storage device, the first switch and the second switch is abnormal, the switching failure process is entered, the switching failure operation is executed and an alarm prompt message is issued, thereby improving the reliability of the new energy power supply system.

[0103] In an optional embodiment, the power status includes the grid connection point voltage, such as Figure 6 As shown, the system controller controls the system to enter the automatic mode, including:

[0104] S601. Monitor whether the grid connection point voltage of the grid connection point is greater than the first preset voltage value; here, the system controller can determine the grid connection point voltage of the grid connection point by means of an electric energy meter arranged at the grid connection point. The value of the first preset voltage value can be determined according to actual conditions. When the grid connection point voltage is greater than the first preset voltage value, it can be determined that the grid connection point has not lost power.

[0105] S602: When the grid connection point voltage is greater than the first preset voltage value, determine whether at least one of the power load devices is in a power-off state and the energy storage device is in a powered state. Here, the system controller can determine whether the power supply access terminal of the power load device has a voltage exceeding the preset voltage value through an electric energy meter set at the power load device to determine whether the power load device is out of power, and can be connected to the controller of the energy storage device to determine whether the energy storage device stores electric energy to determine whether the energy storage device is powered.

[0106] S603: When at least one of the electric load devices is in a power-off state and the energy storage device is in a powered state, perform the grid-connected operation on the system.

[0107] S604. When the grid connection point voltage is less than the first preset voltage value, determine whether the grid connection point voltage is less than a second preset voltage value; wherein the value of the second preset voltage value can be determined according to actual conditions, and when the grid connection point voltage is less than the second preset voltage value, it can be determined that the grid connection point has lost power.

[0108] S605: When the grid connection point voltage is less than the second preset voltage value, determine whether at least one of the power load devices is in a power-off state.

[0109] S606. When at least one of the electric load devices is in a power-off state, perform the off-grid operation on the system.

[0110] In contrast, when the grid connection point voltage is not greater than the first preset voltage value and not less than the second preset voltage value, it can be determined that the system is abnormal, and the switching failure operation is performed on the system and an alarm prompt message is issued. Furthermore, when the grid connection point voltage is less than the second preset voltage value and all power load devices are not in a power-off state, it can also be determined that the system is abnormal, and the switching failure operation is performed on the system and an alarm prompt message is issued.

[0111] The embodiment provided in the present application can enable the system to enter automatic mode, and determine whether to enter system offline mode or system off-grid mode based on whether the grid connection point has lost power and whether the power load equipment has lost power, so that the system can adapt to the situation of unplanned grid disconnection and improve the reliability of the new energy power supply system.

[0112] In an optional embodiment, if Figure 7 As shown, the system controller is also configured to perform the following processing:

[0113] S701: When the first switch is turned off, the second switch is turned on, and the energy storage device is in the off-grid mode, monitor the power and discharge state of the energy storage device. The discharge state of the energy storage device includes a discharge state and a non-discharge state, and the power of the energy storage device can be the current remaining power of the energy storage device.

[0114] S702: When the power of the energy storage device is lower than a preset power threshold or the energy storage device is in a discharging state, determine whether the grid connection point is in a charged state; wherein the preset power threshold can be determined based on actual conditions.

[0115] S703: When the grid-connected point is in a powered state, perform a grid-connected operation on the system to obtain electric energy from the grid-connected point to charge the energy storage device.

[0116] Furthermore, when the power of the energy storage device exceeds a preset power threshold, the system can be operated off-grid so that the power load equipment obtains power from the energy storage device and the power generation device.

[0117] Furthermore, the system controller may also control the energy storage device to perform zero-power shutdown when determining that the power level of the energy storage device is lower than a preset power threshold.

[0118] The embodiment provided by the present application can adjust the grid-connected and off-grid states of the system and the energy storage device through the state of charge (SOC) of the energy storage device. When the SOC of the energy storage device is lower than a certain threshold, if there is electricity at the grid connection point, it switches to the grid-connected mode to charge the energy storage device, and when it is charged to a certain threshold, it switches to the off-grid mode to continue to supply power to the power load equipment. Here, if the configuration lower limit is not enabled, when the SOC of the energy storage device is lower than a certain threshold, the energy storage device is shut down, which significantly improves the operability of the system.

[0119] The present invention provides a new energy power supply system. When the external power grid is operating normally, the power generation device and the energy storage device can be connected to the grid connection point by sending a forced grid connection instruction to the system controller of the new energy power supply system. The power generation device generates electricity. When the load of the external power grid is high, the energy storage device transmits electric energy to the external power grid. When the load of the external power grid is low, the energy storage device obtains electric energy from the external power grid and stores energy for transmitting electric energy to the external power grid when the load of the external power grid is high, which plays a role in peak shaving and valley filling for the external power grid. At the same time, the power load equipment obtains electric energy from the external power grid, so that the power load equipment obtains effective power supply. Conversely, when the external power grid loses power, the power generation device and the energy storage device can be connected to the power load equipment by sending a forced off-grid instruction to the system controller of the new energy power supply system. The power generation device and the energy storage device supply power to the power load equipment. When the power load equipment cannot absorb the electric energy generated by the power generation device, the energy storage device stores the excess electric energy, and reduces the waste of electric energy on the premise of ensuring that the power load equipment obtains effective power supply. Furthermore, by sending an automatic mode instruction to the system controller of the new energy power supply system, the new energy power supply system can determine whether to connect to the grid or operate off the grid according to whether the external power grid has lost power, so as to ensure the power supply stability of the power load equipment, thereby effectively improving the operating reliability of the new energy power supply system.

[0120] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A new energy power supply system, characterized in that: The new energy power supply system comprises: an energy storage device, a power generation device, a system controller, a first switch, a second switch and at least one power load device; The connection ends of the power interaction end of the energy storage device connected to the power interaction end of the power generation device are respectively connected to the first end of the first switch and the first end of the second switch, the second end of the first switch is connected to the grid connection point, and the second end of the second switch is respectively connected to the power access end of the power load equipment and the grid connection point; The system controller is configured to perform the following processes: Receiving a mode switching instruction, wherein the mode switching instruction includes a forced grid connection instruction, a forced off-grid instruction, or an automatic mode instruction; When the mode switching instruction is the forced grid-connection instruction, performing a grid-connection operation on the system, so that the first switch is turned on, the second switch is turned off, and the power generation device and the energy storage device are connected to the grid-connection point; When the mode switching instruction is the forced off-grid instruction, an off-grid operation is performed on the system to disconnect the first switch, connect the second switch, and connect the power generation device and the energy storage device to the power load device; When the mode switching instruction is the automatic mode instruction, the system is controlled to enter the automatic mode to monitor the power status of the grid-connected point and the power load equipment, and based on the power status, the system performs the grid-connected operation or the off-grid operation.

2. The new energy power supply system according to claim 1, characterized in that: The system also includes a dual power supply switch; The power output end of the dual power switch is connected to the power access end of the power load device, the first power input end of the dual power switch is connected to the second end of the second switch, and the second power input end of the dual power switch is connected to the grid connection point; The system controller is also used to control the dual power supply switching switch to connect the power supply access end of the power load device to the second end of the second switch, or to connect the power supply access end of the power load device to the grid connection point.

3. The new energy power supply system according to claim 1, characterized in that: The system controller receives the mode switching instruction from a remote control device, wherein the control device includes a knob switch having a grid-connected switch, an off-grid switch, and an emergency stop switch, and the knob switch is used to put one of the grid-connected switch, the off-grid switch, and the emergency stop switch into a conducting state; The system controller is also configured to perform the following processing: Determine whether the emergency stop switch is turned on, and when the emergency stop switch is turned on, control the energy storage device to shut down, and when the emergency stop switch is turned off, determine whether the grid-connected switch is turned off; If the grid-connected switch is disconnected, determining the switch state of the off-grid switch, and when the off-grid switch is turned on, performing the off-grid operation on the system, and when the off-grid switch is disconnected, causing the system to enter the automatic mode; If the grid-connected switch is not disconnected, the switch state of the off-grid switch is determined. When the off-grid switch is disconnected, it is determined whether the power state of the grid-connected point is in a power-off state. When the grid-connected point is in a power-off state, the grid-connected operation is performed.

4. The new energy power supply system according to claim 1, characterized in that: The system controller is also used to perform a switching failure operation on the new energy power supply system; The system controller performs the switching failure operation on the new energy power supply system by controlling the energy storage device to shut down and disconnecting the first switch and the second switch.

5. The new energy power supply system according to claim 4, characterized in that: The manner in which the system controller performs the grid-connected operation on the system includes: The system controller determines whether the energy storage device is in a shutdown state; When the energy storage device is in a shutdown state, determining whether the first switch is in an on state; When the first switch is in an on state, determining whether the second switch is in an off state; When the second switch is in an off state, sending grid connection instruction information to the energy storage device; Determining whether the energy storage device is in a grid-connected mode after a preset grid-connected waiting time has passed; When the energy storage device is in a grid-connected mode, issuing a grid-connected prompt message; When the energy storage device is not in the grid-connected mode, the switching failure operation is performed on the new energy power supply system and an alarm prompt message is issued.

6. The new energy power supply system according to claim 5, characterized in that: When the system controller determines that the energy storage device is not in a shutdown state, a first preset operation is performed, wherein the first preset operation includes: Sending a shutdown instruction to the energy storage device and monitoring the operating state of the energy storage device, and determining whether the energy storage device is shut down within a first preset waiting time; when the energy storage device is shut down within the first preset waiting time, executing the step of determining whether the first switch is in a conducting state; when the energy storage device is not shut down within the first preset waiting time, executing the switching failure operation on the system and issuing an alarm prompt message; When the system controller determines that the first switch is not in the on state, performing a second preset operation, wherein the second preset operation includes: Sending a conduction instruction to the first switch and monitoring the on-off state of the first switch, and determining whether the first switch is turned on within a second preset waiting time; when the first switch is turned on within the second preset waiting time, executing the step of determining whether the second switch is in an off state; when the first switch is not turned on within the second preset waiting time, executing the switching failure operation on the system and issuing an alarm prompt message; When the system controller determines that the second switch is not in the disconnected state, a third preset operation is performed, wherein the third preset operation includes: Send a disconnection instruction to the second switch and monitor the on-off state of the second switch, and determine whether the second switch is disconnected within a third preset waiting time; when the second switch is disconnected within the third preset waiting time, execute the step of sending grid connection instruction information to the energy storage device; when the second switch is not disconnected within the third preset waiting time, execute the switching failure operation on the system and issue an alarm prompt information.

7. The new energy power supply system according to claim 4, characterized in that: The manner in which the system controller performs the off-grid operation on the system includes: The system controller determines whether the energy storage device is in a shutdown state; When the energy storage device is in a shutdown state, determining whether the first switch is in an open state; When the first switch is in an off state, determining whether the second switch is in an on state; When the second switch is in an on state, sending off-grid instruction information to the energy storage device; After a preset off-grid waiting time has passed, determining whether the power state of the grid connection point is a power-off state; When the power state of the grid connection point is not a power failure state, determining whether the energy storage device is in an off-grid mode; When the energy storage device is in an off-grid mode, issuing an off-grid prompt message; When the energy storage device is not in the off-grid mode, the switching failure operation is performed on the new energy power supply system and an alarm prompt message is issued.

8. The new energy power supply system according to claim 7, characterized in that: When the system controller determines that the energy storage device is not in a shutdown state, a fourth preset operation is performed, wherein the fourth preset operation includes: Sending a shutdown instruction to the energy storage device and monitoring the operating state of the energy storage device, and determining whether the energy storage device is shut down within a fourth preset waiting time; when the energy storage device is shut down within the fourth preset waiting time, executing the step of determining whether the first switch is in an off state; when the energy storage device is not shut down within the fourth preset waiting time, executing the switching failure operation on the system and issuing an alarm prompt message; When the system controller determines that the first switch is not in the disconnected state, a fifth preset operation is performed, wherein the fifth preset operation includes: Sending a disconnection instruction to the first switch and monitoring the on-off state of the first switch, and determining whether the first switch is disconnected within a fifth preset waiting time; when the first switch is disconnected within the fifth preset waiting time, executing the step of determining whether the second switch is in an on state; when the first switch is not disconnected within the fifth preset waiting time, executing the switching failure operation on the system and issuing an alarm prompt message; When the system controller determines that the second switch is not in the on state, a sixth preset operation is performed, wherein the sixth preset operation includes: A conduction instruction is sent to the second switch, the on-off state of the second switch is monitored, and it is determined whether the second switch is turned on within a sixth preset waiting time; when the second switch is turned on within the sixth preset waiting time, the step of sending off-grid instruction information to the energy storage device is performed; when the second switch is not turned on within the sixth preset waiting time, the switching failure operation is performed on the system and an alarm prompt message is issued.

9. The new energy power supply system according to claim 4, characterized in that: The system controller controls the system to enter an automatic mode, including: Monitoring whether the grid connection point voltage of the grid connection point is greater than a first preset voltage value; When the grid connection point voltage is greater than the first preset voltage value, determining whether at least one of the power load devices is in a power-off state and the energy storage device is in a powered state; When at least one of the electric load devices is in a power-off state and the energy storage device is in a powered state, performing the grid-connected operation on the system; When the grid connection point voltage is less than the first preset voltage value, determining whether the grid connection point voltage is less than a second preset voltage value; When the grid connection point voltage is less than the second preset voltage value, determining whether at least one of the electric load devices is in a power-off state; When at least one of the electric load devices is in a power-off state, performing the off-grid operation on the system; When the grid connection point voltage is not greater than the first preset voltage value and not less than the second preset voltage value, the switching failure operation is performed on the system and an alarm prompt message is issued.

10. The new energy power supply system according to claim 1, characterized in that: The system controller is also configured to perform the following processing: When the first switch is disconnected, the second switch is turned on, and the energy storage device is in the off-grid mode, monitoring the power and discharge state of the energy storage device; When the power of the energy storage device is lower than a preset power threshold or the energy storage device is in a discharging state, determining whether the grid connection point is in a charged state; When the grid connection point is in a powered state, the grid connection operation is performed on the system.

Images