Photovoltaic power system, control method and electric equipment

Abstract

The invention discloses a photovoltaic power system, a control method and electric equipment. The photovoltaic power system comprises a photovoltaic assembly, a photovoltaic relay and a photovoltaic converter which are arranged in sequence, a first voltage detection unit is arranged at the output end of the photovoltaic assembly and used for detecting the output voltage of the photovoltaic assembly, and the photovoltaic power system further comprises an energy storage device connected to the photovoltaic relay; the second voltage detection unit is used for detecting the output voltage of the energy storage device; and the controller is used for controlling whether the energy storage device and the photovoltaic relay are kept conducted or not according to the output voltage of the photovoltaic module and the output voltage of the energy storage device. According to the invention, when the output voltage of the photovoltaic module is relatively low, the photovoltaic relay is switched on through power supply of the energy storage device, so that repeated switching-on and switching-off of the photovoltaic relay caused by voltage fluctuation of the input side of the photovoltaic relay are avoided, the service life of the photovoltaic relay is prolonged, and the stability of a photovoltaic power system is improved.

Description

Technical Field

[0001] This invention relates to the field of electronic power technology, and more specifically, to a photovoltaic power system, control method, and electrical equipment. Background Technology

[0002] With the popularization of photovoltaic (PV) power generation technology, integrated PV-storage systems are widely used in distributed energy fields. Existing PV power systems typically use PV converters to boost the PV input voltage to 400V to meet load demands. In these systems, PV modules are connected to the PV converter via PV relays. If the natural light intensity is too low or the load suddenly increases, the output voltage of the PV modules will drop, causing the PV relays on the PV converter input side to turn off. Conversely, when the light intensity increases, the output voltage of the PV modules will rise again, turning on the PV relays on the PV converter input side. This fluctuation in PV module output voltage with changes in light intensity causes repeated switching of the PV relays on the PV converter input side, severely impacting system stability and lifespan.

[0003] There is currently no effective solution to the problem that the voltage output of photovoltaic modules in existing photovoltaic power systems fluctuates with changes in light intensity, causing repeated switching of photovoltaic relays on the input side of the photovoltaic converter, which seriously affects the system stability and lifespan. Summary of the Invention

[0004] This invention provides a photovoltaic power system, control method, and electrical equipment to solve the problem in the prior art where the voltage output of photovoltaic modules in photovoltaic power systems fluctuates with changes in light intensity, causing repeated switching of the photovoltaic relay on the input side of the photovoltaic converter, which seriously affects the system stability and lifespan.

[0005] To address the aforementioned technical problems, this invention provides a photovoltaic power system, comprising a photovoltaic module, a photovoltaic relay, and a photovoltaic converter arranged sequentially. The output terminal of the photovoltaic module is equipped with a first voltage detection unit for detecting the output voltage of the photovoltaic module. The photovoltaic power system further includes:

[0006] An energy storage device is connected to the photovoltaic relay;

[0007] The second voltage detection unit is used to detect the output voltage of the energy storage device;

[0008] The controller is used to control both the photovoltaic module and the energy storage device to be connected to the photovoltaic relay, and then controls whether the energy storage device and the photovoltaic relay remain connected based on the output voltage of the photovoltaic module and the output voltage of the energy storage device.

[0009] Furthermore, the photovoltaic power system also includes:

[0010] The first switch is located between the photovoltaic module and the photovoltaic relay.

[0011] Furthermore, the photovoltaic power system also includes:

[0012] A second switch is disposed between the energy storage device and the photovoltaic relay.

[0013] Furthermore, the photovoltaic power system also includes:

[0014] A boost circuit is disposed between the energy storage device and the photovoltaic relay.

[0015] Furthermore, the controller is specifically used for:

[0016] When the output voltage of the photovoltaic module is greater than or equal to the conduction voltage threshold of the photovoltaic relay, the photovoltaic module and the photovoltaic relay are connected, and the energy storage device and the photovoltaic relay are disconnected.

[0017] When the output voltage of the photovoltaic module is less than the conduction voltage threshold of the photovoltaic relay, it is determined whether the output voltage of the energy storage device is greater than or equal to the conduction voltage threshold of the photovoltaic relay. When the output voltage of the energy storage device is greater than or equal to the conduction voltage threshold of the photovoltaic relay, the photovoltaic module and the photovoltaic relay are controlled to conduct, and the energy storage device and the photovoltaic relay are controlled to remain connected.

[0018] The present invention also provides a control method applied to the above-mentioned photovoltaic power system, the control method comprising:

[0019] Both the photovoltaic module and the energy storage device are connected to the photovoltaic relay for conduction.

[0020] Obtain the output voltage of the photovoltaic module and the output voltage of the energy storage device;

[0021] The connection between the energy storage device and the photovoltaic relay is controlled based on the output voltage of the photovoltaic module and the output voltage of the energy storage device.

[0022] Further, controlling whether the energy storage device and the photovoltaic relay remain connected based on the output voltage of the photovoltaic module and the output voltage of the energy storage device includes:

[0023] Determine whether the output voltage of the photovoltaic module is greater than or equal to the on-state voltage threshold of the photovoltaic relay;

[0024] If so, control the photovoltaic module to maintain conduction with the photovoltaic relay, and control the energy storage device to disconnect from the photovoltaic relay;

[0025] If not, determine whether the output voltage of the energy storage device is greater than or equal to the conduction voltage threshold of the photovoltaic relay. If the determination result is yes, control the photovoltaic module and the photovoltaic relay to maintain conduction, and control the energy storage device and the photovoltaic relay to maintain conduction.

[0026] Furthermore, after determining whether the output voltage of the energy storage device is greater than or equal to the on-state voltage threshold of the photovoltaic relay, the control method further includes:

[0027] If the judgment result is negative, then the photovoltaic module is disconnected from the photovoltaic relay, and the energy storage device is disconnected from the photovoltaic relay, and then the energy storage device is replaced.

[0028] Furthermore, after controlling whether the energy storage device and the photovoltaic relay remain connected based on the output voltage of the photovoltaic module and the output voltage of the energy storage device, the control method further includes:

[0029] Determine whether the output voltage of the photovoltaic module is less than the start-up voltage threshold of the photovoltaic converter; wherein the start-up voltage threshold of the photovoltaic converter is lower than the conduction voltage threshold of the photovoltaic relay;

[0030] If so, then the photovoltaic module and the photovoltaic relay are disconnected, and the energy storage device and the photovoltaic relay are also disconnected.

[0031] The present invention also provides an electrical device, including the photovoltaic power system described above.

[0032] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the above-described anomaly detection method.

[0033] The present invention also provides an electronic device, comprising:

[0034] One or more processors;

[0035] A storage device for storing one or more programs, which, when executed by one or more processors, cause the one or more processors to implement the above-described anomaly detection method.

[0036] By applying the technical solution of this invention, an energy storage device is connected to the input side of a photovoltaic relay. When the input voltage on the photovoltaic side is lower than the conduction threshold of the photovoltaic relay due to low light intensity or other reasons, the energy storage device is controlled to connect to the input side of the photovoltaic relay, raising the voltage on the input side of the photovoltaic relay. The output voltage of the photovoltaic module and the output voltage of the energy storage device are used as detection targets. The switching on and off of the energy storage device is controlled based on the output voltage of the photovoltaic module and the output voltage of the energy storage device. This ensures that when the output voltage of the photovoltaic module is low and the output voltage of the energy storage device meets the conduction condition of the photovoltaic relay, the energy storage device is continuously connected to the photovoltaic relay, keeping the photovoltaic relay continuously conducting. This avoids the problem of repeated switching on and off of the photovoltaic relay caused by voltage fluctuations on the input side of the photovoltaic relay, leading to abnormal load start-up and shutdown and rapid degradation of the photovoltaic relay's lifespan, thus improving the stability and reliability of the photovoltaic power system. Compared to existing solutions that only detect the output voltage of photovoltaic modules, which leads to "information blind spots" and misjudgments when the output voltage of photovoltaic modules fluctuates, this embodiment pioneers a "dual-source voltage parallel sampling architecture" that incorporates the output voltage of the energy storage device into the control logic. This eliminates the problem of missing decision data at the source, upgrades the energy storage device from an "additional component" to a "core decision-making component," and achieves "photovoltaic-energy storage" collaborative sensing. This enables dynamic switching of the power supply to the photovoltaic relay based on the output voltage of both devices. Attached Figure Description

[0037] Figure 1 This is a structural diagram of a photovoltaic power system in the prior art;

[0038] Figure 2 A structural diagram of a photovoltaic power system according to the present invention;

[0039] Figure 3 A flowchart of a control method according to an embodiment of the present invention;

[0040] Figure 4 A flowchart of a control method according to another embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention.

[0042] Reference numerals: 1: Photovoltaic module, 2: Photovoltaic relay, 3: Photovoltaic converter, 4: First voltage detection unit, 5: Load, 6: Energy storage device, 7: Second voltage detection unit, 8: Controller, 9: Boost circuit, S1: First switch, S2: Second switch. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0044] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0045] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0046] It should be understood that although the terms "first," "second," etc., may be used to describe switches in the embodiments of the present invention, these switches should not be limited to these terms. These terms are only used to distinguish switches located in different positions. For example, without departing from the scope of the embodiments of the present invention, a first switch may also be referred to as a second switch, and similarly, a second switch may also be referred to as a first switch.

[0047] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0048] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0049] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0050] Example 1

[0051] With the popularization of photovoltaic (PV) power generation technology, integrated PV-storage systems are widely used in distributed energy fields. Existing PV power systems typically use PV converters to boost the PV input voltage to 400V to meet load demands. In these systems, PV modules are connected to the PV converter via PV relays. If the natural light intensity is too low or the load suddenly increases, the output voltage of the PV modules will drop, causing the PV relays on the PV converter input side to turn off. Conversely, when the light intensity increases, the output voltage of the PV modules will rise again, turning on the PV relays on the PV converter input side. This fluctuation in PV module output voltage with changes in light intensity causes repeated switching of the PV relays on the PV converter input side, severely impacting system stability and lifespan.

[0052] To address the problem in existing photovoltaic power systems where the output voltage of photovoltaic modules fluctuates with changes in light intensity, causing repeated switching of the photovoltaic relay on the input side of the photovoltaic converter and severely affecting system stability and lifespan, this embodiment provides a photovoltaic power system. Figure 2 A structural diagram of a photovoltaic power system according to the present invention is shown below. Figure 2 As shown, the photovoltaic power system includes a photovoltaic module 1, a photovoltaic relay 2, and a photovoltaic converter 3 arranged in sequence. The output terminal of the photovoltaic module 1 is equipped with a first voltage detection unit 4 for detecting the output voltage E of the photovoltaic module. The output terminal of the photovoltaic converter is connected to a load 5. The photovoltaic power system also includes: an energy storage device 6 connected to the photovoltaic relay 2; a second voltage detection unit 7 for detecting the output voltage Vbat of the energy storage device; and a controller 8 for controlling both the photovoltaic module 1 and the energy storage device 6 to be connected to the photovoltaic relay 2, and then controlling whether the energy storage device 6 and the photovoltaic relay 2 remain connected based on the output voltage E of the photovoltaic module and the output voltage of the energy storage device.

[0053] In this embodiment of the photovoltaic power system, an energy storage device is connected to the input side of the photovoltaic relay. When the input voltage on the photovoltaic side is lower than the conduction threshold of the photovoltaic relay due to low light intensity or other reasons, the energy storage device is controlled to connect to the input side of the photovoltaic relay, raising the voltage on the input side of the photovoltaic relay. The output voltage E of the photovoltaic module and the output voltage Vbat of the energy storage device are used as detection targets. The on / off state of the energy storage device is controlled based on the output voltage E of the photovoltaic module and the output voltage Vbat of the energy storage device. This ensures that when the output voltage E of the photovoltaic module is low and the output voltage Vbat of the energy storage device meets the conduction condition of the photovoltaic relay, the energy storage device is continuously connected to the photovoltaic relay, keeping the photovoltaic relay continuously conducting. This avoids the problem of repeated on / off switching of the photovoltaic relay due to voltage fluctuations on the input side of the photovoltaic relay, which leads to abnormal load start / stop and rapid degradation of the photovoltaic relay's lifespan, thus improving the stability and reliability of the photovoltaic power system. Compared to existing solutions that only detect the output voltage E of photovoltaic modules, which leads to "information blind spots" and misjudgments when the output voltage E of photovoltaic modules fluctuates, this embodiment pioneers a "dual-source voltage parallel sampling architecture" that incorporates the output voltage Vbat of the energy storage device into the control logic. This eliminates the problem of missing decision data at the source, upgrades the energy storage device from an "additional component" to a "core decision-making component," and achieves "photovoltaic-energy storage" collaborative sensing. This enables dynamic switching of the power supply to the photovoltaic relay based on the output voltages of both devices.

[0054] In order to control the on / off connection between the photovoltaic module and the photovoltaic relay, the photovoltaic power system also includes: a first switch S1, which is disposed between the photovoltaic module and the photovoltaic relay.

[0055] In order to control the on / off connection between the photovoltaic module and the photovoltaic relay, the above-mentioned photovoltaic power system also includes: a second switch S2, which is set between the energy storage device and the photovoltaic relay.

[0056] When the energy storage device has a low power level, resulting in a low output voltage, the photovoltaic relay cannot be kept on. To ensure the photovoltaic relay remains on even when the energy storage device's output voltage Vbat is low, the aforementioned photovoltaic power system also includes a boost circuit 9, located between the energy storage device 6 and the photovoltaic relay 2. When the energy storage device's output voltage Vbat is low, the photovoltaic converter boosts the battery voltage to the starting voltage required by the photovoltaic relay, maintaining the photovoltaic relay's on-time.

[0057] To accurately control the connection and disconnection of the energy storage device, when the output voltage E of the photovoltaic module is low, the photovoltaic relay 2 is kept on to avoid frequent switching of the photovoltaic relay 2. Specifically, the controller 8 is used to: control the photovoltaic module 1 and the photovoltaic relay 2 to conduct when the output voltage E of the photovoltaic module is greater than or equal to the conduction voltage threshold of the photovoltaic relay, and control the energy storage device 6 and the photovoltaic relay 2 to disconnect, that is, control the first switch S1 to conduct, and at the same time control the second switch S2 to turn off; when the output voltage E of the photovoltaic module is less than the conduction voltage threshold of the photovoltaic relay, determine whether the output voltage Vbat of the energy storage device is greater than or equal to the conduction voltage threshold V0 of the photovoltaic relay. When the output voltage Vbat of the energy storage device is greater than or equal to the conduction voltage threshold V0 of the photovoltaic relay, control the photovoltaic module 1 and the photovoltaic relay 2 to conduct, and control the energy storage device 6 and the photovoltaic relay 2 to remain on, that is, control both the first switch S1 and the second switch S2 to conduct.

[0058] To avoid malfunctions during system voltage fluctuations or insufficient sunlight, and to ensure stable system voltage at higher levels, the on-state voltage threshold V0 of the photovoltaic relay must be higher than the startup voltage threshold Vdc of the photovoltaic converter. However, this would cause the photovoltaic module 1 to disconnect from the system during low sunlight. In other words, the condition that the on-state voltage threshold V0 of the photovoltaic relay is greater than the startup voltage threshold of the photovoltaic converter is considered an "inevitable cost," which would lead to a waste of some photovoltaic energy. In this embodiment, the output voltage E of the photovoltaic module is less than the on-state voltage threshold V0 of the photovoltaic relay as the trigger condition for the intervention of the energy storage device 6, thus creatively transforming the "problem point" into a "decision point." The breakthrough lies in the fact that it no longer compromises on the contradiction of setting the cut-off threshold of photovoltaic module 1. Instead, when the output voltage E of the photovoltaic module is lower than the conduction voltage threshold V0 of the photovoltaic relay, the energy storage device 6 acts as a "voltage substitute source" to keep the photovoltaic relay 2 conducting. This allows the photovoltaic power system to continue operating even when the output voltage E of the photovoltaic module is less than the conduction voltage threshold V0 of the photovoltaic relay. This ensures that the electrical energy output by photovoltaic module 1 can still be utilized when its output voltage is low. Furthermore, when the output voltage E of the photovoltaic module fails, the energy storage device 6 outputs the required voltage, seamlessly taking over the photovoltaic relay 2. Existing solutions completely abandon photovoltaic power when the output voltage E of the photovoltaic module is less than the conduction voltage threshold V0 of the photovoltaic relay. This embodiment elevates the energy storage device 6 from a "backup power source" to a "decision-making unit," enabling the photovoltaic power system to be powered by the energy storage device 6 when the output voltage E of the photovoltaic module is less than the conduction voltage threshold V0 of the photovoltaic relay, preserving the operational possibility of the photovoltaic converter. This creatively achieves dynamic optimization of "photovoltaic-energy storage hybrid power supply." Another key aspect of this embodiment is that by setting the output voltage Vbat of the energy storage device to be greater than or equal to the conduction voltage threshold V0 of the photovoltaic relay, the reliability of the output of the energy storage device 6 is ensured, rather than simply relying on the operation of the energy storage device 6.

[0059] If the energy storage device 6 has insufficient power and its output voltage is low, it will not be able to maintain the conduction state of the photovoltaic relay 2. In order to ensure that the energy storage device 6 can play the role of maintaining the conduction of the photovoltaic relay 2 when the output voltage E of the photovoltaic module is low, the energy storage device 6 needs to maintain a certain amount of power. The controller is also used to: control the photovoltaic module 1 to disconnect from the photovoltaic relay 2 when the output voltage Vbat of the energy storage device is less than the conduction voltage threshold V0 of the photovoltaic relay, and control the energy storage device 6 to disconnect from the photovoltaic relay 2.

[0060] Example 2

[0061] This embodiment provides a control method applied to the photovoltaic power system described in the above embodiment. Figure 3 A flowchart of a control method according to an embodiment of the present invention is shown below. Figure 3 As shown, the control method includes:

[0062] S101 controls both the photovoltaic module and the energy storage device to be connected to the photovoltaic relay.

[0063] S102, obtain the output voltage E of the photovoltaic module and the output voltage Vbat of the energy storage device.

[0064] S103 controls whether the energy storage device and the photovoltaic relay remain connected based on the output voltage E of the photovoltaic module and the output voltage Vbat of the energy storage device.

[0065] The control method in this embodiment uses the output voltage E of the photovoltaic module and the output voltage Vbat of the energy storage device as the detection targets. It controls the on / off state of the energy storage device based on these two voltages. When the output voltage E of the photovoltaic module is low, and the output voltage Vbat of the energy storage device meets the conduction conditions of the photovoltaic relay, the energy storage device is continuously connected to the photovoltaic relay, ensuring continuous conduction. This avoids repeated on / off switching of the photovoltaic relay due to voltage fluctuations on its input side, which can lead to abnormal load start / stop and rapid degradation of the photovoltaic relay's lifespan, thus improving the stability and reliability of the photovoltaic power system. Compared to existing solutions that only detect the output voltage E of the photovoltaic module, resulting in an "information blind spot" and misjudgment when the output voltage E fluctuates, this embodiment pioneers a "dual-source voltage parallel sampling architecture," incorporating the output voltage Vbat of the energy storage device into the main control logic. This eliminates the problem of missing decision data at its source, upgrading the energy storage device from an "additional component" to a "core decision-making component," achieving collaborative sensing between photovoltaic and energy storage, and enabling dynamic switching of the photovoltaic relay's power supply based on the output voltages of both.

[0066] To accurately control the connection and disconnection of the energy storage device, when the output voltage E of the photovoltaic module is low, the photovoltaic relay is kept on to avoid frequent switching of the photovoltaic relay. The connection between the energy storage device and the photovoltaic relay is controlled based on the output voltage E of the photovoltaic module and the output voltage Vbat of the energy storage device. This includes: determining whether the output voltage E of the photovoltaic module is greater than or equal to the on-state voltage threshold V0 of the photovoltaic relay; if yes, the connection between the photovoltaic module and the photovoltaic relay is maintained, and the connection between the energy storage device and the photovoltaic relay is maintained, i.e., the first switch S1 is turned on and the second switch S2 is turned off; if no, it is determined whether the output voltage Vbat of the energy storage device is greater than or equal to the on-state voltage threshold V0 of the photovoltaic relay; if the determination result is yes, the connection between the photovoltaic module and the photovoltaic relay is maintained, and the connection between the energy storage device and the photovoltaic relay is maintained, i.e., both the first switch S1 and the second switch S2 are turned on.

[0067] To avoid malfunctions during system voltage fluctuations or insufficient sunlight, and to ensure stable and higher system voltage levels, the on-state voltage threshold V0 of the photovoltaic relay must be higher than the startup voltage threshold of the photovoltaic converter. However, this can lead to the photovoltaic modules shutting off from the system during low sunlight. In other words, the condition that the on-state voltage threshold V0 of the photovoltaic relay is greater than the startup voltage threshold of the photovoltaic converter is considered an "inevitable cost," which results in the waste of some photovoltaic energy. This embodiment creatively transforms the "problem point" into a "decision point" by using the output voltage E of the photovoltaic module being less than the on-state voltage threshold V0 of the photovoltaic relay as the trigger condition for the intervention of the energy storage device. The breakthrough lies in no longer compromising with the contradiction of the photovoltaic relay's on-voltage threshold setting. Instead, when the output voltage E of the photovoltaic module is lower than the photovoltaic relay's on-voltage threshold V0, the energy storage device acts as a "voltage substitute source" to keep the photovoltaic relay conducting. This allows the photovoltaic power system to continue operating even when the photovoltaic module's output voltage E < the photovoltaic relay's on-voltage threshold V0, ensuring that the electrical energy output by the photovoltaic module can still be utilized when the output voltage E of the photovoltaic module fails. This allows the energy storage device to output the required voltage and seamlessly take over from the photovoltaic relay when the photovoltaic module's output voltage E fails. Existing solutions completely abandon photovoltaics when the photovoltaic module's output voltage E < the photovoltaic relay's on-voltage threshold V0. This embodiment elevates the energy storage device from a "backup power source" to a "decision-making unit," enabling the photovoltaic power system to supply power through the energy storage device when the photovoltaic module's output voltage E < the photovoltaic relay's on-voltage threshold V0, preserving the operational possibility of the photovoltaic converter. This creatively achieves dynamic optimization of "photovoltaic-energy storage hybrid power supply." Another key aspect of this embodiment is that by setting the output voltage Vbat of the energy storage device to be greater than or equal to the on-state voltage threshold V0 of the photovoltaic relay, the reliability of the energy storage device's output is ensured, rather than simply relying on the operation of the energy storage device.

[0068] If the energy storage device has insufficient power and the output voltage is low, it will not be able to maintain the conduction state of the photovoltaic relay. In order to ensure that the energy storage device can play the role of maintaining the conduction of the photovoltaic relay when the output voltage E of the photovoltaic module is low, the energy storage device needs to maintain a certain amount of power. After determining whether the output voltage Vbat of the energy storage device is greater than or equal to the conduction voltage threshold V0 of the photovoltaic relay, the above control method also includes: if the determination result is negative, then controlling the photovoltaic module to disconnect from the photovoltaic relay, and controlling the energy storage device to disconnect from the photovoltaic relay, and then replacing the energy storage device.

[0069] If the output voltage E of the photovoltaic module is less than the start-up voltage threshold Vdc of the photovoltaic converter, it indicates that the irradiance conditions are too poor, and the output voltage E of the photovoltaic module is indeed too low, making it unnecessary to utilize the photovoltaic energy. In this case, it is not necessary to maintain the conduction of the photovoltaic relay. Therefore, after controlling whether the energy storage device and the photovoltaic relay remain connected based on the output voltage E of the photovoltaic module and the output voltage Vbat of the energy storage device, the above control method further includes: determining whether the output voltage E of the photovoltaic module is less than the start-up voltage threshold Vdc of the photovoltaic converter; wherein, the start-up voltage threshold Vdc of the photovoltaic converter is lower than the conduction voltage threshold V0 of the photovoltaic relay; if so, then the photovoltaic module and the photovoltaic relay are disconnected, and the energy storage device and the photovoltaic relay are also disconnected.

[0070] In this embodiment, the on-voltage threshold V0 of the photovoltaic relay can be set to 95V, and the start-up voltage threshold Vdc of the photovoltaic converter can be set to 90V.

[0071] Example 3

[0072] This embodiment provides another control method applied to the photovoltaic power system described in the above embodiment. Figure 4 A flowchart of a control method according to another embodiment of the present invention is shown below. Figure 4 As shown, the control method includes:

[0073] S41 controls the startup of the photovoltaic power system and controls the closing of the first switch S1 and the second switch S2.

[0074] S42 simultaneously detects the output voltage E of the photovoltaic module and the output voltage Vbat of the energy storage device through the voltage detection unit.

[0075] S43, determine whether the output voltage E of the photovoltaic module is greater than or equal to the photovoltaic relay conduction voltage threshold V0; if yes, proceed to step S44; if no, proceed to step S45.

[0076] S44: Control the first switch S1 to remain closed and control the second switch S2 to open, so that the photovoltaic module is connected to the photovoltaic relay and the energy storage device enters standby mode. Then execute step S48.

[0077] S45, determine whether the output voltage Vbat of the energy storage device is greater than or equal to the photovoltaic relay conduction voltage threshold V0; if yes, proceed to step S47; if no, proceed to step S46.

[0078] S46, control the first switch S1 and the second switch S2 to be disconnected, replace the energy storage device, and then return to step S41.

[0079] The output voltage Vbat of the energy storage device is lower than the photovoltaic relay start-up voltage threshold V0. Considering that the energy storage battery voltage is too low and does not meet the start-up voltage of the boost circuit, the energy storage battery BT1 needs to be replaced.

[0080] S47 controls both the first switch S1 and the second switch S2 to remain closed.

[0081] To avoid malfunctions during system voltage fluctuations or insufficient sunlight, and to ensure stable system voltage at higher levels, the on-state voltage threshold V0 of the photovoltaic relay must be higher than the startup voltage threshold Vdc of the photovoltaic converter. However, this would cause the photovoltaic modules to disconnect from the system during low sunlight. In other words, the condition that the on-state voltage threshold V0 of the photovoltaic relay is greater than the startup voltage threshold Vdc of the photovoltaic converter is considered an "inevitable cost," which would lead to a waste of some photovoltaic energy. This embodiment creatively transforms the "problem point" into a "decision point" by using the output voltage E of the photovoltaic module being less than the on-state voltage threshold V0 of the photovoltaic relay as the trigger condition for the intervention of the energy storage device. The breakthrough lies in no longer compromising on the contradiction of setting the cut-off threshold of photovoltaic modules. Instead, when the output voltage E of the photovoltaic module is lower than the conduction voltage threshold V0 of the photovoltaic relay, the energy storage device acts as a "voltage substitute source" to keep the photovoltaic relay conducting. This allows the photovoltaic power system to continue operating even when the output voltage E of the photovoltaic module is less than the conduction voltage threshold V0 of the photovoltaic relay. This ensures that the electrical energy output by the photovoltaic module can still be utilized when the output voltage E of the photovoltaic module fails, allowing the energy storage device to output the required voltage and seamlessly take over from the photovoltaic relay. Existing solutions completely abandon photovoltaics when the output voltage E of the photovoltaic module is less than the conduction voltage threshold V0 of the photovoltaic relay. This embodiment elevates the energy storage device from a "backup power source" to a "decision-making unit," enabling the photovoltaic power system to supply power through the energy storage device when the output voltage E of the photovoltaic module is less than the conduction voltage threshold V0 of the photovoltaic relay, preserving the operational possibility of the photovoltaic converter. This creatively achieves dynamic optimization of "photovoltaic-energy storage hybrid power supply." Another key aspect of this embodiment is that by setting the output voltage Vbat of the energy storage device to be greater than or equal to the on-state voltage threshold V0 of the photovoltaic relay, the reliability of the energy storage device's output is ensured, rather than simply relying on the operation of the energy storage device.

[0082] S48, determine whether the output voltage E of the photovoltaic module is greater than or equal to the photovoltaic converter start-up voltage threshold Vdc; if yes, proceed to step S9; if no, proceed to step S10.

[0083] S49, keep the first switch S1 and the second switch S2 closed. Then return to step S41.

[0084] S410: Both the first switch S1 and the second switch S2 are disconnected, putting the photovoltaic power system into standby mode. Then return to step S41.

[0085] If the output voltage E of the photovoltaic module is less than the start-up voltage threshold Vdc of the photovoltaic converter, it indicates that the lighting conditions are too poor, and the output voltage E of the photovoltaic module is indeed too low, making it unnecessary to utilize the photovoltaic energy. In this case, it is not necessary to maintain the conduction of the photovoltaic relay. Therefore, after controlling whether the energy storage device and the photovoltaic relay are kept on based on the output voltage E of the photovoltaic module and the output voltage Vbat of the energy storage device, it is also necessary to determine whether the output voltage E of the photovoltaic module is less than the start-up voltage threshold Vdc of the photovoltaic converter; where the start-up voltage threshold Vdc of the photovoltaic converter is lower than the conduction voltage threshold V0 of the photovoltaic relay; if so, the photovoltaic module and the photovoltaic relay are disconnected, and the energy storage device and the photovoltaic relay are also disconnected.

[0086] Example 4

[0087] This embodiment provides an electrical device, including the photovoltaic power system described in the above embodiment, used to control the energy storage device to continuously connect to the photovoltaic relay when the output voltage E of the photovoltaic module is low and the output voltage Vbat of the energy storage device meets the conduction conditions of the photovoltaic relay, so that the photovoltaic relay is continuously conducting. This avoids the problem of repeated switching of the photovoltaic relay caused by voltage fluctuations on the input side of the photovoltaic relay, which leads to abnormal load start-up and shutdown and rapid degradation of the photovoltaic relay's lifespan, thereby improving the stability and reliability of the photovoltaic power system.

[0088] Example 5

[0089] This embodiment provides a computer-readable storage medium storing a computer program thereon, characterized in that the program, when executed by a processor, implements the control method described in the above embodiment.

[0090] Example 6

[0091] This embodiment provides an electronic device, including:

[0092] One or more processors;

[0093] A storage device for storing one or more programs, which, when executed by one or more processors, cause the one or more processors to implement the above-described anomaly detection method.

[0094] Figure 5 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention, such as... Figure 5 As shown, the electronic device includes:

[0095] One or more processors 510 and memory 520, Figure 5 Take the 510 processor as an example.

[0096] The aforementioned electronic device may further include: an input device 530 and an output device 540.

[0097] The processor 510, memory 520, input device 530, and output device 540 can be connected via a bus or other means. Figure 5 Taking the example of a connection between China and Israel via a bus.

[0098] The memory 520, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the anomaly detection method in this embodiment of the invention. The processor 510 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions, and modules stored in the memory 520, thereby implementing the above-described method embodiments.

[0099] The memory 520 may include a program storage area and a data storage area, wherein the program storage area may store application programs required for operating the device and at least one function; and the data storage area may store data created based on the use of the anomaly detection device, etc. Furthermore, the memory 520 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0100] Input device 530 can receive input digital or character information, and generate key signal inputs related to user settings and function control of the electronic device. Output device 540 may include display devices such as a display screen.

[0101] The one or more modules are stored in the memory 520, and when executed by the one or more processors 510, they execute the anomaly detection method in any of the above method embodiments.

[0102] The aforementioned electronic device product can execute the method provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. Technical details not described in detail in this embodiment can be found in the method provided in the embodiments of the present invention.

[0103] The electronic devices of this invention exist in various forms, including but not limited to:

[0104] (1) Mobile communication devices: These devices are characterized by their mobile communication capabilities and are primarily designed to provide voice and data communication. These terminals include smartphones (e.g., iPhones), multimedia phones, feature phones, and low-end phones.

[0105] (2) Ultra-mobile personal computer devices: These devices fall under the category of personal computers, have computing and processing functions, and generally also have mobile internet access capabilities. These terminals include: PDAs, MIDs, and UMPCs, such as iPads.

[0106] (3) Portable entertainment devices: These devices can display and play multimedia content. This category includes: audio and video players (such as iPods), handheld game consoles, e-books, as well as smart toys and portable car navigation devices.

[0107] (4) Server: A device that provides computing services. The components of a server include a processor, hard disk, memory, device bus, etc. Servers are similar to general computer architectures, but because they need to provide highly reliable services, they have higher requirements in terms of processing power, stability, reliability, security, scalability, and manageability.

[0108] (5) Other electronic devices with data interaction functions, such as televisions, in-vehicle screens, etc.

[0109] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0110] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photovoltaic power system, comprising a photovoltaic module, a photovoltaic relay, and a photovoltaic converter arranged sequentially, wherein a first voltage detection unit is provided at the output terminal of the photovoltaic module for detecting the output voltage of the photovoltaic module, characterized in that, The photovoltaic power system also includes: An energy storage device is connected to the photovoltaic relay; The second voltage detection unit is used to detect the output voltage of the energy storage device; The controller is used to control both the photovoltaic module and the energy storage device to be connected to the photovoltaic relay, and then controls whether the energy storage device and the photovoltaic relay remain connected based on the output voltage of the photovoltaic module and the output voltage of the energy storage device.

2. The photovoltaic power system of claim 1, wherein, The photovoltaic power system also includes: The first switch is located between the photovoltaic module and the photovoltaic relay.

3. The photovoltaic power system of claim 1, wherein, The photovoltaic power system also includes: A second switch is disposed between the energy storage device and the photovoltaic relay.

4. The photovoltaic power system of claim 1, wherein, The photovoltaic power system also includes: A boost circuit is disposed between the energy storage device and the photovoltaic relay.

5. The photovoltaic power system of claim 1, wherein, The controller is specifically used for: When the output voltage of the photovoltaic module is greater than or equal to the conduction voltage threshold of the photovoltaic relay, the photovoltaic module and the photovoltaic relay are connected, and the energy storage device and the photovoltaic relay are disconnected. When the output voltage of the photovoltaic module is less than the conduction voltage threshold of the photovoltaic relay, it is determined whether the output voltage of the energy storage device is greater than or equal to the conduction voltage threshold of the photovoltaic relay. When the output voltage of the energy storage device is greater than or equal to the conduction voltage threshold of the photovoltaic relay, the photovoltaic module and the photovoltaic relay are controlled to conduct, and the energy storage device and the photovoltaic relay are controlled to remain connected.

6. A control method applied to the photovoltaic power system of any one of claims 1 to 5, characterized in that, The control method includes: Both the photovoltaic module and the energy storage device are connected to the photovoltaic relay for conduction. Obtain the output voltage of the photovoltaic module and the output voltage of the energy storage device; The connection between the energy storage device and the photovoltaic relay is controlled based on the output voltage of the photovoltaic module and the output voltage of the energy storage device.

7. The control method according to claim 6, characterized by Controlling whether the energy storage device and the photovoltaic relay remain connected based on the output voltage of the photovoltaic module and the output voltage of the energy storage device includes: Determine whether the output voltage of the photovoltaic module is greater than or equal to the on-state voltage threshold of the photovoltaic relay; If so, control the photovoltaic module to maintain conduction with the photovoltaic relay, and control the energy storage device to disconnect from the photovoltaic relay; If not, determine whether the output voltage of the energy storage device is greater than or equal to the conduction voltage threshold of the photovoltaic relay. If the determination result is yes, control the photovoltaic module and the photovoltaic relay to maintain conduction, and control the energy storage device and the photovoltaic relay to maintain conduction.

8. The control method according to claim 7, characterized by, After determining whether the output voltage of the energy storage device is greater than or equal to the on-state voltage threshold of the photovoltaic relay, the control method further includes: If the judgment result is negative, then the photovoltaic module is disconnected from the photovoltaic relay, and the energy storage device is disconnected from the photovoltaic relay, and then the energy storage device is replaced.

9. The control method according to claim 7, characterized by, After controlling whether the energy storage device and the photovoltaic relay remain connected based on the output voltage of the photovoltaic module and the output voltage of the energy storage device, the control method further includes: Determine whether the output voltage of the photovoltaic module is less than the start-up voltage threshold of the photovoltaic converter; wherein the start-up voltage threshold of the photovoltaic converter is lower than the conduction voltage threshold of the photovoltaic relay; If so, then the photovoltaic module and the photovoltaic relay are disconnected, and the energy storage device and the photovoltaic relay are also disconnected.

10. An electric device, characterized by The photovoltaic power system included in any one of claims 1 to 5.

11. A computer readable storage medium having stored thereon a computer program, characterized in that, When the program is executed by the processor, it implements the control method as described in any one of claims 6 to 9.

12. An electronic device, comprising: include: One or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, cause the one or more processors to implement the control method as described in any one of claims 6 to 9.

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