Power supply system safety detection method, device and power supply system

Abstract

The present application discloses a safety detection method, device and power supply system for a power supply system, and belongs to the field of power supply technology. The method comprises: when the power supply device is off-grid, disturbing the output voltage of the power supply device, obtaining the disturbance voltage signal of the power supply device and the grid-side voltage signal of the power distribution cabinet; based on the disturbance voltage signal and the grid-side voltage signal, determining the working state of the bypass module. By disturbing the output voltage of the power supply device when the power supply device is off-grid, obtaining the disturbance voltage signal and the grid-side voltage signal, and judging the working state of the bypass module, the method can accurately detect the state of the bypass module, reduce safety regulations and electric shock risks, and ensure the stability of the off-grid operation of the power supply device.

Description

Technical Field

[0001] The present application belongs to the field of power supply technology, and in particular, relates to a safety detection method, device and power supply system for a power supply system. Background Art

[0002] In order to ensure the continuity of load power supply, a bypass switch is often designed in the power distribution cabinet of the power supply system. When the bypass switch is closed, the power grid can supply power to the load. The bypass switch increases the safety risk of the system. After the bypass switch is mistakenly closed, if the power supply equipment works in off-grid mode, the voltage may be output outside the power distribution cabinet, causing safety and electric shock risks.

[0003] At present, the state of the bypass switch is judged by the feedback contact of the bypass switch, but the circuit design of the feedback contact is complicated and prone to misjudgment. How to accurately detect the state of the bypass switch and reduce safety regulations and electric shock risks is a technical problem that needs to be solved in this field. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a safety detection method, device and power supply system for a power supply system, which can accurately detect the state of a bypass module and effectively reduce safety regulations and electric shock risks.

[0005] In a first aspect, the present application provides a safety detection method for a power supply system, wherein the power supply system comprises a power supply device and a distribution cabinet, wherein the output side of the power supply device is connected to one end of a distribution line in the distribution cabinet, and the other end of the distribution line is connected to a power grid, and a bypass module is connected in parallel to the distribution line, and the bypass module is used to bypass the distribution line, and the method comprises:

[0006] When the power supply device is off-grid, disturb the output voltage of the power supply device to obtain a disturbance voltage signal of the power supply device and a grid-side voltage signal of the power distribution cabinet;

[0007] Based on the disturbance voltage signal and the grid-side voltage signal, the working state of the bypass module is determined.

[0008] According to the safety detection method of the power supply system of the present application, by disturbing the output voltage of the power supply equipment when the power supply equipment is operating off-grid, obtaining the disturbance voltage signal and the grid-side voltage signal, and judging the working status of the bypass module, the bypass module status can be accurately detected, reducing safety regulations and electric shock risks, and ensuring the stability of the off-grid operation of the power supply equipment.

[0009] According to an embodiment of the present application, determining the working state of the bypass module based on the disturbance voltage signal and the grid-side voltage signal includes:

[0010] Determine a first voltage difference across the bypass module after a voltage disturbance based on the disturbance voltage signal and the grid-side voltage signal;

[0011] Based on the comparison between the first voltage difference value and the target voltage difference threshold, the working state of the bypass module is determined according to the comparison result.

[0012] According to an embodiment of the present application, the comparing the first voltage difference value with the target voltage difference threshold value and determining the working state of the bypass module according to the comparison result includes:

[0013] When the first voltage difference is less than the target voltage difference threshold, determining that the bypass module is in a bypass state, and the bypass module bypasses the power distribution line;

[0014] Alternatively, when the first voltage difference is greater than or equal to the target voltage difference threshold, it is determined that the bypass module is in a disconnected state.

[0015] According to an embodiment of the present application, determining the working state of the bypass module based on the disturbance voltage signal and the grid-side voltage signal includes:

[0016] Determining whether the grid-side voltage signal changes with the disturbance voltage signal;

[0017] If the grid-side voltage signal changes with the disturbance voltage signal, it is determined that the bypass module is in the bypass state and the bypass module bypasses the distribution line; if the grid-side voltage signal does not change with the disturbance voltage signal, it is determined that the bypass module is in the disconnected state.

[0018] According to an embodiment of the present application, before disturbing the output voltage of the power supply device, the method further includes:

[0019] Acquire a second voltage difference across the bypass module;

[0020] The disturbing the output voltage of the power supply device comprises:

[0021] When it is determined that the bypass module is in the bypass state based on the second voltage difference, the output voltage of the power supply device is disturbed.

[0022] According to an embodiment of the present application, after obtaining the second voltage difference across the bypass module, the method further includes:

[0023] When it is determined based on the second voltage difference that the bypass module is in the disconnected state, the output voltage of the power supply device is not disturbed.

[0024] According to an embodiment of the present application, obtaining a second voltage difference across the bypass module includes:

[0025] When it is determined that a fault occurs in the power grid, the second voltage difference value is obtained.

[0026] According to an embodiment of the present application, the disturbing the output voltage of the power supply device includes:

[0027] At least one of the amplitude, frequency and phase of the output voltage of the power supply device is disturbed.

[0028] In a second aspect, the present application provides a safety detection device for a power supply system, the power supply system comprising a power supply device and a distribution cabinet, the output side of the power supply device is connected to one end of a distribution line in the distribution cabinet, the other end of the distribution line is connected to a power grid, the distribution line is connected in parallel with a bypass module, the bypass module is used to bypass the distribution line, and the device comprises:

[0029] An acquisition module, used to disturb the output voltage of the power supply device when the power supply device is off-grid, and obtain the disturbance voltage signal of the power supply device and the grid-side voltage signal of the power distribution cabinet;

[0030] A processing module is used to determine the working state of the bypass module based on the disturbance voltage signal and the grid-side voltage signal.

[0031] According to the safety detection device of the power supply system of the present application, by disturbing the output voltage of the power supply equipment when the power supply equipment is operating off-grid, obtaining the disturbance voltage signal and the grid-side voltage signal, and judging the working status of the bypass module, the bypass module status can be accurately detected, the safety regulations and electric shock risks can be reduced, and the stability of the off-grid operation of the power supply equipment can be ensured.

[0032] In a third aspect, the present application provides a power supply system, including:

[0033] Power supply equipment;

[0034] A power distribution cabinet, wherein the power distribution cabinet is provided with a power distribution line, the output side of the power supply device is connected to one end of the power distribution line, the other end of the power distribution line is connected to the power grid, and the power distribution line is connected in parallel with a bypass module, and the bypass module is used to bypass the power distribution line;

[0035] As in the safety detection device of the power supply system described in the second aspect above, the safety detection device is used to detect the working state of the bypass module.

[0036] According to an embodiment of the present application, the power supply device is used to stop output when the safety detection device determines that the bypass module is in a bypass state.

[0037] According to one embodiment of the present application, a power supply side switch is provided on the distribution line near the power supply equipment, and the power distribution cabinet is used to disconnect the power supply side switch when the safety detection device determines that the bypass module is in a bypass state.

[0038] In a fourth aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the power supply system safety detection method as described in the first aspect above is implemented.

[0039] In a fifth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the power supply system safety detection method as described in the first aspect above is implemented.

[0040] In a sixth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the power supply system safety detection method as described in the first aspect above.

[0041] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] Figure 1 It is a flowchart of a safety detection method for a power supply system provided in an embodiment of the present application;

[0044] Figure 2 is a schematic diagram of the structure of the power supply system provided in an embodiment of the present application;

[0045] Figure 3 It is a waveform diagram of phase disturbance of the power supply device provided in the embodiment of the present application;

[0046] Figure 4 This is one of the waveform diagrams of the frequency disturbance of the power supply equipment provided in the embodiment of the present application;

[0047] Figure 5 This is the second waveform diagram of the frequency disturbance of the power supply equipment provided in the embodiment of the present application;

[0048] Figure 6 It is a waveform diagram of voltage amplitude disturbance performed by the power supply device provided in the embodiment of the present application;

[0049] Figure 7 It is one of the load power schematic diagrams provided in the embodiment of the present application;

[0050] Figure 8 yes Figure 7 Schematic diagram of frequency change corresponding to medium load power;

[0051] Fig. 9 This is the second load power schematic diagram provided in the embodiment of the present application;

[0052] Fig.10 yes Fig. 9 Schematic diagram of voltage amplitude change corresponding to load power;

[0053] Fig.11 This is one of the flowcharts of the power supply system performing safety detection provided in the embodiment of the present application;

[0054] Fig.12 This is the second flowchart of the power supply system safety detection provided in the embodiment of the present application;

[0055] Fig.13 This is the third flow chart of the safety detection of the power supply system provided in the embodiment of the present application;

[0056] Fig.14 It is a structural schematic diagram of a safety detection device for a power supply system provided in an embodiment of the present application;

[0057] Fig.15 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0058] Reference numerals:

[0059] Power supply equipment 210 , power distribution cabinet 220 , power supply side switch 221 , grid side switch 222 , load side switch 223 , bypass module 224 , load 230 , grid 240 . DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0061] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0062] In the following, in combination with the accompanying drawings, the safety detection method of the power supply system, the safety detection device of the power supply system, the power supply system, the electronic device and the readable storage medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0063] In the embodiment of the present application, the power supply system may include a power supply device 210 and a power distribution cabinet 220 .

[0064] The power supply device 210 is a device that can perform AC-DC conversion and voltage conversion on input electrical energy, such as an inverter, a converter, etc.

[0065] The power distribution cabinet 220 can monitor the power parameters such as current, voltage, power, frequency, etc. in real time, and realize the reasonable distribution of electric energy through different devices such as switches, circuit breakers, contactors and fuses.

[0066] The power distribution cabinet 220 may be provided with a power distribution line, the output side of the power supply device 210 is connected to one end of the power distribution line, and the other end of the power distribution line is connected to the power grid 240 .

[0067] like Figure 2 As shown, the load 230 powered by the power supply system can also be connected to the distribution line. The distribution cabinet 220 distributes the electric energy output by the power supply device 210 and the electric energy of the power grid 240 to the load 230 through the distribution line so that the load 230 can operate.

[0068] It should be noted that the distribution line is connected in parallel with the bypass module 224, and the bypass module 224 is used to bypass the distribution line.

[0069] The bypass module 224 refers to an electrical device that can implement a bypass function, such as a contactor, a mechanical switch, and the like.

[0070] When the bypass module 224 is in the bypass state, the electrical connection between the power supply system and the grid 240 is conducted, and the grid 240 can supply power to the load 230. When the bypass module 224 is in the disconnected state, the electrical connection between the power supply system and the grid 240 is disconnected.

[0071] It is understandable that when the bypass module 224 is in the bypass state or the grid-side switch 222 is in the sticking state, the power supply device 210 operates in an off-grid mode and may output voltage outside the distribution cabinet 220, causing safety and electric shock risks.

[0072] The embodiment of the present application provides a safety detection method for a power supply system, which can accurately detect the status of a bypass module and reduce safety regulations and electric shock risks.

[0073] The safety detection method for the power supply system may be applied to the power supply system, and may be specifically executed by hardware or software in the power supply system.

[0074] like Figure 1 As shown, the safety detection method of the power supply system includes: step 110 and step 120.

[0075] Step 110 , when the power supply device 210 is off-grid, the output voltage of the power supply device 210 is disturbed to obtain a disturbance voltage signal of the power supply device 210 and a grid-side voltage signal of the power distribution cabinet 220 .

[0076] It is understandable that the power supply device 210 operates off-grid, that is, the power supply device 210 works in an off-grid mode, at which time the power supply device 210 operates without being connected to the power grid 240 , and the power supply device 210 independently supplies power to the load 230 .

[0077] In this embodiment, disturbing the output voltage of the power supply device 210 refers to introducing a periodic or non-periodic change in the output voltage of the power supply device 210 , and the change may be an adjustment of at least one of the voltage amplitude, frequency and phase.

[0078] The disturbance voltage signal refers to the output voltage signal of the power supply device 210 when the disturbance occurs, and can be obtained through the power supply device 210 or a metering device at the side where the power supply device 210 is located.

[0079] It can be understood that the grid-side voltage signal of the power distribution cabinet 220 refers to the voltage signal on the side where the grid 240 is located when the disturbance occurs, and can be obtained through the metering equipment on the side where the grid 240 is located.

[0080] In this step, when the power supply device 210 is operating off-grid, the output voltage of the power supply device 210 is disturbed to obtain a disturbance voltage signal on the power supply device 210 side and a grid-side voltage signal on the grid 240 side.

[0081] Step 120: Determine the working state of the bypass module 224 based on the disturbance voltage signal and the grid-side voltage signal.

[0082] It can be understood that the output voltage of the power supply device 210 is disturbed, and periodic or non-periodic changes are introduced in the output voltage of the power supply device 210. If the bypass module 224 is in the bypass state, the voltage signals on the power supply device 210 side and the power grid 240 side are matched. If the bypass module 224 is in the disconnected state, the voltage signals on the power supply device 210 side and the power grid 240 side are not matched.

[0083] In this step, according to the disturbance voltage signal on the power supply device 210 side and the grid-side voltage signal on the grid 240 side, it can be accurately determined whether the bypass module 224 is in the bypass state or the disconnected state.

[0084] In the related art, the voltage on both sides of the bypass switch is detected and the voltage difference on both sides of the bypass switch is calculated to determine whether the bypass switch is closed. When the voltage difference on both sides is less than a certain threshold (for example, 0), it can be determined that the bypass switch is closed. However, the sampling time and sampling error of the voltage at both ends are different. The difference may be less than the threshold, and the actual bypass switch may be disconnected, which is prone to misjudgment.

[0085] Some related technologies judge the state of the bypass switch through the feedback contacts of the bypass switch. The feedback contacts are set in the cabinet, and the circuit design is complicated, which increases the difficulty of construction. In addition, in field applications, the feedback contacts may fail, which is prone to misjudgment and increases the probability of false alarms.

[0086] In an embodiment of the present application, when the power supply device 210 is operating off-grid, the output voltage of the power supply device 210 is disturbed, periodic or non-periodic changes are introduced in the output voltage of the power supply device 210, and a disturbance voltage signal and a grid-side voltage signal are obtained. According to the disturbance voltage signal and the grid-side voltage signal, the working state of the bypass module 224 can be judged more accurately than the method of judging by sampling voltage. There is no need to design feedback contacts in the distribution cabinet 220, thereby reducing the construction difficulty. For the distribution cabinet 220 with feedback contacts, even if the feedback contacts fail, the working state of the bypass module 224 can be accurately judged, thereby effectively reducing safety regulations and electric shock risks.

[0087] According to the safety detection method of the power supply system provided in the embodiment of the present application, by disturbing the output voltage of the power supply device 210 when the power supply device 210 is off-grid, obtaining the disturbance voltage signal and the grid-side voltage signal, and judging the working state of the bypass module 224, the state of the bypass module 224 can be accurately detected, thereby reducing safety regulations and electric shock risks and ensuring the stability of the off-grid operation of the power supply device 210.

[0088] In some embodiments, disturbing the output voltage of the power supply device 210 includes:

[0089] At least one of the amplitude, frequency and phase of the output voltage of the power supply device 210 is disturbed.

[0090] In actual implementation, periodic or non-periodic changes are introduced to the output voltage of the power supply device 210, which can be an adjustment of at least one of the amplitude, frequency and phase of the voltage, that is, the amplitude, frequency or phase can be adjusted individually, or a combination of two or three of the amplitude, frequency and phase can be adjusted.

[0091] For example, Figure 3 FIG. 2 is a waveform diagram of a phase disturbance performed by the power supply device 210. Figure 3 As shown, a phase change is introduced into the output voltage of the power supply device 210, 0-t1 represents the time of one cycle of the output voltage, t1-t2 represents the time of one cycle of the output voltage, the ordinate is the voltage V, and the abscissa is the time t.

[0092] In this embodiment, V(n) represents the waveform of the output voltage of the power supply device 210 when no phase disturbance is performed, and V(P) represents the waveform of the output voltage of the power supply device 210 when phase disturbance is performed, and the phase of V(P) changes compared to V(n).

[0093] For another example, Figure 4 and Figure 5 FIG. 2 is a schematic diagram of a waveform of a frequency disturbance performed by the power supply device 210, such as Figure 4 As shown, a frequency change is introduced into the output voltage of the power supply device 210, 0-t1 represents the time of one cycle of the output voltage, t1-t2 represents the time of one cycle of the output voltage, the ordinate is the frequency f (Hertz, Hz), and the abscissa is the time t.

[0094] Wherein, f2=50 Hz, f2 is the power frequency of the power supply device 210, f1=50.1 Hz, and f3=49.9 Hz.

[0095] like Figure 5 As shown, V(n) represents the waveform of the output voltage of the power supply device 210 when there is no frequency disturbance, and V(f) represents the waveform of the output voltage of the power supply device 210 when there is frequency disturbance. The frequency of V(f) changes compared to V(n), and the waveform changes significantly.

[0096] For another example, Figure 6 FIG. 2 is a schematic diagram of a waveform of a voltage amplitude disturbance performed by the power supply device 210, such as Figure 6 As shown, an amplitude change is introduced into the output voltage of the power supply device 210, 0-t1 represents the time of one cycle of the output voltage, t1-t2 represents the time of one cycle of the output voltage, the ordinate is the voltage V, and the abscissa is the time t.

[0097] In this embodiment, V(n) represents the waveform of the output voltage of the power supply device 210 when no amplitude disturbance is performed, and V(A) represents the waveform of the output voltage of the power supply device 210 when amplitude disturbance is performed. The amplitude of V(A) changes compared to V(n), and the waveform changes significantly.

[0098] It is understandable that the disturbances in amplitude, frequency and phase may be limited within a certain range to prevent the output voltage disturbance of the power supply device 210 from affecting the normal operation of the load 230 .

[0099] In an embodiment of the present application, when the power supply device 210 is operating off-grid, at least one of the amplitude, frequency and phase of the output voltage of the power supply device 210 can be disturbed to obtain a disturbance voltage signal and a grid-side voltage signal to accurately determine the working status of the bypass module 224.

[0100] The following describes the embodiments of the present application in detail from two different implementation perspectives.

[0101] 1. Calculate the voltage difference based on the disturbance voltage signal and the grid-side voltage signal to determine the working state of the bypass module 224.

[0102] In some embodiments, step 120, determining the working state of the bypass module 224 based on the disturbance voltage signal and the grid-side voltage signal, may include:

[0103] Determine a first voltage difference across the bypass module 224 after the voltage disturbance based on the disturbance voltage signal and the grid-side voltage signal;

[0104] The first voltage difference is compared with the target voltage difference threshold, and the working state of the bypass module 224 is determined according to the comparison result.

[0105] It is understandable that the two ends of the bypass module 224 are respectively connected to the power supply device 210 and the power grid 240 , and the potentials at the two ends of the bypass module 224 are respectively the potential of the power supply device 210 and the potential of the power grid 240 .

[0106] In this embodiment, the potential on one side of the power supply device 210 can be calculated based on the disturbance voltage signal, and the potential on one side of the power grid 240 can be calculated based on the grid side voltage signal. Based on the potential on one side of the power supply device 210 and the potential on one side of the power grid 240, the first voltage difference across the bypass module 224 is calculated.

[0107] The target voltage difference threshold is a voltage difference critical value used to determine whether the bypass module 224 is in the bypass state.

[0108] It can be understood that when the bypass module 224 is in the bypass state, both ends of the bypass module 224 are connected, and the voltage difference between the two ends of the bypass module 224 is small.

[0109] In actual implementation, the target pressure difference threshold may be a smaller pressure difference value, for example, the target pressure difference threshold may be 0 or a decimal close to 0.

[0110] It should be noted that the two voltage sampling values ​​of the disturbance voltage signal and the grid-side voltage signal can be transformed, for example, by effective value, average value, sliding window average, etc., to improve the measurement accuracy, which helps to more accurately judge the working status of the bypass module 224.

[0111] In this embodiment, the output voltage of the power supply device 210 is disturbed, the disturbance voltage signal and the grid-side voltage signal are obtained, and the first voltage difference across the bypass module 224 is calculated. Compared with the related art of directly detecting the voltage difference across the bypass switch, the disturbance operation can reduce the impact of voltage sampling, fluctuations, etc., prevent the probability of misjudgment, and effectively reduce safety regulations and electric shock risks.

[0112] In some embodiments, based on the comparison between the first voltage difference and the target voltage difference threshold, determining the working state of the bypass module 224 according to the comparison result may include:

[0113] When the first voltage difference is less than the target voltage difference threshold, it is determined that the bypass module 224 is in the bypass state, and the bypass module 224 bypasses the power distribution line.

[0114] In this embodiment, when the first voltage difference is less than the target voltage difference threshold, it is determined that the bypass module 224 is in the bypass state. At this time, the distribution line of the distribution cabinet 220 is bypassed by the bypass module 224, and the electrical connection between the power supply equipment 210 and the power grid 240 is turned on. At this time, it is necessary to disconnect the electrical connection between the power supply equipment 210 and the power grid 240 (the power supply equipment 210 stops outputting or disconnects the power supply side switch 221) to prevent the off-grid power supply equipment 210 and the power grid 240 from affecting each other, thereby ensuring the stability of the power supply system's power supply to the load 230.

[0115] In some embodiments, based on the comparison between the first voltage difference and the target voltage difference threshold, determining the working state of the bypass module 224 according to the comparison result may include:

[0116] When the first voltage difference is greater than or equal to the target voltage difference threshold, it is determined that the bypass module 224 is in the disconnected state.

[0117] In this embodiment, when the first voltage difference is greater than or equal to the target voltage difference threshold, it is determined that the bypass module 224 is in a disconnected state, the electrical connection between the power supply device 210 and the power grid 240 is disconnected, and the power supply device 210 can maintain off-grid operation and supply power to the load 230.

[0118] 2. According to the disturbance voltage signal and the grid-side voltage signal, detect whether they follow each other and judge the working state of the bypass module 224.

[0119] In some embodiments, step 120, determining the working state of the bypass module 224 based on the disturbance voltage signal and the grid-side voltage signal, may include:

[0120] Determine whether the grid-side voltage signal changes with the disturbance voltage signal;

[0121] If the grid-side voltage signal changes with the disturbance voltage signal, it is determined that the bypass module 224 is in the bypass state, and the bypass module 224 bypasses the distribution line;

[0122] If the grid-side voltage signal does not change with the disturbance voltage signal, it is determined that the bypass module 224 is in the disconnected state.

[0123] It should be noted that when the power supply equipment 210 is operating off-grid, at least one of the amplitude, frequency and phase of the output voltage of the power supply equipment 210 is disturbed according to a preset disturbance law. When the grid-side voltage signal follows the change of the disturbance voltage signal, that is, the grid-side voltage signal and the disturbance voltage signal conform to the same disturbance law, it is judged that the bypass module 224 is in the bypass state.

[0124] It is understandable that when the grid-side voltage signal does not follow the change of the disturbance voltage signal, that is, the change law of the grid-side voltage signal is different from the disturbance law of the disturbance voltage signal, it is determined that the bypass module 224 is in the disconnected state.

[0125] In this embodiment, when the power supply device 210 is operating off-grid, the output voltage of the power supply device 210 is disturbed, and at least one of the amplitude, frequency and phase can be adjusted according to a preset disturbance law, or the amplitude and / or frequency can be adjusted according to a functional relationship presented by the power of the load 230.

[0126] For example, the preset disturbance rule is that the frequency output by the power supply device 210 is adjusted in the sequence of 49.9 Hz, 50.0 Hz, 50.1 Hz, 50.0 Hz, and 49.9 Hz.

[0127] For the disturbance voltage signal, the frequency output by the power supply device 210 is adjusted from 49.9 Hz to 50.0 Hz within the first 20 ms, the frequency output by the power supply device 210 is adjusted from 50.0 Hz to 50.1 Hz within the second 20 ms, the frequency output by the power supply device 210 is adjusted from 50.1 Hz to 50.0 Hz within the third 20 ms, and the frequency output by the power supply device 210 is adjusted from 50.0 Hz to 49.9 Hz within the fourth 20 ms.

[0128] In this embodiment, it is determined whether the frequency corresponding to the grid-side voltage signal follows the change of the disturbance voltage signal, and whether it presents a change pattern of 49.9Hz, 50.0Hz, 50.1Hz, 50.0Hz, and 49.9Hz. When the grid-side voltage signal presents the same change pattern, it indicates that the grid-side voltage signal follows the change of the disturbance voltage signal. When the grid-side voltage signal presents a different change pattern, it indicates that the grid-side voltage signal does not follow the change of the disturbance voltage signal.

[0129] For example, Figure 7 As shown, during the period t1-t4, the power P(load) of the load 230 first decreases and then increases, as shown in FIG. Figure 8 As shown, according to the disturbance voltage signal, the frequency of the output voltage of the power supply device 210 shows a rule of first increasing and then decreasing in the time period t1-t4.

[0130] In this embodiment, it is determined whether the frequency corresponding to the grid-side voltage signal in the time period t1-t4 shows a pattern of first increasing and then decreasing. When the grid-side voltage signal shows the same changing pattern, it indicates that the grid-side voltage signal follows the change of the disturbance voltage signal. When the grid-side voltage signal shows a different changing pattern, it indicates that the grid-side voltage signal does not follow the change of the disturbance voltage signal.

[0131] For example, Fig. 9 As shown, during the period of 0-t1, the power P(load) of the load 230 decreases, and during the period of t2-t3, the power P(load) of the load 230 increases, as shown in FIG. Fig.10 As shown, according to the disturbance voltage signal, in the period of 0-t1, the amplitude of the output voltage of the power supply device 210 increases, and in the period of t2-t3, the amplitude of the output voltage of the power supply device 210 decreases.

[0132] Wherein, V(n) represents the waveform of the output voltage of the power supply device 210 when no amplitude disturbance is performed, and V(A) represents the waveform of the output voltage of the power supply device 210 when the amplitude disturbance is performed.

[0133] In this embodiment, based on the grid-side voltage signal, it is determined whether the voltage amplitude in the time period 0-t1 increases, and it is determined whether the voltage amplitude in the time period t2-t3 decreases. When the grid-side voltage signal presents the same changing pattern, it indicates that the grid-side voltage signal follows the change of the disturbance voltage signal. When the grid-side voltage signal presents a different changing pattern, it indicates that the grid-side voltage signal does not follow the change of the disturbance voltage signal.

[0134] It is understandable that the output voltage of the power supply device 210 can be periodically disturbed to determine the number of times the grid-side voltage signal follows the changes in the disturbance voltage signal. When the number of times the grid-side voltage signal follows the changes in the disturbance voltage signal reaches a preset threshold, it is determined that the bypass module 224 is in the bypass state.

[0135] A specific embodiment is described below.

[0136] like Fig.11 As shown, at least one of the frequency, amplitude and phase of the output voltage of the power supply device 210 is periodically controlled to point A, and a feedback signal, that is, a grid-side voltage signal, is obtained in real time.

[0137] Determine whether the feedback signal tracks to point A. If the feedback signal tracks to point A, count N is accumulated. If the feedback signal does not track to point A, count N is cleared, decremented or reset to zero (N≥0).

[0138] It is determined whether N exceeds a threshold (threshold ≥ 1). If N exceeds the threshold, it indicates that the bypass module 224 is actually closed.

[0139] It should be noted that judging whether the grid-side voltage signal follows the change of the disturbance voltage signal takes less time than calculating the first voltage difference, which can effectively reduce the exposure time of safety risks.

[0140] It is understandable that disturbing the output voltage of the power supply device 210 may have a certain impact on the off-grid operation of the power supply device 210. Before disturbing the output voltage of the power supply device 210, it is possible to determine whether the bypass module 224 is at risk of being in a bypass state, and then perform a disturbance operation to reduce the impact on the off-grid operation of the power supply device 210 and ensure the stability of power supply to the load 230.

[0141] In some embodiments, before disturbing the output voltage of the power supply device 210, the safety detection method of the power supply system may further include:

[0142] Obtaining a second voltage difference across the bypass module 224;

[0143] The output voltage of the power supply device 210 is disturbed, including:

[0144] When it is determined that the bypass module 224 is in the bypass state based on the second voltage difference, the output voltage of the power supply device 210 is disturbed.

[0145] In this embodiment, before the output voltage of the power supply device 210 is disturbed, a preliminarily judgment is made as to whether the bypass module 224 is in a bypass state based on a second voltage difference across the bypass module 224. When the bypass module 224 may be in a bypass state, there is a certain safety risk in the off-grid operation of the power supply device 210. The output voltage of the power supply device 210 is disturbed to accurately judge whether the bypass module 224 is in a bypass state, thereby effectively reducing the risk of disturbance to the off-grid operation of the power supply device 210 and ensuring the stability of power supply to the load 230.

[0146] It can be understood that, based on the second voltage difference, it is preliminarily judged that the bypass module 224 is in the bypass state, and the output voltage of the power supply equipment 210 is disturbed. Based on the disturbance voltage signal and the grid-side voltage signal, it is accurately judged that the bypass module 224 is actually in the disconnected state, indicating that the second voltage difference judgment that the bypass module 224 is in the bypass state is a misjudgment, and misjudgment can be effectively avoided through disturbance.

[0147] In some embodiments, after obtaining the second voltage difference across the bypass module 224, the safety detection method of the power supply system may further include:

[0148] When it is determined based on the second voltage difference that the bypass module 224 is in the disconnected state, the output voltage of the power supply device 210 is not disturbed.

[0149] In this embodiment, when it is judged that the bypass module 224 is in a disconnected state based on the second voltage difference across the two ends of the bypass module 224, the electrical connection between the power grid 240 and the power supply device 210 is disconnected, and the power grid 240 will not affect the off-grid operation of the power supply device 210, and will not disturb the output voltage of the power supply device 210, thereby ensuring the stability of the power supply to the load 230.

[0150] In actual implementation, the second voltage difference value may be compared with the target voltage difference threshold, and the working state of the bypass module 224 may be determined according to the comparison result.

[0151] When the second voltage difference is less than the target pressure difference threshold, the bypass module 224 is preliminarily judged to be in the bypass state; when the second voltage difference is greater than or equal to the target pressure difference threshold, the bypass module 224 is judged to be in the disconnected state.

[0152] In some embodiments, obtaining a second voltage difference across the bypass module 224 includes:

[0153] When it is determined that a fault occurs in the power grid 240 , a second voltage difference value is acquired.

[0154] In this embodiment, when a fault occurs in the power grid 240 (for example, overvoltage, undervoltage, overfrequency, underfrequency), the difference between the two ends of the bypass module 224 is detected, and a preliminarily judgment is made whether the bypass module 224 is in a bypass state through the second voltage difference, thereby reducing the scenario of detecting whether the bypass module 224 is bypassed, combining the disturbance for accurate judgment, and reducing the probability of misjudgment.

[0155] For example, the power supply device 210 is an inverter.

[0156] like Fig.12As shown, the inverter is off-grid running, and the voltage difference (i.e., the second voltage difference) across the bypass module 224 of the power distribution cabinet 220 is detected. Based on the voltage difference, it is determined whether the bypass module 224 is suspected to be closed (i.e., whether the bypass module 224 is in the bypass state).

[0157] When the suspected bypass module 224 is closed, the disturbance detection bypass module 224 is used to disturb the output voltage of the power supply device 210 to accurately determine whether the bypass module 224 is closed.

[0158] When it is determined that the bypass module 224 is actually closed, the inverter output is stopped, and the electrical connection between the inverter and the power grid 240 is disconnected to ensure the stability of the inverter power supply to the load 230.

[0159] like Fig.13 As shown, the inverter is off-grid operated, and the voltage difference across the bypass module 224 in the power distribution cabinet 220 is detected. Based on the voltage difference, it is determined whether the bypass module 224 is suspected to be closed.

[0160] When the suspected bypass module 224 is closed, the disturbance detection bypass module 224 is used to disturb the output voltage of the power supply device 210 to accurately determine whether the bypass module 224 is closed.

[0161] When it is determined that the bypass module 224 is actually closed, the inverter side switch (ie, the power supply side switch 221 ) is disconnected, and the electrical connection between the inverter and the power grid 240 is disconnected to ensure the stability of the inverter power supply to the load 230 .

[0162] In an embodiment of the present application, when the power supply device 210 is operating off-grid, the output voltage of the power supply device 210 is disturbed, and at least one of the amplitude, frequency and phase of the voltage is adjusted to obtain a disturbance voltage signal and a grid-side voltage signal. The working state of the bypass module 224 is accurately judged by calculating the first voltage difference or judging whether it follows. A preliminarily judgment is made whether the bypass module 224 is in a bypass state based on the second voltage difference. When the bypass module 224 may be in a bypass state, a disturbance is performed to confirm whether it is actually in a bypass state, thereby reducing the impact of the disturbance on the off-grid operation of the power supply device 210 and ensuring the stability of power supply to the load 230.

[0163] The power supply system safety detection method provided in the embodiment of the present application can be executed by a power supply system safety detection device. In the embodiment of the present application, the power supply system safety detection method is executed by a power supply system safety detection device as an example to illustrate the power supply system safety detection device provided in the embodiment of the present application.

[0164] An embodiment of the present application also provides a safety detection device for a power supply system, wherein the power supply system includes a power supply device 210 and a distribution cabinet 220, wherein the output side of the power supply device 210 is connected to one end of a distribution line in the distribution cabinet 220, and the other end of the distribution line is connected to a power grid 240, and a bypass module 224 is connected in parallel to the distribution line, and the bypass module 224 is used to bypass the distribution line.

[0165] like Fig.14 As shown, the safety detection device of the power supply system includes:

[0166] The acquisition module 1410 is used to disturb the output voltage of the power supply device 210 when the power supply device 210 is off-grid, and obtain the disturbance voltage signal of the power supply device 210 and the grid-side voltage signal of the power distribution cabinet 220;

[0167] The processing module 1420 is used to determine the working state of the bypass module 224 based on the disturbance voltage signal and the grid-side voltage signal.

[0168] According to the safety detection device of the power supply system provided in the embodiment of the present application, by disturbing the output voltage of the power supply device 210 when the power supply device 210 is off-grid, obtaining the disturbance voltage signal and the grid-side voltage signal, and judging the working state of the bypass module 224, the state of the bypass module 224 can be accurately detected, thereby reducing safety regulations and electric shock risks and ensuring the stability of the off-grid operation of the power supply device 210.

[0169] In some embodiments, the processing module 1420 is used to determine the working state of the bypass module 224 based on the disturbance voltage signal and the grid-side voltage signal, including:

[0170] Determine a first voltage difference across the bypass module 224 after the voltage disturbance based on the disturbance voltage signal and the grid-side voltage signal;

[0171] The first voltage difference is compared with the target voltage difference threshold, and the working state of the bypass module 224 is determined according to the comparison result.

[0172] In some embodiments, the processing module 1420 is used to compare the first voltage difference with the target voltage difference threshold, and determine the working state of the bypass module 224 according to the comparison result, including:

[0173] When the first voltage difference is less than the target voltage difference threshold, it is determined that the bypass module 224 is in the bypass state, and the bypass module 224 bypasses the power distribution line;

[0174] Alternatively, when the first voltage difference is greater than or equal to the target voltage difference threshold, it is determined that the bypass module 224 is in the disconnected state.

[0175] In some embodiments, the processing module 1420 is used to determine the working state of the bypass module 224 based on the disturbance voltage signal and the grid-side voltage signal, including:

[0176] Determine whether the grid-side voltage signal changes with the disturbance voltage signal;

[0177] If the grid-side voltage signal changes with the disturbance voltage signal, it is determined that the bypass module 224 is in the bypass state, and the bypass module 224 bypasses the distribution line; if the grid-side voltage signal does not change with the disturbance voltage signal, it is determined that the bypass module 224 is in the disconnected state.

[0178] In some embodiments, before disturbing the output voltage of the power supply device 210 , the acquisition module 1410 is further used to acquire a second voltage difference across the bypass module 224 ;

[0179] When it is determined that the bypass module 224 is in the bypass state based on the second voltage difference, the output voltage of the power supply device 210 is disturbed.

[0180] In some embodiments, after obtaining the second voltage difference across the bypass module 224, the acquisition module 1410 is further configured to not disturb the output voltage of the power supply device 210 when it is determined that the bypass module 224 is in a disconnected state based on the second voltage difference.

[0181] In some embodiments, the acquisition module 1410 is used to acquire the second voltage difference across the bypass module 224, including:

[0182] When it is determined that a fault occurs in the power grid 240 , a second voltage difference value is acquired.

[0183] In some embodiments, the acquisition module 1410 is used to disturb the output voltage of the power supply device 210, including:

[0184] At least one of the amplitude, frequency and phase of the output voltage of the power supply device 210 is disturbed.

[0185] The safety detection device of the power supply system in the embodiment of the present application may be an electronic device, or a component in the electronic device, such as an integrated circuit or a chip.

[0186] The safety detection device for the power supply system provided in the embodiment of the present application can implement each process implemented in the embodiment of the safety detection method for the power supply system described above, and will not be described again here to avoid repetition.

[0187] The embodiment of the present application also provides a power supply system.

[0188] like Figure 2As shown, the power supply system includes: power supply equipment 210, a power distribution cabinet 220 and the safety detection device of the power supply system as described above.

[0189] The power supply device 210 is a device that can perform AC-DC conversion and voltage conversion on input electrical energy, such as an inverter, a converter, etc.

[0190] The power distribution cabinet 220 can monitor the power parameters such as current, voltage, power, frequency, etc. in real time, and realize the reasonable distribution of electric energy through different devices such as switches, circuit breakers, contactors and fuses.

[0191] The load 230 powered by the power supply system may also be connected to the distribution line. The distribution cabinet 220 distributes the electric energy output by the power supply device 210 and the electric energy of the power grid 240 to the load 230 through the distribution line so that the load 230 can operate.

[0192] The bypass module 224 refers to an electrical device that can implement a bypass function, such as a contactor, a mechanical switch, and the like.

[0193] When the bypass module 224 is in the bypass state, the electrical connection between the power supply system and the grid 240 is conducted, and the grid 240 can supply power to the load 230. When the bypass module 224 is in the disconnected state, the electrical connection between the power supply system and the grid 240 is disconnected.

[0194] In actual implementation, the line connecting the distribution cabinet 220 and the power supply equipment 210 can be set with a power supply side switch 221 (i.e., switch S1), the line connecting the distribution cabinet 220 and the load 230 can be set with a load side switch 223, and the line connecting the distribution cabinet 220 and the power grid 240 can be set with a power grid 240 switch. Through the power supply side switch 221, the load side switch 223 (i.e., switch S3) and the power grid side switch 222 (i.e., switch S3), the power supply equipment 210, the load 230 and the power grid 240 are respectively controlled to determine whether the electrical connection with the distribution cabinet 220 is turned on.

[0195] In this embodiment, the distribution cabinet 220 is provided with a distribution line, the output side of the power supply equipment 210 is connected to one end of the distribution line, the other end of the distribution line is connected to the power grid 240, and the distribution line is connected in parallel with a bypass module 224 (i.e., switch S4), and the bypass module 224 is used to bypass the distribution line; the safety detection device is used to detect the working status of the bypass module 224.

[0196] When the power supply device 210 is operating off-grid, the output voltage of the power supply device 210 is disturbed, and periodic or non-periodic changes are introduced on the output voltage of the power supply device 210 to obtain a disturbance voltage signal and a grid-side voltage signal. Compared with the method of judging by sampling voltage, the working state of the bypass module 224 can be judged more accurately based on the disturbance voltage signal and the grid-side voltage signal. There is no need to design feedback contacts in the distribution cabinet 220, which reduces the construction difficulty. For the distribution cabinet 220 with feedback contacts, even if the feedback contacts fail, the working state of the bypass module 224 can be accurately judged, effectively reducing safety regulations and electric shock risks.

[0197] According to the power supply system provided in the embodiment of the present application, by disturbing the output voltage of the power supply device 210 when the power supply device 210 is off-grid, obtaining the disturbance voltage signal and the grid-side voltage signal, and judging the working status of the bypass module 224, the status of the bypass module 224 can be accurately detected, the safety regulations and electric shock risks can be reduced, and the stability of the off-grid operation of the power supply device 210 can be ensured.

[0198] In some embodiments, the power supply device 210 is configured to stop output when the safety detection device determines that the bypass module 224 is in the bypass state.

[0199] In this embodiment, it is determined that the bypass module 224 is in the bypass state. At this time, the distribution line of the distribution cabinet 220 is bypassed by the bypass module 224, and the electrical connection between the power supply equipment 210 and the power grid 240 is turned on. At this time, the power supply equipment 210 is controlled to stop output to prevent the off-grid power supply equipment 210 and the power grid 240 from affecting each other, thereby ensuring the stability of the power supply system to the load 230.

[0200] In some embodiments, a power supply side switch 221 is provided on the distribution line near the power supply device 210 , and the distribution cabinet 220 is used to disconnect the power supply side switch 221 when the safety detection device determines that the bypass module 224 is in the bypass state.

[0201] In this embodiment, it is determined that the bypass module 224 is in the bypass state. At this time, the distribution line of the distribution cabinet 220 is bypassed by the bypass module 224, and the electrical connection between the power supply equipment 210 and the power grid 240 is turned on. At this time, the electrical connection between the power supply equipment 210 and the power grid 240 is disconnected by disconnecting the power supply side switch 221, thereby preventing the off-grid power supply equipment 210 and the power grid 240 from affecting each other, thereby ensuring the stability of the power supply system to the load 230.

[0202] In some embodiments, Fig.15As shown, an embodiment of the present application also provides an electronic device 1500, including a processor 1501, a memory 1502, and a computer program stored in the memory 1502 and executable on the processor 1501. When the program is executed by the processor 1501, each process of the embodiment of the safety detection method for the power supply system described above is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0203] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0204] An embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the above-mentioned power supply system safety detection method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0205] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0206] An embodiment of the present application also provides a computer program product, including a computer program, which implements the above-mentioned power supply system safety detection method when executed by a processor.

[0207] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0208] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned power supply system safety detection method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0209] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0210] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0211] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0212] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0213] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0214] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A safety detection method for a power supply system, characterized in that: The power supply system includes a power supply device and a distribution cabinet, the output side of the power supply device is connected to one end of a distribution line in the distribution cabinet, the other end of the distribution line is connected to a power grid, the distribution line is connected in parallel with a bypass module, and the bypass module is used to bypass the distribution line. The method includes: When the power supply device is off-grid, disturb the output voltage of the power supply device to obtain a disturbance voltage signal of the power supply device and a grid-side voltage signal of the power distribution cabinet; Based on the disturbance voltage signal and the grid-side voltage signal, the working state of the bypass module is determined.

2. The power supply system safety detection method according to claim 1, characterized in that: The determining the working state of the bypass module based on the disturbance voltage signal and the grid-side voltage signal includes: Determine a first voltage difference across the bypass module after a voltage disturbance based on the disturbance voltage signal and the grid-side voltage signal; Based on the comparison between the first voltage difference value and the target voltage difference threshold, the working state of the bypass module is determined according to the comparison result.

3. The safety detection method for a power supply system according to claim 2, characterized in that: The comparing the first voltage difference with the target voltage difference threshold and determining the working state of the bypass module according to the comparison result includes: When the first voltage difference is less than the target voltage difference threshold, determining that the bypass module is in a bypass state, and the bypass module bypasses the power distribution line; Alternatively, when the first voltage difference is greater than or equal to the target voltage difference threshold, it is determined that the bypass module is in a disconnected state.

4. The power supply system safety detection method according to claim 1, characterized in that: The determining the working state of the bypass module based on the disturbance voltage signal and the grid-side voltage signal includes: Determining whether the grid-side voltage signal changes with the disturbance voltage signal; If the grid-side voltage signal changes with the disturbance voltage signal, it is determined that the bypass module is in the bypass state and the bypass module bypasses the distribution line; if the grid-side voltage signal does not change with the disturbance voltage signal, it is determined that the bypass module is in the disconnected state.

5. The power supply system safety detection method according to any one of claims 1 to 4, characterized in that: Before disturbing the output voltage of the power supply device, the method further includes: Acquire a second voltage difference across the bypass module; The disturbing the output voltage of the power supply device comprises: When it is determined that the bypass module is in the bypass state based on the second voltage difference, the output voltage of the power supply device is disturbed.

6. The power supply system safety detection method according to claim 5, characterized in that: After obtaining the second voltage difference across the bypass module, the method further includes: When it is determined based on the second voltage difference that the bypass module is in the disconnected state, the output voltage of the power supply device is not disturbed.

7. The power supply system safety detection method according to claim 5, characterized in that: The obtaining a second voltage difference between two ends of the bypass module includes: When it is determined that a fault occurs in the power grid, the second voltage difference value is obtained.

8. The power supply system safety detection method according to any one of claims 1 to 4, characterized in that: The disturbing the output voltage of the power supply device comprises: At least one of the amplitude, frequency and phase of the output voltage of the power supply device is disturbed.

9. A safety detection device for a power supply system, characterized in that: The power supply system includes a power supply device and a distribution cabinet, the output side of the power supply device is connected to one end of a distribution line in the distribution cabinet, the other end of the distribution line is connected to a power grid, a bypass module is connected in parallel to the distribution line, and the bypass module is used to bypass the distribution line. The device includes: An acquisition module, used to disturb the output voltage of the power supply device when the power supply device is off-grid, and obtain the disturbance voltage signal of the power supply device and the grid-side voltage signal of the power distribution cabinet; A processing module is used to determine the working state of the bypass module based on the disturbance voltage signal and the grid-side voltage signal.

10. A power supply system, characterized in that: include: Power supply equipment; A power distribution cabinet, wherein the power distribution cabinet is provided with a power distribution line, the output side of the power supply device is connected to one end of the power distribution line, the other end of the power distribution line is connected to the power grid, and the power distribution line is connected in parallel with a bypass module, and the bypass module is used to bypass the power distribution line; The safety detection device of the power supply system as claimed in claim 9, wherein the safety detection device is used to detect the working status of the bypass module.

11. The power supply system according to claim 10, characterized in that: The power supply device is used to stop output when the safety detection device determines that the bypass module is in the bypass state.

12. The power supply system according to claim 10, characterized in that: A power supply side switch is provided on the distribution line near the power supply device, and the power distribution cabinet is used to disconnect the power supply side switch when the safety detection device determines that the bypass module is in the bypass state.

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