Arcing signal acquisition and test device and photovoltaic system
By designing an arc signal acquisition and testing device that includes a switch module and a control module, the existing arc signal detection method is solved, and more efficient current data acquisition and arc signal testing are achieved.
Patent Information
- Application Number
- CN202520310644.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2035-02-26
AI Technical Summary
The existing arc pull detection method requires a large number of current data samples of faulty arcs, which consumes a lot of time and reduces the testing efficiency.
An arc-pull signal acquisition and testing device is designed, including a first contact head, a second contact head, a first terminal, a second terminal, a switch module and a control module. By switching the on-state of the switch module, the arc-pull test of different photovoltaic strings is directly carried out to avoid the complex process of inverter power outage and line reconnection.
It improves the efficiency of current data acquisition, simplifies the arc signal acquisition and testing process of different photovoltaic strings, and improves the testing efficiency.
Smart Images
Figure CN222748659U_ABST
Abstract
Description
Technical Field
[0001] The utility model embodiment relates to the field of new energy technology, and in particular to an arc signal acquisition and testing device and a photovoltaic system. Background Art
[0002] In power systems, arc faults may cause electrical fires and system failures. Current arc detection methods require the use of a large number of fault arc current data samples, and a series of analyses are performed to determine whether an arc exists. However, the collection process of a large number of fault arc current data samples is time-consuming, which reduces the efficiency of arc testing. Utility Model Content
[0003] The utility model provides an arc signal collection and testing device and a photovoltaic system to improve the efficiency of arc signal collection and testing.
[0004] In a first aspect, an embodiment of the utility model provides an arc signal acquisition and testing device, including a first contact head, a second contact head, at least two first terminals, a second terminal, at least two first switch modules, a control module and a sliding module;
[0005] Each of the first terminals is respectively connected to a first end of a first switch module, the second end of the first switch module is connected to the first end of the first contact head, the second end of the first contact head is arranged opposite to the first end of the second contact head, and the second end of the second contact head is connected to the second terminal; the second contact head is linked to the sliding module, the sliding module moves along a first direction, the control module is connected to the control end of the first switch module, and the control module is used to control the conduction state of the first switch module; wherein the first direction is the direction of the connection line between the second end of the first contact head and the first end of the second contact head.
[0006] Optionally, the arc signal acquisition and testing device also includes a second switch module; the first end of the second switch module is connected to the first end of the first contact head, the second end of the second switch module is connected to the second end of the second contact head, and the control end of the second switch module is connected to the control module, and the control module is used to control the conduction state of the second switch module.
[0007] Optionally, the first end of the second switch module is connected to the first end of the first contact head through a first cable, and the second end of the second switch module is connected to the second end of the second contact head through a second cable.
[0008] Optionally, the first switch module includes a first relay; a first end of the first relay is connected to the first terminal, a second end of the first relay is connected to the first end of the first contact, and a control end of the first relay is connected to the control module.
[0009] Optionally, the second switch module includes a second relay; a first end of the second relay is connected to the first end of the first contact, a second end of the second relay is connected to the second end of the second contact, and a control end of the second relay is connected to the control module.
[0010] Optionally, the arcing signal acquisition test device further includes a current acquisition module, which is connected to the second contact head and is used to acquire the current signal output by the second contact head.
[0011] Optionally, the arc signal acquisition and testing device further includes a base; the first contact head is fixed on the base, and the sliding module moves along the first direction on the base.
[0012] Optionally, the arc signal acquisition and testing device further includes a first insulating clamp and a second insulating clamp;
[0013] The first contact head is fixed on the base through the first insulating clamp block, and the second contact head is linked to the sliding module through the second insulating clamp block.
[0014] Optionally, the sliding module includes a slider, a connecting rod and a button;
[0015] The slider is linked to the second insulating clamp, the second insulating clamp is linked to the second contact head, the connecting rod is linked to the slider, and the button is linked to the connecting rod.
[0016] In a second aspect, an embodiment of the utility model further provides a photovoltaic system, comprising at least two photovoltaic strings, an inverter, and the arc signal acquisition and testing device described in the first aspect;
[0017] Each first terminal of the arc signal acquisition and testing device is connected to the positive pole of the photovoltaic string, the second terminal of the arc signal acquisition and testing device is connected to the positive pole of the inverter, and the negative pole of the photovoltaic string is connected to the negative pole of the inverter.
[0018] The technical solution of the embodiment of the utility model is to set an arc signal acquisition and testing device including at least two first terminals and at least two first switch modules, and the first terminals are connected to the first switch modules in a one-to-one correspondence. When different photovoltaic strings are subjected to arc tests, the conduction states of different first switch modules can be directly switched through the control module, thereby avoiding the complex process of powering off the inverter and reconnecting the line when different photovoltaic strings are subjected to arc tests, improving the efficiency of current data acquisition, and thus improving the efficiency of arc signal acquisition and testing of different photovoltaic strings. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 A schematic diagram of the structure of an arc signal acquisition and testing device provided by an embodiment of the utility model;
[0020] Figure 2 A schematic diagram of the structure of another arc signal acquisition and testing device provided by an embodiment of the utility model;
[0021] Figure 3 A schematic diagram of the working process of an arc signal acquisition and testing device provided by an embodiment of the utility model;
[0022] Figure 4 A schematic diagram of the principle structure of an arc signal acquisition and testing device provided by an embodiment of the utility model;
[0023] Figure 5 A schematic diagram of the state of an arc signal acquisition and testing device provided by an embodiment of the utility model when collecting arc current data samples;
[0024] Figure 6 A schematic diagram of the state of an arc signal acquisition and testing device provided by an embodiment of the utility model when acquiring normal current data samples;
[0025] Figure 7 A schematic diagram of the structure of a photovoltaic system provided by an embodiment of the utility model;
[0026] Figure 8 A schematic diagram of a flow chart of an arc test for a photovoltaic system provided in an embodiment of the utility model. DETAILED DESCRIPTION
[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0028] Figure 1The schematic diagram of the structure of an arc signal acquisition and testing device provided by the embodiment of the utility model. Figure 1 As shown, the arc signal acquisition and testing device includes a first contact head 11, a second contact head 12, at least two first terminals 13, a second terminal 14, at least two first switch modules 15, a control module 16 and a sliding module 17; each first terminal 13 is respectively connected to the first end of a first switch module 15, the second end of the first switch module 15 is connected to the first end of the first contact head 11, the second end of the first contact head 11 is arranged opposite to the first end of the second contact head 12, and the second end of the second contact head 12 is connected to the second terminal 14; the second contact head 12 is linked to the sliding module 17, the sliding module 17 moves along the first direction X, the control module 16 is connected to the control end of the first switch module 15, and the control module 16 is used to control the conduction state of the first switch module 15; wherein the first direction X is the direction of the connecting line between the second end of the first contact head 11 and the first end of the second contact head 12.
[0029] Specifically, Figure 1 As shown, the number of the first terminals 13 is equal to the number of the first switch modules 15. The first terminals 13 are connected to the first switch modules 15 in a one-to-one correspondence. The first switch module 15 has a switch function. When the arc signal acquisition and testing device is applied to a photovoltaic system, the control module 16 can be connected to the inverter in the photovoltaic system for communication, and is used to receive the control signal sent by the inverter. The control module 16 can control the conduction or shutdown of the first switch module 15 according to the control signal sent by the inverter. The first contact head 11 and the second contact head 12 can be conductors. When the sliding module 17 slides along the first direction X, the second contact head 12 can slide along the first direction X, so that the second contact head 12 can slide in the direction close to the first contact head 11 to achieve contact with the first contact head 11. Or it can slide in the direction away from the first contact head 11 to achieve separation from the first contact head 11.
[0030] When the arc signal acquisition and testing device is applied to a power system, such as a photovoltaic system, to obtain a large number of current data samples of fault arcs required for the arc detection method, each first terminal 13 can be connected to the positive pole of a photovoltaic string to be tested by arcing, so that the current provided by each photovoltaic string to be tested by arcing is output to the first contact head 11 through a first switch module 15, and the second terminal 14 can be connected to the positive pole of the inverter. When collecting current data samples of the photovoltaic string, the first switch module 15 corresponding to the photovoltaic string can be controlled to be in a conducting state through the control module 16. The first contact head and the second contact head are in an initial closed state, and then the sliding module 17 is controlled to slide along the first direction X in a direction away from the first contact head 11, thereby controlling the distance between the first contact head 11 and the second contact head 12, and collecting the current arc current data as the current data sample of the fault arc of the photovoltaic string. After collecting the arc current data of the photovoltaic string, the sliding module 17 can be controlled to slide along the first direction X towards the first contact head 11, so that the first contact head 11 and the second contact head 12 are tightly closed, and then the current normal current data is collected as a normal current data sample of the photovoltaic string.
[0031] When collecting the current data sample of another photovoltaic string, the first switch module 15 corresponding to the connection of the other photovoltaic string can be directly controlled by the control module 16 to be in the on state. The first contact head and the second contact head are in the initial closed state, and then the sliding module 17 is controlled to slide along the first direction X in the direction away from the first contact head 11, thereby controlling the distance between the first contact head 11 and the second contact head 12, and collecting the current arc current data as the current data sample of the fault arc of another photovoltaic string. After collecting the arc current data of another photovoltaic string, the sliding module 17 can be controlled to slide along the first direction X in the direction close to the first contact head 11, so that the first contact head 11 and the second contact head 12 are tightly closed, and then the current normal current data is collected as the normal current data sample of another photovoltaic string. It can be seen from the above process that in the process of collecting current data of different photovoltaic strings, the conduction states of different first switch modules 15 can be directly switched through the control module 16, thereby avoiding the complicated process of powering off the inverter and reconnecting the lines when performing arc tests on different photovoltaic strings, improving the efficiency of current data collection, and thus improving the efficiency of arc signal collection and testing of different photovoltaic strings.
[0032] In some embodiments, at least two first switch modules 15 can also be set to be turned on at the same time. The first contact head and the second contact head are in an initial closed state, and then the sliding module 17 is controlled to slide in the direction away from the first contact head 11 along the first direction X, thereby controlling the distance between the first contact head 11 and the second contact head 12, and collecting the current arc current data as the current data sample of the fault arc of at least two photovoltaic strings. Then the sliding module 17 can be controlled to slide in the direction close to the first contact head 11 along the first direction X, so that the first contact head 11 and the second contact head 12 are tightly closed, and then the current normal current data is collected as the normal current data sample of at least two photovoltaic groups. In the subsequent data processing process, the arc test of each photovoltaic string in at least two photovoltaic strings can be implemented according to the current data sample and the normal current data sample of the fault arc of at least two photovoltaic strings, so that the number of times the current data is obtained during the arc test of at least two photovoltaic strings can be reduced, and then the current data collection efficiency can be further improved, and the arc signal collection and test efficiency of different photovoltaic strings can be improved.
[0033] The technical solution of this embodiment is to set the arc signal acquisition and testing device to include at least two first terminals and at least two first switch modules, and the first terminals are connected to the first switch modules in a one-to-one correspondence. When different photovoltaic strings are subjected to arc tests, the conduction states of different first switch modules can be directly switched through the control module, thereby avoiding the complex process of powering off the inverter and reconnecting the line when different photovoltaic strings are subjected to arc tests, improving the efficiency of current data acquisition, and thus improving the efficiency of arc signal acquisition and testing of different photovoltaic strings.
[0034] In some embodiments, the first switch module includes a first relay; a first end of the first relay is connected to the first terminal, a second end of the first relay is connected to the first end of the first contact, and a control end of the first relay is connected to the control module.
[0035] Specifically, the control module can control the power on or off of the first relay according to the control signal to control the conduction or shutoff of the first relay, so as to perform an arc test for the photovoltaic string connected to the first relay. When the first relay is turned on, the current provided by the corresponding photovoltaic string can be output to the first contact 11 through the first terminal and the first relay. The sliding module 17 can control the distance between the second contact 12 and the first contact 11, so that the current data sample of the fault arc of the photovoltaic string can be collected. Then the sliding module 17 can control the second contact 12 to be tightly closed with the first contact 11, so that the normal current data sample of the photovoltaic string can be collected. When testing another photovoltaic string, the first relay can be controlled to be turned off, and the first relay corresponding to the other photovoltaic string can be controlled to be turned on, and the sliding module 17 can be repeatedly controlled to drive the second contact 12 to act, so as to realize the arc test of another photovoltaic string. It can be seen from the above process that when performing arc tests on different photovoltaic strings, it is only necessary to switch the conduction or disconnection of different first relays to achieve arc test switching of different photovoltaic strings, which simplifies the arc test switching process of different photovoltaic strings and improves the arc signal collection and test efficiency of different photovoltaic strings.
[0036] In some embodiments, at least two first relays can be set to be turned on at the same time to simultaneously obtain current data samples and normal current data samples of the fault arc of at least two photovoltaic strings, thereby reducing the number of times current data is obtained during the arc test of at least two photovoltaic strings, further improving the current data collection efficiency, and improving the arc signal collection and testing efficiency of different photovoltaic strings.
[0037] Figure 2 A schematic diagram of another arc signal acquisition and testing device provided by an embodiment of the utility model. Figure 2 As shown, the arc signal acquisition and testing device also includes a second switch module 18; the first end of the second switch module 18 is connected to the first end of the first contact head 11, the second end of the second switch module 18 is connected to the second end of the second contact head 12, and the control end of the second switch module 18 is connected to the control module 16, and the control module 16 is used to control the conduction state of the second switch module 18.
[0038] Specifically, the second switch module 18 has a switch function. In the arc test of the photovoltaic assembly, at least one first switch module 15 is turned on. When obtaining the current data sample of the fault arc of the photovoltaic string, the second switch module 18 can be controlled to be turned off, and the sliding module 17 slides along the first direction X in the direction close to the first contact head 11, so that the first contact head 11 and the second contact head 12 contact to generate an arc, and collect the current arc current data as the current data sample of the fault arc of the photovoltaic string. When obtaining the normal current data sample of the photovoltaic string, the second switch module 18 can be controlled to be turned on, and the second switch module 18 is connected in parallel with the first contact head 11 and the second contact head 12, and there are two current channels, one of which is the channel formed by the second switch module 18, and the other current channel is the channel formed by the first contact head 11 and the second contact head 12. Then the sliding module 17 slides along the first direction X in the direction away from the first contact head 11, so that the first contact head 11 and the second contact head 12 are separated. Since the second switch module 18 has a current channel at this time, no arc will be generated between the first contact head 11 and the second contact head 12. Therefore, when collecting normal current data samples, the problem of inaccurate normal current data samples caused by a dark arc between the first contact head 11 and the second contact head 12 can be avoided, thereby improving the accuracy of the normal current data samples, and further improving the accuracy of the arc test.
[0039] Figure 3 A schematic diagram of the working process of an arc signal acquisition and testing device provided by an embodiment of the utility model. Figures 1 to 3As shown, when the arc signal acquisition and testing device includes N (N is an integer greater than 2) first terminals and is applied to a photovoltaic system, after the arc signal acquisition and testing device is connected to N photovoltaic strings to be tested for arcing; the control module can determine whether it is necessary to connect the arc signal acquisition and testing device to the photovoltaic string line of the i-th string (or two strings or more in parallel) according to the control signal sent by the inverter, and collect current data samples. If so, the first switch module corresponding to the i-th photovoltaic string in the arc signal acquisition and testing device is controlled to be turned on. If not, the first switch module corresponding to the i-th photovoltaic string in the arc signal acquisition and testing device is controlled to be turned off. When collecting current data samples, in the next step, it is determined whether it is necessary to collect arc current data samples. If so, the second switch module is controlled to be turned off, and the first contact head and the second contact head are in an initial closed state; in the next step, the sliding module is controlled to slide along the first direction away from the first contact head, and the distance between the first contact head and the second contact head is controlled to generate an arc; finally, the arc current data at this time is collected as the current data sample of the fault arc. If not, determine whether it is necessary to collect normal current data samples. If yes, control the second switch module to conduct, and the first contact head and the second contact head are in the initial closed state; in the next step, control the sliding module to slide in the first direction away from the first contact head, and control the first contact head and the second contact head to be in the open state. Since the second switch module is conducted at this time, no arc will be generated between the first contact head and the second contact head. Finally, collect the arc current data at this time as a normal current data sample. If no, end.
[0040] In some embodiments, the second switch module includes a second relay; a first end of the second relay is connected to a first end of the first contact, a second end of the second relay is connected to a second end of the second contact, and a control end of the second relay is connected to the control module.
[0041] Specifically, the control module can control the power on or off of the second relay according to the control signal to control the conduction or disconnection of the second relay. When the second relay is turned on, the current channel formed by the second relay is connected in parallel with the current channel formed by the first contact head and the second contact head. When the first contact head and the second contact head change from a closed state to a separated state, no current will be generated between the first contact head and the second contact head, thereby improving the accuracy of the normal current data sample, and further improving the accuracy of the arc test.
[0042] For example, Figure 4 A schematic diagram of the principle structure of an arc signal acquisition and testing device provided by an embodiment of the utility model, Figure 5 A schematic diagram of the state of an arc signal acquisition and testing device provided by an embodiment of the utility model when collecting arc current data samples, Figure 6A schematic diagram of the state of an arc signal acquisition and testing device provided by the embodiment of the utility model when collecting normal current data samples. Figures 4 to 6 As shown, the on / off of K1, K2, K3, K4...Kn represents the on / off of N first relays, and the on / off of Ks represents the on / off of the second relay. PV1+, PV2+, PV3+, PV4+...PVn+ are respectively the positive poles of the N photovoltaic strings connected to the N first terminals. The arc machine represents the structures such as the first contact head, the second contact head and the sliding module. When it is necessary to collect the current data of at least one photovoltaic string, the first relay corresponding to the photovoltaic string for which the current data needs to be collected is controlled to be turned on. For example, Figure 5 In the example, the first relay K1 and the second relay K2 are turned on. At this time, the current data collected are the current data of the first photovoltaic string and the second photovoltaic string. When collecting current data, if it is necessary to collect arc current data, such as Figure 5 As shown, the second relay Ks can be controlled to be turned off, and then the arc drawing machine can be controlled to generate an arc, that is, the distance between the first contact head and the second contact head is controlled by the sliding module to generate an arc, and the current current data is collected as the arc drawing current data. If normal current data needs to be collected, such as Figure 6 As shown, the second relay Ks can be controlled to be turned on, and then the arc drawing machine can be controlled to separate through the sliding module, that is, the first contact head and the second contact head are disconnected, the current flows through the channel of the second relay Ks, and the current current data is collected as normal current data.
[0043] In some embodiments, the first end of the second switch module is connected to the first end of the first contact head through a first cable, and the second end of the second switch module is connected to the second end of the second contact head through a second cable.
[0044] Specifically, the cable can carry current and can transmit smaller power or signals. The cable has a simple structure. The first end of the second switch module is connected to the first end of the first contact head through the first cable, and the second end of the second switch module is connected to the second end of the second contact head through the second cable, which can reduce the cost of the arc signal acquisition test device. In addition, the hardness of the cable is low, and when the second contact head slides along the first direction, the connection reliability between the second switch module and the second contact head can be guaranteed.
[0045] On the basis of the above technical solutions, the arc signal acquisition and testing device further includes a current acquisition module, which is connected to the second contact head and is used to acquire the current signal output by the second contact head.
[0046] Specifically, the current acquisition module can be directly connected to the second contact head, or can be indirectly connected to the second contact head, for collecting the current output by the second contact head. When a first relay is turned on, the current output by the second contact head is the current data of a photovoltaic string. When at least two first relays are turned on, the current output by the second contact head is the current data of at least two photovoltaic strings. In addition, when the second relay is disconnected, the current output by the second contact head can be arc current data. When the second relay is turned on, the current output by the second contact head can be normal current data. Exemplarily, the current acquisition module can be a current sensor.
[0047] Continue to refer Figure 1 and Figure 2 The arc signal acquisition and testing device further includes a base 19 ; the first contact head 11 is fixed on the base 19 , and the sliding module 17 moves on the base 19 along the first direction X.
[0048] Specifically, the base 19 can be used to carry other parts of the arc signal acquisition and testing device. The first contact head 11 is fixed on the base 19, so that the first contact head 11 can be fixed. The sliding module 17 moves along the first direction X on the base 19, which can drive the second contact head 12 to move along the first direction X on the base 19, so that the contact and separation of the first contact head 11 and the second contact head 12 can be controlled by the movement of the sliding module 17.
[0049] Continue to refer Figure 1 and Figure 2 The arc signal acquisition and testing device further includes a first insulating clamp 20 and a second insulating clamp 21 ; the first contact head 11 is fixed to the base 19 through the first insulating clamp 20 , and the second contact head 12 is linked to the sliding module 17 through the second insulating clamp 21 .
[0050] Specifically, the first insulating clamp 20 is used to fix the first contact head 11 and the base 19, and the second insulating clamp 21 is used to fix the second contact head 12 and the sliding module 17. The first insulating clamp 20 and the second insulating clamp 21 are both insulators to avoid the risk of short circuit between the first contact head 11 and the second contact head 12 in a separated state.
[0051] Continue to refer Figure 1 and Figure 2 The sliding module 17 includes a slider 171, a connecting rod 172 and a button 173; the slider 171 is linked to the second insulating clamp 21, the second insulating clamp 21 is linked to the second contact head 12, the connecting rod 172 is linked to the slider 171, and the button 173 is linked to the connecting rod 172.
[0052] Specifically, the slider 171 can move along the first direction X on the base 19. When the button 173 has a force in the direction of approaching the first contact head 11, the force on the button 173 acts on the slider 171 through the connecting rod 172, so that the slider 171 moves in the direction of approaching the first contact head 11, thereby driving the second contact head 12 to move in the direction of approaching the first contact head 11 through the second insulating clamp 21, and achieving contact between the first contact head 11 and the second contact head 12. When the button 173 has a force in the direction of moving away from the first contact head 11, the force on the button 173 acts on the slider 171 through the connecting rod 172, so that the slider 171 moves in the direction of moving away from the first contact head 11, thereby driving the second contact head 12 to move in the direction of moving away from the first contact head 11 through the second insulating clamp 21, and achieving separation of the first contact head 11 and the second contact head 12.
[0053] The embodiment of the utility model also provides a photovoltaic system. Figure 7 The schematic diagram of the structure of a photovoltaic system provided by the embodiment of the utility model is as follows. Figure 7 As shown, the photovoltaic system includes at least two photovoltaic strings 100, an inverter 200, and an arc signal acquisition and testing device 300 provided in any embodiment of the utility model. Each first terminal of the arc signal acquisition and testing device 300 is connected to the positive pole PV+ of a photovoltaic string 100, the second terminal of the arc signal acquisition and testing device 300 is connected to the positive pole of the inverter 200, and the negative pole PV- of the photovoltaic string 100 is connected to the negative pole of the inverter 200.
[0054] Specifically, Figure 7 The PV system is shown in an exemplary manner as comprising two PV strings 100, wherein the positive pole PV+ of each PV string 100 is connected to a first terminal of the arc signal acquisition and testing device 300, the negative pole PV- of each PV string 100 is connected to the negative pole of the inverter 200, and the second terminal of the arc signal acquisition and testing device 300 is connected to the positive pole of the inverter 200. The inverter 200 has an inversion function, and exemplarily, the inverter 200 comprises a maximum power point tracking (MPPT) circuit, a bus capacitor and an inversion circuit. At this time, different PV strings 100 are connected to different first switch modules in a one-to-one correspondence through different first terminals. When arc tests are performed on different photovoltaic strings 100, the conduction states of the first switch modules corresponding to the different photovoltaic strings 100 can be directly controlled to implement arc test switching of different photovoltaic strings 100, thereby avoiding the complicated process of powering off the inverter and reconnecting the lines when arc tests are performed on different photovoltaic strings, improving the efficiency of current data collection, and thus improving the arc signal collection and testing efficiency of different photovoltaic strings.
[0055] Exemplarily, the photovoltaic system further includes a host computer, which is in communication connection with the inverter 200. The inverter 200 is also in communication connection with a control module in the arc signal acquisition and testing device 300. Figure 8 A schematic diagram of a process flow of an arc test for a photovoltaic system provided by an embodiment of the utility model. Figure 8 As shown, in the process of current data collection, the photovoltaic string access instruction and the data collection instruction can be first issued to the inverter 200 through the host computer. Among them, the photovoltaic string access instruction is used to characterize the photovoltaic string among the N photovoltaic strings that currently needs to be connected to the arc signal acquisition and testing device 300. The data collection instruction includes an arc current data collection instruction and a normal current data collection instruction. After the inverter 200 receives the photovoltaic string access instruction and the data collection instruction, it determines that the data collection instruction is an arc current data collection instruction or a normal current data collection instruction, and sends the arc current data collection instruction or the normal current data collection instruction to the arc signal acquisition and testing device 300, and at the same time sends the photovoltaic string access instruction to the arc signal acquisition and testing device 300.
[0056] After receiving the photovoltaic string access instruction, the arc signal acquisition test device 300 detects the states of the first switch modules corresponding to all photovoltaic strings according to the photovoltaic string access instruction, and adjusts the state of each first switch module. When the photovoltaic string access instruction indicates that the i-th photovoltaic string needs to be connected to the arc signal acquisition test device 300, if the i-th first switch module is detected to be in the off state, the i-th first switch module is controlled to be in the on state; if the i-th first switch module is detected to be in the on state, the i-th first switch module is maintained in the on state. Similarly, the other first switch modules are controlled to be in the off state.
[0057] The arcing signal acquisition test device 300 detects the state of the second switch module according to the acquisition data instruction and adjusts the state of the second switch module. When the acquisition data instruction received by the arcing signal acquisition test device 300 is an arc current data acquisition instruction, if the second switch module is in the on state, the second switch module is controlled to be turned off; if the second switch module is in the off state, the off state of the second switch module is maintained. When the acquisition data instruction received by the arcing signal acquisition test device 300 is an instruction to collect normal current data, if the second switch module is in the on state, the on state of the second switch module is maintained; if the second switch module is in the off state, the second switch module is controlled to be turned on.
[0058] Then, the state of the arc machine is controlled according to the data collection instruction, and the current data is collected. When the data collection instruction received by the arc signal collection test device 300 is an arc current data collection instruction, the distance between the first contact head and the second contact head is controlled so that the arc signal collection test device 300 generates an arc, and the current data at this time is collected as the arc current data, and the arc current data is uploaded to the host computer through the inverter 200. When the data collection instruction received by the arc signal collection test device 300 is a normal current data collection instruction, the first contact head and the second contact head in the arc signal collection test device 300 are controlled to separate, and the current data at this time is collected as the normal current data, and the normal current data is uploaded to the host computer through the inverter 200.
[0059] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. An arc signal acquisition and testing device, characterized in that: It includes a first contact head, a second contact head, at least two first terminals, a second terminal, at least two first switch modules, a control module and a sliding module; Each of the first terminals is respectively connected to a first end of a first switch module, the second end of the first switch module is connected to the first end of the first contact head, the second end of the first contact head is arranged opposite to the first end of the second contact head, and the second end of the second contact head is connected to the second terminal; the second contact head is linked to the sliding module, the sliding module moves along a first direction, the control module is connected to the control end of the first switch module, and the control module is used to control the conduction state of the first switch module; wherein the first direction is the direction of the connection line between the second end of the first contact head and the first end of the second contact head.
2. The arc signal acquisition and testing device according to claim 1, characterized in that: It also includes a second switch module; the first end of the second switch module is connected to the first end of the first contact head, the second end of the second switch module is connected to the second end of the second contact head, the control end of the second switch module is connected to the control module, and the control module is used to control the conduction state of the second switch module.
3. The arc signal acquisition and testing device according to claim 2, characterized in that: The first end of the second switch module is connected to the first end of the first contact head through a first cable, and the second end of the second switch module is connected to the second end of the second contact head through a second cable.
4. The arc signal acquisition and testing device according to claim 1, characterized in that: The first switch module includes a first relay; a first end of the first relay is connected to the first terminal, a second end of the first relay is connected to the first end of the first contact, and a control end of the first relay is connected to the control module.
5. The arc signal acquisition and testing device according to claim 2, characterized in that: The second switch module includes a second relay; a first end of the second relay is connected to a first end of the first contact, a second end of the second relay is connected to a second end of the second contact, and a control end of the second relay is connected to the control module.
6. The arc signal acquisition and testing device according to any one of claims 1 to 5, characterized in that: It also includes a current acquisition module, which is connected to the second contact head and is used to acquire the current signal output by the second contact head.
7. The arc signal acquisition and testing device according to claim 1, characterized in that: It also includes a base; the first contact head is fixed on the base, and the sliding module moves along the first direction on the base.
8. The arc signal acquisition and testing device according to claim 7, characterized in that: Also includes a first insulating clamp block and a second insulating clamp block; The first contact head is fixed on the base through the first insulating clamp block, and the second contact head is linked to the sliding module through the second insulating clamp block.
9. The arc signal acquisition and testing device according to claim 8, characterized in that: The sliding module includes a slider, a connecting rod and a button; The slider is linked to the second insulating clamp, the second insulating clamp is linked to the second contact head, the connecting rod is linked to the slider, and the button is linked to the connecting rod.
10. A photovoltaic system, characterized in that: It comprises at least two photovoltaic strings, an inverter and the arc signal acquisition and testing device according to any one of claims 1 to 9; Each first terminal of the arc signal acquisition and testing device is connected to the positive pole of the photovoltaic string, the second terminal of the arc signal acquisition and testing device is connected to the positive pole of the inverter, and the negative pole of the photovoltaic string is connected to the negative pole of the inverter.