Alternating current and direct current integrated detection framework of inverter system

Abstract

The utility model discloses an AC / DC integrated detection architecture of an inverter system. The AC / DC integrated detection architecture comprises a plurality of integrated sensors, an AFCI detection module and a DSP main control module, the integrated sensor comprises an alternating current detection module and a direct current detection module which share a magnetic core, and the direct current detection module and the alternating current detection module are matched to form a measurement channel through which a single wire passes; the AFCI detection module is suitable for being connected with all the alternating current detection modules, and then all the alternating current signals are received in real time so as to be used for AFCI arc fault monitoring. The DSP main control module is suitable for being connected with all the direct current detection modules so as to receive all the direct current signals in real time for MPPT control. The inverter has the advantages that the direct current detection module and the alternating current detection module are integrated into the same module, the number of hardware in the inverter is reduced, the system complexity and occupied space are reduced, and meanwhile the production and maintenance cost can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the current detection technical field, and particularly to an inverter system AC / DC integrated detection architecture. BACKGROUND

[0002] In the existing photovoltaic inverter design, independent DC current sensors and AC current sensors are usually used to meet the needs of MPPT control and AFCI protection respectively. Specifically, the MPPT module detects the output current of the photovoltaic module in real time through the DC current sensor to realize power optimization; and the AFCI module relies on the AC current sensor to monitor the current waveform change to detect possible arc faults and take protective measures.

[0003] Since the DC and AC current sensors are arranged in the MPPT and AFCI modules respectively, this separate design increases the internal structural complexity of the photovoltaic inverter, occupies more hardware resources, leads to high production and maintenance costs, and is not conducive to the miniaturization and light weight of the equipment; for application scenarios requiring compact layout, the prior art is difficult to meet the needs. In addition, the decentralized system is more complex in fault location and repair process, increasing the maintenance difficulty. CONTENT OF THE UTILITY MODEL

[0004] One of the purposes of the present application is to provide an inverter system AC / DC integrated detection architecture capable of solving at least one defect in the background art.

[0005] To achieve the above at least one purpose, the technical solution adopted by the present application is as follows: an inverter system AC / DC integrated detection architecture applied to the multi-path MPPT control and AFCI arc fault protection scenarios of an inverter system; comprising a plurality of integrated sensors, an AFCI detection module and a DSP master control module; the integrated sensor comprises an AC detection module and a DC detection module sharing a common magnetic core, the DC detection module and the AC detection module cooperate to form a measurement channel for passing through a single wire; the AFCI detection module is adapted to be connected with all the AC detection modules, thereby receiving all the AC signals in real time for AFCI arc fault monitoring; the DSP master control module is adapted to be connected with all the DC detection modules, thereby receiving all the DC signals in real time for MPPT control.

[0006] Preferably, the integrated sensor comprises a CT coil, a plurality of Hall elements and a plurality of C-shaped magnetic cores; the magnetic cores form the measurement channel through the central hole, and the plurality of magnetic cores are arranged close to each other on the side away from the air gap; the CT coil is wound around the close-together area of all the magnetic cores to cooperatively form the alternating current detection module; and the Hall elements are arranged at the air gap positions of the magnetic cores correspondingly, so that the Hall elements and the magnetic cores cooperatively form the direct current detection module.

[0007] Preferably, the number of the magnetic cores is two, and the two magnetic cores are symmetrically arranged close to each other; and the current directions of the two wires independently penetrating through the magnetic cores are in the same direction.

[0008] Preferably, the number of the magnetic cores is greater than two, and all the magnetic cores are arranged close to each other at equal intervals along the circumferential direction; and the current directions of the plurality of wires independently penetrating through the magnetic cores are in the same direction along the circumferential direction.

[0009] Preferably, the plurality of magnetic cores are arranged close to each other through an isolation structure, so that the adjacent magnetic cores are not in contact.

[0010] Preferably, the adjacent magnetic cores are arranged at intervals to form the isolation structure.

[0011] Preferably, the adjacent magnetic cores are connected through a shielding layer to form the isolation structure.

[0012] Preferably, the integrated sensor further comprises an alternating current signal conditioning module and a plurality of direct current signal conditioning modules; the direct current signal conditioning modules are adapted to receive the detection data of the direct current detection module and extract the direct current signal components; and the alternating current signal conditioning module is adapted to receive the detection data of the alternating current detection module and process the detection data, so as to obtain the alternating current signal containing the arc characteristic frequency band.

[0013] Preferably, the direct current signal conditioning module comprises an amplification circuit and a low-pass filter circuit connected in sequence; the amplification circuit is adapted to convert the Hall voltage generated by the Hall element into a current signal and amplify the current signal, and the low-pass filter circuit is adapted to filter the amplified current signal to extract the direct current signal components.

[0014] Preferably, the alternating current signal conditioning module comprises a conversion circuit and a band-pass filter circuit connected in sequence; the conversion circuit is adapted to convert the induced electromotive force generated by the CT coil into a current signal and amplify the current signal; and the band-pass filter circuit is adapted to filter the converted current signal to retain the current signal of the arc characteristic frequency band.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] (1) The integrated sensor has a simple structure. By integrating the DC and AC detection modules in the same module, the number of hardware inside the inverter is reduced, which reduces the system complexity and the occupied space, and also reduces the production and maintenance costs.

[0017] (2) By integrating the DC and AC detection modules, real-time synchronous acquisition and processing of the two signals can be realized, and the delay between the signals is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the integrated sensor.

[0019] Figure 2 Fig. 2 is a schematic diagram of the structure of one example of the integrated sensor.

[0020] Figure 3 Fig. 3 is an equivalent simplified schematic diagram of the integrated sensor shown in the present application. Figure 2

[0021] Figure 4 Fig. 4 is a schematic diagram of the structure of another example of the integrated sensor in the present application.

[0022] Figure 5 Fig. 5 is a schematic diagram of the wire installation structure when the integrated sensor shown in the present application performs current detection. Figure 4

[0023] Fig. 6 is a schematic diagram of the structure of the integrated sensor for outputting detection signals in the present application. Figure 6

[0024] Fig. 7 is a schematic diagram of the circuit architecture of the DC signal conditioning module in the present application. Figure 7

[0025] Fig. 8 is a schematic diagram of the circuit architecture of the AC signal conditioning module in the present application. Figure 8 In the figure: DC detection module 10, isolation structure 100, magnetic core 11, air gap 110, measurement channel 111, Hall element 12, CT coil 13, DC signal conditioning module 14, amplification circuit 141, low-pass filter circuit 142, AC signal conditioning module 15, conversion circuit 151, band-pass filter circuit 152, AC detection module 20, wire 30, AFCI detection module 41, DSP master control module 42, ARM control module 43, cloud 44.

[0026] DETAILED DESCRIPTION

[0027] ​​Hereinafter, the present application will be further described with reference to the specific embodiments, it should be noted that in the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0028] In the description of the present application, it should be noted that for orientation words such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0029] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0030] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be connected, or detachable, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In this application, unless specifically stated and limited otherwise, the term "on" or "under" of a first feature with respect to a second feature can include that the first and second features are directly in contact, or that the first and second features are not directly in contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0032] The terms "comprising" and "having" and any variations thereof in the specification and claims of this application are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or apparatus that includes a list of steps or units not necessarily limited to those explicitly listed, but can include other steps or units not expressly listed or inherent to such processes, methods, products or apparatus.

[0033] One preferred embodiment of the present application is shown in Figure 1 and Figure 2 An AC / DC integrated detection architecture of an inverter system applied to the multi-channel MPPT control and AFCI arc fault protection scenarios of the inverter system. It includes a plurality of integrated sensors, an AFCI detection module 41 and a DSP master control module 42. The integrated sensors include an AC detection module 20 and a DC detection module 10 sharing a magnetic core 11, the DC detection module 10 and the AC detection module 20 cooperating to form a measurement channel 11 for passing through a single wire 30, so that the DC detection module 10 and the AC detection module 20 can simultaneously detect the DC signal and the AC signal of the wire 30. The AFCI detection module 41 is connected with the AC signal output interface AC of all integrated sensors through a port, so as to receive all AC signals in real time for AFCI arc fault monitoring of the inverter system. The DSP master control module 42 can be connected with the DC signal output interface DC of all integrated sensors through an interface, so as to receive all DC signals in real time for MPPT control of the inverter system.

[0034] As known by those skilled in the art, the MPPT control of the inverter system needs to realize power optimization according to the DC information output by the power generation unit of the inverter system; and the AFCI arc fault protection needs to take protective measures for possible arc faults according to the current change waveform of the inverter system. That is, in the inverter system, in order to simultaneously realize MPPT control and AFCI arc fault protection, it is necessary to detect the AC / DC of the wire 30 on the power generation unit side of the inverter system.

[0035] For the traditional AC / DC detection method for MPPT control and AFCI arc fault protection, a DC current sensor is usually required to be configured for each current channel of the inverter system to ensure independent and accurate monitoring of the DC current of each channel. In addition, an AC current sensor is additionally required to be configured for each or multiple channels to monitor the high-frequency AC current of the arc. However, the DC current sensor and the AC current sensor are distributed in different channels and work independently, which makes the design have low integration and large space occupation, and the cost is also high.

[0036] In the embodiment, the magnetic cores 11 of the DC detection module 10 and the AC detection module 20 are shared, so that the DC detection module 10 and the AC detection module 20 can be integrated in one sensor structure, i.e., an integrated sensor. The structure of the integrated sensor is simple, so that the number of hardware inside the inverter can be reduced to reduce the system complexity and the occupied space, and the production and maintenance costs can also be reduced. At the same time, by integrating the DC detection module 10 and the AC detection module 20, real-time synchronous acquisition and processing of the AC and DC signals of the wire 30 can be realized, so that the delay between the signals is reduced to improve the AC / DC detection efficiency of the inverter system.

[0037] It can be understood that the DC detection module 10 based on the magnetic core 11 generally adopts a Hall sensor based on the Hall effect, and the AC detection module 20 based on the magnetic core 11 generally adopts a CT current sensor based on the electromagnetic induction principle. The integrated manner of the Hall sensor and the CT current sensor can be that a single Hall sensor is integrated with a single CT current sensor, so that a measurement channel 111 can be formed. Alternatively, multiple Hall sensors can be integrated with a single CT current sensor, so that multiple measurement channels 111 can be formed. In order to further reduce the number of hardware of the inverter to improve the integration of the system, the integrated manner of multiple Hall sensors and a single CT current sensor is preferred in the embodiment. For the convenience of understanding, the specific structure of the integrated sensor will be described in detail below.

[0038] In the embodiment, as shown in FIG. 1, the integrated sensor includes a magnetic core 11, a DC detection module 10 and an AC detection module 20. Figure 2 and Figure 3As shown, the integrated sensor includes a CT coil 13, a plurality of Hall elements 12 and a plurality of C-shaped magnetic cores 11. The plurality of magnetic cores 11 are arranged close to each other by one side away from the air gap 110, and the wire 30 to be detected can independently pass through a single magnetic core 11. The CT coil 13 is wound around the close-together area of all magnetic cores 11 to cooperatively form an alternating current detection module 20 for detecting alternating current of the wire 30. The Hall element 12 is correspondingly arranged at the air gap 110 of each magnetic core 11, so that the Hall element 12 and the magnetic core 11 cooperatively form a direct current detection module 10 for detecting direct current of the wire 30.

[0039] As known by those skilled in the art, the MPPT control of the inverter system needs to optimize power according to the direct current information output by the power generation unit of the inverter system; and the AFCI arc fault protection needs to take protective measures for possible arc faults according to the current change waveform of the inverter system. That is, in the inverter system, in order to simultaneously realize MPPT control and AFCI arc fault protection, the wire 30 on the power generation unit side of the inverter system needs to be detected for alternating current and direct current.

[0040] For the conventional alternating current and direct current detection method for MPPT control and AFCI arc fault protection, it is usually required that each current channel of the inverter system is separately configured with a direct current sensor to ensure independent and accurate monitoring of the direct current of each channel; at the same time, in order to monitor the high-frequency alternating current of the arc, each channel or multiple channels need to be additionally configured with an alternating current sensor. However, the above-mentioned direct current sensor and alternating current sensor are distributed in different channels and work independently, and are spaced apart from each other, so that the integration of this design is relatively low, the occupied space is relatively large, and the required cost is also relatively high.

[0041] In the present embodiment, the plurality of magnetic cores 11 are designed to be close to each other and are wound to form the alternating current detection module 20 for detecting high-frequency alternating current, and the Hall element 12 is installed at the air gap 110 of the magnetic core 11 to form the direct current detection module 10 for detecting direct current. The above-mentioned design has a simple structure, and the direct current detection module 10 and the alternating current detection module 20 can be integrated in the same sensor structure, thereby reducing the number of hardware inside the inverter to reduce system complexity and occupied space, and also reducing production and maintenance costs. Moreover, the plurality of magnetic cores 11 can form a plurality of efficient current measurement channels 111, thereby improving the integration of the system. At the same time, by integrating the direct current detection module 10 and the alternating current detection module 20, real-time synchronous acquisition and processing of alternating current and direct current signals of the wire 30 can be realized, thereby reducing the delay between signals to improve the alternating current and direct current detection efficiency of the inverter system.

[0042] It should be known that in order to ensure the uniform winding of the CT coil 13, the magnetic core 11 is provided with a C-shaped structure formed by the air gap 110 on one side of the "mouth" shaped structure. The specific number of the magnetic core 11 of the integrated sensor of the present application can be set according to actual needs; for example, if the number of the power generation units of the inverter system is large, the number of the magnetic core 11 of the single integrated sensor is large, so that as few hardware as possible is used to realize the AC / DC detection of the inverter system. However, if the number of the current measurement channels 111 formed by the single integrated sensor is too large, the adjacent measurement channels 111 will affect the installation of the wire 30 due to the too close distance. At the same time, the magnetic fields formed by the adjacent measurement channels 111 can also interfere with each other; therefore, the local arrangement of the integrated sensor formed by the magnetic core 11 with different numbers and the penetration mode of the wire 30 are different, which will be described in detail through two specific examples.

[0043] As shown in Figure 2 and Figure 3 , the number of the magnetic core 11 is two, and the two magnetic cores 11 are symmetrically arranged close to each other; the current directions of the two wires 30 independently penetrating the two magnetic cores 11 are the same.

[0044] It can be understood that when the integrated sensor shown in example one works, two currents pass through the respective wires 30 and the respective independent magnetic cores 11, and the respective magnetic fields are induced in the respective magnetic cores 11. The Hall element 12 installed at the position of the air gap 110 of each magnetic core 11 can independently measure the single current. The CT coil 13 shared by the two magnetic cores 11 can detect the magnetic field changes in the two magnetic cores 11 at the same time through the electromagnetic induction principle, so as to obtain the signal component of the alternating current, and the magnetic field directions in the two magnetic cores 11 are shown by the dotted arrows in Figure 1 Through the above design, the reliable separation and detection of the direct current and the alternating current are ensured, and the integrated design with compact structure and low mutual interference in the multi-channel current measurement is realized.

[0045] Example two: the number of the magnetic core 11 is greater than two, for example Figure 4 and Figure 5 , the number of the magnetic core 11 is four. All the magnetic cores 11 are symmetrically arranged close to each other along the circumferential direction; the current directions of the multiple wires 30 independently penetrating the magnetic cores 11 are the same along the circumferential direction.

[0046] It can be understood that the specific working principle of example two is basically the same as that of example one; compared with example one, example two can provide more direct current measurement channels 111. By arranging the direction of the wire 30 in the same circumferential direction, it can be ensured that the multiple wires 30 can be smoothly penetrated, thereby avoiding the disorder of the arrangement of the wire 30.

[0047] In this embodiment, as shown in Figure 1 and Figure 3 As shown, the plurality of magnetic cores 11 are arranged close to each other through the isolation structure 100, so that the adjacent magnetic cores 11 are not in contact, thereby reducing or avoiding mutual interference of the magnetic field on the adjacent magnetic cores 11.

[0048] It can be understood that if part or all of the magnetic cores 11 in the integrated sensor are arranged close to each other in mutual contact, the magnetic field generated by each magnetic core 11 through electromagnetic induction will have a cross-magnetic core 11 coupling effect in the close-together area, which will increase the current fluctuation amplitude of a single magnetic core 11 detected by the CT coil 13, which may cause false positives of AFCI arc faults. Therefore, when designing the integrated sensor, the isolation structure 100 needs to be arranged to isolate the adjacent magnetic cores 11 to ensure that the magnetic lines generated by each current only close in the corresponding magnetic core 11, thereby reducing or avoiding the occurrence of cross-magnetic core 11 coupling effect.

[0049] Specifically, there are many specific implementations of the isolation structure 100 that can achieve the above effects. The common methods mainly include the following two kinds. The first kind: the adjacent magnetic cores 11 are arranged at intervals to form the isolation structure 100; the second kind: the adjacent magnetic cores 11 are connected through a shielding layer to form the isolation structure 100. The specific material of the shielding layer is known to those skilled in the art, and therefore will not be described in detail here. It only needs to be able to isolate the electromagnetic field.

[0050] In this embodiment, as shown in Figure 6 The integrated sensor further includes an alternating current signal conditioning module 15 and a plurality of direct current signal conditioning modules 14. The number of direct current signal conditioning modules 14 is equal to the number of direct current detection modules 10 formed by the magnetic cores 11. The direct current signal conditioning module 14 can be connected to the corresponding direct current detection module 10, so as to receive the detection data of the direct current detection module 10 and extract the direct current signal component. The alternating current signal conditioning module 15 can be connected to the alternating current detection module 20, so as to receive the detection data of the alternating current detection module 20 and process it, and then obtain the alternating current signal containing the arc characteristic frequency band.

[0051] It can be understood that the direct current detection module 10 in this embodiment mainly relies on the Hall effect to convert the current signal in the wire 30 into a potential difference; the alternating current detection module 20 mainly relies on the principle of electromagnetic induction to convert the current signal in the wire 30 into an induced electromotive force. That is, the signals collected by the direct current detection module 10 and the alternating current detection module 20 are all voltage signals, and the required current signal cannot be directly obtained. It needs to be conditioned by the corresponding conditioning module to output the corresponding direct current signal and alternating current signal.

[0052] In this embodiment, the DC signal conditioning module 14 can amplify the signal data collected by the DC detection module 10 to ensure that the signal strength is suitable for subsequent measurement and analysis; at the same time, the DC signal conditioning module 14 can also filter the amplified signal to suppress noise and interference to obtain accurate DC signal components. The signal after amplification and filtering is more stable and has a higher signal-to-noise ratio, so that the actual current change can be more accurately reflected. The specific structure of the DC signal conditioning module 14 capable of achieving the above functions is various, in order to facilitate understanding, a specific structure will be described in detail below.

[0053] Specifically, as shown in Figure 7 The DC signal conditioning module 14 includes an amplification circuit 141 and a low-pass filter circuit 142 connected in sequence. The input end of the amplification circuit 141 can be connected with the Hall element 12, so that the Hall voltage generated by the Hall element 12 can be input into the amplification circuit 141 to be converted into a current signal and amplified. The low-pass filter circuit 142 can receive the amplified current signal and filter it to extract the DC signal component for easy MPPT control.

[0054] It should be understood that the specific structure and working principle of the amplification circuit 141 and the low-pass filter circuit 142 are known to those skilled in the art, and therefore will not be described in detail here.

[0055] In this embodiment, the AC signal conditioning module 15 can amplify the induced current signal sensed by the CT coil 13 to improve its amplitude and ensure that the subsequent detection unit can accurately read the signal. At the same time, the AC signal conditioning module 15 can also filter the amplified induced current signal to retain the signal of the arc characteristic frequency band; then after amplification and filtering, the AC signal conditioning module 15 can output an AC current signal containing the arc characteristic frequency band. The specific structure of the AC signal conditioning module 15 capable of achieving the above functions is various, in order to facilitate understanding, a specific structure will be described in detail below.

[0056] Specifically, as shown in Figure 8 The AC signal conditioning module 15 includes a conversion circuit 151 and a band-pass filter circuit 152 connected in sequence. The conversion circuit 151 can convert the induced electromotive force generated by the CT coil 13 into a current signal and amplify it. The band-pass filter circuit 152 can filter the converted current signal to retain the current signal of the arc characteristic frequency band, thereby facilitating AFCI arc fault judgment.

[0057] It can be understood that the basic structure of the amplification circuit 141 in the direct current signal conditioning module 14 and the conversion circuit 151 in the alternating current signal conditioning module 15 is consistent. Both of the two circuits can be regarded as a kind of signal amplification circuit, which can realize the conversion of voltage-current through the negative feedback mechanism while realizing signal amplification. The specific conversion process is known to those skilled in the art, and therefore will not be described in detail here.

[0058] In this embodiment, the integrated sensor can be designed for packaging. As shown in Figure 6 , the packaged integrated sensor has mounting holes corresponding to each magnetic core 11 to form a measurement channel 111, which can be used for the corresponding passage of the wire 30 to be detected. The packaged integrated sensor is provided with a power supply interface VCC, a common ground interface GND, a direct current signal output interface DC, and an alternating current signal output interface AC. Among them, the power supply interface VCC is used to connect the power supply to supply power to the alternating current signal conditioning module 15 and the direct current signal conditioning module 14; the common ground interface GND is used for grounding the alternating current signal conditioning module 15 and the direct current signal conditioning module 14; the direct current signal output interface DC is connected to the direct current signal conditioning module 14 to correspondingly output the direct current signal; the alternating current signal output interface AC is connected to the alternating current signal conditioning module 15 to output the corresponding alternating current signal.

[0059] It should be understood that the number of direct current signal output interfaces DC corresponds to the number of direct current signal conditioning modules 14, that is, the number of magnetic cores 11. Taking the above example one as an example, the number of direct current signal output interfaces DC is two, which can be marked as DC1 and DC2 respectively.

[0060] For the convenience of understanding, the following will take the above example one of the specific structure of the integrated sensor as an example to explain the whole working process of the present application. Taking the photovoltaic power generation system as an example, as shown in Figure 1 , since each integrated sensor contains two magnetic cores 11, the PV units of the photovoltaic power generation system can be divided into N groups every two; the output end wires 30 of the two PV units of each group pass through the two measurement channels 111 of the integrated sensor respectively. The alternating current signals output by all integrated sensors are AC #1 , AC #2 , …, AC #N respectively, and the AFCI detection module 41 judges the arc fault condition of the photovoltaic power generation system according to the received alternating current signals. The direct current signals output by all integrated sensors are DC #1_1 , DC #1_2 , DC #2_1 , DC #2_2 , …, DC #N_1 , DC #N_2The DSP main control module 42 performs MPPT control on the photovoltaic power generation system based on the received DC signal.

[0061] It should be understood that the specific structure and working principle of the AFCI detection module 41 and the DSP main control module 42 are well-known technologies to those skilled in the art, and therefore will not be described in detail here.

[0062] In this embodiment, as Figure 1 As shown, the AC / DC integrated detection architecture of the inverter system also includes an ARM control module 43. The ARM control module 43 can communicate with the DSP main control module 42 and the AFCI detection module 41, thereby receiving feedback results from the DSP main control module 42 and the AFCI detection module 41 and uploading them to the cloud 44 for remote monitoring, fault analysis and handling, thereby improving the system's safety and intelligence level. The specific structure and working principle of the ARM control module 43 are well known to those skilled in the art, and therefore will not be described in detail here.

[0063] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. An integrated DC-AC detection architecture for MPPT control and AFCI arc fault protection scenarios in an inverter system, comprising: The integrated sensor comprises: a plurality of C-shaped magnetic cores, the magnetic cores form the measurement channel through the central hole, and the plurality of magnetic cores are arranged close to each other on the side away from the air gap; a CT coil, the CT coil is wound around the close-together area of all the magnetic cores to form an AC detection module for detecting AC of the wire; and a plurality of Hall elements, the Hall elements are arranged at the air gap position of each magnetic core, so that the Hall elements and the magnetic cores form a DC detection module for detecting DC of the wire. The number of the magnetic cores is two, and the two magnetic cores are symmetrically arranged close to each other; the current directions of the two wires respectively independently passing through the two magnetic cores are in the same direction.

2. The inverter system AC-DC integrated detection architecture of claim 1, wherein, The number of the magnetic cores is greater than two, and all the magnetic cores are arranged close to each other at equal intervals along the circumferential direction; the current directions of the plurality of wires respectively independently passing through the magnetic cores are in the same direction along the circumferential direction. The plurality of magnetic cores are arranged close to each other through an isolation structure, so that the adjacent magnetic cores do not contact each other. The adjacent magnetic cores are arranged at intervals to form the isolation structure. The adjacent magnetic cores are connected through a shielding layer to form the isolation structure.

3. The inverter system AC-DC integrated detection architecture of claim 2, wherein, The integrated sensor further comprises:

4. The inverter system AC-DC integrated detection architecture of claim 2, wherein, a plurality of DC signal conditioning modules, the DC signal conditioning modules are adapted to receive the detection data of the DC detection module and extract the DC signal component; and 5. The inverter system AC-DC integrated detection architecture of claim 3 or 4, wherein, an AC signal conditioning module, the AC signal conditioning module is adapted to receive the detection data of the AC detection module and process the detection data, thereby obtaining an AC current signal containing an arc characteristic frequency band.

6. The inverter system AC-DC integrated detection architecture of claim 5, wherein, The DC signal conditioning module comprises an amplification circuit and a low-pass filter circuit connected in sequence; 7. The inverter system AC-DC integrated detection architecture of claim 5, wherein, The amplification circuit is adapted to convert the Hall voltage generated by the Hall element into a current signal and amplify the current signal, and the low-pass filter circuit is adapted to filter the amplified current signal to extract the DC signal component.

8. The inverter system AC-DC integrated detection architecture of claim 2, wherein, The AC signal conditioning module comprises a conversion circuit and a band-pass filter circuit connected in sequence; The conversion circuit is adapted to convert the induced electromotive force generated by the CT coil into a current signal and amplify the current signal; and the band-pass filter circuit is adapted to filter the converted current signal to retain the current signal of the arc characteristic frequency band. ​ 9. The inverter system AC-DC integrated detection architecture of claim 8, wherein, ​ ​ 10. The inverter system AC-DC integrated detection architecture of claim 8, wherein, ​ ​

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