CN117995538A - Magnetic integration device of photovoltaic system and photovoltaic system - Google Patents
Magnetic integration device of photovoltaic system and photovoltaic system Download PDFInfo
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- CN117995538A CN117995538A CN202410132118.3A CN202410132118A CN117995538A CN 117995538 A CN117995538 A CN 117995538A CN 202410132118 A CN202410132118 A CN 202410132118A CN 117995538 A CN117995538 A CN 117995538A
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Abstract
The application relates to a magnetic integration device of a photovoltaic system and the photovoltaic system, wherein the photovoltaic system comprises an AFCI detection circuit and a PLC communication circuit, wherein an AFCI current transformer is arranged in the AFCI detection circuit, a PLC current transformer is arranged in the PLC communication circuit, the AFCI current transformer and the PLC current transformer are arranged on the PV input side of the photovoltaic system, the AFCI current transformer and the PLC current transformer are integrated together to form the magnetic integration device, and the AFCI current transformer and the PLC current transformer share a magnetic core. The application can enable the PLC current transformer and the AFCI current transformer to share the magnetic core to form an integrated structure, and effectively reduce the occupied volume, weight and cost of the transformer on the premise of not affecting the functions.
Description
Technical Field
The invention relates to the technical field of photovoltaic control, in particular to a magnetic integration device of a photovoltaic system and the photovoltaic system.
Background
In the photovoltaic system, a power optimizer is arranged at each path of photovoltaic cell panel, the photovoltaic power optimizer can track the maximum power point of a single module in real time, and a user can select different types of power optimizers according to the actual running condition of the photovoltaic system, so that the problem of reduced power generation capacity of the photovoltaic system caused by shadow shielding, module orientation difference or inconsistent module attenuation is solved, the maximum power output and on-line monitoring of the single module are realized, and the system efficiency is improved. The power optimizer is connected to the photovoltaic inverter in a manner of direct current power line carrier communication (i.e., direct current PLC, PLC is collectively referred to as Power Line Communication, meaning power line carrier communication or power line communication, which means a communication method for transmitting data using a power transmission line as an information transmission medium), and the direct current PLC propagates through direct current output harnesses between the PV module and the photovoltaic inverter, and because the current on each output harness of the PV module is large, a specific coupling method is required to extract carrier signals on the direct current power line.
The circuit structure of the direct current PLC is generally composed of a CPU module, an auxiliary power supply, an AD sampling module, a PLC sensing module and a direct current carrier communication module, wherein the direct current carrier communication module adopts a current carrier mode to transmit signals. The circuit structure of the PLC sensing module is shown in fig. 1, and the PLC sensing module is composed of a PLC current transformer, a primary side capacitor C1 of the transformer, a secondary side capacitor C2 of the transformer, a resistor R1 and a PLC input voltage signal processing unit. The magnetic core of the current transformer adopts an iron powder core or a ferrite core, and the current transformer consists of a winding L1, a winding L2 and a winding L3, wherein the winding L3 is a PLC output signal, the output current signal outputs a PWM voltage signal with a certain frequency through a CPU module, the PWM voltage signal generates current with a corresponding frequency through a resistor R1 and the winding L3 of the PLC current transformer T1, and the current is transmitted through the winding L1 of the PLC current transformer T1 to finish the output of the PLC output signal; the winding L2 of the PLC current transformer T1 induces the change of an input current signal of the winding L1 to generate current with corresponding frequency, the induced current signal resonates with the capacitor C2 to enable the signal with the corresponding frequency to enter the PLC input voltage signal processing unit, and then the CPU module and the AD sampling module analyze the data of the signal. The setting of the direct current PLC in the photovoltaic system is that a group of direct current PLCs are arranged on an optimizer, and meanwhile, a group of direct current PLCs are also arranged on an inverter side, namely, each output wire harness of each PV component is required to be provided with the direct current PLC, and correspondingly, the PLC current transformer is required to be provided, so that the cost is high, the position and the space of the wire harness can be occupied by the setting of the PLC current transformer, the volume of the photovoltaic inverter is increased, and the requirement of light weight of equipment at present is contrary.
Disclosure of Invention
The invention aims to overcome at least one defect, and provides a magnetic integration device of a photovoltaic system and the photovoltaic system, which can enable a PLC current transformer and an AFCI current transformer to share a magnetic core to form an integrated structure, and effectively reduce the occupied volume, weight and cost of the transformer on the premise of not affecting the functions.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides a magnetic integration device of a photovoltaic system, which comprises an AFCI detection circuit and a PLC communication circuit, wherein an AFCI current transformer is arranged in the AFCI detection circuit, a PLC current transformer is arranged in the PLC communication circuit, and the AFCI current transformer and the PLC current transformer are arranged on the PV input side of the photovoltaic system, wherein the AFCI current transformer and the PLC current transformer are integrated together to form the magnetic integration device, and the AFCI current transformer and the PLC current transformer share a magnetic core.
According to one embodiment of the invention, the AFCI current transformer comprises a first induction coil, the PLC sensor comprises a second induction coil, and the first induction coil and the second induction coil are wound on the magnetic core.
According to one embodiment of the invention, the photovoltaic system comprises a PV assembly and a photovoltaic inverter, a direct current output wire harness of the PV assembly is connected to a PV input side of the photovoltaic inverter, the AFCI detection circuit and the PLC communication circuit are arranged on the PV input side, the direct current output wire harness passes through the magnetic core, the magnetic core senses current change of the direct current output wire harness to generate magnetic flux change, and the first induction coil and the second induction coil sense the magnetic flux change in the magnetic core to form induction current output.
According to one embodiment of the invention, the magnetic core is an E-shaped magnetic core, the direct current output wire harness passes through an opening of the E-shaped magnetic core, and the first induction coil and the second induction coil are wound on a center post of the E-shaped magnetic core.
According to one embodiment of the invention, the direct current output wire harness comprises a PV+ wire harness and a PV-wire harness, wherein the PV+ wire harness and the PV-wire harness respectively pass through openings on two sides of the center pillar.
According to one embodiment of the invention, the magnetic core is a ring-shaped magnetic core, the direct current output wire harness passes through an opening in the ring-shaped magnetic core, and the first induction coil and the second induction coil are wound on the ring-shaped magnetic core.
According to one embodiment of the invention, the magnetic integration device is provided with a first annular magnetic core and a second annular magnetic core, the direct current output wire harness comprises a PV+ wire harness and a PV-wire harness, the PV+ wire harness passes through the first annular magnetic core, the PV-wire harness passes through the second annular magnetic core, the first induction coil comprises two sections of coil windings respectively wound on the first annular magnetic core and the second annular magnetic core, and the second induction coil comprises two sections of coil windings respectively wound on the first annular magnetic core and the second annular magnetic core.
According to one embodiment of the invention, the material of the magnetic core is one of silicon steel, powder core, amorphous or ferrite.
In particular, the invention also provides a photovoltaic system comprising:
An AFCI detection circuit;
A PLC communication circuit;
A PV assembly;
The photovoltaic inverter is characterized in that the PV component is connected to a PV input side of the inverter through a direct-current output wire harness, and the AFCI detection circuit and the PLC communication circuit are arranged on the PV input side;
The magnetic integration device is arranged on the PV input side of the inverter and is used for providing an AFCI sampling signal for the AFCI detection circuit and a PLC sampling signal for the PLC communication circuit.
According to one embodiment of the invention, the AFCI detection circuit comprises an AFCI current transformer for sampling and an AFCI peripheral circuit for processing an AFCI sampling signal, and the PLC communication circuit comprises a PLC current transformer for sampling and a PLC peripheral circuit for processing a PLC sampling signal.
According to one embodiment of the invention, the frequency of the effective signal of the AFCI sampling signal is 2kHz to 100kHz.
According to one embodiment of the invention, the effective signal frequency of the PLC sampling signal is 2MHz to 12MHz.
Compared with the prior art, the magnetic integration device of the photovoltaic system and the photovoltaic system have the advantages that:
The magnetic integration device is arranged on the PV input side of a photovoltaic system, integrates the AFCI detection circuit and the current transformer in the PLC communication circuit on one magnetic core, realizes the sharing of the magnetic cores, and forms a whole in space, but compared with the traditional separately arranged AFCI current transformer and the PLC current transformer, the magnetic integration device can still have the same performance, can enable the current transformers of the two circuits to have smaller volume and weight, is more convenient in production process design, and also reduces the cost.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
Fig. 1 is a schematic diagram of a circuit structure of a PLC sensing module of the prior art;
FIG. 2 is a schematic illustration of an arrangement of a magnetic integration device in a photovoltaic system according to one embodiment of the invention;
FIG. 3 is a schematic diagram of a magnetic integrated device based on an E-core in accordance with one embodiment of the present invention;
FIG. 4 is a schematic diagram of a toroidal core based magnetic integration device according to another embodiment of the invention;
FIG. 5 is a schematic diagram of an arrangement of a magnetic integrated device in combination with peripheral circuitry according to one embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1:
The embodiment describes a magnetic integration device of a photovoltaic system, as shown in fig. 2 and 5, the photovoltaic system comprises an AFCI detection circuit and a PLC communication circuit, wherein an AFCI current transformer is arranged in the AFCI detection circuit, a PLC current transformer is arranged in the PLC communication circuit, the AFCI current transformer and the PLC current transformer are arranged on a PV input side of the photovoltaic system, the AFCI current transformer and the PLC current transformer are integrated together to form the magnetic integration device, and the AFCI current transformer and the PLC current transformer share a magnetic core.
The AFCI (Arc-Fault Circuit-Interrupter, which means Arc Fault breaking) detection Circuit is a Circuit for Arc Fault breaking detection of an output wire harness of a PV assembly, wherein the arranged AFCI current transformer is used for detecting electric arcs possibly generated in the output wire harness in an induction way to form an AFCI Arc noise induction current signal, and is combined with an AFCI peripheral Circuit to complete comparison and analysis of the AFCI Arc noise induction current signal, so that the analysis of whether Arc faults exist or not is finally realized by identifying the Arc Fault characteristic signal, and finally, a protection Circuit of a power Circuit is disconnected before the Arc faults develop into fires or the Circuit is short-circuited.
The application relates to a PLC (totally called Power Line Communication Circuit, meaning power carrier communication), a PLC communication circuit uses a power line as a transmission medium, and the application refers to that the output wire harness of a PV component is used for realizing high-speed transmission of communication signals in a carrier mode, so that the communication signals which are supposed to be weak current can be transmitted on a power line, thereby realizing the fusion of a power system and the communication system, wherein the set PLC current transformer senses and detects the carrier communication signals in the output wire harness, and the PLC communication based on the power line (output wire harness) between the PV component and an inverter is finally realized by combining with a PLC peripheral circuit to complete modulation or demodulation of the carrier communication signals.
It can be understood that in this embodiment, the AFCI detecting circuit and the current transformer in the PLC communication circuit are integrated on one magnetic core, so as to realize the core sharing, and form a whole in space, and in general, the frequency of the effective signal of the arc signal obtained by sampling the AFCI current transformer is 2kHz to 100kHz, and the frequency of the effective signal of the communication signal obtained by sampling the PLC current transformer is 2MHz to 12MHz, and the shared magnetic core does not generate crosstalk to the signal detection of the two.
Compared with the traditional separately arranged AFCI current transformer and PLC current transformer, the AFCI current transformer and the PLC current transformer formed by the magnetic integrated device can still have the same performance, the application can enable the current transformers of the two circuits to have smaller volume and weight, and the application is more convenient in production process design and lower in cost.
In one embodiment, the AFCI current transformer comprises a first induction coil, the PLC sensor comprises a second induction coil, and the first induction coil and the second induction coil are wound on the magnetic core. The photovoltaic system generally may include a PV assembly and a photovoltaic inverter, a dc output harness of the PV assembly is connected to a PV input side of the photovoltaic inverter, the AFCI detection circuit and the PLC communication circuit are disposed on the PV input side, the dc output harness passes through the magnetic core, the magnetic core senses a current change of the dc output harness to generate a magnetic flux change, and the magnetic flux change in the magnetic core is sensed by the first induction coil and the second induction coil to form an induced current output.
The first induction coil and the second induction coil can share one coil to complete signal acquisition, and respective frequency signals are selected by filtering in an AFCI peripheral circuit and a PLC peripheral circuit, for example, effective signals of the AFCI sampling signals with the frequencies of 2kHz to 100kHz are selected after the filtering of the AFCI peripheral circuit, and effective signals of the PLC sampling signals with the frequencies of 2MHz to 12MHz are selected after the filtering of the PLC peripheral circuit.
The magnetic core used in the present application may be generally two kinds, one is an E-type magnetic core and the other is a toroidal magnetic core.
In one embodiment, as shown in fig. 3, the magnetic core is an E-shaped magnetic core, the direct current output wire harness passes through an opening of the E-shaped magnetic core, the first induction coil 1-2 and the second induction coil 3-4 are wound on a center pillar of the E-shaped magnetic core, the direct current output wire harness comprises a PV+ wire harness 9-10 and a PV-wire harness 11-12, and the PV+ wire harness 9-10 and the PV-wire harness 11-12 respectively pass through openings on two sides of the center pillar of the E-shaped magnetic core. The first induction coil 1-2 is used for outputting an AFCI arc noise induction current signal, and the second induction coil 3-4 is used for outputting a carrier communication signal of PLC communication.
In another embodiment, as shown in fig. 4, the magnetic core is a ring-shaped magnetic core, the direct current output wire harness passes through an opening in the ring-shaped magnetic core, and the first induction coil and the second induction coil are wound on the ring-shaped magnetic core.
In one embodiment, the magnetic integration device is provided with a ring-shaped magnetic core, the direct current output wire harness (PV+ wire harness and PV-wire harness) passes through an opening in the ring-shaped magnetic core, the first induction coil and the second induction coil are wound on the ring-shaped magnetic core, the first induction coil is used for outputting an AFCI arc noise induction current signal, and the second induction coil is used for outputting a carrier communication signal of PLC communication.
In another embodiment, two annular magnetic cores are arranged in the magnetic integration device, positive and negative wire harnesses respectively penetrate through one annular magnetic core, and two groups of induction coils are respectively arranged on each annular magnetic core. Specifically, as shown in fig. 4, the magnetic integration device is provided with a first annular magnetic core and a second annular magnetic core, the direct current output wire harness comprises a PV+ wire harness 9-10 and a PV-wire harness 11-12, the PV+ wire harness 9-10 passes through the first annular magnetic core, the PV-wire harness 11-12 passes through the second annular magnetic core, and the first induction coil comprises two sections of coil windings, namely coil windings 5-6 wound on the coil windings 1-2 of the first annular magnetic core and the second annular magnetic core respectively; the second induction coil also comprises two sections of coil windings, namely coil windings 3-4 wound on the first annular magnetic core and coil windings 7-8 wound on the second annular magnetic core.
When current characteristic ripples of the arc fault signal flow through the annular magnetic cores through the PV+ wiring harness 9-10 and the PV-wiring harness 11-12, magnetic flux phi T1 is generated on the first annular magnetic core and the second annular magnetic core, the magnetic flux phi T1 is induced by the coil windings 1-2 of the first annular magnetic core and the coil windings 5-6 on the second annular magnetic core, and the current characteristic ripples of the arc fault signal can be sampled by sequentially connecting the coil windings 1-2 of the first annular magnetic core and the coil windings 5-6 on the second annular magnetic core end to end in a certain mode, and finally the AFCI arc noise induction current signal is output.
In AFCI detection, it mainly detects differential mode current components and suppresses common mode disturbance components. Because the differential mode current is consistent with the current direction in the wire harness, and the PV+ wire harness 9-10 and the PV-wire harness 11-12 respectively pass through the first annular magnetic core and the second annular magnetic core in the same direction, and because the current directions in the PV+ wire harness 9-10 and the PV-wire harness 11-12 are opposite, the differential mode current directions in the two coil windings of the first induction coil are also opposite, and therefore the homonymous ends of the coil windings 1-2 and the homonymous ends of the coil windings 5-6 are required to be reversely connected, so that the effects of differential mode enhancement and common mode suppression are achieved.
When current with a direct current PLC carrier signal flows through the first annular magnetic core and the second annular magnetic core through the PV+ wiring harness 9-10 and the PV-wiring harness 11-12, magnetic flux phi T2 is generated on the first annular magnetic core and the second annular magnetic core, the magnetic flux phi T2 is induced by the coil windings 3-4 of the first annular magnetic core and the coil windings 7-8 on the second annular magnetic core, and the sampling of the PLC carrier signal can be realized by connecting the coil windings 3-4 of the first annular magnetic core and the coil windings 7-8 on the second annular magnetic core to a PLC peripheral circuit of a PLC communication circuit, so that the carrier communication signal for outputting the PLC communication can be output.
Above, AFCI current transformer and current PLC transformer pass through the ripple signal on annular magnetic core detection pencil, and magnetic core utilization ratio is high, and whole size is little.
Regardless of the magnetic core, the purpose is to integrate the AFCI current transformer and the PLC current transformer together to form a magnetic integrated device, and the AFCI current transformer and the PLC current transformer share the magnetic core, which is limited by the protection.
The material of the magnetic core can be silicon steel, powder core, amorphous or ferrite.
Example 2:
This embodiment describes a photovoltaic system, as shown in fig. 2, comprising:
An AFCI detection circuit;
A PLC communication circuit;
A PV assembly;
The photovoltaic inverter is characterized in that the PV component is connected to a PV input side of the inverter through a direct-current output wire harness, and the AFCI detection circuit and the PLC communication circuit are arranged on the PV input side;
The magnetic integration device of embodiment 1, disposed on a PV input side of the inverter, for providing an AFCI sampling signal for the AFCI detection circuit and a PLC sampling signal for the PLC communication circuit.
Generally, the AFCI detection circuit includes an AFCI current transformer for sampling and an AFCI peripheral circuit for processing an AFCI sampling signal, and the PLC communication circuit includes a PLC current transformer for sampling and a PLC peripheral circuit for processing a PLC sampling signal. The AFCI peripheral circuit for filtering, amplifying, comparing and processing and controlling the signal of the arc noise induced current of the acquired AFCI may be a circuit in the prior art, and similarly, the PLC peripheral circuit for filtering, modulating or demodulating the signal of the carrier communication of the acquired PLC may also be a circuit in the prior art, and the circuit selection of the above AFCI peripheral circuit and the PLC peripheral circuit is not a design focus of the present application and is not described herein.
In addition, the frequency of the effective signal of the AFCI sampling signal is 2kHz to 100kHz, and the frequency of the effective signal of the PLC sampling signal is 2MHz to 12MHz. Therefore, the frequencies of the effective signals of the AFCI sampling signal and the PLC sampling signal are different, and error detection or crosstalk between signals can be avoided through filtering or phase locking and other processing during subsequent signal acquisition and processing. According to the frequency characteristics, the first induction coil and the second induction coil described in embodiment 1 can share one coil to complete signal acquisition, and the AFCI peripheral circuit and the PLC peripheral circuit can select respective frequency signals through filtering, for example, the AFCI peripheral circuit selects an effective signal of the AFCI sampling signal with the frequency of 2kHz to 100kHz after filtering, and the PLC peripheral circuit selects an effective signal of the PLC sampling signal with the frequency of 2MHz to 12MHz after filtering.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (12)
1. The utility model provides a photovoltaic system's magnetism integrated device, photovoltaic system includes AFCI detection circuit and PLC communication circuit, be provided with AFCI current transformer in the AFCI detection circuit, be provided with the PLC current transformer in the PLC communication circuit, AFCI current transformer with the PLC current transformer sets up in photovoltaic system's PV input side, its characterized in that, AFCI current transformer with the PLC current transformer is integrated together and is constituted magnetism integrated device, and AFCI current transformer with the PLC current transformer sharing magnetic core.
2. The magnetic integration device of a photovoltaic system of claim 1, wherein the AFCI current transformer comprises a first induction coil and the PLC sensor comprises a second induction coil, the first and second induction coils wound on the magnetic core.
3. The magnetic integration device of a photovoltaic system of claim 2, wherein the photovoltaic system comprises a PV module and a photovoltaic inverter, a dc output harness of the PV module is connected to a PV input side of the photovoltaic inverter, the AFCI detection circuit and the PLC communication circuit are disposed on the PV input side, the dc output harness passes through the magnetic core, the magnetic core senses a change in current of the dc output harness to generate a change in magnetic flux, and the first and second induction coils sense the change in magnetic flux in the magnetic core to generate an induced current output.
4. The magnetic integration device of the photovoltaic system according to claim 3, wherein the magnetic core is an E-shaped magnetic core, the direct current output wire harness passes through an opening of the E-shaped magnetic core, and the first induction coil and the second induction coil are wound on a center post of the E-shaped magnetic core.
5. The device of claim 4, wherein the dc output harness comprises a pv+ harness and a PV-harness, the pv+ harness and the PV-harness passing through openings on both sides of the center pillar, respectively.
6. A magnetic integration device of a photovoltaic system according to claim 3, wherein the magnetic core is a toroidal magnetic core, the dc output harness passes through an opening in the toroidal magnetic core, and the first and second induction coils are wound on the toroidal magnetic core.
7. The magnetic integration device of a photovoltaic system according to claim 6, wherein a first toroidal core and a second toroidal core are provided in the magnetic integration device, the dc output harness includes a pv+ harness and a PV-harness, the pv+ harness passes through the first toroidal core, the PV-harness passes through the second toroidal core, the first induction coil includes two coil windings wound on the first toroidal core and the second toroidal core, respectively, and the second induction coil includes two coil windings wound on the first toroidal core and the second toroidal core, respectively.
8. The magnetic integration device of a photovoltaic system of any of claims 1 to 7, wherein the material of the magnetic core is one of silicon steel, powder core, amorphous or ferrite heavy.
9. A photovoltaic system, comprising:
An AFCI detection circuit;
A PLC communication circuit;
A PV assembly;
The photovoltaic inverter is characterized in that the PV component is connected to a PV input side of the inverter through a direct-current output wire harness, and the AFCI detection circuit and the PLC communication circuit are arranged on the PV input side;
The magnetic integration device of any one of claims 1 to 8, disposed on a PV input side of the inverter, for providing an AFCI sampling signal for the AFCI detection circuit and a PLC sampling signal for the PLC communication circuit.
10. The photovoltaic system of claim 9, wherein the AFCI detection circuit comprises an AFCI current transformer for sampling and an AFCI peripheral circuit that processes AFCI sampled signals, and the PLC communication circuit comprises a PLC current transformer for sampling and a PLC peripheral circuit that processes PLC sampled signals.
11. The photovoltaic system of claim 10, wherein the AFCI sampling signal has an effective signal frequency of 2kHz to 100kHz.
12. The photovoltaic system of claim 10, wherein the PLC sampling signal has a frequency of an effective signal of 2MHz to 12MHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410132118.3A CN117995538A (en) | 2024-01-30 | 2024-01-30 | Magnetic integration device of photovoltaic system and photovoltaic system |
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| CN202410132118.3A CN117995538A (en) | 2024-01-30 | 2024-01-30 | Magnetic integration device of photovoltaic system and photovoltaic system |
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| CN202410132118.3A Pending CN117995538A (en) | 2024-01-30 | 2024-01-30 | Magnetic integration device of photovoltaic system and photovoltaic system |
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