CN221614975U - Power line communication device, power equipment and photovoltaic system - Google Patents
Power line communication device, power equipment and photovoltaic system Download PDFInfo
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- CN221614975U CN221614975U CN202322405932.1U CN202322405932U CN221614975U CN 221614975 U CN221614975 U CN 221614975U CN 202322405932 U CN202322405932 U CN 202322405932U CN 221614975 U CN221614975 U CN 221614975U
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
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Abstract
本申请提供了一种电力线通信装置，包括设置于第一电力设备的第一调制电路、设置于第二电力设备的第二调制电路和接地网，第一电力设备与第二电力设备通过电力线连接，第一调制电路和第二调制电路分别通过第一信号耦合器件和第二信号耦合器件耦合至接地网，第一调制电路耦合的调制信号通过电力线和接地网传输至第二调制电路。将不传输电能的接地网作为信号传输通道，不会产生大电流，提高了传输信号的可靠性。
The present application provides a power line communication device, including a first modulation circuit arranged in a first power device, a second modulation circuit arranged in a second power device and a grounding network, the first power device and the second power device are connected through a power line, the first modulation circuit and the second modulation circuit are coupled to the grounding network through a first signal coupling device and a second signal coupling device respectively, and the modulation signal coupled by the first modulation circuit is transmitted to the second modulation circuit through the power line and the grounding network. Using a grounding network that does not transmit electric energy as a signal transmission channel will not generate a large current, thereby improving the reliability of the transmitted signal.
Description
Technical Field
Embodiments of the present application relate to power line communication technologies, and in particular, to a power line communication device, a power apparatus, and a photovoltaic system including the power line communication device.
Background
With the development of power electronics, the generation of electric energy by using a novel energy source is widely used. Existing solar photovoltaic systems generally include various power devices for generating electric energy such as a direct current electric energy generating device (e.g., a photovoltaic array), an inverter, and the like, and converting the electric energy. Typically, the power devices are spaced apart a long distance (e.g., 1km between the dc power generation device and the inverter). For signal interaction between remote devices, PLC (power line communication ) is generally used for signal transmission.
In related PLC signal transmission, a magnetic loop is generally disposed on a power line to couple a signal to the power line, or the magnetic loop is used to increase input/output impedance between two power lines to reduce signal attenuation. While power lines typically transmit power while transmitting modulated signals. The electrical energy generally has a relatively high current. Under the condition of large through flow, the magnetic induction intensity of the magnetic ring reaches the maximum value quickly, so that the magnetic ring is saturated, the inductance of the magnetic ring is greatly attenuated, the PLC signal is attenuated, and the reliability of signal transmission is reduced. Thus, how to improve the reliability of PLC signal transmission in a power line communication device becomes a problem.
Disclosure of utility model
The application provides a power line communication device which is used for communication among a plurality of power equipment, utilizes a grounding grid and a power cable to construct a differential transmission channel to transmit PLC signals, and uses the grounding grid as a signal transmission channel because the grounding grid does not transmit electric energy, so that large current can not be generated, the safety, the capacity or the volume requirement of a signal coupling device can be effectively reduced, the reliability of transmitted signals is improved, and the space and the cost of a power system are saved.
In a first aspect, a power line communication apparatus is provided, where the power line communication apparatus includes a first modulation circuit disposed on a first power device, a second modulation circuit disposed on a second power device, a first signal coupling device disposed on the first power device side, and a second signal coupling device disposed on the second power device side, where the first signal coupling device and the second signal coupling device are any one of a magnetic loop, an inductance, and a capacitance; the first power equipment is connected with the second power equipment through a power line; the first signal coupling device and the second signal coupling device are respectively coupled to a grounding grid; the power line on the side of the first power equipment is coupled to the grounding grid through the first signal coupling device, and the power line on the side of the second power equipment is coupled to the grounding grid through the second signal coupling device; the modulated signal coupled by the first modulation circuit is transmitted to the second modulation circuit through the power line and the ground network.
In the above embodiment of the present application, by coupling the signal coupling device to the ground network, since the ground network does not transmit electric power, or the current value in the ground network is generally small, a large current is not generated at the signal coupling device. When capacitive coupling is adopted, the design of the capacitor is not required by safety regulations, capacitance values and the like. And when electromagnetic coupling is adopted, the arrangement does not generate large current, so that the inductance of the magnetic ring or the inductor is suddenly reduced, and the signal is attenuated. Therefore, the above arrangement can enhance the stability of the transmission of the PLC signal. And the requirements on the volume or capacity, safety regulations and the like of the signal coupling device are reduced, so that the original cost of the power equipment is saved, the volume space is reduced, and the safety performance of the power equipment is improved.
With reference to the first aspect, in an implementation manner of the first aspect, an input/output terminal of the first modulation circuit is coupled to the first signal coupling device; the modulated signal is coupled to the power line and the ground network through the first signal coupling device, and is transmitted by the first power device to the second power device. And a signal loop is formed between the grounding network and the power line, so that signal transmission between the first power equipment and the second power equipment is completed, and a large current is not generated at a signal coupling device in the signal transmission process, so that the transmission stability of the PLC signal is enhanced.
With reference to the first aspect, in an implementation manner of the first aspect, an input/output terminal of the second modulation circuit is coupled to the second signal coupling device; the second modulation circuit receives the modulated signal from the ground network and the power line through the second signal coupling device.
With reference to the first aspect, in an implementation manner of the first aspect, the first signal coupling device and the second signal coupling device are magnetic rings, a first input/output end of the first modulation circuit is connected to a second input/output end of the first modulation circuit through the first signal coupling device, and a first input/output end of the second modulation circuit is connected to a second input/output end of the second modulation circuit through the second signal coupling device; the ground wire of the first power equipment passes through the first signal coupling device, and the ground wire of the second power equipment passes through the second signal coupling device. The magnetic ring or the inductor is arranged on the grounding grid which is coupled to the power transmission network, so that the magnetic saturation speed of the magnetic ring can be effectively reduced, the magnetic ring can keep high inductance, the attenuation of PLC signals is reduced, and the reliability of PLC signal transmission is improved.
With reference to the first aspect, in an implementation manner of the first aspect, the first signal coupling device and the second signal coupling device are respectively coupled to the power line through capacitance. The capacitor is used as a signal transmission channel between the signal coupling device and the power line, so that the stability of signal transmission is improved.
With reference to the first aspect, in an implementation manner of the first aspect, the power line includes at least two cables; the first signal coupling device and the second signal coupling device are coupled to the same cable of the at least two cables through a first capacitor and a second capacitor respectively, wherein the same cable is one or more cables of the at least two cables. The first capacitor and the second capacitor may serve as signal paths, and may transmit or receive the modulated signals of the first signal coupling device and the power line, respectively. The distributed capacitance, the distributed inductance and the like of each power line can be reduced, and the stability of the debugging signal is improved.
With reference to the first aspect, in one implementation manner of the first aspect, the first power device is an MPPT combiner box, the second power device is an inverter, the power line is used for transmitting dc power, the first signal coupling device and the second signal coupling device are magnetic rings, and the first signal coupling device and the second signal coupling device are coupled to a positive cable in the power line through a first capacitor and a second capacitor, respectively.
With reference to the first aspect, in an implementation manner of the first aspect, the first power device is an MPPT combiner box, the second power device is an inverter, the power line is used for transmitting dc power, the first signal coupling device and the second signal coupling device are magnetic rings, and the first signal coupling device and the second signal coupling device are coupled to a negative cable in the power line through a third capacitor and a fourth capacitor, respectively.
With reference to the first aspect, in one implementation manner of the first aspect, the first power device is a data collector, the second power device is an inverter, the power line is used for transmitting ac power, the first signal coupling device and the second signal coupling device are magnetic rings, and the first signal coupling device and the second signal coupling device are coupled to an L-phase cable in the power line through a first capacitor and a second capacitor, respectively.
With reference to the first aspect, in an implementation manner of the first aspect, the first power device is a data collector, the second power device is an inverter, the power line is used for transmitting ac power, the first signal coupling device and the second signal coupling device are magnetic rings, and the first signal coupling device and the second signal coupling device are coupled to an N-phase cable in the power line through a third capacitor and a fourth capacitor, respectively.
With reference to the first aspect, in an implementation manner of the first aspect, the power line includes at least two cables; the first signal coupling device and the second signal coupling device are coupled to different ones of the at least two cables by a first capacitance and a second capacitance, respectively.
The above embodiment of the application shows that the signal coupling device and the power line have different connection modes, and shows that the power line communication device provided by the embodiment of the application has various forms. And the method can be applied to an alternating current PLC communication scene and a direct current PLC communication scene, and has rich and flexible application scenes and high safety.
With reference to the first aspect, in an implementation manner of the first aspect, the first signal coupling device and the second signal coupling device are inductors, a first input/output end of the first modulation circuit is connected to one end of a first inductor, the other end of the first inductor is connected to the ground network, a first input/output end of the second modulation circuit is connected to one end of a second inductor, and the other end of the second inductor is connected to the ground network.
With reference to the first aspect, in an implementation manner of the first aspect, the first signal coupling device and the second signal coupling device are capacitors, a first input/output end of the first modulation circuit is connected to one end of a fifth capacitor, the other end of the fifth capacitor is connected and coupled to the ground network, a first input/output end of the second modulation circuit is connected to one end of a sixth capacitor, and the other end of the sixth capacitor is connected to the ground network. Because the signal coupling device is coupled to the grounding grid, the grounding grid does not have electric energy transmission, so that the safety and capacitance requirements on the capacitor in the capacitive coupling are loose, and the flexibility and the safety of the power equipment are enhanced.
With reference to the first aspect, in an implementation manner of the first aspect, the second input/output end of the first modulation circuit and the second input/output end of the second modulation circuit are respectively coupled to the power line through capacitors, that is, the second input/output end of the first modulation circuit is connected to one end of a seventh capacitor, the other end of the seventh capacitor is connected to the power line, the second input/output end of the second modulation circuit is connected to one end of an eighth capacitor, and the other end of the eighth capacitor is connected to the power line.
With reference to the first aspect, in an implementation manner of the first aspect, the power line includes at least two cables; the second input/output end of the first modulation circuit and the second input/output end of the second modulation circuit are coupled to the same cable of the at least two cables through a seventh capacitor and an eighth capacitor, respectively, wherein the same cable is one or more cables of the at least two cables.
With reference to the first aspect, in an implementation manner of the first aspect, the first power device is an MPPT combiner box, the second power device is an inverter, the power line is used for transmitting dc power, and the second input/output end of the first modulation circuit and the second input/output end of the second modulation circuit are coupled to a positive cable in the power line through a seventh capacitor and an eighth capacitor, respectively.
With reference to the first aspect, in an implementation manner of the first aspect, the first power device is an MPPT combiner box, the second power device is an inverter, the power line is used for transmitting dc power, and the second input/output end of the first modulation circuit and the second input/output end of the second modulation circuit are coupled to a negative cable in the power line through a seventh capacitor and an eighth capacitor, respectively.
With reference to the first aspect, in an implementation manner of the first aspect, the first power device is a data collector, the second power device is an inverter, the power line is used for transmitting ac power, and the second input/output end of the first modulation circuit and the second input/output end of the second modulation circuit are coupled to an L-phase cable in the power line through a ninth capacitor and a tenth capacitor, respectively.
With reference to the first aspect, in an implementation manner of the first aspect, the first power device is a data collector, the second power device is an inverter, the power line is used for transmitting ac power, and the second input/output end of the first modulation circuit and the second input/output end of the second modulation circuit are coupled to an N-phase cable in the power line through a ninth capacitor and a tenth capacitor, respectively.
With reference to the first aspect, in an implementation manner of the first aspect, a modulation circuit is coupled to the power line through a signal coupling device, and the signal coupling device is coupled to the ground network through a capacitor, where the modulation circuit includes the first modulation circuit and the second modulation circuit, and the signal coupling device includes the first signal coupling device and the second signal coupling device.
With reference to the first aspect, in an implementation manner of the first aspect, when the signal coupling device is a magnetic ring, the power line includes a positive cable and a negative cable, and the positive cable and the negative cable pass through the magnetic ring. Because the current directions of the positive cable and the negative cable are opposite, the magnetic flux generated by the positive cable and the negative cable can be counteracted, so that the magnetic ring is prevented from reaching magnetic saturation, the attenuation of the PLC signal is reduced, and the reliability of the PLC signal transmission is enhanced. Or the power line comprises an L-phase cable and an N-phase cable, and the L-phase cable passes through the magnetic ring.
In a second aspect, the application provides a power device, which comprises a modulation circuit, a signal coupling device and a power line, wherein the power device receives electric energy transmitted by other power devices through the power line, the modulation circuit is coupled to a grounding grid through the signal coupling device, and the modulation circuit receives PLC signals transmitted by other power devices through the power line and the grounding grid through the signal coupling device, and the signal coupling device is any one of a magnetic ring, an inductor and a capacitor.
With reference to the second aspect, in an implementation manner of the second aspect, the signal coupling device is a magnetic loop or an inductor, and the signal coupling device is coupled to the power line through capacitance.
With reference to the second aspect, in an implementation manner of the second aspect, the signal coupling device is a capacitor, the first input/output end of the modulation circuit is coupled to the ground network through a first capacitor, and the second input/output end of the modulation circuit is coupled to the power line through a second capacitor.
In a third aspect, the present application provides a photovoltaic system, which includes a plurality of electric devices, the power line communication device according to the first aspect is disposed between each two electric devices, wherein a medium-high frequency signal between each two electric devices is transmitted by using a power line erected therebetween.
In particular, electrical devices include, but are not limited to: photovoltaic module, dc-to-ac converter become, transformer, collection flow box, data acquisition ware. A power line communication device according to the first or second aspect may be provided between a photovoltaic module and an inverter, and medium-high frequency signals between the photovoltaic array and the inverter are transmitted using a power line interposed therebetween. A power line communication device according to the first or second aspect may be provided between a transformer and the inverter; the medium-high frequency signals between the inverter and the transformer are transmitted by using a power line erected between the inverter and the transformer. A power line communication device according to the first or second aspect may be provided between a photovoltaic array and the junction box, and medium-high frequency signals between the photovoltaic array and the junction box are transmitted by a power line interposed therebetween. The power line communication device according to the first or second aspect may be provided between a junction box and the inverter, and power line transmission may be provided between the junction box and the inverter. The data monitor is used for monitoring data of the photovoltaic array and the inverter; a power line communication device according to the first or second aspect is provided between the data monitor and at least one of the photovoltaic array and the inverter.
The electrical device provided in the second aspect of the present application and the photovoltaic system provided in the third aspect of the present application may refer to the discussion about the beneficial effects of the first aspect, and will not be repeated here.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a photovoltaic system according to an embodiment of the present application;
FIG. 2 is a schematic view of another configuration of a photovoltaic system according to an embodiment of the present application;
FIG. 3 is a schematic view of another configuration of a photovoltaic system according to an embodiment of the present application;
fig. 4 is a schematic diagram of a prior art power line communication device;
fig. 5 is a schematic structural diagram of a power line communication device according to an embodiment of the present application;
Fig. 6 is a schematic diagram of still another structure of a power line communication apparatus according to an embodiment of the present application;
fig. 7 is a schematic diagram of still another structure of the power line communication apparatus according to the embodiment of the present application;
fig. 8 is a schematic diagram of still another structure of a power line communication apparatus according to an embodiment of the present application;
fig. 9 is a schematic diagram of still another structure of a power line communication apparatus according to an embodiment of the present application;
fig. 10 is a schematic diagram of still another structure of the power line communication apparatus according to the embodiment of the present application;
Fig. 11 is a schematic diagram of still another structure of a power line communication apparatus according to an embodiment of the present application;
fig. 12 is a schematic diagram of still another structure of the power line communication apparatus according to the embodiment of the present application;
Fig. 13 is a schematic diagram of still another structure of the power line communication apparatus according to the embodiment of the present application;
fig. 14 is a schematic view of still another structure of the power line communication apparatus according to the embodiment of the present application;
Fig. 15 is a schematic view of still another structure of the power line communication apparatus according to the embodiment of the present application;
Fig. 16 is a schematic diagram of still another configuration of a power line communication apparatus according to an embodiment of the present application;
fig. 17 is a schematic diagram of still another configuration of a power line communication apparatus according to an embodiment of the present application;
Fig. 18 is a schematic structural view of an electrical device according to an embodiment of the present application;
fig. 19 is a schematic structural view of a photovoltaic system according to an embodiment of the present application;
Fig. 20 is a schematic view of another structure of the photovoltaic system according to the embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "first," "second," and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
In the implementation of the present application, "and/or" describes the association relationship of the association object, which means that there may be three relationships, for example, a and/or B, and that there may be three cases where a exists alone, while a and B exist together, and B exists alone.
In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" means two or more. For example, a plurality of cables refers to two or more cables; the plurality of devices means two or more devices.
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 is a schematic structural diagram of a photovoltaic system according to an embodiment of the present application. The photovoltaic system shown in fig. 1 is a solar photovoltaic system. In fig. 1, the photovoltaic system includes a plurality of electric devices including a photovoltaic module 1, an inverter 2, a transformer 3, and a data collector 4.
The photovoltaic module 1 may include a plurality of photovoltaic modules, and the plurality of photovoltaic modules are generally arranged in an array, which is also called a photovoltaic array. A photovoltaic module is a battery module that converts light energy into direct current electric energy to generate electricity when exposed to sunlight. In particular use, the photovoltaic modules are typically grouped to produce the required dc electrical energy. The inverter 2 is used for converting direct-current electric energy generated by the photovoltaic module into alternating-current electric energy. The transformer 3 is used for boosting the alternating current power generated by the inverter 2 and inputting the boosted alternating current power into a power grid for power generation and transmission. The data collector 4 is configured to collect data such as operating parameters and electrical energy output of the photovoltaic module 1 and the inverter 2, and then monitor the operating states of the photovoltaic module 1 and the inverter 2 (e.g., monitor whether the inverter 2 is abnormal, control the inverter 2 to be turned on or off, etc.) based on the collected data. In the present embodiment, the inverter 2 may be a string inverter or a distributed inverter. Referring to fig. 2, when the inverter 2 is a distributed inverter, an MPPT (maximum power point tracking ) combiner box 5 is generally disposed between the photovoltaic module 1 and the inverter 2, and is configured to combine the direct current wires output by the photovoltaic module, perform direct current conversion, output the direct current signals to the inverter 2, and perform a maximum power tracking function.
Fig. 1 is a schematic structural view of a photovoltaic system including a string inverter, fig. 2 is a schematic structural view of a photovoltaic system including a distributed inverter, and fig. 3 is a schematic structural view of a photovoltaic system including a centralized inverter. In the photovoltaic system 100 shown in fig. 1-3, power lines for power transmission are also included. Specifically, a power line 01 for transmitting the direct current power generated by the photovoltaic module 1 to the inverter 2 is provided between the photovoltaic module 1 and the inverter 2 as shown in fig. 1; a power line 03 for transmitting direct current generated by the photovoltaic module to the MPPT combiner box is arranged between the photovoltaic module 1 and the MPPT combiner box 5 as shown in fig. 2, and a power line 04 for transmitting direct current converged by the MPPT combiner box to the inverter 2 is arranged between the MPPT combiner box 5 and the inverter 2; in the photovoltaic system 100 shown in fig. 1 or 2, a power line 02 for transmitting alternating current generated by the inverter 2 to the transformer 3 is provided between the inverter 2 and the transformer 3; a power line 05 is also provided between the data collector 4 and the inverter 2. The power lines 01, 03, 04 may be dc cables. The power lines 02, 05 may be ac cables.
In addition to the power transmission, signal transmission, i.e. data interaction, is usually performed between any two devices. In the long-distance signal transmission between devices, that is, when the distance between two devices is greater than 1KM, signal interaction is generally performed by adopting a PLC (power line communication ) or a carrier communication mode. That is, the distance between any two power devices included in the photovoltaic system is larger, and a PLC transmission mode can be adopted when long-distance signal transmission is required. That is, the signal to be transmitted is modulated and then coupled to the power line for transmission (e.g., when the power line transmits dc power, the modulated signal is coupled to the positive and negative cables for transmission, and when the power line transmits ac power, the modulated signal is coupled to the hot and neutral lines for transmission). Illustratively, when a signal is transmitted between MPPT combiner box 5 and inverter 2, such as when MPPT combiner box 5 sends a signal to inverter 2, the MPPT combiner box modulates the signal and then couples it to power line 04 to transmit the signal to inverter 2. After receiving the modulated signal, the inverter 2 demodulates the modulated signal to obtain data. Illustratively, when the inverter 2 sends a signal to the data collector 4, the inverter 2 modulates the signal and couples the modulated signal to the power line 05 to transmit the signal to the data collector 4, and the data collector 4 demodulates the modulated signal to obtain data.
In the existing PLC signal transmission technology, a capacitive direct coupling mode is commonly adopted in the existing coupling device, and the principle of the existing coupling device is mainly realized in that an inverter modulates a PLC signal and then directly connects the modulated PLC signal to a power line through a capacitor. However, the direct coupling mode of the capacitor has strict requirements on the type selection of the capacitor (for example, the impedance requirement of the PLC signal on the power line needs to be met, the PLC signal cannot be attenuated too much), and the voltage difference between the two power lines connected to the inverter can reach 1500V at maximum, so that the type selection of the capacitor also needs to meet the safety requirement so as to reduce the influence on a modulation circuit in the inverter.
In addition, a magnetic ring coupling mode is adopted in the existing PLC signal transmission technology. As shown in fig. 4, taking PLC signals as an example between the data collector 4 and the inverter 2, a magnetic ring 10 is typically provided on one (positive or negative) of the power lines 05 on the data collector 4 side. The signal input/output of the data collector 4 passes through the magnetic loop so that the signal input/output can couple a signal to the power line 05 through the magnetic loop 10. In general, the data collector 4 transmits a signal to the inverter 2 through the power line 05 and also transmits dc power through the power line 05. Generally, as the current through the magnetic ring 10 increases, the magnetic induction of the magnetic ring 10 increases. When the magnetic induction intensity of the magnetic ring 10 is increased to a certain degree, the magnetic induction intensity is not increased along with the increase of the current. At this time, the magnetic field strength around the magnetic ring 10 continues to increase. Thus, the magnetic permeability of the magnetic ring 10 gradually decreases. The inductance of the magnetic ring 10 is proportional to the magnetic permeability, so that the inductance of the magnetic ring 10 gradually decreases until the magnetic ring 10 reaches magnetic saturation. At this time, the inductance of the magnetic ring 10 tends to be 0. The current transmitted in the photovoltaic system is generally high, which causes the inductance of the magnetic ring 10 to be attenuated sharply, and thus causes the transmitted signal to be attenuated, reducing the reliability of the transmitted signal.
When PLC signal transmission is performed in the high current scenario as shown above, a magnetic ring with higher initial permeability, that is, larger inductance is generally adopted, which results in larger volume of the magnetic ring, higher requirements on materials of the magnetic ring and magnetic ring technology, structural space pressure on design of products, and higher cost of the magnetic ring, thereby increasing the cost of PLC signal transmission and complexity and cost of space structure of the power system.
Based on the above PLC transmission mode, the power line communication device provided by the present application is used for PLC signal transmission between any two power devices of the above photovoltaic system 100. It should be noted that the power line communication device provided by the application is not limited to PLC signal transmission between any two devices of the photovoltaic module 1, the inverter 2, the transformer 3, the data collector 4 and the MPPT combiner box 5 in the photovoltaic system 100, and may also be applied to PLC signal transmission between other devices not shown included in the photovoltaic system 100.
In the power line communication device provided by the application, a differential transmission channel is constructed by utilizing the grounding network and the power cable to transmit PLC signals. Because the grounding grid does not transmit electric energy, the grounding grid is used as a signal transmission channel, no large current is generated, the attenuation of the magnetic permeability of the magnetic ring can be effectively reduced, and the reliability of the transmitted signal is improved. And the volume requirement on the magnetic ring is reduced, and the space and the cost of the photovoltaic system are saved.
The power line communication apparatus according to the present application will be described in detail with reference to the embodiments shown in fig. 5 to 12.
In the example of PLC signal transmission between the MPPT combiner box 5 and the inverter 2 of the embodiment shown in fig. 5 to 12, the power line communication device 100 includes a first modulation circuit 51, a second modulation circuit 21, power lines 041 and 042 for PLC signal transmission, a first magnetic ring L1 provided on the MPPT combiner box 5 side, and a second magnetic ring L2 provided on the inverter 2 side. The first modulation circuit 51 and the second modulation circuit 21 are respectively provided in two power devices performing PLC signal transmission, that is, the first modulation circuit 51 may be provided in the MPPT combiner box 5 and the second modulation circuit 21 may be provided in the inverter 2. The MPPT combiner box 5 may transmit a signal to the inverter 2 or may receive a signal from the inverter 2.
The first modulation circuit 51 and the second modulation circuit 21 each have a function of modulating and demodulating PLC signals. The input/output terminals of the first modulation circuit 51 may include a first input/output terminal P511 and a second input/output terminal P512. The input/output terminals of the second modulation circuit 21 may include a first input/output terminal P211 and a second input/output terminal P212. When the MPPT combiner box 5 sends a signal to the inverter 2, the first modulation circuit 51 modulates an original signal sent from the MPPT combiner box 5 to the inverter 2, then couples the modulated signal to the power line 04 through the first input/output terminal P511 and the second input/output terminal P512, and the second modulation circuit 21 may receive the modulated signal from the power line 04 through the first input/output terminal P211 and the second input/output terminal P212 and then demodulate the received modulated signal, thereby obtaining the original signal.
Similarly, when the inverter 2 sends a signal to the MPPT combiner box 5, the second modulating circuit 21 modulates the original signal sent by the inverter 2 to the MPPT combiner box 5, and then couples the modulated signal to the power line 04 through the first input/output terminal P211 and the second input/output terminal P212, and the first modulating circuit 51 may receive the modulated signal from the power line 04 through the first input/output terminal P511 and the second input/output terminal P512, so as to obtain the original signal.
In one possible implementation, the first power device couples the modulated signal to the power line by way of electromagnetic coupling, and the second power device receives the modulated signal from the power line by way of electromagnetic coupling. Referring specifically to fig. 5, a schematic structural diagram of a power line communication device according to an embodiment of the present application is shown.
For example, in the power line communication device shown in fig. 5, MPPT combiner box 5 transmits direct current power to inverter 2 through power line 04. The power line 04 includes a positive cable 041 and a negative cable 042, the positive cable 041 and the negative cable 042 being used for transmitting direct current power. On the MPPT combiner box 5 side, the positive cable 041 and the negative cable 042 are connected through one filter capacitor C0, and on the inverter 2 side, the positive cable 041 and the negative cable 042 may also be connected through one filter capacitor C0. Typically, a large current flows on both the positive cable 041 and the negative cable 042. And a differential mode noise signal is generated between the positive cable 041 and the negative cable 042, and the capacitor C0 is used for filtering the differential mode noise signal, so that the stability of signal transmission is enhanced.
A signal line 071 led out from the first input/output terminal P511 of the first modulation circuit 51 is connected to the second input/output terminal P512 of the first modulation circuit 51 through the first magnetic loop L1, i.e., the modulation signal of the first modulation circuit 51 is coupled to the first magnetic loop L1. The signal line 072 led out from the first input/output terminal P211 of the second modulation circuit 21 is connected to the second input/output terminal P212 of the second modulation circuit 21 through the second magnetic loop L2, i.e., the modulation signal of the second modulation circuit 21 is coupled to the second magnetic loop L2.
The ground wire 061 penetrating from the casing 52 of the MPPT combiner box 5 is connected to the ground net 6 through the first magnetic ring L1, that is, the first magnetic ring L1 is coupled to the ground net 6. The ground line 062 passing out from the cabinet 22 of the inverter 2 is connected to the ground net 6 through the first magnetic ring L2, i.e., the second magnetic ring L2 is coupled to the ground net 6.
The first magnetic loop L1 and the second magnetic loop L2 may each be coupled to the positive cable 041 via a capacitor. For example, on the side of MPPT combiner box 5, first magnetic loop L1 is coupled to positive cable 041 through capacitor C1. On the inverter 2 side, the second magnetic loop L2 is coupled to the positive cable 041 through a capacitor C2. That is, on the side of MPPT combiner box 5, ground grid 6 is connected to positive cable 041 via capacitor C1, and on the side of inverter 2, ground grid 6 is connected to positive cable 041 via capacitor C2.
In the embodiment shown in fig. 5, a positive cable 041 is used to transmit the modulated signal with the ground network 6. The first modulation circuit 51 is coupled to the ground network 6 through a first magnetic loop L1. Since the modulated signal is a medium-high frequency signal, the frequency is typically in the KHz-MHz frequency range. The capacitors C1 and C2 can transmit medium-high frequency signals as signal transmission channels. When the current output by the first modulation circuit is a forward current, the signal transmission direction thereof is shown by a solid arrow in fig. 5. When the current output from the first modulation circuit 51 is a reverse current, the signal transmission direction thereof is shown by a broken-line arrow in fig. 5. When the current output by the first modulation circuit 51 is forward current, the modulation signal coupled to the first magnetic loop L1 is sequentially transmitted to the grounding network 6 through the first magnetic loop L1, the capacitor C1, the positive cable 041, the capacitor C2 and the second magnetic loop L2, and a signal loop is formed between the positive cable 041 and the grounding network 6. On the side of inverter 2, the modulated signal coupled to positive cable 041 is transmitted to second magnetic loop L2 through capacitor C2, and inverter 2 may receive the modulated signal from positive cable 041 through second magnetic loop L2. When the current output by the first modulation circuit 51 is the reverse current, the modulation signal coupled to the first magnetic loop L1 sequentially passes through the second magnetic loop L2 of the grounding network 6, the capacitor C2, the positive cable 041, the capacitor C1 and the first magnetic loop L1, a signal loop is formed between the positive cable 041 and the grounding network 6, and on the side of the inverter 2, the modulation signal coupled to the grounding network 6 is transmitted to the second magnetic loop L2 through the capacitor C2.
Because the first magnetic ring L1 and the second magnetic ring L2 are both coupled to the grounding grid 6, the grounding grid 6 does not transmit electric energy, so that the inductance of the magnetic rings is not reduced sharply due to overlarge current transmitted on the power line by the first magnetic ring L1 and the second magnetic ring L2, and the stability of the magnetic rings L1 and L2 is improved. By forming a modulation signal loop by utilizing the grounding wire 04 for transmitting electric energy and the grounding network 6 for not transmitting electric energy, the attenuation of signals is reduced, and the reliability of signal transmission is improved.
Similarly, referring to fig. 6, the first magnetic loop L1 and the second magnetic loop L2 may be capacitively coupled to the negative cable 042, respectively. On this side of MPPT combiner box 5, first magnetic loop L1 is coupled to negative cable 042 through capacitor C3, and on this side of inverter 2, second magnetic loop L2 is coupled to negative cable 042 through capacitor C4. That is, on the side of MPPT combiner box 5, ground grid 6 is connected to positive cable 041 via capacitor C1, and on the side of inverter 2, ground grid 6 is connected to positive cable 041 via capacitor C2. A signal loop is formed between the ground net 6 and the negative cable 042. The signal transmission manner can refer to the embodiment shown in fig. 5, and will not be described herein.
Similarly, referring to fig. 7, the first magnetic loop L1 and the second magnetic loop L2 are both coupled to the positive cable 041 and the negative cable 042 through a capacitor, and a signal equalizing circuit is formed between the ground network 6 and the positive cable 041 and between the ground network 6 and the negative cable 042. That is, on this side of MPPT combiner box 5, the first magnetic loop is coupled to positive cable 041 through capacitor C1, the first magnetic loop is coupled to negative cable 042 through capacitor C3, on this side of inverter 2, the second magnetic loop L2 is coupled to positive cable 041 through capacitor C2, and the second magnetic loop L2 is coupled to negative cable 042 through capacitor C4.
Similarly, referring to fig. 8, the first magnetic loop L1 and the second magnetic loop L2 may be respectively coupled to the positive cable 041 and the negative cable 042 through capacitors, and form a signal equalizing circuit among the ground network 6, the positive cable 041 and the negative cable 042. That is, on this side of MPPT combiner box 5, the first magnetic loop is coupled to positive cable 041 through capacitor C1. On this side of the inverter 2, the second magnetic loop is coupled to the negative cable 042 by a capacitor C2. When the MPPT combiner box 5 outputs a modulation signal to the inverter 2, the modulation signal output by the first modulation circuit 51 is coupled to L1. When the current output by the first modulation circuit 51 is a forward current, the modulation signal coupled to the first magnetic loop L1 sequentially passes through the first magnetic loop L1, the capacitor C1, the positive cable 041, the capacitor C0 located at one side of the MPPT combiner box 5, and the negative cable 042, the capacitor C2 and the second magnetic loop L2 are transmitted to the ground network 6. A signal loop is formed between the positive cable 041, the negative cable 042 and the ground network 6. On the side of inverter 2, the modulated signal coupled to positive cable 041 is transmitted to second magnetic loop L2 through negative cable 042 and capacitor C2, and inverter 2 may receive the modulated signal from positive cable 041 through second magnetic loop L2. When the current output by the first modulation circuit 51 is the reverse current, the modulation signal coupled to the first magnetic loop L1 is sequentially transmitted to the ground network 6 through the ground network 6, the second magnetic loop L2, the capacitor C0 located at the inverter 2 side, the negative cable 042, the capacitor C0 located at the MPPT combiner box 5 side, the positive cable 041, the capacitor C1 and the first magnetic loop L1. A signal loop is formed between the negative cable 042, the positive cable 041 and the ground network 6. On the inverter 2 side, the inverter 2 may receive the modulated signal from the ground network 6 through the second magnetic loop L2.
In one possible implementation, the first power device couples the modulated signal to the power line by way of capacitive coupling and the second power device receives the modulated signal from the power line by way of capacitive coupling. Referring specifically to fig. 8, a schematic structural diagram of still another embodiment of a power line communication device according to an embodiment of the present application is shown.
In the power line communication device shown in fig. 9, the MPPT combiner box 5 transmits direct current power to the inverter 2 through the power line 04, the power line 04 including a positive cable 041 and a negative cable 042, the positive cable 041 and the negative cable 042 being used for transmitting direct current power. The first input/output terminal P511 of the first modulation circuit 51 is connected to one end of a capacitor C5, and the other end of the capacitor C5 is connected to the ground network 6. The second input/output terminal P512 of the first modulation circuit 51 is connected to one end of a capacitor C7, and the other end of the capacitor C7 is connected to the positive cable 041. The first input/output terminal P211 of the second modulation circuit 21 is connected to one end of the capacitor C6, and the other end of the capacitor C6 is connected to the ground network 6. The second input/output terminal P212 of the second modulation circuit 21 is connected to one end of a capacitor C8, and the other end of the capacitor C8 is connected to the positive cable 041. Through coupling electric capacity C5 and electric capacity C6 to the earth screen 6 that does not transmit the electric energy, because there is not the production of heavy current on the earth screen 6, reduced the impedance requirement of PLC signal on the power line, reduced the decay of PLC signal, consequently reduced device specification demands such as electric capacity and design degree of difficulty, improved the security performance simultaneously. When the current output by the first modulation circuit 51 is forward current, the first input/output terminal P511 of the first modulation circuit 51 transmits a modulation signal to the ground network 6, the modulation signal is coupled to the ground network 6 through the capacitor C5, the second modulation circuit receives the modulation signal from the ground network 6 through the capacitor C6, demodulates the modulation signal, couples the demodulation signal to the positive cable 041 through the capacitor C8, and transmits the demodulation signal to the first modulation circuit 51 through the capacitor C7. A signal loop is formed between the first modulation circuit 51, the ground network 6, the second modulation circuit 21 and the positive cable 041. When the current output by the first modulation circuit 51 is the reverse current, the second input/output terminal P512 of the first modulation circuit 51 transmits the modulation signal to the positive cable 041 through the capacitor C7, the modulation signal is transmitted to the second modulation circuit 21 through the capacitor C8, the second modulation circuit 21 demodulates the modulation signal, and the second modulation circuit 21 transmits the demodulation signal to the ground network 6 through the capacitor C6 and then to the first modulation circuit 51 through the capacitor C5. A signal loop is formed between the first modulation circuit 51, the positive cable 041, the second modulation circuit 21 and the ground network 6.
Similarly, a signal loop may be formed between the ground net 6 and the negative cable 042. Reference is made to the schematic structural diagram of one embodiment shown in fig. 10. The first input/output terminal P511 of the first modulation circuit 51 is connected to one end of a capacitor C5, and the other end of the capacitor C5 is connected to the ground network 6. The second input/output terminal P512 of the first modulation circuit 51 is connected to one end of the capacitor C7, and the other end of the capacitor C7 is connected to the negative cable 042. The first input/output terminal P211 of the second modulation circuit 21 is connected to one end of the capacitor C6, and the other end of the capacitor C6 is connected to the ground network 6. The second input/output terminal P212 of the second modulation circuit 21 is connected to one end of the capacitor C8, and the other end of the capacitor C8 is connected to the negative cable 042. When the current output from the first modulation circuit 51 is a forward current, a signal loop is formed between the first modulation circuit 51, the ground net 6, the second modulation circuit 21, and the negative cable 042. When the current outputted from the first modulation circuit 51 is a reverse current, a signal loop is formed between the first modulation circuit 51, the negative cable 042, the second modulation circuit 21 and the ground net 6.
Similarly, the first modulation circuit 51 and the second modulation circuit 21 may be coupled to different power lines through capacitors, respectively, as shown in the schematic structure of an embodiment shown in fig. 11. The first input/output terminal P511 of the first modulation circuit 51 is connected to one end of a capacitor C5, and the other end of the capacitor C5 is connected to the ground network 6. The second input/output terminal P512 of the first modulation circuit 51 is connected to one end of a capacitor C7, and the other end of the capacitor C7 is connected to the positive cable 041. The first input/output terminal P211 of the second modulation circuit 21 is connected to one end of the capacitor C6, and the other end of the capacitor C6 is connected to the ground network 6. The second input/output terminal P212 of the second modulation circuit 21 is connected to one end of the capacitor C8, and the other end of the capacitor C8 is connected to the negative cable 042. When the current output by the first modulation circuit 51 is a forward current, a signal loop is formed among the first modulation circuit 51, the ground network 6, the second modulation circuit 21, the negative cable 042, and the positive cable 041. When the current output by the first modulation circuit 51 is the reverse current, a signal loop is formed between the first modulation circuit 51, the positive cable 041, the negative cable 042, the second modulation circuit 21 and the ground network 6.
In one possible implementation, MPPT combiner box 5 couples the modulated signals to power line 04 and ground grid 6 by way of electromagnetic coupling, and inverter 2 receives the modulated signals from power line 04 and ground grid 6 by way of capacitive coupling. At this time, the structure of the power line communication apparatus is as shown in fig. 12. In the power line communication device shown in fig. 12, the specific structure and the working principle of the MPPT combiner box 5 may refer to the related description of the MPPT combiner box 5 shown in fig. 5, and the specific structure and the working principle of the inverter 2 may refer to the related description of the inverter 2 shown in fig. 8, which will not be described herein.
In one possible implementation, MPPT combiner box 5 couples the modulated signals to power line 04 and ground grid 6 by way of capacitive coupling, and inverter 2 receives the modulated signals from power line 04 and ground grid 6 by way of electromagnetic coupling. At this time, the structure of the power line communication apparatus is as shown in fig. 13. In the power line communication apparatus shown in fig. 13, the specific structure and the working principle of the MPPT combiner box 5 side may refer to the related description of the MPPT combiner box 5 side shown in fig. 8, and the specific structure and the working principle of the inverter 2 side may refer to the related description of the inverter 2 side shown in fig. 5, which will not be repeated herein.
In one possible implementation, the modulation circuit is coupled to the power line through a signal coupling device that is capacitively coupled to the ground network. As shown in the schematic structure of one embodiment illustrated in fig. 14, the first input/output terminal P511 of the first modulation circuit 51 in the MPPT combiner box 5 couples the modulated signal to the ground network 6 by way of capacitive coupling, and the second input/output terminal P512 of the first modulation circuit 51 is coupled to the positive cable 041. A signal line led out from the first input/output terminal P211 of the second modulation circuit 21 in the inverter 2 is connected to the second input/output terminal P212 of the second modulation circuit 21 through the magnetic loop L. The positive cable 041 and the negative cable 042 positioned between the MPPT combiner box 5 and the inverter 2 all pass through the magnetic ring L, and the magnetic ring L can increase the impedance of the positive cable 041 and the negative cable 042 and ensure the stability of PLC signal transmission. Also, since the current directions of the positive cable 041 and the negative cable 042 are opposite, the magnetic fluxes generated therefrom can be canceled. Thus, the magnetic ring L is not saturated by the excessive current. The magnetic ring L is coupled to the grounding grid 6 which does not transmit electric energy through the capacitor C2, so that no large current passes through the magnetic ring L, signal attenuation is reduced, and reliability of signal transmission is improved. When the current output by the first modulation circuit 51 is the forward current, the modulated signal transmitted from the first input/output terminal P511 of the first modulation circuit 51 is transmitted to the ground network 6 in a capacitive coupling manner and then transmitted to the magnetic loop L through the capacitor C2, and the second modulation circuit 21 receives the modulated signal coupled to the magnetic loop L, demodulates the modulated signal, and then transmits the demodulated signal to the magnetic loop L through the positive cable 041. When the current output by the first modulation circuit 51 is the reverse current, the modulated signal transmitted from the second input/output terminal P512 of the first modulation circuit 51 is transmitted to the magnetic loop L through the positive cable 041, the second modulation circuit 21 receives the modulated signal coupled to the magnetic loop L, demodulates the modulated signal, and then transmits the demodulated signal to the magnetic loop L, and the demodulated signal can be transmitted to the ground network through the capacitor C2 and then transmitted to the first modulation circuit through the capacitor C1. Similarly, when the power line between the first power device and the second power device is used to transmit alternating current, L-phase cables in the power line may all pass through the magnetic loop to reduce signal attenuation of the magnetic loop.
Similarly, the MPPT combiner box 5 may be electromagnetically coupled, and the inverter 2 may be capacitively coupled, as shown in the schematic structure of an embodiment shown in fig. 15. The first modulation circuit 51 is coupled to the ground network 6 through a magnetic loop L and a capacitor C1, through which both the positive cable 041 and the negative cable 042 pass. The second modulation circuit 21 is coupled to the ground network 6 via a capacitance C2. The second modulation circuit 21 is coupled to the positive cable 041 through a capacitor C3.
Similarly, the MPPT combiner box 5 side and the inverter 2 side adopt electromagnetic coupling, as shown in a schematic structure of an embodiment shown in fig. 16. The first modulation circuit 51 is coupled to the ground network 6 through the magnetic loop L1 and the capacitor C1, and the second modulation circuit 21 is coupled to the ground network 6 through the magnetic loop L2 and the capacitor C2, and the positive cable 041 and the negative cable 042 both pass through the magnetic loop L1 and the magnetic loop L2.
When the above-described power line communication device 100 is located between the data collector 4 and the inverter 2, the inverter 2 transmits alternating-current power to the data collector 4 through the power line 05. Fig. 17 shows a schematic structural diagram of the power line communication device 100 between the data collector 4 and the inverter 2. Since the input/output current of the data collector 4 is small and the input/output current of the inverter 2 is large, the data collector 4 will generally receive the ac power and the PLC signal transmitted from the inverter 2 through the power distribution cabinet 7. The power line 05 includes L-phase cables 051, 052, 053. And filter capacitors are arranged between every two L-phase cables 051, 052 and 053, differential mode noise signals are filtered, and stability of signal transmission is enhanced. In this embodiment, the data collector 4 couples the modulated signal to the power line 05 by means of capacitive coupling, and the inverter 2 receives the modulated signal from the power line by means of electromagnetic coupling. The first modulation circuit 41 is provided in the data collector 4, and the second modulation circuit 21 is provided in the inverter 2. The first input/output terminal P411 of the first modulation circuit 41 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the ground network 6. The second input/output terminal P412 of the first modulation circuit 41 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the cable 051. The signal line led out from the first input/output terminal P211 of the second modulation circuit 21 is connected to the second input/output terminal P212 of the second modulation circuit 21 through the second magnetic loop L2, i.e., the modulation signal of the second modulation circuit 21 is coupled to the second magnetic loop L2, and the second magnetic loop L2 is coupled to the cable 051 through the capacitor C3. When the first modulation circuit 41 outputs forward current, the modulation signal output by the first modulation circuit 41 is transmitted to the L-phase cable 051 through the capacitor C2, and then coupled to the magnetic ring L2 through the capacitor C3, the second modulation circuit receives the modulation signal of the magnetic ring L2, demodulates the modulation signal and transmits the demodulation signal to the magnetic ring L2, and the magnetic ring L2 transmits the demodulation signal to the grounding grid 6. When the first modulation circuit 41 outputs the reverse current, the modulation signal output by the first modulation circuit 41 is transmitted to the grounding network 6 through the capacitor C1 and then coupled to the magnetic ring L2, the second modulation circuit receives the modulation signal of the magnetic ring L2, demodulates the modulation signal and then transmits the demodulated signal to the magnetic ring L2, and the magnetic ring L2 transmits the demodulated signal to the L-phase cable 051 through the capacitor C3 and then transmits the demodulated signal to the first modulation circuit 51 through the capacitor C2.
Based on the same inventive concept, the present application also provides a power device 200, the structure of which is shown in fig. 18, wherein the power device 200 includes a modulation circuit 201, a magnetic ring L, and power lines 041 and 042, the power device 200 receives power transmitted by other power devices 300 through the power lines 041 and 042, the modulation circuit 201 is coupled to the ground network 6 through the magnetic ring, and the modulation circuit 201 receives PLC signals transmitted by other power devices 300 through the power lines 041 and 042 and the ground network 6 through the magnetic ring. The magnetic loop L is coupled to the positive cable 041 through a capacitor C1. When the modulation circuit outputs forward current, the modulation signal output by the modulation circuit is coupled to the magnetic ring L, transmitted to the positive cable 041 through the capacitor C1, then transmitted to other power equipment 300 through the positive cable 041, demodulated by the other power equipment 300, transmitted to the grounding grid, and then transmitted to the magnetic ring L through the grounding grid 6 to form a signal loop. When the modulation circuit outputs reverse current, the modulation signal output by the modulation circuit is coupled to the magnetic ring L, and then transmitted to other power equipment 300 through the grounding network 6, and the other power equipment 300 demodulates the modulation signal and then transmits the positive cable 041 to the magnetic ring L through the capacitor C1.
The power device 200 may be a power device such as the photovoltaic module 1, the inverter 2, the transformer 3, and the data collector 4 in the photovoltaic system 100.
It should be understood that the magnetic loop L and the capacitor described above may also be replaced by an inductor.
Based on the same inventive concept, the embodiment of the application also provides a photovoltaic system, which comprises a plurality of electric devices, wherein the power line communication device is arranged between every two electric devices, and the medium-high frequency signals between every two electric devices are transmitted by using a power line erected between the two electric devices. The schematic structure of the photovoltaic system can be seen with reference to fig. 1-3.
Fig. 19 shows a schematic structural diagram of a power line communication device between one inverter 2 and two MPPT combiner boxes 5. The MPPT combiner box 501 and the MPPT combiner box 502 are connected in parallel, a positive cable 0411 drawn from the MPPT combiner box 501 is connected to a positive cable 0413 drawn from the MPPT combiner box 502, and a negative cable 0412 drawn from the MPPT combiner box 501 is connected to a negative cable 0414 drawn from the MPPT combiner box 502. The second modulation circuit 21 located in the inverter 2 is coupled to the ground grid 61 and the ground grid 62 through the first magnetic loop L1. The first magnetic loop L1 is coupled to the positive cable 0413 through a capacitor C1. The first modulation circuit 5101 located in the MPPT combiner box 501 is coupled to the ground network 61 and the negative cable 0412 through the third magnetic loop L3 and the third capacitor C3, respectively, and the modulated signals output from the first modulation circuit 5101 are coupled to the ground network 61 and the negative cable 0412, respectively. The first modulation circuit 5102 located in the MPPT combiner box 502 is coupled to the ground network 62 and the positive cable 0413 through the third magnetic loop L2 and the modulated signal output by the third capacitor C2, respectively, and the first modulation circuit 5102.
Fig. 20 shows a schematic diagram of a structure of the power line communication device between one data collector 4 and two inverters 2. Inverter 201 and inverter 202 are connected in parallel, and three L-phase cables 0411, 0412, 0413 led out of inverter 201 are connected to three L-phase cables 0416, 0414, 0415 led out of inverter 202, respectively. First modulation circuit 41 located in data collector 4 is coupled to ground network 61 and ground network 62 through capacitor C4. The second modulation circuit 2101 located in the inverter 201 couples the modulated signal output from the second modulation circuit 2101 to the ground network 61 and the L-phase cable 0413 through the third magnetic loop L3 and the capacitor C3, respectively. A first modulation circuit 2102 located in inverter 202 is coupled to ground network 62 and L-phase cable 0414 via a second magnetic loop L2 and capacitor C2, respectively.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322405932.1U CN221614975U (en) | 2023-09-04 | 2023-09-04 | Power line communication device, power equipment and photovoltaic system |
| PCT/CN2024/078727 WO2025050601A1 (en) | 2023-09-04 | 2024-02-27 | Inverter and photovoltaic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322405932.1U CN221614975U (en) | 2023-09-04 | 2023-09-04 | Power line communication device, power equipment and photovoltaic system |
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| CN221614975U true CN221614975U (en) | 2024-08-27 |
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| US9564835B2 (en) * | 2013-03-15 | 2017-02-07 | Sunpower Corporation | Inverter communications using output signal |
| CN111106851B (en) * | 2019-11-28 | 2021-10-15 | 华为技术有限公司 | Power line communication device and power generation system |
| CN211377703U (en) * | 2020-03-11 | 2020-08-28 | 阳光电源股份有限公司 | A power line carrier communication device and photovoltaic inverter system |
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