Inverter

Abstract

The utility model provides an inverter. Comprising an anti-attenuation module, a copper bar and a main node, the master node is connected with the at least one slave node through a copper bar, and the master node transmits power line carrier signals to the at least one slave node through the copper bar; and the anti-attenuation module is arranged on the copper bar to increase the inductive reactance of the copper bar. The anti-attenuation module is used to increase the inductive reactance of the copper bar, inhibit the absorption of the capacitor on the power line carrier signal, and effectively alleviate the influence of the capacitor on the power line carrier communication. The power line carrier signal is ensured to maintain high strength in the transmission process, so that the transmission distance and reliability of the power line carrier signal are improved, and more stable and long-distance communication between each slave node and an inverter in a photovoltaic system is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, and particularly to an inverter. Background Art

[0002] When the current inverter uses Power Line Communication (PLC), due to the existence of capacitors at both ends of the signal coupling point, the PLC signal will be greatly attenuated, thereby reducing the PLC communication distance. Summary of the Utility Model

[0003] In view of this, embodiments of the utility model provide an inverter, aiming to weaken the attenuation of the power line carrier signal by the capacitor and improve the communication distance.

[0004] Embodiments of the utility model provide an inverter, including an anti-attenuation module, a copper bar and a main node;

[0005] The main node is connected to at least one slave node through the copper bar, and the main node transmits a power line carrier signal to at least one of the slave nodes through the copper bar;

[0006] The anti-attenuation module is arranged on the copper bar to increase the inductive reactance of the copper bar.

[0007] In a possible implementation manner, the copper bar includes a busbar and at least one branch copper bar;

[0008] At least one of the slave nodes is respectively connected to the busbar through its corresponding branch copper bar, and the main node is connected to the busbar;

[0009] The main node transmits a power line carrier signal to the corresponding slave node through the busbar and the branch copper bar;

[0010] The anti-attenuation module is arranged on at least one of the branch copper bar and the busbar.

[0011] In a possible implementation manner, the copper bar includes a busbar and at least one branch copper bar;

[0012] At least one of the slave nodes is respectively connected to the busbar through its corresponding branch copper bar;

[0013] The main node transmits a power line carrier signal to the corresponding slave node through the branch copper bar;

[0014] The anti-attenuation module is arranged on at least one of the branch copper bar and the busbar.

[0015] In a possible implementation, the inverter further includes: a gating switch circuit; the main node is connected to the branch busbars corresponding to at least one of the slave nodes through the gating switch circuit.

[0016] In a possible implementation, the busbar includes a positive busbar and a negative busbar;

[0017] The anti-attenuation module is disposed on at least one of the positive busbar and the negative busbar.

[0018] In a possible implementation, the anti-attenuation module includes a housing and a magnetic core, and the magnetic core is embedded in the housing; the anti-attenuation module is sleeved on the busbar.

[0019] In a possible implementation, the cross-sectional area of the busbar is positively correlated with the cross-sectional area of the magnetic core.

[0020] In a possible implementation, the busbar includes a first part and a second part connected in series, and the anti-attenuation module is connected in series between the first part and the second part.

[0021] In a possible implementation, the slave node is located in a junction box.

[0022] In a possible implementation, the junction box is connected to at least one photovoltaic string.

[0023] An embodiment of the present invention provides an inverter. The inverter includes an anti-attenuation module, a busbar, and a main node; the main node is connected to at least one slave node through the busbar, and the main node transmits a power line carrier signal to at least the slave node through the busbar; the anti-attenuation module is disposed on the busbar to increase the inductive reactance of the busbar. By using the anti-attenuation module to increase the inductive reactance of the busbar, the absorption of the power line carrier signal by the capacitor is suppressed, and the influence of the capacitor on power line carrier communication is effectively alleviated. It ensures that the power line carrier signal maintains a high intensity during transmission, thereby improving the transmission distance and reliability of the power line carrier signal, and enabling more stable and long-distance communication between each slave node and the inverter in the photovoltaic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.

[0025] Figure 1 A schematic diagram of an inverter provided by an embodiment of the present invention;

[0026] Figure 2 Schematic diagram of another inverter provided by an embodiment of the present utility model;

[0027] Figure 3 Structural schematic diagram of another inverter provided by an embodiment of the present utility model;

[0028] Figure 4 Structural schematic diagram of yet another inverter provided by an embodiment of the present utility model;

[0029] Figure 5 Schematic diagram of an inverter provided by an embodiment of the present utility model;

[0030] Figure 6 Schematic diagram of another inverter provided by an embodiment of the present utility model;

[0031] Figure 7 Structural schematic diagram of another inverter provided by an embodiment of the present utility model;

[0032] Figure 8 Structural schematic diagram of yet another inverter provided by an embodiment of the present utility model. Specific implementation manner

[0033] To solve the problem of limited communication distance mentioned in the above background art, as an exemplary technical solution, the power line carrier communication distance can be increased by increasing the transmission power of the power line carrier signal. However, this solution not only increases the overall power consumption of the photovoltaic system; moreover, due to the increased transmission power, many devices are under higher stress, increasing costs. In addition, the capacities of the DC side capacitor banks of different inverters are different, and the attenuations are different. To maintain the same communication distance, different transmission powers need to be designed for different capacitor banks, and the versatility of this solution is poor.

[0034] To address the problems in the background art, an embodiment of the present utility model provides an inverter, including an anti-attenuation module, a copper bar, and a main node; the main node is connected to at least one slave node through the copper bar, and the main node transmits power line carrier signals to at least the slave node through the copper bar; the anti-attenuation module is arranged on the copper bar to increase the inductive reactance of the copper bar. By using the anti-attenuation module to increase the inductive reactance of the copper bar, the absorption degree of the capacitor for the power line carrier signal is reduced, effectively alleviating the influence of the capacitor on power line communication. Ensure that the power line carrier signal maintains a high intensity during transmission, thereby increasing the transmission distance and reliability of power line communication, enabling more stable and long-distance communication between each slave node and the inverter in the photovoltaic system. And, this inverter does not need to change the transmission frequency of the power line carrier signal.

[0035] Obviously, the embodiments described in the present utility model are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0036] See Figure 1 , Figure 1 which is a schematic diagram of an inverter provided by an embodiment of the present utility model. The photovoltaic system includes an anti-attenuation module, a copper busbar, and a main node.

[0037] The main node is connected to at least one slave node through the copper busbar, and the main node transmits a power line carrier signal to at least one of the slave nodes through the copper busbar; the anti-attenuation module is arranged on the copper busbar to increase the inductive reactance of the copper busbar, and power line communication is carried out between the main node and the slave node through the copper busbar. At least one slave node such as Figure 1 the first slave node, the second slave node, and the Nth slave node shown, where N is an integer greater than or equal to 1. The number of slave nodes connected to the main node through the copper busbar can be one or more, which is not limited in the embodiments of the present utility model. Figure 1 In the example, multiple slave nodes are taken as an example.

[0038] Power Line Communication (PLC) is a communication technology that uses power lines to transmit data signals. In a photovoltaic system, power line communication technology can be used for communication between the main node and the slave node. The power line communication technology can directly use the power lines for communication, eliminating the cost of laying additional communication lines and improving the overall reliability and stability of the photovoltaic system. The main node and the slave node can achieve data transmission and monitoring by transmitting power line carrier signals, which is convenient for monitoring the system operation status and realizing remote control.

[0039] In a possible implementation manner, the main node is located in the inverter, and the slave node is located in the junction box.

[0040] An inverter is a device in a photovoltaic system that converts direct current (DC) into alternating current (AC). In a photovoltaic system, the current generated by the photovoltaic string is direct current, but most household and industrial devices use alternating current, and alternating current can be effectively transmitted in the power grid. Therefore, it is necessary to convert the direct current generated by the photovoltaic string into alternating current that meets the requirements of the power grid through an inverter.

[0041] A combiner box is a device used in a photovoltaic system to centrally collect and distribute the DC current output from multiple photovoltaic strings. In the embodiments of the present utility model, the combiner box can be connected to at least one photovoltaic string. In large-scale or decentralized photovoltaic power generation systems, the DC power output of individual photovoltaic panels or small groups of serially connected photovoltaic strings will first be collected in the combiner box. The combiner box is mainly used to collect the DC power generated by the photovoltaic strings together and transmit it to the inverter for conversion; and it is used to provide overload and open circuit protection, and monitor the working status of the photovoltaic strings to detect faults and problems in a timely manner.

[0042] A copper busbar is a conductive material used to transmit electricity, usually made of high-purity copper. In the power system, copper busbars are widely used to connect electrical equipment, transmit power signals and current. Copper busbars have good electrical conductivity and mechanical strength, and can withstand the requirements of high current and long-term operation.

[0043] The copper busbar is used to connect the main nodes in multiple combiner boxes and inverters. In a photovoltaic system, a capacitor is connected in series between the positive and negative poles of the copper busbar. The capacitor can smooth the voltage. By the response ability of the capacitor to voltage spikes and drops, it helps to smooth the voltage fluctuations caused by load changes or power supply instability. And, the capacitor can provide a lower impedance path for high-frequency signals, thereby reducing electrical noise and improving the electrical performance of the entire system.

[0044] However, the capacitor will also affect the strength of the power line carrier signal. Power line communication technology realizes communication by transmitting power line carrier signals on the power line (i.e., the copper busbar). These power line carrier signals usually exist in the form of carriers, and the frequency of the power line carrier signals is much higher than the fundamental frequency of the power line. When transmitting power line carrier signals, the capacitor has an obvious absorption effect on the transmission characteristics of the power line carrier signals, which will cause the power line carrier signals to attenuate.

[0045] In a possible implementation, the copper busbar includes a positive copper busbar and a negative copper busbar. An anti-attenuation module is provided on at least one of the positive copper busbar and the negative copper busbar. The capacitor is connected in series between the positive copper busbar and the negative copper busbar.

[0046] The anti-attenuation module is used to increase the inductance in the copper busbar, thereby increasing the inductive reactance of the copper busbar and suppressing the absorption of the power line carrier signals by the capacitor in the copper busbar. As an implementation, the copper busbar includes a first part and a second part connected in series, and the anti-attenuation module can be connected in series between the first part and the second part.

[0047] The main node in the inverter is used to send power line carrier signals to at least one slave node through the copper busbar, and is used to receive the signals fed back by at least one slave node according to the power line carrier signals through the copper busbar.

[0048] The master node injects power line carrier signals onto the copper busbar. These power line carrier signals are transmitted through the copper busbar to each slave node to achieve power line communication between the master node and the slave nodes. The master node can select specific slave nodes for communication as needed. After receiving the power line carrier signals sent by the master node, the slave nodes can demodulate the power line carrier signals into specific control instructions through a demodulator. The slave nodes execute the corresponding operations and convert the execution results into feedback signals, which are transmitted back to the master node through the copper busbar. After receiving the feedback signals from the slave nodes, the master node can monitor and adjust based on this information to ensure the stability and efficiency of the system operation.

[0049] In a possible implementation, the slave node is used to obtain the direct current transmitted by the photovoltaic string and converge the direct current to the inverter through the copper busbar; the inverter is used to convert the received direct current into alternating current.

[0050] As a power collection and distribution device on the DC side, the slave node receives the direct current generated by the photovoltaic string and converges the direct current to the inverter through the copper busbar. The slave node is responsible for summarizing and distributing the received direct current to ensure the stability and safety of power transmission. As a key device on the AC side, the inverter receives the direct current transmitted from at least two slave nodes and converts it into alternating current for output to the power grid. The inverter converts the DC energy into alternating current that meets the grid standards through inverse transformation technology, realizing the efficient utilization of the energy of the photovoltaic system.

[0051] In this implementation, the cooperation between the busbar box as the slave node and the inverter enables the photovoltaic system to effectively convert solar energy into available electric energy and deliver clean energy to the power grid. At the same time, the inverter improves the applicability of the system through its conversion function and can adapt to different grid environments and requirements. Through the combined action of the busbar box and the inverter, the photovoltaic system can achieve reliable and efficient power generation operation.

[0052] In the embodiment of the present utility model, the anti-attenuation module includes a housing and a magnetic core, and the magnetic core is embedded in the housing; the anti-attenuation module is sleeved on the copper busbar.

[0053] The housing is the external structure of the anti-attenuation module, usually made of insulating material or metal material, and is used to protect the internal circuit and components. The housing can effectively isolate the influence of the external environment on the internal circuit, improve the anti-interference ability, and ensure the stability and reliability of the power line carrier signal transmission.

[0054] The magnetic core is the core component of the anti-attenuation module, usually made of amorphous material, with high anti-saturation ability, which can effectively enhance the transmission performance of the power line carrier signal and suppress signal attenuation and interference.

[0055] The magnetic core is internally embedded in the housing, forming a compact structure, while providing good electromagnetic shielding effect, reducing the impact of external electromagnetic interference on the internal circuit. By adopting the design of the housing and the magnetic core, the anti-attenuation module can effectively improve the transmission quality and stability of the power line carrier signal, and play an important role in the smart grid and photovoltaic systems.

[0056] The cross-sectional area of the copper busbar is positively correlated with the cross-sectional area of the magnetic core. The larger the cross-sectional area of the copper busbar, the larger the cross-sectional area of the magnetic core.

[0057] Through the above design, the inductive reactance of the copper busbar can be increased, thereby reducing the attenuation of the signal and improving the stability and reliability of signal transmission. By adjusting the cross-sectional areas of the copper busbar and the magnetic core to match, the performance of the anti-attenuation module can be better optimized to ensure its effective application in the inverter system.

[0058] In the embodiment of the present utility model, by setting the anti-attenuation module on the copper busbar, the total inductive reactance of the copper busbar is increased. The increased inductive reactance provides a greater hindrance to the AC signal (especially high-frequency signals such as power line carrier signals), which is beneficial to reducing the signal loss caused by capacitance. Since the impedance of the anti-attenuation module to the power line carrier signal is greater than that of the capacitance, the power line carrier signal is more inclined to transmit through the path with a larger inductive reactance, that is, through the anti-attenuation module, thereby bypassing the capacitance, reducing the absorption and attenuation of the signal by the capacitance, and further increasing the transmission distance of the power line carrier signal.

[0059] In the embodiment of the present utility model, the copper busbar may include a busbar copper busbar and at least one branch copper busbar. The at least one branch copper busbar is respectively connected to the busbar copper busbar, and the branch copper busbar is connected to the slave nodes one by one.

[0060] The busbar copper busbar is used for collecting the current of at least one branch copper busbar. The busbar copper busbar plays a role in collecting current in the inverter, while the branch copper busbar is used to connect to different slave nodes. Each slave node is directly connected to the busbar copper busbar through the corresponding branch copper busbar, and then the direct current of each combiner box is concentrated on the busbar copper busbar through the branch copper busbar. The inverter converts the direct current in the busbar copper busbar into alternating current. And, the main node in the inverter can send power line carrier signals to each combiner box through the busbar copper busbar and the branch copper busbar to obtain the voltage, current, power and temperature data of each slave node. It should be noted that in this embodiment, the anti-attenuation module can be set on the busbar copper busbar, or can be set in each branch copper busbar, or can be set on the busbar copper busbar and each branch copper busbar at the same time.

[0061] In a possible implementation manner, the slave nodes are respectively connected to the busbar copper busbar through their respective corresponding branch copper busbars, and the main node is connected to the busbar copper busbar;

[0062] The main node transmits power line carrier signals to the corresponding slave nodes through the busbar and branch busbars;

[0063] The anti-attenuation module is provided on at least one of the branch busbar and the busbar.

[0064] As Figure 2 shown, Figure 2 FIG. is a schematic diagram of another inverter provided by an embodiment of the present invention. The anti-attenuation module can be separately provided on the busbar. As Figure 3 shown, Figure 3 FIG. is a schematic diagram of yet another inverter provided by an embodiment of the present invention. The anti-attenuation module can be provided on each branch busbar. Of course, it can also be as Figure 4 shown, and the anti-attenuation module is provided on both the busbar and each branch busbar at the same time.

[0065] In the above Figures 2 - 4 provided inverter, the anti-attenuation module can improve the inductive reactance of the busbar and suppress the effect of the capacitor absorbing the power line carrier signal.

[0066] Figure 2 In the inverter shown, by directly providing the anti-attenuation module in the busbar, the design of the photovoltaic system can be simplified, the number of components and connection points can be reduced, and the complexity of the photovoltaic system can be lowered. Moreover, providing the anti-attenuation module in the busbar can save space and reduce the area occupied by equipment installation. Furthermore, it can more comprehensively suppress the influence of the capacitor bank on the power line carrier signal and improve the anti-interference ability of the photovoltaic system.

[0067] Figure 3 In the inverter shown, providing the anti-attenuation module in each branch busbar can provide local anti-interference protection in different regions or directions and reduce the interference received by the power line carrier signal. Additionally, by setting it according to the specific conditions of different branches, the anti-attenuation module can be flexibly adjusted according to specific requirements and actual situations to better meet the requirements of the photovoltaic system. Adopting a distributed anti-attenuation module can also improve the stability and reliability of the photovoltaic system and avoid the impact of a single-point failure on the overall photovoltaic system.

[0068] Figure 4 In the inverter shown, by simultaneously providing multiple anti-attenuation modules at different positions, comprehensive anti-interference protection can be provided within the entire photovoltaic system to ensure the stable and reliable transmission of the power line carrier signal. Providing the anti-attenuation module on the busbar and branch busbars can build a dual protection mechanism, increase the stability and anti-interference ability of the photovoltaic system, better ensure the quality of the power line carrier signal transmission, and improve the reliability and stability of communication.

[0069] In another possible implementation, the slave nodes are respectively connected to the busbar through their corresponding branch busbars, and the master node transmits power line carrier signals to the corresponding slave nodes through the branch busbars; an anti-attenuation module is provided on at least one of the branch busbars and the busbar.

[0070] As Figure 5 shown, Figure 5 FIG. is a schematic diagram of an inverter provided by an embodiment of the present invention, and the anti-attenuation module can be separately provided on the busbar. As Figure 6 shown, Figure 6 FIG. is a schematic structural diagram of another inverter provided by an embodiment of the present invention. The anti-attenuation module can be provided on each branch busbar. Of course, it can also be as Figure 7 shown, and the anti-attenuation module is provided on both the busbar and each branch busbar at the same time.

[0071] In the above Figures 5 - 7 provided inverter, the anti-attenuation module can improve the inductance of the busbar and suppress the effect of the capacitor absorbing the power line carrier signal.

[0072] On the basis of the inverter shown in Figures 5 - 7 connected to each branch busbar, in order to realize the separate control of each busbar box, the inverter may further include a gating switch circuit. As Figure 8 shown, the master node is connected to the branch busbars corresponding to each slave node through the gating switch circuit.

[0073] Through the control of the gating switch circuit, the master node can selectively input the power line carrier signal onto a specific branch busbar. As an example, if the master node needs to separately control the first slave node, the master node will inject the power line carrier signal onto the branch busbar connected to the first slave node through the gating switch circuit, without affecting other branch busbars. The master node can send control instructions for a specific slave node to achieve the separate control of that slave node, while other slave nodes are not affected.

[0074] In one possible implementation, the busbar includes a positive busbar and a negative busbar, and the anti-attenuation module is provided on at least one of the positive busbar and the negative busbar.

[0075] The busbar includes a positive busbar and a negative busbar, and the anti-attenuation module can be provided on any one of the polarities, that is, on the positive busbar or the negative busbar, or can be provided on both polarities at the same time.

[0076] When the anti-attenuation module is disposed on the positive busbar or the negative busbar, an optimized electromagnetic coupling effect and signal transmission stability can be achieved on the corresponding polarity. By disposing the anti-attenuation module on a single polarity, the quality and stability of the power line carrier signal transmission can be improved for that polarity, and the signal attenuation can be reduced. If the anti-attenuation module is disposed on both the positive busbar and the negative busbar, the inductive reactance of the entire busbar can be comprehensively improved. By uniformly distributing the anti-attenuation modules on the two polarities, a more balanced power line carrier signal transmission can be achieved in the entire circuit.

[0077] In another possible implementation, the branch busbar includes a positive branch busbar and a negative branch busbar, and the anti-attenuation module is disposed on the positive branch busbar or the negative branch busbar of the branch busbar.

[0078] The branch busbar includes a positive branch busbar and a negative branch busbar. Taking the example that multiple branch busbars include a first branch busbar and a second branch busbar, the anti-attenuation module can be disposed on the positive branch busbar or the negative branch busbar of the first branch busbar, and simultaneously disposed on the positive branch busbar or the negative branch busbar of the second branch busbar. By simultaneously disposing the anti-attenuation module on the first branch and the second branch busbar, the signal transmission quality and stability of the entire branch system can be ensured. By uniformly distributing the anti-attenuation modules on the two branches, the power load signal transmission effect of the branch busbar can be evenly improved, ensuring that the busbar box of the branch can accurately receive the power load signal and improving the stability of the photovoltaic system.

[0079] In one possible implementation, the busbar includes a positive busbar and a negative busbar, and the branch busbar includes a positive branch busbar and a negative branch busbar. Taking the example that multiple branch busbars include a first branch busbar and a second branch busbar, the first slave node is connected to the positive busbar through the positive branch busbar of the first branch busbar, and is connected to the negative busbar through the negative branch busbar of the first branch busbar; the second slave node is connected to the positive busbar through the positive branch busbar of the second branch busbar, and is connected to the negative busbar through the negative branch busbar of the second branch busbar.

[0080] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments. The above description is only an exemplary implementation manner of the present invention and is not used to limit the protection scope of the present invention.

Claims

1. An inverter, characterized in that, It includes an anti-attenuation module, a busbar, and a main node; The main node is connected to at least one slave node through the busbar, and the main node transmits a power line carrier signal to at least one of the slave nodes through the busbar; The anti-attenuation module is arranged on the busbar to increase the inductive reactance of the busbar.

2. The inverter according to claim 1, wherein The busbar includes a busbar for current collection and at least one branch busbar; At least one of the slave nodes is respectively connected to the busbar for current collection through its corresponding branch busbar, and the main node is connected to the busbar for current collection; The main node transmits a power line carrier signal to the corresponding slave node through the busbar for current collection and the branch busbar; The anti-attenuation module is arranged on at least one of the branch busbar and the busbar for current collection.

3. The inverter according to claim 1, characterized in that, The busbar includes a busbar for current collection and at least one branch busbar; At least one of the slave nodes is respectively connected to the busbar for current collection through its corresponding branch busbar; The main node transmits a power line carrier signal to the corresponding slave node through the branch busbar; The anti-attenuation module is arranged on at least one of the branch busbar and the busbar for current collection.

4. The inverter according to claim 2 or 3, characterized in that, It further includes: A gating switch circuit; The main node is connected to the branch busbar corresponding to at least one of the slave nodes through the gating switch circuit.

5. The inverter according to any one of claims 1 to 3, characterized in that, The busbar includes a positive busbar and a negative busbar; The anti-attenuation module is arranged on at least one of the positive busbar and the negative busbar.

6. The inverter according to any one of claims 1 to 3, characterized in that, The anti-attenuation module includes a housing and a magnetic core, the magnetic core is embedded in the housing; the anti-attenuation module is sleeved on the busbar.

7. The inverter according to claim 6, wherein The cross-sectional area of the busbar is positively correlated with the cross-sectional area of the magnetic core.

8. The inverter according to any one of claims 1-3, characterized in that, The busbar includes a first part and a second part connected in series, and the anti-attenuation module is connected in series between the first part and the second part.

9. The inverter according to any one of claims 1 to 3, characterized in that, The slave node is located in a busbar box.

10. The inverter according to claim 9, characterized in that, The busbar box is connected to at least one photovoltaic string.

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