Plc communication device and power electronics

Abstract

The disclosure discloses a PLC communication device and a power electronic equipment, and relates to the technical field of power electronics. The PLC communication device, the channel port of the PLC circuit is connected with the signal coupling circuit through the corresponding filter array and the channel transmission branch, the signal coupling circuit is also used for connecting the external power cable of the PLC communication device, and then the transmission of the communication signal between the PLC circuit and the external power cable is realized. Each filter array is used for transmitting the communication signal of a target frequency band, and the target frequency band refers to any one of at least two frequency bands that can be transmitted by the filter array, that is, each filter array can change the frequency band of the signal transmitted by itself, so that different channel transmission branches can transmit communication signals of the same frequency band or communication signals of different frequency bands, thereby improving the flexibility of data transmission.

Description

Technical Field

[0001] This disclosure relates to the field of power electronics technology, and in particular to a PLC communication device and a power electronic device. Background Technology

[0002] In power conversion systems, PLC (Power Line Carrier) communication technology is commonly used for data transmission. However, in currently used PLC communication systems, the data transmission method is limited and lacks flexibility. Utility Model Content

[0003] In view of the above problems, this disclosure provides a PLC communication device and power electronic equipment to improve the flexibility of data transmission. The specific solution is as follows:

[0004] The first aspect of this disclosure provides a PLC communication device, comprising: a PLC circuit, a signal coupling circuit, at least two channel transmission branches, and at least two filter arrays; wherein...

[0005] The channel ports of the PLC circuit are connected to the signal coupling circuit in sequence through the corresponding filter array and the channel transmission branch;

[0006] The signal coupling circuit is also used to connect the external power cable of the PLC communication device;

[0007] Each of the filter arrays is configured to transmit communication signals in a target frequency band, which is any one of at least two frequency bands that the filter array can transmit.

[0008] In one possible implementation, at least two of the filter arrays simultaneously transmit communication signals in different target frequency bands.

[0009] In one possible implementation, there are at least two filter arrays that transmit communication signals of the same target frequency band simultaneously and in the same direction through different phases of the external power cable.

[0010] In one possible implementation, the number of PLC circuits is greater than 1, and the number of communication channels in each PLC circuit is greater than or equal to 1; the communication channels receive and output communication signals through the channel ports of the PLC circuits.

[0011] In one possible implementation, the number of PLC circuits is 1, the number of communication channels in the PLC circuits is greater than 1, and each of the communication channels receives and outputs communication signals through the corresponding channel port of the PLC circuit.

[0012] In one possible implementation, each of the filter arrays is controlled by either the PLC circuit to which it is connected or the processor to which the PLC circuit is connected.

[0013] In one possible implementation, the channel port of the PLC circuit includes: the channel input terminal and the channel output terminal of the corresponding communication channel in the PLC circuit;

[0014] The channel transmission branch includes: a receiving branch and a transmitting branch;

[0015] The filter array includes: a receiving filter subarray and a transmitting filter subarray;

[0016] The input terminal of the receiving branch is connected to the signal coupling circuit, and the output terminal of the receiving branch is connected to the channel input terminal of the corresponding communication channel through the corresponding receiving filter subarray; the receiving branch is used to receive the communication signal on the signal coupling circuit, and transmit the communication signal that the corresponding communication channel can receive to the channel input terminal of the corresponding communication channel through the corresponding receiving filter subarray;

[0017] The input terminal of the transmitting branch is connected to the channel output terminal of the corresponding communication channel through the corresponding transmitting filter subarray, and the output terminal of the transmitting branch is connected to the signal coupling circuit; the transmitting branch is used to receive the communication signal output by the channel output terminal of the corresponding communication channel through the corresponding transmitting filter subarray, and transmit the received communication signal to the signal coupling circuit.

[0018] In one possible implementation, the transmitting branch includes: an amplifier circuit;

[0019] The input terminal of the amplifier circuit is connected to the corresponding channel output terminal through the corresponding transmitting filter subarray;

[0020] The output terminal of the amplifier circuit is connected to the signal coupling circuit.

[0021] The amplifier circuit is used to amplify and transmit the received communication signals.

[0022] In one possible implementation, the receiving branch includes: a filtered receiving circuit;

[0023] The input terminal of the filter receiving circuit is connected to the signal coupling circuit;

[0024] The output terminal of the filter receiving circuit is connected to the corresponding channel input terminal through the corresponding receiving filter sub-array;

[0025] The filtering receiving circuit is used to filter out noise outside the preset frequency band of the received communication signal, and to transmit the communication signal in the preset frequency band; the preset frequency band is within the frequency band corresponding to the corresponding communication channel.

[0026] In one possible implementation, the number of filter receiving circuits in the receiving branch is greater than 1, the filter receiving circuits are connected in parallel, and the preset frequency bands corresponding to the filter receiving circuits are different.

[0027] In one possible implementation, both the receiving filter subarray and the transmitting filter subarray include at least two parallel-connected controllable filter branches, each controllable filter branch including a series-connected filter branch and a controllable switch.

[0028] In one possible implementation, the number of signal coupling circuits is 1, and each of the channel transmission branches is connected to the external power cable through the signal coupling circuit;

[0029] Alternatively, the number of signal coupling circuits is greater than 1, and each of the channel transmission branches is connected to the external power cable through the corresponding signal coupling circuit.

[0030] A second aspect of this disclosure provides a power electronic device including a PLC communication device as described in the first aspect or any implementation thereof.

[0031] By means of the above technical solution, the PLC communication device provided in this disclosure has a PLC circuit channel port connected to a signal coupling circuit through a corresponding filter array and channel transmission branch. The signal coupling circuit is also used to connect the external power cable of the PLC communication device, thereby enabling the transmission of communication signals between the PLC circuit and the external power cable. Furthermore, each filter array is configured to transmit communication signals in a target frequency band. The target frequency band refers to any one of at least two frequency bands that the filter array can transmit. That is, each filter array can change the frequency band of its transmitted signal, allowing different transmission channels to transmit communication signals in the same or different frequency bands, thereby improving the flexibility of data transmission. Moreover, when different transmission channels transmit communication signals in different frequency bands, there is no mutual interference between these channels, allowing for simultaneous signal transmission in different directions. This enables bidirectional signal transmission between the PLC circuit and external power cables, achieving full-duplex communication. Additionally, the absence of mutual interference between different transmission channels also allows for the simultaneous transmission of different types of data, enabling parallel task execution and increasing transmission speed. Attached Figure Description

[0032] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0033] Figure 1 A schematic diagram of the structure of a PLC communication device provided in an embodiment of this disclosure;

[0034] Figure 2 This is another schematic diagram of the structure of the PLC communication device provided in the embodiments of this disclosure;

[0035] Figure 3 This is a schematic diagram illustrating a signal transmission method when two PLC communication devices provided in this embodiment of the present disclosure are respectively used as master and slave nodes in PLC communication;

[0036] Figure 4 This is a schematic diagram illustrating another signal transmission method when the two PLC communication devices provided in this embodiment of the present disclosure are respectively used as master and slave nodes in PLC communication;

[0037] Figure 5 This is a schematic diagram illustrating another signal transmission method when the two PLC communication devices provided in this embodiment of the present disclosure are respectively used as master and slave nodes in PLC communication;

[0038] Figure 6 This is a schematic diagram illustrating another signal transmission method when the two PLC communication devices provided in this embodiment of the present disclosure are respectively used as master and slave nodes in PLC communication;

[0039] Figure 7 This is a schematic diagram illustrating another signal transmission method when the two PLC communication devices provided in this embodiment of the present disclosure are respectively used as master and slave nodes in PLC communication;

[0040] Figure 8 This is a schematic diagram illustrating another signal transmission method when the two PLC communication devices provided in this embodiment of the present disclosure are respectively used as master and slave nodes in PLC communication;

[0041] Figure 9 This is a schematic diagram of the power converter provided in an embodiment of the present disclosure;

[0042] Figure 10 This is a schematic diagram of the structure of a power conversion system provided in an embodiment of the present disclosure;

[0043] Figure 11 This is a schematic diagram of another power conversion system provided in an embodiment of the present disclosure. Detailed Implementation

[0044] The embodiments of this disclosure are described below with reference to the accompanying drawings. The terminology used in the Description of Embodiments section of this disclosure is for illustrative purposes only and is not intended to limit the scope of this disclosure.

[0045] The embodiments of this disclosure are described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure. It will be understood by those skilled in the art that, with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of this disclosure are also applicable to similar technical problems.

[0046] The terms “first,” “second,” etc., used in this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the description of embodiments of this disclosure. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of units is not necessarily limited to those units, but may include other units not expressly listed or inherent to those processes, methods, products, or apparatuses.

[0047] This disclosure provides a PLC communication device to improve the flexibility of data transmission. The specific solution is as follows:

[0048] like Figure 1 As shown, the PLC communication device 100 includes: a PLC circuit 10, a signal coupling circuit 30, at least two channel transmission branches 20, and at least two filter arrays 40; wherein:

[0049] The channel ports of the PLC circuit 10 are connected to the signal coupling circuit 30 in sequence through the corresponding filter array 40 and the channel transmission branch 20. The signal coupling circuit 30 is also used to connect the external power cable 11 of the PLC communication device 100. This connection can be a direct connection or a coupled connection, depending on the structure of the signal coupling circuit 30, and is not limited here.

[0050] In practical applications, the external power cable 11 can refer to the power cable that connects the device containing the PLC communication device 100 to other devices. This connection via the external power cable 11 enables power transmission between the corresponding devices. The PLC circuit 10 is also connected to the processor 200 of the device containing the PLC communication device 100. Through the PLC communication device 100, data output from the processor 200 can be transmitted to the external power cable 11, or data can be transmitted from the external power cable 11 to the processor 200. This allows for carrier communication via existing power cables, eliminating the need for additional wiring and significantly reducing communication deployment costs.

[0051] Furthermore, each filter array 40 is configured to transmit communication signals in a target frequency band, which is any one of at least two frequency bands that the filter array 40 can transmit. That is, each filter array 40 can transmit communication signals in at least two frequency bands. During the application of this PLC communication device 100, one of the frequency bands that each filter array 40 can transmit can be set as the corresponding target frequency band according to actual needs. For example, the PLC circuit 10 connected to each filter array 40 can control the target frequency band of its corresponding filter array 40, or the processor 200 can control the target frequency band of each filter array 40, depending on the specific application environment; all of these are within the scope of this disclosure.

[0052] Since each filter array 40 can change its own transmitted signal frequency band, and in practical applications, the target frequency bands of each filter array 40 can be the same or different, different channel transmission branches 20 can transmit communication signals of the same frequency band or communication signals of different frequency bands, thereby improving the flexibility of data transmission.

[0053] The specific working principle is as follows:

[0054] The processor 200 outputs data to the PLC circuit 10. Any PLC circuit 10 can modulate the data output by the processor 200, and the modulated communication signal is filtered for the target frequency band through the corresponding filter array 40. The resulting communication signal for the target frequency band is then transmitted to the signal coupling circuit 30 through the corresponding channel transmission branch 20. The communication signal is then coupled to the external power cable 11 through the coupling effect of the signal coupling circuit 30, thereby realizing the external transmission of data.

[0055] When the processor 200 acquires data from the external power cable 11, the communication signal on the external power cable 11 can be transmitted in reverse through the signal coupling circuit 30 to each channel transmission branch 20. Then, each channel transmission branch 20 transmits the communication signal of the corresponding frequency band to the filter array 40 connected to it. The communication signal of the target frequency band obtained by the filter array 40 is transmitted to the corresponding PLC circuit 10. The PLC circuit 10 then demodulates the received communication signal to obtain the corresponding data and transmits it to the processor 200.

[0056] Taking ground-mounted power plant applications as an example, PLC communication solutions have become the mainstream communication networking scheme. However, since carrier signals are frequency domain signals, only one set of information can be transmitted within the same frequency band at any given time. Traditional half-duplex communication requires time-division multiplexing of the same frequency band for the execution of each task, resulting in slow data transmission speeds. Specifically, in common scenarios, such as AC-side PLCs in string inverters or DC-side PLCs in centralized inverters, half-duplex communication is used, meaning that only one-way communication signals can be transmitted at any given time, and full-duplex communication is not supported. Furthermore, the current transmission rate of PLC communication is approximately 115kbps, which is relatively slow. Facing current demands for fault recording and experience upgrades, the amount of data that needs to be transmitted is increasing, but the data throughput of current communication methods is limited, leading to excessively long times for log export, upgrades, and fault recording, which cannot meet the requirements.

[0057] In this embodiment, each filter array 40 is configured to change its own transmitted signal frequency band. This not only improves the flexibility of data transmission, but also ensures that when different channel transmission branches 20 transmit communication signals of different frequency bands, each frequency band is independent and does not interfere with the others. This eliminates mutual interference in signal transmission between these channel transmission branches 20, allowing for signal transmission in different directions simultaneously. In other words, the PLC circuit 10 can transmit signals bidirectionally with the external power cable 11, thus achieving full-duplex communication. Furthermore, the absence of mutual interference in signal transmission between different channel transmission branches 20 also allows for the simultaneous transmission of different types of data, enabling parallel task execution and improving transmission speed. The number of channel transmission branches 20 is not limited and can be set according to the needs of the actual application scenario. This allows the PLC communication device 100 to support the simultaneous transmission of multiple task data types, such as parallel tasks like fast scheduling, log export, upgrades, and polling, reducing task collisions and optimizing transmission time.

[0058] In practical applications, the PLC communication device 100 can be configured to: have at least two filter arrays 40 simultaneously transmitting communication signals of different target frequency bands; and / or have at least two filter arrays 40 transmitting communication signals of the same target frequency band simultaneously and in the same direction through different phases of the external power cable 11.

[0059] According to actual needs, the target frequency band of each filter array 40 can be set so that the channel transmission branch 20 connected to it can realize the communication signal transmission of the corresponding target frequency band. For example, if it is necessary to speed up the data transmission speed, several channel transmission branches 20 can be selected to transmit simultaneously at different frequencies, that is, to transmit communication signals using different target frequency bands. If it is necessary to increase reliability, several channel transmission branches 20 can be transmitted at the same frequency, that is, to transmit communication signals using the same target frequency band, thereby achieving the effect of increasing signal strength. When the number of channel transmission branches 20 in the PLC communication device 100 is greater than 2, both same-frequency transmission and frequency division transmission can exist simultaneously, depending on the specific application environment, all of which are within the protection scope of this disclosure.

[0060] When different channel transmission branches 20 transmit at different frequencies, that is, when the corresponding filter arrays 40 simultaneously transmit communication signals of different target frequency bands, the physical channel of the frequency division multiplexing signal allows different frequency bands to be used to transmit communication signals on the external power cable 11 at the same time, realizing full-duplex carrier communication and improving the signal transmission rate. Traditional PLC communication suffers from crosstalk. During log export and rapid scheduling, polling crosstalk from other arrays may cause rapid scheduling command issuance to fail or take too long. However, the dual-frequency or even multi-frequency communication scheme provided in this embodiment can use the channel transmission branch 20 corresponding to another frequency band to avoid polling interference, quickly issue scheduling commands, and optimize scheduling time and success rate. When the external power cable 11 is a three-phase AC cable, the communication signals of the frequency division transmission can be transmitted using the same AC phase cable, such as using ab phase cables, or they can be transmitted using different AC phase cables, such as using ab phase, bc phase and ac phase respectively. In practical applications, the external power cable 11 can also be a three-phase four-wire AC cable to increase the available transmission paths. There is no limitation here, and it depends on the specific application environment. All of these are within the protection scope of this disclosure.

[0061] When different transmission branches 20 transmit at the same frequency, that is, when the corresponding filter arrays 40 simultaneously transmit communication signals of the same target frequency band, in order to avoid mutual interference between these transmission branches 20, it is necessary to set the following: the transmission direction of the communication signals of these transmission branches 20 must be the same, and the communication signals transmitted by these transmission branches 20 must be transmitted using different phases of the external power cable 11. For example, when the external power cable 11 is a three-phase AC cable, phases ab and bc, or phases ac and bc, or phases ab and ac. In practical applications, the external power cable 11 can also be a three-phase four-wire AC cable, as long as the phase wires used for the communication signals transmitted at the same frequency are not completely the same, depending on the specific application environment, all of which are within the protection scope of this disclosure.

[0062] The PLC communication device 100 provided in this embodiment is applicable to various application scenarios, such as string inverters or centralized inverters; it can also select frequency division transmission to speed up the propagation speed or select same frequency transmission to improve the transmission reliability according to the needs of the actual scenario.

[0063] In practical applications, the PLC circuit 10 can be a PLC chip or a circuit built with discrete components, depending on the specific application environment, and all are within the protection scope of this disclosure. The PLC circuit 10 has at least one communication channel, which connects to the outside world and receives and outputs communication signals through the channel port of the PLC circuit 10. The communication channel corresponds to the same frequency band as its connected transmission branch 20, and can modulate the data output by the processor 200 into a communication signal of the corresponding frequency band, or demodulate the communication signal of the corresponding frequency band into data that the processor 200 can receive.

[0064] In addition, the PLC communication device 100 can, as Figure 1 As shown, the number of PLC circuits 10 is greater than 1, and the number of communication channels in each PLC circuit 10 is greater than or equal to 1. For example, the number of communication channels in PLC circuit 10 can be set to 1. In this case, PLC circuit 10 corresponds one-to-one with channel transmission branch 20 (e.g., Figure 1 As shown in the figure, the PLC circuit 10 can use a PLC chip that already exists in the relevant technology.

[0065] Alternatively, the PLC communication device 100 can also be as follows: Figure 2 As shown, the number of PLC circuits 10 is one, and the number of communication channels in the PLC circuit 10 is greater than one. Each communication channel in the PLC circuit 10 receives and outputs communication signals through its corresponding channel. In this case, the PLC circuit 10 can be customized with a suitable PLC chip according to the number of communication channels required by the actual application environment.

[0066] In practical applications, when the number of PLC circuits 10 is greater than 1, there may also be a situation where the number of communication channels in PLC circuits 10 is greater than 1. In this case, each communication channel is connected to the corresponding channel transmission branch 20 (not shown in the figure), which is also within the protection scope of this disclosure.

[0067] In this system, among the devices communicating with the PLC, one device's PLC communication device 100 acts as the master node, while the PLC communication devices 100 of the other devices act as slave nodes. In practical applications, the structures of the master and slave nodes can be the same or different. The following explanation uses the example of the master and slave nodes having the same structure:

[0068] Figure 3 Both master and slave nodes adopt Figure 1 The structure shown is illustrated using two PLC circuits (10) and both employing PLC chips. The master and slave nodes each include two PLC chips (e.g., ...). Figure 3 The PLC chip 1 and PLC chip 2 shown in the diagram each modulate or demodulate a communication signal in a carrier frequency band, and transmit the communication signal through the corresponding filter array 40 and channel transmission branch 20 to achieve full-duplex dual-channel carrier communication. The carrier frequency band corresponding to each PLC chip is one of the frequency bands that can be transmitted by the corresponding channel transmission branch 20 and the corresponding filter array 40, that is, including the target frequency band of the corresponding filter array 40.

[0069] Figure 4 Both master and slave nodes adopt Figure 1 The structure shown, and the number of PLC circuits 10, are n, all using PLC chips as examples. For simplicity, the structure of the slave node is not shown in detail; please refer to the structure of the master node. Each master and slave node includes n PLC chips (e.g., ...). Figure 4 The PLC chips shown (1, 2, ..., n) are used to modulate or demodulate communication signals in a carrier frequency band and transmit the communication signals through the corresponding filter array 40 and channel transmission branch 20 to achieve full-duplex multi-channel carrier communication. n is an integer greater than 2, and its value is not limited. A larger value allows for more tasks to be performed in parallel, further improving communication speed.

[0070] Figure 5 Both master and slave nodes adopt Figure 2The structure shown is illustrated with a single PLC circuit 10 and a PLC chip as an example. In the master and slave nodes, there is a PLC chip, and the PLC chip includes two communication channels. Each communication channel is used to modulate or demodulate the communication signal of a carrier frequency band, and transmits the communication signal through the corresponding filter array 40 and channel transmission branch 20 to realize full-duplex dual-channel carrier communication.

[0071] Figure 6 Both master and slave nodes adopt Figure 2 The structure shown is illustrated with a single PLC circuit 10, using a PLC chip as an example. For simplicity, the structure of the slave node is not shown in detail; please refer to the structure of the master node. Each master and slave node includes a PLC chip with n communication channels. Each communication channel is used to modulate or demodulate a communication signal in a carrier frequency band and transmits the communication signal through a corresponding filter array 40 and channel transmission branch 20 to achieve full-duplex multi-channel carrier communication.

[0072] Figures 3 to 6 Each arrow in the diagram represents the transmission direction of the corresponding communication signal (e.g., communication signal 1, communication signal 2, or communication signal n), and the communication signals transmitted by different channel transmission branches 20 are displayed in different forms. Each communication channel includes a corresponding modulation module (a box labeled with the word "modulation" as shown in the diagram) and a demodulation module (a box labeled with the word "demodulation" as shown in the diagram). The modulation module is used to modulate the data to be output into a communication signal of the corresponding frequency band, and the demodulation module is used to demodulate the received communication signal into the corresponding data.

[0073] The various implementation schemes provided in this embodiment can improve the data transmission rate and achieve multi-task parallelism by using at least two communication channels to transmit data simultaneously. For example, the frequency band of one communication channel can be used for upgrades or fault recording and export, while the frequency band of another communication channel continues to be used for polling other tasks. It can also improve the success rate of key information, so that certain key information, such as rapid scheduling, can be transmitted using frequency bands that are staggered from polling, reducing the risk of packet loss and time delay caused by crosstalk.

[0074] Based on the above embodiments, this embodiment provides an example of the specific structure of the PLC communication device 100. For instance, the channel ports of its PLC circuit 10 include: the channel input terminal and the channel output terminal of the corresponding communication channel in the PLC circuit 10; such as... Figures 3 to 6 As shown, the external port of each modulation module is the channel output of the corresponding communication channel, and the external port of each demodulation module is the channel input of the corresponding communication channel; each modulation module is used to... Figure 1The processor 200 shown receives and adjusts data, and each demodulation module is used to transmit the demodulated data to... Figure 1 The processor 200 shown.

[0075] like Figures 3 to 6 As shown, the channel transmission branch 20 includes a receiving branch 202 and a transmitting branch 201; the filter array 40 includes a receiving filter subarray 402 and a transmitting filter subarray 401; wherein:

[0076] The input terminal of the receiving branch 202 is connected to the signal coupling circuit 30, and the output terminal of the receiving branch 202 is connected to the channel input terminal of the corresponding communication channel through the corresponding receiving filter subarray 402. The receiving branch 202 is used to receive the communication signal on the signal coupling circuit 30, and transmit the communication signal that the corresponding communication channel can receive to the channel input terminal of the corresponding communication channel through the corresponding receiving filter subarray 402.

[0077] The input terminal of the transmitting branch 201 is connected to the channel output terminal of the corresponding communication channel through the corresponding transmitting filter subarray 401, and the output terminal of the transmitting branch 201 is connected to the signal coupling circuit 30. The transmitting branch 201 is used to receive the communication signal output from the channel output terminal of the corresponding communication channel through the corresponding transmitting filter subarray 401, and transmit the received communication signal to the signal coupling circuit 30.

[0078] That is, Figures 3 to 6 The master and slave nodes shown can transmit communication signals to the signal coupling circuit 30 through their internal communication channels via the connected transmit filter subarray 401 and transmit branch 201. They can also receive communication signals of the corresponding frequency band from the communication signals on the signal coupling circuit 30 through the connected receive branch 202 and receive filter subarray 402. At the same time, different transmission branches 20 of the same node can be in the same working state, such as all receive branches 202 or all transmit branches 201 being in the same working state simultaneously. Alternatively, different types of branches can be in the working state, such as the receive branch 202 in one transmission branch 20 and the transmit branch 201 in another transmission branch 20 being in the same working state simultaneously.

[0079] In addition, in practical applications, the transmitting branch 201 may specifically include: an amplifier circuit; the input of the amplifier circuit is connected to the corresponding channel output through the corresponding transmitting filter subarray 401, and the output of the amplifier circuit is connected to the signal coupling circuit 30; the amplifier circuit is used to amplify and transmit the received communication signal.

[0080] The amplifier circuit may specifically use a PA (Power Amplifier), but is not limited to this. Other implementations in related technologies may also be used, all of which are within the protection scope of this disclosure.

[0081] The receiving branch 202 may specifically include a filtering receiving circuit; the input of the filtering receiving circuit is connected to the signal coupling circuit 30, and the output of the filtering receiving circuit is connected to the corresponding channel input through the corresponding receiving filter sub-array 402; the filtering receiving circuit is used to filter out noise outside the preset frequency band of the received communication signal, and to transmit the communication signal within the preset frequency band; that is, the filtering receiving circuit only allows communication signals within the preset frequency band to pass through, while filtering out communication signals in other frequency bands. The preset frequency band is within the frequency band corresponding to the communication channel connected to the filtering receiving circuit through the corresponding receiving filter sub-array 402. If the frequency band corresponding to the corresponding communication channel is 0.2 to 5.6 MHz, then the filtering receiving circuit must at least filter out noise outside this frequency band.

[0082] In practical applications, the preset frequency band can be the same as the frequency band corresponding to the corresponding communication channel. Alternatively, the preset frequency band can also be included within the frequency band corresponding to the corresponding communication channel, that is, the lower limit of the preset frequency band is greater than the lower limit of the frequency band corresponding to the corresponding communication channel, while the upper limit of the preset frequency band is less than the upper limit of the frequency band corresponding to the corresponding communication channel. In this case, the number of filter receiving circuits in the receiving branch 202 can be greater than 1, and each filter receiving circuit is connected in parallel, with each filter receiving circuit corresponding to a different preset frequency band. Since each preset frequency band is within the frequency band corresponding to the corresponding communication channel, the receiving branch 202 can transmit communication signals of different frequency bands on the signal coupling circuit 30 at the same time through different filter receiving circuits.

[0083] In addition, such as Figures 3 to 6 As shown, both the receiving filter subarray 402 and the transmitting filter subarray 401 may include at least two parallel-connected controllable filter branches, each including a filter branch and a controllable switch connected in series. For example, Figure 3 The receiving filter subarray 402 connected to the PLC chip 1 of the master node includes m1 controllable filter branches. The first controllable filter branch includes filter branch #1 and controllable switch K1 connected in series; the second controllable filter branch includes filter branch #2 and controllable switch K2 connected in series, and so on, until the m1th controllable filter branch includes filter branch #m1 and controllable switch Km1 connected in series. Since there is no limit to the number of controllable filter branches in each subarray (as long as it is greater than 1), the number of controllable filter branches in different subarrays can be the same or different. Figures 3 to 6The values ​​of m1 to m10 mentioned above can be any integer greater than 1, and their values ​​do not affect each other, depending on the specific application environment.

[0084] When its connected controllable switch is closed, the filter branch filters out noise outside a certain frequency band from the received communication signal and transmits the communication signal in that frequency band. In the same subarray, the frequency bands corresponding to each filter branch are the frequency bands that the subarray can transmit. In practical applications, for a subarray, the filter branch corresponding to the target frequency band can be selected to work according to the target frequency band setting. That is, by controlling the closed controllable switch connected to the filter branch, the subarray can achieve noise filtering outside the target frequency band.

[0085] Taking the receiving filter subarray 402 as an example, if the frequency band that its connected receiving branch 202 can transmit is 0 to 12 MHz, and the frequency band that its connected communication channel can modulate and demodulate is also 0 to 12 MHz, then: if the receiving filter subarray 402 includes 3 controllable filtering branches, the frequency bands that each filtering branch can transmit can be [0, 4) MHz, [4, 8) MHz, and [8, 12) MHz, respectively; if the receiving filter subarray 402 includes 4 controllable filtering branches, the frequency bands that each filtering branch can transmit can be [0, 3) MHz, [3, 6) MHz, [6, 9) MHz, and [9, 12) MHz, respectively. These are just some optional examples; other cases are also within the scope of protection. In addition, the frequency bands corresponding to each filtering branch can be of the same width or different widths, depending on the specific application environment, all of which are within the scope of protection of this disclosure.

[0086] In practical applications, each filter array 40 can be controlled by its connected PLC circuit 10, or they can all be controlled by the processor 200. That is, the PLC circuit 10 or the processor 200 can select the target frequency band of each sub-array by controlling the on and off of each controllable switch, so that each channel transmission branch 20 can autonomously select different frequencies to work according to the actual use environment.

[0087] This embodiment not only enables full-duplex carrier communication and multi-task parallelism, but also allows the communication channel to send or receive communication signals of different frequency bands at the same time, further improving the transmission rate.

[0088] Furthermore, based on the above embodiments, the configuration of the signal coupling circuit 30 in the PLC communication device 100 can also be different, for example:

[0089] like Figures 1 to 6As shown, in the PLC communication device 100, the number of signal coupling circuits 30 is 1, and each channel transmission branch 20 is connected to the external power cable 11 through this signal coupling circuit 30; that is, no matter how many channel transmission branches 20 exist in the PLC communication device 100, each channel transmission branch 20 shares the same signal coupling circuit 30.

[0090] Or, such as Figure 7 (in order to be in) Figure 4 (Based on the example shown) or Figure 8 (in order to be in) Figure 6 As shown in the example (based on the example shown), the number of signal coupling circuits 30 in this PLC communication device 100 can also be greater than one. In this case, each channel transmission branch 20 is connected to the external power cable 11 through its corresponding signal coupling circuit 30. For example, there can be a one-to-one correspondence between each channel transmission branch 20 and each signal coupling circuit 30 (e.g., ...). Figure 7 or Figure 8 (as shown in the figure), or, the signal coupling circuit 30 may be connected to at least two channel transmission branches 20 simultaneously (not shown), depending on the specific application environment, and all are within the protection scope of this disclosure.

[0091] In this embodiment, the number of signal coupling circuits 30 is not limited; moreover, the specific implementation of the signal coupling circuit 30 is not limited. For details, please refer to the relevant technologies. As long as bidirectional transmission of communication signals can be achieved, it is within the protection scope of this disclosure.

[0092] Other embodiments of this disclosure also provide a power electronic device, including the PLC communication device 100 as described in any of the above embodiments.

[0093] As an example, the power electronic device could be a power converter, such as... Figure 9 As shown, it includes: a main circuit 301 and a controller 302; wherein the main circuit 301 is controlled by the controller 302; the controller 302 includes a PLC communication device 100 as described in any of the above embodiments. The structure and working principle of the PLC communication device 100 can be found in the above embodiments, and will not be repeated here.

[0094] The main circuit 301 may include at least one stage of power conversion circuit. Each stage of power conversion circuit may be one of DC / DC conversion circuit, DC / AC conversion circuit and AC / AC conversion circuit. Each conversion circuit may adopt any topology in related technologies. There are no restrictions here. It depends on the specific application environment.

[0095] In practical applications, the controller 302 may include not only the PLC communication device 100, but also a processor 200 and at least one analog-to-digital converter circuit (AD as shown in the figure) 201. The processor 200 receives electrical parameter sampling information from the main circuit 301 through the analog-to-digital converter circuit 201, and then performs logical processing on the electrical parameter sampling information to generate a corresponding control signal. The control signal is then output to the drive circuit 303 to achieve the operation control of the main circuit 301 through the drive circuit 303.

[0096] The processor 200 also enables PLC communication with other devices via the PLC communication device 100, such as PLC communication with other power converters or the main controller in the system. In practical applications, the power cable on either side of the main circuit 301 (the thick solid line shown in the figure) can be used as the external power cable 11 described in the above embodiment. That is, the outside of the PLC communication device 100 can be coupled to the power cable on either side of the main circuit 301, which is not limited here.

[0097] In practical applications, the processor 200 can perform tasks such as fast scheduling, log export, upgrade, and polling through PLC communication. For example, it can upload the aforementioned electrical parameter sampling information or obtain electrical parameter control instructions for the main circuit 301. These electrical parameter control instructions can provide the processor 200 with reference values ​​of electrical parameters for controlling the operation of the main circuit 301 to complete the aforementioned fast scheduling tasks.

[0098] By employing the PLC communication device 100, this power converter can achieve full-duplex carrier communication and multi-task parallelism, thereby improving transmission speed.

[0099] As another example, the power electronic device may be an MLPE (Module-Level Power Electronics) device, including: a PLC communication device 100 as described in any of the above embodiments. The structure and working principle of the PLC communication device 100 can be found in the above embodiments, and will not be repeated here.

[0100] The MLPE device can be a shutdown device or an optimizer, etc. In practical applications, the input terminal of the MLPE device can be connected to at least one DC power source, and the output terminals of multiple MLPE devices are connected in series to form a corresponding power string, which can be connected to the DC side of the power converter. In practical applications, the DC side of the power converter can have at least one input, each input is connected to one power string or at least two power strings connected in parallel. When the DC power source is a photovoltaic module, the power converter can be used as a photovoltaic inverter; when the DC power source is a battery, the power converter can be used as an energy storage converter.

[0101] The specific structure of this MLPE device can be found in relevant technologies, and will not be elaborated here.

[0102] The MLPE device can achieve PLC communication with other devices through its internal PLC communication device 100, such as PLC communication with power converters such as the aforementioned photovoltaic inverters or energy storage converters, or PLC communication with other MLPE devices.

[0103] By adopting the PLC communication device 100, the MLPE equipment can improve the flexibility of data transmission, and can also realize full-duplex carrier communication and multi-task parallelism, thereby improving the transmission speed.

[0104] As another example, the power electronic device can be a data acquisition unit, including a PLC communication device 100 as described in any of the above embodiments. The structure and working principle of the PLC communication device 100 can be found in the above embodiments, and will not be repeated here.

[0105] The data acquisition device acquires data from other devices through the PLC communication device 100, such as enabling PLC communication with multiple power converters. The data acquisition device can summarize the operating data of each power converter, such as the aforementioned electrical parameter sampling information, and transmit it to the monitoring center.

[0106] The specific structure of this data acquisition device can be found in relevant technologies, and will not be elaborated here.

[0107] By employing the PLC communication device 100, this data acquisition unit can improve the flexibility of data transmission, and can also realize full-duplex carrier communication and multi-task parallelism, thereby increasing the transmission speed.

[0108] As an example, such as Figure 10 As shown, the power electronic device may include: a power converter 402 as described in the above embodiments, and at least one MLPE device 401 as described in the above embodiments; wherein the MLPE device 401 is connected to the DC side of the power converter 402. The power converter 402 and the MLPE device 401 may be integrated or discretely configured. When discretely configured, the power electronic device may also be referred to as a power conversion system.

[0109] The power converter 402 can have at least one input on its DC side. Figure 10The example shown uses one input, but in practical applications, the DC side of the power converter 402 can have at least two inputs, which is not limited here. Each input can be connected to a power string or at least two power strings connected in parallel. The power string includes multiple MLPE devices 401 with their outputs connected in series. The input of each MLPE device 401 is used to connect to at least one DC power source. When the DC power source is a photovoltaic module, the power converter 402 can be used as a photovoltaic inverter; when the DC power source is a battery, the power converter 402 can be used as an energy storage converter.

[0110] The MLPE device 401 and the power converter 402 each include a corresponding PLC communication device 100. The structure and working principle of the PLC communication device 100 can be found in the above embodiments and will not be repeated here. The PLC communication device 100 in the power converter 402 can act as a master node, and the PLC communication device 100 in the MLPE device 401 can act as a slave node. Thus, through corresponding PLC communication, the flexibility of data transmission is improved, and full-duplex carrier communication and multi-task parallelism are realized, thereby improving the transmission speed.

[0111] The other side of the power converter 402 can be an AC side, used to connect to the power grid and / or a load. In this case, the main circuit in the power converter 402 can be a DC / AC conversion circuit, and the specific topology is not limited. Of course, the other side of the power converter 402 can also be a DC side; this is not limited here, but depends on the specific application environment, and all are within the protection scope of this disclosure.

[0112] As an example, such as Figure 11 As shown, the power electronic device may include: a main controller 502 and at least one ( Figure 11 (Multiple examples are shown below) Power converter 501. Since the main controller 502 and the power converter 501 are separate devices located in different areas, this power electronic device can also be called a power conversion system.

[0113] The power converter 501 is the power converter described in the above embodiments. Its main circuit may include at least one stage of power conversion circuit. Each stage of power conversion circuit may be one of DC / DC conversion circuit, DC / AC conversion circuit and AC / AC conversion circuit. Each conversion circuit may adopt any topology in related technologies. There is no limitation here. It depends on the specific application environment. Figure 11 The power converter 501 is used as an example of an inverter. In this case, its DC side is used to connect to a DC power supply, and its AC side can be connected in parallel.

[0114] The power converter 501 and the main controller 502 communicate via a power cable. The main controller 502 includes a PLC communication device 100 as described in the above embodiments. The structure and working principle of the PLC communication device 100 can be found in the above embodiments and will not be repeated here.

[0115] The PLC communication device 100 in the main controller 502 can act as a master node, and the PLC communication device 100 in the power converter 501 can act as a slave node. Through the corresponding PLC communication, the flexibility of data transmission is improved, and full-duplex carrier communication and multi-task parallelism are realized, thereby improving the transmission speed.

[0116] In practical applications, the main controller 502 can be a central controller, a data acquisition unit, or an energy management system; this is not limited to any particular application environment, and all are within the scope of this disclosure. When the main controller 502 is a data acquisition unit, it can at least aggregate the operating data of each power converter 501 through the internal PLC communication device 100 and transmit it to the monitoring center. When the main controller 502 is a central controller or a capacity management system, it can at least achieve rapid scheduling of each power converter 501. The specific functions and implementation forms of the central controller, data acquisition unit, and energy management system can be found in related technologies, and will not be elaborated here.

[0117] Similar or identical parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the description of the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment solution according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0118] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0119] The features described above regarding the disclosed embodiments can be substituted or combined with each other to enable those skilled in the art to implement or use this disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A PLC communication device, characterized in that, include: The system includes a PLC circuit, a signal coupling circuit, at least two transmission channels, and at least two filter arrays; among which... The channel ports of the PLC circuit are connected to the signal coupling circuit in sequence through the corresponding filter array and the channel transmission branch; The signal coupling circuit is also used to connect the external power cable of the PLC communication device; Each of the filter arrays is configured to transmit communication signals in a target frequency band, which is any one of at least two frequency bands that the filter array can transmit.

2. The PLC communication device according to claim 1, characterized in that, There are at least two of the filter arrays simultaneously transmitting communication signals in different target frequency bands.

3. The PLC communication device according to claim 1, characterized in that, There are at least two of the filter arrays, which transmit communication signals of the same target frequency band simultaneously and in the same direction through different phases of the external power cable.

4. The PLC communication device according to claim 1, characterized in that, The number of PLC circuits is greater than 1, and the number of communication channels in each PLC circuit is greater than or equal to 1; the communication channels receive and output the communication signals through the channel ports of the PLC circuits.

5. The PLC communication device according to claim 1, characterized in that, The number of PLC circuits is 1, and the number of communication channels in the PLC circuits is greater than 1. Each of the communication channels receives and outputs the communication signal through the corresponding channel port of the PLC circuit.

6. The PLC communication device according to any one of claims 1 to 5, characterized in that, Each of the filter arrays is controlled by either the PLC circuit to which it is connected or the processor to which the PLC circuit is connected.

7. The PLC communication device according to any one of claims 1 to 5, characterized in that, The channel ports of the PLC circuit include: the channel input terminal and the channel output terminal of the corresponding communication channel in the PLC circuit; The channel transmission branch includes: a receiving branch and a transmitting branch; The filter array includes: a receiving filter subarray and a transmitting filter subarray; The input terminal of the receiving branch is connected to the signal coupling circuit, and the output terminal of the receiving branch is connected to the channel input terminal of the corresponding communication channel through the corresponding receiving filter subarray; the receiving branch is used to receive the communication signal on the signal coupling circuit, and transmit the communication signal that the corresponding communication channel can receive to the channel input terminal of the corresponding communication channel through the corresponding receiving filter subarray; The input terminal of the transmitting branch is connected to the channel output terminal of the corresponding communication channel through the corresponding transmitting filter subarray, and the output terminal of the transmitting branch is connected to the signal coupling circuit; the transmitting branch is used to receive the communication signal output by the channel output terminal of the corresponding communication channel through the corresponding transmitting filter subarray, and transmit the received communication signal to the signal coupling circuit.

8. The PLC communication device according to claim 7, characterized in that, The transmitting branch includes: an amplifier circuit; The input terminal of the amplifier circuit is connected to the corresponding channel output terminal through the corresponding transmitting filter subarray; The output terminal of the amplifier circuit is connected to the signal coupling circuit. The amplifier circuit is used to amplify and transmit the received communication signals.

9. The PLC communication device according to claim 7, characterized in that, The receiving branch includes: a filtered receiving circuit; The input terminal of the filter receiving circuit is connected to the signal coupling circuit; The output terminal of the filter receiving circuit is connected to the corresponding channel input terminal through the corresponding receiving filter sub-array; The filtering receiving circuit is used to filter out noise outside the preset frequency band of the received communication signal, and to transmit the communication signal in the preset frequency band; the preset frequency band is within the frequency band corresponding to the corresponding communication channel.

10. The PLC communication device according to claim 9, characterized in that, The number of filter receiving circuits in the receiving branch is greater than 1, and each filter receiving circuit is connected in parallel. Each filter receiving circuit corresponds to a different preset frequency band.

11. The PLC communication device according to claim 7, characterized in that, Both the receiving filter subarray and the transmitting filter subarray include at least two parallel-connected controllable filter branches, each of which includes a filter branch connected in series and a controllable switch.

12. The PLC communication device according to any one of claims 1 to 5, characterized in that, The number of signal coupling circuits is 1, and each of the channel transmission branches is connected to the external power cable through the signal coupling circuit. Alternatively, the number of signal coupling circuits is greater than 1, and each of the channel transmission branches is connected to the external power cable through the corresponding signal coupling circuit.

13. A power electronic device, characterized in that, Includes the PLC communication device as described in any one of claims 1 to 12.

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