Power line carrier communication performance enhancement device

Abstract

This application discloses a power line carrier communication performance enhancement device, belonging to the field of communication technology. The device includes a frequency band selection module, a first end-side adaptation module, and a second end-side adaptation module. The first and second end-side adaptation modules are respectively connected to both sides of the frequency band selection module, forming a bypass transmission path for the carrier communication signal to bypass the target power equipment. This application can establish a low-attenuation transmission path for the target carrier communication frequency band without affecting the target power equipment's processing functions for power frequency power signals and low-frequency harmonic signals. This reduces the attenuation or blocking effect of harmonic mitigation equipment and switching equipment on carrier communication signals in complex power line scenarios, improving the reliability, stability, and coverage of power line carrier communication.

Description

Technical Field

[0001] This application belongs to the field of communication technology, and in particular relates to a device for enhancing the performance of power line carrier communication. Background Technology

[0002] When power electronic equipment in a power system is working, it is easy to generate a large number of high-frequency harmonic signals, which leads to a decrease in the fundamental power factor, an increase in the reactive power ratio, occupancy of the effective capacity of transformers, impact on power quality, and even cause malfunctions of relay protection systems, resulting in power grid accidents.

[0003] To mitigate harmonics, related technologies typically involve installing reactors, isolation transformers, and other equipment in lines near power electronic devices. Reactors rely on inductive reactance to suppress high-frequency harmonic currents, reducing harmonic spikes and current change rates, protecting equipment, and improving waveforms. Isolation transformers use electromagnetic coupling to isolate zero-sequence harmonics, DC components, and some interference, reducing the transmission of harmonics to the upstream power grid. Common high-frequency harmonic energy in power grids is concentrated below 100kHz, primarily consisting of characteristic harmonics of the 50Hz fundamental frequency and harmonics near the PWM (Pulse Width Modulation) switching of power switching devices. Harmonic mitigation equipment typically exhibits low-pass transmission characteristics, allowing the 50Hz fundamental frequency energy to pass while attenuating and suppressing higher-frequency signals.

[0004] However, High Speed ​​Power Line Communication (HPLC) signals typically operate in the MHz range, such as 0.7MHz to 12MHz. This means that when harmonic mitigation devices such as reactors and isolation transformers are present in the power line, these devices, while suppressing harmonics, also significantly attenuate the HPLC signal, affecting meter reading success rate and communication reliability. Furthermore, when circuit breakers, disconnectors, and other switching devices are in the open state, the physical connection of the power line is interrupted, and power line-based carrier communication may also be interrupted, hindering fault reporting, abnormal event location, and remote maintenance. Summary of the Invention

[0005] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a power line carrier communication performance enhancement device to construct a bypass transmission path for carrier communication signals in complex power line scenarios, thereby reducing the attenuation or blocking effect of target power equipment on carrier communication signals.

[0006] This application provides a power line carrier communication performance enhancement device, including a frequency band selection module, a first end-side adaptation module, and a second end-side adaptation module. The first end-side adaptation module and the second end-side adaptation module are respectively connected to both sides of the frequency band selection module and are symmetrically arranged with respect to the frequency band selection module; wherein: The first end-side adapter module is used to access the power line at one end of the target power equipment, couple the carrier communication signal from the power line at one end of the target power equipment, suppress the power frequency power signal from entering the power line carrier communication performance enhancement device, and adapt the power line side impedance to the working impedance of the frequency band selection module. The frequency band selection module is used to allow signals within the target carrier communication frequency band to pass through under the operating impedance, and to suppress signals outside the target carrier communication frequency band; The second end-side adapter module is used to connect to the power line at the other end of the target power equipment and couple the carrier communication signal processed by the frequency band selection module to the power line at the other end of the target power equipment. The first end-side adaptation module, the frequency band selection module, and the second end-side adaptation module together form a bypass transmission path for the carrier communication signal to bypass the target power equipment.

[0007] In some embodiments, both the first end-side adapter module and the second end-side adapter module include a coupling unit, an impedance matching unit, and a high-frequency isolation unit disposed between the corresponding end power line and the frequency band selection module; wherein, along the connection direction from the coupling unit to the frequency band selection module, the coupling unit, the impedance matching unit, and the high-frequency isolation unit are connected sequentially; wherein: The coupling unit is used to couple carrier communication signals and suppress the entry of power frequency power signals; The impedance matching unit is used to adapt the power line side impedance to the operating impedance of the frequency band selection module. The high-frequency isolation unit is used to isolate and transmit carrier communication signals.

[0008] In some embodiments, the coupling unit includes a capacitive coupling circuit, which is connected in series in the transmission path of the carrier communication signal to allow the carrier communication signal to enter the power line carrier communication performance enhancement device and to block the power frequency power signal.

[0009] In some embodiments, the impedance matching unit includes a π-type impedance matching circuit, which is used to convert the power line side impedance into an operating impedance suitable for the frequency band selection module.

[0010] In some embodiments, the π-type impedance matching circuit includes a high-frequency inductor, a high-frequency capacitor, and a damping device, wherein the damping device is used to suppress resonant spikes in the π-type impedance matching circuit.

[0011] In some embodiments, the first end-side adapter module and the second end-side adapter module further include a protection unit disposed between the coupling unit and the impedance matching unit, the protection unit being used to suppress surge interference and / or transient spike interference in the power line.

[0012] In some embodiments, the protection unit includes a gas discharge tube and / or a transient voltage suppression tube.

[0013] In some embodiments, the high-frequency isolation unit includes a high-frequency isolation transformer, which is disposed between the impedance matching unit and the frequency band selection module.

[0014] In some embodiments, the frequency band selection module includes a high-pass filter unit and a low-pass filter unit, which are cascaded to form a band-pass filter path. The band-pass filter path is used to configure the passband range according to the target carrier communication frequency band used by the carrier communication signal.

[0015] In some embodiments, the target power equipment includes harmonic mitigation equipment and / or switching equipment.

[0016] In some embodiments, the harmonic mitigation equipment includes reactors and / or isolation transformers, and the switching equipment includes circuit breakers and / or disconnect switches.

[0017] In some embodiments, when the target power equipment is a switch-type device and the switch-type device is in an open state, the bypass transmission path is used to allow the carrier communication signal to be transmitted across both ends of the switch-type device.

[0018] In some embodiments, when the target power equipment is a harmonic mitigation device, the bypass transmission path is used to allow the carrier communication signal to bypass the harmonic mitigation device for transmission, and to enable the harmonic mitigation device to maintain its processing function for power frequency power signals and / or low-frequency harmonic signals.

[0019] In some embodiments, the power line carrier communication performance enhancement device is a passive device.

[0020] In some embodiments, the power line carrier communication performance enhancement device is used in single-phase power line carrier communication scenarios or three-phase power line carrier communication scenarios; wherein: In the single-phase power line carrier communication scenario, the first end-side adapter module is used to connect the live wire and neutral wire at one end of the target power equipment, and the second end-side adapter module is used to connect the live wire and neutral wire at the other end of the target power equipment. In the three-phase power line carrier communication scenario, each phase line is equipped with a first end-side adaptation module, a frequency band selection module, and a second end-side adaptation module.

[0021] The power line carrier communication performance enhancement device provided in this application, through a first end-side adaptation module, a frequency band selection module, and a second end-side adaptation module, forms a bypass transmission path for carrier communication signal transmission between the two ends of the target power equipment. This allows the carrier communication signal to bypass the target power equipment for transmission without directly passing through equipment such as reactors, isolation transformers, circuit breakers, and disconnect switches, which may cause high-frequency attenuation, blockage, or physical disconnection. This reduces the transmission loss of the HPLC signal caused by the target power equipment and improves communication continuity and reliability in complex power line environments. Simultaneously, the first end-side adaptation module couples the carrier communication signal from the power line, suppresses power frequency signals from entering the device, and adapts the power line-side impedance to the operating impedance of the frequency band selection module. This ensures that the carrier communication signal obtains more stable transmission conditions before entering the frequency band selection module, reducing impedance mismatch and signal reflection loss caused by changes in field load, line topology, or line length. The frequency band selection module further allows signals within the target carrier communication frequency band to pass through, while suppressing noise, harmonics, and interference signals outside the target carrier communication frequency band. The second-side adapter module then couples the processed carrier communication signal back to the power line at the other end of the target power equipment. Thus, without altering the original power frequency transmission path or affecting the original function of the target power equipment, the penetration capability, anti-interference capability, communication stability, and data acquisition success rate of the HPLC signal can be improved.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram illustrating the attenuation effect of a reactor or isolation transformer on HPLC communication signals provided in the embodiments of this application; Figure 2 This is a schematic diagram illustrating the impact of a switching device provided in an embodiment of this application on the interruption of the HPLC communication link; Figure 3This is a schematic diagram of the module structure of the power line carrier communication performance enhancement device provided in the embodiments of this application; Figure 4 This is a schematic diagram of the module structure of the end-side adapter module provided in the embodiments of this application; Figure 5 This is a schematic diagram of the circuit structure of the capacitive coupling circuit and protection device provided in the embodiments of this application; Figure 6 This is a schematic diagram of the circuit structure of the π-type impedance matching circuit and the high-frequency isolation transformer provided in the embodiments of this application; Figure 7 This is a schematic diagram of the module structure of the power line carrier communication performance enhancement device with a protection unit provided in the embodiments of this application; Figure 8 This is a schematic diagram of the circuit structure of the bandpass filter path provided in the embodiments of this application; Figure 9 This is a schematic diagram of the test results of the bandpass filter path provided in the embodiments of this application; Figure 10 This is a schematic diagram of the overall circuit structure of the power line carrier communication performance enhancement device provided in the embodiments of this application; Figure 11 This is a schematic diagram illustrating the signal penetration scenario of the power line carrier communication performance enhancement device provided in this application embodiment applied to both ends of a reactor or isolation transformer; Figure 12 This is a schematic diagram of the signal transmission characteristics of the target power equipment combined with the power line carrier communication performance enhancement device provided in the embodiments of this application; Figure 13 This is a schematic diagram of the power line carrier communication performance enhancement device provided in this application embodiment applied to a signal enhancement scenario in a strong interference environment; Figure 14 This is a schematic diagram of a power line carrier communication performance enhancement device provided in this application being applied to signal enhancement scenarios at both ends of a switchgear. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments that can be directly obtained based on the embodiments of this application are within the scope of protection of this application.

[0025] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0026] To facilitate the explanation of the technical problems to be solved by the embodiments of this application, the following will first be combined with Figure 1 and Figure 2 This paper describes typical line conditions that affect HPLC communication in complex power line scenarios.

[0027] It should be noted that, Figure 1 and Figure 2 This is only intended to illustrate how different electrical devices affect HPLC communication signals and does not constitute a limitation on actual circuit structure, equipment specifications, or signal amplitude ratio.

[0028] like Figure 1 As shown, after a reactor or isolation transformer is connected to a power line, it exhibits different transmission characteristics for different frequency components. For 50Hz power frequency AC, the reactor or isolation transformer can still transmit power according to its original function. Figure 1 The AC power at the lower center remains essentially continuous before and after passing through the reactor or isolation transformer. For the high-frequency carrier communication signal used in HPLC, because its frequency is much higher than the power frequency, factors such as the inductive reactance of the reactor, the winding characteristics of the isolation transformer, leakage inductance, parasitic parameters, and magnetic material losses cause significant attenuation of the high-frequency carrier communication signal when passing through such equipment. Figure 1 The high-frequency signal in the upper middle section has a significantly reduced amplitude after passing through a reactor or isolation transformer. This is used to illustrate that although such equipment does not affect the transmission of power frequency electricity, it will reduce the receivable energy of the HPLC signal, which in turn leads to a decrease in the signal-to-noise ratio at the receiving end, an increase in the bit error rate, an increase in the number of retransmissions, and ultimately affects the meter reading success rate and communication reliability.

[0029] In other words, while the power line remains connected in terms of power frequency transmission and the power equipment continues to perform its harmonic mitigation, isolation, or power transmission functions, it creates a high-frequency transmission bottleneck for HPLC communication. Existing HPLC communication modules typically only passively receive attenuated weak signals at the receiving end and cannot eliminate the attenuation of high-frequency carrier communication signals caused by reactors or isolation transformers along the channel path.

[0030] For example Figure 2 As shown, the impact of switching devices on HPLC communication and Figure 1 The effects of the reactor or isolation transformer shown differ. When switching equipment is in the closed state, the power lines at both ends are physically connected, and the HPLC carrier communication signal can continue to be transmitted along the power lines. Figure 2 The above indicates that HPLC communication is normal. However, when switching devices are in the open state, the physical connection between the power lines at both ends is severed, and the HPLC carrier communication signal cannot continue to transmit across the open gap. Therefore... Figure 2 The image below shows an HPLC communication interruption.

[0031] Depend on Figure 2 It is evident that the problem caused by switchgear is not simply signal attenuation, but rather a break in the communication path topology. In this scenario, even if the HPLC communication module itself has high receiving sensitivity or anti-attenuation capability, it cannot solve the communication interruption problem caused by a broken line. Especially in cases of fault tripping or abnormal circuit breaking, nodes downstream or on the other side of the switchgear may be unable to continue transmitting fault information or operating status information to upstream nodes through the original power line link, thereby affecting fault reporting, anomaly location, and remote operation and maintenance.

[0032] Furthermore, the actual power line channel environment is quite complex. Field lines typically experience significant noise interference, and line impedance varies with factors such as load, topology, and distance, making it not a constant ideal impedance. Therefore, the anti-attenuation capability and receiving sensitivity of HPLC communication equipment in actual field operations may differ from laboratory test results. In complex power line scenarios, it is prone to problems such as severe signal attenuation, low meter reading success rate, and data transmission delays, making it difficult to achieve ideal acquisition and communication effects. This, in turn, affects the real-time performance, continuity, and reliability of electricity information acquisition.

[0033] therefore, Figure 1 and Figure 2 These correspond to two typical problems in complex power line communication environments: Figure 1 The problem of high-frequency carrier signals being attenuated by power equipment leads to a decrease in HPLC communication quality; Figure 2 The issue of the physical connection of the power line being severed by switching equipment caused a direct interruption of the HPLC communication link. All of the above problems indicate that relying solely on the passive reception capabilities of the HPLC communication module itself is insufficient to adequately address the complex field line conditions in distribution areas.

[0034] In view of this, embodiments of this application provide a power line carrier communication performance enhancement device. This device can be connected in parallel across both ends of a target power equipment. By constructing a bypass transmission path adapted to the HPLC communication frequency band, the carrier communication signal can bypass the aforementioned high-frequency attenuation points or physical disconnection points during transmission. This device can achieve separate transmission of the carrier communication signal and the power frequency signal, and selectively pass through the target carrier communication frequency band, thereby reducing the obstruction and attenuation of the HPLC signal caused by the target power equipment, and reducing channel loss and noise interference. Thus, without relying solely on receiver compensation, the HPLC communication quality in complex power line environments can be improved from the transmission path side, enhancing the penetration capability, stability, coverage, data acquisition success rate, and real-time transmission performance of HPLC communication in complex transformer substations.

[0035] To facilitate understanding, some terms involved in the embodiments of this application will be explained below.

[0036] HPLC refers to high-speed power line carrier communication, a communication method that uses existing power lines as the communication medium, superimposing high-frequency carrier communication signals onto the power lines for data transmission. Compared to 50Hz power frequency signals, the carrier communication signals used in HPLC are in a higher frequency band, and therefore can be distinguished from power frequency signals by frequency difference.

[0037] Carrier communication signals refer to high-frequency signals used to carry communication data and transmit it over power lines. In the embodiments of this application, carrier communication signals mainly refer to HPLC signals, but can also be other high-frequency communication signals suitable for power line carrier communication.

[0038] Power frequency power signal refers to the AC signal used to transmit electrical energy in power lines, such as a 50Hz AC power signal. Power frequency power signal is mainly used for power transmission, and its frequency is lower than the carrier communication signal used by HPLC.

[0039] The target carrier communication frequency band refers to the frequency range actually used by the carrier communication signal. The frequency band selection module allows signals within the band to pass through and suppresses noise, harmonics, or other interference signals outside the band.

[0040] In some embodiments, the target carrier communication frequency band used for HPLC communication can be located in the range of 0.7MHz to 12MHz. For target power equipment such as reactors and isolation transformers, this frequency band may cause significant attenuation of the carrier communication signal, for example, attenuation can reach more than 30dB, resulting in a decrease in the signal energy at the receiving end, an increase in the bit error rate, and a decrease in the communication success rate. The power line carrier communication performance enhancement device provided in this application embodiment mainly operates on the high-frequency band used for communication, such as the band above 500KHz, to provide a bypass transmission path for the HPLC signal.

[0041] The target power equipment refers to power equipment installed in power lines that may attenuate, block, or interrupt the transmission of carrier communication signals. For example, the target power equipment may be a reactor, isolation transformer, circuit breaker, disconnector, or other equipment installed in a power line. The target power equipment is still connected to the power system in its original manner to perform harmonic mitigation, isolation, interruption, or other power functions. The apparatus provided in this application does not replace the target power equipment itself.

[0042] Power line impedance refers to the equivalent impedance presented by the power line to the carrier communication signal at the location where the device is connected. Due to differences in factors such as field load, line length, and line topology, power line impedance may vary.

[0043] Operating impedance refers to the impedance conditions under which the frequency band selection module is suitable for operation. By adapting the power line side impedance to the operating impedance of the frequency band selection module through an end-side adapter module, reflection loss of carrier communication signals during transmission within the device can be reduced.

[0044] like Figure 3 As shown, the power line carrier communication performance enhancement device 10 provided in this application embodiment can be connected in parallel across both ends of the target power equipment to provide a bypass transmission path for carrier communication signal transmission between the two ends of the target power equipment.

[0045] The power line carrier communication performance enhancement device 10 includes a first end-side adaptation module 101, a frequency band selection module 102, and a second end-side adaptation module 103. The first end-side adaptation module 101 and the second end-side adaptation module 103 are respectively connected to both sides of the frequency band selection module 102 and are symmetrically arranged with respect to the frequency band selection module 102.

[0046] The first end-side adapter module 101 is used to connect to the power line at one end of the target power equipment, couple the carrier communication signal from the power line at that end, suppress the power frequency power signal from entering the device, and adapt the power line impedance to the working impedance of the frequency band selection module 102. The frequency band selection module 102 is used to allow signals within the target carrier communication frequency band to pass through under the adapted working impedance conditions, and suppress signals outside the target carrier communication frequency band. The second end-side adapter module 103 is used to connect to the power line at the other end of the target power equipment, and recouple the carrier communication signal processed by the frequency band selection module 102 to the other end power line.

[0047] Therefore, the carrier communication signal can bypass the target power equipment body directly, but instead be transmitted by passing through the first end-side adaptation module 101, the frequency band selection module 102, and the second end-side adaptation module 103 in sequence. This bypass transmission path is not a simple wire connection, but rather, through end-side adaptation, frequency band selection, and recoupling, the carrier communication signal is transmitted with low loss within the target carrier communication frequency band, while suppressing power frequency signals and out-of-band interference signals from entering the device.

[0048] In practical applications, the impedance of the power line side is affected by factors such as load conditions, line length, and line topology. If the carrier communication signal is directly introduced into the frequency band selection module 102, impedance mismatch, signal reflection, and transmission loss are likely to occur. Impedance matching through the first end-side adaptation module 101 can place the carrier communication signal entering the frequency band selection module 102 under more suitable transmission conditions. By filtering the target carrier communication frequency band through the frequency band selection module 102, the effective carrier communication signal can continue to be transmitted to the second end-side adaptation module 103, and the possibility of out-of-band harmonics, noise, or other interference signals continuing to propagate along the bypass transmission path is reduced.

[0049] With the above structure, even when the target power equipment causes attenuation, blockage, or communication interruption to the HPLC signal, the power line carrier communication performance enhancement device 10 can still provide an independent transmission path for the carrier communication signal, thereby improving the communication continuity and reliability in complex power line environments. Since the bypass transmission path can reduce high-frequency attenuation and out-of-band interference caused by the target power equipment, the single-hop transmission capability of the carrier communication signal in complex distribution areas can also be improved. This helps reduce dependence on relay nodes, simplifies the distribution area carrier communication network topology, and reduces network complexity and operation and maintenance costs.

[0050] In some embodiments, both the first end-side adaptation module and the second end-side adaptation module include a coupling unit, an impedance matching unit, and a high-frequency isolation unit disposed between the corresponding end power line and the frequency band selection module; wherein, along the connection direction from the coupling unit to the frequency band selection module, the coupling unit, the impedance matching unit, and the high-frequency isolation unit are connected in sequence; wherein: the coupling unit is used to couple carrier communication signals and suppress the entry of power frequency power signals; the impedance matching unit is used to adapt the power line side impedance to the operating impedance of the frequency band selection module; and the high-frequency isolation unit is used to isolate the transmission of carrier communication signals.

[0051] like Figure 4As shown, the second end-side adapter module 103 includes a coupling unit 1031, an impedance matching unit 1032, and a high-frequency isolation unit 1033. The arrangement of the coupling unit 1031, impedance matching unit 1032, and high-frequency isolation unit 1033 corresponds to that of the first end-side adapter module 101. Specifically, the coupling unit 1031 is used to recouple the carrier communication signal processed by the frequency band selection module 102 to the power line at the other end of the target power equipment; the impedance matching unit 1032 is used to match the impedance of the corresponding power line side with the operating impedance of the frequency band selection module 102; and the high-frequency isolation unit 1033 is used to isolate and transmit the carrier communication signal on the output side. Thus, the first end-side adapter module 101 and the second end-side adapter module 103 form a symmetrical end-side access structure, enabling the device to both introduce carrier communication signals from one end of the target power equipment and output the processed carrier communication signals to the other end of the target power equipment.

[0052] With the above structure, an independent high-frequency transmission path for carrier communication signals can be provided without changing the original power function of the target power equipment, thereby improving the continuity and reliability of HPLC communication in complex power line environments.

[0053] In some embodiments, the coupling unit includes a capacitive coupling circuit, which is connected in series in the transmission path of the carrier communication signal to allow the carrier communication signal to enter the power line carrier communication performance enhancement device and to block the power frequency power signal.

[0054] Capacitive coupling circuits utilize the principle that capacitors exhibit different impedance characteristics to signals of different frequencies, allowing high-frequency carrier communication signals to pass through while suppressing 50Hz power frequency signals. Specifically, the capacitive coupling circuit may include safety capacitors that meet power system safety requirements. These safety capacitors are connected in series in the transmission path of the carrier communication signal, enabling the carrier communication signal to couple into the device from the power line. Since the frequency of the power frequency signal is much lower than that of the carrier communication signal, the capacitive coupling circuit presents a higher impedance to the power frequency power signal, thereby reducing the possibility of the power frequency power signal entering the bypass transmission path. In this way, an independent high-frequency access path for the carrier communication signal can be established without altering the original power frequency power supply path.

[0055] like Figure 5As shown, the capacitive coupling circuit can be set between the live wire L and neutral wire N of the power line and the internal signal terminals SIG_P and SIG_N of the device. Specifically, a safety capacitor is connected in series on the signal path corresponding to the live wire L, and another safety capacitor is connected in series on the signal path corresponding to the neutral wire N. The two safety capacitors are used to couple the differential carrier communication signal in the power line to the SIG_P and SIG_N signal terminals inside the device, respectively. Since capacitors exhibit different impedance characteristics for different frequency signals, the capacitive coupling circuit presents a lower impedance for the high-frequency carrier communication signal used by HPLC, allowing the carrier communication signal to enter the device through capacitive coupling; for the 50Hz power frequency signal, the capacitive coupling circuit presents a higher impedance, thereby suppressing the power frequency signal.

[0056] Furthermore, Figure 5 The diagram also shows a protection device connected between SIG_P and SIG_N. This device can clamp or discharge transient overvoltages between SIG_P and SIG_N to reduce the impact of surge interference or switching spikes on downstream circuits. Through the cooperation of the capacitive coupling circuit and the protection device, carrier communication signals can be coupled from the power line into the power line carrier communication performance enhancement device, while power frequency power signals are blocked from entering the bypass transmission path, reducing the impact of power line transient interference on the internal communication link of the device. In this way, an independent high-frequency access path for carrier communication signals can be established without changing the original power frequency power supply path.

[0057] In some embodiments, the impedance matching unit includes a π-type impedance matching circuit, which is used to convert the power line side impedance to an operating impedance suitable for the band selection module. For example, the π-type impedance matching circuit can be used to convert an equivalent impedance varying from approximately 1Ω to 20Ω on the power line side into an operating impedance of approximately 50Ω suitable for the operation of the band selection module. It is readily understood that the above impedance range and operating impedance are merely examples and do not constitute a limitation on the scope of protection of this application.

[0058] In a field power line environment, the power line impedance is affected by load variations, line length, branch topology, and the type of connected equipment. If the power line impedance does not match the operating impedance of the frequency band selection module, the carrier communication signal may experience reflection and attenuation before entering the frequency band selection module. To address this, the impedance matching unit can employ a π-type impedance matching circuit, using passive components such as inductors and capacitors to transform the input impedance, converting the power line impedance to an impedance condition more suitable for the frequency band selection module's operation. This structure improves the transmission continuity between the end-side adapter module and the frequency band selection module, reducing signal loss caused by impedance mismatch.

[0059] like Figure 6As shown, a π-type impedance matching circuit can be configured between the input-side differential signal terminals SIG_P1 and SIG_N1 and the output-side differential signal terminals SIG_P2 and SIG_N2. Along the transmission direction of the carrier communication signal, high-frequency inductors are connected in series on the positive signal branch containing SIG_P1 and the negative signal branch containing SIG_N1, respectively, and a high-frequency capacitor is connected in parallel between the two signal branches, thus forming a π-type impedance transformation structure suitable for differential carrier communication signals. This structure allows for impedance transformation and shaping in the differential transmission path before the carrier communication signal enters the frequency band selection module from the power line side, thereby reducing the impact of power line side impedance fluctuations on the subsequent frequency band selection module.

[0060] exist Figure 6 In the example shown, a high-frequency isolation transformer T3 is also connected to the stage following the π-type impedance matching circuit. One winding of the high-frequency isolation transformer T3 is connected to the π-type impedance matching circuit, and the other winding is connected to the output differential signal terminals SIG_P2 and SIG_N2. After impedance matching is completed by the π-type impedance matching circuit, the carrier communication signal is transmitted in isolation through the high-frequency isolation transformer T3. In this way, the impedance matching circuit and the high-frequency isolation transformer work together to improve the impedance matching effect while reducing the impact of common-mode interference on the power line side, ground potential difference, or complex operating conditions on the subsequent frequency band selection module.

[0061] In some embodiments, the π-type impedance matching circuit includes a high-frequency inductor, a high-frequency capacitor, and a damping device, wherein the damping device is used to suppress resonant spikes in the π-type impedance matching circuit.

[0062] A π-type impedance matching circuit can consist of a high-frequency inductor and a high-frequency capacitor forming an impedance transformation network to adapt to the high-frequency operating range of the carrier communication signal. Since the combination of inductor and capacitor may resonate near a specific frequency, excessively high resonance peaks can lead to abnormal amplification of signals in local frequency bands, waveform distortion, or interference with the stable operation of the frequency band selection module. Therefore, damping devices, such as damping resistors, can be incorporated into the π-type impedance matching circuit to reduce the amplitude of resonance peaks, making the impedance matching process smoother. In this way, the impedance matching unit can both perform impedance transformation and reduce the risk of abnormal resonance introduced by the matching network itself.

[0063] It should be noted that, Figure 6 This diagram illustrates only one connection configuration for the π-type impedance matching circuit and the high-frequency isolation transformer, and does not limit the quantity, parameters, or specific connection locations of the high-frequency inductors, capacitors, or damping devices. In practical applications, the component parameters in the π-type impedance matching circuit can be configured according to the power line impedance variation range, the target carrier communication frequency band, and the operating impedance requirements of the frequency band selection module.

[0064] Because power line environments may contain lightning surges, transient spikes from switching operations, and impact interference caused by sudden load changes, if such interference directly enters the impedance matching unit, frequency band selection module, or other high-frequency transmission links, it may damage components or degrade the stability of the communication link. Therefore, a protection unit can be placed between the coupling unit and the impedance matching unit, positioning it upstream of the carrier communication signal entering the device. Specifically, in some embodiments, the first and second end-side adaptation modules also include a protection unit located between the coupling unit and the impedance matching unit. When surge interference or transient spike interference occurs on the power line, the protection unit can prioritize suppressing the impact energy, thereby reducing the transmission of high-energy interference to subsequent stages. This design improves the long-term reliability of the device in complex distribution areas, outdoor power distribution equipment, switchgear, and other similar scenarios.

[0065] like Figure 7 As shown, the first end-side adapter module 101 and the second end-side adapter module 103 may each include a protection unit. Specifically, the first end-side adapter module 101 includes a coupling unit 1011, a protection unit 1014, an impedance matching unit 1012, and a high-frequency isolation unit 1013 connected sequentially along the direction from the corresponding end power line into the frequency band selection module 102 of the carrier communication signal; the second end-side adapter module 103 includes a coupling unit 1031, a protection unit 1034, an impedance matching unit 1032, and a high-frequency isolation unit 1033 connected sequentially along the direction from the corresponding end power line into the frequency band selection module 102 of the carrier communication signal.

[0066] In some embodiments, the protection unit includes a gas discharge tube and / or a transient voltage suppressor tube. The gas discharge tube can withstand high-energy surge impacts, forming a discharge path when lightning overvoltages or large-amplitude surges occur, thereby reducing the voltage surge experienced by subsequent circuits. The transient voltage suppressor tube can clamp fast transient overvoltages, has a fast response speed, and is suitable for suppressing transient spikes caused by switching operations, etc. The protection unit can use only a gas discharge tube, only a transient voltage suppressor tube, or a multi-stage protection structure combining both. By coordinating different protection devices, both high-energy surge suppression and fast transient spike suppression can be achieved, improving the adaptability of the end-side adapter module to complex power line interference.

[0067] In some embodiments, the high-frequency isolation unit includes a high-frequency isolation transformer disposed between the impedance matching unit and the frequency band selection module. The high-frequency isolation transformer can be used to isolate the power line side and the frequency band selection module side while transmitting carrier communication signals. Specifically, the carrier communication signal, after being processed by the impedance matching unit, enters the high-frequency isolation transformer and is coupled to the frequency band selection module side. The high-frequency isolation transformer reduces the impact of common-mode interference on the power line side, ground potential difference, or other abnormal electrical conditions on the frequency band selection module, while maintaining the transmission capability of the target carrier communication frequency band signal. This structure can also cooperate with the impedance matching unit to enable the frequency band selection module to perform frequency band selection under relatively stable interface conditions.

[0068] In one example, a 1:1 high-frequency isolation transformer can be used to provide high-frequency isolation between the power line side and the frequency band selection module side while maintaining the carrier communication signal transmission relationship.

[0069] In some embodiments, the frequency band selection module includes a high-pass filter unit and a low-pass filter unit, which are cascaded to form a band-pass filter path. The band-pass filter path is used to configure the passband range according to the target carrier communication frequency band used by the carrier communication signal.

[0070] The frequency band selection module can form a bandpass filtering path through a combination of high-pass and low-pass filter units. The high-pass filter unit suppresses low-frequency components below the target carrier communication frequency band, such as power frequency correlated interference or low-frequency harmonics; the low-pass filter unit suppresses high-frequency noise or other out-of-band interference above the target carrier communication frequency band. When cascaded, the high-pass and low-pass filter units form a passband within their shared frequency range, allowing signals within the target carrier communication frequency band to pass through. In practical applications, the passband range can be configured according to the operating frequency band selected by the HPLC communication network, matching the frequency band selection module with the field carrier communication frequency band.

[0071] like Figure 8 As shown, the frequency band selection module can be implemented using a bandpass filter. This bandpass filter can include cascaded LC low-pass filter units and LC high-pass filter units. The LC low-pass filter unit can be used to limit the upper frequency limit of the target carrier communication band, suppressing out-of-band high-frequency interference above the target carrier communication band. The LC high-pass filter unit can be used to limit the lower frequency limit of the target carrier communication band, suppressing power frequency-related components, low-frequency harmonics, or other low-frequency interference below the target carrier communication band. Through the combination of the low-pass filter unit and the high-pass filter unit, the frequency band selection module can form a bandpass filter path that only allows signals within the target carrier communication band to pass through.

[0072] To ensure the flatness of the amplitude-frequency response within the passband, in some embodiments, the LC low-pass filter unit and the LC high-pass filter unit can employ a Butterworth filter structure. The Butterworth filter structure has a relatively flat amplitude-frequency response within the passband, which helps reduce the transmission amplitude differences of signals at different frequency points within the target carrier communication band, thereby ensuring that the HPLC carrier communication signal passes through the frequency band selection module with low attenuation and relatively even distribution within the target frequency band.

[0073] To improve out-of-band rejection capability, in some embodiments, the LC low-pass filter unit and / or LC high-pass filter unit may adopt a higher-order filter structure, such as a 9th-order or higher filter structure, to obtain a steeper transition band attenuation slope and reduce out-of-band noise and harmonics from entering the bypass transmission path.

[0074] Figure 8 An example of a bandpass filter adapted to the target carrier communication frequency band is shown. In this example, the input and output terminals of the bandpass filter are connected to an external port via transformers, and a multi-stage inductor and capacitor network is arranged in the differential signal path. The preceding inductor and capacitor network can constitute a low-pass filter section, and the subsequent capacitor and inductor network can constitute a high-pass filter section; the two are cascaded together to form a bandpass filter path. The inductor and capacitor parameters shown in the figure are only a reference example to illustrate one feasible structure of the bandpass filter and do not limit the specific order, number of components, or component parameters of the filter in this embodiment.

[0075] In practical applications, the passband cutoff frequency of the bandpass filter can be set according to the carrier communication frequency band used by the local HPLC communication network. By adjusting the inductor and capacitor parameters in the LC low-pass filter unit and LC high-pass filter unit, the bandpass filter path can be adapted to different carrier communication frequency bands. For example, in one scenario, the target carrier communication frequency band can be 2.4MHz to 5.6MHz; in another scenario, the target carrier communication frequency band can be 0.7MHz to 3MHz. Depending on the different communication frequency bands on site, different filter parameters can be selected so that the frequency band selection module can ensure that the carrier communication signal within the target frequency band passes through with low attenuation, while suppressing noise, harmonics, and other interference signals outside the target frequency band.

[0076] In this way, the frequency band selection module, as the core frequency band screening part of the power line carrier communication performance enhancement device, can select the frequency of the carrier communication signal entering the bypass transmission path after the end-side adapter module completes coupling, impedance matching, and high-frequency isolation. In this way, the device can not only provide a bypass transmission path for HPLC signals to bypass the target power equipment, but also prevent non-target frequency band interference from continuing to propagate along the bypass path, thereby improving the signal-to-noise ratio and transmission stability of the HPLC communication link.

[0077] like Figure 9 As shown, Figure 9 It shows Figure 8 The image shows a test result for a bandpass filter path. The horizontal axis represents frequency in MHz; the vertical axis represents transmission parameters, specifically the transmission coefficients in the S-parameters. Figure 9 The curve in the figure is used to characterize the attenuation of carrier communication signals when passing through a bandpass filter path at different frequencies.

[0078] Depend on Figure 9 As can be seen, within the target carrier communication frequency band, the curve approaches a low attenuation state, indicating that the bandpass filter path allows the carrier communication signal within the target carrier communication frequency band to pass through. In one example, the target carrier communication frequency band can correspond to frequency band 2, such as the HPLC carrier communication frequency band in the range of 0.7MHz to 3MHz. The transmission attenuation within this frequency band is relatively small, which is beneficial for the carrier communication signal to continue to be transmitted to the other end adapter module via the frequency band selection module.

[0079] Meanwhile, in the low-frequency range below the target carrier communication band, the curve shows a significant attenuation, indicating that the bandpass filter path can suppress power frequency related components, low-frequency harmonics, or other low-frequency interference from entering the bypass transmission path. In the high-frequency range above the target carrier communication band, the curve also gradually decreases, indicating that the bandpass filter path can suppress high-frequency noise or out-of-band interference outside the target carrier communication band. Therefore, the bandpass filter path can not only allow the carrier communication signal of band 2 to pass through, but also filter out out-of-band signal interference, improving the quality of the HPLC signal entering the subsequent link.

[0080] It should be noted that, Figure 9 The test results shown only correspond to an example of frequency response under one filter parameter configuration and do not limit the specific passband range of the frequency band selection module in this embodiment. If it is necessary to adapt to different carrier communication frequency bands, the parameters of devices such as inductors and capacitors in the high-pass filter unit and low-pass filter unit can be selected or adjusted according to the frequency band requirements adopted by the on-site HPLC communication network, so that the passband range of the bandpass filter path matches the actual carrier communication frequency band. Therefore, the frequency band selection module provided in this embodiment can adapt to the signal bypass transmission requirements under different HPLC communication frequency bands.

[0081] like Figure 10 As shown, Figure 10This paper illustrates a circuit-level implementation structure for a power line carrier communication performance enhancement device. The device employs a symmetrical passive hardware structure, with L1 and N1 terminals on one side and L2 and N2 terminals on the other side. L1 and N1 connect to the live and neutral wires at one end of the target power equipment, while L2 and N2 connect to the live and neutral wires at the other end. Internally, an HPLC signal path is formed between L1 and N1 and L2 and N2, allowing the HPLC carrier communication signal to bypass the target power equipment for transmission.

[0082] Specifically, Figure 10 The left-side capacitive coupling circuit, protection circuit, impedance matching circuit, and high-frequency transformer can constitute one circuit implementation of the first end-side adapter module; the right-side high-frequency transformer, impedance matching circuit, protection circuit, and capacitive coupling circuit can constitute one circuit implementation of the second end-side adapter module; the middle bandpass filter can constitute one circuit implementation of the frequency band selection module. In other words, in Figure 10 In the embodiment shown, the coupling unit can be implemented by a capacitive coupling circuit, the protection unit can be implemented by a protection circuit, the impedance matching unit can be implemented by an impedance matching circuit, the high-frequency isolation unit can be implemented by a high-frequency transformer, and the frequency band selection module can be implemented by a bandpass filter.

[0083] The capacitive coupling circuit couples the HPLC high-frequency carrier communication signal from the power line into the device, and utilizes the high impedance of capacitors to power frequency signals to suppress the 50Hz power frequency signal from entering the HPLC signal path. A protection circuit connected after the capacitive coupling circuit suppresses interference from lightning surges, transient spikes during switching operations, and other disturbances from entering subsequent circuits. An impedance matching circuit adapts the impedance on the power line side to the operating impedance on the bandpass filter side to reduce reflection loss during HPLC signal transmission within the device. A high-frequency transformer provides high-frequency isolation while transmitting the HPLC signal, reducing the impact of complex operating conditions on the power line side on the subsequent bandpass filter.

[0084] Figure 10 The bandpass filter in the middle section can include an LC low-pass filter and an LC high-pass filter. The combination of the LC low-pass and LC high-pass filters forms a bandpass path corresponding to the target HPLC communication frequency band, allowing the HPLC signal within the target carrier communication frequency band to pass through while suppressing low-frequency interference, high-frequency noise, and out-of-band harmonics outside the target carrier communication frequency band. By placing the bandpass filter between the two end-side adapter circuits, the HPLC signal can be frequency-selected after coupling, protection, impedance matching, and high-frequency isolation on one side, and then output to the power line at the other end of the target power equipment after high-frequency isolation, impedance matching, protection, and coupling on the other side.

[0085] exist Figure 10 In the illustrated embodiment, the HPLC signal enters the device from the L1 and N1 sides, passes through the left-side capacitive coupling circuit, protection circuit, impedance matching circuit, and high-frequency transformer to the bandpass filter, and then passes through the right-side high-frequency transformer, impedance matching circuit, protection circuit, and capacitive coupling circuit to be output to the L2 and N2 sides. Thus, Figure 10 The aforementioned modules and units are further implemented into specific passive circuit structures, enabling the power line carrier communication performance enhancement device to provide a low-attenuation, interference-resistant dedicated bypass transmission path for HPLC high-frequency carrier communication signals without changing the original primary wiring of the target power equipment, without affecting the transmission of 50Hz power frequency signals, and without damaging harmonic mitigation or switch protection functions.

[0086] In some embodiments, the target power equipment can be a harmonic mitigation device that significantly attenuates carrier communication signals, or a switching device that may cause a physical disconnection of the power line, to cover two common communication-constrained scenarios in complex power line environments. For harmonic mitigation devices, the device is primarily used to bypass their attenuation path for high-frequency carrier communication signals, allowing the carrier communication signals to avoid direct passage through the device itself. For switching devices, the device is primarily used to provide a bypass transmission path for carrier communication signals across both ends of the switching device when changes in the switching state obstruct the original power line transmission path.

[0087] In some embodiments, harmonic mitigation equipment includes reactors and / or isolation transformers, and switching equipment includes circuit breakers and / or disconnectors. Reactors, isolation transformers, and other harmonic mitigation equipment are typically used to suppress harmonics, isolate interference, or improve power quality, but they may exhibit significant attenuation of high-frequency carrier communication signals. Circuit breakers, disconnectors, and other switching equipment typically maintain the physical connection of the power line when closed, but disconnect it when open, thus interrupting carrier communication signals that rely on power line transmission.

[0088] like Figure 11 As shown, taking a reactor or isolation transformer as an example, without a power line carrier communication performance enhancement device, the reactor or isolation transformer can maintain the transmission of power frequency energy, but it will significantly attenuate the high-frequency carrier communication signal, causing a decrease in the amplitude of the high-frequency signal on its output side. After installing the power line carrier communication performance enhancement device, the device can be connected in parallel across the reactor or isolation transformer, allowing the high-frequency communication signal to pass normally through the bypass transmission path formed by the power line carrier communication performance enhancement device, while the power frequency power signal is still transmitted through the original power line and the reactor or isolation transformer. Therefore, the device can improve the attenuation effect of the reactor or isolation transformer on the HPLC signal without changing the original power frequency power transmission path.

[0089] like Figure 12 As shown, Figure 12 This diagram illustrates the signal transmission characteristics of the target power equipment combined with a power line carrier communication performance enhancement device. Without the power line carrier communication performance enhancement device, the target power equipment's transmission characteristics might exhibit the following: it maintains its original transmission or processing capabilities for power frequency or low-frequency components, while showing significant attenuation for the high-frequency carrier communication signals used by HPLC. With the power line carrier communication performance enhancement device installed, the combined equipment forms a relatively low-attenuation communication channel within the target carrier communication frequency band, allowing high-frequency communication signals to pass normally. Simultaneously, the device only opens the high-frequency band used for communication, without altering the target power equipment's original processing capabilities for power frequency power signals and low-frequency harmonic signals. Through this combined transmission characteristic, a reliable bypass channel can be provided for HPLC communication while preserving the original functions of the power equipment.

[0090] In some embodiments, when the target power equipment is a switchgear and the switchgear is in an open state, the bypass transmission path is used to allow the carrier communication signal to be transmitted across both ends of the switchgear.

[0091] When a switchgear is in the open state, the power lines at both ends are disconnected on the power frequency transmission path, and the original power line carrier communication path is also interrupted. At this time, the first-side adapter module can couple a carrier communication signal from one end of the power line of the switchgear. After being filtered by the frequency band selection module, the second-side adapter module couples the carrier communication signal to the other end of the power line of the switchgear. Thus, the carrier communication signal can be transmitted across both ends of the switchgear via a bypass transmission path. This method does not restore the power frequency conduction state of the switchgear, but rather provides a transmission path for high-frequency carrier communication signals while maintaining the switchgear's open function, thereby facilitating fault reporting, anomaly location, and remote maintenance information transmission.

[0092] like Figure 13 As shown, in environments with strong interference, power lines may be connected to strong interference sources such as power electronic devices, and interference suppression devices such as reactors may also be installed in the lines. In this case, a power line carrier communication performance enhancement device can be connected in parallel at both ends of the line section affected by strong interference sources or reactors. This allows the HPLC carrier communication signal to bypass the noisy signal interference sources or high-frequency attenuation points through a dedicated bypass transmission path. In this way, the HPLC carrier modules in the user's electricity meter can communicate through a more stable bypass path, reducing the impact of strong interference environments on the power line carrier communication network and improving communication success rate and stability.

[0093] like Figure 14As shown, in scenarios where it is used in conjunction with switchgear, the power line carrier communication performance enhancement device can be connected in parallel across both ends of the switchgear. When the switchgear is closed, the HPLC signal can be transmitted along the original power line; when the switchgear is open, the original physical path of the power line is cut off, and the bypass transmission path formed by the power line carrier communication performance enhancement device can continue to allow the HPLC signal to be transmitted across both ends of the switchgear. Therefore, this device can establish an HPLC communication channel independent of the current conduction state of the switchgear, achieving "bridging" of the communication link, so that signal transmission is not completely affected by the operating state of the switchgear, thereby improving the continuity of fault alarms, abnormal event location, and remote operation and maintenance services.

[0094] In some embodiments, when the target power equipment is a harmonic mitigation device, a bypass transmission path is used to allow carrier communication signals to bypass the harmonic mitigation device for transmission, and to enable the harmonic mitigation device to maintain its processing function for power frequency power signals and / or low-frequency harmonic signals.

[0095] When the target power equipment is a harmonic mitigation device such as a reactor or isolation transformer, the device remains within the original power line and continues to perform its original processing functions on power frequency signals or low-frequency harmonic signals. After the power line carrier communication performance enhancement device is connected in parallel across both ends of the harmonic mitigation device, the bypass transmission path is primarily used for carrier communication signal transmission, allowing the carrier communication signal to bypass the harmonic mitigation device itself, thereby reducing the attenuation of high-frequency carrier communication signals by the harmonic mitigation device. In this way, the power function of the harmonic mitigation device and the bypass transmission of the carrier communication signal can coexist, without disrupting the original power equipment function, while improving HPLC communication quality.

[0096] Furthermore, in this application mode, the power line carrier communication performance enhancement device primarily operates on the high-frequency band used by HPLC communication. It does not create a power frequency conduction alternative path for the 50Hz power frequency signal, nor does it alter the original processing methods of low-frequency harmonic signals or reactive components by harmonic mitigation equipment such as reactors and isolation transformers. Therefore, this device can serve as an auxiliary component of power harmonic mitigation equipment, focusing on HPLC signal penetration and low-attenuation transmission, improving the power line carrier communication performance in complex distribution areas without affecting the original functions of the power equipment.

[0097] In some embodiments, the power line carrier communication performance enhancement device is a passive device.

[0098] Power line carrier communication performance enhancement devices can be constructed from passive components, such as capacitors, inductors, resistors, transformers, gas discharge tubes, and transient voltage suppressors. Passive devices require no external power supply and do not need to demodulate, regenerate, or forward the carrier communication signal through software or chip logic. Instead, they rely on the circuit's inherent frequency selection, coupling, isolation, and impedance matching characteristics to form a bypass transmission path. Using a passive structure reduces on-site power supply and maintenance requirements, minimizes additional energy consumption, and facilitates long-term operation in scenarios such as switchgear, transformer substations, and outdoor distribution areas.

[0099] Because the device uses a passive hardware structure, it reduces active power consumption and requires no additional communication configuration or software debugging. Provided that on-site safety operating procedures are met, the device can also be installed in parallel, facilitating the upgrading of existing transformer substations and large-scale deployment in newly built substations, while reducing subsequent maintenance workload.

[0100] In some embodiments, the power line carrier communication performance enhancement device is used in single-phase power line carrier communication scenarios or three-phase power line carrier communication scenarios; wherein: in the single-phase power line carrier communication scenario, the first end-side adapter module is used to connect the live wire and neutral wire at one end of the target power equipment, and the second end-side adapter module is used to connect the live wire and neutral wire at the other end of the target power equipment; in the three-phase power line carrier communication scenario, each phase line is correspondingly provided with a first end-side adapter module, a frequency band selection module, and a second end-side adapter module.

[0101] In single-phase power line carrier communication scenarios, the target power equipment typically has live and neutral wire connection points at both ends. A first-side adapter module can connect to the live and neutral wires at one end of the target power equipment, and a second-side adapter module can connect to the live and neutral wires at the other end, thus forming a single-phase bypass transmission path between the two ends of the target power equipment. In three-phase power line carrier communication scenarios, a first-side adapter module, a frequency band selection module, and a second-side adapter module can be set for each phase line, enabling each phase line to have the corresponding carrier communication signal bypass transmission capability. Therefore, the device provided in this application embodiment can be flexibly deployed in single-phase or three-phase power line carrier communication networks according to the on-site power distribution configuration.

[0102] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the above-described embodiments. The above-described embodiments are merely illustrative and not restrictive. Under the guidance of this application, many other forms can be made without departing from the spirit and scope of the claims, and all of them are within the protection scope of this application.

[0103] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0104] Although embodiments of this application have been shown and described, it is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A power line carrier communication performance enhancement device, characterized in that, It includes a frequency band selection module, a first end-side adaptation module, and a second end-side adaptation module. The first end-side adaptation module and the second end-side adaptation module are respectively connected to both sides of the frequency band selection module and are symmetrically arranged with respect to the frequency band selection module; wherein: The first end-side adapter module is used to access the power line at one end of the target power equipment, couple the carrier communication signal from the power line at one end of the target power equipment, suppress the power frequency power signal from entering the power line carrier communication performance enhancement device, and adapt the power line side impedance to the working impedance of the frequency band selection module. The frequency band selection module is used to allow signals within the target carrier communication frequency band to pass through under the operating impedance, and to suppress signals outside the target carrier communication frequency band; The second end-side adapter module is used to connect to the power line at the other end of the target power equipment and couple the carrier communication signal processed by the frequency band selection module to the power line at the other end of the target power equipment. The first end-side adaptation module, the frequency band selection module, and the second end-side adaptation module together form a bypass transmission path for the carrier communication signal to bypass the target power equipment.

2. The power line carrier communication performance enhancement device according to claim 1, characterized in that, Both the first end-side adapter module and the second end-side adapter module include a coupling unit, an impedance matching unit, and a high-frequency isolation unit disposed between the corresponding end power line and the frequency band selection module; wherein, along the connection direction from the coupling unit to the frequency band selection module, the coupling unit, the impedance matching unit, and the high-frequency isolation unit are connected sequentially; wherein: The coupling unit is used to couple carrier communication signals and suppress the entry of power frequency power signals; The impedance matching unit is used to adapt the power line side impedance to the operating impedance of the frequency band selection module. The high-frequency isolation unit is used to isolate and transmit carrier communication signals.

3. The power line carrier communication performance enhancement device according to claim 2, characterized in that, The coupling unit includes a capacitive coupling circuit, which is connected in series in the transmission path of the carrier communication signal to allow the carrier communication signal to enter the power line carrier communication performance enhancement device and to block the power frequency power signal.

4. The power line carrier communication performance enhancement device according to claim 2, characterized in that, The impedance matching unit includes a π-type impedance matching circuit, which is used to convert the power line side impedance into an operating impedance suitable for the frequency band selection module.

5. The power line carrier communication performance enhancement device according to claim 4, characterized in that, The π-type impedance matching circuit includes a high-frequency inductor, a high-frequency capacitor, and a damping device, wherein the damping device is used to suppress resonance spikes in the π-type impedance matching circuit.

6. The power line carrier communication performance enhancement device according to claim 2, characterized in that, The first end-side adapter module and the second end-side adapter module further include a protection unit disposed between the coupling unit and the impedance matching unit, the protection unit being used to suppress surge interference and / or transient spike interference in the power line.

7. The power line carrier communication performance enhancement device according to claim 6, characterized in that, The protection unit includes a gas discharge tube and / or a transient voltage suppression tube.

8. The power line carrier communication performance enhancement device according to claim 2, characterized in that, The high-frequency isolation unit includes a high-frequency isolation transformer, which is disposed between the impedance matching unit and the frequency band selection module.

9. The power line carrier communication performance enhancement device according to claim 1, characterized in that, The frequency band selection module includes a high-pass filter unit and a low-pass filter unit, which are cascaded to form a band-pass filter path. The band-pass filter path is used to configure the passband range according to the target carrier communication frequency band used by the carrier communication signal.

10. The power line carrier communication performance enhancement device according to claim 1, characterized in that, The target power equipment includes harmonic mitigation equipment and / or switchgear.

11. The power line carrier communication performance enhancement device according to claim 10, characterized in that, The harmonic mitigation equipment includes reactors and / or isolation transformers, and the switching equipment includes circuit breakers and / or disconnect switches.

12. The power line carrier communication performance enhancement device according to claim 10, characterized in that, When the target power equipment is a switch-type device and the switch-type device is in an open state, the bypass transmission path is used to allow the carrier communication signal to be transmitted across both ends of the switch-type device.

13. The power line carrier communication performance enhancement device according to claim 10, characterized in that, When the target power equipment is a harmonic mitigation device, the bypass transmission path is used to allow the carrier communication signal to bypass the harmonic mitigation device for transmission, and to enable the harmonic mitigation device to maintain its processing function for power frequency power signals and / or low-frequency harmonic signals.

14. The power line carrier communication performance enhancement device according to claim 1, characterized in that, The power line carrier communication performance enhancement device is a passive device.

15. The power line carrier communication performance enhancement device according to claim 1, characterized in that, The power line carrier communication performance enhancement device is used in single-phase power line carrier communication scenarios or three-phase power line carrier communication scenarios; wherein: In the single-phase power line carrier communication scenario, the first end-side adapter module is used to connect the live wire and neutral wire at one end of the target power equipment, and the second end-side adapter module is used to connect the live wire and neutral wire at the other end of the target power equipment. In the three-phase power line carrier communication scenario, each phase line is equipped with a first end-side adaptation module, a frequency band selection module, and a second end-side adaptation module.

Images