Efficient transmission method of multi-band carrier signals in low-voltage power grid

Abstract

The present invention relates to the field of signal transmission technology, and in particular to a method for efficiently transmitting a multi-band carrier signal in a low-voltage power grid, comprising: determining the type of carrier signal transmitted by the low-voltage power grid, and periodically acquiring load information of the power grid; analyzing the load information of the low-voltage power grid, determining the sub-time period for carrier signal transmission within a detection period, and load variation parameters; determining the transmission type of the sub-time period according to the variation parameters combined with the load information; determining the transmission priority of each type of signal according to the signal type, and determining the signal transmission mode according to the transmission type combined with the transmission priority of each type of signal; detecting the transmission parameters of the low-voltage power grid, and determining the compensation mode and the corresponding compensation amount of each transmission mode according to each transmission parameter; determining the carrier signal transmission abnormality and issuing an early warning when the carrier signal of the control instruction type cannot be transmitted normally. The present invention improves the transmission efficiency and accuracy of the signal, and ensures the efficient and stable operation of power grid communication at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of signal transmission, and in particular to a method for efficiently transmitting multi-band carrier signals in a low-voltage power grid. Background Art

[0002] The existing technology for transmitting multi-band carrier signals in low-voltage power grids mainly involves using power lines as transmission media, communicating by encoding current signals and superimposing them on the industrial frequency current signals of power lines. This method can sample current in the power supply circuit, obtain sampled current signals, and convert them into corresponding voltage signals, thereby extracting energy change characteristics corresponding to the communication data to be transmitted, and finally restoring the communication data to be transmitted by analyzing these characteristics. The application of this technology includes but is not limited to remote meter reading systems and remote control of equipment in smart grids, which can realize real-time collection and statistics of user electricity consumption data and transmission of remote switch commands, thereby realizing remote monitoring and control of equipment in fields such as smart homes and industrial automation.

[0003] Chinese patent application publication number: CN115314078A, discloses a carrier signal superposition communication method, device, medium and equipment based on power line transmission, the method includes: obtaining an encoded current signal of a set range frequency; superimposing the encoded current signal on the power frequency current signal of the power line for transmission; sampling the current of the power supply circuit of the power line to obtain a sampled current signal; converting the sampled current signal into a corresponding encoded voltage signal; extracting the energy corresponding to the communication data to be transmitted; according to the energy change characteristics corresponding to the communication data to be transmitted, by analyzing, the communication data to be transmitted is obtained. The device, medium and equipment can be used to implement the method; it can be seen that the carrier signal superposition communication method, device, medium and equipment based on power line transmission have the following problems: it does not take into account that the increase of power grid load will cause line impedance changes, affect signal attenuation and delay, increase transmission errors, and during peak load periods, the noise level of the power grid rises, further interfering with the carrier signal, reducing the signal-to-noise ratio of the signal, resulting in a waste of transmission resources or affecting the accuracy of signal transmission. Summary of the invention

[0004] To this end, the present invention provides a method for efficiently transmitting a multi-band carrier signal in a low-voltage power grid, so as to overcome the problem in the prior art that an increase in the power grid load does not take into account that the line impedance will change, affecting the attenuation and delay of the signal, and increasing the transmission error, as well as the problem that during peak load periods, the noise level of the power grid rises, further interfering with the carrier signal, reducing the signal-to-noise ratio of the signal, resulting in a waste of transmission resources or affecting the accuracy of signal transmission.

[0005] To achieve the above object, the present invention provides a method for efficiently transmitting a multi-band carrier signal in a low-voltage power grid, comprising:

[0006] Determine the type of carrier signal transmitted by the low-voltage power grid, and periodically obtain load information of the low-voltage power grid;

[0007] Analyze the load information of the low-voltage power grid, determine the carrier signal transmission sub-time period within the detection period, and determine the change parameters of each low-voltage power grid load change, the change parameters including the change mode and the change amount;

[0008] Determine the transmission type of the signal transmission sub-time period according to the change parameter of the load change of each of the low-voltage power grids in combination with the load information, the transmission type including a stable transmission time period, a fluctuating transmission time period and an allowed transmission time period;

[0009] Determine the transmission priority of each type of signal according to the signal type of the carrier signal, and determine the transmission mode of each signal type according to the transmission type of the signal output sub-time period combined with the transmission priority of each type of signal, the signal type of the carrier signal includes the data type, the control instruction type and the voice type;

[0010] Detecting transmission parameters of the low-voltage power grid, and determining compensation methods and corresponding compensation amounts of various transmission methods according to the transmission parameters, wherein the transmission parameters include temperature information and a signal-to-noise ratio of the low-voltage power grid;

[0011] When the carrier signal of the control instruction type cannot be transmitted normally, it is determined that the carrier signal transmission is abnormal and an early warning is issued.

[0012] Further, determining the carrier signal transmission sub-time period within the detection period includes:

[0013] Determine the principle load of the low-voltage power grid and each load peak value in the load information of the low-voltage power grid;

[0014] Compare each of the load peaks with the principle load, and select a load peak that is lower than the principle load;

[0015] Determine the allowed transmission duration of the carrier signal according to the load peak value of the load in the principle;

[0016] The shortest transmission time length is set, and the carrier signal transmission sub-time period is selected according to the shortest transmission time length.

[0017] Further, determining the transmission type of the signal transmission sub-time period according to the change parameter of the load change of each of the low-voltage power grids in combination with the load information includes:

[0018] If the load information of the low-voltage power grid meets the carrier stable transmission condition, the transmission type of the signal transmission sub-time period is a stable transmission time period;

[0019] If the load information of the low-voltage power grid does not meet the carrier stable transmission condition, determining the transmission type of the signal transmission sub-time period according to the load change of the low-voltage power grid;

[0020] The carrier stable transmission condition is that the load of the low-voltage power grid does not exceed the transmission stable load.

[0021] Further, determining the transmission type of the signal transmission sub-time period according to the load change of the low-voltage power grid includes:

[0022] If the load change of the low-voltage power grid meets the transmission law change condition, the transmission type of the signal transmission sub-time period is a fluctuating transmission time period;

[0023] If the load change of the low-voltage power grid does not meet the transmission rule change condition, the transmission type of the signal transmission sub-time period is an allowed transmission time period;

[0024] The transmission rule change condition is that the change mode is volatile and a single change amount is less than a change threshold.

[0025] Further, the transmission priority of each type of signal is determined according to the signal type of the carrier signal, including:

[0026] The signal type is the data type, and its transmission priority is the transmission high priority;

[0027] The signal type is a control instruction type, and its transmission priority is a transmission secondary priority;

[0028] The signal type is voice type, and its transmission priority is the lowest transmission priority.

[0029] Furthermore, the transmission mode of each signal type is determined according to the transmission type of the signal output sub-period combined with the transmission priority of each type of signal, including:

[0030] If the transmission type of the signal transmission sub-time period is a stable transmission time period, the types of signals to be transmitted are determined according to the transmission priorities of various types of signals, including voice signals, data signals, and control command signals;

[0031] If the transmission type of the signal transmission sub-time period is a fluctuating transmission time period or an allowed transmission time period, the transmission type is determined according to the transmission priority of each type of signal, including a data signal and a control instruction signal.

[0032] Furthermore, determining the transmission mode of each signal type also includes determining the number of occupied channels according to the number of transmission types and corresponding priorities.

[0033] Furthermore, the compensation method of each transmission mode is determined according to each transmission parameter of the low-voltage power grid, including:

[0034] Obtain temperature information and signal-to-noise ratio of the low-voltage power grid;

[0035] If each of the transmission parameters meets the corresponding compensation condition, increasing the signal strength;

[0036] The compensation condition is that the temperature information is greater than a preset temperature, or the actual signal-to-noise ratio is less than a preset signal-to-noise ratio.

[0037] Further, the compensation amount is determined according to corresponding transmission parameters that meet corresponding compensation conditions;

[0038] The compensation amount is positively correlated with the temperature information, and negatively correlated with the signal-to-noise ratio.

[0039] Furthermore, whether the carrier signal of the control instruction type is transmitted normally is determined according to the number of channels used by the carrier signal of the control instruction type.

[0040] Compared with the prior art, the beneficial effect of the present invention is that the present invention detects the load changes of the low-voltage power grid, divides the transmission time into stable, fluctuating and allowed transmission time periods, and optimizes the signal transmission mode in combination with the transmission priority of the signal type. When the power grid load is stable, all types of signals are transmitted first to ensure the quality of voice communication and data transmission efficiency; when the power grid load fluctuates, the adjustment strategy mainly transmits data and control command signals to adapt to the dynamic changes of the power grid load; when the load changes greatly, key signals are selectively transmitted to ensure the reliability of signal transmission and the overall efficiency of power grid communication. In addition, the channel analysis tool is used to select the best channel, and the number of channels required is estimated according to the signal type and transmission amount, and the channel resources are flexibly adjusted to maximize the channel utilization. The present invention optimizes the allocation of communication resources, improves the transmission efficiency and accuracy of various types of signals, and also enhances the intelligence and automation level of the entire power grid, ensuring the efficient and stable operation of power grid communication.

[0041] Furthermore, in the present invention, by intelligently identifying the load changes of the power grid, the transmission time is divided into stable, fluctuating and allowed transmission time periods, thereby optimizing the transmission efficiency and stability of voice, data and command signals. Various signals can be transmitted when the load is stable, and the transmission strategy is adjusted to adapt to the changes when the load fluctuates, while selective transmission is performed when the load changes greatly, thereby ensuring the reliability of signal transmission and the overall efficiency of power grid communication.

[0042] Furthermore, in the present invention, the transmission priority of various types of signals can ensure the reasonable allocation of network resources. Data signals have the highest priority because they contain key real-time monitoring and control information, ensuring that key information such as power data, load information and equipment status can be transmitted quickly, so as to make decisions and responses in time. Control command signals are of secondary priority, ensuring that system operations and control commands such as starting and stopping equipment and adjusting loads are executed at appropriate times to maintain the smooth operation of the system. Transmitting different types of carrier signals according to priority not only optimizes the allocation of communication resources and ensures the efficiency and accuracy of various types of transmission, but also improves the intelligence and automation level of the entire power grid.

[0043] Furthermore, in the present invention, the transmission time is divided into stable, fluctuating and allowed transmission time periods according to the change of the power grid load, and the transmission of voice signals, data signals and control command signals is optimized in combination with the transmission priority of the signal. In the stable transmission time period, voice signals are allowed to be transmitted and their communication quality can be guaranteed. In the fluctuating or allowed transmission time period, the main focus is on the transmission of data and control command signals to adapt to the dynamic changes of the power grid load. In addition, by using the channel analysis tool to select the best channel and estimating the number of channels required according to the signal type and transmission amount, the channel resources can be flexibly adjusted to give priority to the transmission of key signals, while maximizing the channel utilization rate to ensure the efficient and stable operation of the overall communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a flow chart of a method for efficiently transmitting a multi-band carrier signal in a low-voltage power grid according to an embodiment of the present invention;

[0045] Figure 2 This is a flow chart of the carrier signal transmission sub-time period within the detection cycle according to an embodiment of the present invention;

[0046] Figure 3 A logic diagram for determining a transmission type of a signal transmission sub-time period according to an embodiment of the present invention;

[0047] Figure 4 A logic diagram for determining the transmission mode of each signal type according to an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0050] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0051] See also Figure 1 As shown, it is a flow chart of a method for efficiently transmitting a multi-band carrier signal in a low-voltage power grid according to an embodiment of the present invention; the present invention provides a method for efficiently transmitting a multi-band carrier signal in a low-voltage power grid, comprising:

[0052] Step S1, determining the type of carrier signal transmitted by the low-voltage power grid, and periodically acquiring load information of the low-voltage power grid;

[0053] Step S2, analyzing the load information of the low-voltage power grid, determining the carrier signal transmission sub-time period within the detection period, and determining the change parameters of each low-voltage power grid load change, the change parameters including the change mode and the change amount;

[0054] Step S3, determining the transmission type of the signal transmission sub-time period according to the change parameter of the load change of each of the low-voltage power grids combined with the load information, the transmission type including a stable transmission time period, a fluctuating transmission time period and an allowed transmission time period;

[0055] Step S4, determining the transmission priority of each type of signal according to the signal type of the carrier signal, and determining the transmission mode of each signal type according to the transmission type of the signal output sub-period combined with the transmission priority of each type of signal, the signal type of the carrier signal includes a data type, a control instruction type, and a voice type;

[0056] Step S5, detecting the transmission parameters of the low-voltage power grid, and determining the compensation method and the corresponding compensation amount of each transmission method according to each transmission parameter, wherein the transmission parameters include temperature information and a signal-to-noise ratio of the low-voltage power grid;

[0057] Step S6: When the carrier signal of the control instruction type cannot be transmitted normally, it is determined that the carrier signal transmission is abnormal and an early warning is issued.

[0058] In implementation, the detection cycle is 1 day, and the acquisition cycle for obtaining low-voltage power grid load information is 5 minutes.

[0059] According to the transmission type of each time period determined in the current detection cycle, the transmission type of each time period in the next detection cycle is predicted, and the model type and transmission mode of the corresponding transmitted carrier signal are predicted.

[0060] The present invention detects the load changes of the low-voltage power grid, divides the transmission time into stable, fluctuating and allowed transmission time periods, and optimizes the signal transmission mode in combination with the transmission priority of the signal type. When the power grid load is stable, all types of signals are transmitted preferentially to ensure the quality of voice communication and data transmission efficiency; when the power grid load fluctuates, the adjustment strategy mainly transmits data and control command signals to adapt to the dynamic changes of the power grid load; when the load changes greatly, key signals are selectively transmitted to ensure the reliability of signal transmission and the overall efficiency of power grid communication. In addition, the channel analysis tool is used to select the best channel, and the number of channels required is estimated according to the signal type and transmission amount, and the channel resources are flexibly adjusted to maximize the channel utilization. The present invention optimizes the allocation of communication resources, improves the transmission efficiency and accuracy of various types of signals, and also enhances the intelligence and automation level of the entire power grid, ensuring the efficient and stable operation of power grid communication.

[0061] See also Figure 2 As shown, it is a flowchart of the carrier signal transmission sub-time period within the detection cycle according to an embodiment of the present invention, and determining the carrier signal transmission sub-time period within the detection cycle includes:

[0062] Determine the principle load of the low-voltage power grid and each load peak value in the load information of the low-voltage power grid;

[0063] Compare each of the load peaks with the principle load, and select a load peak that is lower than the principle load;

[0064] Determine the allowed transmission duration of the carrier signal according to the load peak value of the load in the principle;

[0065] The shortest transmission time length is set, and the carrier signal transmission sub-time period is selected according to the shortest transmission time length.

[0066] In practice, the principle load of the power grid is determined according to the rated values ​​of the transformers, switches, transmission lines and other equipment in the power grid. The principle load of each equipment is usually clearly specified in its technical specifications. In addition, the power system is designed according to the N-1 principle, that is, when any single component (such as line, generator, transformer, etc.) fails, the system can still maintain stable operation and normal power supply, other components do not exceed the load, and the voltage and frequency are within the allowable range. Therefore, in practice, there will be a short period of time when the power load exceeds the principle load (at this time it is less than the rated load of the power grid);

[0067] The shortest transmission time is 30 minutes. It is understandable that when transmitting a carrier signal containing a voice signal in a low-voltage power grid, in order to ensure the quality of voice communication, it is necessary to ensure that the working parameters of the power grid (such as voltage, frequency, load, etc.) remain stable within a certain period of time. The carrier system that transmits voice signals generally requires the working parameters to remain stable throughout the voice call, usually for a few minutes to even hours, depending on the actual duration of the call. In order to ensure the quality of the call, the parameters of the power grid should be kept from fluctuating as much as possible during each call. In addition, voice signals have high requirements for transmission quality, especially real-time communication, which is sensitive to delays and packet loss rates.

[0068] Therefore, during the transmission of voice signals, the working parameters of the power grid must be kept stable within a certain period of time. The power grid parameters are mainly affected by its load. During a day, the power grid load will change significantly in certain periods, such as the peak power consumption period on weekdays, the morning peak: usually between 7 and 9 in the morning, many people start to go to work and school, and the family's electricity demand increases, resulting in an increase in load; or the evening peak: usually between 6 and 10 in the evening, during this time people will use electrical appliances after returning home, resulting in increased power consumption.

[0069] In this embodiment, the carrier signal allows transmission duration time that the load peak is less than the time corresponding to the principle load; the carrier signal transmission sub-time period is selected according to the shortest transmission time length, and the carrier signal allows transmission duration time length greater than the shortest transmission time length.

[0070] See also Figure 3 As shown, it is a logic diagram for determining the transmission type of the signal transmission sub-time period according to an embodiment of the present invention. The transmission type of the signal transmission sub-time period is determined according to the change parameters of the load change of each low-voltage power grid combined with the load information, including:

[0071] If the load information of the low-voltage power grid meets the carrier stable transmission condition, the transmission type of the signal transmission sub-time period is a stable transmission time period;

[0072] If the load information of the low-voltage power grid does not meet the carrier stable transmission condition, determining the transmission type of the signal transmission sub-time period according to the load change of the low-voltage power grid;

[0073] The carrier stable transmission condition is that the load of the low-voltage power grid does not exceed the transmission stable load.

[0074] In implementation, the transmission stable load is determined according to the historical records, and various types of carrier signals can stably transmit the corresponding maximum value of the low-voltage power grid load.

[0075] Specifically, determining the transmission type of the signal transmission sub-time period according to the load change of the low-voltage power grid includes:

[0076] If the load change of the low-voltage power grid meets the transmission law change condition, the transmission type of the signal transmission sub-time period is a fluctuating transmission time period;

[0077] If the load change of the low-voltage power grid does not meet the transmission rule change condition, the transmission type of the signal transmission sub-time period is an allowed transmission time period;

[0078] The transmission rule change condition is that the change mode is volatile and a single change amount is less than a change threshold.

[0079] In implementation, the change mode is load increase or decrease, and the change mode has volatility that the difference of the load corresponding to the starting time point in the current time period does not exceed 0.1 to 0.2 times the load at the start time of the current time period, and there is no load increase or decrease in three or more consecutive acquisition cycles;

[0080] The change threshold is 0.4 to 0.5 times the load difference between the principle load and the transmission stable load.

[0081] In the present invention, by intelligently identifying the load changes of the power grid, the transmission time is divided into stable, fluctuating and allowed transmission time periods, thereby optimizing the transmission efficiency and stability of voice, data and command signals. Various signals can be transmitted when the load is stable, and the transmission strategy is adjusted to adapt to the changes when the load fluctuates. When the load changes greatly, selective transmission is performed, thereby ensuring the reliability of signal transmission and the overall efficiency of power grid communication.

[0082] See also Figure 4 As shown, it is a logic diagram of determining the transmission mode of each signal type according to an embodiment of the present invention. The transmission priority of each type of signal is determined according to the signal type of the carrier signal, including:

[0083] The signal type is the data type, and its transmission priority is the transmission high priority;

[0084] The signal type is a control instruction type, and its transmission priority is a transmission secondary priority;

[0085] The signal type is voice type, and its transmission priority is the lowest transmission priority.

[0086] In practice, the carrier signals transmitted in the low-voltage power grid mainly include voice signals, data signals and control command signals. For data signals and control command signals, these two signals are usually the main part of signal transmission in the low-voltage power grid, and data signals are one of the most common transmission contents in low-voltage power line carrier communications. These data may include user electricity consumption data, equipment status information, etc. For example, in remote meter reading systems, power line carrier communications are widely used to transmit user electricity consumption data to the power company's data center to achieve real-time collection and statistics of electricity consumption data. Control instructions are another common power line carrier signal transmission content. These instructions can be used to remotely control the switching of equipment, adjust the operating parameters of equipment, etc. For example, in smart grids, power line carrier communications can be used to transmit remote switch-on and switch-off instructions to achieve remote control of power grid equipment.

[0087] In addition, in the fields of smart home and industrial automation, power carrier communication is also used to transmit device status information and control instructions to achieve remote monitoring and control of equipment.

[0088] It can be understood that data type signals include key real-time monitoring and control information, such as power data, load information, equipment status, etc. This information is crucial to the operation and management of the power system. In actual transmission, high priority ensures that this data can be transmitted quickly so that timely decisions and responses can be made; control command signals are usually used for system operation and control, such as starting and stopping equipment, adjusting loads, etc. These commands usually need to be transmitted at the appropriate time to ensure the smooth operation of the system; voice type signals are usually used for internal communications. Although important, their direct impact on the operation of the power grid is relatively small, and when the network load is high, voice signals can be delayed or paused when necessary to ensure the timely transmission of high priority and sub-priority signals, which helps to maintain the stability of the power system at critical moments.

[0089] In the present invention, the transmission priority of various types of signals can ensure the reasonable allocation of network resources. Data signals have the highest priority because they contain key real-time monitoring and control information, ensuring that key information such as power data, load information and equipment status can be transmitted quickly, so as to make decisions and responses in time. Control command signals are of secondary priority, ensuring that system operations and control commands such as starting and stopping equipment and adjusting loads are executed at appropriate times to maintain the smooth operation of the system. Transmitting different types of carrier signals according to priority not only optimizes the allocation of communication resources and ensures the efficiency and accuracy of various types of transmission, but also improves the intelligence and automation level of the entire power grid.

[0090] Specifically, the transmission mode of each signal type is determined according to the transmission type of the signal output sub-period combined with the transmission priority of each type of signal, including:

[0091] If the transmission type of the signal transmission sub-time period is a stable transmission time period, the types of signals to be transmitted are determined according to the transmission priorities of various types of signals, including voice signals, data signals, and control command signals;

[0092] If the transmission type of the signal transmission sub-time period is a fluctuating transmission time period or an allowed transmission time period, the transmission type is determined according to the transmission priority of each type of signal, including a data signal and a control instruction signal.

[0093] In implementation, a channel analysis tool (such as the WiFi Analyzer APP) is used to monitor and analyze the channel usage in the surrounding environment. Based on the analysis results, channels that do not overlap or have less interference are selected and recorded as available channels.

[0094] Specifically, determining the transmission mode of each signal type further includes determining the number of occupied channels according to the number of transmission types and corresponding priorities.

[0095] In implementation, through channel bonding technology, multiple channels can be combined into a wider channel to increase the data transmission rate. Therefore, the basic number of channels to be used is determined by the number of available channels detected and the priority of signals of each transmission type.

[0096] According to the signal type and the corresponding transmission amount, the required number of channels is preliminarily estimated. The estimation method is a prior art and will not be described in detail here.

[0097] In this embodiment, the number of channels used by the data type is determined first, and then the number of channels used by the control instruction type is determined, and the remaining available channels are available channels for voice type signals.

[0098] In the present invention, the transmission time is divided into stable, fluctuating and allowed transmission time periods according to the change of power grid load, and the transmission of voice signals, data signals and control command signals is optimized in combination with the transmission priority of the signal. In the stable transmission time period, voice signals are allowed to be transmitted and their communication quality can be guaranteed. In the fluctuating or allowed transmission time period, the main focus is on the transmission of data and control command signals to adapt to the dynamic changes of power grid load. In addition, by using channel analysis tools to select the best channel and estimating the number of channels required according to the signal type and transmission volume, channel resources can be flexibly adjusted to give priority to the transmission of key signals, while maximizing channel utilization to ensure efficient and stable operation of the overall communication system.

[0099] Specifically, the compensation methods for each transmission mode are determined according to the transmission parameters of the low-voltage power grid, including:

[0100] Obtain temperature information and signal-to-noise ratio of the low-voltage power grid;

[0101] If each of the transmission parameters meets the corresponding compensation condition, increasing the signal strength;

[0102] The compensation condition is that the temperature information is greater than a preset temperature, or the actual signal-to-noise ratio is less than a preset signal-to-noise ratio.

[0103] In implementation, the temperature information is the cable temperature, a spectrum analyzer is used to obtain the signal-to-noise ratio, and the cable temperature is obtained through a temperature sensor. This is a prior art and is not specifically limited.

[0104] The preset temperature is 60°C and the preset signal-to-noise ratio is 20dB.

[0105] Specifically, the compensation amount is determined according to corresponding transmission parameters that meet corresponding compensation conditions;

[0106] The compensation amount is positively correlated with the temperature information, and negatively correlated with the signal-to-noise ratio.

[0107] In implementation, the signal to be amplified is input into the amplifier, and the gain of the amplifier is set as required. After being processed by the amplifier, the amplitude of the output signal will be larger than that of the input signal.

[0108] Gain is the compensation amount. If the compensation condition is triggered by the temperature information being greater than the preset temperature, the temperature difference, ∆T, is calculated. The compensation amount G1=∆T / T×G0, where T is the preset temperature and G0 is the original signal strength in dBm.

[0109] If the compensation condition is triggered when the actual signal-to-noise ratio is less than the preset signal-to-noise ratio, the compensation amount G2 = (∆SNR / SNR0) × G0, where ∆SNR is the signal-to-noise ratio difference, SNR0 is the preset signal-to-noise ratio, and G0 is the original signal strength in dBm.

[0110] Specifically, whether the carrier signal of the control instruction type is transmitted normally is determined according to the number of channels used by the carrier signal of the control instruction type.

[0111] In implementation, if the number of channels used by the carrier signal of the control instruction type is less than the expected number, it is determined that the carrier signal of the control instruction type cannot be transmitted normally.

[0112] If the efficient transmission method of multi-band carrier signals in the low-voltage power grid of the present invention is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0113] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for efficiently transmitting a multi-band carrier signal in a low-voltage power grid, characterized in that: include: Determine the type of carrier signal transmitted by the low-voltage power grid, and periodically obtain load information of the low-voltage power grid; Analyze the load information of the low-voltage power grid, determine the carrier signal transmission sub-time period within the detection period, and determine the change parameters of each low-voltage power grid load change, the change parameters including the change mode and the change amount; Determine the transmission type of the signal transmission sub-time period according to the change parameter of the load change of each of the low-voltage power grids in combination with the load information, the transmission type including a stable transmission time period, a fluctuating transmission time period and an allowed transmission time period; Determine the transmission priority of each type of signal according to the signal type of the carrier signal, and determine the transmission mode of each signal type according to the transmission type of the signal output sub-time period combined with the transmission priority of each type of signal, the signal type of the carrier signal includes the data type, the control instruction type and the voice type; Detecting transmission parameters of the low-voltage power grid, and determining compensation methods and corresponding compensation amounts of various transmission methods according to the transmission parameters, wherein the transmission parameters include temperature information and a signal-to-noise ratio of the low-voltage power grid; When the carrier signal of the control instruction type cannot be transmitted normally, it is determined that the carrier signal transmission is abnormal and an early warning is issued; Determining the carrier signal transmission sub-time period within the detection period includes: Determine the principle load of the low-voltage power grid and each load peak value in the load information of the low-voltage power grid; Compare each of the load peaks with the principle load, and select a load peak that is lower than the principle load; Determine the allowed transmission duration of the carrier signal according to the load peak value of the load in the principle; The shortest transmission time length is set, and the carrier signal transmission sub-time period is selected according to the shortest transmission time length.

2. The method for efficiently transmitting a multi-band carrier signal in a low-voltage power grid according to claim 1, characterized in that: Determining the transmission type of the signal transmission sub-time period according to the change parameter of the load change of each of the low-voltage power grids in combination with the load information includes: If the load information of the low-voltage power grid meets the carrier stable transmission condition, the transmission type of the signal transmission sub-time period is a stable transmission time period; If the load information of the low-voltage power grid does not meet the carrier stable transmission condition, determining the transmission type of the signal transmission sub-time period according to the load change of the low-voltage power grid; The carrier stable transmission condition is that the load of the low-voltage power grid does not exceed the transmission stable load.

3. The method for efficiently transmitting a multi-band carrier signal in a low-voltage power grid according to claim 2, characterized in that: Determining the transmission type of the signal transmission sub-time period according to the load change of the low-voltage power grid includes: If the load change of the low-voltage power grid meets the transmission law change condition, the transmission type of the signal transmission sub-time period is a fluctuating transmission time period; If the load change of the low-voltage power grid does not meet the transmission rule change condition, the transmission type of the signal transmission sub-time period is an allowed transmission time period; The transmission rule change condition is that the change mode is volatile and a single change amount is less than a change threshold.

4. The method for efficiently transmitting a multi-band carrier signal in a low-voltage power grid according to claim 3, characterized in that: The transmission priority of various signals is determined according to the signal type of the carrier signal, including: The signal type is the data type, and its transmission priority is the transmission high priority; The signal type is a control instruction type, and its transmission priority is a transmission secondary priority; The signal type is voice type, and its transmission priority is the lowest transmission priority.

5. The method for efficiently transmitting multi-band carrier signals in a low-voltage power grid according to claim 4, characterized in that: Determine the transmission mode of each signal type according to the transmission type of the signal output sub-period combined with the transmission priority of each signal, including: If the transmission type of the signal transmission sub-time period is a stable transmission time period, the types of signals to be transmitted are determined according to the transmission priorities of various types of signals, including voice signals, data signals, and control command signals; If the transmission type of the signal transmission sub-time period is a fluctuating transmission time period or an allowed transmission time period, the transmission type is determined according to the transmission priority of each type of signal, including a data signal and a control instruction signal.

6. The method for efficiently transmitting multi-band carrier signals in a low-voltage power grid according to claim 5, characterized in that: Determining the transmission mode of each signal type also includes determining the number of occupied channels according to the number of transmission types and corresponding priorities.

7. The method for efficiently transmitting multi-band carrier signals in a low-voltage power grid according to claim 6, characterized in that: The compensation methods for each transmission mode are determined according to the transmission parameters of the low-voltage power grid, including: Obtain temperature information and signal-to-noise ratio of the low-voltage power grid; If each of the transmission parameters meets the corresponding compensation condition, increasing the signal strength; The compensation condition is that the temperature information is greater than a preset temperature, or the actual signal-to-noise ratio is less than a preset signal-to-noise ratio.

8. The method for efficiently transmitting multi-band carrier signals in a low-voltage power grid according to claim 7, characterized in that: The compensation amount is determined according to corresponding transmission parameters that meet corresponding compensation conditions; The compensation amount is positively correlated with the temperature information, and negatively correlated with the signal-to-noise ratio.

9. The method for efficiently transmitting multi-band carrier signals in a low-voltage power grid according to claim 8, characterized in that: Whether the carrier signal of the control instruction type is transmitted normally is determined according to the number of channels used by the carrier signal of the control instruction type.

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