CN116318267A

CN116318267A - Power line carrier communication system and harmonic suppression method system thereof

Info

Publication number: CN116318267A
Application number: CN202310559157.7A
Authority: CN
Inventors: 卢昭禹; 何凡; 付青琴; 付英春; 袁育博; 杨光伦; 王敏
Original assignee: Zhongguancun Xinhai Preferred Technology Co ltd
Current assignee: Zhongguancun Xinhai Preferred Technology Co ltd
Priority date: 2023-05-18
Filing date: 2023-05-18
Publication date: 2023-06-23
Anticipated expiration: 2043-05-18
Also published as: CN116318267B

Abstract

The application discloses a power line carrier communication system and a harmonic suppression method thereof, and relates to the technical field of carrier communication. The concentrator is capable of transmitting a harmonic suppression instruction to at least one power collector after determining that a first harmonic signal is present in the power line. The power harvester is capable of suppressing the first harmonic signal in response to the harmonic suppression instruction. And the concentrator can also inhibit the first harmonic signal after the plurality of power collectors cannot completely inhibit the first harmonic signal. Therefore, the concentrator and the electricity collector can perform double inhibition on the first harmonic signals, on one hand, the inhibition reliability on the first harmonic signals is improved, and therefore the higher communication quality of the power line carrier communication system is ensured, and on the other hand, the functions of the concentrator and the electricity meter are effectively enriched.

Description

Power line carrier communication system and harmonic suppression method system thereof

Technical Field

The present disclosure relates to the field of carrier communication technologies, and in particular, to a power line carrier communication system and a harmonic suppression method thereof.

Background

A power line carrier communication system generally includes: the concentrator and each power collector can transmit signals through a power line carrier communication (power line communication, PLC). The power line carrier communication can utilize the existing power grid as a signal transmission medium, and realize high-speed transmission of signals (such as analog signals or digital signals) in a carrier mode without re-erecting the network.

However, there are typically harmonics in the power grid (such as a switch connected to the power grid may generate harmonics during the high-speed on/off process, and the harmonics may enter the power grid), and the harmonics may cause the communication quality of the power line carrier communication system to be low.

Disclosure of Invention

The present application aims to solve, at least to some extent, one of the technical problems in the related art. To this end, the present application provides a power line carrier communication system and a harmonic suppression method thereof. The technical scheme is as follows:

in one aspect, a power line carrier communication system is provided, the system comprising: the power utilization system comprises a concentrator and a plurality of power utilization collectors, wherein the concentrator is in carrier communication with the plurality of power utilization collectors through a power line;

the concentrator is used for sampling the electrical parameters of the power line and sending a harmonic suppression instruction to at least one power utilization collector in the plurality of power utilization collectors under the condition that the first harmonic signal exists in the power line based on the sampled electrical parameters;

each power utilization collector is used for responding to the harmonic suppression instruction and suppressing the first harmonic signal;

the concentrator is further configured to, in a process of respectively suppressing the first harmonic signals by the plurality of power collectors, if it is determined that the first harmonic signals still exist in the power line, suppress the first harmonic signals.

Optionally, the concentrator includes: the device comprises a sampling circuit, a first control circuit and a first harmonic suppression circuit;

the first control circuit is respectively connected with the sampling circuit and the first harmonic suppression circuit;

the sampling circuit is used for sampling the electrical parameters of the power line and transmitting the sampled electrical parameters to the first control circuit;

the first control circuit is configured to send a harmonic suppression instruction to the plurality of power collectors when it is determined that a first harmonic signal exists in the power line based on the sampled electrical parameter, and control the first harmonic suppression circuit to be in a working state to suppress the first harmonic signal if it is determined that the first harmonic signal exists in the power line in a process that the plurality of power collectors respectively suppress the first harmonic signal.

Optionally, the first harmonic suppression circuit includes: a first harmonic rejection subcircuit and a second harmonic rejection subcircuit connected in parallel; the first control circuit is used for:

controlling the first harmonic suppression subcircuit to be in a working state;

and after the first harmonic suppression sub-circuit is in a working state, if the first harmonic signal is determined to exist in the power line, the second harmonic suppression sub-circuit is controlled to be in the working state.

Optionally, the first harmonic rejection subcircuit includes: a first switch and a first capacitor;

the control end of the first switch is connected with the first control circuit, the first end of the first switch is connected with the live wire of the power line, the second end of the first switch is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the zero line of the power line;

the first control circuit is used for: and controlling the first switch to be conducted so as to control the first harmonic suppression subcircuit to be in a working state.

Optionally, the second harmonic rejection subcircuit includes: the second switch, the third switch, the second capacitor and the first inductor;

the control end of the second switch and the control end of the third switch are respectively connected with the first control circuit, the first end of the second switch and the second end of the third switch are respectively connected with the first end of the first inductor, and the second end of the first inductor is connected with the live wire of the power line;

the second end of the second switch is connected with the first end of the second capacitor, and the first end of the third switch is respectively connected with the second end of the second capacitor and the zero line of the power line;

The first control circuit is used for: and controlling the second switch and the third switch to conduct complementarily so as to enable the second harmonic subcircuit to generate different matched impedances.

Optionally, the first harmonic suppression circuit further includes: a third harmonic rejection subcircuit, said third harmonic rejection subcircuit being in parallel with said first harmonic rejection subcircuit; the first control circuit is further configured to:

if the second harmonic signal exists in the power line, controlling the third harmonic suppression sub-circuit to be in a working state so as to suppress the second harmonic signal;

wherein the frequency of the second harmonic signal is equal to or greater than twice the frequency of the carrier signal transmitted in the power line.

Optionally, the third harmonic rejection subcircuit includes: the fourth switch, the second inductor and the third capacitor;

the control end of the fourth switch is connected with the first control circuit, the first end of the fourth switch is connected with the live wire of the power line, and the second end of the fourth switch is connected with the first end of the second inductor;

the second end of the second inductor is connected with the first end of the third capacitor, and the second end of the third capacitor is connected with a zero line of the power line;

The first control circuit is used for: and controlling the fourth switch to be conducted so as to enable the third harmonic suppression subcircuit to be in a working state.

Optionally, the number of the at least one electricity collector is a plurality of electricity collectors; the concentrator is used for:

determining a first electricity collector from the plurality of electricity collectors;

sending the harmonic suppression instruction to the first power collector;

and in the process of inhibiting the first harmonic signal by the first power collector, if the first harmonic signal is determined to exist in the power line, sending the harmonic inhibition instruction to a second power collector in the plurality of power collectors, wherein the second power collector is different from the first power collector.

Optionally, each electricity collector includes: a second control circuit and a second harmonic rejection circuit;

the second control circuit is connected with the second harmonic suppression circuit, and the second control circuit is used for: and responding to the harmonic suppression instruction, and controlling the second harmonic suppression circuit to be in a working state so as to suppress the first harmonic signal.

Optionally, the second harmonic suppression circuit includes: a plurality of fourth harmonic rejection subcircuits connected in parallel;

The second control circuit is used for responding to the harmonic suppression instruction and controlling at least one fourth harmonic suppression subcircuit to be in a working state.

Optionally, the number of the at least one fourth harmonic suppression subcircuit is R, where R is an integer greater than or equal to 1 and less than or equal to the total number of the plurality of parallel fourth harmonic suppression subcircuits, M fourth harmonic suppression subcircuits in the R fourth harmonic suppression subcircuits are in a working state, and M is an integer greater than or equal to 0 and less than or equal to the total number; the second control circuit is used for:

responding to the harmonic suppression instruction, and controlling T fourth harmonic suppression subcircuits to be in an operating state so as to enable the R fourth harmonic suppression subcircuits to be in an operating state;

wherein T is an integer greater than or equal to 1, and the sum of T and M is equal to R;

the length of the frequency interval of the first harmonic signals suppressed by the M+T fourth harmonic suppression sub-circuits is larger than the length of the frequency interval of the first harmonic signals suppressed by the M fourth harmonic suppression sub-circuits.

Optionally, each of the fourth harmonic rejection subcircuits includes: a fifth switch and a fourth capacitor;

The control end of the fifth switch is connected with the second control circuit, the first end of the fifth switch is connected with the live wire of the power line, and the second end of the fifth switch is connected with the first end of the fourth capacitor;

the second end of the fourth capacitor is connected with a zero line of the power line;

the second control circuit is used for responding to the harmonic suppression instruction and controlling the fifth switch of at least one fourth harmonic suppression sub-circuit to be conducted so as to control the at least one fourth harmonic suppression sub-circuit to be in a working state.

Optionally, the second harmonic suppression circuit further includes: a power consumption sub-circuit;

the power consumption sub-circuits are connected in parallel with each of the fourth harmonic suppression sub-circuits, and the power consumption sub-circuits are used for consuming power of a fourth capacitor in each of the fourth harmonic suppression sub-circuits.

Optionally, the power consuming subcircuit includes a resistor.

In another aspect, a method for harmonic suppression in a power line carrier communication system including a concentrator and a plurality of power collectors, the concentrator in carrier communication with the plurality of power collectors over a power line is provided, the method comprising:

Sampling an electrical parameter of the power line through the concentrator, and sending a harmonic suppression instruction to at least one power utilization collector of the plurality of power utilization collectors under the condition that a first harmonic signal exists in the power line based on the sampled electrical parameter, wherein the harmonic suppression instruction is used for instructing the at least one power utilization collector to suppress the first harmonic signal;

and in the process of respectively inhibiting the first harmonic signals by the plurality of power utilization collectors, if the first harmonic signals are determined to exist in the power line, the first harmonic signals are inhibited.

Optionally, the method further comprises:

in the process of respectively inhibiting the first harmonic signals by the plurality of power utilization collectors, if the second harmonic signals exist in the power line, inhibiting the second harmonic signals;

Optionally, the number of the at least one electricity collector is multiple; the sending a harmonic suppression instruction to at least one of the plurality of power utilization collectors includes:

sending the harmonic suppression instruction to the first power collector;

In yet another aspect, a computer readable storage medium is provided, on which a computer program is stored, which when executed by a processor, implements a method of harmonic suppression for a power line carrier communication system as described in the above aspects.

In yet another aspect, a computer program product is provided comprising instructions that, when run on the computer, cause the computer to perform the harmonic suppression method of the power line carrier communication system of the above aspect.

The beneficial effects that this application provided technical scheme brought include at least:

the utility model provides a power line carrier communication system and harmonic suppression method thereof, the concentrator can send harmonic suppression instruction to at least one electricity collector after confirming that there is first harmonic signal in the power line. The power harvester is capable of suppressing the first harmonic signal in response to the harmonic suppression instruction. And the concentrator can also inhibit the first harmonic signal after the plurality of power collectors cannot completely inhibit the first harmonic signal. Therefore, the concentrator and the electricity collector can perform double inhibition on the first harmonic signals, on one hand, the inhibition reliability on the first harmonic signals is improved, and therefore the higher communication quality of the power line carrier communication system is ensured, and on the other hand, the functions of the concentrator and the electricity meter are effectively enriched.

Additional aspects and advantages of the 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 the application.

Drawings

Fig. 1 is a schematic structural diagram of a power line carrier communication system according to an embodiment of the present application;

fig. 2 is a schematic diagram of a part of a power line carrier communication system according to an embodiment of the present application;

fig. 3 is a schematic diagram of a part of another power line carrier communication system according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a second harmonic suppression circuit according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of another second harmonic suppression circuit according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a first harmonic suppression circuit according to an embodiment of the present disclosure;

fig. 7 is a network topology diagram of a power line carrier communication system provided in an embodiment of the present application;

fig. 8 is a flowchart of a harmonic suppression method of a power line carrier communication system according to an embodiment of the present application;

fig. 9 is a flowchart of another harmonic suppression method of a power line carrier communication system according to an embodiment of the present application.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.

Fig. 1 is a schematic structural diagram of a power line carrier communication system according to an embodiment of the present application. As can be seen from fig. 1, the system may comprise: concentrator 100, a plurality of electricity collectors 200 (which may also be referred to as electricity meters). The concentrator 100 can be connected to each of the plurality of power utilization collectors 200 through a power line 300 and can be in carrier communication with each power utilization collector 200 through the power line 300.

In this embodiment of the present application, the concentrator 100 is capable of sampling an electrical parameter of the power line 300, and transmitting a harmonic suppression instruction to at least one power consumption collector 200 of the plurality of power consumption collectors 200 when it is determined that the first harmonic signal exists in the power line 300 based on the sampled electrical parameter. For example, the concentrator 100 may send a harmonic suppression instruction to the at least one power collector 200 by way of power line carrier communication.

Each power harvester 200 can be configured to reject the first harmonic signal in response to a harmonic rejection instruction sent by the concentrator 100. The concentrator 100 can also be used to suppress the first harmonic signal if it is determined that the first harmonic signal is still present in the power line 300 during the process of suppressing the first harmonic signal by the plurality of power collectors 200, respectively. That is, the concentrator 100 can automatically suppress the first harmonic signal if the plurality of power collectors 200 cannot completely suppress the first harmonic signal in the power line 300.

The power parameters of the power line 300 may include at least one of the following parameters: current, voltage and power. For example, the parameters may include: current and voltage. The frequency of the first harmonic signal is in the target frequency band, and the amplitude of the first harmonic signal is greater than or equal to the amplitude threshold and is not equal to the amplitude of the carrier signal transmitted in the power line 300.

The target frequency band, the amplitude threshold, and the amplitude of the carrier signal are all pre-stored by the concentrator 100. The amplitude threshold may be equal to one tenth of the amplitude of the carrier signal. The target frequency band may include a carrier frequency band of a carrier signal transmitted in the power line 300, and a difference obtained by subtracting an upper limit of the carrier frequency band from an upper limit of the target frequency band is smaller than a difference threshold, and a difference obtained by subtracting a lower limit of the target frequency band from a lower limit of the carrier frequency band is also smaller than the difference threshold. I.e. the frequency of the first harmonic signal is relatively close to the frequency of the carrier signal.

In summary, the embodiments of the present application provide a power line carrier communication system, where after determining that a first harmonic signal exists in a power line, a concentrator may send a harmonic suppression instruction to at least one power consumption collector. The power harvester is capable of suppressing the first harmonic signal in response to the harmonic suppression instruction. And the concentrator can also inhibit the first harmonic signal after the plurality of power collectors cannot completely inhibit the first harmonic signal. Therefore, the concentrator and the electricity collector can perform double inhibition on the first harmonic signals, on one hand, the inhibition reliability on the first harmonic signals is improved, and therefore the higher communication quality of the power line carrier communication system is ensured, and on the other hand, the functions of the concentrator and the electricity meter are effectively enriched.

With continued reference to fig. 1, the system may further include: a load 400 connected to each of the plurality of power utility collectors 200. The load 400 may include home appliances of a user such as a refrigerator, an air conditioner, a lamp, and the like. And the size of the load 400 may be constantly changing (i.e., the size has uncertainty) under the influence of user operation, resulting in variations in the harmonic signals in the power line 300. I.e. the harmonic signal is dynamically changing, not fixed.

Fig. 2 is a schematic structural diagram of a concentrator according to an embodiment of the present application. Referring to fig. 2, the concentrator 100 includes: a sampling circuit 101 and a first control circuit 102. The first control circuit 102 and the power line 300 are connected to the sampling circuit 101, respectively.

The sampling circuit 101 may be configured to sample an electrical parameter of the power line 300 and send the sampled electrical parameter to the first control circuit 102. The first control circuit 102 may be configured to send a harmonic suppression instruction to at least one power utility harvester 200 of the plurality of power utility harvesters 200 in the event that it is determined that a first harmonic signal is present in the power line 300 based on the sampled electrical parameter.

In the embodiment of the present application, after the concentrator 100 is started, the sampling circuit 101 may continuously sample the electrical parameter in the power line 300 according to the sampling period. The sampling period may be pre-stored by the concentrator 100. The first control circuit 102 may perform fourier transform (e.g., discrete fourier transform) on a plurality of consecutive electrical parameters sampled by the sampling circuit 101 to obtain frequencies and amplitudes of various harmonic signals present in the power line 300. The frequency and/or amplitude of any two harmonic signals are different.

Then, for each harmonic signal, if the first control circuit 102 determines that the frequency of the harmonic signal is in the target frequency band, the amplitude of the harmonic signal is greater than or equal to the amplitude threshold and less than the amplitude of the carrier signal, the harmonic signal may be determined to be the first harmonic signal, and then it may be determined that the first harmonic signal exists in the power line 300.

Alternatively, the first control circuit 102 may include: a control chip, and a minimum system circuit of the control chip. The minimum system circuit may include: a power supply circuit, a clock crystal oscillator circuit and the like.

The process of suppressing the first harmonic signal by the power consumption collector 200 will be described first in this embodiment:

referring to fig. 3, each electricity consumption collector 200 may include: a second control circuit 201 and a second harmonic suppression circuit 202, the second control circuit 201 being connected to the second harmonic suppression circuit 202. For each power harvester 200 that receives a harmonic suppression instruction, the second control circuit 201 of the power harvester 200 may be configured to control the second harmonic suppression circuit 202 to be in an operational state to suppress the first harmonic signal in response to the harmonic suppression instruction.

Fig. 4 is a schematic structural diagram of a second harmonic suppression circuit according to an embodiment of the present application. As can be seen from fig. 4, the second harmonic rejection circuit 202 may include: a plurality of fourth harmonic suppression sub-circuits 2021 in parallel, two fourth harmonic suppression sub-circuits 2021 being shown in fig. 4. The second control circuit 201 may be configured to: in response to the harmonic suppression instruction sent by the concentrator 100, at least one fourth harmonic suppression sub-circuit 2021 of the plurality of fourth harmonic suppression sub-circuits 2021 is controlled to be in an operating state to suppress the first harmonic signal in the power line 300.

In a first alternative example, the second control circuit 201 may be configured to control the plurality of parallel fourth harmonic suppression sub-circuits 2021 to be in an operating state in response to a harmonic suppression instruction sent by the concentrator 100 to suppress the first harmonic signal in the power line 300. That is, the second control circuit 201 may control the plurality of parallel fourth harmonic suppression sub-circuits 2021 to be simultaneously in operation.

In a second alternative example, the number of at least one parallel fourth harmonic rejection subcircuit 2021 is R. R is an integer equal to or greater than 1 and equal to or less than the total number of the plurality of parallel fourth harmonic suppression sub-circuits 2021. The M fourth harmonic suppression sub-circuits 2021 of the R fourth harmonic suppression sub-circuits 2021 are in operation. M is an integer of 0 or more and 0 or less than the total number. The second control circuit 201 may be configured to control the T fourth harmonic suppression sub-circuits 2021 to be in an active state in response to a harmonic suppression instruction sent by the concentrator 100, so that the R fourth harmonic suppression sub-circuits 2021 are in an active state. Wherein T is an integer greater than or equal to 1, and the sum of T and M is equal to R. For example, T is 1.

Since the harmonic signals in the power line 300 are dynamically changed, and the power consumption collector 200 can gradually increase the number of the fourth harmonic suppression subcircuits 2021 in an operating state in response to the harmonic suppression instruction, dynamic suppression of the first harmonic signals existing in the power line 300 can be achieved, so that high reliability and flexibility of suppression of the first harmonic signals can be ensured. In addition, the power consumption of the power consumption collector 200 can be reduced to a certain extent on the premise of suppressing the first harmonic signal.

For a second alternative example, the second control circuit 201 may detect whether the total number M of the fourth harmonic rejection sub-circuits 2021 currently in operation is smaller than the total number of the plurality of fourth harmonic rejection sub-circuits 2021 in response to the harmonic rejection instruction sent by the concentrator 100. If the second control circuit 201 determines that M is less than the total number, T fourth harmonic rejection sub-circuits 2021 may be controlled to be in operation. If the second control circuit 201 determines that M is equal to the total number, i.e., a plurality of parallel fourth harmonic rejection sub-circuits 2021 are all in operation, the plurality of fourth harmonic rejection sub-circuits 2021 may be kept in state.

The length of the frequency interval of the first harmonic signal suppressed by the m+t fourth harmonic suppression sub-circuits 2021 is longer than the length of the frequency interval of the first harmonic signal suppressed by the M fourth harmonic suppression sub-circuits 2021. That is, the larger the number of the fourth harmonic suppression subcircuits 2021 in the operating state is, the more harmonic signals of different frequencies can be suppressed. The length of the frequency interval is the difference obtained by subtracting the lower limit from the upper limit of the frequency interval.

For example, assume that the second harmonic suppression circuit 202 of each power harvester 200 includes 2 fourth harmonic suppression sub-circuits 2021, t is 1, and the number of fourth harmonic suppression sub-circuits 2021 currently in operation is 0. Since 0 is smaller than 2, which is the total number of the plurality of fourth harmonic suppression sub-circuits 2021, the electricity collector 200 may control 1 fourth harmonic suppression sub-circuit 2021 to be in an operating state after receiving the harmonic suppression instruction sent by the concentrator 100.

Assuming that the number of fourth harmonic suppression sub-circuits 2021 currently in operation is 2, since 2 is equal to the total number 2 of the plurality of fourth harmonic suppression sub-circuits 2021, the power consumption collector 200 may maintain the 2 fourth harmonic suppression sub-circuits 2021 in operation after the harmonic suppression command sent by the concentrator 100.

With continued reference to fig. 4, each fourth harmonic rejection subcircuit 2021 may include: a fifth switch 01 and a fourth capacitor 02. The control terminal of the fifth switch 01 is connected to the second control circuit 201, the first terminal of the fifth switch 01 is connected to the live line L of the power line 300, and the second terminal of the fifth switch 01 is connected to the first terminal of the fourth capacitor 02. The second terminal of the fourth capacitor 02 is connected to the neutral line N of the power line 300.

The second control circuit 201 is configured to control the fifth switch 01 of the at least one fourth harmonic suppression sub-circuit 2021 to be turned on in response to the harmonic suppression command, so as to control the at least one fourth harmonic suppression sub-circuit 2021 to be in an operating state.

Alternatively, the second control circuit 201 may output a control signal to the control terminal of the fifth switch 01 to control the fifth switch 01 to be turned on or off. The control signal may be a pulse-width modulation (PWM) signal.

In this embodiment of the present application, the load 400 is typically an inductive load, and after the fourth harmonic suppression sub-circuit 2021 is in a working state, capacitive compensation for the inductive load can be implemented, so that impedance matching between the load 400 and the power line 300 is implemented to a greater extent, thereby avoiding the generation of the first harmonic signal to a greater extent, and further implementing effective suppression of the first harmonic signal. And, the first electrical collector may capacitively compensate the inductive load by adding T fourth harmonic suppression subcircuits 2021 each time in response to the harmonic suppression instructions. Thereby, the flexibility of capacitive compensation of inductive loads is improved.

Alternatively, the fifth switch 01 may be a transistor. For example, the fifth switch 01 may be a field effect transistor.

Fig. 5 is a schematic structural diagram of another second harmonic suppression circuit according to an embodiment of the present application. As can be seen from fig. 5, the second harmonic suppression circuit 202 further comprises: the power consumption sub-circuit 2022. The power consumption sub-circuit 2022 is connected in parallel with each fourth harmonic suppression sub-circuit 2021. That is, one end of the power consumption sub-circuit 2022 may be connected to the line L of the power line 300, and the other end of the power consumption sub-circuit 2022 may be connected to the neutral line N of the power line 300.

The power consumption sub-circuit 2022 may be configured to consume power from the fourth capacitor 02 in each of the fourth harmonic suppression sub-circuits 2021, e.g., may consume power from the fourth capacitor 02 in the fourth harmonic suppression sub-circuit 2021 in an operating state.

Since the power consumption sub-circuit 2022 is provided, the power consumption sub-circuit 2022 can consume energy in the capacitor (i.e., the fourth capacitor 02 described above) in each fourth harmonic suppression sub-circuit 2021 when the capacitor is fully loaded, so that preparation for next harmonic suppression can be made, and protection of the second harmonic suppression circuit 202 can be achieved, ensuring normal operation of the second harmonic suppression circuit 202.

In an embodiment of the present application, with continued reference to fig. 5, the power consumption sub-circuit 2022 may include: and a resistor 03. The number of the resistors 03 may be one or more. For example, the number of the resistors 03 may be 1.

Alternatively, the number of the power consumption sub-circuits 2022 may be one or more. By way of example, as shown in fig. 5, the second harmonic rejection circuit 202 may include a power consumption sub-circuit 2022.

In the embodiment of the present application, the number of at least one electricity consumption collector 200 may be one or more, for example, may be multiple. In an alternative implementation, when the number of at least one electricity usage collector 200 is plural, after the concentrator 100 detects the presence of the first harmonic signal in the power line 300, a harmonic suppression instruction may be directly sent to each of all the electricity usage collectors 200 connected to the concentrator 100 through the power line 300. That is, at this time, the total number of at least one electricity usage harvester 200 is equal to the total number of the plurality of electricity usage harvesters 200.

In another alternative implementation, the process of the concentrator 100 sending harmonic suppression instructions to the at least one power harvester 200 may include: the concentrator 100 first determines a first electricity collector from the plurality of electricity collectors 200 and sends a harmonic suppression instruction to the first electricity collector. Then, in the process of the first power collector suppressing the first harmonic signal, if the concentrator 100 determines that the first harmonic signal is still present in the power line 300, a harmonic suppression instruction is sent to a second power collector of the plurality of power collectors, so as to instruct the second power collector to suppress the first harmonic signal. The second electricity collector is different from the first electricity collector.

Wherein, in the process of the first electrical collector suppressing the first harmonic signal, all the fourth harmonic suppression subcircuits 2021 of the first electrical collector are in an operating state.

It will be appreciated that each power harvester 200, upon determining that its plurality of fourth harmonic rejection sub-circuits 2021 are all in operation, may send a target signal to the concentrator 100 indicating that all of the fourth harmonic rejection sub-circuits 2021 are in operation. Accordingly, after receiving the target signal, the concentrator 100 may determine that all the fourth harmonic suppression sub-circuits 2021 of the power consumption harvester 200 are in operation. Based on this, if the concentrator 100 receives the target signal sent by the first electrical collector, it can be determined that all the fourth harmonic suppression sub-circuits 2021 of the first electrical collector are in an operating state.

Alternatively, the number of the first power collectors may be one or more, and the number may be inversely related to the amplitude of the carrier signal transmitted in the power line 300, and positively related to the total number of all the power collectors 200 and the amplitude of the first harmonic signal of the target frequency. The target frequency is a center frequency of a carrier band, for example, the target frequency is 2.5 megahertz (MHz).

Optionally, the target numberWThe following formula may be satisfied:

formula (1)

In formula (1), U is the total number of all the power collectors 200 connected to the concentrator 100, P is the amplitude of the first harmonic signal of the target frequency, and S is the amplitude of the carrier signal of the target frequency.

As can be seen from the above description, the concentrator 100 can determine the number of the first power collectors according to the amplitude of the first harmonic signal of the target frequency, the amplitude of the carrier signal of the target frequency, and the total number of all the power collectors 200, and send the harmonic suppression instruction to the first power collectors first, and then send the harmonic suppression instruction to the second power collectors after determining that the first harmonic signal still exists. In this way, the load 400 can be dynamically compensated, and accordingly, the first harmonic signal can be dynamically suppressed, so that effective suppression of the first harmonic signal in the power line 300 can be achieved.

Alternatively, the concentrator 100 may randomly determine at least one first electricity collector from the plurality of electricity collectors 200. Alternatively, the plurality of electricity collectors 200 may be arranged in sequence, and the concentrator 100 may have stored in advance an arrangement number of each of the plurality of electricity collectors 200 in the plurality of electricity collectors 200. The concentrator 100 determines at least one electricity collector 200 having consecutive serial numbers as the first electricity collector. For example, the concentrator 100 may determine the first at least one electricity collector 200 among the plurality of electricity collectors 200 arranged in sequence as the first electricity collector.

Optionally, the number of the second electricity collectors may be one or more. Each of the second electricity collectors is an electricity collector 200 other than the first electricity collector among the plurality of electricity collectors 200. If the number of the second power consumption collectors is 1, the concentrator 100 may directly send a harmonic suppression instruction to the second power consumption collectors. If the number of the second power consumption collectors is multiple, the process of sending the harmonic suppression instruction to the multiple second power consumption collectors by the concentrator 100 may refer to the process of sending the harmonic suppression instruction to at least one power consumption collector 100 in the multiple power consumption collectors 100 by the concentrator 100, which is not described herein in detail.

In this embodiment, for a scenario in which the first electrical collector controls the T fourth harmonic suppression subcircuits 2021 to be in a working state, after sending a harmonic suppression instruction to the first electrical collector, the concentrator 100 may further repeatedly execute the following steps until the first end condition is satisfied: detecting whether a first harmonic signal is also present in the power line 300; if it is determined that a first harmonic signal is also present in the power line 300, a harmonic suppression instruction is sent to at least one first electrical collector (e.g., one).

Wherein the first end condition may include: all of the fourth harmonic suppression subcircuits 2021 of each of the plurality of first electrical collectors are in operation, or there are no first harmonic signals in the power line 300.

Since the harmonic signals in the power line 300 may dynamically change, the plurality of power collectors 200 may not completely suppress the first harmonic signals in the power line 300, and thus the concentrator 100 may automatically suppress the first harmonic signals after the plurality of power collectors 200 cannot completely suppress the first harmonic signals. The process of suppressing the first harmonic signal by the concentrator 100 is described below:

with continued reference to fig. 2, the concentrator 100 may further include: the first harmonic rejection circuit 103. The first control circuit 102 may also be connected to a first harmonic rejection circuit 103, the first control circuit 102 may also be configured to: in the process of respectively suppressing the first harmonic signals by the plurality of power collectors 200, if it is determined that the first harmonic signals still exist in the power line 300, the first harmonic suppression circuit 103 is controlled to be in an operating state so as to suppress the first harmonic signals.

Fig. 6 is a schematic structural diagram of a first harmonic suppression circuit according to an embodiment of the present application. As can be seen from fig. 6, the first harmonic suppression circuit 103 may include: a first harmonic rejection subcircuit 1031 and a second harmonic rejection subcircuit 1032 connected in parallel. The first control circuit 102 may be configured to control the first harmonic suppression sub-circuit 1031 to be in an operating state when it is determined that the first harmonic signal is still present in the circuit line 300, and to control the second harmonic suppression sub-circuit 1032 to be in an operating state when it is detected that the first harmonic signal is still present in the power line 300 after the first harmonic suppression sub-circuit 1031 is in the operating state. In this way, dynamic suppression of the first harmonic signal is further achieved.

With continued reference to fig. 6, the first harmonic rejection subcircuit 1031 may include: a first switch 04 and a first capacitor 05. The control terminal of the first switch 04 is connected to the first control circuit 102, the first terminal of the first switch 04 is connected to the line L of the power line 300, and the second terminal of the first switch 04 is connected to the first terminal of the first capacitor 05. The second end of the first capacitor 05 is connected to the neutral line N of the power line 300. The first control circuit 102 may be configured to: the first switch 04 is controlled to be turned on to control the first harmonic suppression sub-circuit 1031 to be in an operating state.

It will be appreciated that the capacity of the first capacitor 05 may be determined in accordance with and positively correlated with the system capacity of the power line carrier communication system. The system capacity refers to: the capacity of the transformer in the zone where the concentrator is located. The second harmonic rejection after the sub-circuit 1031 is in operation, the first capacitor 05 is capable of matching the inductive reactance in the power line 300. In this way, on the one hand, the maximum output of the carrier wave transmitting power can be realized, the first harmonic signal is restrained to a certain extent, and on the other hand, the mutual inductance loss between the circuit line 300 and the building is smaller, so that the communication quality of the carrier wave communication can be ensured to be higher.

As shown in fig. 6, the second harmonic rejection subcircuit 1032 includes: a second switch 06, a third switch 07, a second capacitor 08 and a first inductance 09. The control terminal of the second switch 06 and the control terminal of the third switch 07 are connected to the first control circuit 102, respectively, and the first terminal of the second switch 06 and the second terminal of the third switch 07 are connected to the first terminal of the first inductor 09. The second end of the first inductor 09 is connected to the line L of the power line 300.

A second terminal of the second switch 06 is connected to a first terminal of the second capacitor 08, and a first terminal of the third switch 07 is connected to the second terminal of the second capacitor 08 and to the neutral line N of the power line 300, respectively. The first control circuit 102 may be configured to: the second switch 06 and the third switch 07 are controlled to be complementarily turned on so that the second harmonic subcircuit 1032 generates different matching impedances. In this way, the effect that the impedance of the concentrator 100 and the power line 300 is matched under different frequencies can be achieved, so that the first harmonic signals with different auxiliary frequencies in the power line 300 can flow into the zero line N of the power line 300, and the influence on carrier communication is reduced.

Wherein the auxiliary frequency may be less than 2MHz. Complementary conduction of the second switch 06 and the third switch 07 means: the second switch 06 is turned on, and the third switch 07 is turned off; the third switch 07 is turned on and the second switch 06 is turned off. That is, the second switch 06 and the third switch 07 cannot be simultaneously turned on, and the conductive states of the two switches are mutually exclusive. The on-time of the second switch 06 is longer than the on-time of the third switch 07.

It is understood that the capacity of the second capacitor 08 may be greater than the capacity of the first capacitor 05. The capacity of the second capacitor 08 can be determined according to and positively correlated with the frequency of the fundamental wave and the system capacity transmitted in the power line 300. The first control circuit 102 may refer to the second control circuit 201 for controlling the process of the first switch 04, the second switch 06 and the third switch 07, and the process of the fifth switch 01 is not described herein.

With continued reference to fig. 6, the first harmonic suppression circuit 103 further includes: a third harmonic rejection subcircuit 1033, the third harmonic rejection subcircuit 1033 being connected in parallel with the first harmonic rejection subcircuit 1031. The first control circuit 102 may also be connected to the third harmonic rejection subcircuit 1033, and the first control circuit 102 may be configured to: if it is determined that the second harmonic signal exists in the power line 300, the third harmonic suppression sub-circuit 1033 is controlled to be in an operating state to suppress the second harmonic signal. Wherein the frequency of the second harmonic signal is equal to or greater than twice the frequency of the carrier signal transmitted in the power line 300, for example, equal to twice the frequency of the carrier signal.

In this way, the second harmonic signal with high frequency can be prevented from occupying the channel of the carrier signal, so that the higher communication quality of the carrier communication can be ensured.

As can be seen in fig. 6, the third harmonic rejection subcircuit 1033 may include: a fourth switch 10, a second inductance 11 and a third capacitance 12. The control terminal of the fourth switch 10 is connected to the first control circuit 102, the first terminal of the fourth switch 10 is connected to the hot line L of the power line 300, and the second terminal of the fourth switch 10 is connected to the first terminal of the second inductor 11. The second end of the second inductor 11 is connected to the first end of the third capacitor 12, and the second end of the third capacitor 12 is connected to the neutral line N of the power line 300. The first control circuit 102 may be configured to: the fourth switch 10 is controlled to be turned on to put the third harmonic suppression sub-circuit 1033 into operation.

It is appreciated that the resonant frequency of the third harmonic rejection subcircuit 1033 may be equal to the frequency of the second harmonic signal. Accordingly, after the third harmonic suppression sub-circuit 1033 is in an operating state, the second harmonic signal can flow into the neutral line N of the power line 300 through the third harmonic suppression sub-circuit 1033. Thus, suppression of the second harmonic signal can be achieved.

As can be seen from the foregoing description, the concentrator 100 and the electricity collector 200 provided in the embodiments of the present application may each include a plurality of (may also be referred to as a multi-stage) harmonic suppression subcircuits, and in the process of suppressing harmonic signals, the harmonic suppression subcircuits may be gradually put into operation (i.e. the harmonic suppression subcircuits in an operating state may be gradually increased). In this way, harmonic signals present in the power line 300 under different load scenarios can be sufficiently suppressed. Therefore, the power line carrier communication system provided by the embodiment of the application can dynamically inhibit harmonic signals, so that higher communication quality of carrier communication is ensured.

In this embodiment of the present application, each electricity consumption collector 200 may be configured to collect electricity consumption information of a user, and may transmit the collected electricity consumption information to the concentrator 100 through a power line carrier communication manner, where the concentrator 100 may aggregate the electricity consumption information sent by a plurality of electricity consumption collectors 200. It can be seen that the system can be applied to the scene of electricity consumption information acquisition. In addition, each electricity collector 200 also has functions of automatic relay and forwarding.

As shown in fig. 2, the concentrator 100 may further include: the first carrier coupling circuit 104 may be connected to the first control circuit 102 and the power line 300, respectively, by the first carrier coupling circuit 104. The first carrier coupling circuit 104 may be used to couple the carrier signal modulated by the first control circuit 102 to the power line 300 and may be used to isolate high voltage power.

With continued reference to fig. 3, the electricity consumption collector 200 further includes: a second carrier coupling circuit 203. The second carrier coupling circuit 203 is connected to the second control circuit 201 and the power line 300, respectively, and the second carrier coupling circuit 203 can be used to couple the carrier signal modulated by the second control circuit 201 to the power line 300.

As can also be seen from fig. 3, the power line carrier communication system may further comprise: a power supply switch 500, one end of the power supply switch 500 is connected to the power line 300, and the other end of the power supply switch 500 is connected to the load 400. After the power switch 500 is closed, the power line 300 can supply power to the load 400.

Fig. 7 is a network topology diagram of a power line carrier communication system according to an embodiment of the present application. As can be seen from fig. 7, the communication network of the power line carrier communication system may be a tree network. The concentrator 100 is the root node of the tree network and each electricity collector 200 is a leaf node or child node of the tree network. The child node means: nodes connected to leaf nodes except root nodes.

The communication network may be divided into a layers according to the number of nodes through which the leaf nodes need to send data to the root node. Each layer comprises at least one node, and the data sent by the leaf node of the last layer to the root node can be transferred to the root node after a-1 times of forwarding.

In the embodiment of the present application, when the impedance of the load 400 and the impedance of the power line 300 are relatively matched, the output power of the power consumption collector 200 may be increased, and accordingly, the signal strength of the power consumption collector 200 may be increased. At this time, the concentrator 100 and the plurality of electricity collectors 200 provided in the embodiments of the present application may be re-networked. Correspondingly, the network topology diagram of the power line carrier communication system can be changed. Therefore, the networking flexibility of the power line carrier communication system provided by the embodiment of the application is higher.

The embodiment of the application provides a harmonic suppression method of a power line carrier communication system, which can be applied to the power line carrier communication system. As shown in fig. 1, the power line carrier communication system includes a concentrator 100 and a plurality of power collectors 200, and the concentrator 100 performs carrier communication with the plurality of power collectors 200 through a power line 300. Referring to fig. 8, the method includes:

step 301, the concentrator samples an electrical parameter of the power line, and sends a harmonic suppression instruction to at least one power utilization collector in the plurality of power utilization collectors when determining that a first harmonic signal exists in the power line based on the sampled electrical parameter.

Step 302, each of the at least one electricity collector responds to a harmonic suppression instruction sent by the concentrator to suppress the first harmonic signal.

In an embodiment of the present application, each electricity consumption collector may include: a second control circuit and a second harmonic rejection circuit. The second control circuit responds to the harmonic suppression instruction sent by the concentrator and can control the second harmonic suppression circuit to be in an operating state so as to suppress the first harmonic signal.

In step 303, in the process that the plurality of power collectors respectively inhibit the first harmonic signals, if it is determined that the first harmonic signals still exist in the power line, the concentrator inhibits the first harmonic signals.

Because the plurality of electricity collectors may not be able to completely suppress the first harmonic signal in the power line, the concentrator may further continuously detect whether the first harmonic signal exists in the power line during the process of respectively suppressing the first harmonic signal by the plurality of electricity collectors. If the concentrator determines that the first harmonic signal is also present in the power line, the first harmonic signal may be suppressed to sufficiently suppress the first harmonic signal in the power line.

In summary, the embodiments of the present application provide a harmonic suppression method for a power line carrier communication system, where after determining that a first harmonic signal exists in a power line, a concentrator may send a harmonic suppression instruction to at least one power collector. The power harvester is capable of suppressing the first harmonic signal in response to the harmonic suppression instruction. And the concentrator can also inhibit the first harmonic signal after the plurality of power collectors cannot completely inhibit the first harmonic signal. Therefore, the concentrator and the electricity collector can perform double inhibition on the first harmonic signals, on one hand, the inhibition reliability on the first harmonic signals is improved, and therefore the higher communication quality of the power line carrier communication system is ensured, and on the other hand, the functions of the concentrator and the electricity meter are effectively enriched.

Fig. 9 is a flowchart of another harmonic suppression method of a power line carrier communication system according to an embodiment of the present application, and the method may be applied to the power line carrier communication system. As shown in fig. 1, the power line carrier communication system includes a concentrator 100 and a plurality of power collectors 200, and the concentrator 100 performs carrier communication with the plurality of power collectors 200 through a power line 300. Referring to fig. 9, the method includes:

And step 401, the concentrator samples the electrical parameters of the power line, and sends a harmonic suppression instruction to at least one power utilization collector in the plurality of power utilization collectors when the first harmonic signal exists in the power line based on the sampled electrical parameters.

Optionally, the concentrator includes: the device comprises a sampling circuit, a first control circuit and a first harmonic suppression circuit. The first control circuit is connected with the sampling circuit and the first harmonic suppression circuit respectively. The sampling circuit may sample an electrical parameter of the power line and transmit the sampled electrical parameter to the first control circuit. The first control circuit may send a harmonic suppression instruction to the plurality of power collectors when it is determined that the first harmonic signal is present in the power line based on the sampled electrical parameter.

Optionally, the number of the at least one electricity collector is multiple. The process of the concentrator sending a harmonic suppression instruction to at least one of the plurality of power utility collectors may include: the concentrator determines a first electricity collector from the plurality of electricity collectors and sends a harmonic suppression instruction to the first electricity collector. And then, in the process of restraining the first harmonic signal by the first power collector, if the concentrator determines that the first harmonic signal still exists in the power line, sending a harmonic restraining instruction to a second power collector in the plurality of power collectors. The second electricity collector is different from the first electricity collector.

Step 402, each of the at least one power utilization collector responds to a harmonic suppression instruction sent by the concentrator to suppress a first harmonic signal.

Optionally, each electricity collector includes: the second control circuit is connected with the second harmonic suppression circuit. The second control circuit responds to the harmonic suppression instruction and can control the second harmonic suppression circuit to be in an operating state so as to suppress the first harmonic signal.

Optionally, the second harmonic suppression circuit includes: a plurality of fourth harmonic rejection subcircuits connected in parallel. The second control circuit may control the at least one fourth harmonic rejection subcircuit to be in an operational state in response to the harmonic rejection instruction.

Optionally, the number of the at least one fourth harmonic suppression sub-circuit is R, where R is an integer greater than or equal to 1 and less than or equal to the total number of the plurality of parallel fourth harmonic suppression sub-circuits, and M fourth harmonic suppression sub-circuits in the R fourth harmonic suppression sub-circuits are in an operating state, where M is an integer greater than or equal to 0 and less than or equal to the total number. The process of the second control circuit controlling the at least one fourth harmonic suppression sub-circuit to be in an operational state may include: and responding to the harmonic suppression instruction, and controlling the T fourth harmonic suppression sub-circuits to be in an operating state so as to enable the R fourth harmonic suppression sub-circuits to be in an operating state. Wherein T is an integer greater than or equal to 1, and the sum of T and M is equal to R. The length of the frequency interval of the first harmonic signals restrained by the M+T fourth harmonic restraining sub-circuits is larger than that of the frequency interval of the first harmonic signals restrained by the M fourth harmonic restraining sub-circuits.

In step 403, in the process that the plurality of power collectors respectively inhibit the first harmonic signals, if it is determined that the first harmonic signals still exist in the power line, the concentrator inhibits the first harmonic signals.

Optionally, in the process that the plurality of power collectors respectively inhibit the first harmonic signals, if it is determined that the first harmonic signals still exist in the power line, the first control circuit of the concentrator controls the first harmonic suppression circuit to be in a working state so as to suppress the first harmonic signals.

Optionally, the first harmonic suppression circuit includes: a first harmonic rejection subcircuit and a second harmonic rejection subcircuit in parallel. The process of controlling the first harmonic suppression circuit to be in an operating state by the first control circuit to suppress the first harmonic signal may include: and controlling the first harmonic suppression sub-circuit to be in a working state, and controlling the second harmonic suppression sub-circuit to be in a working state if the first harmonic signal is determined to exist in the power line after the first harmonic suppression sub-circuit is in the working state.

Step 404, if the concentrator determines that the second harmonic signal is still present in the power line, the concentrator suppresses the second harmonic signal.

Optionally, the first harmonic suppression circuit may further include: and the third harmonic suppression subcircuit is connected with the first harmonic suppression subcircuit in parallel. The first control circuit may also control the third harmonic suppression sub-circuit to be in an operating state to suppress the second harmonic signal if it is determined that the second harmonic signal is present in the power line. Wherein the frequency of the second harmonic signal is equal to or greater than twice the frequency of the carrier signal transmitted in the power line.

It will be appreciated that, for convenience and brevity of description, the specific working processes of the concentrator, the ammeter and the circuits described above may refer to the corresponding processes in the foregoing apparatus embodiments, which are not described herein again.

It can be further understood that the sequence of the steps of the harmonic suppression method of the power line carrier communication system provided by the embodiment of the application can be appropriately adjusted, and the steps can be correspondingly increased or decreased according to the situation. For example, step 404 may also be performed before step 403; alternatively, step 404 may be deleted as appropriate. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered in the protection scope of the present application, and thus will not be repeated.

The present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the harmonic suppression method of a power line carrier communication system as provided in the above method embodiment.

The present application also provides a computer program product containing instructions, which when executed on a computer, cause the computer to perform the harmonic suppression method of the power line carrier communication system provided by the above method embodiment.

It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "examples," "particular examples," "alternative," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. A power line carrier communication system, the system comprising: the power utilization system comprises a concentrator and a plurality of power utilization collectors, wherein the concentrator is in carrier communication with the plurality of power utilization collectors through a power line;

2. The system of claim 1, wherein the concentrator comprises: the device comprises a sampling circuit, a first control circuit and a first harmonic suppression circuit;

3. The system of claim 2, wherein the first harmonic rejection circuit comprises: a first harmonic rejection subcircuit and a second harmonic rejection subcircuit connected in parallel; the first control circuit is used for:

controlling the first harmonic suppression subcircuit to be in a working state;

4. The system of claim 3, wherein the first harmonic rejection subcircuit comprises: a first switch and a first capacitor;

5. The system of claim 3, wherein the second harmonic rejection subcircuit comprises: the second switch, the third switch, the second capacitor and the first inductor;

6. The system of claim 3, wherein the first harmonic rejection circuit further comprises: a third harmonic rejection subcircuit, said third harmonic rejection subcircuit being in parallel with said first harmonic rejection subcircuit; the first control circuit is further configured to:

7. The system of claim 6, wherein the third harmonic rejection subcircuit comprises: the fourth switch, the second inductor and the third capacitor;

8. The system according to any one of claims 1 to 7, wherein the at least one electricity collector is a plurality of electricity collectors; the concentrator is used for:

sending the harmonic suppression instruction to the first power collector;

9. The system of claim 8, wherein each of the power collectors comprises: a second control circuit and a second harmonic rejection circuit;

10. The system of claim 9, wherein the second harmonic rejection circuit comprises: a plurality of fourth harmonic rejection subcircuits connected in parallel;

11. The system of claim 10, wherein the number of at least one of the fourth harmonic suppression subcircuits is R, R is an integer greater than or equal to 1 and less than or equal to the total number of the plurality of parallel fourth harmonic suppression subcircuits, M of the R fourth harmonic suppression subcircuits are in operation, M is an integer greater than or equal to 0 and less than or equal to the total number; the second control circuit is used for:

12. The system of claim 10, wherein each of the fourth harmonic rejection subcircuits comprises: a fifth switch and a fourth capacitor;

13. The system of claim 10, wherein the second harmonic rejection circuit further comprises: a power consumption sub-circuit;

14. The system of claim 13, wherein the power consumption sub-circuit comprises a resistor.

15. A method of harmonic suppression in a power line carrier communication system, the power line carrier communication system comprising a concentrator and a plurality of power collectors, the concentrator in carrier communication with the plurality of power collectors over a power line, the method comprising:

16. The method of claim 15, wherein the method further comprises:

17. The method according to claim 15 or 16, wherein the at least one electricity collector is a plurality of electricity collectors; the sending a harmonic suppression instruction to at least one of the plurality of power utilization collectors includes:

sending the harmonic suppression instruction to the first power collector;

18. A computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the harmonic suppression method of a power line carrier communication system as claimed in any one of claims 15 to 17.