CN115144654A

CN115144654A - Phase recognition method, phase recognition device, communication system, and storage medium

Info

Publication number: CN115144654A
Application number: CN202210742289.9A
Authority: CN
Inventors: 冦相海; 邓敬贤; 胡剑锋; 张国松
Original assignee: Core Semiconductor Technology Beijing Co ltd
Current assignee: Core Semiconductor Technology Beijing Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-10-04

Abstract

The embodiment of the invention discloses a phase identification method, a phase identification device, a communication system and a storage medium, wherein zero-crossing network reference time NTB information of one or more local phases is acquired and recorded as first zero-crossing network reference time NTB information; acquiring zero-crossing network reference time NTB information of a communication node to be identified, and recording the information as second zero-crossing network reference time NTB information; selecting only one zero-crossing network reference time NTB of any phase in the first zero-crossing network reference time NTB information as a reference origin; selecting only one zero-crossing network reference time NTB in the second zero-crossing network reference time NTB information as a comparison point; calculating the offset of the comparison point relative to the reference origin point in one power cycle; and determining the phase of the communication node to be identified according to the offset. Therefore, the calculation is simple, and the identification is high-speed and accurate.

Description

Phase recognition method, phase recognition device, communication system, and storage medium

Technical Field

The present invention relates to the field of power line communication technologies, and in particular, to a phase identification method, a phase identification device, a phase identification communication system, and a storage medium.

Background

The Power Line Communication (PLC) technology, defined in GB/T31983.31, refers to: the information data is modulated to a proper carrier frequency, and data transmission is carried out by taking a power line as a physical medium, so that communication or control between data terminals is realized. The power line is the most popular physical medium with the widest coverage range, the power line is used for transmitting data information, great convenience is achieved, and all electric equipment connected with the power line can form a communication network without rewiring to carry out information interaction and communication. The method is simple to implement and convenient to maintain, can effectively reduce the operation cost and reduce the expenditure for constructing a new communication network, and therefore, the method becomes a main communication means for application of smart grids, energy management, smart homes, photovoltaic power generation, electric vehicle charging and the like.

From different angles, power line communication can be classified as follows:

1. from the power line application range, there can be divided into communication systems utilizing high/medium voltage distribution networks and communication systems generally utilizing only medium/low voltage distribution networks. The former is mainly applied to a communication system (which can provide long-distance communication, such as a power carrier system) in a power system, and the latter is mainly applied to an access system of communication services of public users.

2. From the range of communication service applications, this classification method is generally applied to communication systems using medium/low voltage distribution networks, which are classified into narrowband communication applications and broadband communication applications. The narrow-band communication application mainly utilizes a frequency band of 3kHz to 500kHz, and typical low-voltage narrow-band power line communication application situations include centralized meter reading (AMR) of an intelligent electric energy meter, AMI/AMM (advanced measurement system/automatic meter reading), household intelligent control, street lamp control, intelligent buildings, four-meter centralized meter reading and other applications of an intelligent power Grid (Smart Grid), such as: electric vehicle charging control, and the like. Broadband communication applications are accesses that can be implemented to provide public users with integrated services such as data, voice, images, and the like. Broadband PLC as applied distribution network voltage the classes can be divided into low voltage PLC and medium voltage PLC. The low-voltage PLC uses a low-voltage (220V/380V) power line as a transmission medium, and provides applications such as Internet access, a home local area network, remote meter reading, intelligent home furnishing and the like for users. The medium voltage PLC uses a medium voltage (10 kV) power line as a communication link, and provides a transmission channel for accessing a backbone network, automation of a power distribution network, user demand side management, rural telephones and other applications.

The narrow-band PLC system usually does not open communication services to public users, and mainly collects, monitors and transmits data of the power system. In contrast, the broadband PLC is widely applied to the field of public communication at present, and national standard GB/T33854 power line networking requirements for broadband client network networking based on public telecommunication network stipulates a broadband PLC system based on HomePlug AV technology.

With the popularization of power line communication technology and the wide use of electronic electric energy meters in charging systems, the proportion of meter reading systems adopting a power line carrier communication mode is increasing. The power line carrier communication meter reading system generally includes: a master station, a concentrator and a communication node. The concentrator is a central management device and a control device of a remote centralized meter reading system, is responsible for regularly reading data of the communication nodes, and has the functions of command transmission, data communication, network management, event recording, transverse data transmission and the like of the system. The power line carrier communication meter reading system takes a low-voltage PLC network as a main communication channel, and takes common communication channels such as GPRS, GSM, CDMA and the like and partial RS485 bus channels as auxiliary communication channels. The main line of low pressure PLC network generally adopts three-phase four-wire system power supply, and ordinary resident user's power consumption only takes one of them looks as live wire (L), takes the ground wire as zero line (N), and some mills can use three-phase electricity because production needs, consequently, most communication nodes are single-phase electric energy meter in the power line carrier communication system of checking meter, and the minority is three-phase electric energy meter. For low-voltage PLC communication, on one hand, because a signal transmission path is lengthened and noise is increased when communication nodes perform cross-phase communication, in the low-voltage PLC communication, in-phase communication nodes should be selected as much as possible to perform relay communication when routing is performed, so as to reduce interference and ensure communication quality. On the other hand, in order to improve the distribution transformation utilization rate, the master station needs to move some users with heavier loads to another lighter phase for loading, so as to realize load balance of each phase, because if the three-phase load of the power supply line is unbalanced, the power supply efficiency of the line and the distribution transformer is reduced if the load is light, and serious consequences such as the burning of a certain phase lead, the burning of a switch, even the single-phase burning of the distribution transformer and the like can be caused if the heavy-load phase is overloaded too much. For the reasons, it is very important to accurately judge the phases of the electric consumers and know the distribution of the electric meters of the electric consumers on the phase lines.

At present, a plurality of methods for phase identification in a power line communication meter reading system exist, and one method is to transmit an identification signal to a user electric meter through an intelligent terminal, and the user electric meter identifies the phase information of the user electric meter in a mode of determining the phase information of the user electric meter based on the identification signal and feeding the phase information back to the intelligent terminal. However, this method has problems that: when the distance between the intelligent terminal and the user electric meter is long, attenuation of the identification signal may be caused due to the long distance, so that phase information identification of the user electric meter is failed; in another method, the phases are determined by using the phases A, B and C of the transformer area general table as reference, and performing correlation operation on the voltage values of the user electric energy meter at several times and the voltage values of the transformer area general table at the same corresponding time respectively, and selecting the voltage value with the highest correlation. The method has the disadvantages that the correlation between the user electric energy meter voltage sequence data and the voltage sequence data of each phase of the transformer area general tables A, B and C is measured by adopting the Pearson correlation coefficient, the requirement on data quality is high, the accuracy is poor (the two sequences are required to be linearly correlated, have equal length and normally distributed), and the calculation amount is large.

Based on the above, it is desirable to provide a phase identification method, device, communication system and storage medium based on a low voltage power line broadband communication network, which are simple in calculation and accurate in identification, so as to overcome the limitations and drawbacks in the prior art.

Disclosure of Invention

In view of this, embodiments of the present invention provide a phase identification method, an apparatus, a communication system, and a storage medium, in which a phase of a communication node can be accurately identified only through two zero-crossing NTB information, and compared with other methods in the prior art, the method has the characteristics of simple calculation and high-speed and accurate identification.

In a first aspect, an embodiment of the present invention provides a phase identification method, applied to a master node of a low-voltage power line broadband communication network, including at least:

acquiring zero-crossing network reference time NTB information of one or more local phases, and recording the information as first zero-crossing network reference time NTB information;

acquiring zero-crossing network reference time NTB information of a communication node to be identified, and recording the information as second zero-crossing network reference time NTB information;

selecting only one zero-crossing network reference time NTB of any phase in the first zero-crossing network reference time NTB information as a reference origin; selecting only one zero-crossing network reference time NTB in the second zero-crossing network reference time NTB information as a comparison point;

calculating the offset of the comparison point relative to the reference origin point in one power cycle;

and determining the phase of the communication node to be identified according to the offset.

Preferably, the offset of the comparison point with respect to the reference origin in one power cycle is calculated by the following formula:

NtbOffset＝(NtbSta–NtbCco)Mod NtbPowerPeriod；

the network reference time value corresponding to one power cycle is NtbPowerPeriod, the value of the comparison point is NtbSta, the value of the reference origin point is NtbCco, and the offset of the comparison point relative to the reference origin point in one power cycle is NtbOffset.

Preferably, the determining the phase of the communication node to be identified according to the offset specifically includes:

dividing a network reference time value Ntbperiod corresponding to one power cycle into 12 sections in advance, and presetting the corresponding relation between the sections and the phases according to the phase of the zero-crossing network reference time NTB information of the starting time of the power cycle;

and when the offset is not greater than a preset maximum offset threshold, judging the interval to which the offset belongs, and determining the phase of the communication node to be identified according to the interval to which the offset belongs and the corresponding relation.

Preferably, the network reference time value NtbPeriod corresponding to one power cycle is divided into 12 sections in advance, and the correspondence between the phase preset section and the phase according to the zero-crossing network reference time NTB information at the start time of the power cycle is specifically:

defining NtbCut12 as each interval length value, then:

ntbtcut 12= [ ntbtperiod/12 ], wherein the ntbtcut 12 is a non-zero integer;

the equal boundary limit of the 12 intervals is recorded as: an array NtbCut [ i ] = NtbCut12 × i, where i is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12;

when the zero-crossing network reference time NTB information of the power cycle starting moment is phase A, the corresponding relation is as follows:

the intervals [ NtbCut [0], ntbCut [1 ]) correspond to phases: phase A;

the phases corresponding to the intervals [ NtbCut [1], ntbCut [3 ]) are: c phase;

the intervals [ NtbCut [3], ntbCut [5 ]) correspond to phases: phase B;

the intervals [ NtbCut [5], ntbCut [7 ]) correspond to phases: phase A;

the intervals [ NtbCut [7], ntbCut [9 ]) correspond to phases: c phase;

the intervals [ NtbCut [9], ntbCut [11 ]) correspond to phases: phase B;

the phases corresponding to the intervals [ NtbCut [11], ntbCut [12] ] are: phase A;

when the zero-crossing network reference time NTB information of the power cycle starting moment is a B phase, the corresponding relation is as follows:

the intervals [ NtbCut [0], ntbCut [1 ]) correspond to phases: phase B;

the phases corresponding to the intervals [ NtbCut [1], ntbCut [3 ]) are: phase A;

the intervals [ NtbCut [3], ntbCut [5 ]) correspond to phases: c phase;

the intervals [ NtbCut [5], ntbCut [7 ]) correspond to phases: phase B;

the intervals [ NtbCut [7], ntbCut [9 ]) correspond to phases: phase A;

the phases corresponding to the intervals [ NtbCut [9], ntbCut [11 ]) are: c phase;

the phases corresponding to the intervals [ NtbCut [11], ntbCut [12] ] are: phase B;

when the zero-crossing network reference time NTB information of the power cycle starting moment is C phase, the corresponding relation is as follows:

the intervals [ NtbCut [0], ntbCut [1 ]) correspond to phases: c phase;

the intervals [ Ntbcut [1], ntbcut [3 ]) correspond to phases: phase B;

the intervals [ NtbCut [3], ntbCut [5 ]) correspond to phases: phase A;

the intervals [ NtbCut [5], ntbCut [7 ]) correspond to phases: c phase;

the intervals [ NtbCut [7], ntbCut [9 ]) correspond to phases: phase B;

the phases corresponding to the intervals [ NtbCut [9], ntbCut [11 ]) are: phase A;

the phases corresponding to the intervals [ NtbCut [11], ntbCut [12] ] are: and C phase.

Preferably, the determining the section to which the offset belongs and determining the phase of the communication node to be identified according to the section to which the offset belongs and the correspondence relationship specifically include:

the number PhaseVal of the ntbtcut 12 in the offset is calculated by the following formula,

PhaseVal = [ NtbOffset/NtbCut12], wherein the PhaseVal takes the values of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11;

when the reference origin is the a-phase,

when the PhaseVal is any one of 0, 5, 6 and 11, the phase of the communication node to be identified is as follows: phase A;

when the PhaseVal is any one of 3, 4, 9 and 10, the phase of the communication node to be identified is as follows: phase B;

when the PhaseVal is any one of 1, 2, 7 and 8, the phase of the communication node to be identified is as follows: c phase;

when the reference origin is the phase B,

when the PhaseVal is any one of 0, 5, 6 and 11, the phase of the communication node to be identified is as follows: phase B;

when the PhaseVal is any one of 3, 4, 9 and 10, the phase of the communication node to be identified is as follows: c phase;

when the PhaseVal is any one of 1, 2, 7 and 8, the phase of the communication node to be identified is as follows: phase A;

when the reference origin is the C-phase,

when the PhaseVal is any one of 0, 5, 6 and 11, the phase of the communication node to be identified is as follows: c phase;

when the PhaseVal is any one of 3, 4, 9 and 10, the phase of the communication node to be identified is as follows: phase A;

when the PhaseVal is any one of 1, 2, 7 and 8, the phase of the communication node to be identified is as follows: and (B) phase.

Preferably, when the comparison point and the reference origin point are both the rising edge acquisition information or both the falling edge acquisition information, the method further includes:

determining a zero-fire reverse connection state of the communication node to be identified according to the offset;

wherein, the zero fire reverse connection state is as follows: normal wiring or zero-fire reverse connection;

the determining of the zero-fire reverse connection state of the communication node to be identified according to the offset specifically comprises:

when the PhaseVal is any one of 0, 3, 4, 7, 8 and 11, the zero-fire reverse connection state of the communication node to be identified is as follows: normal wiring;

when the PhaseVal is any one of 1, 2, 5, 6, 9 and 10, the zero-fire reverse connection state of the communication node to be identified is as follows: and reverse connection is carried out on zero fire.

Preferably, before the method is executed, the method further comprises:

and judging whether the current environment is a strong-current environment and whether unidentified communication nodes exist, and if the current environment is a strong-current environment and the unidentified communication nodes exist, executing the method.

Preferably, the determining whether the current environment is a strong electric environment specifically includes:

and executing the operation of acquiring local zero-crossing network reference time NTB information within preset time, checking whether zero-crossing network reference time NTB information exists, and if so, determining that the current network reference time NTB information is in a strong current environment.

In a second aspect, an embodiment of the present invention provides a phase identification apparatus, which is disposed in a master node of a low voltage power line broadband communication network, and at least includes:

the first zero-crossing Network Time Base (NTB) information acquisition module is configured to acquire NTB information of local one or more phases and record the NTB information as first NTB information;

the second zero-crossing NTB information acquisition module is used for acquiring the zero-crossing network reference time NTB information of the communication node to be identified and recording the information as the second zero-crossing network reference time NTB information;

the reference origin and comparison point selection module is set to select only one zero-crossing network reference time NTB of any phase in the first zero-crossing network reference time NTB information as a reference origin; selecting only one zero-crossing network reference time NTB in the second zero-crossing network reference time NTB information as a comparison point;

an offset calculation module configured to calculate an offset of the comparison point with respect to the reference origin point within one power cycle;

and the phase identification module is arranged to determine the phase of the communication node to be identified according to the offset.

In a third aspect, an embodiment of the present invention provides a communication apparatus, including a memory and a processor, where the processor executes program instructions in the memory, so as to implement the method in the first aspect.

In a fourth aspect, an embodiment of the present invention provides a communication system, including at least: a low voltage power line broadband communication network master node provided with the communication device of the second aspect.

In a fifth aspect, an embodiment of the present invention provides a storage medium, where the storage medium is used to store a computer program, and the computer program is used to implement the method described in the first aspect.

According to the embodiment of the invention, the offset of any one locally acquired zero-crossing NTB information and one locally acquired zero-crossing NTB information of the communication node to be identified are calculated, a twelve-component method identification method is adopted, the phase of the communication node to be identified can be identified according to the offset, the calculation is simple, and the identification is high-speed and accurate.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is a structural model of a low-voltage broadband PLC network system;

FIG. 2 is a flow chart of a phase identification method of an embodiment of the present invention;

fig. 3 is a flowchart of acquiring zero-crossing NTB information of a communication node to be identified according to an embodiment of the present invention;

FIG. 4 is a three-phase zero crossing timing sequence representation diagram when the reference origin is the A-phase rising edge acquisition according to the embodiment of the present invention;

FIG. 5 is a three-phase zero crossing timing sequence representation diagram when the reference origin is the A-phase falling edge acquisition in the embodiment of the present invention;

FIG. 6 is a three-phase zero crossing timing sequence representation diagram when the reference origin is B-phase rising edge acquisition according to the embodiment of the present invention;

FIG. 7 is a three-phase zero crossing timing sequence representation diagram when the reference origin is B-phase falling edge acquisition according to the embodiment of the present invention;

FIG. 8 is a three-phase zero crossing timing sequence representation diagram when the reference origin is C-phase rising edge acquisition according to an embodiment of the present invention;

FIG. 9 is a three-phase zero crossing timing sequence representation diagram when the reference origin is C-phase falling edge acquisition according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a phase recognition apparatus according to an embodiment of the present invention;

fig. 11 is a schematic hardware configuration diagram of a communication apparatus according to an embodiment of the present invention.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Furthermore, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Meanwhile, it should be understood that, in the following description, the "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that 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. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The phase identification method is based on a zero-crossing detection method, and the technical premise is that: network time synchronization is needed, and a master node device and a slave node device in the network are provided with zero-crossing circuits, wherein the network time synchronization means that NTBs of the master node device and the slave node device are synchronous, and the zero-crossing circuits are used when acquiring zero-crossing NTB information.

Fig. 1 is a structural model of a low-voltage broadband PLC network system, as shown in fig. 1, the system includes the following nodes: a Central Controller (CCO), a workstation (STA); there may also be a Proxy Controller (PCO), a proxy workstation (PSTA) and a hidden workstation (HSTA) in the system. Only one CCO can exist in one network, and other STAs operate under the cooperation of the CCOs. STAs that cannot communicate directly with the CCO are HSTAs, which communicate with other nodes in the system through Proxy Controllers (PCOs) or proxy workstations (PSTAs).

In the practical application of the meter reading system based on the low-voltage broadband PLC, in general, the CCO is in communication connection with the concentrator, and the STA is in communication connection with the communication node, namely the user electric meter, so that the concentrator communicates with the communication node through the CCO and then through the STA, and therefore transmission of protocol related command information and acquisition of user electricity utilization data are achieved.

Fig. 2 is a flowchart of a phase identification method according to an embodiment of the present invention, where the method is applied to a master node of a low-voltage power line broadband communication network, and for a low-voltage broadband PLC network, the master node is a CCO, and a slave node is an STA, specifically as shown in fig. 2, the method includes the following steps:

step S210: acquiring zero-crossing network reference time NTB information of one or more local phases, and recording the information as first zero-crossing network reference time NTB information;

it should be noted that: local means the equipment where the main node is located, and the equipment where the main node is located uses low-voltage alternating current, so that the equipment has voltages of three phases of A, B and C. "NTB" is an abbreviation for "Network Time Base" and means "Network reference Time".

The zero-crossing NTB information obtained in this step may be of one phase of a, B, and C, or may be of multiple phases, for example: in specific implementation, zero-crossing NTB information of three phases a, B and C can be acquired by default, so that the phase-lack condition can be judged.

Specifically, how to acquire the local three-phase zero-crossing NTB information may be according to the method in the prior art.

Step S220: acquiring zero-crossing network reference time NTB information of a communication node to be identified, and recording the information as second zero-crossing network reference time NTB information;

the implementation process of the step is carried out through message interaction between the CCO and the STA at the communication node side to be identified. As shown in fig. 3, the method comprises the following steps:

step S221: and the CCO sends a zero-crossing NTB acquisition indication message to the STA.

The format of the zero-crossing NTB acquisition indication message is as follows:

collecting quantity: representing the total number of zero crossings NTB that need to be acquired. Namely: after the indication message is issued, the total number of zero crossing point NTBs needs to be continuously collected at the specified station.

In the invention, the number of zero-crossing NTBs needed to be used in specific phase identification is not large, so that the zero-crossing NTB information acquired by the CCO indication STA does not require much, and the specific acquisition number is generally set to be single digit or a number within 20 according to an empirical value, so that the setting has the advantages that: frequent zero-crossing interrupt processing and excessive zero-crossing data buffering can be reduced.

Step S222: and the STA receives the zero-crossing NTB acquisition indication message issued by the CCO, acquires and stores the zero-crossing NTB information according to the configuration requirement in the message.

How to acquire zero-crossing NTB information by the STA can be realized according to the method in the prior art.

Step S223: and the STA reports the acquired zero-crossing NTB data to the CCO through a zero-crossing NTB notification message specified in the PLC protocol.

Specifically, the definition of the zero-crossing NTB notification message format is shown in the following table:

wherein, TEI represents a station informing NTB information of zero crossing; the total number of advertisements represents the number of zero crossings NTB advertised by the station; the phase line difference informing quantity represents the quantity of the zero-crossing NTB difference value of the corresponding phase line informed by the station. The reference NTB represents a station-informed reference NTB. This NTB is the first zero crossing NTB value that the station advertises, and is the reference NTB that subsequent zero crossings NTB use to calculate the difference. The NTB value stored in this field is the acquired zero-crossing point NTB value, i.e., the original 32-bit data, and the data after right shifting by 8 bits is equivalent to the high 24-bit data of the original data.

The method for calculating the zero-crossing NTB difference value comprises the following steps: starting with the reference NTB, calculating the difference between each subsequent zero-crossing NTB and the previous NTB; and right shifting the calculated difference data by 8 bits, and only reserving a high-bit part. And taking the finally obtained difference as a zero-crossing NTB difference, storing the zero-crossing NTB difference into a field of zero-crossing NTB difference according to a time sequence, and reporting the CCO.

It should be noted that: in the power frequency period of the power line, the interval of zero-crossing points is generally about 10ms, and the NTB difference between two zero-crossing points does not exceed the representation interval of 20 bits. Therefore, the zero-crossing point NTB difference needs to be represented by a 12-bit field after being shifted by 8 bits in the right direction.

Step S224: after receiving the zero-crossing NTB notification message reported by the STA, the CCO extracts zero-crossing NTB information from the message and records the zero-crossing NTB information as second zero-crossing network reference time NTB information.

It should be noted that, the steps S210 and S220 are not executed in the order of executing the step S210 first and then executing the step S220, and the step S220 may be executed first and then executing the step S210.

Step S230: selecting only one zero-crossing network reference time NTB of any phase in the first zero-crossing network reference time NTB information as a reference origin; selecting only one zero-crossing network reference time NTB in the second zero-crossing network reference time NTB information as a comparison point;

the reference origin in this step is selected based on the first zero-crossing NTB information obtained in step S210, and only one zero-crossing NTB information is selected from the first zero-crossing NTB information as the reference origin, where the reference origin may be any one of the zero-crossing NTB information in any one of the phases a, B, and C.

The selection of the comparison point in this step is based on the second zero-crossing NTB information obtained in step S220, and only one zero-crossing NTB information is selected as the comparison point, which needs to be noted: the selected comparison point and the reference origin point can be used for acquiring information at the same rising edge or at the same falling edge, or one of the comparison points can be used for acquiring information at the rising edge and the other one can be used for acquiring information at the falling edge. Specifically, the following are mentioned: when the comparison point and the reference origin point are both used as rising edge acquisition information or both used as falling edge acquisition information, the phase identification of the communication node to be identified can be carried out, and the zero-fire reverse connection state identification of the communication node to be identified can also be carried out according to the requirement.

In this step, when calculating the offset of the comparison point with respect to the reference origin in one power cycle, the offset may be calculated by the following formula:

NtbOffset＝(NtbSta–NtbCco)Mod NtbPowerPeriod；

wherein, ntbPowerPeriod is a network reference time value corresponding to a power cycle, ntbSta is a value of the comparison point, ntbCco is a value of the reference origin, and ntbfset is an offset of the comparison point relative to the reference origin in a power cycle.

"Mod" in the above two formulas is a remainder operator, which is an operator that divides the difference between NtbSta and NtbCco by ntbpower period and returns the remainder. The remainder is based on that the two zero-crossing NTB data of the difference may not be in one power cycle, and the resulting offset ntoffset is guaranteed to be in one power cycle by the remainder.

Ideally, a power cycle is 20ms, but in practice, the power cycle fluctuates slightly in the grid, and may be slightly greater than 20ms or slightly less than 20 ms. Therefore, when the nttb STA-ntbco is too large, it means that the time interval between the zero-crossing NTB data collected by the CCO and the zero-crossing NTB data collected by the STA is too long, which is caused by the accumulated error due to the drift of the power cycle value, so that the calculated nttboffset value will deviate from the true value, and further the accuracy of the subsequent phase identification will be affected.

According to repeated experiments, if the value of the nttbsta-NtbCco exceeds 1.5 seconds, errors are accumulated, the value of the NtbOffset deviates from the true value, and the phase is erroneously determined. In this case, it is determined that the NtbOffset is invalid, and the next phase recognition process is restarted by discarding the recognition. Based on this, a preset maximum offset threshold value of 1.5 seconds or other empirical values may be defined in a specific implementation, the offset is predetermined when determining the phase based on the offset in the following, and the phase is identified by using the offset when the offset is within the preset maximum offset threshold value.

Step S250: and determining the phase of the communication node to be identified according to the offset.

This step determines the phase of the communication node to be identified based on the NtbOffset calculated in step S240. In the phase identification process, the method is carried out by a twelve-point method, and the specific process is as follows:

first, a network reference time value NtbPeriod corresponding to one power cycle is divided into 12 sections in advance, assuming that: ntbCut12= [ NtbPeriod/12], that is: ntbCut12 is

One twelfth of NtbPeriod, then the number is rounded, so that NtbCut12 is a non-zero integer. An array NtbCut [ i ] = NtbCut12 × i, each of the equal-boundary limits, where i is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12.

Then, according to the corresponding relation between the phase preset interval and the phase of the zero-crossing network reference time NTB information (namely: the reference origin) at the power cycle starting time, if the phase corresponding to the zero-crossing network reference time NTB information at the power cycle starting time is combined with the collection edge type, six conditions are provided, specifically: the phase-A rising edge, the phase-A falling edge, the phase-B rising edge, the phase-B falling edge, the phase-C rising edge and the phase-C falling edge. The zero-crossing network reference time NTB information of the starting time of one power cycle corresponds to different three-phase zero-crossing timing sequence diagrams under each condition, and fig. 4 to 9 are three-phase zero-crossing timing sequence diagrams under each condition respectively, wherein the vertical axis is voltage, and the horizontal axis is a time axis.

As can be seen from fig. 4 to 9, when the zero-crossing NTB information at the start time of the power cycle is phase a, the correspondence relationship is:

the intervals [ NtbCut [0], ntbCut [1 ]) correspond to phases: phase A;

the intervals [ NtbCut [3], ntbCut [5 ]) correspond to phases: phase B;

the intervals [ NtbCut [5], ntbCut [7 ]) correspond to phases: phase A;

the intervals [ NtbCut [7], ntbCut [9 ]) correspond to phases: c phase;

the phases corresponding to the intervals [ NtbCut [9], ntbCut [11 ]) are: phase B;

the phases corresponding to the intervals [ NtbCut [11], ntbCut [12] ] are: and (4) phase A.

When the zero-crossing NTB information of the power cycle starting moment is a B phase, the corresponding relation is as follows:

the intervals [ NtbCut [0], ntbCut [1 ]) correspond to phases: phase B;

the intervals [ NtbCut [3], ntbCut [5 ]) correspond to phases: c phase;

the intervals [ NtbCut [5], ntbCut [7 ]) correspond to phases: phase B;

the intervals [ NtbCut [7], ntbCut [9 ]) correspond to phases: phase A;

the intervals [ NtbCut [9], ntbCut [11 ]) correspond to phases: c phase;

the phases corresponding to the intervals [ NtbCut [11], ntbCut [12] ] are: and (B) phase.

When the zero-crossing NTB information at the power cycle start time is phase C, the correspondence relationship is:

the intervals [ NtbCut [0], ntbCut [1 ]) correspond to phases: c phase;

the intervals [ Ntbcut [1], ntbcut [3 ]) correspond to phases: phase B;

the intervals [ NtbCut [3], ntbCut [5 ]) correspond to phases: phase A;

the intervals [ Ntbcut [5], ntbcut [7 ]) correspond to phases: c phase;

the intervals [ NtbCut [7], ntbCut [9 ]) correspond to phases: phase B;

And finally, judging whether the offset is within a preset maximum offset threshold, judging the interval to which the offset belongs when the offset is not greater than the preset maximum offset threshold, and determining the phase of the communication node to be identified according to the interval to which the offset belongs and the corresponding relation.

Specifically, when determining the interval to which the offset belongs, it may first calculate how many ntbcuts 12 in the offset ntbfset, and then search for the corresponding interval according to the obtained result, and assuming that PhaseVal is the obtained result value, it may specifically be calculated by the following formula:

PhaseVal＝[NtbOffset/NtbCut12]

wherein, phaseVal is the result of rounding the difference between NtbOffset and Ntbcut12, and takes values of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11.

As described above, when the reference origin and the comparison point are selected, both of them may be used for acquiring information for a rising edge, or one of them may be used for acquiring information for a rising edge, and the other one is used for acquiring information for a falling edge, which does not affect the identification of the phase of the communication node to be identified, in any case, in practical application, when both of them are used for acquiring information for a rising edge or acquiring information for a falling edge, in this case, not only the phase identification of the communication node to be identified, but also the identification of the zero-fire reverse connection state may be performed, and specifically, the determination may be performed according to the calculated PhaseVal. Wherein, the zero fire reverse connection state is as follows: normal wiring or zero fire reverse connection.

As shown in fig. 4 to 9, the correspondence table of the PhaseVal value, the phase of the reference origin, the acquisition edge type and the phase is as follows:

as shown in fig. 4 to 9, the voltage waveform formed by inverting the a-phase voltage waveform (i.e., changing the wave crest into the wave trough) is the voltage waveform after the a-phase reverse connection, similarly, the voltage waveform formed by inverting the B-phase voltage waveform is the voltage waveform after the B-phase reverse connection, and the voltage waveform formed by inverting the C-phase voltage waveform is the voltage waveform after the C-phase reverse connection, so that the zero-fire reverse connection state corresponding to each PhaseVal value can be determined by corresponding each inverted voltage waveform to each interval. The correspondence table of the PhaseVal value, the phase of the reference origin, the collection edge type and the zero-fire reverse connection state information is as follows:

wherein, the "+" sign in the zero fire reverse connection state information represents normal connection, and the "-" sign represents zero fire reverse connection.

It can thus be seen that:

when the value of PhaseVal is 0, corresponding intervals [ NtbCut [0], ntbCut [1 ]);

when PhaseVal takes values of 1 and 2, the corresponding interval [ NtbCut [1], ntbCut [3 ]);

when the value of PhaseVal is 3 and 4, corresponding interval [ NtbCut [3], ntbCut [5 ]);

when the value of PhaseVal is 5 and 6, the corresponding interval [ NtbCut [5], ntbCut [7 ]);

when the value of PhaseVal is 7 and 8, corresponding interval [ NtbCut [7], ntbCut [9 ]);

when the value of PhaseVal is 9 and 10, corresponding interval [ NtbCut [9], ntbCut [11 ]);

when the PhaseVal takes the value of 11, the corresponding interval [ NtbCut [11], ntbCut [12] ];

then, for the phase identification,

when the reference origin is the a-phase,

when the PhaseVal is any one of 0, 5, 6, and 11, the phase of the communication node to be identified is: phase A;

when the PhaseVal is any one of 3, 4, 9 and 10, the phase of the communication node to be identified is: phase B;

when the PhaseVal is any one of 1, 2, 7 and 8, the phase of the communication node to be identified is: c phase;

when the reference origin is the B-phase,

when the PhaseVal is any one of 0, 5, 6, and 11, the phase of the communication node to be identified is: phase B;

when the PhaseVal is any one of 3, 4, 9 and 10, the phase of the communication node to be identified is: c phase;

when the PhaseVal is any one of 1, 2, 7 and 8, the phase of the communication node to be identified is: phase A;

when the reference origin is the phase C,

when the PhaseVal is any one of 0, 5, 6, and 11, the phase of the communication node to be identified is: c phase;

when the PhaseVal is any one of 3, 4, 9 and 10, the phase of the communication node to be identified is: phase A;

when the PhaseVal is any one of 1, 2, 7 and 8, the phase of the communication node to be identified is: phase B;

for the identification of a zero fire reverse condition,

when the PhaseVal takes any one of the values of 0, 3, 4, 7, 8 and 11, the zero-fire reverse connection state of the communication node to be identified is as follows: normal wiring;

when the PhaseVal takes any one of

values

1, 2, 5, 6, 9 and 10, the zero-fire reverse connection state of the communication node to be identified is as follows: and reverse connection is carried out on zero fire.

According to the corresponding relation, the phase position and the zero-fire reverse connection state of the communication node to be identified can be determined.

In practical applications, the CCO starts to execute the phase identification method after networking is completed or the number of network access nodes exceeds a certain number. Before phase identification is carried out according to the method, whether the current environment is in a strong current environment or not and whether unidentified communication nodes exist or not are judged, and the method for specifically judging whether the current environment is in the strong current environment is as follows: and executing the operation of acquiring local zero-crossing NTB information within preset time, checking whether zero-crossing NTB information exists, and if so, determining that the current environment is in a strong current environment. And if the current environment is a strong electric environment and unidentified communication nodes exist, executing the phase identification method flow.

Upon phase identification for an unidentified communication node, a phase identification timeout timer may be started for limiting the maximum time for the phase identification process to be performed to balance the performance of other high priority tasks.

It can be known from the above steps that in the embodiment of the present invention, the offset between any one of the locally acquired zero-crossing NTB information and one of the zero-crossing NTB information of the communication node to be identified is calculated, and the phase of the communication node to be identified can be identified according to the offset by using the twelve-division method, so that the calculation is simple, and the identification is high-speed and accurate.

Fig. 10 is a schematic structural diagram of a phase identification device according to an embodiment of the present invention, which is disposed on a master node of a low-voltage power line broadband communication network, and includes at least the following modules:

a first zero-crossing NTB information obtaining module 101, configured to obtain zero-crossing network reference time NTB information of one or more local phases, which is recorded as first zero-crossing network reference time NTB information;

a second zero-crossing NTB information obtaining module 102, configured to obtain zero-crossing network reference time NTB information of the communication node to be identified, which is recorded as second zero-crossing network reference time NTB information;

a reference origin and comparison point selecting module 103 configured to select only one zero-crossing network reference time NTB of any phase in the first zero-crossing network reference time NTB information as a reference origin; selecting only one zero-crossing network reference time NTB in the second zero-crossing network reference time NTB information as a comparison point;

an offset calculation module 104 configured to calculate an offset of the comparison point with respect to the reference origin in one power cycle;

a phase identification module 105 configured to determine a phase of the communication node to be identified according to the offset.

Fig. 11 is a schematic hardware structure diagram of a communication device according to an embodiment of the present invention. As shown in fig. 11, the communication apparatus includes: a memory 111 and a processor 112, wherein the memory 111 and the processor 112 are in communication; illustratively, the memory 111 and the processor 112 communicate via a communication bus 113, the memory 111 being used for storing a computer program, the processor 112 executing the computer program to implement the method shown in the above embodiments.

Optionally, the communication device may further comprise a transmitter and/or a receiver.

Alternatively, the Processor may be a Central Processing Unit (CPU), or may be implemented by other general-purpose processors, a PLC (Programmable Logic Controller), an FPGA (Field-Programmable Gate Array), a DSP (Digital Signal Processor), or an ASIC (Application Specific Integrated Circuit). A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.

An embodiment of the present invention further provides a communication system, which at least includes: the low-voltage power line broadband communication network main node is provided with the communication device.

An embodiment of the present invention provides a storage medium, where the storage medium is used to store a computer program, and the computer program is used to implement the phase identification method described in any of the above method embodiments.

The embodiment of the present invention provides a chip, where the chip is used to support a receiving device (for example, a terminal device, a network device, and the like) to implement the functions shown in the embodiment of the present invention, and the chip is specifically used in a chip system, where the chip system may be formed by a chip, and may also include a chip and other discrete devices. When the chip in the receiving device implementing the method includes a processing unit, the chip may further include a communication unit, and the processing unit may be, for example, a processor, and when the chip includes the communication unit, the communication unit may be, for example, an input/output interface, a pin, a circuit, or the like. The processing unit executes all or part of the actions executed by the processing modules in the embodiment of the invention, and the communication unit executes corresponding receiving or sending actions. In another specific embodiment, the processing module of the receiving device in the embodiment of the present invention may be a processing unit of a chip, and the receiving module or the transmitting module of the control device is a communication unit of the chip.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, apparatus (device) or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may employ a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations of methods, apparatus (devices) and computer program products according to embodiments of the application. It will be understood that each flow in the flow diagrams can be implemented by computer program instructions.

These computer program instructions may be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows.

These computer program instructions may also be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows.

Another embodiment of the invention is directed to a non-transitory storage medium storing a computer-readable program for causing a computer to perform some or all of the above-described method embodiments.

That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be accomplished by specifying the relevant hardware through a program, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A phase identification method is applied to a main node of a low-voltage power line broadband communication network, and is characterized by at least comprising the following steps:

2. The method of claim 1, wherein the calculating the offset of the comparison point from the reference origin in one power cycle is performed by the following equation:

NtbOffset＝(NtbSta–NtbCco)Mod NtbPowerPeriod；

3. The method according to claim 2, wherein the determining the phase of the communication node to be identified according to the offset is specifically:

4. The method according to claim 3, wherein the network reference time value NtbPeriod corresponding to one power cycle is divided into 12 sections in advance, and the correspondence between the phase preset section and the phase according to the zero-crossing network reference time NTB information at the start time of the power cycle is specifically:

defining NtbCut12 as each interval length value, then:

ntbtut 12= [ NtbPeriod/12], wherein the ntbtcut 12 is a non-zero integer;

the equal boundary limit of the 12 intervals is recorded as: an array ntbtcut [ i ] = ntbtcut 12 × i, where i is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12;

the intervals [ NtbCut [0], ntbCut [1 ]) correspond to phases: phase A;

the intervals [ NtbCut [3], ntbCut [5 ]) correspond to phases: phase B;

the intervals [ Ntbcut [5], ntbcut [7 ]) correspond to phases: phase A;

the intervals [ NtbCut [7], ntbCut [9 ]) correspond to phases: c phase;

the intervals [ NtbCut [0], ntbCut [1 ]) correspond to phases: phase B;

the intervals [ NtbCut [3], ntbCut [5 ]) correspond to phases: c phase;

the intervals [ NtbCut [5], ntbCut [7 ]) correspond to phases: phase B;

the intervals [ NtbCut [7], ntbCut [9 ]) correspond to phases: phase A;

the intervals [ NtbCut [0], ntbCut [1 ]) correspond to phases: c phase;

the phases corresponding to the intervals [ NtbCut [1], ntbCut [3 ]) are: phase B;

the intervals [ Ntbcut [3], ntbcut [5 ]) correspond to phases: phase A;

the intervals [ NtbCut [5], ntbCut [7 ]) correspond to phases: c phase;

the intervals [ NtbCut [7], ntbCut [9 ]) correspond to phases: phase B;

the intervals [ NtbCut [9], ntbCut [11 ]) correspond to phases: phase A;

the phases corresponding to the intervals [ NtbCut [11], ntbCut [12] ] are: and (5) phase C.

5. The method according to claim 4, wherein the determining the section to which the offset belongs and determining the phase of the communication node to be identified according to the section to which the offset belongs and the correspondence relationship specifically include:

the number PhaseVal of the NtbCut12 in the offset is calculated by the following formula,

when the reference origin is the phase a,

when the reference origin is the phase B,

when the reference origin is the C-phase,

6. The method of claim 5, wherein when the comparison point is either both rising edge acquisition information or both falling edge acquisition information with the reference origin, the method further comprises:

the determining of the zero-fire reverse connection state of the communication node to be identified according to the offset specifically includes:

7. The method of any of claims 1-6, further comprising, prior to performing the method:

8. The method according to claim 7, wherein the determining whether the current environment is a strong electric environment includes:

and executing the operation of acquiring local zero-crossing network reference time NTB information within preset time, checking whether zero-crossing network reference time NTB information exists or not, and if so, determining that the current environment is in a strong current environment.

9. The utility model provides a phase place recognition device, sets up in low pressure power line broadband communication network main node, its characterized in that includes at least:

10. A communications apparatus comprising a memory and a processor, the processor executing program instructions in the memory for implementing the method of any one of claims 1 to 8.

11. A communication system, characterized by comprising at least: a low voltage power line broadband communication network master node provided with a communication device according to claim 10.

12. A storage medium for storing a computer program for implementing the method of any one of claims 1 to 8.