CN111736028B - Method for identifying phase and station area of user - Google Patents
Method for identifying phase and station area of user Download PDFInfo
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- CN111736028B CN111736028B CN202010733476.1A CN202010733476A CN111736028B CN 111736028 B CN111736028 B CN 111736028B CN 202010733476 A CN202010733476 A CN 202010733476A CN 111736028 B CN111736028 B CN 111736028B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/242—Home appliances
Abstract
The invention discloses a method for identifying a phase and a station area of a user, wherein the station area comprises a main node and a slave node electrically connected with the main node, the main node comprises a multiphase phase voltage, the slave node comprises the user, and the method comprises the following steps: s1, sending a voltage detection starting command; s2, generating voltage detection pulses corresponding to each phase voltage of the master node and voltage detection pulses corresponding to the phase voltage of the slave node based on the voltage peak value fluctuation and the zero crossing point phase jitter; and S3, judging the phase and the station area of the slave node based on the voltage detection pulse corresponding to the phase voltage of the slave node and the voltage detection pulse corresponding to the phase voltage of each phase of the master node. The phase and the station area of the slave node can be identified simultaneously, the voltage detection pulse is generated based on the information of two aspects of voltage peak value fluctuation and zero crossing point phase jitter, the phase and the station area of the slave node are judged, the identification precision is improved, and the misjudgment rate of the user variable relationship is reduced.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method for identifying a phase and a station area of a user.
Background
In a low-voltage power line system, a plurality of users are arranged below each transformer, but due to field construction wiring, the relationship between the users and the transformer is easy to be disordered in the later period, and meanwhile, the phase sequence of each user is difficult to clear, which brings great difficulty to the fine management of the smart grid. In order to clear the household variable relationship, improve the operation efficiency of the power grid, implement refined management and optimize the power supply network, the requirements of station area identification and phase identification are met. An electric power company usually adopts a transformer area identification instrument to identify the household-to-household relation, and technical requirements of transformer area identification and phase identification are gradually provided for an intelligent power grid communication module at present.
Most of the current station area identification technologies are based on zero crossing point modulation technologies, and current or corresponding characteristic signals need to be injected into a power line of the station area near a zero crossing point; in some cell identification technologies based on a communication system, such as narrowband zero-crossing communication or wideband carrier communication, cell identification is performed according to information such as a time slot beacon and signal attenuation of the system. However, the above method of identifying the cell needs special power hardware equipment, and the accuracy of identification needs to be improved.
The phase identification can provide the load information of each phase for the management in the transformer area, avoid the overweight load of a certain phase, realize the load balance of each phase and realize the refined high-efficiency power network management. The current phase identification technology is mainly to distinguish through a zero-crossing signal, and the two detection objects are mutually independent with the station area identification.
At present, under the condition of no power failure, the table area household variable relation and the table phase are difficult to check, and on site, due to the buried lines, overhead lines with complex guy wires and the like, the checking and removing work is difficult to carry out. Therefore, a method is needed to realize the identification of the user-dependent relationship and the automatic identification of the phase relationship in the existing meter reading communication module. At present, a plurality of related technologies are applied to a communication module, and the phase discrimination can be accurate, but the identification accuracy of the station-area subscriber variation relationship still needs to be improved. Meanwhile, some methods have the problems of higher cost, high realization difficulty and interference on the communication of the equipment in the transformer area.
For example, in the method for detecting the zero-crossing point offset of the cell by narrow-band carrier communication proposed in patent application publication No. CN102075213A, the method has low detection precision, and the zero-crossing points between different cell zones are not necessarily shifted by more than 150us if they are shifted by the same medium-voltage power line, so the accuracy of cell-to-cell relationship identification is actually low, and the accurate identification rate of the field use is only about 60%.
The patent application publication No. CN106253950A utilizes the network logic topology of the broadband carrier in combination with the variation trend characteristic of the node average voltage to perform comprehensive judgment. But in fact, there is a large error between the communication network logic topology and the actual physical topology of the carrier, and meanwhile, cross-cell communication often occurs in the broadband carrier, and the logic topology cannot accurately judge whether the nodes are in the same cell. Meanwhile, under the condition that the load rate of the cell is not high, the average voltage of the node is generally consistent between adjacent cells, so that the method has a certain misjudgment rate when identifying the cell-to-cell relationship.
Therefore, how to design a technical solution with high accuracy for station area identification and phase identification is an urgent technical problem to be solved in the industry.
Disclosure of Invention
In order to solve the technical problem of high misjudgment rate of station area identification and phase identification in the prior art, the invention provides a method for identifying a phase and a station area to which a user belongs.
The technical scheme adopted by the invention is as follows:
a method for identifying a phase to which a user belongs and a station area, the station area including a master node and a slave node electrically connected to the master node, the master node including a multiphase phase voltage, the slave node including a user, the method comprising: s1, sending a voltage detection starting command; s2, generating voltage detection pulses corresponding to each phase voltage of the master node and voltage detection pulses corresponding to the phase voltage of the slave node based on the voltage peak value fluctuation and the zero crossing point phase jitter; and S3, judging the phase and the station area of the slave node based on the voltage detection pulse corresponding to the phase voltage of the slave node and the voltage detection pulse corresponding to the phase voltage of each phase of the master node.
In one embodiment, the S2 includes: detecting each phase voltage near a zero crossing point of each phase voltage of the main node, and generating a voltage detection pulse corresponding to each phase voltage of the main node when each phase voltage reaches a threshold value VT; the phase voltage of the phase to which the slave node belongs is detected in the vicinity of a zero crossing point of the phase voltage, and a voltage detection pulse corresponding to the phase voltage of the phase to which the slave node belongs is generated when the phase voltage of the phase to which the slave node belongs reaches a threshold value VT.
In one embodiment, the S3 includes: and judging to obtain the phase of the slave node and the station area of the slave node based on the period of the voltage detection pulse corresponding to the phase voltage of the slave node and the period of the voltage detection pulse corresponding to the phase voltage of each phase of the master node.
In one embodiment, the determining the phase and the station area to which the slave node belongs based on the period of the voltage detection pulse corresponding to the phase voltage to which the slave node belongs and the period of the voltage detection pulse corresponding to the phase voltage of each phase of the master node includes: subtracting the periods of the adjacent voltage detection pulses corresponding to the phase voltage of the slave node to obtain the period variation of the adjacent voltage detection pulses corresponding to the phase voltage of the slave node; subtracting the periods of the adjacent voltage detection pulses corresponding to the phase voltages of the main node to obtain the period variation of the adjacent voltage detection pulses corresponding to the phase voltages of the main node; and judging the phase and the distribution area of the slave node according to the period variation of the adjacent voltage detection pulse corresponding to the phase voltage of the slave node and the period variation of the adjacent voltage detection pulse corresponding to the phase voltage of each phase of the master node.
In one embodiment, the determining the phase and the distribution area to which the slave node belongs according to the period variation of the adjacent voltage detection pulse corresponding to the phase voltage to which the slave node belongs and the period variation of the adjacent voltage detection pulse corresponding to the phase voltage of each phase of the master node includes: comparing the period variation of the adjacent voltage detection pulse corresponding to the phase voltage to which the slave node belongs with a positive bias threshold VT1 and a negative bias threshold VT2, respectively; comparing the cycle variation of the adjacent voltage detection pulse corresponding to each phase voltage of the main node with a positive bias threshold VT1 and a negative bias threshold VT2 respectively; inputting the comparison result into the accumulator corresponding to each phase of the main node; if the result of the accumulator corresponding to a certain phase of the main node is larger than a preset phase threshold value, judging that the certain phase of the main node is the phase to which the corresponding slave node belongs, and the station area is the station area to which the corresponding slave node belongs; or if the result of the accumulator corresponding to each phase of the main node is smaller than the preset phase threshold, judging that the corresponding slave node does not belong to the distribution area.
In one embodiment, the inputting the comparison result into the accumulator corresponding to each phase of the master node further comprises: if the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node and the period variation of the adjacent voltage detection pulse of the certain phase voltage of the master node are both greater than the positive bias threshold VT1, adding one to the accumulator corresponding to the phase of the master node; or if the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node and the period variation of the adjacent voltage detection pulse of the phase voltage of the master node are both smaller than the negative bias threshold VT2, adding one to the accumulator corresponding to the phase of the master node; or if the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node and the period variation of the adjacent voltage detection pulse of the phase voltage of the master node are both between the negative bias threshold VT2 and the positive bias threshold VT1, adding one to the accumulator corresponding to the phase of the master node; or if the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node is greater than the positive bias threshold VT1 and the period variation of the adjacent voltage detection pulse of the phase voltage of the master node is less than the negative bias threshold VT2, subtracting one from the accumulator corresponding to the phase of the master node; or if the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node is smaller than the negative bias threshold VT2 and the period variation of the adjacent voltage detection pulse of the phase voltage of the master node is larger than the positive bias threshold VT1, the accumulator corresponding to the phase of the master node is reduced by one.
In one embodiment, the period variation amounts of the adjacent voltage detection pulses of the phase voltage to which the slave node belongs are respectively compared with a positive bias threshold VT1 and a negative bias threshold VT 2; comparing the cycle variation of adjacent voltage detection pulses of each phase voltage of the main node with a positive bias threshold VT1 and a negative bias threshold VT2 respectively; inputting the comparison results into the accumulators corresponding to the phases of the main node respectively comprises: comparing the cycle variation of the adjacent voltage detection pulse of the phase voltage belonging to the node with a positive bias threshold VT1 and a negative bias threshold VT2 respectively for a plurality of times; comparing the cycle variation of adjacent voltage detection pulses of each phase voltage of the main node with a positive bias threshold VT1 and a negative bias threshold VT2 for multiple times; the comparison results are input to accumulators corresponding to the phases of the master node, respectively, a plurality of times.
In one embodiment, between S2 and S3, the method further includes: and sending the information of the voltage detection pulse of each phase voltage of the main node and the station area number to the slave node.
In one embodiment, after S3, the method further includes feeding back information of the phase and the cell belonging to the slave node to the master node.
In one embodiment, after S3, the method further includes feeding back information of the phase and the station zone of the slave node to the background system.
Compared with the prior art, the method can simultaneously identify the phase and the station area to which the slave node belongs, generates the voltage detection pulse based on the information of two aspects of voltage peak value fluctuation and zero-crossing point phase jitter, judges the phase and the station area to which the slave node belongs, improves the identification precision, and reduces the misjudgment rate of the user variable relationship.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic flow chart illustrating a method for identifying a phase and a cell to which a user belongs according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for identifying a phase and a cell to which a user belongs according to a preferred embodiment of the present invention;
fig. 3 is a schematic view of a power supply and distribution network scene structure applied to a method for identifying a phase and a distribution area to which a user belongs according to an embodiment of the present invention;
fig. 4 is a schematic diagram of phase voltage waveforms for voltage peak fluctuation and zero crossing point phase jitter in a power distribution network according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
Referring to fig. 3, in the distribution network, each transformer area is used for converting low-voltage three-phase power to output to residential users through high-power transformers in the medium-voltage distribution network. Each user obtains the power supply required by the user from one or three phases of the three-phase power. The transformer area comprises a main node and a slave node electrically connected with the main node, wherein the main node is a concentrator, and the slave node is a user (user electric meter). One transformer area may be equipped with at least one transformer and at least one concentrator, which is installed near the transformer for collecting information of multiphase phase voltages outputted from the output terminal of the transformer. The concentrator is also electrically connected to each slave node either directly or indirectly through other slave nodes to manage all the slave nodes of the cell. The power supply and distribution network is subjected to fine management, the power supply and distribution network can be optimized, and the operation efficiency of the power supply and distribution network is improved. The refined management of the power supply and distribution network is based on the clear user variation relationship in the power supply and distribution network, and therefore, the demands for station area identification and phase identification of the user are generated.
Referring to fig. 4, the present invention provides a method for identifying a phase and a station area to which a user belongs, and the method provided by the present invention is based on the following principle: due to the fact that the structure of the power supply and distribution network is very complex, the problem of unbalance of power supply of each phase line can exist. In addition, different loads are operated, and the instantaneous characteristics of the voltages among the phases are inconsistent. The imbalance and inconsistency are expressed as fluctuations in voltage peak values and jitter in phase of zero-crossing points. Based on the phenomenon, the invention adopts a fixed threshold value VT to compare phase voltages of each phase of the alternating current, and integrates information of voltage peak value fluctuation and zero crossing point phase jitter into period jitter of voltage detection pulse. Specifically, when the peak voltage of a certain phase voltage period increases, the period of the corresponding voltage detection pulse increases, and when the voltage peak value of a certain phase voltage period decreases, the period of the corresponding voltage detection pulse decreases. When the zero-crossing point phase is dithered to the right, the period of the corresponding voltage detection pulse increases, and when the zero-crossing point phase is dithered to the left, the period of the corresponding voltage detection pulse decreases. Therefore, by calculating the periodic variation of the voltage detection pulse, the voltage peak fluctuation and zero-crossing point phase jitter of the phase voltage can be reversely deduced. The fluctuation of the voltage peak value of the phase voltage and the jitter of the phase of the zero crossing point are information which can reflect the characteristics of the phase voltage of the transformer area, and compared with the single adoption of the fluctuation of the voltage peak value or the jitter information of the phase of the zero crossing point, different transformer areas and different phases can be more effectively distinguished.
Referring to fig. 1, based on the above principle, the method for identifying the phase and the station area of the user provided by the present invention mainly includes: step S1, sending a voltage detection starting command; step S2, generating voltage detection pulses corresponding to each phase voltage of the master node and voltage detection pulses corresponding to the phase voltage of the slave node based on the voltage peak value fluctuation and the zero crossing point phase jitter; and step S3, judging the phase position and the station area of the slave node based on the voltage detection pulse corresponding to the phase voltage of the slave node and the voltage detection pulse corresponding to the phase voltage of each phase of the master node. The phase and the station area of the slave node can be identified simultaneously, the voltage detection pulse is generated based on the information of two aspects of voltage peak value fluctuation and zero crossing point phase jitter, the phase and the station area of the slave node are judged, the identification precision is improved, and the misjudgment rate of the user variable relationship is reduced.
Referring to FIG. 2, the steps of the method provided by the present invention are further described in detail.
Step S1, a voltage detection start command is sent.
Specifically, the master node broadcasts and transmits a voltage detection start command to each slave node. The voltage detection starting command comprises starting time of voltage detection and the number of voltage detection pulses required to be collected by the voltage detection. The voltage detection pulse is generated based on the phase voltages and indicates a change in the phase voltages. If the change conditions of the voltage detection pulses of two phase voltages corresponding to a certain two nodes are consistent, the two phase voltages belong to the same phase.
And step S2, generating voltage detection pulses corresponding to the phase voltages of the phases of the master node and the slave node based on the voltage peak value fluctuation and the zero crossing point phase jitter.
Specifically, step S2 includes: detecting each phase voltage near a zero crossing point of each phase voltage of the main node, and generating a voltage detection pulse corresponding to each phase voltage of the main node when each phase voltage reaches a threshold value VT; the phase voltage of the phase to which the slave node belongs is detected in the vicinity of a zero crossing point of the phase voltage, and a voltage detection pulse corresponding to the phase voltage of the phase to which the slave node belongs is generated when the phase voltage of the phase to which the slave node belongs reaches a threshold value VT.
It should be noted that, in an embodiment, the main node is a concentrator, and collects information of three-phase voltages output by the output end of the transformer because the main node is electrically connected to three-phase four wires at the output end of the transformer. The main node thus comprises three phase voltages and there are three voltage detection pulses corresponding to the voltages of the phases of the main node. Specifically, the output end of the transformer comprises an A phase, a B phase, a C phase and an N line. The voltage detection pulses corresponding to the phase voltages of the main node are phase voltage detection pulses of A phase, phase voltage detection pulses of B phase and phase voltage detection pulses of C phase. In this embodiment, the slave node is a user, one of the a-phase, B-phase, and C-phase output from the transformer output terminal is electrically connected to the slave node, and the voltage detection pulse corresponding to the one phase is an L-phase voltage detection pulse. In other embodiments, the method for identifying the phase and the station area of the multi-phase of the phase a, the phase B, and the phase C, which are output from the node electrically connected to the output end of the transformer, is consistent with the principle of the method of one phase, and will not be described herein. In other embodiments, the output end of the transformer may be other number of phase lines besides three-phase four-wire, and the spirit of the present invention is also applicable to this application scenario, which will not be described herein.
Between step S2 and step S3: and broadcasting the information of the voltage detection pulse corresponding to each phase voltage of the main node and the station area number to the slave node. In one embodiment, the master node designates certain slave nodes as proxy nodes, which send information of voltage detection pulses and cell numbers to other slave nodes.
And step S3, judging the phase position and the station area of the slave node based on the voltage detection pulse corresponding to the phase voltage of the slave node and the voltage detection pulse corresponding to the phase voltage of each phase of the master node.
In this embodiment, the master node transmits information of the voltage detection pulse corresponding to the phase voltage of each phase of the master node to the slave node, and the slave node determines the phase and the station area to which the slave node belongs based on the voltage detection pulse corresponding to the phase voltage to which the slave node belongs and the voltage detection pulse corresponding to the phase voltage of each phase of the master node.
Specifically, step S3 includes:
the method comprises the steps of S31, judging the phase position of the slave node and the station area of the slave node according to the period of the voltage detection pulse corresponding to the phase voltage of the slave node and the period of the voltage detection pulse corresponding to the phase voltage of each phase of the master node, and S32.
Step S31 specifically includes: subtracting the periods of the adjacent voltage detection pulses corresponding to the phase voltage of the slave node to obtain the period variation of the adjacent voltage detection pulses corresponding to the phase voltage of the slave node; and subtracting the periods of the adjacent voltage detection pulses corresponding to the phase voltages of the main node to obtain the period variation of the adjacent voltage detection pulses corresponding to the phase voltages of the main node.
The amount of change in the period of the adjacent voltage detection pulses corresponding to the phase voltage to which the slave node belongs is represented by dTL [ N ], the amount of change in the period of the adjacent voltage detection pulses corresponding to the phase voltage of each of the master nodes is three, and the amount of change in the period of the corresponding a-phase voltage detection pulse is represented by dTA [ N ], the amount of change in the period of the corresponding B-phase voltage detection pulse is represented by dTB [ N ], and the amount of change in the period of the corresponding C-phase voltage detection pulse is represented by dTC [ N ].
Step S32 specifically includes: and judging the phase and the distribution area of the slave node according to the period variation of the adjacent voltage detection pulse corresponding to the phase voltage of the slave node and the period variation of the adjacent voltage detection pulse corresponding to the phase voltage of each phase of the master node.
More specifically, step S32 includes:
step S321, comparing the period variation of the adjacent voltage detection pulse corresponding to the phase voltage of the slave node with a positive bias threshold VT1 and a negative bias threshold VT2 respectively; the amount of cycle change of the adjacent voltage detection pulses corresponding to the phase voltages of the main node is compared with the positive bias threshold VT1 and the negative bias threshold VT2, respectively. In a preferred embodiment, step S321 is: comparing the cycle variation of the adjacent voltage detection pulse of the phase voltage belonging to the node with a positive bias threshold VT1 and a negative bias threshold VT2 respectively for a plurality of times; comparing the cycle variation of adjacent voltage detection pulses of each phase voltage of the main node with a positive bias threshold VT1 and a negative bias threshold VT2 for multiple times; the comparison results are input to accumulators corresponding to the phases of the master node, respectively, a plurality of times. Through multiple comparisons, the influence of abnormal fluctuation of phase voltage can be eliminated, the accuracy of identification of the user variable relationship is improved, and the misjudgment rate of the user variable relationship is further reduced.
In step S322, the comparison results are inputted into the accumulators corresponding to the phases of the main node.
It should be noted that there are three accumulators corresponding to each phase of the master node, which are the accumulator SumA corresponding to the phase of the master node a, the accumulator SumB corresponding to the phase of the master node B, and the accumulator SumC corresponding to the phase of the master node C.
Step S322 specifically includes adding one to the accumulator corresponding to the phase of the master node if the period variation of the adjacent voltage detection pulse of the phase voltage to which the slave node belongs and the period variation of the adjacent voltage detection pulse of the phase voltage of the master node are both greater than the positive offset threshold VT 1.
Namely, if: dTA [ N ] > VT1 and dTL [ N ] > VT1, then SumA = SumA + 1.
Or dTB [ N ] > VT1 and dTL [ N ] > VT1, then SumB = SumB + 1.
Or dTC [ N ] > VT1 and dTL [ N ] > VT1, then SumC = SumC + 1.
Or if the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node and the period variation of the adjacent voltage detection pulse of the phase voltage of the master node are both smaller than the negative bias threshold VT2, the accumulator corresponding to the phase of the master node is incremented by one.
Namely if: dTA [ N ] < VT2 and dTL [ N ] < VT2, then SumA = SumA + 1.
Or dTB [ N ] < VT2 and dTL [ N ] < VT2, then SumB = SumB + 1.
Or dTC [ N ] < VT2 and dTL [ N ] < VT2, then SumC = SumC + 1.
Or if the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node and the period variation of the adjacent voltage detection pulse of the phase voltage of the master node are both between the negative bias threshold VT2 and the positive bias threshold VT1, the accumulator corresponding to the phase of the master node is incremented by one.
Namely if:
VT2< dTA [ N ] < VT1 and VT2< dTL [ N ] < VT1, then SumA = SumA + 1.
Or VT2< dTB [ N ] < VT1 and VT2< dTL [ N ] < VT1, then SumB = SumB + 1.
Or VT2< dTC [ N ] < VT1 and VT2< dTL [ N ] < VT1, then SumC = SumC + 1.
Or if the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node is larger than the positive bias threshold VT1 and the period variation of the adjacent voltage detection pulse of a certain phase voltage of the master node is smaller than the negative bias threshold VT2, the accumulator corresponding to the phase of the master node is reduced by one.
Namely if: dTA [ N ] > VT1 and dTL [ N ] < VT2, then SumA = SumA-1.
Or dTB [ N ] > VT1 and dTL [ N ] < VT2, then SumB = SumB-1.
Or dTC [ N ] > VT1 and dTL [ N ] < VT2, then SumC = SumC-1.
Or if the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node is smaller than the negative bias threshold VT2 and the period variation of the adjacent voltage detection pulse of the phase voltage of the master node is larger than the positive bias threshold VT1, the accumulator corresponding to the phase of the master node is reduced by one.
Namely if: dTA [ N ] < VT2 and dTL [ N ] > VT1, then SumA = SumA-1.
dTB [ N ] < VT2 and dTL [ N ] > VT1, then SumB = SumB-1.
dTC [ N ] < VT2 and dTL [ N ] > VT1, then SumC = SumC-1.
Other cases, then SumA = SumA or SumB = SumB or SumC = SumC.
Step S323: if the result of the accumulator corresponding to a certain phase of the main node is larger than a preset phase threshold value R, judging that the certain phase of the main node is the phase of the corresponding slave node, and the distribution area is the distribution area of the corresponding slave node; or if the result of the accumulator corresponding to each phase of the main node is smaller than the preset phase threshold value R, judging that the corresponding slave node does not belong to the distribution area.
That is, based on the above step S322, the sizes of SumA, SumB, SumC and R are compared. If SumA > R, the user of the slave node belongs to phase A and belongs to the station area. If SumB > R, then the user of the slave node belongs to phase B and belongs to the station area. If SumC > R, the user of the slave node belongs to C phase and belongs to the station area. If SumA < R and SumB < R and SumC < R, then it is indicated that the slave node does not belong to any phase A, B, C of the station, i.e., does not belong to the station. If SumA = R, SumB = R, and SumC = R, the case where the slave node is specified is another case, or any of A, B, C phases where the slave node does not belong to the station area, that is, does not belong to the station area. It should be noted that the station area is marked by a station area number corresponding to the station area.
The method further includes feeding back information of the phase and the cell area of the slave node to the master node after step S3.
Because the slave node judges the phase of the slave node and whether the slave node belongs to the station area, the judgment result is fed back to the master node when necessary.
The method also comprises the step of feeding back information of the affiliated phase and the affiliated station area of the slave node to the background system after the step S3.
The background system is electrically connected with the master node and is used for communicating with the master node to manage the master node, the slave nodes and the power supply and distribution network formed by the master nodes and the slave nodes.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method for identifying a phase and a station to which a subscriber belongs, the station including a master node and a slave node electrically connected to the master node, the master node including a polyphase voltage, the slave node including a subscriber, the method comprising:
s1, sending a voltage detection starting command;
s2, generating voltage detection pulses corresponding to each phase voltage of the master node and voltage detection pulses corresponding to the phase voltage of the slave node based on the voltage peak value fluctuation and the zero crossing point phase jitter;
s3, judging the phase position and the station area of the slave node based on the voltage detection pulse corresponding to the phase voltage of the slave node and the voltage detection pulse corresponding to the phase voltage of each phase of the master node;
the S3 includes: judging to obtain the phase of the slave node and the station area of the slave node based on the period of the voltage detection pulse corresponding to the phase voltage of the slave node and the period of the voltage detection pulse corresponding to the phase voltage of each phase of the master node;
the step of judging the phase and the region to which the slave node belongs based on the period of the voltage detection pulse corresponding to the phase voltage to which the slave node belongs and the period of the voltage detection pulse corresponding to the phase voltage of each phase of the master node comprises the following steps:
subtracting the periods of the adjacent voltage detection pulses corresponding to the phase voltage of the slave node to obtain the period variation of the adjacent voltage detection pulses corresponding to the phase voltage of the slave node;
subtracting the periods of the adjacent voltage detection pulses corresponding to the phase voltages of the main node to obtain the period variation of the adjacent voltage detection pulses corresponding to the phase voltages of the main node;
and judging the phase and the distribution area of the slave node according to the period variation of the adjacent voltage detection pulse corresponding to the phase voltage of the slave node and the period variation of the adjacent voltage detection pulse corresponding to the phase voltage of each phase of the master node.
2. The method for identifying the phase and the cell to which the user belongs according to claim 1, wherein the S2 includes:
detecting each phase voltage near a zero crossing point of each phase voltage of the main node, and generating a voltage detection pulse corresponding to each phase voltage of the main node when each phase voltage reaches a threshold value VT;
the phase voltage of the phase to which the slave node belongs is detected in the vicinity of a zero crossing point of the phase voltage, and a voltage detection pulse corresponding to the phase voltage of the phase to which the slave node belongs is generated when the phase voltage of the phase to which the slave node belongs reaches a threshold value VT.
3. The method as claimed in claim 1, wherein the determining the phase and the zone to which the slave node belongs according to the period variation of the adjacent voltage detection pulse corresponding to the phase voltage to which the slave node belongs and the period variation of the adjacent voltage detection pulse corresponding to the phase voltage of the master node comprises:
comparing the period variation of the adjacent voltage detection pulse corresponding to the phase voltage to which the slave node belongs with a positive bias threshold VT1 and a negative bias threshold VT2, respectively;
comparing the cycle variation of the adjacent voltage detection pulse corresponding to each phase voltage of the main node with a positive bias threshold VT1 and a negative bias threshold VT2 respectively;
inputting the comparison result into the accumulator corresponding to each phase of the main node;
if the result of the accumulator corresponding to a certain phase of the main node is larger than a preset phase threshold value, judging that the certain phase of the main node is the phase to which the corresponding slave node belongs, and the station area is the station area to which the corresponding slave node belongs; or
And if the result of the accumulator corresponding to each phase of the main node is smaller than the preset phase threshold, judging that the corresponding slave node does not belong to the distribution area.
4. A method for identifying a phase and a cell to which a subscriber belongs as claimed in claim 3, wherein said inputting the comparison result into the accumulator corresponding to the phase of each phase of the master node respectively further comprises:
if the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node and the period variation of the adjacent voltage detection pulse of the certain phase voltage of the master node are both greater than the positive bias threshold VT1, adding one to the accumulator corresponding to the phase of the master node; or
If the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node and the period variation of the adjacent voltage detection pulse of the phase voltage of the master node are both smaller than the negative bias threshold VT2, adding one to the accumulator corresponding to the phase of the master node; or
If the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node and the period variation of the adjacent voltage detection pulse of the phase voltage of the master node are both between the negative bias threshold VT2 and the positive bias threshold VT1, adding one to the accumulator corresponding to the phase of the master node; or
If the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node is larger than a positive bias threshold VT1 and the period variation of the adjacent voltage detection pulse of a certain phase voltage of the master node is smaller than a negative bias threshold VT2, subtracting one from the accumulator corresponding to the phase voltage of the master node; or
If the period variation of the adjacent voltage detection pulse of the phase voltage of the slave node is less than the negative bias threshold VT2 and the period variation of the adjacent voltage detection pulse of the phase voltage of the master node is greater than the positive bias threshold VT1, the accumulator corresponding to the phase of the master node is decremented by one.
5. The method for identifying the phase and the station area belonging to the user as claimed in claim 4, wherein the period variation of the adjacent voltage detection pulse of the phase voltage belonging to the slave node is compared with a positive bias threshold VT1 and a negative bias threshold VT 2; comparing the cycle variation of adjacent voltage detection pulses of each phase voltage of the main node with a positive bias threshold VT1 and a negative bias threshold VT2 respectively; inputting the comparison results into the accumulators corresponding to the phases of the main node respectively comprises: comparing the cycle variation of the adjacent voltage detection pulse of the phase voltage belonging to the node with a positive bias threshold VT1 and a negative bias threshold VT2 respectively for a plurality of times; comparing the cycle variation of adjacent voltage detection pulses of each phase voltage of the main node with a positive bias threshold VT1 and a negative bias threshold VT2 for multiple times; the comparison results are input to accumulators corresponding to the phases of the master node, respectively, a plurality of times.
6. The method for identifying the phase and the cell to which the subscriber belongs as claimed in claim 1, further comprising between S2 and S3: and sending the information of the voltage detection pulse of each phase voltage of the main node and the station area number to the slave node.
7. The method for identifying the phase and the station area to which the user belongs according to claim 6, further comprising feeding back information of the phase and the station area to which the slave node belongs to the master node after S3.
8. The method for identifying the phase and the station area to which the user belongs according to claim 7, further comprising feeding back information of the phase and the station area to which the slave node belongs to the background system after S3.
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