A device and method for determining the relative position of power users in a transformer area

Abstract

The application discloses a device and method for judging relative positions of power users in a power distribution area, which is applied to a power distribution area including at least two user power meters, wherein the device includes a high-frequency signal module and a direction judging module; the high-frequency signal module is installed in the user power meter, and a direction judging module is arranged at the upper end and the lower end of each user power meter and a T-connection branch respectively; the high-frequency signal module transmits or receives high-frequency signals to generate high-frequency resonance; the direction judging module monitors the power frequency active power flow direction and the high-frequency active power flow direction at the installation position, and judges the relative position relationship between any two user power meters in the power distribution area according to the relationship between the power frequency active power flow direction and the high-frequency active power flow direction. The application judges the relative position relationship between any two user power meters by comparing the direction relationship between the power frequency active power flow and the high-frequency active power flow, so that the relative positions of all user power meters in the power distribution area are obtained, and the effectiveness and accuracy are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of position discrimination, in particular to a device and method for discriminating relative positions of power users in a power distribution area. BACKGROUND

[0002] The determination of the relative positions of power users in a low-voltage power distribution area is of great significance to the topology identification, line loss management, low-voltage management, fault detection and positioning of the low-voltage power distribution area.

[0003] The common methods for discriminating the relative positions of power users in a low-voltage power distribution area currently mainly include the artificial power-off investigation method, the carrier communication method and the voltage amplitude comparison method. Among them, the artificial power-off investigation method is time-consuming and labor-intensive, has a high cost, and has a low investigation result accuracy; the carrier communication method is greatly affected by the cross talk of the power distribution area, and the signal attenuates with the increase of the distance, so the investigation result accuracy is low; the voltage amplitude comparison method determines the relative positions of the electric energy meters by comparing the voltage amplitudes of each user electric meter, but for a power distribution area with a large number of low-voltage distributed photovoltaic access, this method will make an incorrect discrimination of the user electric meters, and the investigation accuracy is low.

[0004] With a large number of low-voltage distributed photovoltaic access, the conventional method for discriminating the relative positions of power users in a low-voltage power distribution area may have more limitations due to the influence of the distributed photovoltaic access. SUMMARY

[0005] The purpose of the present application is to provide a device and method for discriminating the relative positions of power users in a power distribution area, so as to solve the technical problem of low accuracy in determining the relative positions of power users in a low-voltage power distribution area in the prior art.

[0006] The purpose of the present application can be achieved by the following technical solutions:

[0007] A device for discriminating the relative positions of power users in a power distribution area, applied to a power distribution area, wherein the power distribution area comprises at least two user electric meters, and the device comprises:

[0008] a high-frequency signal module and a direction discrimination module, wherein the high-frequency signal module is installed in the user electric meter, and one direction discrimination module is arranged at the upper end and the lower end of each user electric meter and a power supply branch T joint respectively;

[0009] wherein the high-frequency signal module emits or receives high-frequency signals to generate high-frequency resonance;

[0010] the direction discrimination module monitors the power frequency active power flow direction and the high-frequency active power flow direction at the installation position, and discriminates the relative position relationship between any two user electric meters in the power distribution area according to the relationship between the power frequency active power flow direction and the high-frequency active power flow direction.

[0011] Optionally, the high-frequency signal module is installed in the user electricity meter, comprising:

[0012] The high-frequency signal module is installed in the user electricity meter in a manner of injecting and receiving high-frequency signals.

[0013] The application also provides a method for determining the relative positions of power users in a power distribution area, which comprises the following steps:

[0014] When the active power flow direction of the power frequency is positive, a first user electricity meter of any two user electricity meters transmits a high-frequency signal, and a second user electricity meter receives the high-frequency signal to generate a high-frequency resonance. A second direction determination module compares the active power flow direction of the power frequency and the active power flow direction of the high frequency to obtain a first determination result. The second direction determination module is installed at the upper end of the T-junction of the power supply branch connected to the second user electricity meter.

[0015] The second user electricity meter transmits a high-frequency signal, and the first user electricity meter receives the high-frequency signal to generate a high-frequency resonance. A first direction determination module compares the active power flow direction of the power frequency and the active power flow direction of the high frequency to obtain a second determination result. The first direction determination module is installed at the lower end of the T-junction of the power supply branch connected to the first user electricity meter.

[0016] The relative position relationship between the first user electricity meter and the second user electricity meter is determined according to the first determination result and the second determination result.

[0017] The above steps are repeatedly executed until the relative position relationship between all user electricity meters in the power distribution area is determined, thereby obtaining the relative positions of all power users.

[0018] Optionally, the second direction determination module compares the active power flow direction of the power frequency and the active power flow direction of the high frequency to obtain a first determination result, comprising:

[0019] When the second direction determination module determines that the active power flow direction of the power frequency and the active power flow direction of the high frequency are opposite, the first user electricity meter and the second user electricity meter are located on the same power supply branch line, and the first user electricity meter is located downstream of the second user electricity meter.

[0020] When the second direction determination module determines that the active power flow direction of the power frequency and the active power flow direction of the high frequency are the same, the subsequent steps are continued.

[0021] Optionally, the first direction determination module compares the active power flow direction of the power frequency and the active power flow direction of the high frequency to obtain a second determination result, comprising:

[0022] when the first direction judging module judges that the power frequency active power flow direction and the high frequency active power flow direction are opposite, the first user electric meter and the second user electric meter are located on the same power supply branch line and the first user electric meter is located upstream of the second user electric meter;

[0023] when the first direction judging module judges that the power frequency active power flow direction and the high frequency active power flow direction are the same, the first user electric meter and the second user electric meter are located on different power supply branch lines.

[0024] Optionally, the relative position relationship of the first user electric meter and the second user electric meter comprises:

[0025] the first user electric meter and the second user electric meter are located on the same power supply branch line and the first user electric meter is located downstream of the second user electric meter; or

[0026] the first user electric meter and the second user electric meter are located on the same power supply branch line and the first user electric meter is located upstream of the second user electric meter; or

[0027] the first user electric meter and the second user electric meter are located on different power supply branch lines.

[0028] Optionally, when the power frequency active power flow direction is positive, the first user electric meter in any two user electric meters emits a high frequency signal, and the second user electric meter receives the high frequency signal before high frequency resonance is generated, and further comprising:

[0029] receiving a relative position discrimination instruction issued by a master station, judging whether the power frequency active power flow direction monitored by the measurement terminal is positive, and if not, returning to the master station and waiting for the relative position discrimination instruction to be issued again.

[0030] Optionally, when the low-voltage distributed photovoltaic equipment is accessed in the power distribution area, the relative position relationship between any two user electric meters is judged in the evening period when the photovoltaic stops power generation.

[0031] Optionally, the evening period when the photovoltaic stops power generation is from 19:00 to 21:00.

[0032] The application provides a device and method for judging relative positions of power users in a power distribution area, which is applied to a power distribution area, and the power distribution area comprises at least two user power meters, the device comprises: a high-frequency signal module and a direction judging module, the high-frequency signal module is installed in the user power meter, and one direction judging module is arranged at the upper end and the lower end of each user power meter and a T-connection branch, wherein the high-frequency signal module transmits or receives high-frequency signals to generate high-frequency resonance; the direction judging module monitors the power frequency active power flow direction and the high-frequency active power flow direction at the installation position, and judges the relative position relationship between any two user power meters in the power distribution area according to the relationship between the power frequency active power flow direction and the high-frequency active power flow direction.

[0033] Therefore, the application has the following beneficial effects:

[0034] The application extends the high-frequency signal module in the intelligent user power meter, transmits or receives high-frequency signals to generate high-frequency resonance in the power line; the direction judging module is arranged at the upper end and the lower end of the T-connection branch between the user power meter and the power supply branch, and the direction relationship between the high-frequency active power flow and the power frequency active power flow is analyzed by the direction judging module, so that the upstream and downstream position relationship between any two user power meters can be judged, and the branch line belonging relationship of any two user power meters can also be judged. The application compares the direction relationship between the power frequency active power flow and the high-frequency active power flow by the direction judging module, so that the effectiveness and accuracy of the relative position of the power user are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 Fig. 1 is a structural schematic diagram of the device of the application;

[0036] Figure 2 Fig. 2 is a comparison schematic diagram of the power frequency active power flow and the high-frequency active power flow of the application;

[0037] Figure 3 Fig. 3 is a flow schematic diagram of the method of the application;

[0038] Figure 4 Fig. 4 is a flow schematic diagram of the relative position judging method of the embodiment of the application. DETAILED DESCRIPTION

[0039] TERMS EXPLANATION

[0040] Electric energy meter: also called user power meter, a device for measuring electric energy of a user, which can collect various electric energy data.

[0041] Active power flow: active power distribution when the power grid is in steady state operation.

[0042] High-frequency current signal: a small current signal with very small amplitude (milliampere level) and very high frequency (f>>50Hz).

[0043] Resonant circuit: the inductive reactance and the capacitive reactance in the circuit are equal in size, which is divided into series resonance and parallel resonance, series resonance refers to that the inductive reactance and the capacitive reactance are connected in series, the inductive reactance and the capacitive reactance cancel each other out, the reactance value is zero, and the circuit is equivalent to a short circuit; parallel resonance refers to that the inductive reactance and the capacitive reactance are connected in parallel, the impedance of the inductive reactance and the capacitive reactance in parallel is infinite, and the circuit is equivalent to an open circuit.

[0044] Direction discrimination module: capable of detecting the power direction flowing through the module.

[0045] For the purpose of facilitating the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided for the purpose of making the disclosure of the present application more thorough and comprehensive.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0047] The embodiment of the present application provides a device and method for determining the relative positions of power users in a low-voltage distribution area.

[0048] In the common method for determining the relative positions of power users, the artificial power-off investigation method determines the relative positions of power users in a low-voltage distribution area by powering off each branch switch at each level of the low-voltage distribution area, determining the branch line to which each user meter belongs, and then determining the relative positions of the user meters. However, this method can only determine the relative positions of the branch switches, and cannot determine the relative positions of the user meters under the branch switches, that is, the accuracy of the determination is low. Moreover, this method requires a large amount of manpower, consumes a lot of time and effort, and is not conducive to the rapid identification of the relative positions of power users in a low-voltage distribution area.

[0049] The carrier communication method installs a carrier signal generation module in a concentrator and installs a signal receiving module in a user meter, determines the distance between the user meter and the concentrator by using the time difference between signal generation and reception, and then determines the relative positions of all user meters. Since the carrier signal is greatly affected by the crosstalk between the distribution areas, and the signal attenuates with increasing distance, the accuracy of the investigation result is low.

[0050] The voltage amplitude ratio method is based on the mechanism that the voltage amplitude decreases from the head to the tail in the single-sided power supply radial distribution network to determine the relative positions of the user meters in the transformer area. The method can effectively arrange the upstream and downstream relationships of the user meters in most transformer areas. However, for a large number of low-voltage transformer areas with distributed photovoltaic access, the voltage amplitude of the downstream user meter is higher than that of the upstream user meter. In this case, the method cannot give the correct relative position relationship of the user meters, resulting in a significant reduction in the accuracy of the troubleshooting results.

[0051] The disadvantages of the above prior art mainly include:

[0052] (1) The accuracy cannot be guaranteed. The manual power-off troubleshooting method has low accuracy and can only determine the relative positions of the branch switches. The carrier communication method and the voltage amplitude ratio method have low accuracy and are affected by signal crosstalk in the transformer area and distributed photovoltaic access, resulting in incorrect judgments.

[0053] (2) The application scenarios are limited. The manual power-off troubleshooting method affects normal power supply and has high labor costs. The carrier communication method is suitable for transformer areas with small power supply radii, and the voltage amplitude ratio method is only suitable for radial distribution networks without distributed power access.

[0054] Please refer to Figure 1 The application provides a device for determining the relative positions of user meters in a transformer area.

[0055] A high-frequency signal module and a direction determination module, the high-frequency signal module is installed in the user meter, and a direction determination module is arranged at the upper and lower ends of each user meter and the power supply branch T connection branch.

[0056] The high-frequency signal module transmits or receives high-frequency signals to generate high-frequency resonance.

[0057] The direction determination module monitors the power frequency active power flow direction and the high-frequency active power flow direction at the installation site, and determines the relative position relationship between any two user meters in the transformer area according to the relationship between the power frequency active power flow direction and the high-frequency active power flow direction.

[0058] In the embodiment of the application, the transformer area includes at least two user meters, and a high-frequency signal module is installed in each user meter. The two user meters are referred to as a first user meter and a second user meter. It should be noted that the first user meter refers to one of the two user meters, and the second user meter refers to the other user meter.

[0059] As Figure 1As shown, from left to right, these are the branch lines of the main power supply line for the transformer area, A. 11 A 12 A 1n A 21 A 22 A 2n A m1 A m2 A mn For each branch line's user smart meter, a high-frequency signal module is installed inside. The smart meter can be considered equivalent to a series circuit of the meter's own impedance and a high-frequency signal generation circuit. The high-frequency signal module is installed in the user meter by injecting and receiving high-frequency signals. It should be noted that the high-frequency signal can be a high-frequency current signal, a high-frequency voltage signal, or other high-frequency signals.

[0060] Understandably, the first power supply branch line includes A. 11 A 12 A 1n These n smart user meters, A 11 In A 12 A 1n Upstream of these users' electricity meters, A 12 In A 11 Downstream of A 13 A 1n These are upstream of the users' electricity meters. Similarly, the second power supply branch line includes A. 21 A 22 A 2n These n smart user meters.

[0061] In this embodiment, a direction determination module is configured at the upper and lower ends of each smart user meter and the T-junction of the connected power supply branch, such as... Figure 1 As shown, c 11u c 11d c 12u c 12d c 1nd c m1u c m1d c m2u c m2d ..., c mnd This is a direction determination module, capable of monitoring the direction of power frequency and high frequency active power flow at the installation node. For example, in smart user meter A... 11 The direction detection modules configured at the upper and lower ends of the T-connection of the power supply branch are c. 11u c 11d .by Figure 1 Taking the three user meters in the dashed box as an example, let's select one of the meters, A.pi As a high-frequency signal transmitter, the high-frequency current signal is transmitted by the high-frequency signal module. The high-frequency current signal is extremely small and superimposed in the power frequency signal, which does not affect the normal operation of the circuit. The electric meter A pj and A qj As a high-frequency signal receiver, the high-frequency signal module is set to resonate with the user's electric meter itself, and the high-frequency equivalent impedance is zero. The user's electric meter is equivalent to a wire. Then, the user's electric meter A pj and A qj As a high-frequency signal transmitter, the user's electric meter A pi As a high-frequency signal receiver, the direction relationship between the power frequency active power flow and the high-frequency active power flow monitored by the two rounds of the direction determination module is determined to determine the relative position relationship of the electric meter A pi , A pj and A qj The specific determination method is shown in Figure 2 .

[0062] It should be noted that the user's electric meter A pj and A qj resonate with itself, which allows the high-frequency current signal to flow through the user's electric meter as much as possible, thereby enhancing the signal receiving strength of the user's electric meter and the accuracy of the direction determination module.

[0063] As shown in Figure 2 , P is the power frequency active power flow monitored by each direction determination module, and the direction is from the transformer outlet to the user's electric meter. P h<pi,pj> is the high-frequency active power flow monitored by the direction determination module c pju , which is transmitted by the user's electric meter A pi and received by the user's electric meter A pj , the direction is from the high-frequency signal transmitting end electric meter to the high-frequency signal receiving end electric meter, and so on. P h<pj,pi> , P h<qi,pi> , P h<pi,qj> are the high-frequency active power flows monitored by the direction determination modules at different electric meters.

[0064] If two user's electric meters are under the same power supply branch, taking the user's electric meter A pi and A pj in Figure 2 as an example, when the user's electric meter A pi acts as a high-frequency signal transmitter and the user's electric meter A pj acts as a high-frequency signal receiver, the direction of the power frequency active power flow monitored by the direction determination module c pju is the same as that of the high-frequency active power flow. When the user's electric meter A pj acts as a high-frequency signal transmitter and the user's electric meter A piWhen used as a high-frequency signal receiver, the direction determination module c pid The monitored power frequency active power flow is in the opposite direction to the high frequency active power flow, and user meter A pi Located at A pj Upstream location.

[0065] It should be noted that when assuming two user meters are on the same branch line, the direction of the power frequency active power flow is fixed (it must flow from upstream to downstream). User meter A... pi and A pj Since they take turns acting as both high-frequency signal transmitters and receivers, it is only necessary to determine the direction of the receiver by using module c. pid and c pju The direction determination module c pid and c pju By comparing the directions of the monitored power frequency active power flow and the high frequency active power flow, the direction of user meter A can be determined. pi and A pj The relative positional relationship.

[0066] If the two users' electricity meters are on different branch lines, Figure 2 Medium-sized user electricity meter A pi and A qj For example, when user meter A pi As a high-frequency signal transmitter and user meter A qj When used as a high-frequency signal receiver, the direction determination module c qju The monitored power frequency active power flow and high frequency active power flow are in the same direction; when user meter A qj As a high-frequency signal transmitter and user meter A pi When used as a high-frequency signal receiver, the direction determination module c piu The monitored power frequency active power flow and high frequency active power flow are in the same direction.

[0067] Please see Figure 3 The present invention also provides an embodiment of a method for determining the relative location of power users in a distribution transformer area, applicable to a distribution transformer area, the method comprising the following steps:

[0068] S100: When the power frequency active power flow direction is positive, the first user meter of any two user meters transmits a high frequency signal, and the second user meter receives the high frequency signal and generates a high frequency resonance. The second direction discrimination module compares the power frequency active power flow direction and the high frequency active power flow direction to obtain a first discrimination result. The second direction discrimination module is installed at the upper end of the second user meter and the T-junction of the connected power supply branch.

[0069] S200: selecting the second user meter to emit a high-frequency signal, the first user meter receiving the high-frequency signal to generate high-frequency resonance, the first direction discrimination module comparing the power frequency active power flow direction and the high-frequency active power flow direction to obtain a second discrimination result, and the first direction discrimination module being installed at the lower end of the T-junction of the first user meter and the connected power supply branch;

[0070] S300: determining the relative position relationship of the first user meter and the second user meter according to the first discrimination result and the second discrimination result;

[0071] S400: repeatedly performing the above steps until the relative position relationship between all the user meters in the distribution area is determined, so as to obtain the relative positions of all the power users.

[0072] Before step S100 is performed, the main station issues a discrimination instruction of the relative positions of the user meters, the measurement terminal monitors the power frequency active power flow direction, if the monitored power frequency active power flow is reverse, the main station is returned, and the discrimination instruction of the relative positions is issued again by the main station; if the monitored power frequency active power flow is forward, step S100 is performed.

[0073] In step S100 of the embodiment, when the power frequency active power flow direction is forward, a first user meter in any two user meters is selected to emit a high-frequency signal, a second user meter receives the high-frequency signal to generate high-frequency resonance, a second direction discrimination module is installed at the upper end of the T-junction of the second user meter and the connected power supply branch, the second direction discrimination module compares the power frequency active power flow direction and the high-frequency active power flow direction to obtain a first discrimination result, including:

[0074] When the second direction discrimination module judges that the power frequency active power flow direction and the high-frequency active power flow direction are opposite, the first user meter and the second user meter are located on the same power supply branch line, and the first user meter is located downstream of the second user meter; when the second direction discrimination module judges that the power frequency active power flow direction and the high-frequency active power flow direction are the same, the following steps are continuously performed.

[0075] In step S200 of the embodiment, the second user meter is selected to emit a high-frequency signal, the first user meter receives the high-frequency signal to generate high-frequency resonance, a first direction discrimination module is installed at the lower end of the T-junction of the first user meter and the connected power supply branch, and the first direction discrimination module compares the power frequency active power flow direction and the high-frequency active power flow direction to obtain a second discrimination result, including:

[0076] When the first direction discrimination module judges that the power frequency active power flow direction and the high frequency active power flow direction are opposite, then the first user electric meter and the second user electric meter are located on the same power supply branch line and the first user electric meter is located upstream of the second user electric meter; when the first direction discrimination module judges that the power frequency active power flow direction and the high frequency active power flow direction are the same, then the first user electric meter and the second user electric meter are located on different power supply branch lines.

[0077] In step S300, the relative position relationship of the first user electric meter and the second user electric meter is determined according to the first discrimination result and the second discrimination result.

[0078] It can be understood that the relative position relationship of any two user electric meters, i.e. the first user electric meter and the second user electric meter, includes the following three cases:

[0079] (1) the first user electric meter and the second user electric meter are located on the same power supply branch line and the first user electric meter is located downstream of the second user electric meter;

[0080] (2) the first user electric meter and the second user electric meter are located on the same power supply branch line and the first user electric meter is located upstream of the second user electric meter;

[0081] (3) the first user electric meter and the second user electric meter are located on different power supply branch lines.

[0082] The method for discriminating the relative position of the power users in the transformer area provided in the embodiment expands the high frequency signal module in the intelligent user electric meter, injects or receives the high frequency signal to produce high frequency resonance in the power line; the direction discrimination module is arranged at the upper and lower ends of the user electric meter T joint, the direction relationship of the high frequency active power flow and the power frequency active power flow is analyzed through the direction discrimination module, not only the upstream and downstream position relationship between any two user electric meters can be judged, but also the branch line belonging relationship of any two user electric meters can be judged. The direction discrimination module compares the direction relationship of the power frequency active power flow and the high frequency active power flow, which guarantees the effectiveness and accuracy of the relative position of the power users.

[0083] Please refer to Figure 4 Another embodiment of the method for discriminating the relative position of the power users in the transformer area provided in the embodiment discriminates the relative position of the power users in the transformer area based on the comparison of the active power flow directions under different frequencies, which can realize the sorting and dynamic updating of the branch line relationship and the upstream and downstream relative position relationship of the transformer area electric meters, and the specific process is as follows:

[0084] (1) The master station sends a judgment command on the relative position of the user's electricity meter. The measurement terminal monitors the direction of the power frequency active power flow. If the direction of the power frequency active power flow is reversed, it returns to the master station and waits for the master station to send the relative position judgment command again. If the direction of the power frequency active power flow is positive, it continues to execute the relative position judgment process.

[0085] (2) Select two smart user meters X and Y, and distinguish between the first user meter X and the second user meter Y. First, use the first user meter X as the high-frequency signal transmitter and the second user meter Y as the high-frequency signal receiver. The high-frequency signal module in smart meter Y causes the meter to resonate in series, which amplifies the high-frequency signal for easy detection. The direction discrimination module at the power supply branch T of the second user meter Y, i.e., the second direction discrimination module, compares the high-frequency active power flow direction cY with the power frequency active power flow direction cP. If cY and cP are in opposite directions, then the first user meter X and the second user meter Y are located on the same power supply branch and the first user meter X is downstream of the second user meter Y; if cY and cP are in the same direction, then continue to execute the discrimination process.

[0086] (3) Next, the second user meter Y is used as the high-frequency signal transmitter and the first user meter X is used as the high-frequency signal receiver. The signal module in the first user meter X causes the meter to resonate in series, which amplifies the high-frequency signal for easy detection. The direction discrimination module at the power supply branch T of the first user meter X, i.e. the first direction discrimination module, compares the high-frequency active power flow direction cX with the power frequency active power flow direction cP. If cX and cP are in opposite directions, then the first user meter X and the second user meter Y are located on the same power supply branch line and the first user meter X is located upstream of the second user meter Y; if cX and cP are in the same direction, then the first user meter X and the second user meter Y are located on different power supply branch lines.

[0087] (4) Return the judgment result to the measurement terminal, continue to select any two smart user meters, and repeat steps (2) and (3) until the relative position relationship between all user meters in the distribution area is determined. Finally, send the judgment result to the main station to sort out and judge the relative position of all power users in the distribution area.

[0088] This invention extends a high-frequency signal module into the smart user meter to inject or receive high-frequency signals into the power line to generate high-frequency resonance. Direction discrimination modules are set at the upper and lower ends of the T-junction of the user meter. The direction discrimination modules analyze the directional relationship between high-frequency active power flow and power frequency active power flow, and use several different relationship conditions to determine the relative position relationship between any two power users, thereby sorting out and determining the relative position of all power users in the distribution area.

[0089] The relative position discrimination method of the power users in the transformer area provided by the embodiment can not only determine the upstream and downstream position relationship between any two user electric meters, but also determine the branch line belonging relationship of any two user electric meters, and the direction discrimination module compares the direction relationship of the power frequency active power flow and the high frequency active power flow, thereby ensuring the effectiveness and accuracy of the relative position of the power users.

[0090] With the large access of low-voltage distributed photovoltaics, the conventional method for discriminating the relative position of low-voltage transformer area power users may have more limitations due to the influence of distributed photovoltaic access.

[0091] For the scenario where low-voltage distributed photovoltaic devices are accessed in the transformer area, although the phenomenon of photovoltaic grid-connected devices sending power to the upper-level power grid in reverse may occur, causing the direction of power frequency active power flow to change from the electric meter end to the transformer, but according to the direction of the active current monitored by the transformer area intelligent measurement terminal, the above principle discrimination can be performed when the photovoltaic stops outputting at night every day, ensuring that the direction of the power frequency active power flow is positive.

[0092] On the basis of the foregoing embodiment, when there are a large number of low-voltage distributed photovoltaic devices accessed in the distribution transformer area, the relative position relationship between any two user electric meters can be discriminated in the evening period when the photovoltaic stops outputting every day.

[0093] Based on the above principle, the relative position of the user electric meter is discriminated at 19:00-21:00 every day, and any two user electric meters are selected at each time, and two rounds of high-frequency signal transmission and reception processes are performed, wherein each user electric meter acts as both a high-frequency signal transmitter and a high-frequency signal receiver in the two rounds, until the relative position discrimination between all electric meters in the distribution transformer area is performed, i.e., the relative position relationship between all user electric meters is determined, and finally the relative position of all power users in the distribution transformer area can be identified through analysis and discrimination.

[0094] The present application aims to solve the problem that the relative position of the transformer area power users is difficult to accurately discriminate in the scenario where a large number of distributed photovoltaics are accessed in the low-voltage distribution network. The present application installs a high-frequency signal module in each user electric meter in the form of injecting and receiving signals, which can both transmit and receive high-frequency current signals to make the high-frequency equivalent impedance of the electric meter in series in the line zero. A direction discrimination module is installed at the upstream and downstream of the T-branch power supply main line of each user electric meter, which can monitor the direction of the power frequency active power flow and the high frequency active power flow at the installation node. One user electric meter is used as a high-frequency signal generator, and the other user electric meter is set to generate high-frequency resonance as a high-frequency signal receiver. The relative position relationship of the two user electric meters is determined by the direction relationship of the power frequency active power flow and the high frequency active power flow monitored by the direction discrimination module.

[0095] The method provided by the embodiment can be applied to a large number of distributed photovoltaic access low-voltage areas, and application scenarios are more abundant and application ranges are more extensive.

[0096] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the system, device and unit described above can refer to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0097] In the embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented by other manners. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or components shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0098] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, can be located in one place, or can be distributed on a plurality of network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment scheme.

[0099] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0100] When the integrated unit is realized in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or substantially or part of the technical solutions that make contributions to the prior art or the whole technical solutions can be stored in the form of a software product and can be sold or used as a stand-alone product.

[0101] The units or parts can be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the various embodiments of the present application. The aforementioned storage medium includes a variety of media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0102] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents. Such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for determining the relative location of power users in a distribution area, characterized in that, Applied to a distribution substation, the distribution substation including at least two user meters, the device includes: A high-frequency signal module and a direction determination module are provided. The high-frequency signal module is installed in the user meter, and a direction determination module is configured at the upper and lower ends of the junction of the user meter and the connected power supply branch T. The first direction determination module is installed at the lower end of the junction of the first user meter and the connected power supply branch T, and the second direction determination module is installed at the upper end of the junction of the second user meter and the connected power supply branch T. The high-frequency signal module transmits or receives high-frequency signals to generate high-frequency resonance. The direction discrimination module monitors the power frequency active power flow direction and the high frequency active power flow direction at the installation location, and determines the relative positional relationship between any two user meters in the distribution transformer area based on the relationship between the power frequency active power flow direction and the high frequency active power flow direction. The second direction discrimination module is used to compare the power frequency active power flow direction and the high frequency active power flow direction to obtain a first discrimination result when the power frequency active power flow direction is positive, and the first user meter emits a high frequency signal and the second user meter receives the high frequency signal and generates high frequency resonance. The first direction discrimination module is used to compare the power frequency active power flow direction and the high frequency active power flow direction to obtain a second discrimination result when the second user meter emits a high frequency signal and the first user meter receives the high frequency signal and generates high frequency resonance. The first discrimination result and the second discrimination result are used to determine the relative positional relationship between the first user meter and the second user meter, so as to obtain the relative position of all power users based on the relative positional relationship between all user meters in the distribution transformer area.

2. The device for determining the relative location of power users in a distribution area according to claim 1, characterized in that, The high-frequency signal module installed in the user's electricity meter includes: The high-frequency signal module is installed in the user's electricity meter in a manner that injects and receives high-frequency signals.

3. A method for determining the relative location of power users in a distribution area, characterized in that, Applied to a distribution radio area, the method includes the following steps: When the power frequency active power flow direction is positive, the first user meter of any two user meters transmits a high frequency signal, and the second user meter receives the high frequency signal and generates a high frequency resonance. The second direction discrimination module compares the power frequency active power flow direction and the high frequency active power flow direction to obtain the first discrimination result. The second direction discrimination module is installed at the upper end of the second user meter and the T-junction of the connected power supply branch. The second user meter is selected to transmit a high-frequency signal, and the first user meter receives the high-frequency signal and generates a high-frequency resonance. The first direction discrimination module compares the power frequency active power flow direction and the high-frequency active power flow direction to obtain a second discrimination result. The first direction discrimination module is installed at the lower end of the first user meter and the T-junction of the connected power supply branch. The relative positional relationship between the first user meter and the second user meter is determined based on the first discrimination result and the second discrimination result; Repeat the above steps until the relative positions of all the user meters in the distribution area are determined in pairs, thereby obtaining the relative positions of all power users.

4. The method for determining the relative location of power users in a distribution area according to claim 3, characterized in that, The second direction discrimination module compares the power frequency active power flow direction and the high frequency active power flow direction to obtain the first discrimination result, including: When the second direction discrimination module determines that the power frequency active power flow direction and the high frequency active power flow direction are opposite, the first user meter and the second user meter are located on the same power supply branch line and the first user meter is located downstream of the second user meter. When the second direction discrimination module determines that the power frequency active power flow direction and the high frequency active power flow direction are the same, the subsequent steps are executed.

5. The method for determining the relative location of power users in a distribution area according to claim 3, characterized in that, The first direction discrimination module compares the power frequency active power flow direction and the high frequency active power flow direction to obtain a second discrimination result, including: When the first direction discrimination module determines that the power frequency active power flow direction and the high frequency active power flow direction are opposite, the first user meter and the second user meter are located on the same power supply branch line and the first user meter is located upstream of the second user meter. When the first direction discrimination module determines that the power frequency active power flow direction and the high frequency active power flow direction are the same, the first user meter and the second user meter are located on different power supply branches.

6. The method for determining the relative location of power users in a distribution area according to claim 3, characterized in that, The relative positional relationship between the first user meter and the second user meter includes: The first user meter and the second user meter are located on the same power supply branch line, and the first user meter is located downstream of the second user meter; or The first user meter and the second user meter are located on the same power supply branch line, and the first user meter is located upstream of the second user meter; or The first user's electricity meter and the second user's electricity meter are located on different power supply branches.

7. The method for determining the relative location of power users in a distribution area according to any one of claims 4-6, characterized in that, When the power frequency active power flow direction is positive, before the first user meter of any two user meters transmits a high-frequency signal and the second user meter receives the high-frequency signal and generates high-frequency resonance, the process includes: Upon receiving the relative position determination command from the master station, the terminal determines whether the power frequency active power flow direction monitored by the measurement terminal is positive. If not, it returns to the master station and waits for the relative position determination command to be sent again.

8. The method for determining the relative location of power users in a distribution area according to claim 3, characterized in that, When low-voltage distributed photovoltaic equipment is connected to the distribution area, the relative positional relationship between any two user meters is determined during the evening period when the photovoltaic power output stops.

9. The method for determining the relative location of power users in a distribution area according to claim 8, characterized in that, The period during which photovoltaic power output stops is from 19:00 to 21:00.

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