CN115021268A - Device and method for distinguishing relative position of power consumer in transformer area - Google Patents
Device and method for distinguishing relative position of power consumer in transformer area Download PDFInfo
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- CN115021268A CN115021268A CN202210675480.6A CN202210675480A CN115021268A CN 115021268 A CN115021268 A CN 115021268A CN 202210675480 A CN202210675480 A CN 202210675480A CN 115021268 A CN115021268 A CN 115021268A
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
Abstract
The invention discloses a device and a method for distinguishing the relative position of power users in a distribution area, which are applied to the distribution area comprising at least two user electric meters, wherein the device comprises: the high-frequency signal module is arranged in the user electric meters, and the upper end and the lower end of each user electric meter and a T-connection line of the connected power supply branch are respectively provided with one direction distinguishing module; the high-frequency signal module transmits a high-frequency signal or receives the high-frequency signal to generate high-frequency resonance; the direction judging module monitors a power frequency active power flow direction and a high-frequency active power flow direction at the installation position, and judges the relative position relation of any two user electric meters in a power distribution area according to the relation between the power frequency active power flow direction and the high-frequency active power flow direction. The invention judges the relative position relation between any two user electric meters by comparing the direction relation of the power frequency active power flow and the high frequency active power flow, thereby obtaining the relative positions of all the user electric meters in the transformer area and ensuring the effectiveness and the accuracy.
Description
Technical Field
The invention relates to the technical field of position judgment, in particular to a device and a method for judging the relative position of power users in a distribution area.
Background
The determination of the relative position of the power users in the low-voltage distribution transformer area has very important significance on the problems of topology identification, line loss management, low-voltage management, fault detection and positioning and the like of the low-voltage distribution transformer area.
The current common method for judging the relative position of the power users in the low-voltage transformer area mainly comprises the following steps: a manual power failure checking method, a carrier communication method, a voltage amplitude comparison method and the like. The manual power failure checking method is time-consuming and labor-consuming, high in cost and low in accuracy of checking results; the carrier communication method is greatly influenced by the crosstalk of the station area, the signal is attenuated along with the increase of the distance, and the accuracy of the investigation result is low; the voltage amplitude comparison method determines the relative position of the electric energy meter by comparing the voltage amplitude of each user electric meter, but for a distribution area with a large number of low-voltage distributed photovoltaic accesses, the method can be used for carrying out error judgment on the user electric meters, and the checking accuracy is low.
With the massive access of low-voltage distributed photovoltaic, the conventional method for judging the relative position of power users in a low-voltage transformer area is influenced by the distributed photovoltaic access and may have more limitations.
Disclosure of Invention
The invention aims to provide a device and a method for judging the relative position of power users in a distribution area, which aim to solve the technical problem of low accuracy in determining the relative position of the power users in a low-voltage distribution area in the prior art.
The purpose of the invention can be realized by the following technical scheme:
a distinguishing device for the relative position of power users in a distribution area is applied to the distribution area, the distribution area comprises at least two user electric meters, and the device comprises:
the high-frequency signal module is installed in the user electric meters, and the direction distinguishing module is respectively configured at the upper end and the lower end of each user electric meter and a T-connection line of the connected power supply branch;
the high-frequency signal module transmits a high-frequency signal or receives the high-frequency signal to generate high-frequency resonance;
the direction judging module monitors a power frequency active power flow direction and a high-frequency active power flow direction at an installation position, and judges the relative position relation between any two user electric meters in a power distribution area according to the relation between the power frequency active power flow direction and the high-frequency active power flow direction.
Optionally, the installing the high frequency signal module in the user electricity meter comprises:
the high frequency signal module is installed in the consumer electric meter in a manner of injecting a high frequency signal and receiving a high frequency signal.
The invention also provides a method for judging the relative position of the power users in the distribution area, which is applied to the distribution area and comprises the following steps:
when the power frequency active power flow direction is the forward direction, a first user electric meter in any two user electric meters is selected to transmit a high-frequency signal, a second user electric meter receives the high-frequency signal to generate high-frequency resonance, the second direction distinguishing module compares the power frequency active power flow direction with the high-frequency active power flow direction to obtain a first distinguishing result, and the second direction distinguishing module is installed at the upper end of a T connection line of the second user electric meter and a connected power supply branch;
selecting the second user electric meter to transmit a high-frequency signal, receiving the high-frequency signal by the first user electric meter to generate high-frequency resonance, comparing a power frequency active power flow direction with a high-frequency active power flow direction by the first direction judging module to obtain a second judging result, and installing the first direction judging module at the lower end of a T connection line of the first user electric meter and the connected power supply branch;
determining the relative position relationship between the first user electric meter and the second user electric meter according to the first judgment result and the second judgment result;
and repeating the steps until the relative position relationship is determined between every two user electric meters in the power distribution area, so that the relative positions of all the power users are obtained.
Optionally, the comparing, by the second direction determination module, the power frequency active power flow direction and the high frequency active power flow direction to obtain a first determination result includes:
when the second direction judging module judges that the power frequency active power flow direction is opposite to the high frequency active power flow direction, the first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the downstream of the second user electric meter;
and when the second direction judging module judges that the power frequency active power flow direction is the same as the high-frequency active power flow direction, continuing to execute the following steps.
Optionally, the comparing, by the first direction determination module, the power frequency active power flow direction and the high frequency active power flow direction to obtain a second determination result includes:
when the first direction judging module judges that the power frequency active power flow direction is opposite to the high frequency active power flow direction, the first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the upstream of the second user electric meter;
and when the first direction judging module judges that the power frequency active power flow direction is the same as the high-frequency active power flow direction, the first user electric meter and the second user electric meter are positioned on different power supply branch lines.
Optionally, the relative position relationship between the first user electric meter and the second user electric meter includes:
the first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the downstream of the second user electric meter; or
The first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the upstream of the second user electric meter; or
The first user electric meter and the second user electric meter are located on different power supply branch lines.
Optionally, when the power frequency active power flow direction is a forward direction, selecting a first user electric meter of any two user electric meters to transmit a high-frequency signal, and before the second user electric meter receives the high-frequency signal and generates high-frequency resonance, the method further includes:
and receiving a relative position judging instruction issued by the master station, judging whether the power frequency active power flow direction monitored by the measuring terminal is forward, if not, returning to the master station, and waiting for issuing the relative position judging instruction again.
Optionally, when the distribution area has access to the low-voltage distributed photovoltaic equipment, the relative position relationship between any two user electric meters is judged in the night time period when the photovoltaic stops outputting power.
Optionally, the evening period during which photovoltaic ceases to exert power is 19:00 hours to 21:00 hours.
The invention provides a distinguishing device and a method for the relative position of power users in a distribution area, which are applied to a distribution area, wherein the distribution area comprises at least two user electric meters, and the device comprises: the high-frequency signal module is installed in the user electric meters, and the direction distinguishing module is respectively configured at the upper end and the lower end of each user electric meter and a T-connection line of the connected power supply branch; the high-frequency signal module transmits a high-frequency signal or receives the high-frequency signal to generate high-frequency resonance; the direction judging module monitors a power frequency active power flow direction and a high-frequency active power flow direction at an installation position, and judges the relative position relation between any two user electric meters in a distribution substation area according to the relation between the power frequency active power flow direction and the high-frequency active power flow direction.
Therefore, the invention has the beneficial effects that:
according to the invention, a high-frequency signal module is expanded in an intelligent user electric meter, and a high-frequency signal is injected into a power line or received to generate high-frequency resonance; the direction distinguishing modules are respectively arranged at the upper end and the lower end of the T connection line of the user electric meter and the connected power supply branch, and the direction relation between the high-frequency active power flow and the power-frequency active power flow is analyzed through the direction distinguishing modules, so that the upstream and downstream position relation between any two user electric meters can be judged, and the affiliated relation of the branch lines of any two user electric meters can also be judged. According to the invention, the direction relation between the power frequency active power flow and the high-frequency active power flow is compared through the direction judging module, so that the effectiveness and the accuracy of the relative position of a power user are ensured.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic diagram comparing the power frequency active power flow with the high frequency active power flow direction according to the present invention;
FIG. 3 is a schematic flow diagram of the process of the present invention;
fig. 4 is a schematic flowchart of a method for determining a relative position according to an embodiment of the present invention.
Detailed Description
Interpretation of terms:
electric energy meter: the user electric energy metering device is also called a user electric meter, and can collect various electric energy data.
Active power flow: and active power distribution during steady-state operation of the power grid.
High-frequency current signal: small current signals with very small amplitude (milliampere level) and very high frequency (f > >50 Hz).
A resonant circuit: the inductive reactance and the capacitive reactance in the circuit are equal in size and are divided into series resonance and parallel resonance, the series resonance refers to the series connection of the inductive reactance and the capacitive reactance, the positive and negative of the inductive reactance and the capacitive reactance are offset, the reactance value is zero, and the circuit is equivalent to a short circuit; when the circuit is in parallel resonance, the inductive reactance and the capacitive reactance are connected in parallel, the impedance is infinite after the inductive reactance and the capacitive reactance are connected in parallel, and the circuit is equivalent to an open circuit.
A direction judging module: the direction of power flow through the module can be detected.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, 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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the invention provides a device and a method for judging the relative position of power users in a distribution area, which aim to solve the technical problem of low accuracy in determining the relative position of the power users in a low-voltage distribution area in the prior art.
In the existing common method for judging the relative position of the power consumer, a manual power failure checking method determines that each user electric meter belongs to a specific branch line by powering off each level of branch switches in a low-voltage distribution area, and then judges the relative position of the power consumer in the low-voltage distribution area.
The carrier communication method is characterized in that a carrier signal generating module is arranged in a concentrator, a user ammeter is provided with a signal receiving module, the distance between the user ammeter and the concentrator is determined by utilizing the time difference between signal generation and signal reception, and then the relative positions of all the user ammeters are deduced.
The voltage amplitude comparison method is used for judging the relative position of the user electric meters in a distribution area based on the mechanism that the voltage amplitude of a radial distribution network with a single-side power supply drops from the head end to the tail end, the method can effectively arrange the upstream and downstream relations of the user electric meters in most distribution areas, but for a large number of low-voltage distribution areas accessed by distributed photovoltaic, the voltage amplitude of the downstream user electric meters is higher than that of the upstream user electric meters, and the method cannot provide the correct relative position relation of the user electric meters, so that the accuracy of a checking result is greatly reduced.
The disadvantages of the prior art described above mainly include:
(1) the accuracy cannot be guaranteed, the judgment result of the manual power failure troubleshooting method is low in accuracy, only the relative position with the branch switch as the unit can be judged, the judgment result accuracy of the carrier communication method and the voltage amplitude comparison method is low, and erroneous judgment is caused by influences of signal crosstalk of a station area, distributed photovoltaic access and the like.
(2) The application scenario is limited, the manual power failure troubleshooting method influences normal power supply of users, labor cost is too high, the carrier communication method is suitable for a station area with a small power supply radius, and the voltage amplitude comparison method is only suitable for a radial power distribution network without distributed power access.
Referring to fig. 1, an embodiment of an apparatus for determining a relative position of a power consumer in a distribution area according to the present invention is applied to a distribution area, where the distribution area includes at least two power meters, and the apparatus includes:
the high-frequency signal module is installed in the user electric meters, and the direction distinguishing module is respectively configured at the upper end and the lower end of each user electric meter and a T-connection line of the connected power supply branch;
the high-frequency signal module transmits a high-frequency signal or receives the high-frequency signal to generate high-frequency resonance;
the direction judging module monitors a power frequency active power flow direction and a high-frequency active power flow direction at an installation position, and judges the relative position relation between any two user electric meters in a power distribution area according to the relation between the power frequency active power flow direction and the high-frequency active power flow direction.
In an embodiment of the present invention, the power distribution grid includes at least two user electric meters, each of the user electric meters is installed with a high-frequency signal module, and the two user electric meters are respectively marked as a first user electric meter and a second user electric meter. It should be noted that the first user meter refers to one of any two user meters, and the second user meter refers to the other of any two user meters.
As shown in FIG. 1, each branch of the power supply main line of the transformer area is provided with an outlet A from left to right 11 、A 12 、…、A 1n 、…、A 21 、A 22 、…、A 2n 、…、A m1 、A m2 、…、A mn The intelligent user ammeter is characterized in that a high-frequency signal module is installed in the intelligent user ammeter corresponding to the user intelligent ammeter below each branch line, and the intelligent user ammeter can be equivalent to a series circuit of the impedance of the ammeter and a high-frequency signal generating circuit. High frequency signal module is installed in a manner of injecting and receiving high frequency signalsIn the user meter. The high-frequency signal may be a high-frequency current signal or another high-frequency signal such as a high-frequency voltage signal.
It will be appreciated that the first supply branch comprises a 11 、A 12 、…、A 1n The n intelligent user electric meters, A 11 In A 12 、…、A 1n Upstream of these consumer meters, A 12 In A 11 But is at A 13 、…、A 1n Upstream of these consumer meters. Similarly, the second supply branch line comprises A 21 、A 22 、…、A 2n The n smart consumer meters.
In this embodiment, a direction determination module is respectively configured at the upper end and the lower end of each smart user electric meter and the connection branch T of the connected power supply branch, as shown in fig. 1, c 11u 、c 11d 、c 12u 、c 12d 、…、c 1nd 、c m1u 、c m1d 、c m2u 、c m2d 、…、c mnd The direction judging module can monitor the directions of power frequency active power flow and high frequency active power flow at the installation node. For example, in the smart user meter A 11 The upper and lower ends of the T connection line of the connected power supply branch are respectively provided with a direction discrimination module c 11u 、c 11d . Taking three user electric meters in a dashed box in fig. 1 as an example, one of the electric meters a is selected pi The high-frequency signal transmitter is used for transmitting a high-frequency current signal by using the high-frequency signal module, the intensity of the high-frequency current signal is extremely small, and the high-frequency current signal is superposed in a power frequency signal and cannot influence the normal operation of a circuit; respectively select the ammeter A pj And A qj As a high-frequency signal receiver, setting a high-frequency signal module to resonate with a user electric meter, wherein the high-frequency equivalent impedance of the high-frequency signal module is zero, and the user electric meter is equivalent to a conducting wire; then, the user electric meter A is used pj And A qj As high-frequency signal transmitter, user's electric meter A pi As a high-frequency signal receiver, the electric meter A is determined by judging the direction relation between the power frequency active power flow and the high-frequency active power flow monitored by two rounds of the direction judging module pi 、A pj And A qj The specific determination method of the relative positional relationship is described with reference to FIG. 2.
It should be noted that the user electric meter A is used pj And A qj The resonance of the user ammeter enables high-frequency current signals to flow through the user ammeter as completely as possible, and the signal receiving intensity of the user ammeter and the accuracy of the direction judging module can be improved.
As shown in fig. 2, P is the power frequency active power flow monitored by the direction determination module, and the direction is from the outlet of the transformer to the user electric meter; p h<pi,pj> Module c for judging direction pju Monitored by the user meter A pi Transmitting high frequency signals and supplied by a user meter A pj Receiving high-frequency active power flow of high-frequency signal, the direction is from high-frequency signal transmitting end ammeter to high-frequency signal receiving end ammeter, and so on, P h<pj,pi> 、P h<qi,pi> 、P h<pi,qj> The high-frequency active power flows monitored by the direction judging module are respectively set for different electric meters.
If two user electric meters are under the same power supply branch outgoing line, the user electric meter A in the figure 2 is used pi And A pj For example, when the user meter A pi As high-frequency signal transmitter, user electric meter A pj When the module is used as a high-frequency signal receiver, the direction discrimination module c pju The monitored power frequency active power flow has the same direction as the high-frequency active power flow; when the user electric meter A pj As high-frequency signal transmitter, user electric meter A pi When the module is used as a high-frequency signal receiver, the direction discrimination module c pid The monitored power frequency active power flow and the high frequency active power flow are opposite in direction, and the user ammeter A pi At A pj An upstream position.
It should be noted that, when two user electric meters are assumed to be under the same branch outlet, the power frequency active power flow direction is fixed (certainly from upstream to downstream), and the user electric meter a is connected to the power frequency active power flow direction pi And A pj Respectively used as a high-frequency signal transmitting party and a high-frequency signal receiving party in turn, so that the direction judging module c only needs to judge the direction of the high-frequency signal transmitting party and the high-frequency signal receiving party in turn pid And c pju A direction judging module c pid And c pju Comparing the monitored power frequency active power flow with the high frequency active power flow to obtain a user electric meter A pi And A pj The relative positional relationship of (a).
If two user electric meters are under different branch outgoing lines, user electric meter A in figure 2 is used pi And A qj For example, when the user meter A pi As high-frequency signal transmitter, user electric meter A qj When the module is used as a high-frequency signal receiver, the direction discrimination module c qju The monitored power frequency active power flow and the monitored high frequency active power flow have the same direction; when the user electric meter A qj As high-frequency signal transmitter, user electric meter A pi When the module is used as a high-frequency signal receiver, the direction discrimination module c piu The monitored power frequency active power flow and the monitored high frequency active power flow have the same direction.
Referring to fig. 3, the present invention further provides an embodiment of a method for determining a relative position of a power consumer in a distribution area, which is applied to a distribution area, and the method includes the following steps:
s100: when the power frequency active power flow direction is the forward direction, a first user electric meter in any two user electric meters is selected to transmit a high-frequency signal, a second user electric meter receives the high-frequency signal to generate high-frequency resonance, the second direction distinguishing module compares the power frequency active power flow direction with the high-frequency active power flow direction to obtain a first distinguishing result, and the second direction distinguishing module is installed at the upper end of a T connection line of the second user electric meter and a connected power supply branch;
s200: selecting the second user electric meter to transmit a high-frequency signal, receiving the high-frequency signal by the first user electric meter to generate high-frequency resonance, comparing a power frequency active power flow direction with a high-frequency active power flow direction by the first direction judging module to obtain a second judging result, and installing the first direction judging module at the lower end of a T connection line of the first user electric meter and the connected power supply branch;
s300: determining the relative position relationship between the first user electric meter and the second user electric meter according to the first judgment result and the second judgment result;
s400: and repeating the steps until the relative position relationship is determined between every two user electric meters in the power distribution area, so that the relative positions of all the power users are obtained.
Before executing the step S100, the main station issues a judgment instruction of the relative position of the user ammeter, the measurement terminal monitors the power frequency active power flow direction, if the monitored power frequency active power flow is reverse, the main station returns to wait for the main station to issue the judgment instruction of the relative position again; and if the monitored power frequency active power flow is in the forward direction, executing the step S100.
In step S100 of this embodiment, when the power frequency active power flow direction is the forward direction, a first user electric meter of any two user electric meters is selected to transmit a high-frequency signal, a second user electric meter receives the high-frequency signal to generate a high-frequency resonance, a second direction determination module is installed at an upper end of a connection line of the second user electric meter and a connected power supply branch T, and the second direction determination module compares the power frequency active power flow direction with the high-frequency active power flow direction to obtain a first determination result, including:
when the second direction judging module judges that the power frequency active power flow direction is opposite to the high frequency active power flow direction, the first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the downstream of the second user electric meter; and when the second direction judging module judges that the power frequency active power flow direction is the same as the high-frequency active power flow direction, continuing to execute the following steps.
In step S200 of this embodiment, selecting a second user electric meter to transmit a high-frequency signal, where the first user electric meter receives the high-frequency signal to generate a high-frequency resonance, the first direction determining module is installed at a lower end of a junction line of the first user electric meter and the power supply branch T connected thereto, and the first direction determining module compares a power frequency active power flow direction and a high-frequency active power flow direction to obtain a second determining result, where the second determining result includes:
when the first direction judging module judges that the power frequency active power flow direction is opposite to the high frequency active power flow direction, the first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the upstream of the second user electric meter; when the first direction judging module judges that the power frequency active power flow direction is the same as the high-frequency active power flow direction, the first user electric meter and the second user electric meter are located on different power supply branch lines.
In step S300, a relative position relationship between the first user electric meter and the second user electric meter is determined according to the first determination result and the second determination result.
It is 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:
(1) the first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the downstream of the second user electric meter;
(2) the first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the upstream of the second user electric meter;
(3) the first user electric meter and the second user electric meter are positioned on different power supply branch lines.
According to the method for judging the relative position of the power users in the transformer area, a high-frequency signal module is expanded in an intelligent user electric meter, and high-frequency signals are injected into a power line or received to generate high-frequency resonance; the direction distinguishing modules are respectively arranged at the upper end and the lower end of the T joint of the user electric meters, and the direction relation between the high-frequency active power flow and the power-frequency active power flow is analyzed through the direction distinguishing modules, so that the upstream and downstream position relation between any two user electric meters can be judged, and the affiliated relation of branch lines of any two user electric meters can also be judged. According to the invention, the direction relation between the power frequency active power flow and the high-frequency active power flow is compared through the direction judging module, so that the effectiveness and the accuracy of the relative position of a power user are ensured.
Referring to fig. 4, in another embodiment of the method for determining the relative position of the power consumers in the distribution room according to the present invention, the embodiment determines the relative position of the power consumers in the distribution room based on comparison of active power flow directions at different frequencies, so as to implement the sorting and updating of the branch line relationship and the upstream and downstream relative position relationship of the power meter in the distribution room, which includes the following specific steps:
(1) the main station issues a relative position distinguishing instruction of the user ammeter, the measuring terminal monitors the direction of the power frequency active power flow, if the monitored direction of the power frequency active power flow is reverse, the main station returns to the main station, and the main station waits for issuing the relative position distinguishing instruction again; and if the monitored power frequency active power flow direction is the forward direction, continuing to execute the process of judging the relative position.
(2) And selecting two intelligent user electric meters X and Y, and distinguishing the first user electric meter X and the second user electric meter Y. Firstly, a first user electric meter X is used as a high-frequency signal transmitting end, a second user electric meter Y is used as a high-frequency signal receiving end, a high-frequency signal module in the intelligent electric meter Y enables the electric meter to generate series resonance, so that high-frequency signals are amplified and are convenient to detect, a direction distinguishing module, namely a second direction distinguishing module, at the position, corresponding to a power supply branch T, of the second user electric meter Y compares a high-frequency active power flow direction cY with a power frequency active power flow direction cP, and if the cY is opposite to the cP, the first user electric meter X and the second user electric meter Y are located under the same power supply branch and the first user electric meter X is located at the downstream of the second user electric meter Y; if cY and cP are in the same direction, the judging process is continuously executed.
(3) Then, a second user electric meter Y is used as a high-frequency signal transmitting end, a first user electric meter X is used as a high-frequency signal receiving end, a signal module in the first user electric meter X enables the electric meter to generate series resonance, so that high-frequency signals are amplified and are convenient to detect, a direction distinguishing module, namely a first direction distinguishing module, at the position, corresponding to a power supply branch T, of the first user electric meter X compares a high-frequency active power flow direction cX with a power frequency active power flow direction cP, and if the cX is opposite to the cP, the first user electric meter X and the second user electric meter Y are located under the same power supply branch line and the first user electric meter X is located at the upstream of the second user electric meter Y; and if the cX and the cP are in the same direction, the first user electric meter X and the second user electric meter Y are positioned under different power supply branch lines.
(4) And (4) returning the judgment result to the measuring terminal, continuously selecting any two intelligent user electric meters, repeatedly executing the steps (2) and (3) until the relative position relation between every two user electric meters in the distribution area is determined, and finally sending the judgment result to the master station to sort and judge the relative positions of all power users in the distribution area.
According to the invention, a high-frequency signal module is expanded in an intelligent user electric meter, and a high-frequency signal is injected into a power line or received to generate high-frequency resonance; the upper end and the lower end of a T joint of a user electric meter are respectively provided with a direction distinguishing module, the direction relation between the high-frequency active power flow and the power-frequency active power flow is analyzed through the direction distinguishing module, the relative position relation of any two power users is distinguished according to different relation conditions, and therefore the relative positions of all the power users in the platform area are sorted and distinguished.
The method for judging the relative position of the power consumer in the transformer area provided by the embodiment can judge the upstream and downstream position relationship between any two user electric meters, can also judge the affiliated relationship of branch lines of any two user electric meters, and can ensure the effectiveness and accuracy of the relative position of the power consumer by comparing the direction relationship of the power frequency active power flow and the high-frequency active power flow through the direction judging module.
With the massive access of low-voltage distributed photovoltaic, the conventional method for judging the relative position of power users in a low-voltage transformer area is influenced by the distributed photovoltaic access and may have more limitations.
For a scene with low-voltage distributed photovoltaic equipment connected in a transformer area, although the phenomenon that the photovoltaic grid-connected equipment reversely transmits power to a primary power grid possibly occurs, the power frequency active power flow direction flows to a transformer from an ammeter end, the principle can be selected to be judged when the photovoltaic stops outputting power every night according to the direction of the active current monitored by the transformer area intelligent measurement terminal, and the flow direction of the power frequency active power flow is ensured to be the forward direction.
On the basis of the foregoing embodiment, when a scene in which a large number of low-voltage distributed photovoltaic devices are connected exists in a distribution substation area, the relative position relationship between any two user electric meters can be determined in a evening period in which photovoltaic output is stopped every day.
Based on the principle, the relative position of the user electric meters is judged at 19: 00-21: 00 every day, two user electric meters are randomly selected each time, and two high-frequency signal transmitting and receiving processes are respectively carried out, wherein each user electric meter is used as a high-frequency signal transmitting end and a high-frequency signal receiving end in the two-wheel process until the relative position of all electric meters in the power distribution area is judged, namely the relative position relation between every two user electric meters is determined, and finally the relative positions of all power users in the power distribution area can be identified through combing and judging.
The invention aims to solve the problem that the relative position of power users in a distribution area under the scene that a large number of distributed photovoltaic access low-voltage distribution networks are difficult to accurately judge. The high-frequency signal module is arranged in each user electric meter in a signal injection and signal receiving mode, so that high-frequency current signals can be transmitted and received, high-frequency resonance can be generated on the electric meter, and the high-frequency equivalent impedance of the electric meter connected in series in a circuit is zero; the method comprises the steps that a direction distinguishing module is respectively installed at the upstream and the downstream of a T-connection branch of a power supply main line to which each user electric meter is connected, the directions of power frequency active power flow and high-frequency active power flow at installation nodes can be monitored, one user electric meter is used as a high-frequency signal generator, the other user electric meter is provided with a high-frequency resonance generating device used as a high-frequency signal receiver, and the relative position relation of the two user electric meters is judged through the direction relation of the power frequency active power flow and the high-frequency active power flow monitored by the direction distinguishing module.
The method provided by the embodiment can be suitable for a large number of low-voltage distribution areas accessed by distributed photovoltaic, and is richer in application scenes and wider in application range.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention is essentially or partially contributing to the prior art or the whole of the technical solution
Portions or parts may be embodied in the form of a software product stored on a storage medium and including instructions for causing a computing device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the methods described in the various embodiments of the invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a distinguishing device of district electric power consumer relative position which characterized in that is applied to the distribution district, the distribution district includes two at least consumer's ammeter, the device includes:
the high-frequency signal module is installed in the user electric meters, and the direction distinguishing module is respectively configured at the upper end and the lower end of each user electric meter and a T-connection line of the connected power supply branch;
the high-frequency signal module transmits a high-frequency signal or receives the high-frequency signal to generate high-frequency resonance;
the direction judging module monitors a power frequency active power flow direction and a high-frequency active power flow direction at an installation position, and judges the relative position relation between any two user electric meters in a power distribution area according to the relation between the power frequency active power flow direction and the high-frequency active power flow direction.
2. The device for determining the relative location of power consumers in a distribution area according to claim 1, wherein the high frequency signal module installed in the consumer electric meter comprises:
the high frequency signal module is installed in the consumer electric meter in a manner of injecting a high frequency signal and receiving a high frequency signal.
3. A method for judging the relative position of power users in a distribution area is characterized by being applied to a distribution area and comprising the following steps of:
when the power frequency active power flow direction is the forward direction, a first user electric meter in any two user electric meters is selected to transmit a high-frequency signal, a second user electric meter receives the high-frequency signal to generate high-frequency resonance, the second direction judgment module compares the power frequency active power flow direction with the high-frequency active power flow direction to obtain a first judgment result, and the second direction judgment module is installed at the upper end of a T-connection line of the second user electric meter and a connected power supply branch;
selecting the second user electric meter to transmit a high-frequency signal, receiving the high-frequency signal by the first user electric meter to generate high-frequency resonance, comparing a power frequency active power flow direction with a high-frequency active power flow direction by the first direction judging module to obtain a second judging result, and installing the first direction judging module at the lower end of a T-connection line of the first user electric meter and the connected power supply branch;
determining the relative position relationship between the first user electric meter and the second user electric meter according to the first judgment result and the second judgment result;
and repeating the steps until the relative position relationship is determined between every two user electric meters in the power distribution area, so that the relative positions of all the power users are obtained.
4. The method for determining the relative position of the power consumers in the distribution room according to claim 3, wherein the comparing the power frequency active power flow direction and the high frequency active power flow direction by the second direction determination module to obtain the first determination result comprises:
when the second direction judging module judges that the power frequency active power flow direction is opposite to the high frequency active power flow direction, the first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the downstream of the second user electric meter;
and when the second direction judging module judges that the power frequency active power flow direction is the same as the high-frequency active power flow direction, continuing to execute the following steps.
5. The method for determining the relative position of the power consumers in the distribution room of claim 3, wherein the step of comparing the power frequency active power flow direction with the high frequency active power flow direction by the first direction determination module to obtain a second determination result comprises the steps of:
when the first direction judging module judges that the power frequency active power flow direction is opposite to the high frequency active power flow direction, the first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the upstream of the second user electric meter;
and when the first direction judging module judges that the power frequency active power flow direction is the same as the high-frequency active power flow direction, the first user electric meter and the second user electric meter are positioned on different power supply branch lines.
6. The method for determining the relative position of the power consumers in the distribution area according to claim 3, wherein the relative position relationship between the first consumer meter and the second consumer meter comprises:
the first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the downstream of the second user electric meter; or
The first user electric meter and the second user electric meter are positioned on the same power supply branch line, and the first user electric meter is positioned at the upstream of the second user electric meter; or
The first user electric meter and the second user electric meter are located on different power supply branch lines.
7. The method for determining the relative location of power consumers in a distribution area according to any one of claims 4 to 6, wherein when the power frequency active power flow direction is a forward direction, a first consumer electric meter of any two consumer electric meters is selected to transmit a high frequency signal, and before a second consumer electric meter receives the high frequency signal and generates high frequency resonance, the method further comprises:
and receiving a relative position judging instruction issued by the master station, judging whether the power frequency active power flow direction monitored by the measuring terminal is forward, if not, returning to the master station, and waiting for issuing the relative position judging instruction again.
8. The method for determining the relative position of the power consumers in the distribution area according to claim 3, wherein when the low-voltage distributed photovoltaic equipment is accessed to the distribution area, the relative position relationship between any two of the consumer meters is determined in the evening period of photovoltaic stop output.
9. The method for determining the relative location of the power consumers in the distribution area according to claim 8, wherein the night period when the photovoltaic stops applying power is 19:00 hours to 21:00 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210675480.6A CN115021268A (en) | 2022-06-15 | 2022-06-15 | Device and method for distinguishing relative position of power consumer in transformer area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210675480.6A CN115021268A (en) | 2022-06-15 | 2022-06-15 | Device and method for distinguishing relative position of power consumer in transformer area |
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| CN115021268A true CN115021268A (en) | 2022-09-06 |
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| CN202210675480.6A Pending CN115021268A (en) | 2022-06-15 | 2022-06-15 | Device and method for distinguishing relative position of power consumer in transformer area |
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| CN (1) | CN115021268A (en) |
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- 2022-06-15 CN CN202210675480.6A patent/CN115021268A/en active Pending
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