CN111929539A - Method and system for positioning fault of power distribution network intelligent switch fusion traveling wave - Google Patents
Method and system for positioning fault of power distribution network intelligent switch fusion traveling wave Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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Abstract
The application discloses a method and a system for positioning a fault of a power distribution network intelligent switch fusion traveling wave, which relate to the technical field of line fault detection, and the method comprises the following steps: according to the distribution condition of the power distribution network, a plurality of monitoring devices are arranged at intervals and connected to the power distribution network, each monitoring device comprises a power frequency voltage sensor, a power frequency current sensor, a traveling wave current transformer and an intelligent switch, and the power frequency voltage sensors, the power frequency current sensors and the traveling wave current transformers are integrated on the intelligent switches; monitoring voltage, current and traveling wave signals at respective positions by a power frequency voltage sensor, a power frequency current sensor and a traveling wave current transformer; determining a fault interval of a fault point through an intelligent switch according to the monitored voltage or current; and according to the determined fault interval, determining the traveling wave signals monitored in the fault interval through the intelligent switch, and calculating the position of a fault point. The purpose of quick and accurate fault positioning is achieved by means of intelligent switches distributed on a power distribution network.
Description
Technical Field
The application relates to the technical field of line fault detection, in particular to a method and a system for positioning a fault of a power distribution network intelligent switch fusion traveling wave.
Background
Compared with a power transmission line, the power distribution line in the power distribution network is complex in structure and large in scale, and when a fault occurs, the difficulty in finding the fault position is large, so that the power supply reliability cannot meet the increasing requirements of users.
However, the distribution line has long, multiple points, wide area, complex channel, complex fault and its reasons, and many branches, large fault transition resistance, and difficult effective detection of fault signals, so that the precise positioning is very difficult.
In the related art, some schemes capable of accurately positioning fault points exist, but the algorithm is complicated, for example, the chinese patent invention "a power distribution network fault positioning method and system" with publication number CN111398738A discloses the following steps: step 1, determining a fault location domain by taking a fault location device and the tail end of a line/branch as boundaries, and constructing a fault location matrix; step 2, measuring the zero line mode time difference of the positioning nodes, and constructing a zero line mode arrival time difference matrix of each fault positioning node; step 3, determining the node corresponding to the minimum value as the main locating point and the locating domain of the whole network when the fault occurs; step 4, selecting a node with the minimum time difference in the boundary of the positioning domain and determining the positioning domain of the node; step 5, determining a possible fault area; and 6, carrying out fault location according to the fault location rule aiming at the possible fault area.
Meanwhile, the above patent also mentions that the current positioning device for finding faults by using traveling waves in the power distribution network is generally installed at the tail end of a line or branch, and the tail end is easily interfered by a large amount of harmonic waves when the positioning device acts, but the problem of how to divide a positioning interval can hardly be solved if the positioning device is not installed at the tail end of the line, so that we have reason to believe that when the division of the positioning interval has problems, the specific position of a fault point is more difficult to be positioned by using the traveling waves.
Disclosure of Invention
The embodiment of the application provides a method and a system for fault location of a power distribution network intelligent switch fused traveling wave, which achieve the purpose of rapidly and accurately locating faults by integrating various sensors on the intelligent switches by utilizing the distribution of the intelligent switches on the power distribution network.
On the one hand, the embodiment of the application provides a method for positioning faults of fusion traveling waves of intelligent switches of a power distribution network, comprising the following steps of:
according to the distribution condition of the power distribution network, a plurality of monitoring devices are arranged at intervals and connected to the power distribution network, each monitoring device comprises a power frequency voltage sensor, a power frequency current sensor, a traveling wave current transformer and an intelligent switch, and the power frequency voltage sensors, the power frequency current sensors and the traveling wave current transformers are integrated on the intelligent switches;
the power frequency voltage sensor and the power frequency current sensor monitor the voltage and the current at respective positions, and the traveling wave current transformer monitors traveling wave signals at respective positions;
according to the monitored voltage or current, parameter characteristic information of a corresponding position is obtained through the intelligent switch, and a fault interval of a fault point is determined;
and according to the determined fault interval, determining a traveling wave current transformer in the fault interval through the intelligent switch, calling a traveling wave signal monitored by the traveling wave current transformer in the fault interval, and calculating the position of the fault point.
In the embodiment of the present application, preferably, the intelligent switch includes a secondary fusion switch.
Preferably, the specific step of determining, according to the determined fault section, the traveling wave current transformer in the fault section through the intelligent switch, calling a traveling wave signal monitored by the traveling wave current transformer in the fault section, and calculating the position of the fault point includes:
according to the determined fault interval, the traveling wave current transformers on the upper and lower streams of the fault point in the fault interval are determined through the intelligent switch;
calling a traveling wave signal monitored by a traveling wave current transformer in the fault interval;
and calculating the position of the fault point according to the time difference of the traveling wave signals monitored by the traveling wave current transformers on the upper and lower streams of the fault point.
Preferably, the specific step of calculating the position of the fault point according to the time difference of the traveling wave signals monitored by the traveling wave current transformers on and downstream of the fault point is as follows:
collecting the time when all traveling wave current transformers in the fault interval monitor traveling wave signals;
comparing the collected moments of all traveling wave current transformers at the downstream of the fault point, and determining the traveling wave current transformer collected firstly;
and calculating the position of the fault point according to the time difference between the traveling wave current transformer at the upstream of the fault point and the time when the traveling wave current transformer which is firstly collected is determined to collect.
Preferably, the calculation formula for calculating the position of the fault point according to the time difference between the traveling wave current transformer upstream of the fault point and the time at which the traveling wave current transformer collected first is determined is as follows:
in the formula, L is the distance between two intelligent switches, L1Distance from fault point to intelligent switch upstream of fault point, L2Distance from fault point to intelligent switch downstream of fault point, t1Is the time, t, of the travelling-wave signal to the travelling-wave current transformer upstream of the fault point2And V is the propagation speed of the traveling wave in the power distribution network line at the moment when the traveling wave current reaches the traveling wave current transformer at the downstream of the fault point.
Preferably, when a single-phase ground fault occurs in the power distribution network, the voltage and the current monitored by the power frequency voltage sensor and the power frequency current sensor are respectively zero-sequence voltage and zero-sequence current, and the parameter characteristic information is transient reactive power, and the method specifically includes the steps of:
the power frequency voltage sensor and the power frequency current sensor respectively monitor zero sequence voltage and zero sequence current at respective positions;
after the zero sequence voltage is monitored, the intelligent switch calculates the transient reactive power of the current position according to the monitored zero sequence voltage and zero sequence current;
and determining a fault interval of a fault point according to the transient reactive power calculated by the intelligent switches.
Preferably, after the intelligent switch calculates the transient reactive power of the current position according to the monitored zero-sequence voltage and zero-sequence current, the method further comprises:
and controlling the intelligent switches to locally and closely isolate the fault point by adopting a fixed value setting range matching mode according to transient reactive power calculated by the intelligent switches.
On the other hand, the embodiment of the application also provides a system for positioning the fusion traveling wave fault of the intelligent switch of the power distribution network, which comprises a terminal and a plurality of monitoring devices, wherein each monitoring device comprises a power frequency voltage sensor, a power frequency current sensor, a traveling wave current transformer and an intelligent switch, and the power frequency voltage sensor, the power frequency current sensor and the traveling wave current transformer are integrated on the intelligent switch; the terminal is connected with all the intelligent switches, and the intelligent switches are connected with the power frequency voltage sensor, the power frequency current sensor and the traveling wave current transformer;
the monitoring devices are arranged at intervals according to the distribution condition of the power distribution network and are connected to the power distribution network;
the power frequency voltage sensor, the power frequency current sensor and the traveling wave current transformer are respectively used for monitoring voltage, current and traveling wave signals at respective positions;
the intelligent switch is used for obtaining parameter characteristic information of a corresponding position according to the monitored voltage or current;
the terminal is used for determining a fault section of a fault point according to the obtained parameter characteristic information of the corresponding position;
and the terminal is also used for determining a traveling wave current transformer in the fault interval through the intelligent switch according to the determined fault interval, calling a traveling wave signal monitored by the traveling wave current transformer in the fault interval and calculating the position of the fault point.
In this embodiment of the present application, preferably, when a single-phase ground fault occurs in the power distribution network, the voltage and the current monitored by the power frequency voltage sensor and the power frequency current sensor are zero-sequence voltage and zero-sequence current, respectively, and the parameter characteristic information is transient reactive power; the system specifically comprises:
the power frequency voltage sensor and the power frequency current sensor are respectively used for monitoring zero sequence voltage and zero sequence current of respective positions;
the intelligent switch is used for calculating the transient reactive power of the current position according to the monitored zero sequence voltage and zero sequence current after the zero sequence voltage is monitored;
and the terminal is used for determining a fault interval of a fault point according to the transient reactive power calculated by the intelligent switches.
Preferably, the intelligent switch is further configured to locally and closely isolate the fault point in a fixed-value setting range coordination manner according to the transient reactive power obtained through respective calculation.
The beneficial effects that technical scheme that this application embodiment provided brought include:
(1) the embodiment of the application provides a method and a system for positioning a fault of a power distribution network by fusing an intelligent switch with a traveling wave, wherein a power frequency voltage sensor, a power frequency current sensor and a traveling wave current transformer are integrated on the intelligent switch by utilizing the distribution condition of the intelligent switch on the power distribution network, and the fault section of a fault point is quickly positioned through the intelligent switch according to the voltage and the current collected by the power frequency voltage sensor and the power frequency current sensor; and then, according to the fault section of the fault point, the traveling wave signal monitored by the traveling wave current transformer in the fault section is determined through the intelligent switch, and the specific position of the fault point is positioned by combining a traveling wave method, so that the positioning accuracy is improved, and redundant calculation is avoided.
(2) In the embodiment of the application, the zero sequence voltage monitored by the power frequency voltage transformer is used as a trigger signal for fault location, the zero sequence voltage and the zero sequence current can be rapidly monitored when a single-phase earth fault occurs, and the transient reactive power is calculated through the intelligent switch so as to rapidly locate the fault interval of a fault point.
(3) In the embodiment of the application, the intelligent switches adopt a fixed value setting extreme difference matching mode according to the flow direction of the transient reactive power, the fault points are isolated locally and nearby, transient faults can be detected, permanent faults can also be detected, the fault maintenance is safe and reliable, meanwhile, the power failure area on the power distribution network can be shortened to the minimum, and the economic loss is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart of a method for positioning a fault of a power distribution network intelligent switch fused with traveling waves according to an embodiment of the present disclosure;
fig. 2 is a schematic flow diagram of transient reactive power on each intelligent switch in the embodiment of the present application;
fig. 3 is a structural block diagram of a system for positioning a power distribution network intelligent switch fusion traveling wave fault according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a method for positioning faults of fusion traveling waves of intelligent switches of a power distribution network, which comprises the following steps:
according to the distribution condition of the power distribution network, a plurality of monitoring devices are arranged at intervals and connected to the power distribution network, each monitoring device comprises a power frequency voltage sensor, a power frequency current sensor, a traveling wave current transformer and an intelligent switch, and the power frequency voltage sensors, the power frequency current sensors and the traveling wave current transformers are integrated on the intelligent switches;
the power frequency voltage sensor and the power frequency current sensor monitor the voltage and the current at respective positions, and the traveling wave current transformer monitors traveling wave signals at respective positions;
according to the monitored voltage or current, parameter characteristic information of a corresponding position is obtained through the intelligent switch, and a fault interval of a fault point is determined;
and according to the determined fault interval, determining a traveling wave current transformer in the fault interval through the intelligent switch, calling a traveling wave signal monitored by the traveling wave current transformer in the fault interval, and calculating the position of the fault point.
In the embodiment of the application, the distribution condition of the intelligent switches on the power distribution network is utilized, the form of integrating the power frequency voltage sensor, the power frequency current sensor and the traveling wave current transformer on the intelligent switches is adopted, and the fault section of a fault point is quickly positioned through the intelligent switches according to the voltage and the current collected by the power frequency voltage sensor and the power frequency current sensor; and then, according to the fault section of the fault point, the traveling wave signal monitored by the traveling wave current transformer in the fault section is determined through the intelligent switch, and the specific position of the fault point is positioned by combining a traveling wave method, so that the positioning accuracy is improved, and redundant calculation is avoided.
In some embodiments, the intelligent switch comprises a two-shot fusion switch. In the embodiment of the application, the intelligent switch adopts a primary and secondary fusion switch, so that local information collection and rapid calculation can be realized, and rapid and accurate positioning of faults can be realized more rapidly and reliably.
When a single-phase earth fault occurs in the power distribution network, the voltage and the current monitored by the power frequency voltage sensor and the power frequency current sensor are respectively zero-sequence voltage and zero-sequence current, the parameter characteristic information is transient reactive power, the parameter characteristic information of the corresponding position is obtained through the intelligent switch according to the monitored voltage or current, and the step of determining the fault interval of the fault point specifically comprises the following steps:
the power frequency voltage sensor and the power frequency current sensor respectively monitor zero sequence voltage and zero sequence current at respective positions;
after the zero sequence voltage is monitored, the intelligent switch calculates the transient reactive power of the current position according to the monitored zero sequence voltage and zero sequence current, namely parameter characteristic information of the corresponding position is obtained through the intelligent switch;
and determining a fault interval of a fault point according to the transient reactive power calculated by the intelligent switches.
Referring to fig. 1, an embodiment of the present application specifically provides a method for positioning a fault of a power distribution network intelligent switch fused with a traveling wave, including:
step S1: according to the distribution condition of the power distribution network, a plurality of monitoring devices are arranged at intervals and connected to the power distribution network, each monitoring device comprises a power frequency voltage sensor, a power frequency current sensor, a traveling wave current transformer and a primary-secondary fusion switch, and the power frequency voltage sensors, the power frequency current sensors and the traveling wave current transformers are integrated on the primary-secondary fusion switches;
step S2: the power frequency voltage sensors monitor voltages at respective positions, the power frequency current sensors monitor currents at respective positions, and the traveling wave current transformers monitor traveling wave signals at respective positions; when a single-phase earth fault occurs, the power frequency voltage sensor and the power frequency current sensor respectively monitor zero-sequence voltage and zero-sequence current at respective positions;
step S3: when the power frequency voltage sensor monitors zero sequence voltage, the primary and secondary fusion switches calculate transient reactive power of the current position according to the monitored zero sequence voltage and zero sequence current;
step S4: determining a fault interval of a fault point according to transient reactive power calculated by the primary and secondary fusion switches;
step S5: and according to the determined fault interval, determining the traveling wave current transformer in the fault interval through the primary and secondary fusion switch, calling a traveling wave signal monitored by the traveling wave current transformer in the fault interval, and calculating the position of the fault point.
According to the method for positioning the fault of the intelligent switch fusion traveling wave of the power distribution network, the first-time fusion switch and the second-time fusion switch are subjected to targeted transformation, so that the transformed first-time fusion switch and the transformed second-time fusion switch have the purpose of accurately positioning the fault in the distributed power distribution network.
In this application embodiment, power frequency voltage sensor, power frequency current sensor, travelling wave current transformer monitor looks voltage, phase current, travelling wave phase current respectively, can a transient state that appears after the trouble takes place, transient state promptly, and power frequency voltage sensor, power frequency current sensor can monitor zero sequence voltage, zero sequence current's change this moment. In the embodiment of the application, the power frequency voltage sensor and the power frequency current sensor adopt an electronic three-phase current and voltage combined transformer.
When the power distribution network has a single-phase earth fault, a power frequency voltage sensor and a power frequency current sensor which are connected into the power distribution network monitor zero sequence voltage and zero sequence current in a transient state, an intelligent switch calculates the positive and negative of transient reactive power according to the monitored zero sequence voltage and zero sequence current, and if the transient reactive power is negative, the transient reactive power is indicated to flow to a bus from a circuit; the transient reactive power of the upstream section of the fault point is negative, and the transient reactive power is shown to flow to the bus from the line; the transient reactive power of the downstream section of the fault point is positive, and the transient reactive power is shown to flow to the line from the bus; wherein the position of the fault point of the unidirectional ground fault is between the upstream section and the downstream section;
after the fault interval is determined, the traveling wave signals monitored by the traveling wave current transformers in the fault interval are directly called, the number of calling objects is small and clear, the traveling wave signals monitored by all the traveling wave current transformers do not need to be filtered and subjected to impurity removal, and redundant calculation is avoided; the distance from the traveling wave current transformers to the fault point in the fault interval is the distance from the intelligent switch to the fault point, and the distance is short, so that the time for monitoring traveling wave signals is shorter, and the traveling wave signals are more convenient to monitor. Therefore, the traveling wave signals used for calculating the position of the fault point can be reliably acquired in the power distribution network, and the specific position of the fault can be quickly and accurately determined.
Referring to fig. 2, when a single-phase ground fault occurs, the intelligent switch calculates the positive and negative of the transient reactive power at each position, for example, on the line where the monitoring device No. 2, the monitoring device No. 10, and the monitoring device No. 11 are located, the transient reactive power calculated by the intelligent switch in the monitoring device No. 2 and the monitoring device No. 10 is negative, the transient reactive power calculated by the intelligent switch in the monitoring device No. 11 is positive, a fault point occurs between the monitoring device No. 10 and the monitoring device No. 11, and both ends of a fault interval are the monitoring device No. 10 and the monitoring device No. 11.
When the power distribution network has a short-circuit fault, the phase current change monitored by the power frequency current sensor exceeds a threshold value; when the power distribution network is in a normal state, the phase current monitored by the power frequency current sensor is not changed greatly. If the power distribution network has a short-circuit fault between phases, the phase current monitored by the power frequency current sensor in the upstream section of the fault point is changed greatly, and the phase current monitored by the power frequency current sensor in the downstream section of the fault point is not changed obviously. Therefore, the method and the device can also be used for positioning the short-circuit fault in the power distribution network.
As a preferred solution of the embodiment of the present application, after the intelligent switch calculates the transient reactive power of the current position according to the monitored zero-sequence voltage and zero-sequence current, the method further includes:
and controlling the intelligent switches to locally and closely isolate the fault point by adopting a fixed value setting range matching mode according to transient reactive power calculated by the intelligent switches.
In the embodiment of the application, the intelligent switches adopt a fixed value setting extreme difference matching mode according to the flow direction of the transient reactive power, multi-line multistage sectional isolation protection of the power distribution network is achieved, the local and nearby rapid isolation of fault points in a minimum fault area is ensured, transient faults can be detected, permanent faults can be detected, the fault maintenance safety and reliability are guaranteed, meanwhile, the power failure area on the power distribution network can be shortened to the minimum, and the economic loss is reduced.
Referring to fig. 2, when a single-phase ground fault occurs, the intelligent switch in the monitoring device calculates the positive and negative of the transient reactive power at each position in the power distribution network, for example, on the line where the No. 2 monitoring device, the No. 10 monitoring device, and the No. 11 monitoring device are located, the transient reactive power calculated by the intelligent switches in the No. 2 monitoring device and the No. 10 monitoring device is negative, the transient reactive power calculated by the intelligent switch in the No. 11 monitoring device is positive, the No. 2 monitoring device and the intelligent switches in the No. 10 monitoring device on the upstream section of the fault point commonly adopt a range matching mode of setting a fixed value, and the specific mode of locally and approximately isolating the fault point is as follows:
setting different time delay brake-off times when monitoring fault points for different intelligent switches on a line in advance, wherein the intelligent switch in No. 2 monitoring equipment delays 5s brake-off and then delays 1s reclosing; the intelligent switch in No. 10 monitoring equipment delays 3s for opening and then delays 4s for reclosing, the time for delaying opening of the intelligent switch in the monitoring equipment is the fixed value, and different delay times show extremely poor matching;
after the single-phase earth fault occurs, controlling the intelligent switch in the No. 10 monitoring equipment to be switched off in 3s, when the intelligent switch in the No. 10 monitoring equipment is switched off, the fault on a line cannot be detected, the intelligent switch in the No. 2 monitoring equipment does not need to be switched off in 5s, and when the intelligent switch in the No. 10 monitoring equipment is switched off in 7s, the intelligent switch in the No. 10 monitoring equipment is successfully switched on again; if the fault can not be detected after the intelligent switch in the No. 10 monitoring equipment is reclosed, the current single-phase earth fault is an instantaneous fault, and otherwise, the current single-phase earth fault is a permanent fault;
if the single-phase earth fault is a permanent fault, after the 7 th reclosing, the fault can be monitored on the line, the intelligent switch in the No. 10 monitoring equipment is tripped out quickly and closed by locking, and the downstream section of the No. 10 monitoring equipment is isolated, namely the smallest fault section is isolated in situ.
Assume that the point of failure is actually between monitoring device number 2 and monitoring device number 10 and is a permanent failure, while the failure we have calculated is between monitoring device number 10 and monitoring device number 11. After the single-phase earth fault occurs, controlling the intelligent switch in the No. 10 monitoring equipment to be switched off in the 3s, and when the intelligent switch in the No. 10 monitoring equipment is switched off, the intelligent switch in the No. 2 monitoring equipment can still monitor the fault on the line; the intelligent switch in the No. 2 monitoring equipment is switched off in the 5s, when the intelligent switch in the No. 2 monitoring equipment is switched off, the existence of a fault cannot be detected on a line, and the intelligent switch in the No. 2 monitoring equipment is successfully switched on; the intelligent switch in the No. 2 monitoring equipment is reclosed in the 6 th time, and at the moment, the existence of the fault is monitored on the circuit, so that the intelligent switch in the No. 2 monitoring equipment is quickly tripped and closed in a locking manner, the downstream section of the No. 2 monitoring equipment is isolated, and the in-situ isolated section is slightly larger than the minimum fault section.
In some embodiments, the specific step of determining, by the intelligent switch, a traveling wave current transformer in the fault section according to the determined fault section, and calling a traveling wave signal monitored by the traveling wave current transformer in the fault section, and calculating the position of the fault point includes:
according to the determined fault interval, the traveling wave current transformers on the upper and lower streams of the fault point in the fault interval are determined through the intelligent switch;
calling a traveling wave signal monitored by a traveling wave current transformer in the fault interval;
and calculating the position of the fault point according to the time difference of the traveling wave signals monitored by the traveling wave current transformers on the upper and lower streams of the fault point.
Further, the specific step of calculating the position of the fault point according to the time difference of the traveling wave signals monitored by the traveling wave current transformers on and downstream of the fault point is as follows:
collecting the time when all traveling wave current transformers in the fault interval monitor traveling wave signals;
comparing the collected moments of all traveling wave current transformers at the downstream of the fault point, and determining the traveling wave current transformer collected firstly;
and calculating the position of the fault point according to the time difference between the traveling wave current transformer at the upstream of the fault point and the time when the traveling wave current transformer which is firstly collected is determined to collect.
As shown in fig. 2, assuming that a fault point occurs between monitoring devices No. 1 and No. 4 and is close to monitoring device No. 4, the transient reactive power calculated by the intelligent switch in monitoring device No. 1 is negative, the transient reactive power calculated by the intelligent switch in monitoring device No. 4 is positive, and the transient reactive power calculated by the intelligent switch in monitoring device No. 5, No. 6, No. 7 is positive, then the fault interval is a T-type fault interval formed by monitoring devices No. 1, No. 4, No. 5, and the three monitoring devices are located on three boundaries of the T-type fault interval respectively. And the traveling wave current transformer in the No. 4 monitoring equipment monitors the traveling wave signal before the traveling wave current transformer in the No. 5 monitoring equipment, so the specific position of the fault point is calculated according to the time difference of the respective monitoring time of the traveling wave current transformers in the No. 1 monitoring equipment and the No. 4 monitoring equipment.
Furthermore, the calculation formula for calculating the position of the fault point according to the time difference between the traveling wave current transformer upstream of the fault point and the time when the traveling wave current transformer which is firstly collected is determined to be collected is as follows:
in the formula, L is the distance between two intelligent switches, L1Distance from fault point to intelligent switch upstream of fault point, L2Distance from fault point to intelligent switch downstream of fault point, t1Is the time, t, of the travelling-wave signal to the travelling-wave current transformer upstream of the fault point2And V is the propagation speed of the traveling wave in the power distribution network line at the moment when the traveling wave current reaches the traveling wave current transformer at the downstream of the fault point.
In the embodiment of the application, the interval between two adjacent intelligent switches is 5-10 km. Because the traveling wave current transformers are integrally installed on the intelligent switch, the distance between the traveling wave current transformers on two sides of a fault point in a fault interval is short, and traveling wave signals can be reliably monitored to be used for traveling wave positioning calculation. In the embodiment of the application, the interval between two adjacent intelligent switches is 5-6 km, namely the distance between two adjacent traveling wave current transformers is 5-6 km.
Meanwhile, the propagation speed of the traveling wave in the line is related to the medium around the wire, the magnetic permeability is 1 and the dielectric constant is 1 generally for the overhead line, the magnetic permeability is 1 and the dielectric constant is 3-5 generally for the cable line, and the calculation is carried out in the overhead line at 291-294 km/ms, generally 292 km/ms.
According to the embodiment of the application, the distribution condition of intelligent switches on a power distribution network is utilized, a power frequency voltage sensor, a power frequency current sensor and a traveling wave current transformer are integrated on the intelligent switches, the monitored zero sequence voltage is used as a trigger signal for fault location, and monitoring equipment can quickly monitor the zero sequence voltage and the zero sequence current and calculate transient reactive power when a single-phase earth fault occurs so as to quickly locate a fault interval of a fault point; after the fault interval is determined, directly calling a traveling wave signal monitored by a traveling wave current transformer in the fault interval to calculate the position of a fault point, and avoiding redundant calculation; and an intelligent switch in the monitoring equipment in the upstream section of the fault point is controlled to be close to an isolation minimum fault section, so that the fault maintenance safety and reliability are guaranteed, meanwhile, the power failure area on the power distribution network can be shortened to the minimum, and the economic loss is reduced.
The integrated power frequency voltage sensor of this application embodiment, power frequency current sensor, traveling wave current transformer combine intelligent switch in the position of distribution network on intelligent switch, can fix a position the position of fault interval and fault point fast to assist and carry out the in situ and near isolation measure with intelligent switch, can reach quick accurate ground location fault point, can also keep apart in situ to the minimum fault interval, improve the security that the distribution network overhauld.
As shown in fig. 3, an embodiment of the present application further provides a system for positioning a power distribution network intelligent switch fused with a traveling wave fault, which includes a terminal and a plurality of monitoring devices, where the monitoring devices include a power frequency voltage sensor, a power frequency current sensor, a traveling wave current transformer, and an intelligent switch, and the power frequency voltage sensor, the power frequency current sensor, and the traveling wave current transformer are integrated on the intelligent switch; the terminal is connected with all the intelligent switches, and the intelligent switches are connected with the power frequency voltage sensor, the power frequency current sensor and the traveling wave current transformer;
the monitoring devices are arranged at intervals according to the distribution condition of the power distribution network and are connected to the power distribution network;
the power frequency voltage sensor, the power frequency current sensor and the traveling wave current transformer are respectively used for monitoring voltage, current and traveling wave signals at respective positions;
the intelligent switch is used for obtaining parameter characteristic information of a corresponding position according to the monitored voltage or current;
the terminal is used for determining a fault section of a fault point according to the obtained parameter characteristic information of the corresponding position;
and the terminal is also used for determining a traveling wave current transformer in the fault interval through the intelligent switch according to the determined fault interval, calling a traveling wave signal monitored by the traveling wave current transformer in the fault interval and calculating the position of the fault point.
In the embodiment of the application, the distribution condition of intelligent switches on a power distribution network is utilized, a power frequency voltage sensor, a power frequency current sensor and a traveling wave current transformer are integrated on the intelligent switches, and a fault section of a fault point is quickly positioned on the basis of the distribution positions of the intelligent switches through a remote terminal and a plurality of monitoring devices according to the voltage and the current collected by the power frequency voltage sensor and the power frequency current sensor; and then, according to the fault section of the fault point, the traveling wave signal monitored by the traveling wave current transformer in the fault section is determined through the intelligent switch, and the specific position of the fault point is positioned by combining a traveling wave method, so that the positioning accuracy is improved.
In some embodiments, the intelligent switch is a two-shot fusion switch. In the embodiment of the application, the intelligent switch adopts a primary and secondary fusion switch, so that local information collection and rapid calculation can be realized, and rapid and accurate positioning of faults can be realized more rapidly and reliably.
When a single-phase earth fault occurs in the power distribution network, the voltage and the current monitored by the power frequency voltage sensor and the power frequency current sensor are respectively zero-sequence voltage and zero-sequence current, and the parameter characteristic information is transient reactive power; the system specifically comprises:
the power frequency voltage sensor and the power frequency current sensor are respectively used for monitoring zero sequence voltage and zero sequence current of respective positions;
the intelligent switch is used for calculating the transient reactive power of the current position according to the monitored zero sequence voltage and zero sequence current after the zero sequence voltage is monitored;
and the terminal is used for determining a fault interval of a fault point according to the transient reactive power calculated by the intelligent switches.
In the embodiment of the application, when a single-phase earth fault occurs, the zero-sequence voltage and the zero-sequence current are rapidly monitored, the monitored zero-sequence voltage is used as a trigger signal for fault positioning, the intelligent switch acquires the zero-sequence voltage and the zero-sequence current which are respectively monitored by a power frequency voltage sensor and a power frequency current sensor on the intelligent switch, transient reactive power is obtained through local calculation of the acquired zero-sequence voltage and zero-sequence current and is sent to a remote terminal, and a fault interval and the intelligent switch in the fault interval are determined through calculation processing of a plurality of transient reactive powers by the terminal; the traveling wave current transformer sends the monitored traveling wave signal to the terminal through the intelligent switch, the traveling wave signal received by the terminal is provided with a position information label of the intelligent switch, and then after the terminal determines a fault section of a fault point, the traveling wave signal in the fault section is called to calculate the position of the fault point. In the embodiment of the application, the terminal is a background for processing data. Therefore, the fault point can be quickly and accurately positioned, and redundant calculation is avoided.
In some embodiments, the intelligent switch is further configured to locally and closely isolate the fault point by using a fixed-value setting range-difference coordination manner according to the transient reactive power obtained through respective calculation. In the embodiment of the application, the intelligent switches adopt a fixed value setting extreme difference matching mode according to the flow direction of the transient reactive power, the fault points are isolated locally and nearby, transient faults can be detected, permanent faults can also be detected, the fault maintenance is safe and reliable, meanwhile, the power failure area on the power distribution network can be shortened to the minimum, and the economic loss is reduced.
Preferably, the interval between two adjacent intelligent switches is 5-10 km. Because the traveling wave current transformers are integrally installed on the intelligent switch, the distance between the traveling wave current transformers at two sides of a fault point in a determined fault interval is short, and traveling wave signals can be reliably monitored to be used for traveling wave positioning calculation.
The specific embodiment of the system for positioning the fault of the power distribution network intelligent switch fused traveling wave has been described in the specific embodiment of the method for positioning the fault of the power distribution network intelligent switch fused traveling wave, and is not repeated here.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for positioning a fault of a power distribution network intelligent switch fused with traveling waves is characterized by comprising the following steps:
according to the distribution condition of the power distribution network, a plurality of monitoring devices are arranged at intervals and connected to the power distribution network, each monitoring device comprises a power frequency voltage sensor, a power frequency current sensor, a traveling wave current transformer and an intelligent switch, and the power frequency voltage sensors, the power frequency current sensors and the traveling wave current transformers are integrated on the intelligent switches;
the power frequency voltage sensor and the power frequency current sensor monitor the voltage and the current at respective positions, and the traveling wave current transformer monitors traveling wave signals at respective positions;
according to the monitored voltage or current, parameter characteristic information of a corresponding position is obtained through the intelligent switch, and a fault interval of a fault point is determined;
and according to the determined fault interval, determining a traveling wave current transformer in the fault interval through the intelligent switch, calling a traveling wave signal monitored by the traveling wave current transformer in the fault interval, and calculating the position of the fault point.
2. The method of power distribution network intelligence switch fusion traveling wave fault location of claim 1, wherein the intelligence switch comprises a quadratic fusion switch.
3. The method for positioning fault of fusion traveling wave fault of intelligent switch of power distribution network according to claim 1, wherein the specific steps of determining the traveling wave current transformer in the fault section through the intelligent switch according to the determined fault section and calling the traveling wave signal monitored by the traveling wave current transformer in the fault section to calculate the position of the fault point comprise:
according to the determined fault interval, the traveling wave current transformers on the upper and lower streams of the fault point in the fault interval are determined through the intelligent switch;
calling a traveling wave signal monitored by a traveling wave current transformer in the fault interval;
and calculating the position of the fault point according to the time difference of the traveling wave signals monitored by the traveling wave current transformers on the upper and lower streams of the fault point.
4. The method for positioning the fault of the power distribution network intelligent switch fused with the traveling wave fault according to claim 3, wherein the specific step of calculating the position of the fault point according to the time difference of the traveling wave signals monitored by the traveling wave current transformers on the upstream and the downstream of the fault point comprises the following steps:
collecting the time when all traveling wave current transformers in the fault interval monitor traveling wave signals;
comparing the collected moments of all traveling wave current transformers at the downstream of the fault point, and determining the traveling wave current transformer collected firstly;
and calculating the position of the fault point according to the time difference between the traveling wave current transformer at the upstream of the fault point and the time when the traveling wave current transformer which is firstly collected is determined to collect.
5. The method for fault location of power distribution network intelligent switch fusion traveling wave according to claim 4, wherein the calculation formula for calculating the position of the fault point according to the time difference between the traveling wave current transformer upstream of the fault point and the time when the traveling wave current transformer which is firstly collected is determined is as follows:
in the formula, L is the distance between two intelligent switches, L1Distance from fault point to intelligent switch upstream of fault point, L2Distance from fault point to intelligent switch downstream of fault point, t1Is the time, t, of the travelling-wave signal to the travelling-wave current transformer upstream of the fault point2And V is the propagation speed of the traveling wave in the power distribution network line at the moment when the traveling wave current reaches the traveling wave current transformer at the downstream of the fault point.
6. The method for fault location of power distribution network intelligent switch fusion traveling wave according to claim 1, wherein when a single-phase ground fault occurs in the power distribution network, the voltage and current monitored by the power frequency voltage sensor and the power frequency current sensor are zero-sequence voltage and zero-sequence current, respectively, and the parameter characteristic information is transient reactive power, and the method specifically comprises the following steps:
the power frequency voltage sensor and the power frequency current sensor respectively monitor zero sequence voltage and zero sequence current at respective positions;
after the zero sequence voltage is monitored, the intelligent switch calculates the transient reactive power of the current position according to the monitored zero sequence voltage and zero sequence current;
and determining a fault interval of a fault point according to the transient reactive power calculated by the intelligent switches.
7. The method for fault location of power distribution network intelligent switch fusion traveling wave according to claim 6, wherein after the intelligent switch calculates the transient reactive power of the current position according to the monitored zero sequence voltage and zero sequence current, the method further comprises:
and controlling the intelligent switches to locally and closely isolate the fault point by adopting a fixed value setting range matching mode according to transient reactive power calculated by the intelligent switches.
8. A system for positioning a power distribution network intelligent switch fusion traveling wave fault is characterized by comprising a terminal and a plurality of monitoring devices, wherein each monitoring device comprises a power frequency voltage sensor, a power frequency current sensor, a traveling wave current transformer and an intelligent switch, and the power frequency voltage sensor, the power frequency current sensor and the traveling wave current transformer are integrated on the intelligent switch; the terminal is connected with all the intelligent switches, and the intelligent switches are connected with the power frequency voltage sensor, the power frequency current sensor and the traveling wave current transformer;
the monitoring devices are arranged at intervals according to the distribution condition of the power distribution network and are connected to the power distribution network;
the power frequency voltage sensor, the power frequency current sensor and the traveling wave current transformer are respectively used for monitoring voltage, current and traveling wave signals at respective positions;
the intelligent switch is used for obtaining parameter characteristic information of a corresponding position according to the monitored voltage or current;
the terminal is used for determining a fault section of a fault point according to the obtained parameter characteristic information of the corresponding position;
and the terminal is also used for determining a traveling wave current transformer in the fault interval through the intelligent switch according to the determined fault interval, calling a traveling wave signal monitored by the traveling wave current transformer in the fault interval and calculating the position of the fault point.
9. The system for power distribution network intelligent switch fusion traveling wave fault location according to claim 8, wherein when a single-phase earth fault occurs in the power distribution network, the voltage and current monitored by the power frequency voltage sensor and the power frequency current sensor are zero-sequence voltage and zero-sequence current respectively, and the parameter characteristic information is transient reactive power; the system specifically comprises:
the power frequency voltage sensor and the power frequency current sensor are respectively used for monitoring zero sequence voltage and zero sequence current of respective positions;
the intelligent switch is used for calculating the transient reactive power of the current position according to the monitored zero sequence voltage and zero sequence current after the zero sequence voltage is monitored;
and the terminal is used for determining a fault interval of a fault point according to the transient reactive power calculated by the intelligent switches.
10. The system for fault location of power distribution network intelligence switch fusion traveling wave according to claim 9, wherein the intelligence switch is further configured to locally isolate the fault point based on the transient reactive power calculated by each of the intelligence switches by using a fixed-value-set range-difference coordination.
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