CN108964001B - Power distribution network arc suppression coil tuning method, terminal equipment and system - Google Patents
Power distribution network arc suppression coil tuning method, terminal equipment and system Download PDFInfo
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Abstract
The invention is suitable for the technical field of power distribution networks, and provides a power distribution network arc suppression coil tuning method, terminal equipment and a system, wherein the method comprises the following steps: acquiring neutral point voltage of the power distribution network; when the neutral point voltage is larger than a first preset threshold value, determining the capacitance current of the power distribution network; and determining the target coil turn number of the arc suppression coil according to the neutral point voltage and the capacitance current, and adjusting the arc suppression coil to the target coil turn number. The invention can improve the tuning precision.
Description
Technical Field
The invention belongs to the technical field of power distribution networks, and particularly relates to a power distribution network arc suppression coil tuning method, terminal equipment and system.
Background
The power distribution network is an important link in power generation, transformation, transmission and distribution of electric energy of a power system, is a bridge for connecting a power transmission system and power users, and is directly related to requirements of the users on the aspects of electric energy safety, quality, economy and the like. However, with the development of power networks, cables in power distribution networks are increased and lengthened, when a single-phase earth fault occurs, capacitance current is increased, and the problem of arc overvoltage caused by the capacitance current is also increased, so that the safe and reliable operation of a power system is directly threatened. At present, the purpose of arc extinction is achieved by a grounding mode that a neutral point is grounded through an arc suppression coil, and when a single-phase grounding fault occurs in a power grid, the arc suppression coil can provide inductive current, compensate grounding capacitance current of a power distribution network, and achieve the purposes of reducing grounding residual current and extinguishing electric arcs.
At present, the arc extinguishing effect is achieved by manually adjusting the arc extinguishing coil by workers, but the method is low in reliability and safe.
Disclosure of Invention
In view of this, the embodiment of the invention provides a power distribution network arc suppression coil tuning method, terminal equipment and a system, so as to solve the problem that in the prior art, the reliability of manual adjustment of an arc suppression coil by a worker is low.
The first aspect of the embodiment of the invention provides a power distribution network arc suppression coil tuning method, which comprises the following steps:
acquiring neutral point voltage of the power distribution network;
when the neutral point voltage is larger than a first preset threshold value, determining the capacitance current of the power distribution network;
and determining the target coil turn number of the arc suppression coil according to the neutral point voltage and the capacitance current, and adjusting the arc suppression coil to the target coil turn number.
In a first implementation, the adjusting the arc suppression coil to the target coil turn number includes:
acquiring a corresponding relation list of the number of turns of the arc suppression coil and the gear;
and acquiring a target gear corresponding to the number of turns of the target coil according to the corresponding relation list, and adjusting the arc suppression coil to the target gear.
With reference to the first implementation manner, in a second implementation manner, the acquiring, according to the correspondence list, a target gear corresponding to the number of turns of the target coil includes:
and acquiring the absolute value of the difference between the number of turns of the coil in the corresponding relation list and the number of turns of the target coil, and taking the gear corresponding to the number of turns of the coil with the minimum absolute value of the difference between the number of turns of the target coil as a target gear.
In a third implementation, the determining a target number of coil turns for a crowbar coil based on the neutral voltage and the capacitance current includes:
according to the expression
Or
Determining the target coil turn number N, wherein U0Is neutral point voltage, IcIs a capacitance current, RdThe resistance value of a damping resistance box connected with the arc suppression coil is set; x0And the reactance value of one turn of coil in the arc suppression coil is obtained.
In a fourth implementation, the determining the capacitive current of the power distribution network includes:
obtaining the current reactance value X of the arc suppression coilL1Current value IL1And the current phase angle thetaL1；
Adjusting the number of turns of the arc suppression coil to be a first number of turns of the arc suppression coil, and acquiring an adjusted reactance value X of the arc suppression coilL2Adjusting the current value IL2And adjusting the phase angle thetaL2；
According to the expression
Determining a capacitive current I of the power distribution networkcWherein, UΦIs the nominal voltage, R, of the distribution networkdIs the resistance value of a damping resistance box connected with the arc suppression coil,
in a fifth implementation manner, the method further includes:
obtaining the maximum capacitance current I of the power distribution networkcmaxAnd a nominal voltage UΦ；
According to the expression
Determining a resistance value R of the damping resistor boxdWherein, K isC0For the asymmetry, U, of the distribution network0maxIs the maximum neutral point voltage, U, of the distribution network0max＝kUΦK is a coefficient;
setting the resistance value of a damping resistance box connected with the arc suppression coil as Rd。
In a sixth implementation manner, the method further includes:
acquiring three-phase voltage of the power distribution network;
and when any phase voltage in the three-phase voltages is smaller than a second preset threshold value, the damping resistance box connected with the arc suppression coil is in short circuit connection.
A second aspect of an embodiment of the present invention provides a power distribution network arc suppression coil tuning terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method according to the first aspect of the embodiment of the present invention when executing the computer program.
A third aspect of the embodiments of the present invention provides a power distribution network arc suppression coil tuning system, which is characterized by including:
a control module;
the arc suppression coil is connected with the power distribution network;
the voltage measuring module is used for measuring the voltage of the neutral point of the power distribution network;
the current measuring module is used for measuring the current of the arc suppression coil;
a damping resistance box;
the control module is respectively connected with the arc suppression coil, the voltage measuring module, the current measuring module and the damping resistance box; the arc suppression coil is respectively connected with the current measuring module and the damping resistance box; the voltage measuring module is connected with the power distribution network.
The control module is adapted to perform the steps of the method according to the first aspect of the embodiment of the present invention.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the embodiment of the invention judges whether tuning is needed or not through the neutral point voltage of the power distribution network, determines the capacitance current of the power distribution network when tuning is needed, determines the number of turns of the target coil of the arc suppression coil according to the neutral point voltage and the capacitance current, and adjusts the number of turns of the target coil of the arc suppression coil, thereby realizing automatic tuning of the arc suppression coil.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a power distribution network arc suppression coil tuning system provided by an embodiment of the invention;
fig. 2 is a schematic flow chart of an implementation of a power distribution network arc suppression coil tuning method provided by an embodiment of the invention;
fig. 3 is a schematic flow chart of an implementation of step S203 provided in the embodiment of the present invention;
fig. 4 is a schematic flow chart of an implementation of step S202 according to the present invention;
fig. 5 is a schematic diagram of a power distribution network arc suppression coil tuning device provided by the embodiment of the invention;
fig. 6 is a schematic diagram of a power distribution network arc suppression coil tuning terminal device provided by the embodiment of the invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, fig. 1 is a schematic diagram of a power distribution network arc suppression coil tuning system according to an embodiment of the present invention, and the power distribution network arc suppression coil tuning system 100 includes a control module 101, an arc suppression coil 102, a voltage measurement module 103, a current measurement module 104, and a damping resistor box 105.
The arc suppression coil 102 is connected with the control module 101, the arc suppression coil 102 is a turn-adjusting arc suppression coil and is provided with a multi-level tap, and the number of turns of the on-load tap changer is controlled by the control module 101. The arc suppression coil 102 is connected to a neutral point of the power distribution network, and in the neutral-point-free grounded power distribution network, the arc suppression coil 102 is connected to the power distribution network through a grounding transformer module. Each phase of the grounding transformer module consists of two series-connected sub-windings with the same number of turns. The transformer winding is Z-connection and has the characteristics of low zero-sequence impedance, large resistance to excitation, low power consumption and the like.
The voltage measurement module 103 is a voltage transformer, and is connected to the control module 101 and the power distribution network, respectively, and in the neutral point-free grounded power distribution network, the voltage measurement module 103 is connected to the power distribution network through a grounding transformer module. The voltage measuring module is used for measuring the neutral point voltage of the power distribution network, namely the voltage of the arc suppression coil 102, and sending the measured neutral point voltage to the control module 101.
The current measuring module 104 is a current transformer, is connected in series with the arc suppression coil 102, and is configured to measure a current of the arc suppression coil 102 and send the measured current to the control module 101.
The damping resistance box 105 is connected in series to the grounding side of the arc suppression coil 102 and is used for preventing the arc suppression coil from generating resonance during turn adjustment so as to meet the requirement that neutral point displacement voltage is not more than 15% of rated phase voltage when a power grid normally operates. When a single-phase earth fault occurs, the control module 101 quickly short-circuits the damping resistance box 105 to prevent the damping resistance box 105 from increasing active components in residual current and generating heat, which adversely affects the extinguishing of electric arcs.
The control module 101 is respectively connected with the arc suppression coil 102, the voltage measurement module 103, the current measurement module 104 and the damping resistor box 105, and is used for tuning the arc suppression coil 102. The control module 101 may also be connected to a human-machine interaction module for displaying tuning information.
Referring to fig. 2, fig. 2 is a schematic diagram of an implementation flow of a power distribution network arc suppression coil tuning method provided by an embodiment of the present invention, and is applied to the control module 101 shown in fig. 1, where the method includes the following steps:
step S201, acquiring neutral point voltage of the power distribution network.
In the embodiment of the invention, the voltage measuring module measures the neutral point voltage of the power distribution network in real time or at preset time intervals, and after the voltage measuring module measures the neutral point voltage, the measured neutral point voltage is sent to the control module. The voltage measurement module sends the neutral point voltage to the control module through the wireless transmission module, or the voltage measurement module is electrically connected with the control module, and the voltage measurement module sends the neutral point voltage to the control module through a wired transmission mode.
Step S202, when the neutral point voltage is larger than a first preset threshold value, determining the capacitance current of the power distribution network.
In the embodiment of the invention, after the control module obtains the neutral point voltage, the neutral point voltage is compared with a first preset threshold value, wherein the first preset threshold value is a neutral point voltage value needing tuning, when the neutral point voltage is greater than the first preset threshold value, it is judged that the arc cancellation coil needs tuning, and then the control module determines the capacitance current of the power distribution network.
And S203, determining the number of target coil turns of the arc suppression coil according to the neutral point voltage and the capacitance current, and adjusting the number of the target coil turns of the arc suppression coil.
In the embodiment of the invention, the control module determines the target coil turns of the arc suppression coil according to the neutral point voltage and the capacitance current, and adjusts the turns of the arc suppression coil to the target coil turns, so that the current of the arc suppression coil supplements the capacitance current, and automatic tuning is realized.
The embodiment of the invention judges whether tuning is needed or not through the neutral point voltage of the power distribution network, determines the capacitance current of the power distribution network when tuning is needed, determines the number of turns of the target coil of the arc suppression coil according to the neutral point voltage and the capacitance current, and adjusts the number of turns of the target coil of the arc suppression coil, thereby realizing automatic tuning of the arc suppression coil.
In the embodiment of the present invention, as shown in fig. 3, the adjusting the arc suppression coil to the target coil turn number in step S203 includes the following steps:
and S301, acquiring a corresponding relation list of the number of turns of the arc suppression coil and the gear.
In the embodiment of the invention, the arc suppression coil is provided with multi-level tap taps, namely multi-level gears, different gears correspond to different coil turns, and the control module acquires a corresponding relation list of the coil turns and the gears. In another implementation mode, a corresponding relation list of the number of turns of the coils and the gears of various arc suppression coils is stored in a memory, the control module obtains identification information of the arc suppression coils, and searches and obtains the corresponding relation list from the memory according to the identification information, wherein the identification information is the names or identification numbers of the arc suppression coils.
Step S302, a target gear corresponding to the number of turns of the target coil is obtained according to the corresponding relation list, and the arc suppression coil is adjusted to the target gear.
In the embodiment of the invention, the control module acquires the target gear from the corresponding relation list according to the number of turns of the target coil and controls the on-load tap-changer of the arc suppression coil to adjust the arc suppression coil to the target gear.
As an embodiment of the present invention, in step S302, the obtaining a target gear corresponding to the number of target coil turns according to the correspondence list includes: and acquiring the absolute value of the difference between the number of turns of the coil in the corresponding relation list and the number of turns of the target coil, and taking the gear corresponding to the number of turns of the coil with the minimum absolute value of the difference between the number of turns of the target coil as a target gear.
In the embodiment of the invention, the control module calculates the absolute value of the difference between each coil turn number and the target coil turn number in the corresponding relation list, sorts the absolute values of the differences, selects the minimum absolute value of the difference, and takes the corresponding gear as the target gear.
As an embodiment of the present invention, the determining a target number of turns of the arc suppression coil according to the neutral point voltage and the capacitance current in step S203 includes:
according to the expression
Or
Determining the target coil turn number N, wherein U0Is neutral point voltage, IcIs a capacitance current, RdThe resistance value of a damping resistance box connected with the arc suppression coil is set; x0And the reactance value of one turn of coil in the arc suppression coil is obtained.
Referring to fig. 4, as an embodiment of the present invention, the determining the capacitance current of the power distribution network in step S202 includes the following steps:
step S401, obtaining the current reactance value X of the arc suppression coilL1Current value IL1And the current phase angle thetaL1。
In the embodiment of the invention, the number of turns of the coil of the arc suppression coil which is currently connected to the power distribution network is obtained, and the current reactance value X is determined according to the number of turns of the currently connected coilL1Measuring the current value I of the arc suppression coil by a current measuring moduleL1Current phase angle thetaL1The phase angle of the voltage measured by the voltage measuring module or the phase angle of the current measured by the current measuring module.
Step S402, adjusting the number of turns of the arc suppression coil to be the first number of turns of the coil, and obtaining the adjusted reactance value X of the arc suppression coilL2Adjusting the current value IL2And adjusting the phase angle thetaL2。
In the embodiment of the invention, the control module controls the on-load tap-changer to randomly adjust the turn number of the arc suppression coil to the first coil turn number so as to change the inductance of the arc suppression coil. Determining an adjusted reactance value X based on the number of first coil turnsL2Measuring the regulated current value I of the arc suppression coil by a current measuring moduleL2At the current phase angle thetaL1For the phase angle of the voltage, the phase angle theta is adjustedL2For the phase angle of the voltage measured by the voltage measuring module, at the present phase angle thetaL1For the phase angle of the current, the phase angle theta is adjustedL2Is the phase angle of the current measured by the current measurement module.
Step S403, according to the expression
Determining a capacitive current I of the power distribution networkc. Wherein, UΦIs the nominal voltage, R, of the distribution networkdIs the resistance value of a damping resistance box connected with the arc suppression coil,
as an embodiment of the present invention, the method further comprises: obtaining the maximum capacitance current I of the power distribution networkcmaxAnd a nominal voltage UΦ(ii) a According to the expression
Determining a resistance value R of the damping resistor boxdWherein, K isC0For the asymmetry, U, of the distribution network0maxIs the maximum neutral point voltage, U, of the distribution network0max＝kUΦK is a coefficient; setting the resistance value of a damping resistance box connected with the arc suppression coil as Rd。
In the embodiment of the invention, the staff uses the human-computer interaction module to convert the maximum capacitance current I of the power distribution networkcmaxAnd a nominal voltage UΦInput to the control module. The asymmetry of the distribution network may be 2.5%. Maximum neutral point voltage U of power distribution network0max＝kUΦAnd k may be 15%. The control module calculates the resistance value R of the damping resistance boxdThen, the resistance value of the damping resistance box is adjusted to Rd。
As an embodiment of the present invention, the method further comprises: acquiring three-phase voltage of the power distribution network; and when any phase voltage in the three-phase voltages is smaller than a second preset threshold value, the damping resistance box connected with the arc suppression coil is in short circuit connection.
In the embodiment of the invention, the second preset threshold is used for judging whether the power distribution network has the single-phase ground fault, and when the single-phase ground fault is judged to occur when the three-phase voltage is less than the second preset threshold and only one-phase voltage is less than the second preset threshold, the control module is in short circuit with the damping resistance box through the relay, so that the damping resistance box is out of work.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Referring to fig. 5, fig. 5 is a schematic diagram of a power distribution network arc suppression coil tuning device according to an embodiment of the present invention, where the power distribution network arc suppression coil tuning device includes an obtaining unit 501, a determining unit 502, and an adjusting unit 503, and functions of each unit are as follows:
an obtaining unit 501, configured to obtain a neutral point voltage of a power distribution network;
a determining unit 502, configured to determine a capacitance current of the power distribution network when the neutral point voltage is greater than a first preset threshold;
an adjusting unit 503, configured to determine a target coil turn number of the arc suppression coil according to the neutral point voltage and the capacitance current, and adjust the arc suppression coil to the target coil turn number.
As an embodiment of the present invention, the adjusting unit 503 is configured to obtain a corresponding relationship list between the number of turns of the arc suppression coil and the gear;
and acquiring a target gear corresponding to the number of turns of the target coil according to the corresponding relation list, and adjusting the arc suppression coil to the target gear.
As an embodiment of the present invention, the adjusting unit 503 is configured to obtain an absolute value of a difference between the number of turns of the coil in the correspondence list and the target number of turns of the coil, and take a shift corresponding to the number of turns of the coil with the smallest absolute value of the difference between the number of turns of the target coil as the target shift.
As an embodiment of the present invention, the adjusting unit 503 is configured to adjust the value according to the expression
Or
Determining the target coil turn number N, wherein U0Is neutral point voltage, IcIs a capacitance current, RdThe resistance value of a damping resistance box connected with the arc suppression coil is set; x0And the reactance value of one turn of coil in the arc suppression coil is obtained.
As an embodiment of the present invention, a determining unit 502 is used for obtaining the current reactance value X of the arc suppression coilL1Current value IL1And the current phase angle thetaL1；
Adjusting the number of turns of the arc suppression coil to be a first number of turns of the arc suppression coil, and acquiring an adjusted reactance value X of the arc suppression coilL2Adjusting the current value IL2And adjusting the phase angle thetaL2；
According to the expression
Determining a capacitive current I of the power distribution networkcWherein, UΦIs the nominal voltage, R, of the distribution networkdIs the resistance value of a damping resistance box connected with the arc suppression coil,
as an embodiment of the present invention, the adjusting unit 503 is further configured to obtain a maximum capacitance current I of the power distribution networkcmaxAnd a nominal voltage UΦ；
According to the expression
Determining a resistance value R of the damping resistor boxdWherein, K isC0For the asymmetry, U, of the distribution network0maxIs the maximum neutral point voltage, U, of the distribution network0max＝kUΦK is a coefficient;
setting the resistance value of a damping resistance box connected with the arc suppression coil as Rd。
As an embodiment of the present invention, the present invention further includes a short circuit module, configured to obtain a three-phase voltage of the power distribution network;
and when any phase voltage in the three-phase voltages is smaller than a second preset threshold value, the damping resistance box connected with the arc suppression coil is in short circuit connection.
The embodiment of the invention judges whether tuning is needed or not through the neutral point voltage of the power distribution network, determines the capacitance current of the power distribution network when tuning is needed, determines the number of turns of the target coil of the arc suppression coil according to the neutral point voltage and the capacitance current, and adjusts the number of turns of the target coil of the arc suppression coil, thereby realizing automatic tuning of the arc suppression coil.
Fig. 6 is a schematic diagram of a power distribution network arc suppression coil tuning terminal device according to an embodiment of the present invention. As shown in fig. 6, the distribution network arc suppression coil tuning terminal apparatus 600 of this embodiment includes: a processor 601, a memory 602, and a computer program 603 stored in said memory 602 and executable on said processor 601. The processor 601, when executing the computer program 603, implements the steps in each of the above-described embodiments of the power distribution network arc suppression coil tuning method, such as steps S101 to S103 shown in fig. 1. Alternatively, the processor 601, when executing the computer program 603, implements the functions of each module/unit in each device embodiment described above, for example, the functions of the units 501 to 503 shown in fig. 5.
Illustratively, the computer program 603 may be partitioned into one or more modules/units that are stored in the memory 602 and executed by the processor 601 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 603 in the power distribution network arc suppression coil tuning terminal apparatus 600. For example, the computer program 603 may be divided into an acquisition unit, a determination unit and an adjustment unit, each unit functioning as follows:
the acquisition unit is used for acquiring the neutral point voltage of the power distribution network;
the determining unit is used for determining the capacitance current of the power distribution network when the neutral point voltage is larger than a first preset threshold value;
and the adjusting unit is used for determining the target coil turns of the arc suppression coil according to the neutral point voltage and the capacitance current and adjusting the arc suppression coil to the target coil turns.
As an embodiment of the present invention, the adjusting unit is configured to obtain a corresponding relationship list between the number of turns of the arc suppression coil and the gear;
and acquiring a target gear corresponding to the number of turns of the target coil according to the corresponding relation list, and adjusting the arc suppression coil to the target gear.
As an embodiment of the present invention, the adjusting unit is configured to obtain an absolute value of a difference between the number of turns of the coil in the correspondence list and the target number of turns of the coil, and take a shift corresponding to the number of turns of the coil having the smallest absolute value of the difference between the number of turns of the target coil as the target shift.
As an embodiment of the invention, an adjustment unit for adjusting the adjustment unit according to the expression
Or
Determining the target coil turn number N, wherein U0Is neutral point voltage, IcIs a capacitance current, RdThe resistance value of a damping resistance box connected with the arc suppression coil is set; x0And the reactance value of one turn of coil in the arc suppression coil is obtained.
As an embodiment of the present invention, a determination unit is used for obtaining the current reactance value X of the arc suppression coilL1Current value IL1And the current phase angle thetaL1；
Adjusting the number of turns of the arc suppression coil to be a first number of turns of the arc suppression coil, and acquiring an adjusted reactance value X of the arc suppression coilL2Adjusting the current value IL2And adjusting the phase angle thetaL2；
According to the expression
Determining a capacitive current I of the power distribution networkcWherein, UΦIs the nominal voltage, R, of the distribution networkdIs the resistance value of a damping resistance box connected with the arc suppression coil,
as an embodiment of the invention, the regulating unit is further configured to obtain a maximum capacitive current I of the power distribution networkcmaxAnd a nominal voltage UΦ；
According to the expression
Determining a resistance value R of the damping resistor boxdWherein, K isC0For the asymmetry, U, of the distribution network0maxIs the maximum neutral point voltage, U, of the distribution network0max＝kUΦK is a coefficient;
setting the resistance value of a damping resistance box connected with the arc suppression coil as Rd。
As an embodiment of the present invention, the present invention further includes a short circuit module, configured to obtain a three-phase voltage of the power distribution network;
and when any phase voltage in the three-phase voltages is smaller than a second preset threshold value, the damping resistance box connected with the arc suppression coil is in short circuit connection.
The distribution network arc suppression coil tuning terminal device 600 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The power distribution network arc suppression coil tuning terminal equipment can include, but is not limited to, a processor 601 and a memory 602. Those skilled in the art will appreciate that fig. 6 is merely an example of a power distribution network crowbar coil tuning terminal apparatus 600, and does not constitute a limitation of the power distribution network crowbar coil tuning terminal apparatus 600, and may include more or fewer components than shown, or some components in combination, or different components, for example, the power distribution network crowbar coil tuning terminal apparatus may also include input-output devices, network access devices, buses, etc.
The Processor 601 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 602 may be an internal storage unit of the power distribution network arc suppression coil tuning terminal device 600, such as a hard disk or a memory of the power distribution network arc suppression coil tuning terminal device 600. The memory 602 may also be an external storage device of the power distribution network arc suppression coil tuning terminal device 600, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are equipped on the power distribution network arc suppression coil tuning terminal device 600. Further, the memory 602 may also include both an internal memory unit and an external memory device of the power distribution network arc suppression coil tuning terminal apparatus 600. The memory 602 is used to store the computer program and other programs and data required by the power distribution network arc suppression coil tuning terminal equipment. The memory 602 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of 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 place, or may be distributed on a plurality of 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 modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; 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; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (9)
1. A power distribution network arc suppression coil tuning method is characterized by comprising the following steps:
acquiring neutral point voltage of the power distribution network;
when the neutral point voltage is larger than a first preset threshold value, determining the capacitance current of the power distribution network; wherein the determining the capacitive current of the power distribution network comprises: obtaining the current reactance value X of the arc suppression coilL1Current value IL1And the current phase angle thetaL1(ii) a Adjusting the number of turns of the arc suppression coil to be a first number of turns of the arc suppression coil, and acquiring an adjusted reactance value X of the arc suppression coilL2Adjusting the current value IL2And adjusting the phase angle thetaL2(ii) a According to the expression
Determining a capacitive current I of the power distribution networkcWherein, UΦIs the nominal voltage, R, of the distribution networkdIs the resistance value of a damping resistance box connected with the arc suppression coil,
and determining the target coil turn number of the arc suppression coil according to the neutral point voltage and the capacitance current, and adjusting the arc suppression coil to the target coil turn number.
2. A method of tuning a power distribution network arc suppression coil as recited in claim 1, wherein said adjusting said arc suppression coil to said target number of coil turns comprises:
acquiring a corresponding relation list of the number of turns of the arc suppression coil and the gear;
and acquiring a target gear corresponding to the number of turns of the target coil according to the corresponding relation list, and adjusting the arc suppression coil to the target gear.
3. The power distribution network arc suppression coil tuning method of claim 2, wherein the obtaining of the target gear corresponding to the target coil turns according to the correspondence list comprises:
and acquiring the absolute value of the difference between the number of turns of the coil in the corresponding relation list and the number of turns of the target coil, and taking the gear corresponding to the number of turns of the coil with the minimum absolute value of the difference between the number of turns of the target coil as a target gear.
4. A power distribution network arc suppression coil tuning method as recited in claim 1, wherein said determining a target number of turns for an arc suppression coil based on said neutral voltage and said capacitive current comprises:
according to the expression
Determining the target coil turn number N, wherein U0Is neutral point voltage, IcIs a capacitance current, RdThe resistance value of a damping resistance box connected with the arc suppression coil is set; x0And the reactance value of one turn of coil in the arc suppression coil is obtained.
5. A method of tuning a crowbar coil for a power distribution network as recited in claim 1, further comprising:
obtaining the maximum capacitance current I of the power distribution networkcmaxAnd a nominal voltage UΦ；
According to the expression
Determining a resistance value R of a damping resistor box connected with the arc suppression coildWherein, K isC0For the asymmetry, U, of the distribution network0maxIs the maximum neutral point voltage, U, of the distribution network0max＝kUΦAnd k is a coefficient.
6. A method of tuning a crowbar coil for a power distribution network as recited in claim 1, further comprising:
acquiring three-phase voltage of the power distribution network;
and when any phase voltage in the three-phase voltages is smaller than a second preset threshold value, the damping resistance box connected with the arc suppression coil is in short circuit connection.
7. A power distribution network crowbar coil tuning terminal device comprising a memory, a processor and a computer program stored in said memory and executable on said processor, characterized in that said processor implements the steps of the method according to any one of claims 1 to 6 when executing said computer program.
8. A distribution network arc suppression coil tuning system, characterized by includes:
a control module;
the arc suppression coil is connected with the power distribution network;
the voltage measuring module is used for measuring the voltage of the neutral point of the power distribution network;
the current measuring module is used for measuring the current of the arc suppression coil;
a damping resistance box;
the control module is respectively connected with the arc suppression coil, the voltage measuring module, the current measuring module and the damping resistance box; the arc suppression coil is respectively connected with the current measuring module and the damping resistance box; the voltage measuring module is connected with the power distribution network;
the control module is adapted to perform the steps of the method according to any of claims 1 to 6.
9. A power distribution network arc suppression coil tuning system as recited in claim 8, further comprising:
and the arc suppression coil and the voltage measurement module are respectively connected with the power distribution network through the grounding transformer module.
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| CN201810972666.1A CN108964001B (en) | 2018-08-24 | 2018-08-24 | Power distribution network arc suppression coil tuning method, terminal equipment and system |
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| CN201810972666.1A CN108964001B (en) | 2018-08-24 | 2018-08-24 | Power distribution network arc suppression coil tuning method, terminal equipment and system |
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| CN203674711U (en) * | 2013-12-31 | 2014-06-25 | 国家电网公司 | Automatic tracking and compensating device for arc-suppression coil of power distribution network |
| CN104730414A (en) * | 2015-01-28 | 2015-06-24 | 合肥天海电气技术有限公司 | Circuit selecting device and method for single-phase grounding of resonance grounding system |
| CN104901299A (en) * | 2015-06-19 | 2015-09-09 | 安徽马尼特合开电器有限公司 | Resonant grounding system automatic tracking and compensating device and method |
| CN107611958A (en) * | 2017-08-11 | 2018-01-19 | 国网新源水电有限公司新安江水力发电厂 | Automatic tracking and compensating arc distinction system for generator neutral point |
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| CN203674711U (en) * | 2013-12-31 | 2014-06-25 | 国家电网公司 | Automatic tracking and compensating device for arc-suppression coil of power distribution network |
| CN104730414A (en) * | 2015-01-28 | 2015-06-24 | 合肥天海电气技术有限公司 | Circuit selecting device and method for single-phase grounding of resonance grounding system |
| CN104901299A (en) * | 2015-06-19 | 2015-09-09 | 安徽马尼特合开电器有限公司 | Resonant grounding system automatic tracking and compensating device and method |
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Application publication date: 20181207 Assignee: BAODING HUACHUANG ELECTRIC Co.,Ltd. Assignor: STATE GRID HEBEI ENERGY TECHNOLOGY SERVICE Co.,Ltd. Contract record no.: X2021130000003 Denomination of invention: Tuning method, terminal equipment and system of arc suppression coil in distribution network Granted publication date: 20200421 License type: Common License Record date: 20210305 |