CN117293771A - Method and device for suppressing switching-on inrush current of power distribution network switch and electronic equipment - Google Patents
Method and device for suppressing switching-on inrush current of power distribution network switch and electronic equipment Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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Abstract
The invention discloses a method and a device for inhibiting switching-on inrush current of a power distribution network switch, electronic equipment and a storage medium, wherein the method comprises the following steps: the intelligent feeder terminal samples the voltage and the current of the power distribution network line in real time to obtain an instantaneous sampled data value; comparing the sampled data values with a preset overcurrent protection threshold one by one, triggering an inertia logic signal under the condition that the sampled data values are larger than the positive value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to be 1, and performing falling edge hysteresis judgment to obtain a switch control signal; and sending a switch control signal to a switch controller; and the switch controller responds to the switch control signal every other preset processing period to perform protection judgment processing on the power distribution network switch, and controls the power distribution network switch to perform corresponding protection action to cut off faults. The embodiment of the invention can perform the switch protection action of the power distribution network with higher accuracy, thereby improving the reliability of power supply of the power distribution network.
Description
Technical Field
The invention relates to the technical field of relay protection of medium-voltage distribution networks, in particular to a method and a device for suppressing switching-on inrush current of a distribution network switch and electronic equipment.
Background
The switching on inrush current phenomenon existing in the medium voltage distribution network line of the power system brings a plurality of hazards and risks, for example: the switching-on surge current can cause instant overcurrent and damage hardware equipment; the switching-on inrush current can cause the protection device to be erroneously identified to perform power-off and tripping operations, and finally the normal operation of equipment and lines is affected; the high frequency and instantaneous harmonic high current of the switching inrush current may cause frequent protection actions, reducing the reliability of the power system. Therefore, the suppression of the switching-on inrush current of the power distribution network switch has great significance for the safe and stable operation of the power system.
In the related art, the adopted switching-on inrush current method mainly comprises the following steps: transformer entrance compensation, even harmonic suppression, etc. However, when the even harmonic suppression method is actually applied, the problem of fault current suppression errors exists, so that the accuracy of the power distribution network switch protection action is low; the transformer inlet compensation method can interfere with the stability of a power supply system and reduce the power supply reliability.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein.
The embodiment of the invention provides a method and a device for inhibiting switching-on inrush current of a power distribution network switch, and electronic equipment, which can perform the protection action of the power distribution network switch with higher accuracy, and inhibit the switching-on inrush current of the power distribution network switch, thereby improving the reliability of power supply of the power distribution network.
In a first aspect, an embodiment of the present invention provides a method for suppressing a switching-on inrush current of a power distribution network switch, which is applied to a device for suppressing a switching-on inrush current of a power distribution network switch, where the device includes: the intelligent feeder terminal is electrically connected with the switch controller;
the method comprises the following steps:
the intelligent feeder terminal performs real-time sampling processing on the voltage and the current of the power distribution network line to obtain an instantaneous sampling data value; comparing the sampled data values with a preset overcurrent protection threshold one by one, triggering an inertia logic signal under the condition that the sampled data values are larger than the positive value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to be 1, and performing falling edge hysteresis judgment to obtain a switch control signal; and sending the switch control signal to the switch controller;
And the switch controller responds to the switch control signal to perform protection judgment processing on the power distribution network switch every other preset processing period, and controls the power distribution network switch to perform corresponding protection action to cut off faults.
According to some embodiments of the present invention, the triggering the inertia logic signal, setting the logic value of the inertia logic signal to 1, performing falling edge hysteresis judgment processing to obtain a switch control signal, includes:
after triggering the inertia logic signal, performing signal output timing processing to obtain output time delay of the inertia logic signal;
detecting the sampling data value smaller than the negative value of the overcurrent protection threshold in preset detection time, and continuously outputting the inertia logic signal with the logic value of 1;
and outputting the overcurrent fault signal under the condition that the output time delay of the inertia logic signal exceeds a setting value.
According to some embodiments of the present invention, the triggering the inertia logic signal, setting the logic value of the inertia logic signal to 1, performing falling edge hysteresis judgment processing to obtain a switch control signal, includes:
after triggering the inertia logic signal, performing signal output timing processing to obtain output time delay of the inertia logic signal;
In a preset detection time, the sampling data value smaller than the negative value of the overcurrent protection threshold is not detected, and the logic value of the inertia logic signal is set to 0;
and outputting the inrush current suppression signal under the condition that the output delay of the inertia logic signal exceeds a setting value.
According to some embodiments of the present invention, the switch controller responds to the switch control signal to perform protection judgment processing on the power distribution network switch, and controls the power distribution network switch to perform corresponding protection actions, and the fault is cut off, including:
the switch controller responds to the overcurrent fault signal to perform first timing processing to obtain first time delay;
and under the condition that the first time delay is equal to the overcurrent time delay fixed value, the switch controller controls the power distribution network switch to perform tripping action, so that overcurrent faults are removed.
According to some embodiments of the present invention, the switch controller responds to the switch control signal to perform protection judgment processing on the power distribution network switch, and controls the power distribution network switch to perform corresponding protection actions, and the fault is cut off, including:
the switch controller responds to the inrush current suppression signal to perform second timing processing to obtain second time delay;
And the switch controller compares the second time delay with a preset surge suppressing time delay fixed value, and controls the power distribution network switch to be kept closed under the condition that the second time delay is smaller than the surge suppressing time delay fixed value, so that the overcurrent fault is not cut off.
According to some embodiments of the invention, the switch controller further includes, after comparing the second delay with a preset surge suppression delay value:
comparing the detected sampling data value with a preset overcurrent set value under the condition that the second time delay is not smaller than the surge suppressing time delay fixed value;
and if the sampling data value is larger than the overcurrent set value, controlling the power distribution network switch to trip and cutting off the overcurrent fault under the condition that the second time delay is equal to the overcurrent delay set value.
According to some embodiments of the invention, after comparing the sampled data values with a preset overcurrent protection threshold one by one, the method further comprises:
judging that the power distribution network line normally operates under the condition that the sampling data value is smaller than or equal to the overcurrent protection threshold value;
and under the condition that the power distribution network line normally operates, the inertia logic signal is not triggered.
In a second aspect, an embodiment of the present invention provides a device for suppressing a switching-on inrush current of a switch of a power distribution network, including: the intelligent feeder terminal is electrically connected with the switch controller;
the intelligent feeder terminal is used for carrying out real-time sampling processing on the voltage and the current of the power distribution network line to obtain an instantaneous sampling data value; comparing the sampled data values with a preset overcurrent protection threshold one by one, triggering an inertia logic signal under the condition that the sampled data values are larger than the positive value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to be 1, and performing falling edge hysteresis judgment to obtain a switch control signal; and sending the switch control signal to the switch controller;
and the switch controller is used for responding to the switch control signal to perform protection judgment processing on the power distribution network switch every other preset processing period, controlling the power distribution network switch to perform corresponding protection action and cutting off faults.
In a third aspect, an embodiment of the present invention provides an electronic device, including: the method for suppressing switching on and off inrush current of a power distribution network according to any one of the embodiments of the first aspect is implemented when the processor executes the computer program.
In a fourth aspect, an embodiment of the present invention provides a computer readable storage medium, storing computer executable instructions, where the computer executable instructions are configured to implement a method for suppressing a switching-on inrush current of a power distribution network switch according to any one of the embodiments of the first aspect when executed by a computer.
The embodiment of the invention comprises the following steps: in the running process of the power distribution network, the intelligent feeder terminal samples and processes the voltage and current of the power distribution network line in real time to obtain an instantaneous sampling data value; comparing the sampled data values with a preset overcurrent protection threshold one by one, triggering an inertia logic signal under the condition that the sampled data values are larger than the positive value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to be 1, and performing falling edge hysteresis judgment to obtain a switch control signal; and sending a switch control signal to a switch controller; and the switch controller responds to the switch control signal every other preset processing period to perform protection judgment processing on the power distribution network switch, and controls the power distribution network switch to perform corresponding protection action to cut off faults. The switch controller responds to the switch control signal output in the falling edge hysteresis judgment processing to perform the switch protection judgment processing of the power distribution network, so that overcurrent protection misoperation during switching-on inrush current of the power distribution network can be reduced, correct protection operation is performed, switching-on inrush current of the power distribution network switch is restrained, and accordingly the reliability of power supply of the power distribution network is improved. That is, the embodiment of the invention can perform the protection action of the power distribution network switch with higher accuracy, and inhibit the closing inrush current of the power distribution network switch, thereby improving the reliability of power supply of the power distribution network.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
Fig. 1 is a schematic structural diagram of a device for suppressing switching-on inrush current of a power distribution network according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for suppressing a switching inrush current of a power distribution network according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a falling edge hysteresis determination process according to an embodiment of the present invention;
FIG. 4 is a schematic workflow diagram of an intelligent feeder terminal provided in one embodiment of the present invention;
FIG. 5 is a graph of the results of simulation verification of single-phase current for a transient event, a two-phase-to-phase short circuit;
FIG. 6 is a graph of the results of simulation verification of single-phase current for a transient event, such as a three-phase-to-phase short circuit;
fig. 7 is a schematic hardware structure of an electronic device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
It should be noted that although a logical order is illustrated in the flowchart in the description of the present invention, in some cases, the steps illustrated or described may be performed in an order different from that in the flowchart. In the description of the present invention, a plurality means one or more, and a plurality means two or more. The description of "first" and "second" is used for the purpose of distinguishing between technical features only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
The switching-on surge current in the medium-voltage distribution network line can bring a plurality of hazards and risks. For example, there are: instantaneous overcurrent, fault tripping and frequent protection actions. The instantaneous overcurrent means that the inrush current can cause the instantaneous overcurrent, and causes electric power impact on equipment and circuits, so that the circuits are subjected to insulation damage, physical components are easy to generate faults such as thermal runaway and melting, and the like, and the damage to hardware and the like of electronic equipment is possible. The fault tripping refers to that when the inrush current exceeds the load capacity of equipment and a protection system, the protection device erroneously recognizes overload or fault to perform power-off and tripping operation, and finally normal operation of the equipment and the line is affected. Frequent protective actions refer to high frequencies of inrush currents and transient harmonic high currents that can cause relays and protective overload. Frequent protective actions not only reduce the reliability of the system, but also increase the maintenance and operating costs of the system.
In the related technology, with the continuous development of the power system, the problem of switch closing inrush current in the power system of the power distribution network can be effectively solved by using the inrush current inhibition technology, and the stability and reliability of the power distribution network system are improved. The current method for suppressing the switch-on inrush current in the power distribution network mainly comprises direct current bias, transformer inlet compensation, magnetic core saturation, even harmonic suppression and the like. However, the dc bias method suppresses harmonics by introducing a dc bias at the ground point, but in some cases it may cause unnecessary electrolytic corrosion or generate corresponding reactive power. The transformer inlet compensation method may interfere with the stability of the power supply system and such devices are often bulky. The magnetic core saturation method changes the saturation state of the magnetic core so as to reduce the output of the magnetic core, thereby reducing the size of harmonic waves; however, sometimes nonlinear distortion and stress increase, and the damage to the magnetic core is serious. The even harmonic suppression mainly compares the effective value percentage of the second harmonic with the fundamental wave, and when the effective value percentage exceeds 20%, the effective value percentage is judged to be the inrush current, and the suppression of the fault current which is larger than the protection fixed value is not performed. In the method, the fault current has rich even harmonic waves, and the fault current is still inhibited from being in error in actual operation.
Based on the method, the device, the electronic equipment and the computer readable storage medium for suppressing the switching-on inrush current of the power distribution network switch are provided; in the running process of the power distribution network, the intelligent feeder terminal samples and processes the voltage and current of the power distribution network line in real time to obtain an instantaneous sampling data value; comparing the sampled data values with a preset overcurrent protection threshold one by one, triggering an inertia logic signal under the condition that the sampled data values are larger than the positive value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to be 1, and performing falling edge hysteresis judgment to obtain a switch control signal; and sending a switch control signal to a switch controller; and the switch controller responds to the switch control signal every other preset processing period to perform protection judgment processing on the power distribution network switch, and controls the power distribution network switch to perform corresponding protection action to cut off faults. The switch controller responds to the switch control signal output in the falling edge hysteresis judgment processing to perform the switch protection judgment processing of the power distribution network, so that overcurrent protection misoperation during switching-on inrush current of the power distribution network can be reduced, correct protection operation is performed, switching-on inrush current of the power distribution network switch is restrained, and accordingly the reliability of power supply of the power distribution network is improved. That is, the embodiment of the invention can perform the protection action of the power distribution network switch with higher accuracy, and inhibit the closing inrush current of the power distribution network switch, thereby improving the reliability of power supply of the power distribution network.
Embodiments of the present invention will be further described below with reference to the accompanying drawings.
In one aspect, as shown in fig. 1, an embodiment of the present invention provides a device 100 for suppressing a switching-on/switching-off inrush current of a power distribution network, including: the intelligent feeder terminal 110, the switch controller 120 electrically connected with the intelligent feeder terminal 110, and the distribution network switch 130 electrically connected with the switch controller 120.
The intelligent feeder terminal 110 is configured to sample the voltage and the current of the power distribution network line in real time to obtain an instantaneous sampled data value; comparing the sampled data values with a preset overcurrent protection threshold one by one, triggering an inertia logic signal under the condition that the sampled data values are larger than the positive value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to be 1, and performing falling edge hysteresis judgment to obtain a switch control signal; and sends a switch control signal to the switch controller.
The switch controller 120 is configured to perform a protection judgment process on the power distribution network switch in response to the switch control signal, and control the power distribution network switch to perform a corresponding protection action, so as to cut off the fault.
It is appreciated that the switch controller 120 is capable of controlling the protective actions of the distribution network switch 130. In the running process of the power distribution network, the intelligent feeder terminal 110 and the switch controller 120 work cooperatively, the switch controller 120 responds to the switch control signal output in the falling edge hysteresis judgment processing performed by the intelligent feeder terminal 110 to perform power distribution network switch protection judgment processing, overcurrent protection misoperation during power distribution network switching-on inrush current can be reduced, correct protection action is performed, the switching-on inrush current of the power distribution network switch is restrained, and accordingly the power distribution reliability of the power distribution network is improved. Therefore, the device 100 for inhibiting the switching-on inrush current of the power distribution network switch provided by the embodiment of the invention can perform the protection action of the power distribution network switch with higher accuracy, and inhibit the switching-on inrush current of the power distribution network switch, thereby improving the reliability of power supply of the power distribution network.
It will be appreciated by persons skilled in the art that the arrangement of parts shown in the drawings is not limiting of the embodiments of the invention, and may include more or fewer parts than shown, or may be combined with certain parts, or a different arrangement of parts.
The system embodiments described above are merely illustrative, in that the units illustrated as separate components may or may not be physically separate, i.e., may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
It will be understood by those skilled in the art that the device structure and the application scenario described in the embodiment of the present invention are for more clearly describing the technical solution of the embodiment of the present invention, and are not limited to the technical solution provided in the embodiment of the present invention, and those skilled in the art can know that the technical solution provided in the embodiment of the present invention is equally applicable to similar technical problems with the evolution of the device structure and the occurrence of new application scenario.
Based on the device structure, various embodiments of the method for suppressing the switching-on and switching-off inrush current of the power distribution network are provided below.
In a first aspect, as shown in fig. 2, the method for suppressing the inrush current of a switch of a power distribution network can be applied to the apparatus shown in fig. 1, and the method may include, but is not limited to, steps S110 to S120.
Step S110: the intelligent feeder terminal samples the voltage and the current of the power distribution network line in real time to obtain an instantaneous sampled data value; comparing the sampled data values with a preset overcurrent protection threshold one by one, triggering an inertia logic signal under the condition that the sampled data values are larger than the positive value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to be 1, and performing falling edge hysteresis judgment to obtain a switch control signal; and sends a switch control signal to the switch controller.
In the step, the intelligent feeder terminal performs accurate identification and judgment according to the sampled data value to obtain a relatively accurate switch control signal, so that the switch controller can respond to the switch control signal to reduce overcurrent protection misoperation when the power distribution network is in switching-on inrush current, accurately perform correct protection action and effectively inhibit the switching-on inrush current of the power distribution network switch.
According to some embodiments of the invention, under the condition that the sampled data value is less than or equal to the overcurrent protection threshold, judging that the power distribution network line is in normal operation; under the condition that the power distribution network line normally operates, the inertia logic signal is not triggered. By setting the overcurrent protection threshold, the sampled data value is compared with the overcurrent protection threshold to accurately judge the running condition of the detected power distribution network line, so that erroneous judgment is reduced.
Step S120: and the switch controller responds to the switch control signal every other preset processing period to perform protection judgment processing on the power distribution network switch, and controls the power distribution network switch to perform corresponding protection action to cut off faults.
In the step, the switch controller can respond to a relatively accurate switch control signal to perform corresponding protection actions, and effectively inhibit the switching-on inrush current of the power distribution network switch, so that the stability and reliability of power supply of the power distribution network are improved.
In one embodiment, the predetermined processing period refers to a cycle time, specifically 20ms. Through setting up the processing cycle of predetermineeing for the switch controller can carry out distribution network switch protection judgement processing in order, ensures that the switch controller can reliably operate. It will be appreciated that the preset processing period may be set according to actual requirements, and the present invention is not limited thereto.
Through steps S110 to S120, in the running process of the power distribution network, the intelligent feeder terminal samples the voltage and the current of the power distribution network line in real time to obtain an instantaneous sampling data value; comparing the sampled data values with a preset overcurrent protection threshold one by one, triggering an inertia logic signal under the condition that the sampled data values are larger than the positive value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to be 1, and performing falling edge hysteresis judgment to obtain a switch control signal; and sending a switch control signal to a switch controller; and the switch controller responds to the switch control signal every other preset processing period to perform protection judgment processing on the power distribution network switch, and controls the power distribution network switch to perform corresponding protection action to cut off faults. The switch controller responds to the switch control signal output in the falling edge hysteresis judgment processing to perform the switch protection judgment processing of the power distribution network, so that overcurrent protection misoperation during switching-on inrush current of the power distribution network can be reduced, correct protection operation is performed, switching-on inrush current of the power distribution network switch is restrained, and accordingly the reliability of power supply of the power distribution network is improved. That is, the embodiment of the invention can perform the protection action of the power distribution network switch with higher accuracy, and inhibit the closing inrush current of the power distribution network switch, thereby improving the reliability of power supply of the power distribution network.
According to some embodiments of the invention, step S110 includes: after the inertia logic signal is triggered, performing signal output timing processing to obtain the output time delay of the inertia logic signal; detecting a sampling data value smaller than the negative value of the overcurrent protection threshold in preset detection time, and continuously outputting an inertia logic signal with a logic value of 1; and outputting an overcurrent fault signal under the condition that the output time delay of the inertia logic signal exceeds a setting value.
In the process of falling edge hysteresis judgment processing, the intelligent feeder terminal outputs an overcurrent fault signal under the condition that overload, faults and other overcurrent faults exist in the power distribution network; so that the switch controller responds to the overcurrent fault signal to perform corresponding correct protection action; thereby improving the reliability and stability of power supply of the power distribution network.
According to some embodiments of the invention, step S110 includes: after the inertia logic signal is triggered, performing signal output timing processing to obtain the output time delay of the inertia logic signal; in a preset detection time, a sampling data value smaller than the negative value of the overcurrent protection threshold is not detected, and the logic value of the inertia logic signal is set to be 0; and outputting the inrush current suppression signal when the output delay of the inertia logic signal exceeds a set value.
In the process of falling edge hysteresis judgment processing, the intelligent feeder terminal outputs an inrush current suppression signal under the condition of judging that inrush current exists in a power distribution network, overload or fault and other overcurrent faults exist; so that the switch controller responds to the inrush current suppression signal to perform corresponding correct protection actions; thereby improving the reliability and stability of power supply of the power distribution network.
Referring to fig. 3, the "trigger inertia logic signal, the logic value of the inertia logic signal is set to 1, and the falling edge hysteresis determination process is performed to obtain the switch control signal" in step S110 is further described.
And triggering an inertial logic signal by the feeder line of the intelligent terminal, setting the logic value of the inertial logic signal to be 1, and then performing signal output timing processing to obtain the output time delay of the inertial logic signal. Judging whether the output time delay is in a preset detection range or not, if not, not detecting and judging the sampling current value; if yes, continuing to judge whether the sampled data value is smaller than the negative value of the overcurrent protection threshold. On the one hand, if the sampled data value is smaller than the negative value of the overcurrent protection threshold, continuously outputting an inertia logic signal with a logic value of 1, and then judging whether the output delay exceeds a setting value; if yes, outputting an overcurrent fault signal; if not, the overcurrent fault signal is not output. On the other hand, if the sampled data value is not smaller than the negative value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to 0 and continuously outputting, and then judging whether the output delay exceeds a setting value; if yes, outputting a surge suppressing signal; if not, the inrush current suppression signal is not output.
In the embodiment of the invention, the switch control signal output by the intelligent feeder terminal is an overcurrent fault signal or an inrush current suppression signal. Specifically, under the condition that the power distribution network is judged to have overload or fault and other overcurrent faults, an overcurrent fault signal is output; or outputting an inrush current suppression signal when it is determined that an inrush current exists in the power distribution network, and an overcurrent fault such as overload or fault exists. Therefore, when the inrush current exceeds the load capacity of equipment and a protection system, the embodiment of the invention can correctly identify that the inrush current phenomenon exists in the power distribution network, and can not incorrectly identify as overload or fault to perform power-off and tripping operations; thereby ensuring the normal operation of equipment and distribution network lines.
As an example, in connection with fig. 4, the intelligent feeder terminal enters a loop to sample line voltage and current in real time to obtain a sampled data value; then, it is determined whether the instantaneous sampled data value is greater than an over-current protection threshold. On the one hand, if the instantaneous sampling data value is not greater than the overcurrent protection threshold, starting a timer 1 for timing; then, judging whether the timer 1 is full, if not, no operation is performed; if yes, the inertia logic signal is clear; on the other hand, if the instantaneous sampled data value is greater than the over-current protection threshold, the inertia logic signal is triggered and the timer 1 is cleared. Then judging whether the inertia logic signal is triggered or not; if not, resetting the timer 2; if yes, a timer 2 is started to count. Then judging whether the timer is full, if not, not triggering a hysteresis judgment flow; if yes, triggering an overcurrent judging flow, then outputting a switch control signal, and ending the cycle.
It should be noted that, the principle of the embodiment of the present invention for detecting the inrush current to perform the suppression judgment is as follows: instantaneous logic judgment refers to: triggering an inertia logic signal when the sampling data value is larger than the overcurrent protection threshold value, and setting the logic value of the inertia logic signal to be 1; otherwise, when the sampled data value is less than the over-current protection threshold, the logic value of the inertia logic signal is set to 0. Starting to perform transient logic judgment, and timing and sampling a delay t1 with a data value larger than an overcurrent protection threshold under the condition that an inertia logic signal is triggered to be 1; and then repeating the instantaneous logic judgment again under the condition that the next sampled data value is larger than the overcurrent protection threshold value, and timing the time delay t2 that the sampled data value is larger than the overcurrent protection threshold value. The adjacent two instantaneous inertia logic judges that the recorded delay t1 and the delay t2 must be more than at least 3 sampling point times, otherwise, the jitter interference of sampling is considered. If the time interval between the time when one timing is finished and the time when the next adjacent timing is started is smaller than the jitter elimination time, the inertia logic judges that the output is 1, namely the power distribution network has overcurrent faults; if the time interval between the time when one time is finished and the time when the next time is started is larger than the jitter elimination time, the inertia logic judges that the output is 0, namely the overcurrent fault exists in the power distribution network and the overcurrent is simultaneously present, and the overcurrent locking operation of the overcurrent brake is required to be carried out when the terminal is applied. The debounce time is fixed, and is 1/2 cycle time=10 ms.
In some embodiments, if the trigger condition is that the instantaneous sampled data value is less than the negative of the protection set over-current protection threshold, the same logic-judged rising edge hysteresis judgment processing flow is entered. The rising edge lag determination processing flow is described as follows: and triggering an inertial logic signal by the feeder line of the intelligent terminal, setting the logic value of the inertial logic signal to be 1, and then performing signal output timing processing to obtain the output time delay of the inertial logic signal. Judging whether the output time delay is in a preset detection range or not, if not, not detecting and judging the sampling current value; if yes, continuing to judge whether the sampled data value is larger than the positive value of the overcurrent protection threshold. On the one hand, if the sampled data value is larger than the positive value of the overcurrent protection threshold, continuously outputting an inertia logic signal with a logic value of 1, and then judging whether the output delay exceeds a setting value; if yes, outputting an overcurrent fault signal; if not, the overcurrent fault signal is not output. On the other hand, if the sampled data value is not greater than the positive value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to 0 and continuously outputting, and then judging whether the output delay exceeds the setting value; if yes, outputting a surge suppressing signal; if not, the inrush current suppression signal is not output.
The switch control signal output by the intelligent feeder terminal is an overcurrent fault signal or an inrush current suppression signal, and the switch controller carries out different treatments based on different switch control signals, specifically as follows:
step S120 is further described according to some embodiments of the present invention, and step S120 includes, but is not limited to, the following steps: the switch controller responds to the overcurrent fault signal to perform first timing processing to obtain first time delay; under the condition that the first time delay is equal to the overcurrent time delay fixed value, the switch controller controls the switch of the power distribution network to carry out tripping action, and overcurrent faults are removed.
It will be appreciated that in the event that the first delay is not equal to the over-current delay fixed value, the switch controller will not control the power distribution network switch to perform the trip action.
The switch controller responds to the overcurrent fault signal to perform corresponding protection judgment processing on the power distribution network switch so as to accurately control the power distribution network switch to perform corresponding protection action and cut off faults, thereby being beneficial to improving the reliability and stability of power supply of the power distribution network.
Step S120 is further described according to some embodiments of the present invention, and step S120 includes, but is not limited to, the following steps: the switch controller responds to the inrush current suppression signal and performs second timing processing to obtain second time delay; and the switch controller compares the second time delay with a preset surge suppression time delay fixed value, and controls the switch of the power distribution network to be kept closed under the condition that the second time delay is smaller than the surge suppression time delay fixed value, so that the overcurrent fault is not cut off.
That is, if the inrush suppression signal is detected, when the second time delay of the timer is smaller than the inrush suppression delay timing value, the overcurrent fault removal action is not performed even if the sampled data value is detected to be larger than the overcurrent set value at the same time.
According to some embodiments of the present invention, the switch controller further includes, after comparing the second delay with a preset surge suppression delay value: comparing the detected sampling data value with a preset overcurrent set value under the condition that the second time delay is not smaller than the surge suppression time delay set value; and if the sampling data value is greater than the overcurrent set value, controlling the switch of the power distribution network to trip and cutting off the overcurrent fault under the condition that the second time delay is equal to the overcurrent set value.
The switch controller responds to the inrush current inhibition signal to perform corresponding protection judgment processing on the power distribution network switch so as to accurately control the power distribution network switch to perform corresponding protection action and cut off faults, thereby being beneficial to improving the reliability and stability of power supply of the power distribution network.
It should be noted that, the overcurrent protection logic is mainly aimed at short circuit faults, and should not be interfered by transient overcurrent signals such as magnetizing inrush current. And selecting interphase short circuit and three-phase short circuit as typical short circuit faults, selecting excitation surge current characteristics under two typical conditions that the closing angle is approximately 0 DEG and 90 DEG, and carrying out simulation to obtain different transient current waveforms. The method of the embodiment of the invention is verified by simulation by using different transient current waveforms to obtain the algorithm judgment results of the different transient current waveforms shown in fig. 5 and 6. Thus, the feasibility of the embodiment of the invention is verified, the setting value of the output overcurrent fault signal in the algorithm verification example is set to be 40ms, and theoretically, the required time can be as low as one cycle, namely 20ms.
It can be understood that the algorithm for judging based on the inertia logic signal is integrated in the intelligent feeder terminal, and the relay protection tester can be adopted to replay waveforms of the overcurrent fault and the no-load closing inrush current detected by the intelligent feeder terminal, so as to judge the correctness of the switching closing inrush current suppression function.
The specific method comprises the following steps: and selecting a waveform playback function, and taking three sections of waveforms to respectively represent overcurrent, fault removal and superposition to faults. The overcurrent waveform selects a steady-state section of the inrush waveform, the fault removal waveform selects a no-current section of the inrush waveform, and the no-current section is overlapped with the fault, namely the transient-state-containing waveform section. Partial test records were obtained as shown in tables 1 and 2, where table 1 is the overcurrent and inrush suppression protection test record table and table 2 is the post acceleration protection test record.
TABLE 1
| Group number | Overcurrent waveform file | Parameters (parameters) | Reference results | Test results |
| 1 | 0degS＝7.8MVA | Overcurrent I section 0 seconds, inrush current suppression exit | Action | Action |
| 2 | 0degS＝7.8MVA | Overcurrent section I for 0.5 seconds, and the inrush current is restrained from exiting | Is not operated | Is not operated |
| 3 | 0degS＝7.8MVA | Overcurrent I section 0 seconds, inrush current suppression input | Is not operated | Is not operated |
| 4 | 0degS＝15.6MVA | Overcurrent I section 0 seconds, inrush current suppression exit | Action | Action |
| 5 | 0degS＝15.6MVA | Overcurrent section I for 0.5 seconds, and the inrush current is restrained from exiting | Is not operated | Is not operated |
| 6 | 0degS＝15.6MVA | Overcurrent I section 0 seconds, inrush current suppression input | Is not operated | Is not operated |
| 7 | 90degS＝7.8MVA | Overcurrent I section 0 seconds, inrush current suppression exit | Action | Action |
| 8 | 90degS＝7.8MVA | Overcurrent section I for 0.5 seconds, and the inrush current is restrained from exiting | Is not operated | Is not operated |
TABLE 2
| Group number | Waveform file coincident with fault | Parameters (parameters) | Reference results | Test results |
| 1 | 0degS＝7.8MVA | Post acceleration for 0 seconds, the inrush current inhibits exit | Action | Action |
| 2 | 0degS＝7.8MVA | Post acceleration for 0.5 seconds, the inrush current inhibits exit | Is not operated | Is not operated |
| 3 | 0degS＝7.8MVA | Post acceleration for 0 seconds, inrush current suppression input | Is not operated | Is not operated |
| 4 | 0degS＝15.6MVA | Post acceleration for 0 seconds, the inrush current inhibits exit | Action | Action |
| 5 | 0degS＝15.6MVA | Post acceleration for 0.5 seconds, the inrush current inhibits exit | Is not operated | Is not operated |
| 6 | 0degS＝15.6MVA | Post acceleration for 0 seconds, inrush current suppression input | Is not operated | Is not operated |
| 7 | 90degS＝7.8MVA | Post acceleration for 0 seconds, the inrush current inhibits exit | Action | Action |
| 8 | 90degS＝7.8MVA | Post acceleration for 0.5 seconds, the inrush current inhibits exit | Is not operated | Is not operated |
From the test results, the device for inhibiting the switching-on inrush current of the power distribution network switch can accurately identify the overcurrent fault and the switching-on inrush current and perform the correct protection action by adopting the method for inhibiting the switching-on inrush current of the power distribution network switch. Compared with the traditional second harmonic braking, the method for suppressing the switching-on inrush current of the power distribution network has at least the following beneficial effects.
Firstly, the parameters adopted in the embodiment of the invention are different from the traditional second harmonic braking, and the parameters are simplified. The traditional second harmonic braking method parameters include: the method only comprises two parameters of switching, second harmonic proportion, braking time and the like, and simplifies configuration parameters, thereby being beneficial to user operation.
Secondly, the embodiment of the invention can rapidly distinguish the superimposed steady-state second harmonic signal from the real surge signal, and can rapidly remove the brake when the overcurrent signal containing the steady-state second harmonic signal is applied.
Third, the response speed of the braking signal of the embodiment of the invention is always faster than that of various forms of Fourier transform and integration method, so that special treatment on overcurrent protection delay is not needed under various complex conditions, and the threshold value class protection and inrush current identification functions can be further decoupled at a code level.
The method of the embodiment of the invention makes up the defects of the traditional detection method on one hand, accelerates the speed of closing inrush current inhibition and identification on the other hand, and has better effect.
In a third aspect, referring to fig. 7, an electronic device 700 includes: the processor 710 includes a memory 720, a processor 710, and a computer program stored on the memory 720 and executable on the processor, the processor 710 when executing the computer program implementing a method for power distribution network switch closing inrush current suppression as in the first aspect.
Processor 710 and memory 720 may be connected by a bus or other means.
The processor 710 may be implemented by a general purpose central processing unit, a microprocessor, an application specific integrated circuit, or one or more integrated circuits, etc. for executing related programs to implement the technical solutions provided by the embodiments of the present invention.
Memory 720 is a non-transitory computer-readable storage medium that may be used to store non-transitory software programs as well as non-transitory computer-executable programs. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some implementations, memory 720 may optionally include memory located remotely from the processor to which the remote memory may be connected via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The non-transitory software programs and instructions required to implement the method of power distribution network switch closing inrush current suppression of the above-described embodiments are stored in a memory that, when executed by a processor, performs the method of power distribution network switch closing inrush current suppression of the above-described embodiments, for example, performs the method steps shown in fig. 2, 3, and 4 described above.
The apparatus embodiments or system embodiments described above are merely illustrative, in which elements illustrated as separate components may or may not be physically separate, i.e., may be located in one place, or may be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or controller, for example, by one of the above-described embodiments of the apparatus, to cause the above-described processor to perform the method of power distribution network switch-on inrush current suppression in the above-described embodiments, for example, to perform the method steps shown in fig. 2, 3, and 4 described above.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present invention, and these equivalent modifications and substitutions are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a distribution network switch closing inrush current suppression method which is characterized in that the device applied to distribution network switch closing inrush current suppression includes: the intelligent feeder terminal is electrically connected with the switch controller;
the method comprises the following steps:
the intelligent feeder terminal performs real-time sampling processing on the voltage and the current of the power distribution network line to obtain an instantaneous sampling data value; comparing the sampled data values with a preset overcurrent protection threshold one by one, triggering an inertia logic signal under the condition that the sampled data values are larger than the positive value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to be 1, and performing falling edge hysteresis judgment to obtain a switch control signal; and sending the switch control signal to the switch controller;
And the switch controller responds to the switch control signal to perform protection judgment processing on the power distribution network switch every other preset processing period, and controls the power distribution network switch to perform corresponding protection action to cut off faults.
2. The method of claim 1, wherein triggering the inertia logic signal, setting a logic value of the inertia logic signal to 1, performing a falling edge hysteresis determination process, and obtaining a switch control signal, includes:
after triggering the inertia logic signal, performing signal output timing processing to obtain output time delay of the inertia logic signal;
detecting the sampling data value smaller than the negative value of the overcurrent protection threshold in preset detection time, and continuously outputting the inertia logic signal with the logic value of 1;
and outputting an overcurrent fault signal under the condition that the output time delay of the inertia logic signal exceeds a setting value.
3. The method of claim 1, wherein triggering the inertia logic signal, setting a logic value of the inertia logic signal to 1, performing a falling edge hysteresis determination process, and obtaining a switch control signal, includes:
after triggering the inertia logic signal, performing signal output timing processing to obtain output time delay of the inertia logic signal;
In a preset detection time, the sampling data value smaller than the negative value of the overcurrent protection threshold is not detected, and the logic value of the inertia logic signal is set to 0;
and outputting a surge suppressing signal under the condition that the output time delay of the inertia logic signal exceeds a setting value.
4. The method according to claim 2, wherein the switch controller, in response to the switch control signal, performs a protection judgment process for the power distribution network switch, and controls the power distribution network switch to perform a corresponding protection action, and the fault is cut off, including:
the switch controller responds to the overcurrent fault signal to perform first timing processing to obtain first time delay;
and under the condition that the first time delay is equal to the overcurrent time delay fixed value, the switch controller controls the power distribution network switch to perform tripping action, so that overcurrent faults are removed.
5. A method according to claim 3, wherein the switch controller, in response to the switch control signal, performs a protection judgment process for the power distribution network switch, and controls the power distribution network switch to perform a corresponding protection action, and the fault is cut off, including:
the switch controller responds to the inrush current suppression signal to perform second timing processing to obtain second time delay;
And the switch controller compares the second time delay with a preset surge suppressing time delay fixed value, and controls the power distribution network switch to be kept closed under the condition that the second time delay is smaller than the surge suppressing time delay fixed value, so that the overcurrent fault is not cut off.
6. The method of claim 5, wherein the switching controller comparing the second delay with a preset surge suppression delay value further comprises:
comparing the detected sampling data value with a preset overcurrent set value under the condition that the second time delay is not smaller than the surge suppressing time delay fixed value;
and if the sampling data value is larger than the overcurrent set value, controlling the power distribution network switch to trip and cutting off the overcurrent fault under the condition that the second time delay is equal to the overcurrent delay set value.
7. The method of claim 1, wherein after comparing the sampled data values individually to a preset overcurrent protection threshold, further comprising:
judging that the power distribution network line normally operates under the condition that the sampling data value is smaller than or equal to the overcurrent protection threshold value;
and under the condition that the power distribution network line normally operates, the inertia logic signal is not triggered.
8. The utility model provides a device that distribution network switch combined floodgate gush current restrained which characterized in that includes: the intelligent feeder terminal is electrically connected with the switch controller;
the intelligent feeder terminal is used for carrying out real-time sampling processing on the voltage and the current of the power distribution network line to obtain an instantaneous sampling data value; comparing the sampled data values with a preset overcurrent protection threshold one by one, triggering an inertia logic signal under the condition that the sampled data values are larger than the positive value of the overcurrent protection threshold, setting the logic value of the inertia logic signal to be 1, and performing falling edge hysteresis judgment to obtain a switch control signal; and sending the switch control signal to the switch controller;
and the switch controller is used for responding to the switch control signal to perform protection judgment processing on the power distribution network switch every other preset processing period, controlling the power distribution network switch to perform corresponding protection action and cutting off faults.
9. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of switching on/off inrush current suppression of a power distribution network according to any of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium storing computer executable instructions for implementing a method of distribution network switch closing inrush current suppression according to any of claims 1 to 7 when executed by a computer.
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