CN114188928A - Disconnection resonance overvoltage suppression method based on intelligent switch - Google Patents
Disconnection resonance overvoltage suppression method based on intelligent switch Download PDFInfo
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- CN114188928A CN114188928A CN202111521350.9A CN202111521350A CN114188928A CN 114188928 A CN114188928 A CN 114188928A CN 202111521350 A CN202111521350 A CN 202111521350A CN 114188928 A CN114188928 A CN 114188928A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a broken line resonance overvoltage suppression method based on an intelligent switch, which comprises the following steps: the arc suppression coil control system monitors neutral point voltage, when the neutral point voltage is larger than or equal to starting voltage, the arc suppression coil control system communicates with each intelligent switch on the feeder line, and each intelligent switch reports line voltage data; analyzing line voltage data characteristics reported by each intelligent switch, and judging whether the line voltage data characteristics meet line break characteristics or not; when the line breaking characteristic is confirmed to be met, the arc suppression coil control system controls the damping resistor to normally work, otherwise, the damping resistor is in short circuit; and the arc suppression coil control system continuously monitors the neutral point voltage, and restores the damping resistor to be in a working state when the neutral point voltage is less than the starting voltage. According to the invention, through the three line voltage amplitude values and the phase data reported by each intelligent switch, when the line break fault characteristic occurs, automatic verification and confirmation can be rapidly completed, and the detection of the line break fault and the switching on and off of the damping resistor are realized. And instruct the remote control intelligent switch to realize fault isolation and prevent personal injury accidents.
Description
Technical Field
The invention relates to the technical field of disconnection resonance overvoltage control, in particular to a disconnection resonance overvoltage suppression method based on an intelligent switch.
Background
In the arc suppression coil control system, in order to prevent the generation of series resonance overvoltage, a method of increasing damping resistance is adopted in an arc suppression coil grounding loop to suppress the generation of wiping overvoltage so as to ensure that the neutral point displacement voltage does not exceed 15% line voltage when the system is in normal operation.
The method for increasing the damping resistance is in the form of series operation of the arc suppression coil loop or parallel operation of the secondary side of the arc suppression coil. When a single-phase earth fault occurs in the system, the neutral point voltage rises, and the neutral point current increases. When the resistance value is larger than the set value, the damping resistor is quickly short-circuited to avoid burning the damping resistor; when the system returns to normal, the short-circuit point of the damping resistor is disconnected, so that the damping resistor is normally connected in series in the arc suppression coil loop, otherwise, the system may have resonance overvoltage due to loss of the damping resistor.
In an electric power system, the broken line resonance overvoltage generated when the system is in non-full-phase operation due to the breakage of a wire, the non-full-phase action or serious different-phase operation of a breaker, the fusing of one phase or two phases of a high-voltage fuse and the like belongs to the broken line ungrounded fault. The disconnection ungrounded fault in an actual line accounts for more, such as the breakage of a drainage wire, the looseness of a switch nose and the like, the existing various low-current line selection devices or wave recording type fault indicators cannot trigger disconnection fault alarm, but the neutral point voltage can be increased when the line is disconnected, the detection of an arc suppression coil system can be mistaken for the occurrence of a single-phase grounding fault, and an arc suppression coil control system can short-circuit a damping resistor, so that disconnection resonance overvoltage can be caused. Because no ground fault actually occurs, the system judgment is wrong, the disconnection resonance overvoltage is caused, and the system is damaged.
Disclosure of Invention
The invention aims to provide a disconnection resonance overvoltage suppression method based on an intelligent switch, which can solve the problem that the disconnection resonance overvoltage is harmful to a system due to misjudgment of an arc suppression coil in the prior art.
The purpose of the invention is realized by the following technical scheme:
a broken line resonance overvoltage suppression method based on an intelligent switch comprises the following steps:
s1, monitoring the neutral point voltage by the arc suppression coil control system, and starting a disconnection detection process when the neutral point voltage is larger than or equal to the starting voltage;
s2, the arc suppression coil control system communicates with each intelligent switch on the feeder line, and each intelligent switch reports line voltage data;
step S3, the arc suppression coil control system analyzes the line voltage data characteristics reported by each intelligent switch, judges whether the line break characteristics are met, and automatically completes the confirmation of the line break fault;
step S4, when the disconnection characteristic is confirmed to be met, the arc suppression coil control system controls the damping resistor to normally work, otherwise, the damping resistor is disconnected;
and step S5, the arc suppression coil control system continuously monitors the neutral point voltage, and when the neutral point voltage is smaller than the starting voltage, the damping resistor is restored to be in a working state. Steps S1 to S5 are repeated.
Furthermore, the value range of the starting voltage is between 20% and 30% of the value of the normal line voltage.
Furthermore, the line voltage data reported by the intelligent switch are three-phase line voltage and phase data at the same moment.
Further, the method for judging whether the disconnection characteristic is satisfied is as follows:
according to the line voltage data reported by all the intelligent switches, two adjacent intelligent switches with different line voltages are calculated and found, a line break point is between the two adjacent intelligent switches with different line voltages, and the line voltage relation between the front line voltage and the rear line voltage of the line break point needs to meet the following requirements:
the amplitudes of the three line voltages of all the intelligent switches before the disconnection point are the same, and the phase difference is 120 degrees;
in the line voltage data reported by the intelligent switch after the line break point, the line voltages of the fault phase relative to other two non-fault phases are equal, the amplitude of the line voltage of the fault phase relative to the non-fault phases is equal to 1/2 +/-10% of the amplitude of the line voltage between the two non-fault phases, and the phase difference between the phase of the line voltage of the fault phase relative to the two non-fault phases and the phase of the line voltage between the two non-fault phases is 180 +/-10%.
Further, the step S4 includes:
a microcomputer controller of the arc suppression coil control system receives line voltage data, neutral point voltage and current parameters of each intelligent switch, and current signals of a protection unit and an internal overvoltage processing module;
the microcomputer controller judges whether the neutral point voltage of the power distribution system is abnormal or not by analyzing the line voltage data parameters and the neutral point voltage parameters, and judges whether the fault type is grounding or line breaking according to the abnormal characteristic of the neutral point voltage;
the microcomputer controller further judges the nature of the fault by analyzing the current signal of the internal overvoltage processing module and combining the line voltage change of each intelligent switch, and feeds back the effect of fault processing.
Further, the microcomputer controller, by analyzing the current signal of the internal overvoltage processing module, further judging the nature of the fault by combining the line voltage change of each intelligent switch, comprises:
judging whether internal overvoltage occurs according to the current signal of the internal overvoltage processing module, and judging and feeding back a processing effect according to the fault type;
judging according to the fault type to determine whether the single-phase earth fault exists, if so, sending a control instruction to a controlled fast switch in a protection unit, executing a closing action, and short-circuiting the damping resistor;
and judging according to the fault type to determine whether the fault belongs to a disconnection fault, if so, not sending a control instruction to a controlled fast switch in the protection unit, and not executing a closing action.
The invention discloses a method for suppressing a disconnection resonance overvoltage based on an intelligent switch, which is characterized in that the input and the short circuit of a damping resistor are controlled, the disconnection resonance overvoltage is suppressed, three line voltage and phase data periodically reported by each intelligent switch of a feeder line are monitored in real time to an arc suppression coil system, once obvious disconnection fault characteristics occur, automatic verification and confirmation are carried out, and finally, the judgment of disconnection faults is realized, namely, the problem that the damping resistor is controlled by the arc suppression coil system, and the disconnection resonance overvoltage is suppressed. The problem of disconnection resonance overvoltage that disconnection ungrounded fault caused in current distribution network arc suppression coil grounding system is solved.
1. The technical scheme of the invention is simple and clear, and the arc suppression coil system and intelligent switches of the circuit are utilized to communicate with each other, compare the fault signal characteristics, distinguish single-phase earth faults and disconnection faults, control the input and short circuit of a damping resistor, and suppress disconnection resonance overvoltage.
2. The intelligent switches of the circuit are the existing circuit switches, so that the investment of equipment is reduced.
3. The intelligent switches of the circuit are distributed, so that wide-area comparison is facilitated, and detection of disconnection faults is facilitated.
4. According to the invention, once obvious line break fault characteristics occur through three line voltage amplitude values and phase data reported by each intelligent switch of the line, the system can quickly complete automatic verification and confirmation, and detection of line break faults and switching on and off of damping resistors are realized. And instruct the remote control intelligent switch to realize fault isolation and prevent personal injury accidents.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a circuit architecture of a system method for implementing the intelligent switch-based line break resonance overvoltage suppression method of the present invention;
FIG. 2 is one of the waveforms of the actual line voltage monitored at the intelligent switch terminal upstream of the trip point and at the intelligent switch terminal downstream of the trip point;
FIG. 3 is a graph of actual neutral voltage waveforms monitored by the arc suppression coil control system;
FIG. 4 is a second graph of the actual line voltage waveform calculated at the intelligent switch terminal upstream of the trip point and at the intelligent switch terminal downstream of the trip point;
FIG. 5 is a flow chart of a system and method for line break resonance overvoltage suppression based on intelligent switches according to the present invention;
FIG. 6 is a system framework diagram of the application of the method of the present invention;
fig. 7 is a logic control schematic diagram of the crowbar coil control system of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The invention discloses a broken line resonance overvoltage suppression method based on an intelligent switch, which comprises the following steps:
and step S1, the arc suppression coil control system monitors the neutral point voltage, and when the neutral point voltage is larger than or equal to the starting voltage, the broken line detection process is started.
The starting voltage is set according to actual conditions, and the preferable value range of the starting voltage is between 20% and 30% of the value of the normal line voltage. The arc suppression coil control system monitors the neutral point voltage in real time.
And step S2, the arc suppression coil control system communicates with each intelligent switch on the feeder line, and each intelligent switch terminal reports line voltage data.
Furthermore, the line voltage data reported by all the intelligent switches are three-phase line voltage and phase data at the same moment. All intelligent switches and the arc suppression coil control system realize data transmission by adopting high-speed wireless communication.
And step S3, the arc suppression coil control system analyzes the line voltage data characteristics reported by each intelligent switch, synthesizes the data wide area of each intelligent switch to judge whether the line break characteristics are met, and automatically completes the confirmation of the line break fault.
The method for judging whether the disconnection characteristic is met comprises the following steps: according to the line voltage data reported by all the intelligent switches, two adjacent intelligent switches with different line voltages are calculated and found, a line break point is between the two adjacent intelligent switches with different line voltages, and the line voltage relation between the front line voltage and the rear line voltage of the line break point needs to meet the following requirements:
in the formula (1), the first and second groups,
the voltage between the phase a and the phase B before the disconnection point,
the voltage between the B phase and the C phase before the disconnection point,
the phase difference between the A phase, the B phase and the C phase is 120 degrees in pairs before the disconnection point,voltage amplitude UNAre equal.
According to the voltage characteristics, the amplitudes of the three line voltages of all intelligent switches before the disconnection point are the same, and the phase difference is 120 degrees.
In the formula (2), it is assumed that the disconnection occurs in the B phase,
the voltage of phase B relative to phase A after the disconnection point,
voltage of phase B relative to phase C after disconnection point, UNIs the normal voltage amplitude.
Voltage amplitude of ═
1/2 normal line voltage amplitude, and
phase and
is in the same phase as
Are 180 deg. out of phase. In practice, variations in amplitude and variations in phase difference are allowed to have a certain amplitude, i.e. due to sensor consistency problems on the power line
Voltage amplitude of
Phase and
the phase difference of (1) is 180 +/-10 degrees, and the fault is judged to be a disconnection fault.
In the line voltage data reported by all intelligent switches after the line break point, the line voltages of the fault phase relative to other two non-fault phases are equal, the voltage amplitude of the fault phase relative to the non-fault phases is equal to 1/2 +/-10% of the line voltage amplitude between the two non-fault phases, and the phase difference between the line voltage phase of the fault phase relative to the two non-fault phases and the line voltage phase between the two non-fault phases is 180 +/-10%.
The confirmation of the disconnection fault is not the focus of the present invention and will not be described herein.
Step S4, when the disconnection characteristic is confirmed, the arc suppression coil control system controls the damping resistor to work normally, does not send a control command to the controlled fast switch in the protection unit, does not execute the closing action, and inhibits the generation of disconnection resonance overvoltage; otherwise, a control instruction is sent to a controlled fast switch in the protection unit, closing action is executed, and the damping resistor is in short circuit.
The whole system comprises field intelligent switches and an arc suppression coil control system, and is shown in figure 6. Specifically, intelligent switches D1, D2 and D3 … … Dn are installed from the line substation to the load end in a distributed mode, wherein n is a natural number and is larger than or equal to 1. Each field intelligent switch comprises a power supply unit, a current sensor unit, a data acquisition and processing unit, a communication unit and a switch body, and is in communication connection with the arc suppression coil control system through a wireless communication technology, such as 4G. Each intelligent switch on site carries out analog-digital conversion on the acquired line voltage to form a digital waveform signal, then the digital waveform signal is uploaded to an arc suppression coil control system, the arc suppression coil control system integrates data of each intelligent switch on site to distinguish fault types, whether the fault types are broken lines or ground faults, the arc suppression coil control system realizes protection switching logic of a damping resistor according to the fault types, if the broken line fault is detected, the arc suppression coil control system controls a damping resistor protection unit to keep a switching-in state to suppress the generation of broken line resonance overvoltage, and if the fault is a single-phase ground fault, the damping resistor is short-circuited by the system to avoid burning the damping resistor; when the system returns to normal, the short contact point of the damping resistor is disconnected, so that the damping resistor is normally connected in series in the arc suppression coil loop.
The arc suppression coil control system is used for receiving line voltage data of each intelligent switch, and the microcomputer controller carries out data processing and result judgment generation on the line voltage data, generates a control signal and transmits the control signal to the system protection unit function module to execute the associated action, and the method specifically comprises the following steps:
the microcomputer controller of the arc suppression coil control system receives line voltage data, neutral point voltage and current parameters, current signals of the protection unit and the internal overvoltage processing module of each intelligent switch;
the microcomputer controller judges whether the neutral point voltage of the power distribution system is abnormal or not by analyzing the line voltage parameter and the neutral point voltage parameter, and judges whether the fault type is grounding or disconnection according to the abnormal characteristic of the neutral point voltage;
the microcomputer controller combines the line voltage change of each intelligent switch and further judges the nature of the fault by analyzing the current signal of the internal overvoltage processing module, and feeds back the effect of fault processing, and the microcomputer controller specifically comprises:
judging whether internal overvoltage occurs according to the current signal of the internal overvoltage processing module, and judging and feeding back the processing effect of the functional module according to the fault type;
judging and determining whether the fault belongs to the single-phase earth fault according to the fault, if so, then:
sending a control command to a controlled quick switch in the protection unit, executing closing action, and short-circuiting the damping resistor to avoid burning the damping resistor;
judging and determining whether the fault belongs to a disconnection fault according to the fault, if so, then:
and then a control command is not sent to the controlled fast switch in the protection unit, closing action is not executed, and the generation of the disconnection resonance overvoltage is restrained.
And step S5, the arc suppression coil control system continuously monitors the neutral point voltage, and when the neutral point voltage is smaller than the starting voltage, the damping resistor is restored to be in a working state. Steps S1 to S5 are repeated.
According to the process, neutral point voltage U is collectedO＞UsetNeutral point voltage U, as shown in FIG. 30Greater than starting voltage U of arc suppression coilsetThe arc suppression coil system device is started, and each intelligent switch of the feeder line collects line voltage data and uploads the line voltage data to the arc suppression coil system, and calculates each line voltage amplitude and phase angle, and judges whether the line breaking characteristics are met: if the disconnection characteristic is shown in fig. 4, if the disconnection fault is determined, the arc suppression coil control system controls to keep the damping resistor to be continuously put in, waits for the disconnection fault characteristic to disappear, the system recovers to normal operation, and the system flow is ended.
When a disconnection fault occurs, the neutral point voltage rises, the arc suppression coil control system starts fault detection and communicates with each intelligent switch of the feeder line, each intelligent switch reports data, and the arc suppression coil control system performs real-time analysis according to reported three-phase line voltage amplitude and phase information to determine whether the disconnection characteristic is met.
Referring to fig. 2, the arc suppression coil control system retrieves three-line voltage waveforms of all intelligent switches on a fault line at the current moment, wherein the three-line voltage waveforms have identical time labels.
Based on the confirmation of the disconnection fault of the three-wire voltage waveform of each intelligent switch, as shown in fig. 4, the disconnection is confirmed when the condition is satisfied, the problem of the input of the damping resistor is kept, and the generation of overvoltage is suppressed.
The manner of determining overvoltage suppression according to the present invention is described below with reference to fig. 1:
when a disconnection ungrounded fault occurs between the switch 10 and the switch 11 of the circuit 2, the arc suppression coil control system detects the circuit intelligent switch equipment one by one:
1. partial intelligent switches (switch 2, switch 9, switch 10 and switch 12) of the line 1, the line 3 and the line 2 do not meet the disconnection condition;
2. the line voltages of the switch 10 and the switch 11 or the switch 13 of the fault line 2 are different (including trunk lines and branch lines), and at least one set of the switch 11 and the switch 13 is judged to meet the line breaking condition.
If the current is satisfied, a disconnection fault occurs, and the arc suppression coil control system keeps the input of the damping resistor to suppress the generation of overvoltage.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (6)
1. A broken line resonance overvoltage suppression method based on an intelligent switch is characterized by comprising the following steps:
s1, monitoring the neutral point voltage by the arc suppression coil control system, and starting a disconnection detection process when the neutral point voltage is larger than or equal to the starting voltage;
s2, the arc suppression coil control system communicates with each intelligent switch on the feeder line and receives line voltage data reported by each intelligent switch;
step S3, the arc suppression coil control system analyzes the line voltage data characteristics reported by each intelligent switch, judges whether the line break characteristics are met, and automatically completes the confirmation of the line break fault;
step S4, when the disconnection characteristic is confirmed to be met, the arc suppression coil control system controls the damping resistor to normally work, otherwise, the damping resistor is in short circuit;
and S5, continuously monitoring the neutral point voltage by the arc suppression coil control system, recovering the damping resistor to be in a working state when the neutral point voltage is less than the starting voltage, and repeating the steps S1 to S5.
2. The method for suppressing the disconnection resonance overvoltage based on the intelligent switch as claimed in claim 1, wherein the starting voltage ranges from 20% to 30% of the value of the normal line voltage.
3. The disconnection resonance overvoltage suppression method based on the intelligent switch as claimed in claim 1, wherein the line voltage data reported by the intelligent switch are three-phase line voltage and phase data at the same time.
4. The method for suppressing the disconnection resonance overvoltage based on the intelligent switch as claimed in claim 1, wherein the method for judging whether the disconnection characteristic is satisfied is as follows:
according to the line voltage data reported by all the intelligent switches, two adjacent intelligent switches with different line voltages are found, a line breaking point is between the two adjacent intelligent switches with different line voltages, and the line voltage relation between the front line voltage and the rear line voltage of the line breaking point needs to meet the following requirements:
the amplitudes of the three line voltages of all the intelligent switches before the disconnection point are the same, and the phase difference is 120 degrees;
in the line voltage data reported by all intelligent switches after the line break point, the line voltages of the fault phase relative to other two non-fault phases are equal, the amplitude of the line voltage relative to the non-fault phase is equal to 1/2 +/-10% of the amplitude of the line voltage between the two non-fault phases, and the phase difference between the phase of the line voltage of the fault phase relative to the two non-fault phases and the phase of the line voltage between the two non-fault phases is 180 +/-10%.
5. The method for suppressing the disconnection resonance overvoltage based on the intelligent switch as claimed in claim 1, wherein the step S4 comprises:
a microcomputer controller of the arc suppression coil control system receives line voltage data, neutral point voltage and current parameters of each intelligent switch, and current signals of a protection unit and an internal overvoltage processing module;
the microcomputer controller judges whether the neutral point voltage of the power distribution system is abnormal or not by analyzing the line voltage data parameters and the neutral point voltage parameters, and judges whether the fault type is grounding or line breaking according to the abnormal characteristic of the neutral point voltage;
the microcomputer controller further judges the nature of the fault by analyzing the current signal of the internal overvoltage processing module and combining the line voltage change of each intelligent switch, and feeds back the effect of fault processing.
6. The method for suppressing the line break resonance overvoltage based on the intelligent switch as claimed in claim 5, wherein the said microcomputer controller by analyzing the current signal of the overvoltage processing module inside the microcomputer controller, and combining the line voltage change of each intelligent switch to further judge the nature of the fault includes:
judging whether internal overvoltage occurs according to the current signal of the internal overvoltage processing module, and judging and feeding back a processing effect according to the fault type;
judging according to the fault type to determine whether the single-phase earth fault exists, if so, sending a control instruction to a controlled fast switch in a protection unit, executing a closing action, and short-circuiting the damping resistor;
and judging according to the fault type to determine whether the fault belongs to a disconnection fault, if so, not sending a control instruction to a controlled fast switch in the protection unit, and not executing a closing action.
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| CN111817281A (en) * | 2020-05-25 | 2020-10-23 | 南方电网科学研究院有限责任公司 | Switching control system and method for arc suppression coil parallel low-resistance grounding device |
| CN112202156A (en) * | 2020-10-16 | 2021-01-08 | 南方电网科学研究院有限责任公司 | Arc extinction method and device for power distribution network and power distribution network control equipment |
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| CN114749359A (en) * | 2022-06-14 | 2022-07-15 | 深圳市汇顶科技股份有限公司 | Signal generating circuit and ultrasonic fingerprint identification device |
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