CN105911434B - Power distribution network high resistance earthing fault detection method under Multi-harmonic Sources interference - Google Patents

Power distribution network high resistance earthing fault detection method under Multi-harmonic Sources interference Download PDF

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Publication number
CN105911434B
CN105911434B CN201610514819.9A CN201610514819A CN105911434B CN 105911434 B CN105911434 B CN 105911434B CN 201610514819 A CN201610514819 A CN 201610514819A CN 105911434 B CN105911434 B CN 105911434B
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phase
zero
current
high resistance
circuit
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CN105911434A (en
Inventor
王宾
倪江
王彦良
袁冰
刘宗杰
马良
梁奎
徐斌
魏亚军
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Tsinghua University
Jining Power Supply Co of State Grid Shandong Electric Power Co Ltd
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Tsinghua University
Jining Power Supply Co of State Grid Shandong Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

Power distribution network high resistance earthing fault detection method under Multi-harmonic Sources interference, phase current, the zero sequence current signal of monitoring circuit in real time, calculate the variable quantity of each phase current power frequency amount amplitude and phase, when each phase current power frequency amount amplitude and phase mutate, and monitor zero-sequence current triple-frequency harmonics content be more than threshold value and phase value in actuating range when, be judged as that high resistance earthing fault has occurred in circuit；When each phase current signal mutates, but zero-sequence current triple-frequency harmonics content is less than threshold value or phase value not in actuating range, it is judged as that high resistance earthing fault does not occur for circuit, there are harmonic source interference；The method of the present invention fully excavates the phase changing capacity and amplitude variation measure feature of each phase current of monitored circuit, both the reliable locking of the high resistance earthing fault detection algorithm under Multi-harmonic Sources interference had been can guarantee, the feature of circuit high resistant earth fault has been fully considered again, the sensitivity for promoting detection method to the maximum extent has had both the strong reliability and high sensitivity of detection.

Description

Power distribution network high resistance earthing fault detection method under Multi-harmonic Sources interference
Technical field
The invention belongs to Power System Faults Detection field, more particularly to the power distribution network high resistant under a kind of Multi-harmonic Sources interference Earth-fault detecting method.
Background technology
With the fast development of the regenerative resources such as wind-powered electricity generation, photovoltaic, accounting of the distributed generation resource in distribution is higher and higher, The failure form of power distribution network is no longer only determined by major network power supply and failure vertex type, it is also necessary to consider more distributed generation resource access bands The influence come.
Distributed generation resource is based primarily upon grid-connected inverters, with the feature that fault current fan-out capability is limited, therefore is directed to The fault points such as metallicity, low resistance grounding form, the fault signature that power distribution network is accessed containing more distributed generation resources still mainly depend on In major network power supply characteristic；Conventional failure detection method is substantially effective, is only that sensitivity is declined impacted.But Another of distributed electrical source grid-connected inverter is characterized in that harmonic wave is larger, under multi-inverter collective effect, for distribution Traditional distribution high resistant will occur the case where weak fault current superposition multiple-harmonic current so that in net arc light high resistance earthing fault form The validity of earth-fault detecting method is challenged.
Distribution arc light high resistance earthing fault exists near current zero-crossing point and puts out for low resistance grounding failure Arc, the dynamic process restriked result in and contain higher triple-frequency harmonics in zero-sequence current, therefore traditional distribution high resistance earthing fault Detection is based primarily upon the content of triple-frequency harmonics and phase property in zero-sequence current and carries out.
Regrettably, triple-frequency harmonics is also the main component in inverter generation harmonic content, directly affects existing match The sensitivity and reliability of net high resistive fault detection, easily lead to the error starting of fault detect.
Invention content
In order to overcome the defect of the above-mentioned prior art, matching under being interfered the purpose of the present invention is to provide a kind of Multi-harmonic Sources Power grid high resistance earthing fault detection method further excavates faulted phase current power frequency amplitude and phase property, utilizes phase current Phase and amplitude variable quantity as auxiliary detection criteria, can prevent Multi-harmonic Sources interfere under existing detection method malfunction and It has fully considered the feature of high resistance earthing fault, has promoted the sensitivity of detection method to the maximum extent, having had both the strong of detection can By property and high sensitivity.
Power distribution network high resistance earthing fault detection method under Multi-harmonic Sources interference, specifically includes following steps：
Step (1) acquires the current signal that circuit is measured in distribution substation in real time；Wherein φ is separate, including A Phase, B phases, C phases and zero sequence calculate zero-sequence current i according to the following formula if scene can not measure zero-sequence current0(t)：
i0(t)=iA(t)+iB(t)+iC(t)
Step (2) calculates and detects each phase current operating frequency phase
Then wherein ω=2 π f=100 π, T=1/f=20ms calculate each phase current operating frequency phase in half of cycle Variable quantity
If a certain phase current operating frequency phase variable quantityWithin the scope of 90 °~180 °, and remaining biphase current power frequency phase Position variable quantity is then gone to step (4) within the scope of 0 °~90 °；If three-phase current operating frequency phase variable quantityAt 0 °~90 ° It in range, then goes to step (3)；Other situations are then gone to step (5)；
Step (3) calculates and detects each phase current power frequency amplitude
Then variable quantity of each phase current power frequency amplitude in half of cycle is calculated
If a certain phase current power frequency amplitude change rateIt is described to adjust threshold value value 10% more than adjusting threshold value, and Remaining biphase current power frequency amplitude change rateIt is less than and adjusts threshold value, then go to step (4), otherwise go to step (5)；
Step (4) calculates difference in magnitude Δ A and zero-sequence current triple-frequency harmonics phase of the zero-sequence current triple-frequency harmonics with respect to fundamental wave To the phase difference φ of fundamental wave：
If zero-sequence current triple-frequency harmonics is more than to adjust threshold value with respect to the difference in magnitude Δ A of fundamental wave, this is adjusted threshold value and takes 10%, And zero-sequence current triple-frequency harmonics with respect to fundamental wave phase difference φ within the scope of 120 °~240 °, then be judged as that height has occurred in circuit Earth fault is hindered, alarm signal is sent out；Otherwise it goes to step (5)；
Step (5) detection method is judged as that high resistance earthing fault does not occur for circuit, is latched alarm signal.
The features of the present invention and advantageous effect：
The present invention is directed to the defect that current conventional electrical distribution net high resistive fault detection method easily malfunctions under harmonic wave interference, fills Divide and excavate the phase changing capacity for being monitored each phase current of circuit and amplitude variation measure feature, it is proposed that zero-sequence current action assists sentencing According to, not only can guarantee Multi-harmonic Sources interference under high resistance earthing fault detection algorithm reliable locking, but also fully considered circuit height Hinder earth fault feature, to the maximum extent promoted detection method sensitivity, had both detection strong reliability with it is highly sensitive Degree.
Description of the drawings
Fig. 1 is the detection algorithm flow chart using the present invention.
Specific implementation mode
Power distribution network high resistance earthing fault detection method under Multi-harmonic Sources interference proposed by the present invention, in conjunction with attached drawing and implementation Detailed description are as follows for example：
Embodiment chooses power distribution network in the wind power plant comprising single time collection electric line, Neutral Point Through Low Resistance, wind turbine, collection Electric line and wind farm grid-connected system voltage grade are respectively 0.69kV, 35kV, 220kV, current collection total track length 20km, circuit A phase single-phase high-impedances occur for midpoint 5.0s, and fault point uses Cassie Arc Modellings, and what is emulated is wind farm grid-connected Three-phase current signal is illustrated as sample is implemented at substation exit, as shown in the table：
1 high resistive fault circuit three-phase current signal sampled value of table
(1) wind farm side acquires the current signal that circuit is measured in substation in real timeWherein φ is separate, packet Phase containing A, B phases and C phases, are then calculated zero-sequence current i according to the following formula0(t)：
i0(t)=iA(t)+iB(t)+iC(t)
(2) t is calculated0Each phase current operating frequency phase when=5s
The π f=100 of ω=2 π, T=1/f=0.02s
Then variable quantity of each phase current operating frequency phase in half of cycle is calculated
Δθa=| θa(t0=5.01)-θa(t0=5) |=0.52 °
Δθb=| θb(t0=5.01)-θb(t0=5) |=1.5 °
Δθc=| θc(t0=5.01)-θc(t0=5) |=1.16 °
Three-phase current operating frequency phase variable quantityWithin the scope of 0 °~90 °, it should go to step 3)；(3) each phase electricity is calculated Flow power frequency amplitude
Then variable quantity of each phase current power frequency amplitude in half of cycle is calculated
A phase current power frequency amplitude change ratesMore than 10%, and remaining biphase current power frequency amplitude change rateDo not surpass 10% is crossed, should be gone to step 4)；
(4) t is calculated0Difference in magnitude Δ A and phase difference φ of the zero-sequence current triple-frequency harmonics with respect to fundamental wave when=5s：
Zero-sequence current triple-frequency harmonics is more than 10% with respect to fundamental voltage amplitude Δ A, and triple-frequency harmonics Δ φ poor with respect to fundamental phase Within the scope of 120 °~240 °, it is judged as that high resistance earthing fault has occurred in circuit, sends out alarm signal.

Claims (1)

1. the power distribution network high resistance earthing fault detection method under a kind of Multi-harmonic Sources interference, which is characterized in that specifically include following Step：
Step (1) acquires the current signal that circuit is measured in distribution substation in real timeWhereinTo be separate, including A phases, B Phase, C phases and zero sequence calculate zero-sequence current i according to the following formula if scene can not measure zero-sequence current0(t)：
i0(t)=iA(t)+iB(t)+iC(t)
Step (2) calculates and detects each phase current operating frequency phase
Then wherein ω=2 π f=100 π, T=1/f=20ms calculate variation of each phase current operating frequency phase in half of cycle Amount
If a certain phase current operating frequency phase variable quantityWithin the scope of 90 °~180 °, and remaining biphase current operating frequency phase becomes Change amount is then gone to step (4) within the scope of 0 °~90 °；If three-phase current operating frequency phase variable quantityIn 0 °~90 ° ranges It is interior, then it goes to step (3)；Other situations are then gone to step (5)；
Step (3) calculates and detects each phase current power frequency amplitude
Then variable quantity of each phase current power frequency amplitude in half of cycle is calculated
If a certain phase current power frequency amplitude change rateIt is described to adjust threshold value value 10% more than adjusting threshold value, and remaining Biphase current power frequency amplitude change rateIt is less than and adjusts threshold value, then go to step (4), otherwise go to step (5)；
Step (4) calculates difference in magnitude Δ A and zero-sequence current triple-frequency harmonics of the zero-sequence current triple-frequency harmonics with respect to fundamental wave with respect to base The phase difference φ of wave：
If zero-sequence current triple-frequency harmonics is more than to adjust threshold value with respect to the difference in magnitude Δ A of fundamental wave, this is adjusted threshold value and takes 10%, and zero Sequence electric current triple-frequency harmonics with respect to fundamental wave phase difference φ within the scope of 120 °~240 °, then be judged as that circuit has occurred high resistant and connects Earth fault sends out alarm signal；Otherwise it goes to step (5)；
Step (5) detection method is judged as that high resistance earthing fault does not occur for circuit, is latched alarm signal.
CN201610514819.9A 2016-07-01 2016-07-01 Power distribution network high resistance earthing fault detection method under Multi-harmonic Sources interference Active CN105911434B (en)

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CN108037402B (en) * 2017-11-20 2019-04-09 华南理工大学 A kind of small resistance grounding system single-phase high-impedance detection method
CN108919054A (en) * 2018-07-05 2018-11-30 国网上海市电力公司 The intelligent power distribution network short circuit fault localization method estimated based on load and branch line
CN110687400B (en) * 2019-10-16 2021-07-20 东方电子股份有限公司 Method for filtering false start of transient recording type fault indicator
JP7300369B2 (en) * 2019-10-30 2023-06-29 オークマ株式会社 MONITORING DEVICE AND MONITORING METHOD FOR SPINDLE SPEED IN MACHINE TOOL, MACHINE TOOL
CN112710921B (en) * 2020-12-09 2021-10-08 山东大学 High-resistance fault line selection and section positioning method and system for resonance grounding system
CN112380775A (en) * 2020-12-29 2021-02-19 山东大学 Power distribution network arc light high resistance fault simulation method and system
CN117991047B (en) * 2024-04-03 2024-06-14 青岛鼎信通讯科技有限公司 High-resistance grounding fault wave recording method

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