CN109596889A - A kind of low-voltage network line impedance on-line measurement system and method - Google Patents

A kind of low-voltage network line impedance on-line measurement system and method Download PDF

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Publication number
CN109596889A
CN109596889A CN201910025312.0A CN201910025312A CN109596889A CN 109596889 A CN109596889 A CN 109596889A CN 201910025312 A CN201910025312 A CN 201910025312A CN 109596889 A CN109596889 A CN 109596889A
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China
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line impedance
voltage
chip
distribution network
value
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CN201910025312.0A
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Inventor
范洁
陈霄
李新家
王黎明
严永辉
喻伟
熊政
李平
管诗骈
赵勇
刘飞
刘述波
徐博
戚文君
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Jiangsu Fangtian Power Technology Co Ltd
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Jiangsu Fangtian Power Technology Co Ltd
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Publication of CN109596889A publication Critical patent/CN109596889A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

一种低压配电网线路阻抗在线测量系统及方法,系统主要由主站平台和若干采集终端组成,采集终端由主处理器、计量芯片、存储芯片、时钟芯片、GPRS通信模块等主要部件组成,在主处理器控制下,首先通过时钟芯片获得时钟节拍,然后通过计量芯片测量获得配电网各节点处电压电流等基础电力信息,并记录于存储芯片,再通过处理器采用相关算法计算获得线路阻抗参数值,最后通过GPRS通信模块将数据传送至主站平台。本发明提出了一种经济技术可行的低压配电网线路阻抗在线测量系统及方法,对电网接入新的电力设备和系统评估,以及线路故障预判具有重要参考意义。

A low-voltage distribution network line impedance online measurement system and method. The system is mainly composed of a main station platform and a number of acquisition terminals. The acquisition terminal is composed of main components such as a main processor, a metering chip, a memory chip, a clock chip, and a GPRS communication module. Under the control of the main processor, the clock rhythm is first obtained through the clock chip, and then the basic power information such as voltage and current at each node of the distribution network is obtained through the measurement chip, and recorded in the memory chip, and then the processor uses the relevant algorithm to calculate and obtain the circuit. Impedance parameter value, and finally transmit the data to the main station platform through the GPRS communication module. The invention proposes an economically and technically feasible low-voltage distribution network line impedance online measurement system and method, which has important reference significance for grid access to new power equipment and system evaluation, and line fault prediction.

Description

A kind of low-voltage network line impedance on-line measurement system and method
Technical field
The invention belongs to low-voltage network line impedance fields of measurement, and in particular to a kind of low-voltage network line impedance exists Line measuring system and method.
Background technique
Nerve endings of the low-voltage network as entire bulk power grid, couples huge numbers of families, and operating status directly affects Power supply quality, the production of client, life are brought and are directly affected.Wherein, low-voltage network line impedance parameter is always electricity The key issues for netting research, accessing new power equipment and system evaluation and line fault anticipation to power grid has important ginseng Examine meaning.
Summary of the invention
The present invention aiming at the shortcomings in the prior art, provides a kind of low-voltage network line impedance on-line measurement system and side Method.
To achieve the above object, the invention adopts the following technical scheme:
A kind of low-voltage network line impedance on-line measurement system characterized by comprising main website platform and several acquisitions Terminal;The basic power information of the acquisition terminal measurement low-voltage network corresponding line, calculates line impedance parameter value, then Main website platform is sent to by GPRS network.
To optimize above-mentioned technical proposal, the concrete measure taken further include:
The acquisition terminal includes primary processor, metering chip, storage chip, clock chip, GPRS communication module, in master Under the control of processor, timeticks are obtained by clock chip first, it is each then to measure acquisition power distribution network by metering chip Basic power information at node, and it is recorded in storage chip, then calculate by primary processor and obtain line impedance parameter value, most Main website platform is transferred data to by GPRS communication module afterwards;Wherein, the basic power information includes voltage and current.
Furthermore, it is also proposed that a kind of measurement side using low-voltage network line impedance on-line measurement system as described above Method, which is characterized in that on acquisition terminal after electricity operation, with " day " for the period, execute following steps:
Step 1: resetting constant M, constant Rt, constant Sn;
Step 2: according to fixed intervals T, measurement obtains current voltage Uj, electric current Ij, wherein 1≤j≤N, N=24*60* 60/T;
Step 3: voltage Ui, the electric current Ii recorded according to previous cycle calculates voltage change Δ Ui=| Uj-Ui |, electricity Flow changing value Δ Ii=| Ij-Ii |, wherein i=j-1,0≤i≤N-1;
Step 4: route real-time impedance value Ri is calculated, if 0 < Δ Ui < UCLMT and Δ Ii ≠ 0, Ri=Δ Ui/ Δ Ii, M 1, the Rt that adds up adds up Ri, otherwise Ri=0, and wherein UCLMT indicates voltage jump exception limit value;
Step 5: judging whether the same day terminates, continue step 2 if being not finished, otherwise carry out step 6;
Step 6: calculatingWherein Ri ≠ 0, Ravg=Rt/M, Ravg indicate route Impedance mean value;
Step 7: line impedance real value R0, R1, R2 ... Rx of the statistics same day all measurements are in confidence intervalInterior quantity is K, wherein x=N-1;
Step 8: calculating line impedance parameter valueWherein Ri is in confidence intervalIt is interior;
Step 9: by GPRS module, same day line impedance parameter value RL being sent to main website platform.
T value 5 seconds, UCLMT value 4.0V.
The beneficial effects of the present invention are: proposing a kind of feasible low-voltage network line impedance on-line measurement of economic technology System and method, accessing new power equipment and system evaluation and line fault anticipation to power grid has important references meaning.
Detailed description of the invention
Fig. 1 is the whole composition schematic diagram of system.
Fig. 2 is acquisition terminal composition block diagram.
Fig. 3 is the flow diagram of method.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.
System integrally forms as shown in Figure 1, being mainly made of main website platform and several acquisition terminals, and acquisition terminal measurement is low The basic informations such as power grid corresponding line voltage and current are press-fitted, calculate line impedance parameter value, then send to by GPRS network Main website platform.
For acquisition terminal as key equipment, composition block diagram is as shown in Figure 2.Acquisition terminal by primary processor, metering chip, The main components such as storage chip, clock chip, GPRS communication module composition passes through clock core under primary processor control first Piece obtains timeticks, is then measured by metering chip and obtains the basic power information such as each voltage at node electric current of power distribution network, And it is recorded in storage chip, then calculate by processor using related algorithm and obtain line impedance parameter value, finally by GPRS Communication module transfers data to main website platform.
Measurement method is as follows:
On acquisition terminal after electricity operation, with " day " for the period, following steps are executed:
Step 1: resetting constant M, constant Rt, constant Sn;
Step 2: according to fixed intervals T, measurement obtains current voltage Uj, electric current Ij, wherein 1≤j≤N, N=24*60* 60/T, T value 5 seconds;
Step 3: voltage Ui, the electric current Ii recorded according to previous cycle, calculating voltage change Δ Ui (Δ Ui=| Uj-Ui |), current variation value Δ Ii (Δ Ii=| Ij-Ii |), wherein i=j-1,0≤i≤N-1;
Step 4: route real-time impedance value Ri is calculated, if 0 < Δ Ui < UCLMT and Δ Ii ≠ 0, Ri=Δ Ui/ Δ Ii, M 1, the Rt that adds up adds up Ri, otherwise Ri=0, and wherein UCLMT indicates voltage jump exception limit value, value 4.0V;
If Δ Ui > UCLMT, system thinks that this measurement point is power distribution network exception overshoot current or other abnormal generations, meter Automatic rejection falls this measurement point when calculation;
Step 5: judging whether the same day terminates, continue step 2 if being not finished, otherwise carry out step 6;
Step 6: calculatingWherein Ri ≠ 0, Ravg=Rt/M, Ravg indicate route Impedance mean value;
Line impedance number of measurement values is more, and Normal Distribution Characteristics can integrally be presented, and is calculated using normal distribution correlation formula, Further obtain effective sample;
Step 7: line impedance real value R0, R1, R2 ... Rx of the statistics same day all measurements are in confidence intervalInterior quantity is K, wherein x=N-1;
Step 8: calculating line impedance parameter valueWherein Ri is in confidence intervalIt is interior;
Step 9: by GPRS module, same day line impedance parameter value RL being sent to main website platform.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment, All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention Range.

Claims (4)

1.一种低压配电网线路阻抗在线测量系统,其特征在于,包括:主站平台和若干采集终端;所述采集终端测量低压配电网对应线路的基础电力信息,计算出线路阻抗参数值,再通过GPRS网络传送给主站平台。1. A low-voltage distribution network line impedance online measurement system, characterized in that it comprises: a main station platform and several acquisition terminals; the acquisition terminal measures the basic power information of the corresponding lines of the low-voltage distribution network, and calculates the line impedance parameter value , and then transmitted to the main station platform through the GPRS network. 2.如权利要求1所述的一种低压配电网线路阻抗在线测量系统,其特征在于:所述采集终端包括主处理器、计量芯片、存储芯片、时钟芯片、GPRS通信模块,在主处理器的控制下,首先通过时钟芯片获得时钟节拍,然后通过计量芯片测量获得配电网各节点处的基础电力信息,并记录于存储芯片,再通过主处理器计算获得线路阻抗参数值,最后通过GPRS通信模块将数据传送至主站平台;其中,所述基础电力信息包括电压电流。2. A low-voltage distribution network line impedance online measurement system as claimed in claim 1, characterized in that: the acquisition terminal comprises a main processor, a metering chip, a memory chip, a clock chip, and a GPRS communication module. Under the control of the controller, the clock tick is first obtained through the clock chip, and then the basic power information at each node of the distribution network is obtained through the measurement chip, and recorded in the memory chip, and then the line impedance parameter value is obtained through the calculation of the main processor. The GPRS communication module transmits data to the main station platform; wherein, the basic power information includes voltage and current. 3.一种采用如权利要求1或2所述的低压配电网线路阻抗在线测量系统的测量方法,其特征在于,采集终端上电运行后,以“日”为周期,执行如下步骤:3. a measurement method using the low-voltage distribution network line impedance online measurement system as claimed in claim 1 or 2, is characterized in that, after the collection terminal is powered on and runs, with "day" as a cycle, the following steps are performed: 步骤1:清零常数M、常数Rt、常数Sn;Step 1: Clear constant M, constant Rt, and constant Sn; 步骤2:按照固定间隔T,测量获得当前电压Uj、电流Ij,其中1≤j≤N,N=24*60*60/T;Step 2: According to the fixed interval T, measure and obtain the current voltage Uj and current Ij, where 1≤j≤N, N=24*60*60/T; 步骤3:根据前一周期记录的电压Ui、电流Ii,计算电压变化值ΔUi=|Uj-Ui|,电流变化值ΔIi=|Ij-Ii|,其中i=j-1,0≤i≤N-1;Step 3: Calculate the voltage change value ΔUi=|Uj-Ui| and the current change value ΔIi=|Ij-Ii| according to the voltage Ui and current Ii recorded in the previous cycle, where i=j-1, 0≤i≤N -1; 步骤4:计算线路实时阻抗值Ri,若0<ΔUi<UCLMT且ΔIi≠0,则Ri=ΔUi/ΔIi,M累加1,Rt累加Ri,否则Ri=0,其中UCLMT表示电压突变异常限值;Step 4: Calculate the real-time impedance value Ri of the line. If 0<ΔUi<UCLMT and ΔIi≠0, then Ri=ΔUi/ΔIi, M is accumulated by 1, and Rt is accumulated by Ri, otherwise Ri=0, where UCLMT represents the abnormal voltage mutation limit; 步骤5:判断当日是否结束,若未结束则继续进行步骤2,否则进行步骤6;Step 5: Determine whether the day ends, if not, proceed to Step 2, otherwise, proceed to Step 6; 步骤6:计算其中Ri≠0,Ravg=Rt/M,Ravg表示线路阻抗均值;Step 6: Calculate Where Ri≠0, Ravg=Rt/M, Ravg represents the mean value of line impedance; 步骤7:统计当日所有测量的线路阻抗实时值RO、R1、R2…Rx在置信区间内数量为K,其中x=N-1;Step 7: Count all measured line impedance real-time values RO, R1, R2...Rx in the confidence interval on the day The inner quantity is K, where x=N-1; 步骤8:计算出线路阻抗参数值其中Ri在置信区间内;Step 8: Calculate the line impedance parameter value where Ri is in the confidence interval Inside; 步骤9:通过GPRS模块,将当日线路阻抗参数值RL传送至主站平台。Step 9: The line impedance parameter value RL of the day is transmitted to the main station platform through the GPRS module. 4.如权利要求3所述的测量方法,其特征在于:T取值5秒,UCLMT取值4.0V。4. The measuring method according to claim 3, characterized in that: T takes a value of 5 seconds, and UCLMT takes a value of 4.0V.
CN201910025312.0A 2019-01-10 2019-01-10 A kind of low-voltage network line impedance on-line measurement system and method Pending CN109596889A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110297140A (en) * 2019-06-28 2019-10-01 北京机械设备研究所 A kind of failure prediction method and device of distribution system
CN111984925A (en) * 2020-07-29 2020-11-24 江苏方天电力技术有限公司 Circuit abnormity positioning method based on loop impedance, storage medium and computing equipment

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CN104698320A (en) * 2015-03-23 2015-06-10 济南大学 On-line measuring device and method for electrical parameters of power transmission and distribution line

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
CN104698320A (en) * 2015-03-23 2015-06-10 济南大学 On-line measuring device and method for electrical parameters of power transmission and distribution line

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110297140A (en) * 2019-06-28 2019-10-01 北京机械设备研究所 A kind of failure prediction method and device of distribution system
CN111984925A (en) * 2020-07-29 2020-11-24 江苏方天电力技术有限公司 Circuit abnormity positioning method based on loop impedance, storage medium and computing equipment
CN111984925B (en) * 2020-07-29 2024-03-12 江苏方天电力技术有限公司 Circuit abnormality positioning method based on loop impedance, storage medium and computing device

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