CN109492867B - Anti-fake algorithm for voltage of power distribution station - Google Patents

Anti-fake algorithm for voltage of power distribution station Download PDF

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CN109492867B
CN109492867B CN201811167926.4A CN201811167926A CN109492867B CN 109492867 B CN109492867 B CN 109492867B CN 201811167926 A CN201811167926 A CN 201811167926A CN 109492867 B CN109492867 B CN 109492867B
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安义
李蓓蓓
邓才波
陈琛
范瑞祥
朱玉
谭姗姗
唐新宇
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Nanchang Kechen Electric Power Test And Research Co ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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Abstract

A distribution station area voltage anti-counterfeiting algorithm comprises the steps of firstly selecting a 10kV line voltage curve as a standard curve, secondly considering that three-phase voltages of Yyn0 distribution station areas at each acquisition point under the condition of three-phase unbalance are basically unequal, normalizing Dyn11 and Yyn0 distribution station area outlet voltages, and finally carrying out correlation calculation on a voltage curve of a detected distribution station area and the 10kV line voltage curve, wherein the larger the absolute value of a correlation coefficient is, the stronger the correlation between the detected distribution station area and the 10kV line voltage curve is, the smaller the possibility that a voltage device is added to the detected station area is, the closer the absolute value of the correlation coefficient is to 0, the weaker the correlation between the detected distribution station area and the 10kV line voltage curve is, and the larger the possibility that the voltage device is added to the detected station area is. The example shows that the device can accurately identify the voltage false making device of the distribution station area, and is suitable for large-scale application and popularization.

Description

Anti-fake algorithm for voltage of power distribution station
Technical Field
The invention relates to a power distribution station voltage anti-counterfeiting algorithm, and belongs to the technical field of power distribution and utilization.
Background
At present, a voltage regulating device is additionally arranged on a station area JP cabinet in an operation and maintenance unit due to the problem of voltage qualification rate index so as to achieve the purpose of improving the station area voltage qualification rate, but the problem of actual voltage of the station area is not really and effectively reflected, and further the voltage quality and distribution loss calculation of a station area user side are influenced.
When the actual voltage of the power distribution transformer area is smaller than 214V, the voltage data of the acquisition main station fluctuates around 217V through the input transformer area voltage adjusting device, when the actual voltage is larger than 232V, the voltage data of the acquisition main station fluctuates around 232V through the input transformer area voltage adjusting device, and when the actual voltage is between 214V and 232V, the voltage is an actual normal value.
Whether a voltage false device is installed in a power distribution station area or not is accurately identified, and the real and effective reflection of the actual voltage condition of the station area is necessary.
Disclosure of Invention
The invention aims to provide a distribution substation voltage anti-counterfeiting algorithm, which aims to solve the problem that operation and maintenance personnel in a substation do not need to power off to check whether a distribution substation is provided with a voltage anti-counterfeiting (adjusting) device or not.
The technical scheme of the invention is as follows, and the anti-fake algorithm for the voltage of the power distribution station area comprises the following steps:
(1) selecting a 10kV line voltage curve as a standard curve;
(2) considering that three-phase voltages of each acquisition point are basically unequal under the condition that the Yyn0 power distribution area is unbalanced in three phases, calculating outlet voltages of the Dyn11 power distribution area and the Yyn0 power distribution area to obtain a calculated voltage of the power distribution area;
(3) the voltage curve of the detected power distribution area and the voltage curve of the 10kV line are subjected to correlation calculation, the larger the absolute value of the correlation coefficient is, the stronger the correlation between the detected power distribution area and the voltage curve of the 10kV line is, the smaller the possibility that the voltage device is added to the detected power distribution area is, the closer the absolute value of the correlation coefficient is to 0, the weaker the correlation between the detected power distribution area and the voltage curve of the 10kV line is, and the larger the possibility that the voltage device is added to the detected power distribution area is.
The power distribution station area reduced voltage calculation method comprises the following steps:
dyn11 distribution substation area reduced voltage calculation:
short-circuit resistor R of distribution transformerkAnd short-circuit reactance XkIn order to obtain the required quantity,
Figure GDA0003214521990000021
when the voltage leading current is positive and vice versa, the active power and the reactive power corresponding to the three phases of the power utilization information acquisition system can be obtained:
Figure GDA0003214521990000022
Figure GDA0003214521990000023
Figure GDA0003214521990000024
wherein:
Figure GDA0003214521990000025
a, B, C phase voltage and current included angle;
the three-phase normalized voltage is calculated as follows:
Figure GDA0003214521990000026
Figure GDA0003214521990000027
Figure GDA0003214521990000028
wherein E isa1、Eb1、Ec1Normalizing the voltage for the distribution transformer;
averaging the three-phase reduced voltage of the distribution transformer, and using the voltage EdgTo represent the Dyn11 distribution outlet voltage, i.e.:
Figure GDA0003214521990000029
yyn0 power supply side voltage calculation:
for the Yyn0 distribution transformer, the primary normalized voltage calculation formula of the distribution transformer calculated from the Dyn11 power supply side voltage considering the neutral point voltage offset is as follows:
Figure GDA0003214521990000031
Figure GDA0003214521990000032
Figure GDA0003214521990000033
calculating E'a1、E′b1、E′c1The neutral point deviation of a Yyn0 distribution transformer is not considered, and a three-phase voltage cosine formula is established on the assumption that the voltages of the primary side three-phase power supply measuring lines of the distribution transformer are equal;
Figure GDA0003214521990000034
Figure GDA0003214521990000035
Figure GDA0003214521990000036
assume line voltage Eab、Eac、EbcEquality, equation (8) and (10), (9) and (11) are subtracted, yielding:
Figure GDA0003214521990000037
Figure GDA0003214521990000038
solving for beta by two unknowns of two equations1、β2E can be obtained according to the cosine formulaab、Eac、EbcAccordingly Ea、Eb、EcThe following equation:
Figure GDA0003214521990000039
by a voltage EygTo represent the Yyn0 distribution outlet voltage,
Figure GDA00032145219900000310
aiming at the problem of internal impedance of a Dyn11 power distribution area, the voltage drop generated by the internal impedance is taken into consideration through reduction, and the three-phase voltage obtained after the reduction of the power distribution area is averaged to obtain a final Dyn11 power distribution area reduced voltage curve.
Aiming at the problems of internal impedance and neutral point offset of a Yyn0 power distribution area, the voltage drop generated by the internal impedance and the neutral point voltage offset voltage are taken into consideration through reduction, and the three-phase voltage obtained after the reduction of the power distribution area is averaged to obtain a final reduced voltage curve of the Yyn0 power distribution area.
The invention carries out correlation calculation on the voltage curve of the detected power distribution area and the voltage curve of the 10kV line, and determines whether the power distribution area is provided with the voltage regulating device or not according to the magnitude of the correlation coefficient.
The method has the advantages that the algorithm does not need station operation and maintenance personnel to stop power to check whether the voltage false device is installed in the power distribution station, but utilizes the operation data of the distribution network to calculate the correlation between the voltage curve of the detected power distribution station and the voltage curve of the 10kV line, so that the online identification of whether the voltage regulating device is installed in the power distribution station is quickly and effectively realized, and the power supply reliability of the power distribution station is improved.
Drawings
Fig. 1 is a flow chart of a power distribution station voltage anti-counterfeiting algorithm of the invention.
Detailed Description
A specific embodiment of the present invention is shown in fig. 1.
The embodiment of the power distribution station voltage anti-counterfeiting algorithm comprises the following specific implementation steps:
(1) data pre-processing
Due to the problems of abnormity of the collector, interruption of communication and the like, false data and null data exist in the running data of the distribution transformer, so that the false data and the null data in the time sequence data of the distribution transformer are eliminated and emptied, and the fact that the three-phase voltage of the distribution transformer and the three-phase voltage of a line are at the same moment is ensured.
(2) Calculating the reduced voltage curve of the 10kV line
The three-phase voltage value of the 10kV line is basically unchanged, and the most average value of the three-phase voltage of the 10kV line is taken to obtain Emg。
(3) Calculating voltage curve after power distribution area normalization
A. Dyn11 distribution substation reduced voltage calculation
Because of distribution transformer one, the secondary has inside impedance, when distribution transformer district normal operating, will produce the pressure drop on inside impedance, for reducing distribution transformer inside impedance and producing the pressure drop problem, carry out the regression with distribution transformer district export measuring point voltage, contain the inside impedance production pressure drop into.
Short-circuit resistor R of distribution transformerkAnd short-circuit reactance XkIn order to obtain the required quantity,
Figure GDA0003214521990000051
the included angle between the voltage and the current is determined when the voltage leading current is positive and vice versa, and the active power and the reactive power corresponding to the three phases of the power utilization information acquisition system can be obtained:
θa＝arctan(Qa/Pa)
θb＝arctan(Qb/Pb) (1)
θc＝arctan(Qc/Pc)
the three-phase reduced voltage calculation is shown in formula 2, formula 3 and formula 4:
Figure GDA0003214521990000052
Figure GDA0003214521990000053
Figure GDA0003214521990000054
e calculated by the above formula (2), formula (3) and formula (4)a、Eb、EcThe voltage is restored for the distribution transformer. Averaging the three-phase reduced voltage of the distribution transformer, and using the voltage EdgTo represent the distribution outlet voltage, as shown in the following equation.
Figure GDA0003214521990000055
B. Yyn0 Power supply side Voltage calculation
For the Yyn0 distribution transformer, the primary normalized voltage calculation formula of the distribution transformer calculated from the Dyn11 power supply side voltage considering the neutral point voltage offset is as follows:
Figure GDA0003214521990000056
Figure GDA0003214521990000057
Figure GDA0003214521990000058
calculation of Ea、Eb、EcThe neutral point deviation of the Yyn0 distribution transformer is not considered, and a three-phase voltage cosine formula is established on the assumption that the voltages of the primary side three-phase power supply measuring lines of the distribution transformer are equal.
Figure GDA0003214521990000059
Figure GDA0003214521990000061
Figure GDA0003214521990000062
Assume line voltage Eab、Eac、EbcEqually, subtracting the three equations (8) and (10), (9) and (11) yields:
Figure GDA0003214521990000063
Figure GDA0003214521990000064
solving for beta by two unknowns of two equations1、β2E can be obtained according to the cosine formulaab、Eac、EbcAccordingly Ea、Eb、EcThe following formula:
Figure GDA0003214521990000065
by a voltage EygTo represent the Yyn0 distribution outlet voltage.
Figure GDA0003214521990000066
(4) And (3) carrying out correlation calculation on the voltage curve after the reduction of each distribution area and the voltage curve after the reduction of the 10kV line:
after calculating the 10kV line reduced voltage and the distribution area reduced voltage, obtaining the 10kV line and the detected distribution area voltage curve after reduction respectively, carrying out correlation calculation on the voltage curve of the detected distribution area and the 10kV line voltage curve, wherein the larger the absolute value of the correlation coefficient is, the stronger the correlation between the detected distribution area and the 10kV line voltage curve is, the lower the possibility that a voltage device is added to the detected distribution area is, the closer the absolute value of the correlation coefficient is to 0, the weaker the correlation between the detected distribution area and the 10kV line voltage curve is, the higher the possibility that the voltage device is added to the detected distribution area is, and the correlation coefficient formula is as follows:
Figure GDA0003214521990000067
wherein x isiIs a standard collection value of i moment voltage of 10kV line voltage, yiAnd acquiring a voltage acquisition value at the moment i of the detected station area.
(5) Judging whether to install voltage false (regulating) device according to correlation coefficient
The correlation coefficient is less than 0.8, the weaker the correlation between the detected distribution area and the voltage curve of the 10kV line is, the higher the possibility that the voltage regulating device is additionally arranged in the detected distribution area is, and the voltage false device can be arranged in the distribution area;
the correlation coefficient is larger than 0.8, the stronger the correlation between the detected distribution area and a 10kV line voltage curve is, the lower the possibility that a voltage device is additionally arranged in the detected distribution area is, or a voltage false device is not arranged in the distribution area.

Claims (2)

1. The power distribution station voltage anti-counterfeiting algorithm is characterized by comprising the following steps:
(1) selecting a 10kV line voltage curve as a standard curve;
(2) considering that three-phase voltages of each acquisition point are basically unequal under the condition that the Yyn0 power distribution area is unbalanced in three phases, calculating outlet voltages of the Dyn11 power distribution area and the Yyn0 power distribution area to obtain a calculated voltage of the power distribution area;
(3) the correlation calculation is carried out on the voltage curve of the detected power distribution area and the voltage curve of the 10kV line, the larger the absolute value of the correlation coefficient is, the stronger the correlation between the detected power distribution area and the voltage curve of the 10kV line is, the smaller the possibility that the voltage regulating device is additionally arranged in the detected power distribution area is, the closer the absolute value of the correlation coefficient is to 0, the weaker the correlation between the detected power distribution area and the voltage curve of the 10kV line is, and the larger the possibility that the voltage regulating device is additionally arranged in the detected power distribution area is;
the power distribution station area reduced voltage calculation method comprises the following steps:
(1) dyn11 distribution substation area reduced voltage calculation:
short-circuit resistor R of distribution transformerkAnd short-circuit reactance XkIn order to obtain the required quantity,
Figure FDA0003214521980000011
when the voltage leading current is positive and vice versa, the active power and the reactive power corresponding to the three phases of the power utilization information acquisition system can be obtained:
Figure FDA0003214521980000012
Figure FDA0003214521980000013
Figure FDA0003214521980000014
wherein:
Figure FDA0003214521980000015
a, B, C phase voltage and current included angle;
the three-phase normalized voltage is calculated as follows:
Figure FDA0003214521980000016
Figure FDA0003214521980000017
Figure FDA0003214521980000018
wherein E isa1、Eb1、Ec1Voltage is normalized for the Dyn11 distribution transformer; qa、Qb、QcRespectively representing A-phase reactive power, B-phase reactive power and C-phase reactive power at the outlet of the transformer area; pa、Pb、PcRespectively representing the active power of the phase A, the active power of the phase B and the active power of the phase C at the outlet of the transformer area;
averaging the three-phase reduced voltage of the distribution transformer, and using the voltage EdgTo represent the Dyn11 distribution outlet voltage, i.e.:
Figure FDA0003214521980000021
(2) calculating the reduced voltage of the Yyn0 power distribution station area:
for the Yyn0 distribution transformer, the primary normalized voltage calculation formula of the distribution transformer calculated from the Dyn11 power supply side voltage considering the neutral point voltage offset is as follows:
Figure FDA0003214521980000022
Figure FDA0003214521980000023
Figure FDA0003214521980000024
calculating E'a1、E′b1、E′c1The neutral point deviation of a Yyn0 distribution transformer is not considered, and a three-phase voltage cosine formula is established on the assumption that the voltages of the primary side three-phase power supply measuring lines of the distribution transformer are equal;
Figure FDA0003214521980000025
Figure FDA0003214521980000026
Figure FDA0003214521980000027
assume line voltage Eab、Eac、EbcAnd the same voltage is obtained by subtracting the primary reduced voltage of the phase C of the distribution transformer from the cosine formula of the three-phase voltage:
E'b1 2-E'c1 2-2E'a1E'b1cosβ1+2E'a1E'c1cosβ2＝0
E'a1 2-E'b1 2-2E'a1E'c1cosβ1+2E'b1E'c1cos(360-β1-β2)＝0
solving for beta by two unknowns of two equations1、β2E can be obtained according to the cosine formulaab、Eac、EbcAccordingly Ea、Eb、EcThe following equation:
Figure FDA0003214521980000031
by a voltage EygTo represent the Yyn0 distribution outlet voltage,
Figure FDA0003214521980000032
2. the distribution room voltage anti-counterfeiting algorithm according to claim 1, wherein the correlation calculation is performed to obtain the voltage curves of the 10kV line and the detected distribution room after calculating the reduced voltage of the 10kV line and the reduced voltage of the distribution room, respectively, and perform correlation calculation on the voltage curve of the detected distribution room and the voltage curve of the 10kV line, and the larger the absolute value of the correlation coefficient is, the stronger the correlation between the voltage curve of the detected distribution room and the voltage curve of the 10kV line is, the smaller the possibility of installing a voltage device in the detected distribution room is, the closer the absolute value of the correlation coefficient is to 0, the weaker the correlation between the voltage curve of the detected distribution room and the 10kV line is, the larger the possibility of installing a voltage device in the detected distribution room is, and the correlation coefficient formula is:
Figure FDA0003214521980000033
wherein x isiIs a standard collection value of i moment voltage of 10kV line voltage, yiA voltage acquisition value at the moment i of the detected station area;
Figure FDA0003214521980000034
is 10kV line NIndividual voltage acquisition point averages;
Figure FDA0003214521980000035
and averaging the N voltage acquisition points of the detected station area.
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