技术领域technical field
本发明涉及电力系统故障定位技术领域，具体为一种高压直流输电系统接地极线路接地短路故障定位方法。The invention relates to the technical field of electric power system fault location, in particular to a method for locating a grounding short-circuit fault of a grounding electrode line of a high-voltage direct current transmission system.
背景技术Background technique
接地极是高压直流输电系统的重要组成部分，起到为不平衡电流提供通路、钳制中性点电压的作用。接地极线路距离较长、跨越地理环境复杂，线路故障的排查工作极其困难，因此在接地极线路发生故障后快速、准确地确定故障位置，有利于保障大电网的安全稳定运行。The grounding electrode is an important part of the HVDC transmission system, which plays the role of providing a path for the unbalanced current and clamping the neutral point voltage. The distance of the ground electrode line is long and the geographical environment is complex, so it is extremely difficult to troubleshoot the line fault. Therefore, after the ground electrode line fails, quickly and accurately determine the fault location, which is conducive to ensuring the safe and stable operation of the large power grid.
接地极线路的故障定位方法目前可分为三类，分别是脉冲注入法、行波法和故障分析法。目前投运的HVDC工程中，接地极线路普遍装设基于脉冲注入法的监测系统，即PEMO2000装置。该方法将特定频率的正弦脉冲信号注入接地极线路，测量脉冲信号在量测端与故障点之间折反射的时间进而计算故障距离。然而，工程实际中，由于在高频信号环境下阻抗监测机理的研究尚不充分，接地极线路阻抗监测系统存在对接地极线路瞬时性故障测距准确度不高的问题。行波法是以故障行波在线路上的传播规律为基础的故障定位方法，通过检测行波波头到达线路单端或双端的时刻进而计算故障距离；这种算法对行波波头定位的可靠性及波速的准确性要求很高，但是接地极线路故障信号不大，在折反射过程中衰减明显，这将给行波法测距的可靠性带来较大的挑战。故障分析法是基于故障阻抗分布规律的故障定位方法，该方法利用接地极线路量测端采集的电气量、线路等效电路及线路参数来分析故障特征，并基于此构造特定的测距算法，进而得到故障位置，然而现有算法受过渡电阻影响较大，高阻故障时测距精度较低，仍无法保证接地极线路远端、高阻故障时的定位精度，且由于算法需要在全线范围内迭代搜索故障点，较大的计算量无疑会导致求解过程繁琐复杂。The fault location methods of grounding electrode lines can be divided into three categories at present, which are pulse injection method, traveling wave method and fault analysis method. In the HVDC projects currently in operation, the monitoring system based on the pulse injection method is generally installed on the grounding electrode line, that is, the PEMO2000 device. In this method, a sinusoidal pulse signal of a specific frequency is injected into the ground electrode line, and the refraction time of the pulse signal between the measuring terminal and the fault point is measured to calculate the fault distance. However, in engineering practice, due to the insufficient research on the impedance monitoring mechanism in the high-frequency signal environment, the grounding electrode line impedance monitoring system has the problem that the accuracy of instantaneous fault location of the grounding electrode line is not high. The traveling wave method is a fault location method based on the propagation law of the fault traveling wave on the line, and calculates the fault distance by detecting the time when the traveling wave head reaches the single end or both ends of the line; The accuracy requirement is very high, but the fault signal of the ground electrode line is not large, and the attenuation is obvious in the process of catadioptric reflection, which will bring great challenges to the reliability of the distance measurement by the traveling wave method. The fault analysis method is a fault location method based on the fault impedance distribution law. This method uses the electrical quantity collected at the measurement end of the ground electrode line, the line equivalent circuit and line parameters to analyze the fault characteristics, and based on this, a specific distance measurement algorithm is constructed. Then the fault location is obtained. However, the existing algorithm is greatly affected by the transition resistance, and the ranging accuracy is low in the event of a high-resistance fault. In the iterative search for fault points, a large amount of calculation will undoubtedly lead to a cumbersome and complicated solution process.
发明内容Contents of the invention
针对上述问题，本发明的目的在于提供一种不受故障位置、过渡电阻、信号噪声等因素的影响，具有较高的测距精度和较强的抗噪声干扰能力，且在实际工程中便于实现的高压直流输电系统接地极线路接地短路故障定位方法。技术方案如下：In view of the above problems, the object of the present invention is to provide a device that is not affected by factors such as fault location, transition resistance, signal noise, etc., has high ranging accuracy and strong anti-noise interference ability, and is easy to realize in actual engineering. The ground fault location method of ground electrode line in HVDC transmission system. The technical solution is as follows:
一种高压直流输电系统接地极线路接地短路故障定位方法，包括以下步骤：A method for locating a grounding short-circuit fault of a grounding electrode line in a high-voltage direct current transmission system, comprising the following steps:
步骤A：数据采集Step A: Data Acquisition
高压直流输电系统的控制保护系统检测接地极线路是否发生故障，若检测到故障，则获取接地极中性母线电压信号U(t)、第一条接地极线路l1的电流信号I1(t)和第二条接地极线路l2的电流信号I2(t)，其中t表示采样时刻；The control and protection system of the HVDC power transmission system detects whether there is a fault in the grounding electrode line. If a fault is detected, the voltage signal U(t) of the neutral busbar of the grounding electrode and the current signalI 1( t ) and the current signal I2 (t) of the second ground electrode line l2 , where t represents the sampling moment;
步骤B：数据处理Step B: Data Processing
利用全波傅里叶算法提取接地极中性母线的电压信号U(t)、第一条接地极线路l1的电流信号I1(t)和第二条接地极线路l2的电流信号I2(t)的特征谐波分量，分别得到接地极中性母线的特征谐波电压值Un、第一条接地极线路l1的特征谐波电流值I1n和第二条接地极线路l2的特征谐波电流值I2n；Using the full-wave Fourier algorithm to extract the voltage signal U(t) of the neutral bus of the grounding pole, the current signal I1 (t) of the first grounding pole line l1 and the current signal I of the second grounding pole line l22 (t), the characteristic harmonic voltage value Un of the grounding pole neutral bus, the characteristic harmonic current value I1n of the first grounding pole line l1 and the second grounding pole line l2 characteristic harmonic current value I2n ;
步骤C：计算特征谐波测量阻抗Step C: Calculating the Characteristic Harmonic Measured Impedance
根据接地极中性母线的特征谐波电压值Un、第一条接地极线路l1的特征谐波电流值I1n和第二条接地极线路l2的特征谐波电流值I2n，分别计算出第一条接地极线路l1的特征谐波阻抗Z1n＝Un/I1n和第二条接地极线路l2的特征谐波阻抗Z2n＝Un/I2n；According to the characteristic harmonic voltage value Un of the grounding pole neutral bus, the characteristic harmonic current value I 1n of the first grounding pole line l1 and the characteristic harmonic current value I2n of thesecond grounding pole line l2 , respectively calculate the characteristic harmonic impedance Z1n =Un /I1n of the first ground electrode line l1 and the characteristic harmonic impedance Z2n =Un /I2 of the second ground electrode line l2n ;
步骤D：判断接地极线路接地短路的故障支路Step D: Determine the faulty branch of the grounding electrode line grounding short circuit
D1：由下式计算出两条接地极线路的特征谐波测量阻抗幅值的比值k：D1: Calculate the ratio k of the measured impedance amplitudes of the characteristic harmonics of the two ground electrode lines by the following formula:
k＝|Z1n|/|Z2n|k＝|Z1n |/|Z2n |
D2：将特征谐波测量阻抗幅值的比值k与设定的故障分支判断阈值kset进行比较；若k<kset，则判断接地短路故障发生在第一条接地极线路l1上；若k>1/kset，则判断接地短路故障发生在第二条接地极线路l2上；D2: Compare the ratio k of the characteristic harmonic measured impedance amplitude with the set fault branch judgment threshold kset ; if k<kset , it is judged that the grounding short-circuit fault occurred on the first grounding electrode line l1 ; if k>1/kset , then it is judged that the ground short circuit fault occurs on the second ground electrode line l2 ;
步骤E：确定接地极线路接地短路的故障距离Step E: Determining the distance to fault for a short circuit to ground in the ground electrode line
当判断接地短路故障发生在第一条接地极线路l1上时，通过下式计算故障点离接地极中性母线的距离xf1：When it is judged that the grounding short-circuit fault occurs on the first grounding pole linel1 , the distance xf1 between the fault point and the neutral busbar of the grounding pole is calculated by the following formula:
当判断接地短路故障发生在第二条接地极线路l2上时，通过下式计算故障点离接地极中性母线的距离xf2：When it is judged that the grounding short-circuit fault occurs on the second grounding pole line l2 , the distance xf2 between the fault point and the neutral busbar of the grounding pole is calculated by the following formula:
上述两式中l为第一条接地极线路l1和第二条接地极线路l2的长度，Zn为接地极线路的单位特征谐波阻抗，Rg为接地极的极址电阻。In the above two formulas, l is the length of the first ground electrode linel1 and the second ground electrode linel2 , Zn is the unit characteristic harmonic impedance of the ground electrode line, and Rg is the pole address resistance of the ground electrode.
进一步的，所述步骤D2中判断阈值kset为0.95。Further, the judgment threshold kset in the step D2 is 0.95.
更进一步的，所述步骤A中的采样频率为大于等于1.2kHz。Furthermore, the sampling frequency in the step A is greater than or equal to 1.2 kHz.
本发明的有益效果是：The beneficial effects of the present invention are:
1)本发明具有较高的精度。本发明利用两条接地极线路特征谐波测量阻抗比值的特征判定故障支路，并基于具体的特征谐波测量阻抗的测距函数进行故障定位，且测距函数从原理上消除了过渡电阻的影响，并且该定位方法在接地极线路全线范围内最大相对定位误差很小，具有较高的精度；1) The present invention has higher precision. The present invention utilizes the characteristics of the characteristic harmonic measurement impedance ratio of two ground electrode lines to determine the fault branch, and performs fault location based on the ranging function of the specific characteristic harmonic measurement impedance, and the ranging function eliminates the transition resistance in principle Influence, and this positioning method has a small maximum relative positioning error within the entire range of the grounding electrode line, and has high accuracy;
2)本发明可靠性强。本发明在接地极线路全线范围内均能可靠的判断故障支路并精确的定位故障，克服了已有方法在发生高阻接地故障时由于两条线路电流差别小导致的误判问题，且定位结果不受故障位置、过渡电阻、信号噪声等因素的影响，具有较强的可靠性；2) The present invention has strong reliability. The present invention can reliably judge the fault branch and accurately locate the fault within the entire range of the grounding electrode line, overcomes the misjudgment problem caused by the small current difference between the two lines when a high-resistance grounding fault occurs in the existing method, and can locate The result is not affected by factors such as fault location, transition resistance, signal noise, etc., and has strong reliability;
3)本发明操作简单，便于实际工程运用。本发明仅需要从接地极线路量测端录波数据中提取各电气信号的特征谐波分量，继而对两条接地极线路特征谐波测量阻抗进行相应计算便可实现故障支路判别和故障定位过程，操作简单；同时测距方程运算结果为唯一值，无需繁琐的搜索和迭代过程，算法简单；且本发明方法仅利用系统中已有的单端可测的电气测量装置和保护装置，无需增加硬件设备，便于工程应用。3) The present invention is simple in operation and convenient for practical engineering application. The present invention only needs to extract the characteristic harmonic components of each electrical signal from the wave recording data of the measuring end of the grounding electrode line, and then perform corresponding calculations on the measured impedance of the characteristic harmonics of the two grounding electrode lines to realize fault branch discrimination and fault location process, the operation is simple; at the same time, the calculation result of the distance measurement equation is a unique value, without the need for cumbersome search and iterative processes, and the algorithm is simple; Adding hardware equipment is convenient for engineering application.
附图说明Description of drawings
图1为本发明仿真实验中第二条接地极线路l2发生接地故障的示意图。FIG.1 is a schematic diagram of a ground fault occurring on the second ground electrode line 12 in the simulation experiment of the present invention.
具体实施方式Detailed ways
下面结合具体实施例对本发明做进一步详细说明。The present invention will be described in further detail below in conjunction with specific embodiments.
一种高压直流输电系统接地极线路接地短路故障的定位方法，其步骤为：A method for locating a grounding short-circuit fault of a grounding electrode line of a high-voltage direct current transmission system, the steps of which are as follows:
A、数据采集A. Data collection
高压直流输电系统的控制保护系统检测接地极线路是否发生故障，若检测到故障，则获取接地极中性母线电压信号U(t)、第一条接地极线路l1的电流信号I1(t)和第二条接地极线路l2的电流信号I2(t)，其中t表示采样时刻；The control and protection system of the HVDC power transmission system detects whether there is a fault in the grounding electrode line. If a fault is detected, the voltage signal U(t) of the neutral busbar of the grounding electrode and the current signalI 1( t ) and the current signal I2 (t) of the second ground electrode line l2 , where t represents the sampling moment;
B、数据处理B. Data processing
接地极线路故障定位装置对电气测量装置发送来的数据进行以下处理：The ground electrode line fault location device performs the following processing on the data sent by the electrical measuring device:
利用全波傅里叶算法提取电压信号U(t)、电流信号I1(t)和电流信号I2(t)的特征谐波分量，分别得到接地极中性母线的特征谐波电压值Un、第一条接地极线路l1的特征谐波电流值I1n和第二条接地极线路l2的特征谐波电流值I2n，其中特征谐波频率为600Hz；The characteristic harmonic components of voltage signal U(t), current signal I1 (t) and current signal I2 (t) are extracted by full-wave Fourier algorithm, and the characteristic harmonic voltage value U of the grounded neutral bus is respectively obtainedn , the characteristic harmonic current value I 1n of the first ground electrode line l1 and the characteristic harmonic current value I2n of thesecond ground electrode line l2 , wherein the characteristic harmonic frequency is 600Hz;
C、特征谐波测量阻抗的计算C. Calculation of characteristic harmonic measurement impedance
接地极线路故障定位装置根据接地极中性母线的特征谐波电压值Un，第一条接地极线路l1的特征谐波电流值I1n和第二条接地极线路l2的特征谐波电流值I2n，分别计算出第一条接地极线路l1的特征谐波阻抗Z1n＝Un/I1n和第二条接地极线路l2的特征谐波阻抗Z2n＝Un/I2n；The ground electrode line fault location device is based on the characteristic harmonic voltage value Un of the ground electrode neutral bus, the characteristic harmonic current value I 1 n of the first ground electrode line l1 and the characteristic harmonic current value I1n of the second ground electrode line l2 Wave current value I2n , respectively calculate the characteristic harmonic impedance Z1n of the first grounding electrode line l1 = Un /I1n and the characteristic harmonic impedance Z2n of the second grounding electrode line l2 =Un /I2n ;
D、接地极线路接地短路故障支路的判断D. Judgment of grounding short-circuit fault branch of grounding electrode line
D1、接地极线路故障定位装置由下式计算出两条接地极线路的特征谐波测量阻抗幅值的比值k：D1. Ground electrode line fault location device Calculate the ratio k of the measured impedance amplitudes of the characteristic harmonics of the two ground electrode lines by the following formula:
k＝|Z1n|/|Z2n|k＝|Z1n |/|Z2n |
D2、故障定位装置将特征谐波测量阻抗幅值的比值k与设定的故障分支判断阈值kset进行比较；若k<kset，则判断接地短路故障发生在第一条接地极线路l1上；若k>1/kset，则判断接地短路故障发生在第二条接地极线路l2上。本实施例中判断阈值kset取0.95，则1/kset为1.053。D2. The fault location device compares the ratio k of the characteristic harmonic measured impedance amplitude with the set fault branch judgment threshold kset ; if k<kset , it is judged that the grounding short circuit fault occurred on the first grounding electrode line l1 above; if k>1/kset , it is judged that the grounding short-circuit fault occurs on the second grounding electrode line l2 . In this embodiment, the judgment threshold kset is 0.95, and 1/kset is 1.053.
E、接地极线路接地短路故障距离的确定E. Determination of grounding short-circuit fault distance of grounding electrode line
当接地极线路故障定位装置判断接地短路故障发生在第一条接地极线路l1上时；接地极线路故障定位装置通过下式计算故障点离接地极中性母线的距离xf1：When the ground electrode line fault location device judges that the ground short circuit fault occurs on the first ground electrode linel1 ; the ground electrode line fault location device calculates the distance xf1 between the fault point and the ground electrode neutral bus by the following formula:
当接地极线路故障定位装置判断接地短路故障发生在第二条接地极线路l2上时；接地极线路故障定位装置通过下式计算故障点离接地极中性母线的距离xf2：When the ground electrode line fault location device judges that the ground short circuit fault occurs on the second ground electrode linel2 ; the ground electrode line fault location device calculates the distance xf2 between the fault point and the ground electrode neutral bus by the following formula:
上述两式中l为第一条接地极线路l1和第二条接地极线路l2的长度、Zn为接地极线路的单位特征谐波阻抗、Rg为接地极的极址电阻。In the above two formulas, l is the length of the first ground electrode linel1 and the second ground electrode linel2 , Zn is the unit characteristic harmonic impedance of the ground electrode line, and Rg is the pole address resistance of the ground electrode.
本发明故障定位方法的原理如下：The principle of the fault location method of the present invention is as follows:
接地极线路由双回并行的架空线路组成，特征谐波测量阻抗总体呈感性，其特征主要由线路等效电路及阻抗参数决定。当接地极线路正常运行时，两条并联的接地极线路流过的特征谐波电流等值同向、特征谐波测量阻抗相同；当其中的一条接地极线路发生接地故障时，其等效电路发生改变，此线路的特征谐波电流急剧增大、特征谐波测量阻抗急剧减小，而另一条未故障的接地极线路的特征谐波测量阻抗基本保持不变。那么，利用两条接地极线路的特征谐波测量阻抗的比值便能确定故障支路。The ground electrode line is composed of double-circuit parallel overhead lines. The characteristic harmonic measurement impedance is generally inductive, and its characteristics are mainly determined by the line equivalent circuit and impedance parameters. When the ground electrode lines are in normal operation, the characteristic harmonic currents flowing through the two parallel ground electrode lines are equivalent in the same direction, and the characteristic harmonic measurement impedance is the same; when a ground fault occurs in one of the ground electrode lines, its equivalent circuit Changes occur, the characteristic harmonic current of this line increases sharply, and the characteristic harmonic measurement impedance decreases sharply, while the characteristic harmonic measurement impedance of another unfaulted ground electrode line remains basically unchanged. Then, the fault branch can be determined by using the ratio of the measured impedance of the characteristic harmonics of the two ground electrode lines.
当第一条接地极线路l1的特征谐波阻抗幅值与第二条接地极线路l2的特征谐波阻抗幅值的比值为小于kset时，则判断第一条接地极线路l1发生接地故障；当第一条接地极线路l1的特征谐波阻抗幅值与第二条接地极线路l2的特征谐波阻抗幅值的比值为大于1/kset时，则判断第二条接地极线路l2发生接地故障。When the ratio of the characteristic harmonic impedance amplitude of the first ground electrode line l1 to the characteristic harmonic impedance amplitude of the second ground electrode line l2 is less than kset , then judge the first ground electrode line l1 A ground fault occurs; when the ratio of the characteristic harmonic impedance amplitude of the first ground electrode line l1 to the characteristic harmonic impedance amplitude of the second ground electrode line l2 is greater than 1/kset , the second A ground fault occurs on the ground electrode line l2 .
确定故障支路后，若接地短路故障发生在第二条接地极线路l2上时，设故障点离接地极中性母线的距离为xf2，将电路等效图利用△-Y连接等效变换，简化后得此时第一条接地极线路l1的特征谐波阻抗Z1n与第二条接地极线路l2的特征谐波阻抗Z2n为：After determining the faulty branch, if the grounding short circuit fault occurs on the second grounding pole line l2 , set the distance between the fault point and the grounding pole neutral bus as xf2 , and use the △-Y connection equivalent of the circuit equivalent diagram After transformation and simplification, the characteristic harmonic impedance Z 1n of the first ground electrode line l1 and the characteristic harmonic impedance Z2n of thesecond ground electrode line l2 are:
将上式联立消去过渡电阻Rd后得第二条接地极线路l2的特征谐波阻抗Z2n为：The characteristic harmonic impedance Z2n of the second grounding electrode line l2 is obtained by simultaneously eliminating the transition resistance Rd from the above formula:
由上式可得，第二条接地极线路l2故障点离接地极中性母线的距离xf2：From the above formula, the distance xf2 between the fault point of the second grounding electrode line l2 and the neutral bus bar of the grounding electrode:
同理，当第一条接地极线路l1发生接地故障时，可得第一条接地极线路l1故障点离接地极中性母线的距离xf1：Similarly, when a ground fault occurs on the first grounding pole linel1 , the distance xf1 between the fault point of thefirst grounding pole line l1 and the neutral bus bar of the grounding pole can be obtained:
上述xf1与xf2的表达式中，l为第一条接地极线路l1l1和第二条接地极线路l2的长度、Zn为接地极线路的单位特征谐波阻抗、Rg为接地极的极址电阻。In the above expressions of xf1 and xf2 , l is the length of the first ground electrode line l1 l1 and the second ground electrode line l2 , Zn is the unit characteristic harmonic impedance of the ground electrode line, Rg is the address resistance of the ground electrode.
因此可知，在对接地极线路接地短路故障支路进行判断之后，可根据xf1与xf2的表达式进一步确定故障点到中性母线的距离。且在xf1与xf2的表达式中不含有过渡电阻Rd，即本发明提出的接地极线路的故障定位方法不受过渡电阻的影响。据此测距函数准确的确定了故障支路的故障位置，从而本发明能够进行精准的故障定位。Therefore, it can be seen that after judging the grounded short-circuit fault branch of the ground electrode line, the distance from the fault point to the neutral bus can be further determined according to the expressions of xf1 and xf2 . Moreover, the expressions of xf1 and xf2 do not contain the transition resistance Rd , that is, the fault location method for the ground electrode line proposed by the present invention is not affected by the transition resistance. According to this, the ranging function accurately determines the fault location of the fault branch, so that the present invention can perform precise fault location.
仿真实验：Simulation:
为验证所提方法在的有效性和可靠性，根据实际工程参数基于PSCAD/EMTDC软件搭建含接地极系统的±800kV/5kA双极高压直流输电系统仿真模型。模型中直流输电系统额定输送容量为8000MW，输电线路长度为1652km。其接地极系统中，极址电阻为0.2Ω，线路长度为101.4km，线路采用Bergeron模型。In order to verify the effectiveness and reliability of the proposed method, a simulation model of a ±800kV/5kA bipolar HVDC transmission system including a grounding electrode system is built based on the actual engineering parameters based on PSCAD/EMTDC software. The rated transmission capacity of the DC transmission system in the model is 8000MW, and the length of the transmission line is 1652km. In the ground electrode system, the electrode address resistance is 0.2Ω, the line length is 101.4km, and the line adopts the Bergeron model.
在本文的仿真模型中，设置第二条接地极线路l2在1s时发生单线接地故障，故障距离xf2＝30km，过渡电阻Rd分别为0Ω、100Ω及200Ω，设置电压、电流的采样频率为10kHz，取阈值kset＝0.95，1/kset＝1.053。In the simulation model of this paper, set the second ground electrode line l2 to have a single-line ground fault in 1s, the fault distance xf2 = 30km, the transition resistance Rd is 0Ω, 100Ω and 200Ω respectively, and the sampling frequency of voltage and current is set is 10kHz, the threshold kset =0.95, 1/kset =1.053.
采用全波傅里叶算法提取电压信号U(t)、电流信号I1(t)和电流信号I2(t)的特征谐波分量，分别得到接地极中性母线的特征谐波电压值Un、第一条接地极线路l1的特征谐波电流值I1n和第二条接地极线路l2的特征谐波电流值I2n，计算两线路特征谐波测量阻抗值，利用两者的比值判定故障支路并通过测距方程求解故障距离，具体的仿真计算结果如下表所示。其中相对定位误差定义：The characteristic harmonic components of the voltage signal U(t), current signal I1 (t) and current signal I2 (t) are extracted by using the full-wave Fourier algorithm, and the characteristic harmonic voltage values U of the grounded neutral bus are respectively obtainedn , the characteristic harmonic current value I 1n of the first grounding electrode line l1 and the characteristic harmonic current value I2n of the second grounding electrode line l2 , calculate the measured impedance values of the characteristic harmonics of thetwo lines, and use the two The fault branch is judged by the ratio of the two, and the fault distance is solved by the ranging equation. The specific simulation calculation results are shown in the following table. Where the relative positioning error is defined as:
故障定位结果Fault location result
由表可知，在本发明仿真案例中，第一条接地极线路l1的特征谐波测量阻抗Z1n故障后略微变化。第二条接地极线路l2的特征谐波测量阻抗Z2n的幅值显著减小，过渡电阻越小，幅值变化量越大；Z2n的相角显著减小，与阻抗幅值相反，过渡电阻越大，相角变化量越大。虽然线路特征谐波测量阻抗会受到过渡电阻的影响，但是本发明所提的定位方法在计算故障距离时能够从原理上消除过渡电阻。从仿真案例的定位结果可以看出，本发明所采用的定位方案能够正确地判定故障支路，且定位结果误差较小，具有较高的精度。It can be seen from the table that in the simulation case of the present invention, the characteristic harmonic measurement impedance Z1n of the first ground electrode line l1 changes slightly after a fault. The amplitude of the characteristic harmonic measurement impedance Z2n of the second ground electrode line l2 is significantly reduced, and the smaller the transition resistance, the greater the amplitude change; the phase angle of Z2n is significantly reduced, and the impedance amplitude On the contrary, the larger the transition resistance, the larger the phase angle change. Although the line characteristic harmonic measurement impedance will be affected by the transition resistance, the positioning method proposed by the present invention can eliminate the transition resistance in principle when calculating the fault distance. From the positioning results of the simulation case, it can be seen that the positioning scheme adopted by the present invention can correctly determine the faulty branch, and the positioning result has a small error and high precision.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910583162.5ACN110221179B (en) | 2019-07-01 | 2019-07-01 | A method for locating grounding short-circuit faults in grounding pole lines of high-voltage direct current transmission systems |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910583162.5ACN110221179B (en) | 2019-07-01 | 2019-07-01 | A method for locating grounding short-circuit faults in grounding pole lines of high-voltage direct current transmission systems |
| Publication Number | Publication Date |
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| CN110221179Atrue CN110221179A (en) | 2019-09-10 |
| CN110221179B CN110221179B (en) | 2020-06-09 |
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| CN201910583162.5AActiveCN110221179B (en) | 2019-07-01 | 2019-07-01 | A method for locating grounding short-circuit faults in grounding pole lines of high-voltage direct current transmission systems |
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