Ground fault line selection method for power plant power system
A plant power system, ground fault technology, applied in the fault location, measurement of electricity, measurement of electrical variables and other directions, can solve the problem of fault identification, misjudgment and missed judgment, etc., to improve the scope of application, good adaptability and reliability. Effect
Pending Publication Date: 2022-07-01
ZHEJIANG ZHENENG TECHN RES INST +1
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[0004] In order to solve the technical problem that the current traditional line selection scheme cannot guarantee that the sample data covers various complex fault situations, resulting in misjudgment and missed judgment in fault judgment, the present invention provides a power plant power system that can accurately make fault judgments Ground fault line selection method
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[0051] The method for selecting the ground fault line of the power system of the power plant proposed in this embodiment is to use the automatic terminal unit (FTU) installed at the outlet of the protected feeder to extract various parameters representing the operation state of the feeder under different operating states. Fault characteristic quantity. Define the s fault feature quantities measured in the kth operating state to constitute the historical sample X' k :
[0052] X' k =(x' k1 ,x′ k2 ,…,x′ ks ) (1)
[0053] In the formula: x′ k1 , …, x′ ks are the specific values of the s fault feature quantities extracted by the FTU, respectively.
[0054] Extract n historical samples under n operating states respectively to form a historical feature sample set X′={X′ 1 ,X′ 2 ,…,X′ n } T . Observing the original data sample set, it can be seen that there are obvious differences in the numerical size, unit and dimension of each fault feature quantity. If the original...
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The invention discloses a ground fault line selection method for an auxiliary power system of a power plant. A historical feature sample set is formed by extracting various fault feature quantities representing different operation states of a feeder line; when the grounding fault line selection protection device monitors that the zero sequence voltage of the system is greater than 10% of the phase voltage, line selection protection is started, and real-time data in a protected feeder line is collected to form a to-be-detected fault feature sample; performing unified normalization processing on the to-be-detected fault feature sample and the historical feature sample set, dividing historical data into a fault class and a non-fault class by means of a fuzzy c-means clustering algorithm, and solving a fault clustering center and a non-fault clustering center; and calculating distance similarity fault measurement between the normalized to-be-detected sample vector and the fault clustering center vector and distance similarity non-fault measurement between the normalized to-be-detected sample vector and the non-fault clustering center vector to form a line selection criterion.
Description
technical field [0001] The invention relates to a ground fault line selection method of a power system of a power plant. Background technique [0002] After a single-phase ground fault occurs in the power system of the power plant, whether the relay protection device can quickly and accurately select the ground fault line and act on the signal or trip is an important guarantee for the safe and stable operation of the power plant. The 6kV power system of the power plant generally adopts the indirect grounding method of the neutral point. It is easy to form arc grounding after a single-phase grounding fault occurs in the line. If the line selection device cannot select the faulty line in time, the fault will rapidly expand and upgrade to two points Or multiple short-circuits, or even cause system-wide overvoltage, resulting in equipment damage, power supply interruption and other adverse effects, posing a serious threat to the safe and stable operation of the power plant and t...
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IPC IPC(8): G01R31/08G01R31/52G01R31/58
CPCG01R31/088G01R31/086G01R31/52G01R31/58
Inventor 陈新琪许林波赵慧勉张浙波赵力航喻锟胥鹏博李理曾祥君王沾倪砚茹
Owner ZHEJIANG ZHENENG TECHN RES INST