Validity detection method of AC current flow sampling data in power system
A technology for power system and sampling data, which is applied in the field of real-time detection of sampling data of AC current, can solve the problems of large amount of calculation, long data window, poor real-time performance, etc., and achieves the effect of ensuring safe operation, improving reliability and high reliability.
Active Publication Date: 2016-12-07
长园深瑞继保自动化有限公司
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Problems solved by technology
[0003] Since the AC current of the power system is very different during the normal operation of the power system and when a fault occurs, it is difficult to distinguish the abnormal sampling data from the normal sampling data during the power system fault. Real-time judgment methods are still rare, and there are some shortcomings
For example, some methods require a long data window, poor real-time performance, and cannot be applied to fast protection; or are only applicable to linear systems, and cannot be applied to the detection of current and voltage secondary sampling data characterized by sinusoidal waveforms; or have a large amount of calculation , has high requirements on the CPU operation speed of the device; or can only detect a small number of typical abnormal values, which is not universal
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[0039] specific implementation plan
[0040] According to the common sense of the power system (system), when the system is in normal operation, it is considered that the electrical quantity of the system only has a non-attenuating fundamental wave component; when the system fails, the electrical quantity at different points in the system will have different degrees of jumps , and there will be attenuated DC components and harmonic components. Therefore, the AC current quantity i(t) of any phase in the three-phase transmission line of the power system at time t can be described by the following general expression:
[0041] i ( t ) = Σ I km ′ sin ( kωt + φ k 0 ) e - ...
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The invention discloses a method for detecting the validity of sampling data of alternating current in a power system, and the technical problem to be solved is to ensure the correctness of the sampling data and improve the reliability of relay protection. The method of the present invention comprises the following steps: the relay protection device collects the secondary sampling current of three points n-2, n-1, n, calculates the fast amplitude and the waveform coefficient of the fundamental wave component current, and presses the detection criterion: R ( n - 2 ) < δ Min { M ( n - 2 ) , M ( n - 1 ) , M ( n ) } > m Judging, if the detection criterion is met, then it is judged that the data i(n-2) of the re-sampled current at the n-2th sampling point is invalid data. Compared with the prior art, the present invention determines the waveform coefficient of the AC volume by calculating the rapid amplitude of the fundamental wave component of the AC volume, and judges the correctness of the sampling value based on the detection criterion, and has high reliability and good real-time performance , does not affect the characteristics of the relay protection action speed, provides a basis for relay protection, improves the reliability of relay protection, and ensures the safe operation of the power system.
Description
technical field [0001] The invention relates to a method for relay protection of a power system, in particular to a method for real-time detection of AC current sampling data. Background technique [0002] The relay protection device of the power system judges the operation status of the power system by collecting electrical physical quantities such as current and voltage, and then realizes the protection function. Invalid AC sampling data will cause incorrect operation or refusal of the relay protection device. Protection action behavior, causing unnecessary power outages or causing accident expansion, endangering the safe operation of the power system. Conventional substations connect the secondary circuit electrical quantities of traditional electromagnetic transformers to relay protection devices through cables, and the relay protection devices collect them centrally. The data collection process is relatively simple. With the vigorous promotion of strong smart grid cons...
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IPC IPC(8): G01R19/00
Inventor 陈远生占捷文潘军军祖连兴吴文举
Owner 长园深瑞继保自动化有限公司