A method for fault identification inside and outside the inverter station based on wavelet energy ratio
A wavelet energy, fault identification technology, applied in fault location, measurement of electrical variables, measurement of electricity and other directions, can solve the problems of DC system blocking, threat to the security and stability of the power grid, lack of fault identification ability, and achieve high reliability and wide application range. , the effect of good adaptability
Active Publication Date: 2022-04-29
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
In order to prevent the inverter station equipment from being damaged when a fault occurs in the inverter station area, the actual project configures multiple types of protection for the inverter station. Action events happen from time to time, and in severe cases, the DC system will be blocked, threatening the safety and stability of the power grid, that is, the partial protection of the inverter station lacks the ability to identify faults inside and outside the inverter station area
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[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0032] A method for identifying faults inside and outside the inverter station based on the wavelet energy ratio of the present invention comprises the following steps:
[0033] A. Data collection
[0034] at sampling frequency f s = 10kHz real-time current data collection: real-time collection of n converter transformers TB in the inverter station 1 ~TB n The three-phase current signals on the primary side are respectively i a_TB1 (t), i b_TB1 (t), i c_TB1 (t), i a_TB2 (t), i b_TB2 (t), i c_TB2 (t),...,i a_TBn (t), i b_TBn (t), i c_TBn (t); real-time acquisition of the three-phase current signal at the outlet of the AC filter, respectively i a_ACF (t), i b_ACF (t), i c_ACF (t), where t is the sampling moment.
[0035] B. Calculation of the modulus of the failure component
[0036] B1. Calculate the sum of current i of p...
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The invention discloses a fault identification method inside and outside the inverter station area based on the wavelet energy ratio, specifically: the high-frequency wavelet energy and the current fault component of the primary side of the converter transformer after calculating the current fault component modulus at the outlet of the AC filter The ratio of modulus to high-frequency wavelet energy k E After that, by judging k E The relationship with the fault identification threshold 5 realizes the identification of faults inside and outside the inverter station area, if k E <5, it is judged that the fault is an internal fault of the inverter station; if k E >5, it is judged that the fault is an out-of-area fault of the inverter station. The invention endows the inverter station with the ability to protect and identify faults inside and outside the inverter station without relying on long-distance communication. The impact of noise interference has good engineering application prospects.
Description
technical field [0001] The invention belongs to the technical field of fault identification inside and outside the inverter station, and in particular relates to a method for identifying faults inside and outside the inverter station based on wavelet energy ratios. Background technique [0002] The converter station is an important part of the AC-DC system. The protection of the converter station is used to protect the equipment in the station from failure threats, and plays a vital role in the protection of the AC-DC hybrid system. In order to prevent the inverter station equipment from being damaged when a fault occurs in the inverter station area, the actual project configures multiple types of protection for the inverter station. Action events occur from time to time, and in severe cases, the DC system will be blocked, threatening the safety and stability of the power grid, that is, the partial protection of the inverter station lacks the ability to identify faults insid...
Claims
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IPC IPC(8): G01R31/08
CPCG01R31/088Y04S10/52
Inventor 林圣许婷苇牟大林
Owner SOUTHWEST JIAOTONG UNIV