Optimal resonance elimination current calculation and implementation method for suppressing ferromagnetic resonance
A technology of current calculation and ferromagnetic resonance, which is applied to emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, and can solve the problems of different selection standards for harmonic elimination current, consumption of resonance energy, occurrence of Problems such as ferromagnetic resonance, to avoid serious heating and fast harmonic elimination
Pending Publication Date: 2022-08-09
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0005] The present invention provides a method for calculating and implementing the optimal harmonic elimination current for suppressing ferromagnetic resonance. The resonance energy is consumed within a certain period of time, and when the harmonic elimination measures are removed, the problem of ferromagnetic resonance will still occur
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[0063] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.
[0064] The present invention aims at different selection criteria of the harmonic elimination current of the existing flexible grounding devices and the existing methods for suppressing ferromagnetic resonance cannot consume resonance energy in a short time, and the problem of ferromagnetic resonance still occurs when the harmonic elimination measures are removed. , which provides an optimal harmonic elimination current calculation and realization method for suppressing ferromagnetic resonance.
[0065] like Figure 1 to Figure 10 As shown, the embodiment of the present invention provides an optimal harmonic elimination current calculation for suppressing ferromagnetic resonance, including: step 1, when a single-phase grounding fault ...
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The invention provides an optimal resonance elimination current calculation and implementation method for suppressing ferromagnetic resonance, and the method comprises the steps: 1, connecting a flexible grounding device when a neutral point non-effective grounding power distribution network has a single-phase grounding fault, and obtaining a ferromagnetic resonance suppression simplified circuit diagram of the flexible grounding power distribution network; 2, the flexible grounding device serves as a primary side resonance elimination resistor of the neutral point non-effective grounding power distribution network, a zero state response equivalent circuit and a zero input response equivalent circuit which are added into the resonance elimination resistor when the fault of the neutral point non-effective grounding power distribution network is removed are analyzed, and three damping vibration states are obtained. The neutral point non-effective grounding power distribution network is separated from the resonance state in a short time through the flexible grounding device, the resonance elimination speed is high, the secondary resonance overvoltage generated after the resonance elimination measure is removed is effectively avoided, the optimal resonance elimination current is obtained based on the critical resistance value, and the reliability is high. The problems of serious heating of the resonance elimination resistor, abnormal rising of voltage at two ends of the open triangle and the like caused by improper parameter selection are avoided.
Description
technical field [0001] The invention relates to the technical field of ferromagnetic resonance suppression in distribution networks, in particular to a method for calculating and implementing an optimal harmonic elimination current for suppressing ferromagnetic resonance. Background technique [0002] [1] Mei Chenglin, Zhang Chaoshu. Analysis of voltage transformer ferroresonance [J]. Power System Technology, 2008, 32(S2): 311-313. Mei Chenglin, Zhang Chaoshu. Analysis of voltage transformer ferroresonance[J]. Power System Technology , 2008, 32 (S2): 311-313. Disadvantages: In this paper, the method of suppressing ferromagnetic resonance through the grounding of the neutral point of the primary side of the PT by resistance, connecting a large resistance, the effect of harmonic elimination is better, but the resistance is too large will affect the sensitivity of the protection , and it will generate high heat, the heat capacity of the resistance is limited, and the resistance...
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IPC IPC(8): H02H7/26H02H7/05H02H9/00G01R31/08
CPCH02H7/26H02H7/05H02H9/007G01R31/088G01R31/085Y02E40/40
Inventor 王文卢盼刘鹏飞刘琼曾祥君
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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