A method and device for obtaining active compensation current
A technology for compensating current and obtaining methods, which is applied in the field of power systems and can solve problems such as changing the structure of passive compensation systems
Active Publication Date: 2021-06-25
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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[0004] This application provides an active compensation current acquisition method and device to solve the problem of changing the structure of the original passive compensation system when passive compensation technology and active compensation technology are combined
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[0035] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.
[0036] figure 1 For a flow chart of an active compensation current acquisition method provided in the embodiment of the present application, see figure 1 , the method includes:
[0037] S101, obtaining the first detection current I output by the active compensator s1 , the second detection current I s2 and the third detection current I s3 . In addition, the first detection current I s1 , the second detection current I s2 and the third detection current I s3 The frequency amplitudes are all between 0.5A and 5A. When the active compensator outputs the first detection current, the second detection current and the third detection current, ensure that the system neutral point voltage does ...
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This application discloses a method and device for obtaining active compensation current, which respectively obtain the voltages of each phase of the system and the neutral point voltage of the system corresponding to the first detection current, the second detection current and the third detection current, as well as the phase lagging phase of the target phase. Voltage, target phase-to-phase voltage and target phase-leading phase-to-phase voltage; calculate the zero-sequence admittance of each phase of the system, the zero-sequence admittance of the target phase lagging phase, the zero-sequence admittance of the target phase leading phase, and the arc-suppression coil conductance when single-phase is grounded According to the zero-sequence admittance of the lagging phase of the target phase, the zero-sequence admittance of the leading phase of the target phase and the arc suppressing coil admittance of the single-phase grounding, the active compensation current of the target phase when the single-phase grounding occurs is obtained. The technical solution of this application does not need to withdraw from the damping resistance of the arc suppression coil. On the premise of not changing the compensation circuit of the original arc suppression coil, the calculation of the full compensation value of the ground current of the active compensator is carried out, which solves the problem of passive compensation technology and active compensation. When the compensation technology is combined, it is necessary to change the structure of the original passive compensation system.
Description
technical field [0001] The present application relates to the technical field of power systems, and in particular to a method and device for obtaining active compensation current. Background technique [0002] The distribution network ground current full compensation technology has mature engineering application experience abroad. In recent years, some areas in China have also carried out pilot applications of active full compensation technology. In the current pre-adjusted arc suppressing coil, after single-phase grounding occurs, the damping resistance connected in series with the arc suppressing coil will be short-circuited, that is, the impedance of the arc suppressing coil compensation circuit is different when the system is in normal operation and single-phase grounding, so When the foreign active full compensation technology is applied, it is required to withdraw the damping resistance of the arc suppression coil so that the active full compensation device can calcula...
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IPC IPC(8): H02H9/00
CPCH02H9/007
Inventor 刘红文王科柴晨超
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST