Distribution network system fault suppression method and device, computer storage medium and equipment
A distribution network system and fault technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as distribution network system insecurity, and achieve elimination Single-phase ground fault, realize overvoltage, and ensure the effect of system safety
Active Publication Date: 2019-02-15
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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[0004] Based on this, it is necessary to provide a distribution network system fault suppression method and device, computer storage medium and equipment for the problem of distribution network system insecurity
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[0031] Such as figure 1 , figure 2 as well as image 3 As shown, a distribution network system (that is, a distribution network arc-suppression coil grounding system) is provided, including a main transformer, a bus bar, a grounding transformer, and an arc-suppression coil. The arc-suppression coil includes a primary coil and a secondary coil corresponding to the primary coil. The secondary side coil, the secondary side coil includes the first coil and the second coil; the main transformer is connected between the main AC grid (for providing AC power) and the busbar, the busbar is connected to one side of the grounding transformer, and the other side of the grounding transformer The primary side coil of the arc suppressing coil is grounded, the first coil is connected in series with the signal generator, the second coil is connected in series with the silicon controlled rectifier, the busbar is also connected to the load through each feeder line, and each feeder line is grou...
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The invention relates to a fault suppression method and device of a power distribution network system, a computer storage medium and equipment. The fault suppression method comprises the steps of acquiring total ground capacitance according to a frequency of a current signal which is correspondingly generated when phase difference between a voltage and a current of a first coil of a signal generator is zero and initial inductance of an arc elimination coil; detecting a fault of the system according to a zero-sequence voltage so that a single-phase grounding fault of the system can be accurately detected; acquiring a target inductance value of a first arc elimination coil according to the total ground capacitance and rated frequency of a main AC power grid when the single-phase grounding fault is detected; and adjusting a conduction angle of a silicon controlled rectifier to a first target conduction angle. Therefore, the single-phase grounding fault can be accurately detected, a current passing through a secondary-side coil is changed after the conduction angle of the silicon controlled rectifier is adjusted, a current of a primary-side coil is further changed, the voltage of the ground capacitance is changed, overvoltage suppression of the fault is achieved, and the safety of the system is ensured.
Description
technical field [0001] The invention relates to the field of power system control, in particular to a distribution network system failure suppression method and device, computer storage medium and equipment. Background technique [0002] With the continuous increase of power grid capacity and the extensive use of cables in the distribution network, the capacitive current of the power system increases sharply, and the occurrence of single-phase ground faults will seriously affect the stable operation of the distribution network system, and the overvoltage of It will often expand the accident, greatly reduce the reliability and safety of the power system operation, and pose a hidden danger to the safe operation of the power grid. [0003] In the urban distribution network, the distribution network system usually adopts the grounding method of the neutral point through the arc suppression coil. At present, in order to improve the safety of the power system, some fault processin...
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IPC IPC(8): H02H9/08
CPCH02H9/08
Inventor 白浩田兵史训涛简淦杨练依情
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD