Three-phase imbalance and single-phase earth fault integrated suppression method for power distribution network
A single-phase ground fault and distribution network technology, which is applied to the fault location, detects faults according to conductor types, and measures electricity, etc., can solve problems such as single-phase ground faults, and achieve the effect of integrated suppression
Active Publication Date: 2021-06-08
FUZHOU UNIV
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[0049] As shown in the figure, a distribution network three-phase unbalance and single-phase ground fault integrated suppression method includes the following steps:
[0050] Step S1: Take the flexible arc suppression device as the hardware platform, connect it to the neutral point of the distribution network, and control the injection current to realize the three-phase unbalance suppression of the distribution network;
[0051] Step S2: In view of the occurrence of single-phase ground fault in the process of three-phase unbalance suppression, use whether the neutral point voltage amplitude of the distribution network is greater than the set value as the fault criterion to identify the single-phase ground fault in the process of three-phase unbalance suppression ;
[0052] Step S3: After the single-phase ground fault occurs, the flexible arc suppression device changes the injection current to jointly suppress the three-phase unbalance and fault current; when using the current ...
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The invention provides a three-phase imbalance and single-phase earth fault integrated suppression method for a power distribution network, which comprises the following steps: S1, taking a flexible arc extinguishing device as a hardware platform, connecting the flexible arc extinguishing device to a neutral point of a power distribution network, and controlling injection current to realize three-phase imbalance suppression of the power distribution network; S2, for a single-phase earth fault occurring in the three-phase imbalance suppression process, identifying the single-phase earth fault in the three-phase imbalance suppression process by using whether the neutral point voltage amplitude of the power distribution network is greater than a setting value or not as a fault criterion; S3, after the single-phase earth fault occurs, enabling the flexible arc extinguishing device to change the injection current to jointly suppress three-phase imbalance and fault current; when the current arc extinction method is used, the influence of three-phase grounding parameter imbalance is considered, and an injection current expression is comprehensively calculated, so that the optimization of the current arc extinction effect is realized while the three-phase imbalance is suppressed; and according to the invention, the problems of neutral point displacement voltage and single-phase grounding faults of the resonant grounding system can be solved.
Description
technical field [0001] The invention relates to the technical field of power lines, in particular to an integrated suppression method for three-phase unbalance and single-phase grounding faults in a distribution network. Background technique [0002] Single-phase ground fault is the most common fault in the distribution network, often accompanied by arcing. To prevent the fault from expanding, it is necessary to extinguish the arc at the fault point in time. The resonant grounding system uses the arc suppression coil to compensate the capacitive current of the distribution network to the ground to realize the fault arc suppression. However, under the unbalanced condition of the three-phase-to-ground parameters, the zero-sequence impedance of the arc-suppression coil is small, which can easily lead to neutral point displacement overvoltage and affect the normal operation of the distribution network. In order to solve this problem, arc suppression coils are generally used in ...
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IPC IPC(8): G01R31/52G01R19/165G01R31/08
CPCG01R31/52G01R19/16576G01R31/086G01R31/088
Inventor 郭谋发陈木炎高伟洪翠林舒玥杨耿杰
Owner FUZHOU UNIV