Power distribution network single-phase earth fault flexible arc extinguishing method
A ground fault and distribution network technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as poor arc suppression effect, and achieve good arc suppression effect, simple operation, and high accuracy.
Active Publication Date: 2021-01-22
XI'AN POLYTECHNIC UNIVERSITY
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Problems solved by technology
[0008] The purpose of the present invention is to provide a flexible arc suppression method for one-way grounding fault in distribution network, which solves the problem of poor arc suppression effect existing in the prior art
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[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] The present invention is a flexible arc suppression method for one-way grounding fault in distribution network, the process of which is as follows figure 1 As shown, the specific steps are as follows:
[0032] Step 1, when the distribution network is running normally, such as figure 2 As shown, the flexible inverter device is grounded to the distribution network, and the flexible inverter device is used to inject two power frequency currents with different amplitudes and the same phase into the neutral point Get the corresponding two neutral point voltages And calculate the parameters of distribution network to ground;
[0033] According to Kirchhoff's law:
[0034]
[0035]
[0036] are the three-phase power potentials of the distribution network, C A 、C B 、C C are three phase-to-ground capacitances, R A , R B , ...
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The invention discloses a flexible arc extinguishing method for a one-way grounding fault of a power distribution network. The method specifically comprises the following steps: 1, injecting two powerfrequency currents with different amplitudes and the same phase into a neutral point, obtaining a corresponding neutral point voltage and calculating a grounding parameter of the power distribution network; 2, judging whether a single-phase earth fault occurs or not: if not, returning to the step 1, and if yes, performing fault phase selection; 3, after phase selection succeeds, injecting two power frequency currents into the neutral point, obtaining corresponding neutral point voltage, and calculating the grounding resistance; 4, comparing the grounding resistance with the critical resistance: if the grounding resistance is greater than the critical resistance, selecting a voltage arc extinction method to generate inverter current, otherwise, selecting a current arc extinction method togenerate inverter current; 5, filtering the inverter current to obtain an instruction current, injecting the instruction current into the neutral point of the power distribution network, suppressing the fault phase voltage to be zero, and achieving the arc extinguishing purpose. According to the invention, the problem of poor arc extinguishing effect in the prior art is solved.
Description
technical field [0001] The invention belongs to the technical field of processing methods for single-phase ground faults in distribution networks, and relates to a flexible arc suppression method for single-phase ground faults in distribution networks. Background technique [0002] Single-phase ground faults account for more than 70% of my country's distribution network. In order to reduce the single-phase grounding fault current, the neutral point non-effective grounding system is generally adopted. When a single-phase ground fault occurs, it can compensate the ground capacitive current, reduce the fault current, and promote fault arc suppression. With the development of distribution network, the increase of cable lines and the flexibility of equipment, some problems in the development of traditional distribution network have been solved, but at the same time, the reactive component, active component and harmonic component in the grounding residual current have also increa...
Claims
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Login to View More IPC IPC(8): H02H9/08H02J3/00
CPCH02H9/08H02J3/001
Inventor 邵文权王猛程远徐嘉鹏
Owner XI'AN POLYTECHNIC UNIVERSITY