RL model algorithm based fault ranging method of DC power distribution network

A DC distribution network and fault location technology, applied in the field of power systems, can solve problems such as fault current damage, obvious fault transients, and differences in fault characteristics of DC distribution networks, and achieve the effect of improving accuracy
CN110703045AInactive Publication Date: 2020-01-17STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH
Publication Date
2020-01-17
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention provides an RL model algorithm based fault ranging method of a DC power distribution network. The method comprises the steps: a line equivalent R-L model is established for a bipolar short-circuit fault condition without considering influence of the line distribution capacitance; according to an R-L model algorithm, a derivative of the current needs to be calculated by replacing a differential value at the midpoint moment with a differential value of two-point sampling values and replacing an instant value with a mean value; measurement is carried out in two moments to obtain twoindependent equations, and the two equations are resolved simultaneously to obtain unknown numbers R and L; and the R and L are compared with line parameters to obtain a fault distance, and a fault ranging function is realized. According to the method of the invention, the DC power distribution network is ranged accurately by double-end information measurement. The protection quickness and selectivity of the DC power distribution network can be met.
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Description

technical field

[0001] The invention belongs to the technical field of electric power systems, and in particular relates to a fault location method of a direct current distribution network based on an RL model algorithm. Background technique

[0002] With the development of voltage source converter (voltage source converter, VSC) technology, DC load and distributed generation, DC distribution network has attracted widespread attention at home and abroad. It has the advantages of flexible control, easy acceptance of distributed power sources such as photovoltaics and DC loads, large power supply capacity, and good power quality. At present, the research on DC distribution network at home and abroad mainly focuses on topology, voltage level, protection and control, and the research on its fault location is still in its infancy. Accurate fault location can avoid manual inspection of fault points, which is of great significance to quickly repairing lines and improving power sup...

Claims

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