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

Inactive Publication Date: 2020-01-17
STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH
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Problems solved by technology

A large number of power electronic devices in the DC distribution network are vulnerable to fault current damage, and DC distribution network faults should be isolated within tens of milliseconds, so the online fault location method can only use the fault information of tens of milliseconds
Second, there are differences in the fault characteristics of the DC distribution network...

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

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Embodiment Construction

[0036] The specific implementation of a DC distribution network fault location method based on the RL model algorithm of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] figure 1 It is a schematic diagram of a typical DC distribution network circuit topology, in which the DC rated voltage is ±10kV, and the grid topology is handle-shaped. Considering the low voltage level of the distribution network, a DC circuit breaker is used to divide the fault current; the converter adopts a two-level VSC . A current-limiting reactor is installed in series at the outlet of the converter, and the neutral point of the DC side is grounded through a high resistance.

[0038] figure 2 It is a schematic diagram of a non-metallic bipolar short-circuit fault. At this time, the calculation of the instantaneous value of the local voltage contains the information of the opposite side, and the unknowns R and L cannot be obtained only by...

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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.

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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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 傅靖林林李伟伦金震袁松朱晓华黄梅潘静娟张波
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH
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