Simulation method and device for decoupling of short circuit in active power distribution network

A distribution network and line technology, applied in the direction of electrical digital data processing, instruments, calculations, etc., can solve the problems of divergence of results, reduction of simulation accuracy, etc., and achieve the effect of overcoming inapplicability and the increase of traveling wave transmission time

Pending Publication Date: 2021-10-29
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The split-core parallel simulation method of the distribution network is to decouple the originally coupled systems. The calculation results of each calculation core need to be exchanged and transmitted according to the uniform calculation step size, so as to ensure the convergence of the simulation results, and the power line carrier is generally used in the distribution network. The communication method, so the medium for exchanging and transmitting calculation result information is the transmission line. In order to ensure that each calculation core can be given sufficient calculation completion time, the line length should not be too short, and there will be a certain line length requirement. In the distribution network, the transmission line is generally short, generally 6-20km. If the calculation step size Δt of each calculation core is too short, it may occur that the calculation result of the previous calculation core will be in the next calculation due to the short transmission line. The exchange and transfer of information begins before the core calculation results are obtained, which may lead to serious consequences of reduced simulation accuracy or even divergent results

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  • Simulation method and device for decoupling of short circuit in active power distribution network
  • Simulation method and device for decoupling of short circuit in active power distribution network
  • Simulation method and device for decoupling of short circuit in active power distribution network

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Embodiment 1

[0055] The present invention provides a simulation method for the decoupling of short lines in an active distribution network, such as figure 2 shown, including:

[0056] Step 1: Calculate the increased distributed capacitance value in the active distribution network according to the delay step between adjacent computing cores in the parallel simulation of the active distribution network split core, and the increased distributed capacitance value is connected in parallel to the short line both ends;

[0057] Step 2: Carry out simulation calculation on the circuit between the two ends of the short line with increased distributed capacitance value, and exchange electrical quantity data between the two ends of the simulated short line to realize the decoupling of the short line in the active distribution network and carry out Parallel simulation.

[0058] In view of the fact that the length of the line in the distribution network does not meet the requirements of the informati...

Embodiment 2

[0095] The present invention provides an optimal embodiment of a simulation method for decoupling of short lines in an active distribution network, such as Figure 5 In the shown IEEE33 node system, a single distributed photovoltaic is connected to node 9, and the distribution network is divided between node 8 and node 9. Since node 8 is connected to node 9, the line between them is relatively short , so the characteristic line short line decoupling method is adopted.

[0096] The IEEE33 node system is decoupled from nodes 8 and 9, divided into two parts, and put into 1#CPU and 2#CPU for split-core parallel simulation, and the transient event is set to three-phase at node 17 In the event of a short-circuit fault, the output power of distributed photovoltaics will inevitably change accordingly. At the same time, a serial simulation control group is established, that is, the entire IEEE33 node system is placed in the same computing core for serial simulation.

[0097] In this ...

Embodiment 3

[0103] Based on the same inventive concept, the present invention also provides a simulation device for decoupling of short lines in active distribution network, such as Figure 10 shown, including:

[0104] The calculation module is used to calculate the distributed capacitance value added in parallel with the short line in the active distribution network according to the delay step size between adjacent calculation cores in the active distribution network sub-core parallel simulation;

[0105] The decoupling module is used to use the calculation cores to perform simulation calculations at both ends of the short lines with increased distributed capacitance values, and to exchange electrical quantity data between the calculation cores at both ends, so as to realize the decoupling and integration of short lines in the active distribution network. Perform parallel simulations.

[0106] The formula for calculating the increased distributed capacitance value is as follows:

[01...

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Abstract

The invention relates to a simulation method and device for decoupling a short circuit in an active power distribution network. The method comprises the following steps: calculating an increased distributed capacitance value in the active power distribution network according to a delay step length between adjacent calculation cores in active power distribution network sub-core parallel simulation, wherein the increased distributed capacitance value is connected to two ends of a short circuit in parallel; carrying out simulation calculation on a circuit between the two ends of the short circuit added with the distributed capacitance value, and carrying out electric quantity data exchange between the two ends of the simulated short circuit, so that decoupling of the short circuit in the active power distribution network is realized, and performing parallel simulation. Therefore, the inapplicability of the too short power transmission line of the power distribution network in parallel simulation of the power distribution network is overcome to a certain extent.

Description

technical field [0001] The invention relates to the field of parallel simulation of active distribution network decoupling, in particular to a simulation method and device for decoupling of short lines in an active distribution network. Background technique [0002] Due to the addition of large-scale distributed power in the active distribution network, the network structure becomes very complex and huge. The power electronic device model of the distributed power greatly limits the simulation speed of the large-scale active distribution network. In order to improve the simulation speed, it is necessary to partition and decouple the active distribution network, put different regions into separate computing cores, and perform simulation calculations at the same time, so as to realize split-core parallel simulation. At the level of decoupling methods, power transmission The Bergeron transformation of the line model realizes network decoupling. The result of the transformation i...

Claims

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Application Information

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IPC IPC(8): G06F30/367G06F113/04
CPCG06F30/367G06F2113/04
Inventor 杜晓东詹惠瑜曾四鸣赵建利姬艳鹏冯海燕王春璞郭禹伶
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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