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Optimal configuration method for fault current limiter in flexible direct-current power grid

A technology of fault current limiter and flexible DC, which is applied in the direction of emergency protection circuit devices, circuit devices, AC network circuits, etc. for limiting overcurrent/overvoltage, and can solve the problems of difficult manufacture and cost increase of large-capacity circuit breakers

Active Publication Date: 2021-01-15
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A very important factor that determines the cost of a DC circuit breaker is the capacity of the circuit breaker. It is not easy to manufacture a large-capacity circuit breaker, and the corresponding cost increases significantly with the increase in capacity.

Method used

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  • Optimal configuration method for fault current limiter in flexible direct-current power grid
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  • Optimal configuration method for fault current limiter in flexible direct-current power grid

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specific Embodiment 1

[0056] according to figure 1 As shown, the present invention provides an optimal configuration method of a fault current limiter in a flexible DC power grid, specifically:

[0057] A method for optimal configuration of a fault current limiter in a flexible DC power grid, comprising the following steps:

[0058] Step 1: Build a power flow calculation model, input the node voltage capacitance and branch inductance resistance into the power flow calculation model, and obtain the steady-state information of the power grid during steady-state operation. The steady-state information includes the steady-state voltage of each node and each branch The steady state current of the circuit;

[0059] The step 1 is specifically:

[0060] Determine the power balance equation of each node in the flexible DC network, and express the power balance equation P of each node in the flexible DC network by the following formula dci :

[0061]

[0062] Among them, P dc is the node power, U dc...

specific Embodiment 2

[0105] The optimal configuration process of the fault current limiter in the three-terminal loop flexible direct current transmission network.

[0106] Firstly, the power flow model is used to calculate the power flow of the three-terminal ring network, and compared with the results of the simulation model, the accuracy of the power flow model is verified. The results are shown in Table 1:

[0107] Table 1 Comparison of calculation results of DC grid power flow

[0108]

[0109] Then input the grid steady-state data into the numerical model of the fault current, output the fault current image 4ms after the fault, compare the numerical calculation model of the fault current with the results obtained by the simulation model, and compare the numerical calculation model of the fault current Verification of accuracy. The result is as figure 2 Shown:

[0110] Using the obtained steady-state data and the limit conditions set by the fault current model, the optimal configurati...

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Abstract

The invention relates to an optimal configuration method for a fault current limiter in a flexible direct-current power grid. The invention relates to the technical field of optimal configuration of fault current limiters. The method comprises steps of building a load flow calculation model, building a fault current model, and enabling the fault current model to carry out the numerical iterative calculation, thereby obtaining a fault current; generating a constraint condition according to each branch of the power grid network; determining a particle dimension, setting a variable range in the particle, generating an initial particle population, and determining a target function; inputting the initial particle population into a target function to obtain a globally optimal solution and an individual optimal solution, performing particle updating, and storing the globally optimal solution into an external file according to an updating rule to obtain a configuration result; and scheme selection being carried out according to the cost proportionality coefficient. According to the method, constraint conditions are set, and multi-objective optimization is carried out by using a particle swarm algorithm around the two purposes of minimum total inductance value of the configured current limiter and minimum total capacity of the circuit breaker, so the minimum total cost of the configuration process is realized.

Description

technical field [0001] The invention relates to the technical field of optimal configuration of a fault current limiter, and relates to an optimal configuration method of a fault current limiter in a flexible direct current grid. Background technique [0002] Due to the rapid development of fault current in the DC network, it is necessary to limit the development of fault current in order to better protect the network after the fault. The current existing method is to effectively limit the rising speed of the fault current by connecting a fault current limiter in the DC grid, so as to ensure that the low-capacity circuit breaker can realize the stable breaking of the fault current. Installing an inductive fault current limiter will affect the transient characteristics of the system. Increasing the branch inductance is equivalent to adding an integral link to the system, which will reduce the transient response speed of the system. The biggest advantage of installing a fault...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/06H02H9/02H02H7/26
CPCH02J3/36H02J3/06H02H9/02H02H7/268H02J2203/20H02J2203/10Y02E60/60
Inventor 王盼宝魏伟孙红梅王卫徐殿国杨景刚史明明肖小龙苏伟
Owner HARBIN INST OF TECH