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The Exchange Algorithm and Its Application for Determining the Optimal Position of Switching Devices

Author: WangJingTao
Tutor: XieKaiGui
School: Chongqing University
Course: Electrical Engineering
Keywords: Distribution network Reliability Assessment Position replacement Optimal Switching Parameter changes
CLC: TM732
Type: Master's thesis
Year: 2008
Downloads: 59
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Abstract

This article optimal distribution network switch models and algorithms (No.50307015) \Paper-based distribution network reliability switching position displacement method and the improved algorithm, reliability and economic impact of the switch optimized configuration analysis study. According to statistics at home and abroad, about 80% of the power outage due to the failure of the power distribution system, under the conditions of economic constraints to improve the level of reliability of the distribution network has become a hot research. The switch provides an effective way to improve the distribution network reliability optimal allocation. Optimized distribution network switch configuration, can increase the level of network reliability, reduce outage cost, and improve the economic efficiency of distribution network. Papers in the principle of cost - benefit analysis and distribution network reliability theory based distribution network switch replacement algorithm for optimal allocation position. The main content of the paper are as follows: ① given distribution network switch optimization models and algorithms configure the location of the replacement method. The model is based on the annual value, taking into account the Interruption Cost, switching equipment investment, operation and maintenance costs, the total cost of a minimum of the objective function, and taking into account the trend, reliability, and cost constraints. Optimize the allocation of the distribution network use location replacement switch time replacement of a switch position, the rest of the switch position remains unchanged, and that in turn each switch is moved from the initial position to the surrounding location, each switch position replacement network reliability assessment, calculation of the objective function, and ultimately the optimal placement of switch. Switch to optimize the allocation of reliability assessment algorithm uses a block algorithm, that instead of block units-element fault enumeration. The consequences of failure mode analysis method known each switch replacement only change very few blocks of the structure of the network, therefore, only need to change the block re fault enumeration calculated to fast network reliability indicators and blackout loss goals function values, in order to improve the efficiency of the algorithm. By contrast RBTS-BUS6 switch and other systems to optimize the allocation and genetic algorithm analysis to verify the correctness and feasibility of the algorithm. The ② proposed combination of improved switch position replacement with genetic algorithm to optimize the allocation algorithm. The position replacement algorithm global optimality and convergence rate has a strong dependence on the initial value, and how to determine the initial value is particularly important. To further optimize the algorithm, the position permutation algorithm and genetic algorithm combined with the use of a genetic algorithm solution as the initial solution of position replacement algorithm, instead of based on engineering experience uniform stepwise method. The algorithm takes advantage of local convergence characteristics of the location of the replacement method and genetic algorithm global convergence characteristics, in order to get more genetic algorithm better solution even global optimal solution. Pressure in the algorithm is applied to a 10kV distribution network optimization based on the use of genetic algorithms to configure the switch, the premise does not change the number of switches, can reduce the loss of network outage costs. The examples show that when more switch configuration for a long time its optimization effect is more obvious. The ③ analysis of the optimal allocation of reliability parameters and economic changes in the parameters of the switch. Optimal Configuration of Switching mathematical model can be seen, the switch configuration is determined by the component and system reliability and economic parameters. Currently, many studies are based network planning to determine the parameters to configure the switch mode, but with the social and economic development, reliability or economic parameters may change, thereby affecting the switch configuration results, therefore, the need to carry out parameter changes switch to optimize the allocation of impact analysis. Paper as an example to the network of 10kV actual engineering, respectively, from the two aspects of reliability and economic analysis of the impact of parameter changes on the network switch configuration. Power system planning is taking into account the parameters change, especially switching optimal allocation, to provide some reference value. ④ Distribution System Reliability Assessment switch location replacement block method to optimize the configuration program written in VC 6.0. Has been applied to practical engineering example system inspection program works applicability.

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