Abstract
In order to study the influence of distributed power access on the security state of distribution network, a comprehensive evaluation method for the security state of distribution network including distributed power access was proposed.Based on the output model and load model of photovoltaic power supply, the security situation assessment index system of distributed power supply access distribution network is established. Then combined with fuzzy analytic hierarchy process and entropy weight method, the composite weight of each index is obtained, and the combined weight is optimized based on chi-square distance. Finally, the evaluation method based on ER algorithm (Evidential Reasoning) is proposed. Simulation results verify the effectiveness and accuracy of the proposed method.
Highlights
After more and more distributed power supply (DG) is connected to the distribution network, it will have an impact on the operation state of the distribution network, and security is an important aspect of it
It is necessary to effectively evaluate and analyze it, which is conducive to the promotion and development of distributed power supply [1,2]. Key indexes such as voltage change rate and average voltage fluctuation are analyzed in literature [3,4], as well as the influence degree of different distributed power grid connection on voltage. [5,6,7,8] for distributed power distribution network access, the size of the trend and direction, the great changes will make the distribution network voltage changes, the grid security divided into different levels, from risk index, the static safety index such as index evaluation column grid solution, the more voltage limit, voltage security situation, but the assessment method are clear enough
Literature [8] adopts the subjective and objective weighting method to conduct a comprehensive assessment of power quality, but it is only applied to the comprehensive assessment of power quality and cannot withdraw the security of distribution network
Summary
After more and more distributed power supply (DG) is connected to the distribution network, it will have an impact on the operation state of the distribution network, and security is an important aspect of it. It is necessary to effectively evaluate and analyze it, which is conducive to the promotion and development of distributed power supply [1,2] Key indexes such as voltage change rate and average voltage fluctuation are analyzed in literature [3,4], as well as the influence degree of different distributed power grid connection on voltage. Security is reflected in the power supply capacity and power supply quality of the power system, which must be considered in the actual operation of the power system. It can be judged by the data of the power system under specific conditions
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