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Uneven voltage, strong magnetic field and current effect can easily disturb the optimization of distribution network flexibility, The flexibility improvement effect is not obvious. In order to solve problems above, a two-stage flexibility optimization method was proposed for distribution network. Firstly, the instantaneous power balance algorithm was used to ensure the distribution network to reach the three-phase equilibrium. Secondly, the reactive power planning of the distribution network was realized through the output characteristics of reactive power output and active power loss, which effectively improved the operation quality and reduces the network loss. Finally, the two-stage optimization method that integrated diversified electric sources and loads was adopted to improve the flexibility of distribution network. In the first stage, a flexibility optimization model was built based on three indicators of flexibility and the supply characteristics of diversified electric sources and loads. In the second stage, in consideration of probability balance of distribution network flexibility indicators, the model was solved by linear transformation algorithm to complete the flexibility optimization of distribution network. Test results show that the proposed method has the advantages of small loss rate, small fluctuation curve of net load, short calculation time and flexible adaptability of distributed power access in distribution network. It can be seen that the flexibility of distribution network with distributed power supply can be effectively improved and the ability of distribution network to accept distributed power supply can be improved through flexible optimal scheduling. [ABSTRACT FROM AUTHOR]

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Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)