A new fast static security analysis algorithm, based on the interval analysis theory and probability theory, is proposed to improve the efficiency and accuracy of security analysis during power network interaction. In...
详细信息
ISBN:
(纸本)9781509064090
A new fast static security analysis algorithm, based on the interval analysis theory and probability theory, is proposed to improve the efficiency and accuracy of security analysis during power network interaction. In this paper, the characteristics of network interaction and uncertainty in the interaction process are illustrated firstly. After that the dimension reduction technique is employed in DC interval load flow calculation to determine the branch power flow efficiently. Then active power related contingency screening index is proposed, based on the DC interval analysis and the probability theory, which facilitates the screening of serious contingencies during the interactive process and improves the accuracy of contingencyscreening. Finally, cumulated and Gram-Charlier series expansion based AC probabilistic power flow is carried out for different operating scenarios during interactive time process. JS 1018-bus example system is introduced to validate the proposed method. Compared with traditional static security analysis, the proposed method can provide more efficient and accurate results for real time system operation.
In restructured power system, determination of Available Transfer Capability (ATC) is an important issue. The ATC calculation is limited by system stability consideration. ATC calculated with dynamic stability limit i...
详细信息
ISBN:
(纸本)9781509047789
In restructured power system, determination of Available Transfer Capability (ATC) is an important issue. The ATC calculation is limited by system stability consideration. ATC calculated with dynamic stability limit is referred as Dynamic ATC (DATC). The Hopf bifurcation limit, associated with dynamic instability is considered in this paper as a limit for ATC calculation. In this paper, Differential Evolution Algorithm (DEA) is applied to obtain accurate Hopf bifurcation point for DATC calculation. Dynamic ATC is calculated for bilateral and multilateral transaction using the proposed approach. The static ATC is also calculated for finding the governing criteria for each transaction. In order to identify the severe lines for each transaction, stability based contingencyscreening is performed. Based on contingency screening index severe lines are ranked and for first five severe lines the DATC is calculated. The results are compared with a Step by Step algorithm. Simulation is done for three different load scenarios namely static, dynamic (Induction machine model) and ZIP load. The proposed approach is tested on New England 10 machine 39 bus system for various transactions using PSAT Tool. Test results show the accuracy of proposed approach.
暂无评论