Abstract
An online line switching methodology to relieve voltage violations is proposed. This novel online methodology is based on a three-stage strategy, including screening, ranking, and detailed analysis and assessment stages for high speed (online application) and accuracy. The proposed online methodology performs the tasks of rapidly identifying effective candidate lines, ranking the effective candidates, performing detailed analysis of the top ranked candidates, and supplying a set of solutions for the power system. The post-switching power systems, after executing the proposed line switching action, meet the operational and engineering constraints. The results provided by the exact Alternating Current (AC) power flow are used as a benchmark to compare the speed and accuracy of the proposed three-stage methodology. One feature of the methodology is that it can provide a set of high-quality switching solutions from which operators may choose a preferred solution. The effectiveness of the proposed online line switching methodology in providing single-line switching and multiple-line switching solutions to relieve voltage violations is evaluated on the IEEE 39-bus and 2746-bus power system. The CPU time of the proposed methodology compared with that under AC power flow constitutes a speed-up of 9905.32% on a 2746-bus power system, showing good potential for online application in a large-scale power system.
Highlights
It is widely known that the modern power grid is a large-scale and extremely complex interconnected network
The PQ decoupling method is used to compute the voltage of the violation bus with each effective candidate switched out, and the effectiveness of each candidate is ranked based on the calculated voltage variations of the post-switching power system
Qm = Qm,θ + QSmk + Qm,loss where buses μ is the set of buses connected to bus k excluding bus m and buses θ is the set of buses connected to bus m excluding bus k; Qk,μ and Qm,θ are the reactive power flows in lines connecting bus k and bus m to buses μ and buses θ, respectively; QSkm represents the reactive power flow of the transmission part; and Qk,loss, Qm,loss are the reactive power flows of the loss part
Summary
It is widely known that the modern power grid is a large-scale and extremely complex interconnected network. In order to further improve the speed and accuracy, a novel online line switching methodology is proposed in this paper to relieve voltage violations. The innovation of the proposed methodology in this paper is mainly reflected in the following aspects: It can find the “best” line switching scheme to relieve bus voltage violations for the power system. It can provide a variety of high-quality line switching schemes for multiple-line switching, from which the system operator can select a “desired” one. It shows fast speed, which means that it is suitable for determining switching lines of large-scale power systems in an online environment. The effectiveness of the proposed online switching methodology is evaluated on the IEEE 39-bus and 2746-bus power systems
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