Development of a Sequential Restoration Strategy Based on the Enhanced Dijkstra Algorithm for Korean Power Systems

Bokyung Goo,Solyoung Jung,Jin Hur

doi:10.3390/app6120435

Abstract

When a blackout occurs, it is important to reduce the time for power system restoration to minimize damage. For fast restoration, it is important to reduce taking time for the selection of generators, transmission lines and transformers. In addition, it is essential that a determination of a generator start-up sequence (GSS) be made to restore the power system. In this paper, we propose the optimal selection of black start units through the generator start-up sequence (GSS) to minimize the restoration time using generator characteristic data and the enhanced Dijkstra algorithm. For each restoration step, the sequence selected for the next start unit is recalculated to reflect the system conditions. The proposed method is verified by the empirical Korean power systems.

Highlights

We propose a sequential restoration strategy based on the enhanced Dijkstra algorithm for Korean power systems
It is essential to develop a restoration strategy for determining the generator start-up sequence (GSS) and the paths that can re-energize the generators according to the GSS
We propose a sequential and systematic restoration strategy that can minimize the generator restoration time and considers the characteristics of the Korean power system

Summary

Enhanced Dijkstra Algorithm

In order to minimize damage after blackouts occur, restoration should be fulfilled reliably and quickly. It is important to reduce the time taken for the selection of generators, and the time taken for the transmission lines and transformers should be considered. To restore the generators, the connectivity between two different buses should be verified using an adjacent matrix [25,29]. To find the restoration sequence of the rest of the generators, the information on the generators and the charging currents of the transmission lines are used. The rest of the 19 generators are non-black start uTnaibtsl.eIn1.thIneftoarbmlea, ttihoenreaibsoiunftotrhmeagteionneraabtoourst 2in[0] gtheeneeraasttoerrsn, sruecghioansst.he capability and ramping rate in MW/h, to calculate the start-up time for the units

G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12 G13 G14 G15 G16 G17 G18 G19 G20

G20 G7 G8 G9 G2 G1 G3 G11 G10 G14 G15 G16 G17 G12 G13 G4 G5 G18 G19

G20 G7 G8 G9 G1 G2 G3 G18 G19 G4 G5 G10 G11 G12 G13 G14 G15 G16 G17

Conclusions

20. PJM Manual 14B