Power Transmission Network Expansion Planning Research Considering System Weak Connection Recognition

Splitting is the last line of defense to protect the power system. In the initial stage of transmission grid planning, reducing weakly connected lines can reduce the search candidate of active splitting and increase the effectiveness of active splitting. Firstly, a bi-level transmission network programming model is proposed in this paper. In this bi-level model, the upper-level model takes the minimum number of weakly connected lines in the system as the optimization objective. And in the lower layer model, the objective is to minimize the sum of the construction cost of the new lines and the system operation cost. Then the improved double-layer particle swarm optimization algorithm is used to solve the bi-level model. Finally, the results of the IEEE Graver 6-bus test system show that the model and algorithm are effective.