Optimal Expansion Planning of AC/DC Hybrid System Integrated with VSC Control Strategy

The studies of the conventional optimal planning of AC/DC hybrid power system are barely concentrated on the VSC control strategies which can be very meaningful for system expansion. A load flow calculation of hybrid system integrated with VSC control strategy is proposed in this paper. Then based on the flow calculation, an optimal expansion planning with the key objective of economic efficiency is designed. The model of power flow for AC/DC power system is calculated by alternative algorithm and the objective function of the expansion planning is according to the cost minimization with the constraints of the costs for generation and the transmission lines. Solved by the calculation model and planning model, an example is presented in the final part of this paper to illustrate the influence of the control strategy of VSC on the power flow calculation as well as the optimal planning and indicate the value of the consideration of the converter control strategy in the optimal planning.