Determining Feasible Region of Tie-line Transmission Considering Converter Station

Abstract

Power resources and demand in China are in opposite directions, leading to the requirements of tie-line power exchanges. A good characterization of the feasible region of tie-line transmission plays a vital role in improving the utilization efficiency of tie-line power exchanges. With the increase of converter stations in power systems, the feasible region of tie-line transmission considering converter stations is for the first time studied in this paper. A bi-level determination method is presented for the characterization. In the upper level, impacts of integer variables in converter stations are incorporated into the feasible region by exploring the critical combinations of integer variables that are associated with boundaries of the feasible region. In the lower level, the operational constraints with the found integer variables are projected to the domain of tie-line transmission by the existing algorithms. The effectiveness of the presented methods is demonstrated in a modified IEEE 5-bus test system.