Improved available transmission capability algorithm based on parameterized power flow model

In order to calculate the available transmission capability of large scale interconnected power grid,an improved algorithm based on the parameterized power flow model is proposed in the framework of repeated power flow algorithm,which adopts continuous power flow model to enhance the primal calculation process,improves the convergency and stability of power flow analysis by alternate iteration and considers the impact of power augment direction on the calculative results. The fault is parameterized during constraint check and the continuous power flow model is built to detect if the system is really instable when the power flow is unsolvable. The cross-section power is parameterized during multi-section power control process and the continuous power flow model is built to improve the control process. Case study is carried out for CEPRI 36-bus system and a practical large scale interconnected power grid,which shows the effectiveness of the proposed algorithm and its adaptability to system of poor power flow convergency.