Power system available transfer capability (ATC) defines the power exchange ability among different areas. The ATC information is crucial to power system market players. However

with the dramatic growth of natural gas fired power plant (NGFPP) proportion

the adequacy of primary energy and the natural gas system operational limits have not been well considered in the conventional ATC calculation

which is obviously inappropriate. In response

power system ATC calculation considering electricity and natural gas coupled energy system steady-state security constraints is primitively studied. Meanwhile

the concept of steady-state security regions of electricity and natural gas coupled energy systems is presented. Furthermore

continuation power flow based on the linear prediction method is implemented. The linear prediction method is used to identify the critical constraint

which benefits both the fast and accurate ATC calculation

and the adjustment of natural gas system operating states. Finally

applicability of the proposed method is verified by test results. This work is supported by National Natural Science Foundation of China (No. 51277052

No. 51107032

No. 51407125).