Application of Flexible Control Devices in Typical Scenarios of the Hebei South Network

With the integration of large-scale new energy into the grid, flexible control equipment is crucial to the quality, safety and stability of grid power supply. This paper firstly introduces the mathematical models of flexible power transformer and United power flow controller (UPFC), and based on the unique background and existing problems of Hebei South Grid, we study the impact of two flexible control devices on the current distribution of Hebei South Grid based on PSD-BPA simulation. The simulation results show that selecting the transformer tap voltage based on the current delivery capacity can effectively solve the problem of heavy and overloaded main transformer of 1000 kV Xiong’an station. At the same time, installing UPFC equipment on the most serious overload lines can improve the heavy and overload situation of 500 kV Langfang area lines. It is concluded that the flexible control equipment can solve the problem of uneven current distribution, exceeding the limit and not meeting the N−1 calibration, and support the safe and stable operation of the power system.