Research on dynamic frequency bias coefficient and relevant evaluation criterion in the setting of UHV

After ultra-high voltage (UHV) tie lines are established, fluctuations of frequency and tie-line power become more obvious, which set a still higher demand on automatic generation control (AGC) performance. Frequency bias coefficient (K coefficient) plays the key role in improving control effect of AGC system. Based on operation characteristics of a domestic multi-area interconnected power system, this paper firstly proposes a calculation method of dynamic K coefficient in divided period. Furthermore, the evaluation criterion is first put forward to assess calculation results. Finally, an application example proves the validity of dynamic K coefficient in optimizing AGC operation.