Active power steady-state security regions (APSSRs), which can provide guidance for\nprevention and control through security checks, is of great importance for the safe operation of power\nsystems in which more and more sustainable energy power generation is integrated. As a mature\nflexible AC transmission system (FACTS) device, thyristor-controlled series compensators (TCSCs)\ncan carry out series compensation for the transmission line by controlling its equivalent reactance.\nWith the change of the equivalent reactance parameter of a TCSC, the nodal admittance matrix\nand power flow distribution of the power system also changes. Inevitably, the APSSR will be\ndifferent. Therefore, it is necessary and important to further incorporate the equivalent reactance\nparameters of TCSCs in the APSSR expression, which is generally established in the space of node\nactive power injections. In this paper, a rapid construction method of APSSRs incorporating the\nequivalent reactances of TCSCs is proposed. Firstly, applicability and efficiency of the conventional\nAPSSR construction method for power systems with TCSCs are analyzed. Further, with equivalent\ndisconnection of TCSC branches, the effect of TCSC equivalent reactances on the distribution of active\npower flow through changing the structure parameters is treated as modifying node active power\ninjections. On this basis, explicit expressions of APSSRs with a single TCSC equivalent reactance\nparameter and double TCSC equivalent reactance parameters are derived, respectively. Moreover,\nby deducing the general formula of APSSRs with multiple TCSC equivalent reactance parameters,\nthe feasibility of the proposed method for power systems with multiple TCSCs is analyzed. Eventually,\nvia benchmarks with different scales and a different number of TCSCs, validity and superiorities of\nthe proposed method in computational efficiency are demonstrated.
Loading....