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Sensitivity Model to Power Flow Control Capability Using Controllable Series Compensators

The series compensator, such as the thyristor controlled types, is often applied to high-voltage transmission to control power flow distribution and avoid overload/overvoltage. Various power flow schemes are needed to quantify its control capability which is related to network topology and load level. Sensitivities of bus voltages and power flows to the controlled line reactance, current magnitude, and active power flow, are given to quantify the control effect of the controllable series compensation under different operation conditions. Feasible setting to the controlled parameters within the adjustable range of the series reactance is estimated. The proposed model is applied to the ultra high-voltage (UHV) transmission, whose line parameters are lumped from the distributed line model. The numerical results on WSCC 9-bus system are proposed to validate control effect and error of the proposed model.