Voltage Stability Assessment of Electrical Railway Network and Proposing the Way to Reduce the Risk of Voltage Instability

The ability of power system to maintain the acceptable range of voltage which is known as voltage stability, may be lost by increasing the real and reactive power consumptions. Voltage instability has been one of the major concerns in electrical railway system operation, since the demand for this transportation system has increased. By increasing the passenger demand, the operational plan should response and as the result the headway time should decrease. This results an increase in the power consumption of network as well as probability of voltage instability. This paper evaluates the risk of voltage instability by presenting the voltage stability index and considering the probabilities of system. To achieve this, the system is simulated by BBA Traction Simulator Program, which is designed and developed by Alucast Iran Co. R&D team. The 2*25 kv AC autotransformer electrical railway network of Sadeghieh to Hashtgerd, Tehran is utilized as a test system to validate the applicability and capability of presented method.