02-05-2017, 09:21 PM
03-05-2017, 12:41 PM
Voltage stability in the power system is defined as the ability of a power system to maintain acceptable voltages throughout the bus in the system under normal conditions and after being subjected to a disturbance. In the normal operating state, the voltage of a power system is stable, but when the fault or disturbance occurs in the system, the voltage becomes unstable, resulting in a progressive and uncontrollable decrease in voltage. Voltage stability is sometimes also called charge stability.
Due to voltage instability, a power system may suffer a voltage collapse if the equilibrium voltage after the disturbance near the loads is below acceptable limits. Voltage collapse is also defined as a process whereby voltage instability provides advantages of a very low voltage profile in the essential part of the system. The collapse of the voltage can be a total or partial blackout. The terms voltage instability and voltage collapse are often used interchangeably.
Voltage stability of the electrical system is characterized by being able to maintain load voltage magnitudes within the specified operating limits under steady state conditions. In this paper, the first order delay model of a charge admittance change is introduced. Then, using this model, we derive a set of linearized dynamic equations and obtain the stability conditions. An earlier result in the literature is shown in agreement with that in this paper. The stability conditions are tested and verified in a 2-load power supply system and a power supply system of 13 nodes and 4 sources.
Due to voltage instability, a power system may suffer a voltage collapse if the equilibrium voltage after the disturbance near the loads is below acceptable limits. Voltage collapse is also defined as a process whereby voltage instability provides advantages of a very low voltage profile in the essential part of the system. The collapse of the voltage can be a total or partial blackout. The terms voltage instability and voltage collapse are often used interchangeably.
Voltage stability of the electrical system is characterized by being able to maintain load voltage magnitudes within the specified operating limits under steady state conditions. In this paper, the first order delay model of a charge admittance change is introduced. Then, using this model, we derive a set of linearized dynamic equations and obtain the stability conditions. An earlier result in the literature is shown in agreement with that in this paper. The stability conditions are tested and verified in a 2-load power supply system and a power supply system of 13 nodes and 4 sources.