Abstract: A method of controlling an output of a generation plant (2) that is connected to a bulk electrical power network (4) by an electrical route (6). The method comprises determining (31) a phase angle difference between a first phase angle representing a phase angle of a voltage waveform at an output of the generation plant (2) and a second phase angle representing a phase angle of a voltage waveform at a location within the bulk electrical power network (4). The phase angle difference is compared (32) to a threshold phase angle difference that represents a constraint on the electrical route (6). The output of the generation plant (2) is controlled (33, 34) based on the comparison to prevent overloading of the electrical route (6).

Abstract: A method of controlling an output of a generation plant (2) that is connected to a bulk electrical power network (4) by an electrical route (6). The method comprises determining (31) a phase angle difference between a first phase angle representing a phase angle of a voltage waveform at an output of the generation plant (2) and a second phase angle representing a phase angle of a voltage waveform at a location within the bulk electrical power network (4). The phase angle difference is compared (32) to a threshold phase angle difference that represents a constraint on the electrical route (6). The output of the generation plant (2) is controlled (33, 34) based on the comparison to prevent overloading of the electrical route (6).

Abstract: A method of monitoring a high voltage electrical power system is described in which a system acquires measurements the small perturbations in power system parameters, from which are derived the system dynamic characteristics used to determine power transfer limits that take account of power system prevailing conditions. Further, a method is described that can be used to identify the probable source of power system oscillations that can limit secure power transfer.

Abstract: There is described a method of monitoring high voltage electrical power system. The method involves measuring small signal power system characteristics under prevailing systems conditions and determining the power transfer limits using said measurements.