Abstract
Network parameters in power systems are necessary to calculate bus voltages, currents, and powers. Therefore accuracy of network parameters is very important to get hold of the condition of power systems exactly. However generally, we regard them as constant. Thus accuracy of network parameters and calculated state values may be deteriorated. Recently, studies on Global Positioning System (GPS) for power system monitoring are being carried out in many fields. Because of high accuracy of GPS's time signals, we can calculate phase angles simultaneously from waveform of bus voltages or currents. By using this information, we can estimate more accurate network parameters and consequently state values.
In this paper, we propose a new method of on-line network parameter and state estimations using phase angles which can be calculated by GPS and power system information (bus voltages, power flows, line flows). By doing the estimation, improvement in accuracy of network parameters and all sorts of calculations in power systems is expected.
