Dynamic PV curve based power system stability assessment method and system

摘要

PURPOSE: An assessment method and system for system stability based on dynamic power-voltage curve are provided to prevent a wide area power outage since the system stability is dynamically evaluated by reflecting real-time monitoring data on a power-voltage curve based on off line determination. CONSTITUTION: A voltage and effective power of a transmitting end and a receiving end are obtained(ST110). A power-voltage curve is extracted using the obtained parameter(ST120). A safe driving limit of received power is obtained from the power-voltage curve(ST130). The voltage and active power of the receiving end are obtained in a current power system(ST140). System stability is determined by comparing the safe driving limit with the receiving end voltage of the current power system and the active power(ST150). [Reference numerals] (AA) Calculation per 5 minutes; (ST110) Receiving a voltage and effective power of a transmitting end and a receiving end from EMS/SCADA; (ST120) P-V curve extraction; (ST130) Maximum receiving end power calculation, Threshold = Maximum receiving end power * a margin; (ST140) PMU Date(Vr, Pr) receiving in real time(generation per 1/60 second); (ST160) System instability