A novel out-of-Step detection algorithm using time variation of complex power

摘要

The present invention relates to a detection method using the synchronous step-out power per hour rate of change of the complex, the method comprising: measuring the voltage and current in the first phase an infinite bus system calculates the complex power (active power and reactive power); The method comprising expressing the calculated power to the locus of the complex form of the equation of the ellipse on the complex plane; And calculating a rate of change per hour of the calculated active power from the complex power (S)(P) and reactive power (Q); The calculated active power (P) and reactive power (Q) of the hourly rate for use with the stable case of power fluctuations in SEP (Stable Equilibrium Point) and unstable power fluctuations of UEP (Unstable Equilibrium Point) the division of steps and .; Evaluating a transient stability in a similar fashion area method, such as by using the trajectory of the complex power (S), it expressed in equation form of an ellipse; And a determination step of detecting the synchronous step-out detection point by whether the locus of the complex power (S) passed through the UEP; Generator mechanical input (P_m) which is a reference of the transient stability assessment and estimated from using a low-pass filter the active power (P), the generator a mechanical input (P_m) UEP point of the meeting point and the trajectory of the complex power and characterized in that for detecting the step-out in synchronization, it can accurately cope with the fluctuation of the system by quickly and accurately detecting a synchronization point of step-out, and to prevent erroneous operation and the sub operation of the relay expect a stable and reliable system operation that. ; Active power, reactive power, hourly rate, track movement, Generators mechanical input, synchronous step-out, Transient Stability