抄録
This paper proposes a novel PLL and a novel frequency detecting method suited for the abnormal voltage conditions due to faults in the power system. Conventional PLL and local frequency detecting method have operation missing and dynamic error under fault conditions. On the other hand, in the power system stabilization using power electronics equipment, clever detecting method for very small frequency difference is required at local point. But, some problems exist similarly to the above mentioned problems.
In this paper, from the point of view of positive sequence component governing the power system even under the fault conditions, the PLL and the frequency detecting method responding to the positive sequence component are proposed and discussed. And then, usefulness of this method is shown by simulating its operations including power system stabilization using voltage source type power converter.
As conclusion, we can see remarkable robustness of this method. And, dynamic error and twice frequency pulsation are remarkably reduced.
Therefore, this method is expected to be applicable to power system control.
