Parallel filtering scheme for fast symmetrical component extraction based on asynchronous coordinate transformation

The common shortage of the existing methods for extracting symmetrical components from unbalanced and distorted three-phase voltages is that they introduce significant time delay before reaching an accurate result. Therefore, this paper presents a new filtering method to fast extract positive sequence component based on asynchronous coordinate transformation. Unlike conventional filter out harmonics in sequence, resulting cascading delay, proposed has two signal streams operating parallel, which particular refer negative extraction harmonic filtering, respectively, then can be easily derived by skillfully combining results streams. In theory, only suffers largest introduced these By carefully designing transformation, restricted, thus improving overall performance. Simulation experimental verified performance method.