Abstract: Avoltage disturbance detection method based on mathematical morphological filtering and derivation

dq transformation was proposed. Firstly，in order to reduce the interference of pulses，harmonics and other noises in the signals to be detected，a composite morphological filter was constructed based on adaptive theory to preprocess the noisy signals to be detected. Then the voltage disturbance of the preprocessed voltage signal was detected by the improved derivation dq transformation of multiple linear morphological filter，so that the amplitude and phase of the voltage to be measured can be detected quickly and accurately. The simulation model was built，the filtering flow of adaptive composite morphological filter，the performance of adaptive composite morphological filter，and the voltage disturbance detection performance of derivation dq transformation method improved by multiple linear morphological filter were analyzed. Finally，a voltage disturbance generation hardware platform was built to verify the voltage detection capability of the proposed method in the case of disturbance.

      Key words: derivation dq transformation ；adaptive composite morphological filter ；voltage disturbance

detection ；amplitude and phase