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| Hybrid Wavelet-Energy Operator Method for Voltage Sag Detection |
| Lu Boyong1, Huang wenqing2 |
| 1. Hunan Mechanical & Electrical Polytechnic Changsha 410151 China 2. Hunan University Changsha 410082 China |
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Abstract This paper proposes a novel hybrid wavelet-energy operator method for accurate voltage sag detection and measurement. In the proposed method, the voltage sag is decomposed into two signal parts by wavelet transform: one is a detail signal, the other is an approximation signal. And in the detail signal, the start time and the end time of the sag signal can be detected. By applying an energy operator to the approximation signal, the temporary sag decline in value can be measured accurately and quickly. At the same time, the wavelet transform (WT) in this method acts like a filter. WT can weaken or remove the high frequency disturbance from voltage sag to enhance the noise immunity and accuracy of the energy operator. Simulation and experimental results verify the effectiveness of the algorithm.
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Received: 04 January 2011
Published: 07 March 2014
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2011, Vol. 26 
