Notice of Retraction Technical and Economic Assessment of Voltage Sag Based on Stochastic Prediction

The technical and economic assessment of voltage sag are analyzed in this paper, Specially, on one side, the sag conditions of customers are got by Monte Carlo prediction considering about randomness of sag event, on the other side, the equipment failure rate is counted by probability method due to the uncertain sensitivity and different tapes and the composition of sensitive equipment. Then the sag situation for customer can be evaluated using the date from both system and equipment. This paper adopts NPV to choose the most appropriate improvement plan which has a better balance between the technical effect and economic effect for specific customer. Finally, the method is applied to a manufacture plant. Taking into account the uncertain unit sag loss of customer, different section of best solution are also given. It has been convinced by the example that the assessment process is clear and easy to operate.