A New Measurement Model for Main Steam Flow of Power Plants

Accuracy of existing measurement models for main steam flow in power plants is always unsatisfied. In this paper, a model with higher accuracy for main steam flow measurement was proposed. Accurate values of main steam flow can be obtained based on principle of mass balance when unit is at a steady state. Because of volume sections such as cooling wall and super heater, this model isn’t suitable for dynamic-state unit. Another measuring model based on Flugel formula can give exact change trends of main steam flow when unit is at a dynamic state. However, its accuracy is unsatisfied. Therefore, this paper took advantages of the two models, fusing them together in frequency domain with complementary filter method. Simulation results show that new model not only gives accurate steam flow when unit is at a steady state but also provides exact change trends of main steam flow.