Influence of data noise on online simulation of natural gas pipeline network
Data such as pressure,flow rate,temperature,and components measured in real time by supervisory control and data acquisition(SCADA)system are the key boundary conditions for online simulation of natural gas pipeline network,and noise and outliers are bound to exist in real-time data,thus affecting the accuracy of online simulation and operation stability.Therefore,the widely used implicit difference simulation model was taken as the analysis object.By considering the measuring accuracy of pressure gauges and flowmeters in the actual pipeline network system,Gaussian white noise was adopted to simulate different measured noise levels,and the influence of pressure noise and flow noise on the model convergence and simulation accuracy was analyzed.As a result,the different sensitivities of the implicit difference model to pressure and flow were clarified,and the filtering parameters of the online simulation model of the pipeline network were optimized.The results show that:①For the maximum relative error of simulation results caused by the single pressure noise of 0.5%,the flow rate is 63.41%,and the pressure is 0.15%;② for the maximum relative error of simulation results caused by the single flow noise of 1%,the flow rate is 0.11%,and the pressure is 0.07%;③ the simulation error caused by pressure noise is much larger than that caused by flow noise,and the simulation flow error is much larger than pressure;④ with the decrease in measuring accuracy,the simulation pressure and flow errors caused by noise increase gradually.The sensitivity of the implicit difference simulation model to the pressure parameter is higher than the flow parameter,and the small noise of the measured pressure will lead to serious simulation flow errors.Therefore,the filter processing of pressure boundary should be emphasized in online simulation,so as to effectively improve the simulation accuracy of the model.
natural gas pipeline networkonline simulationnonlinear systemboundary conditiondata noise
万方数据
维普
