Fuzzy-PID Control Of Frequency Conversion Pumping System

Fuel dispensers are the basic terminal equipments for oil allocation in the petrochemicalindustry, the physical essence of which is a hydraulical pumping and metering system be usedfor providing oil for kinetic energy at the cost of electrical energy consumption. According tostatistics of the International Energy Agency (IEA), the annual petroleum consumption inChina added up to22.52billion ton since2009, while85percent equivalent were assigned tomotor vehicle, eating up as much as20billion (KWH) electricity every year.The great powerloss problem in dispenser pumping system cannot be ignored, there will be active realisticsignificance and promising prospects to improve the efficiency of fuel dispenser for energysaving.From the math theory point of view, the substance of optimization on fuel dispenser isthe question to evaluate the extreme of multivariable function with the targets at lower energyconsumption and higher accuracy. An optimization scheme based on System Cybernetics wasworked out to improve the dynamic and static properties of fuel disperser, and thus reducingenergy loss and raising precision.1．The mathematics models were established by analyzing the principle of fuel dispenserand the entire components, laying down the foundation for system analysis and correction.2．Performance of fuel dispenser in both time and frequency domain were analyzedbased on Simulink software platform, considering "stability、rapidity、accuracy" as the qualityindexes, followed by pointing out the problem of unsatisfied dynamic response and steadyprecision existed in system.3．PID emendation based on decay curve method was simulated with the result ofpreliminary improvement in control performance of fuel dispenser. And then differentialforward PID correction and motor speed feedback approach were proved effective solutionsto overshooting and time delay problem.4．The control performance was further enhanced, benefited from the application ofFuzzy self-tuning PID emendation to fuel dispenser.Returning from Cybernetics to see in the physical perspective, the improvement insystem dynamic property means the lifting of efficiency, while in static it represent for theraise of precision. The former contributes to energy saving, the latter promotes socialdistribution fairness. Therefore the final conclusion is that the Fuzzy self tuning-PIDcorrection on fuel dispenser is necessary and of great significance.