Abstract
| Electronic variable-speed drives can produce large energy and environmental savings in variable-load variable-speed applications when compared with other conventional technologies. There are a very large number of applications which would benefit, both in terms of process improvement and energy savings, through the use of speed control. Previous studies have shown that the variable-flow fluid motion applications (pumps, fans, and compressors) have the largest savings potential. Combined application of inverters and water pumps brings us not only good energysaving benefits but some new problems, such as inverters configuration and overload etc. In systems with high static head the system curve does not follow the curves of constant efficiency. Using the Affinity Laws to calculate energy saving in system with static head is a mistake because it can also lead to major errors. From this element of uncertainty, the thought that we can try a fuzzy approach. This paper presents a theoretical study of use fuzzy logic to control the operation of a variable speed centrifugal pumps. A mathematical model has been realized and a Matlab simulation scheme was attached to it. Based on the mathmatical model of puming systems with or without static head, the article discusses some issues in detail, such as pressure and flow rate regulation. The fuzzy model can be successfully used for the variable speed control of hydraulic systems, whenthe Affinity Lows not observe exactly. |
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