Abstract
Frequency regulation as a pump control method is an efficient method for pressure control in pressurised water supply systems, and consequently for water loss control and power consumption control. Operation of pumps with frequency regulation can be successfully simulated by means of mathematical modelling. The paper describes the basic principles of frequency regulation and analyses its control and operation in the free computer software EPANET. The developed auxiliary module VASPCALM automatically generates a number of pump operation controls for constant or proportional pressure value at the required model junction. The application of the module on the actual water supply system Velika Gorica (Croatia) proves that simple and efficient modelling of pump operation with frequency regulation in EPANET is possible, with an acceptable degree of accuracy. Also, the use of the VASPCALM module considerably facilitates the mathematical modelling of variable speed pumps in EPANET.
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