Homologous coverage based stable control of chlorine concentration in water distribution systems

To control chlorine concentration stable in case of changeable hydraulic conditions with the method of input-output model, the situation that flow changed largely in water distribution systems was analyzed. The principle of homologous coverage and the expression that was to evaluate the influence of homologous coverage on node response matrix were proposed. The coverage region was decomposed into two regions named influenced region and reflowed region. Iteration was presented after analyzing the properties of output time series, and calculation procedures for stable control of chlorine concentration in water distribution systems were also proposed. After evaluating an example network, the method of setting boosters in reflowed region showed better control on single node, and the capacity of stable control could be improved when the ratio about operation time of tank and pump was reduced. Achieving coverage and dosing in reflowed region could obtain better stable control of chlorine concentration in water distribution systems.