Energy-saving optimization of urban drainage system based on pump performance

To reduce wastewater overflow and high power cost caused by unreasonably operating pump device in urban drainage system, a pump performance-based energy optimization strategy is proposed. A mathematical model is built based on the typical topological structure of urban drainage systems, and the calculation equations for sewerage inflow, outflow and storage condition of relevant pumping stations are established. Previous energy saving optimization algorithm regard pump efficiency as linear which limits the optimization result. To guarantee the energy saving effect, a nonlinear mathematical model of pump performance is constructed. According to the nonlinear relationships among pump flow, head and efficiency, total energy consumption in the next two time-domain is predicted. Energy consumption of the system can be reduced by optimizing the outflow of relevant pump stations dynamically. Comparing with traditional control methods of urban drainage system, the simulation results demonstrate that the proposed optimization algorithm can reduce system energy consumption as well as avoid wastewater overflow efficiently.