Abstract
Wherever relief valves and other energy dissipation devices are installed to limit the pressure, water utility networks provide unexploited hydropower potentials. This is mainly due to a lack of economically viable technologies for energy recovery in the pico and micro hydropower range below 100 kW. Micro-turbine with counter-rotating runners proved suitable to harvest these potentials with limited investments and almost no environmental impact. An appropriate command strategy must therefore be applied to maximize the recovered energy.This paper deals with the construction of a Virtual Energy Recovery Station (VERS) model to simulate the energy recovery on a given installation site. It includes models of the turbine, of the water consumption and it allows to implement various command strategies. The VERS can serve various purposes. The fine tuning of the command algorithm for a specific installation site is demonstrated in the paper.
Highlights
In hilly or mountainous area, the difference of altitude between spring catching areas or fresh water reservoirs and water consumption areas sometimes impose to regulate the pressure in the consumption area
The concept of micro-turbine with counter-rotating runners pictured in Figure 2 and presented in depth in [2, 3] is a candidate for energy recovery on drinking water network, even for an available power in the range of 5 kW to 25 kW
The design of a system dedicated to energy recovery on existing infrastructure requires to consider typical constraints that are not experienced in the case of conventional hydropower infrastructures
Summary
In hilly or mountainous area, the difference of altitude between spring catching areas or fresh water reservoirs and water consumption areas sometimes impose to regulate the pressure in the consumption area. The concept of micro-turbine with counter-rotating runners pictured in Figure 2 and presented in depth in [2, 3] is a candidate for energy recovery on drinking water network, even for an available power in the range of 5 kW to 25 kW. First order MPPT Considering the output power as locally linear is a simple and straightforward approach to estimate its gradient.
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