Pumped hydro energy storage (PHES) is currently the only proven large-scale energy storage technology. Frequent changes between pump and turbine operations pose significant challenges in the design of a pump-turbine runner with high efficiency and stability, especially for ultrahigh-head reversible pump-turbine runners. In the present paper, a multiobjective optimization design system is used t...

The paper presents modeling the hydro-turbine governing system with delay in application to turbo-machinery control. originates from wave phenomenon encountered pressure water conduit connected turbine. To facilitate PID control tuning turbine and model is linearized it results linear time referred as neutral system. Particularly, disturbance rejection achieved by response varying power loads. ...

Renewable source based micro-generations such as wind and hydro offer the best potential for emission free power in future power systems. This paper investigates the technical issues related to stable and autonomous operation of a micro-grid system consisting of renewable power sources. A small hydro generation unit and a wind farm are the main renewable power generation units in the proposed m...

The main limitation of centrifugal pump running in turbine mode is lower efficiency at part load operating conditions as compared to conventional hydro turbines. To enhance the utilization of pump as turbine (PAT) in mini/micro hydropower plants, it is very important to improve its performance with some low cost modifications. The part load efficiency of PAT can be improved by guiding the flow ...

This paper implements models of two important distributed generators. The rst developed model describes and simulates the dynamic performance of a Single Shaft Micro Turbine, while the second model simulates the dynamic behavior of a Solid Oxide Fuel cell (SOFC). Increasing and reducing the power produced by these micro sources is also simulated. The two developed models can test the dynamic re...

Hydropower is the largest renewable energy source in the world. However, in the Columbia and Snake River basins, several species of Pacific salmon and steelhead have been listed for protection under the Endangered Species Act due to significant declines of fish population. Dam operators and design engineers are thus faced with the task of making hydroelectric facilities more fish friendly throu...

The growing demand for clean energy has led many engineers and scientists to find a way effectively generate distribute electricity without any carbon footprints. One of the most prominent widely known methods generating is Hydropower. leading researches in harvesting from low-head water sources through gravitational vortex turbine. Gravitational turbine special type micro-hydro that relies on ...

This paper investigates the critical stable sectional area (CSSA) of downstream surge tank (DST) hydropower plant with sloping ceiling tailrace tunnel (SCTT). Firstly, two types nonlinear mathematical model SCTT during transient process are established. Then, criterion operation stability is obtained based on theory. Formulae for CSSAs DST under derived. Finally, similarities, differences, and ...