Simultaneous optimization of renewable energy based pumped storage scheme in energy and ancillary services market under deregulated power sector.

The power sector is experiencing comprehensive changes in its regulatory structure, sensing advancement and also prone to system security threats. To make the system more reliable the use of Ancillary Services (AS) become a must. The AS maintains the system security and reliability. With deregulation, the integration of Renewable Energy Sources (RES) in the power system has increased. To utilize RES at the maximum extent, the use of Energy Storage Systems (ESS) is required. ESS like Pumped Storage Plant (PSP) mainly adds great value to support renewable utilization. This paper proposes the simultaneous dispatch of energy and AS market such that the total procurement cost is minimized. The procurement of Operating Reserve (OR) as one of the principal AS is considered in the present work. The optimization problem is formulated and solved using Optimal Power Flow(OPF) technique. RES like Wind Power (WP) and Photo-Voltaic (PV), PSP as ESS with other conventional power generation units are considered to provide energy and AS. Four different cases considering various combinations of energy providers in the optimization problem have been studied and compared using modified IEEE-39 test bus system.