The high penetration of renewable energy resources has made it harder to secure a flexible power system. Accordingly, this has become an issue in operating power systems. As a possible solution, pumped hydroelectric energy storage (PHES) has received much attention because of its fast start-up and ramp characteristics. This study proposes a flexibility-based reserve scheduling method for PHES. ...

In this paper, impacts of various uncertainties such as random outages of generating units and transmission lines, forecasting errors of load demand and wind power, in the presence of Demand response (DR) programs on power generation scheduling are studied. The problem is modelled in the form of a two-stage stochastic unit commitment (UC) which by solving it, the optimal solutions of UC as well...

This paper presents an algorithm for optimal resilient allocation of Mobile Energy Storage Systems (MESSs) active distribution system considering the microgrids coordinated bidding process. The main contribution this is that impacts biddings on MESSs in day-ahead and real-time markets are investigated. proposed optimization framework another decomposes process into multiple procedures horizons....

In power systems the next day’s power generation must be scheduled every day, day ahead short-term load forecasting (STLF) is a necessary daily task for power dispatch. Its accuracy affects the economic operation and reliability of the system greatly. Under prediction of STLF leads to insufficient reserve capacity preparation and in turn, increases the operating cost by using expensive peaking ...

The intermittent and uncontrollable power output from the ever-increasing renewable energy sources, require large amounts of operating reserves to retain system frequency within its nominal range. Based on day-ahead load forecasts, many research works have proposed conventional stochastic approaches define their optimum margins for reliability enhancement at reasonable production cost. In this ...

STUDY OBJECTIVE To evaluate the angiographic and coronary flow velocity parameters that best correlate with the results of stress myocardial perfusion imaging. DESIGN Criterion standard. SETTING Tertiary care center. PATIENTS Forty-eight patients undergoing diagnostic coronary angiography for angina or silent ischemia. INTERVENTIONS We performed angiographic and coronary flow velocity m...

Unit Commitment Problem (UCP) is a nonlinear mixed integer optimization problem used in the scheduling operation of power system generating units subjected to demand and reserve requirement constraints for achieving minimum operating cost. The task of the UC problem is to determine the on/off state of the generating units at every hour interval of the planning period for optimally transmitting ...

— In power systems the next day’s power generation must be scheduled every day, day ahead short-term load forecasting (STLF) is a necessary daily task for power dispatch. Its accuracy affects the economic operation and reliability of the system greatly. Under prediction of STLF leads to insufficient reserve capacity preparation and in turn, increases the operating cost by using expensive peakin...

Objective: To investigate the significance of intrafascial neurovascular bundle spare technique in radical cystectomy. Methods: Between March 2010 and December 2011, a total of 26 bladder cancer patients were treated with radical cystectomy, and intrafascial neurovascular bundle spare technique was applied in all these patients. Mean age of 26 patients was 56.1 y (45 66). Among 26 patients, 21 ...