Energy management and control of island power systems with increased penetration from renewable sources

Abstract

International audiencePenetration of renewable energy sources in isolated and weakly interconnected power systems can be increased in a secure and reliable way, if advanced control tools are available to the operators of these systems. In this paper the functions of MORE CARE are described. This is an advanced control software system aiming to optimize the operation of isolated and weakly interconnected systems by increasing the share of wind energy and other renewable forms, taking into account pumped hydro storage facilities and providing advanced on-line security functions, both in preventive and corrective mode. The main features of the control system comprise advanced software modules for load and wind power forecasting, unit commitment and economic dispatch of the conventional and renewable units and on-line security assessment capabilities integrated in a friendly man-machine environment. In this way, penetration of renewable energy sources in isolated systems can be increased in a secure and reliable way. Pilot installations of advanced control functions are foreseen on the islands of Crete, Ireland and Madeira

Continuous optimal control approaches to microgrid energy management

“…The minimal and maximal power for the diesel generator are given by (6). The charging and discharging limits for the battery are stated in (7) and (8). The charging limit depends on the state of charge, and is therefore a mixed control-state constraint, as illustrated on Fig.…”

“…Furthermore, considering network constraints (load flow) adds another degree of complexity to the microgrid optimal energy management problem. To handle and solve these problem formulations, heuristic optimization techniques have been applied, including Genetic Algorithms (GA) [7], [8], PSO [7], and Ant Colony Optimization (ACO) [9]; the problem formulation has also been relaxed by incorporating the inequality constraints in the objective function using penalty factors. The minimization of total operating cost in stand-alone operation, and maximization of microgrids revenue in grid connected mode are two typically pursued objectives in secondary control.…”

Quantifying the Total Net Benefits of Grid Integrated Wind

“…Thus, for each hour, the commitment decisions are made 6 hours ahead of that hour and the dispatch decisions are made virtually at real time. This two stage approach, with commitment and dispatch taking account of wind power forecasts, has also been adopted in the Siemens PROMOD software, used in [8], and the two stage methodology is also employed in the MORE CARE control software, which is described in detail for an island system in [5], [9]. An alternative economic dispatch model which includes network constraints using genetic algorithms to dispatch an island system with wind is described in [45].…”

“…Wind is a relatively cheap form of renewable energy and can assist in the achievement of renewable energy and emissions reduction targets. However, wind generation is variable and relatively unpredictable and poses unique challenges for system operators and as such, the costs and benefits of wind generation are not clear cut and vary depending on the underlying system [1] [2] [3] [4] [5]. The purpose of doing a detailed investigation of costs and benefits of wind generation is to inform policy makers as to the appropriate quantity of wind generation to promote.…”

Fundamental study on stabilization of isolated island power system by use of pump system

“…If energy storage systems (ESSs) with enough power and energy capacity to suppress the power fluctuations are installed in the system, stable operation will be realized [1]. However, due to expense of ESSs, it is preferable to reduce their capacity.…”