Abstract
For economical reasons, wind turbine systems must be located in favourable sites generating a higher pro- ductivity. These are often located in areas with weak electric grid infrastructures. The constraints related to this type of grids limit the penetration levels of wind energy. These constraints are mainly related to power quality in the grid as well as the economical aspects of the project. In this study, we take into account the slow voltage variations and the flicker phenomenon. The models used are based on the development of a set of relations derived from engineering knowledge related to both technical and economical points of view. The maximal penetration level of a fixed speed wind turbine system is determined for a given grid. The power control has been investigated to improve wind turbine system integration. Obtained results show the necessity to adapt technological choices to the requirements of weaker grids. Penetration levels and wind turbine cost may be greatly improved using variable speed systems.
Highlights
The current institutional and technical evolutions in the field of electrical energy production schemes involve a substantial growth of distributed generation using wind turbine systems
For economical reasons the wind turbine systems must be implanted in more favourable windier sites which are often located in areas with weak electric grid infrastructures
All models are developed as a Constraint Satisfaction Problem (CSP) which is implemented on a digital CSP solver based on interval analysis to be solved [4]
Summary
The current institutional and technical evolutions in the field of electrical energy production schemes involve a substantial growth of distributed generation using wind turbine systems. The constraints related to this type of grids limit the penetration levels of wind energy These constraints are mainly those related to power quality in the connection node and to the economical aspects of the project. From a technical point of view, the power quality constraints related to the weak grid that may limit the penetration of wind energy depends on the characteristics of both the wind turbine and the grid, they are mainly [1,2]: Voltage variations: slow variations and fast variations known as flickers. The objective is to study the value added of reactive power control in improving the integration of wind turbines in weak grid conditions To reach this goal, the used models are based on the development of a set of relations derived from engineering knowledge related to both technical and economical points of view. All models are developed as a Constraint Satisfaction Problem (CSP) which is implemented on a digital CSP solver based on interval analysis to be solved [4]
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